Hytera DMR Service Manual
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Hytera DMR Service Manual

Dmr mobile radio
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Table of Contents

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See also: Owner's Manual , Installation Manual
SERVICE MANUAL
DMR MOBILE RADIO
数 字 车 载 对 讲 机

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Summary of Contents for Hytera DMR

  • Page 1 SERVICE MANUAL DMR MOBILE RADIO 数 字 车 载 对 讲 机...
  • Page 2 Service Manual Preface This manual describes information related with product repair. To repair the product properly, please read this manual carefully. This manual is applicable to the following model: MD78X (X may indicate 2, 5, 6 or 8) MD78XG (X may indicate 2, 5, 6 or 8) Note: The description related to GPS is applicable to MD78XG only.
  • Page 3 Service Manual Contents Revision History ............................... 1 Copyright Information............................2 Disclaimer................................ 3 Product Overview ............................4 Product Controls .............................. 5 Front Panel ..............................7 Baseband Section............................. 9 7.1 Power Section ................................9 7.2 Power On/Off................................. 10 7.3 Clock ..................................11 7.4 Interface Distribution............................. 11 7.5 Audio Section ................................. 15 7.6 PCB Difference ............................... 19 GPS Circuit ..............................20 8.1 Circuit Description..............................
  • Page 4 Service Manual 11.8 Troubleshooting Flow Chart ..........................89 UHF1 (400‐470MHz 45W) Information ......................95 12.1 Transmitter Circuit ............................... 95 12.2 Receiver Circuit ..............................97 12.3 Frequency Generation Unit (FGU) ........................98 12.4 PCB View ................................101 12.5 Block Diagram ..............................105 12.6 Schematic Diagram ............................108 12.7 Parts List ................................122 12.8 Troubleshooting Flow Chart ..........................157 UHF2 (450‐520MHz 25W) Information...................... 163 13.1 Transmitter Circuit ............................. 163 13.2 Receiver Circuit ..............................165 13.3 Frequency Generation Unit (FGU) ........................
  • Page 5 Service Manual 15.4 PCB View ................................307 15.5 Block Diagram ..............................311 15.6 Schematic Diagram ............................314 15.7 Parts List ................................328 15.8 Troubleshooting Flow Chart ..........................364 UHF3 (350‐400MHz 45W) Information...................... 370 16.1 Transmitter Circuit ............................. 370 16.2 Receiver Circuit ..............................372 16.3 Frequency Generation Unit (FGU) ........................373 16.4 PCB View ................................376 16.5 Block Diagram ..............................380 16.6 Schematic Diagram ............................383 16.7 Parts List ................................397 16.8 Troubleshooting Flow Chart ..........................
  • Page 6 Service Manual Disassembly and Assembly........................579 Exploded View ............................582 Packing Guide ............................585 Specifications............................586...

  • Page 7: Revision History

    Service Manual 1. Revision History Version Date Description R2.0 09-2010 Initial Release R3.5 05-2011 Add descriptions on VHF, UHF2 and UHF3.

  • Page 8: Copyright Information

    Service Manual 2. Copyright Information Hytera is the trademark or registered trademark of Hytera Communications Co., Ltd. (the Company) in PRC and/or other countries or areas. The Company retains the ownership of its trademarks and product names. All other trademarks and/or product names that may be used in this manual are properties of their respective owners.

  • Page 9: Disclaimer

    No part of this manual may be copied, modified, translated, or distributed in any manner without the express written permission of us. If you have any suggestions or would like to learn more details, please visit our website at: http://www.hytera.com.

  • Page 10: Product Overview

    Service Manual 4. Product Overview Intended User This manual is intended for use by qualified technicians only.
  • Page 11 Service Manual 5. Product Controls Front Panel Part Name Part Name Volume Control / Cha nnel ○ ○ LED Indicator Selector Knob ○ ○ LCD Display OK/Menu Key ○ ○ Back Key Power On/Off Key ○ ○ Up Key Down Key ○...
  • Page 12 Service Manual Rear Panel Part Name Part Name ○ ○ RF Antenna Connector Power Inlet ○ ○ Accessory Jack GPS Antenna Connector Note: The GPS Antenna Connector is only available for MD78XG.

  • Page 13: Front Panel

    Service Manual 6. Front Panel The front panel contains the speaker, keys, power switch, volume control knob, LCD display and other parts. The block diagram is shown as the figure below. CONTROL HEAD Keys Matrix Back Switch Down Menu Keyboard Keyboard EMER 3*4 KEY...
  • Page 14 Service Manual and R6 respectively. The 5V voltage is converted to 3.3V by U5, in order to supply the LCD module. 4) LEDs and Backlight The LED enable signal is fed to the serial-to-parallel converter IC, and then is output by U302. RX status is indicated by green LED, and TX status by red LED.
  • Page 15 Service Manual 7. Baseband Section 7.1 Power Section Figure 7-1 Diagram of Power Distribution Both the baseband control IC and the RF section can convert the supplied voltage to an appropriate one via the voltage converter.  Supply for RF: U914, Q920 and Q921 supply power for the RF section by high current PNP transistor and comparator, which can work as LDO (Low Dropout Regulator).
  • Page 16 Service Manual 7.2 Power On/Off The mobile radio can be powered on/off through any of the following methods: Power On/Off key Ignition Signal Emergency 7.2.1 Power On/Off Key Power on the radio: As the Power On/Off Key is pressed, R944 becomes grounded and Q910 is on. Then Q905 outputs high-level signal, causing U902 and Q920 to start working.

  • Page 17: Clock

    Service Manual procedures are completed. 7.3 Clock Figure 7-2 Diagram of Clock Distribution 7.3.1 Input Clock The 32K clock provided by X375 is mainly used for timing and sleeping of the system. Its frequency (32.768 kHz) is divided by U302 (32768 times in all) to 1Hz for counting seconds. The system clock (19.2MHz) is generated by an external crystal oscillator.
  • Page 18 Service Manual Figure 7-4 Diagram of MCSI Interface When U302 is communicating with U100, it works in Master Mode with clock frequency of up to 9.6MHz. U100 uses MCSI synchronization as chip select signal and MCSI1.DOUT as data cable to configure its register.
  • Page 19 Service Manual Figure 7-6 Diagram of SSI Interface U302 has a total of three McBSP interfaces: McBSP1, McBSP2 and McBSP3, compatible with various interfaces. McBSP1 is connected with I2C of the audio processor, to realize two-way transmission of digital voice and data. McBSP2 uses independent clock and frame synchronization for transmitting and receiving.
  • Page 20 Service Manual Figure 7-8 Diagram of UART Interface U302 has a total of three UART interfaces, which are utilized to communicate with different external devices. UART2 is used for communication with front panel and serial port on PC, while UART3 with Option Board and accessory jack (USB).
  • Page 21 Service Manual Relative Voltage Signal Function Remarks (VDD=3.3V) Option Board GPIO5: output signal of the option board (reset); GPIO1 GPIO GPIO4 and GPIO5: GPIO2 GPIO uni-directional GPIO3 GPIO output interfaces. GPIO4 GPIO They require their GPIO5 RESET-OUT input resistance is above or equal to VIH MIN=0.7VDD 47KΩ.
  • Page 22 Service Manual 7.5 Audio Section Figure 7-9 Diagram of Audio Section 7.5.1 RX Audio Circuit U302 sends digital audio to the audio processor codec via the SSI bus of MCBSP1. This bus is composed of CLKX, FSX, DX and DR. It sends the demodulated PCM audio signal to the codec, and adjusts the signal to appropriate amplitude according to the volume (RMS should be 80mv when frequency is 1 KHz and deviation is 3 KHz).
  • Page 23 Service Manual external MIC is connected to the MIC_HED of the codec as a unit-directional input. Both MICs are controlled by Q232. When the internal MIC is active, EXT_MIC_EN is at low level, bias voltage of external MIC is disconnected, and the ADC in U231 senses voltage at the MICIN_HND. When the external MIC is active, EXT_MIC_EN is at high level, Q232 is turned on, bias voltage is connected, and the ADC in U231 senses only audio data at MICIN_HED.
  • Page 24 Service Manual 7.5.3 Troubleshooting Flow Chart for Control Circuit...
  • Page 25 Service Manual 7.6 PCB Difference The UHF1 PCB has three versions: D, F and H. The watchdog circuit (in the figure below) is added in version F. 3V3D U910 R932 /PRST1 4.7K D913 SENCE /PRST RSET MBRM120LT1G C937 1000p C941 0.15u D912 R920...

  • Page 26: Circuit Description

    Service Manual 8. GPS Circuit 8.1 Circuit Description Power Antenna UART OMAP module REB-1315LPx Figure 8-1 Diagram of GPS Circuit GPS positioning information can be acquired via the programmed GPS key on the front panel. The GPS function is realized via REB-1315LPx module, which integrates GPS baseband processor circuits. The GPS signal (1.57542GHz), received via the GPS active antenna (with a built-in LNA), goes to the GPS module for processing, and then enters U302 via the UART port.

  • Page 27: Parts List

    Service Manual 8.3 Parts List Ref.No Part Number Description R348 3001050000000 0Ω R349 3001053300010 33Ω R350 3001053300010 33Ω R365 3001051030000 10KΩ R366 3001051030000 10KΩ C325 3101051040010 0.1UF U326 3625999000030 GPS module W321 4411100002000 IPX RF connector R364 3001050000000 0Ω R363 3001050000000 0Ω...

  • Page 28: Troubleshooting Flow Chart

    Service Manual 8.4 Troubleshooting Flow Chart Replace the module. Antenna Replace the works Start antenna. normally? Peripheral Replace components work defective normally? components. The radio can position RX signal is normally? weak? Replace U901. Replace connector W321. The PC-based U901 outputs 3.3V software (e.g.SiRF Connector works normally?
  • Page 29 Service Manual 9. Tuning Description For details about radio tuning, please refer to the help file of DMR Tuner Software supplied by the Company.
  • Page 30 Service Manual 10. Interface Definition J404: to front panel jack Pin No. Name Function INT_MIC Audio input MIC_GROUND Audio input ground ACC_IO1 Accessory identifier pin 1 USB_VBUS USB power supply HOOK HOOK USB_D- USB data cable D- USB_D+ USB data cable D+ ACC_IO2 Accessory identifier pin 2 UART2_RXD_A...
  • Page 31 Service Manual PWB_IN Power-on/ power-off signal J4: to aviation jack of front panel Pin No. Name Function ACC_IO1 Digital input PTT_IN Digital input Handset_Audio Analog output USB_D- USB data cable Ground USB_VBUS Power supply MIC_IN Analog input USB_D+ USB data cable HOOK Hook signal input ACC_IO2...
  • Page 32 Service Manual RESET Reset signal Select data cable LEDA LED positive LED_K1 LED_K2 LED negative LED_K3 J403: to accessory pin jack Pin No. Name Function Vbus USB Power supply (+5V) Ground Ground GP5_3 Digital input/output SW B+ sense Power supply External Alarm Analog voltage output Power Ground...

  • Page 33: Transmitter Circuit

    Service Manual 11. UHF1 (400-470MHz 25W) Information 11.1 Transmitter Circuit The transmitter circuit is composed of power amplifier circuit and power control circuit. The former is used to amplify the VCO signal to the desired output power level, while the latter can keep the output power at the desired level, so as to protect the power amplifier from damage caused by over heat, antenna mismatch, and out-of-range voltage (over voltage or under voltage may result in damage to Q801, Q805, Q804, Q802 and Q803).
  • Page 34 Service Manual 11.1.4 Driver Power Amplifier The driver power amplifier is formed by Q804, with variable gain controlled by voltage VGG. The maximum output power is 38.5dBm, and the maximum variable gain is 11dB. 11.1.5 Final Power Amplifier The final power amplifier comprises Q802 and Q803, with the maximum output power of 48.5dBm, and the maximum variable gain of 10dB.

  • Page 35: Receiver Circuit

    Service Manual 11.1.9 Output Power Control The TX power is controlled by U801. The forward power is applied to the directional coupler, to output a voltage that can represent the forward power. The voltage together with the preset voltage feeds to U801 to output a voltage VGG, which can control both gate voltage and gain of Q804 and Q805, ensuring a constant power output.
  • Page 36 Service Manual electrically tunable band-pass filter to get useful signals. After passing through the RF band-pass filter and LNA (Q6102), the RF signals together with the first LO signal feed to the mixer for the first frequency conversion, to generate the first IF signal (73.35MHz). The mixer that employs the passive diode can ensure good dynamic range and port isolation.
  • Page 37 Service Manual The PLL synthesizer that consists of the reference oscillator (X100), PLL IC (U100) and VCO, is utilized to supply excitation signal source to the transmitter, and local oscillator signal to the receiver. 11.3.2 Reference Oscillator X100 is a 19.2MHz TCXO, and its reference frequency is calibrated by the digital-to-analog converter (U500) for accuracy.
  • Page 38 Service Manual oscillators. There are four VCOs in all: two VCOs (Q100 and Q103) used to transmit excitation signals and the other two VCOs (Q106 and Q110) to receive LO signals. U302 controls the operating frequency of the VCO. Q102 and Q107 constitute the buffer amplifiers for the transmitter circuit, while Q111 and Q109 for the receiver circuit.
  • Page 39 11.4 PCB View MD78X/MD78XG PCB View (Front Panel) Top Layer...
  • Page 40 MD78X/MD78XG PCB View (Front Panel) Bottom Layer...
  • Page 41 MD78X/MD78XG PCB View (Main Board) Top Layer...
  • Page 42 PCB View (Main Board) MD78X/MD78XG Bottom Layer...

  • Page 43: Block Diagram

    11.5 Block Diagram MD78X/MD78XG Block Diagram (Power Section) Auto baterry Voltage Q802\Q803\U201 13.6 Q804\Q805 9V3A 9V1A Q920\Q921\U914 Q801 Q801 Q6102 9V1A Q902 Q6103 U6000 U703 Q6105 U701 U702 U701 U915 4V3A Q100\Q103\Q106\Q110 Q104 U100 U918 3V3A X100 U905 U500 ON\OFF KEY PWB IGN_SENCE EMERGENCY U231...
  • Page 44 MD78X/MD78XG Block Diagram (RF Section) High Temperature Protection 9V1A_TX Gain:10 dB Gain:11dB Gain:15 dB Tx/Rx Gain:16 dB Switch Gain:-6 dB Tx_PORT Microstrip Attenuator Match Match Match Matcher Microstrip Dual Q804 Harmonic Q805 Q801 Rx_PORT Directional Coupler Driver Filter PreDriver Firststage Switch s Power 9.1V Q802 Q803...
  • Page 45 MD78X/MD78XG Block Diagram (BB Section) IF processor RF Unit BB Schematic Block Diagram TX RX CTL MCSI1 McBSP2 GPIOs TEMP_DET Audio Codec Nor FLASH and pSRAM Headset McBSP1 FLASH: 8Mx16 Driver datax16 pSRAM:2Mx16 TMS320C55x BELL Driver Speed:96MHz(max) Mobile SDRAM McBSP3 128Mb:8Mx16 JTAG JTAG...
  • Page 46 11.6 Schematic Diagram MD78X/MD78XG Schematic Diagram (Audio Circuit) R245 R245 EXT_SPKR+ R253 R253 EXT_SPKR- R293 R293 SPKR1+ R294 R294 SPKR1- L232 L232 BLM18PG300SN1 BLM18PG300SN1 9d3V C232 C232 C233 C233 0.1u 0.1u C285 C285 C284 C284 0.1u 0.1u C234 C234 C235 C235 10uF/25V 10uF/25V...
  • Page 47 MD78X/MD78XG Schematic Diagram (RX Circuit) L6100 L6100 BLM18PG600SN1 BLM18PG600SN1 9V1A_RX C6100 C6100 R6100 R6100 C6102 C6102 C6185 C6185 R6101 R6101 470p 470p R6102 R6102 TRANSISTOR TRANSISTOR L6101 L6101 Q6101 Q6101 BLM18PG600SN1 BLM18PG600SN1 TRANSISTOR TRANSISTOR RF_ATTEN C6103 C6103 220p 220p TX TP TX TP Q6100 Q6100...
  • Page 48 MD78X/MD78XG Schematic Diagram (DAC Circuit) L500 L500 BLM18PG600SN1 BLM18PG600SN1 C471 C471 C405 C405 0.1u 0.1u 10uF/10V 10uF/10V R570 R570 R542 0 R542 0 C484 C484 1000p 1000p C509 C509 C508 C508 C483 C483 C510 C510 R528 R528 8200p 8200p 0.1u 0.1u 100P 100P...
  • Page 49 MD78X/MD78XG Schematic Diagram (Memory Circuit) F_D0 R487 R487 F_D0_LCD F_D1 R489 R489 F_D1_LCD F_D2 R490 R490 F_D2_LCD F_D3 R492 R492 F_D3_LCD F_D4 R515 R515 F_D4_LCD F_D5 R516 R516 F_D5_LCD F_D6 R517 R517 F_D6_LCD F_D7 R518 R518 F_D7_LCD R519 R519 /OE_LCD R520 R520 /WE_LCD...
  • Page 50 MD78X/MD78XG Schematic Diagram (OMAP Circuit) 19.2_OMAP 3V3A R414 R414 R419 R419 C338 C338 C336 C336 C401 C401 0.1u 0.1u 10u/16V 10u/16V 1000p 1000p TP309 TP309 C364 39p C364 39p X302 X302 TP377 TP377 L151 L151 C337 C337 R426 R426 C375 C375 C376 C376...
  • Page 51 MD78X/MD78XG Schematic Diagram (OMAP & GPS Circuit) 3V3D TP326 TP326 R323 R323 R325 R325 U302B U302B OMAP OMAP 3V3D MPUIO2/SPIF.CS1/UWIRE.CS1 LCD.P0 U322 U322 R357 R357 98_PE MPUIO4/SPIF.CS2/UWIRE.CS2/LED2 LCD.P1 R329 R329 R330 R330 R327 R327 DVDD_IO SLC/SPC I2C_SCL 98_PC MPUIO1/SPIF.SCK LCD.P2 R324 R324 R334 10K...
  • Page 52 Peripheral Interface MD78X/MD78XG Schematic Diagram ( Circuit) 3V3D C482 C482 C481 C481 C409 C409 C410 C410 C411 C411 C412 C412 C413 C413 C414 C414 C415 C415 C416 C416 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p J400 J400 100p...
  • Page 53 MD78X/MD78XG Schematic Diagram 40-Pin Interface Circuit) SPK+ SPK+ 3V3D C468 C468 C439 C439 C438 C438 C441 C441 C440 C440 C435 C435 C420 C420 C419 C419 USB_VBUS R494 R494 R555 R555 100p 100p 0.47u 0.47u 0.47u 0.47u 100p 100p 100p 100p 100p 100p 100p...
  • Page 54 MD78X/MD78XG Schematic Diagram (Power Circuit) U900 U900 RP102N331B RP102N331B 3V3D TP4031 TP4031 VOUT TP4032 TP4032 C900 C900 C901 C901 B900 B900 MMBZ6V8ALT1G MMBZ6V8ALT1G D237 D237 U901 U901 C902 C902 D900 D900 RP102N331B RP102N331B 3V3DP TP4035 TP4035 C903 C903 470p/50V 470p/50V VOUT 470uF/25V 470uF/25V...
  • Page 55 MD78X/MD78XG Schematic Diagram (PLL Circuit) 5VA_FGU L156 L156 3.3UH 3.3UH R175 R175 0.1u 0.1u C1010 C1010 C1009 C1009 1000p 1000p 1000p 1000p 1u/16V 1u/16V 3V3A_FGU 601SN1 601SN1 601SN1 601SN1 0.01U 0.01U 0.1u 0.1u 601SN1 601SN1 C121 C121 100p 100p 0.1u 0.1u PLLLD PLLLD...
  • Page 56 MD78X/MD78XG Schematic Diagram (VCO Circuit) R153 R153 601SN1 601SN1 Q101 Q101 EMD22 EMD22 4V3A R142 R142 220p 220p 0.1u 0.1u 3.3k 3.3k 470n 470n R145 R145 TX_VCO_H 220p 220p C195 C195 C194 C194 R143 R143 220p 220p 0.1u 0.1u 6.8k 6.8k L103 L103...
  • Page 57 MD78X/MD78XG Schematic Diagram (IF Circuit) TP703 TP703 TP702 TP702 TP704 TP704 C701 C701 C703 C703 2FLO 2FLO 330n 330n 0.01u 0.01u TP701 TP701 IF-out L716 L716 C743 C743 TEST POINT TEST POINT C702 C702 0.01u 0.01u L701 L701 L702 L702 601S 601S L703...
  • Page 58 MD78X/MD78XG Schematic Diagram ( Circuit) C909 C909 C889 C889 C913 C913 C888 C888 C825 C825 C885 C885 L801 L801 C855 C855 47pF 47pF 470p 470p BLM41PG600SN1 BLM41PG600SN1 W801 W801 100p 100p 3300p 3300p 0.018uF 0.018uF 33pF 33pF C916 C916 C930 C930 C931 C931...
  • Page 59 MD78X/MD78XG Schematic Diagram (Front Panel) 3V3A TP10 TP10 TP11 TP11 TP12 TP12 TP13 TP13 TP14 TP14 TP15 TP15 TP16 TP16 TP17 TP17 MMBZ6V8ALT1G MMBZ6V8ALT1G 100pf 100pf MENU 100pf 100pf 0.1uf 0.1uf DOWN EMI FILTER EMI FILTER UART2_RXD LOGIC IC LOGIC IC PRST BACK UART2_TXD...
  • Page 60 Service Manual 11.7 Parts List Main Board for MD78X/MD78XG Ref. No. Part No. Description C6115 3001050000000 0Ω C6123 3001050000000 0Ω C6172 3001050000000 0Ω R127 3001050000000 0Ω R174 3001050000000 0Ω R188 3001050000000 0Ω R197 3001050000000 0Ω R230 3001050000000 0Ω R233 3001050000000 0Ω...
  • Page 61 Service Manual Ref. No. Part No. Description R888 3001050000000 0Ω R891 3001050000000 0Ω R894 3001050000000 0Ω R967 3001050000000 0Ω C241 3001060000000 0Ω C6158 3001060000000 0Ω C6176 3001060000000 0Ω C866 3001060000000 0Ω L823 3001060000000 0Ω R171 3001060000000 0Ω 3001060000000 0Ω R282 3001060000000 0Ω...
  • Page 62 Service Manual Ref. No. Part No. Description R175 3001051000000 10Ω R358 3001051000000 10Ω R360 3001051000000 10Ω R386 3001051000000 10Ω R388 3001051000000 10Ω R414 3001051000000 10Ω R456 3001051000000 10Ω R457 3001051000000 10Ω R808 3001061000000 10Ω R953 3001061000000 10Ω R6102 3001071000000 10Ω R878 3001081000000 10Ω...
  • Page 63 Service Manual Ref. No. Part No. Description R408 3001053300010 33Ω R409 3001053300010 33Ω R412 3001053300010 33Ω R413 3001053300010 33Ω R420 3001053300010 33Ω R423 3001053300010 33Ω R424 3001053300010 33Ω R425 3001053300010 33Ω R430 3001053300010 33Ω R431 3001053300010 33Ω R432 3001053300010 33Ω R433 3001053300010 33Ω...
  • Page 64 Service Manual Ref. No. Part No. Description R715 3001053300010 33Ω R717 3001053300010 33Ω R719 3001053300010 33Ω R720 3001053300010 33Ω R721 3001053300010 33Ω R725 3001053300010 33Ω R821 3001113300000 33Ω R825 3001113300000 33Ω R6117 3001063900000 39Ω 3001054700000 47Ω R141 3001054700000 47Ω R830 3001074700000 47Ω...
  • Page 65 Service Manual Ref. No. Part No. Description R410 3001051010040 100Ω R411 3001051010040 100Ω R421 3001051010040 100Ω R434 3001051010040 100Ω R439 3001051010040 100Ω R445 3001051010040 100Ω R458 3001051010040 100Ω R459 3001051010040 100Ω R556 3001051010040 100Ω R557 3001051010040 100Ω R929 3001051010040 100Ω R948 3001051010040 100Ω...
  • Page 66 Service Manual Ref. No. Part No. Description R852 3001064710000 470Ω R853 3001064710000 470Ω R935 3001064710000 470Ω R6100 3001055110000 510Ω R718 3001055110000 510Ω R912 3001055110000 510Ω R704 3001055610010 560Ω R6101 3001056810000 680Ω R6106 3001066810000 680Ω R936 3001066810000 680Ω R958 3001066810000 680Ω R887 3001058210000 820Ω...
  • Page 67 Service Manual Ref. No. Part No. Description R6110 3001051220000 1.2K R6119 3001051220000 1.2K R6122 3001051220000 1.2K R6131 3001051220000 1.2K R401 3001051520010 1.5K R951 3001051520010 1.5K R449 3001061520000 1.5K R265 3001051820000 1.8K R714 3001051820000 1.8K R703 3001052220010 2.2K R849 3001052220010 2.2K R866 3001052220010 2.2K...
  • Page 68 Service Manual Ref. No. Part No. Description R908 3001054720000 4.7K R910 3001054720000 4.7K R913 3001054720000 4.7K R937 3001054720000 4.7K R942 3001054720000 4.7K R925 3001064720000 4.7K R932 3001064720000 4.7K R880 3001074720010 4.7K R881 3001074720010 4.7K R6130 3001055120030 5.1K R839 3001053320000 5.6K R239 3001055620000 5.6K...
  • Page 69 Service Manual Ref. No. Part No. Description R340 3001051030000 10KΩ R341 3001051030000 10KΩ R342 3001051030000 10KΩ R343 3001051030000 10KΩ R351 3001051030000 10KΩ R353 3001051030000 10KΩ R372 3001051030000 10KΩ R373 3001051030000 10KΩ R377 3001051030000 10KΩ R378 3001051030000 10KΩ R379 3001051030000 10KΩ R382 3001051030000 10KΩ...
  • Page 70 Service Manual Ref. No. Part No. Description R512 3001051030000 10KΩ R530 3001051030000 10KΩ R531 3001051030000 10KΩ R532 3001051030000 10KΩ R534 3001051030000 10KΩ R535 3001051030000 10KΩ R538 3001051030000 10KΩ R539 3001051030000 10KΩ R540 3001051030000 10KΩ R541 3001051030000 10KΩ R543 3001051030000 10KΩ R555 3001051030000 10KΩ...
  • Page 71 Service Manual Ref. No. Part No. Description R940 3001052230010 22KΩ R944 3001052230010 22KΩ R273 3001052430010 24KΩ R915 3001052430010 24KΩ R952 3001062430000 24KΩ R6103 3001052730010 27KΩ R815 3001082730000 27KΩ R257 3001053030000 30KΩ R263 3001053030000 30KΩ R279 3001053030000 30KΩ R283 3001053030000 30KΩ R6134 3001053030000 30KΩ...
  • Page 72 Service Manual Ref. No. Part No. Description R934 3001055130010 51KΩ R237 3001055630000 56KΩ R241 3001055630000 56KΩ R6139 3001055630000 56KΩ R854 3001055630000 56KΩ R876 3001055630000 56KΩ R883 3001055630000 56KΩ R895 3001055630000 56KΩ R528 3001056830000 68KΩ R128 3001058230000 82KΩ R892 3001058230000 82KΩ R247 3001051040000 100K...
  • Page 73 Service Manual Ref. No. Part No. Description 3101050100030 C6117 3101050100030 C6120 3101050100030 C6121 3101050100030 C6124 3101050100030 C6126 3101050100030 C6153 3101050100030 3101050100030 C179 3101060100010 C821 3101080100010 C832 3101080100010 C101 3101051590000 1.5PF 3101051590000 1.5PF C6110 3101051590000 1.5PF C6119 3101051590000 1.5PF C6122 3101051590000 1.5PF C6127 3101051590000...
  • Page 74 Service Manual Ref. No. Part No. Description C166 3101050500010 C168 3101050500010 3101050500010 3101050500010 C6114 3101050500010 3101050500030 C164 3101050500030 C177 3101060500010 C830 3101080500010 C837 3101080500010 3101050600010 3101050600010 C6109 3101050600010 C6111 3101050600010 C6112 3101050600010 C6116 3101050600010 C731 3101050600010 L6111 3101060600010 C6163 3101050700010 3101060700020 C196 3101060700020...
  • Page 75 Service Manual Ref. No. Part No. Description C6161 3101051500020 15PF C6162 3101051500020 15PF C6164 3101051500020 15PF C6177 3101051500020 15PF C723 3101051500020 15PF 3101051500080 15PF C818 3101061500010 15PF L826 3101061600000 16PF C6129 3101051800010 18PF C724 3101051800010 18PF C158 3101051800070 18PF C162 3101051800070 18PF C191...
  • Page 76 Service Manual Ref. No. Part No. Description C6143 3101054700010 47PF C743 3101054700010 47PF C872 3101064700000 47PF C902 3101064700000 47PF L833 3101064700000 47PF R824 3101064700000 47PF C810 3101074700000 47PF C825 3101074700000 47PF C840 3101074700000 47PF C157 3101055600000 56PF C161 3101055600000 56PF C185 3101055600000 56PF...
  • Page 77 Service Manual Ref. No. Part No. Description C350 3101051010030 100PF C351 3101051010030 100PF C352 3101051010030 100PF C353 3101051010030 100PF C354 3101051010030 100PF C355 3101051010030 100PF C357 3101051010030 100PF C358 3101051010030 100PF C359 3101051010030 100PF C360 3101051010030 100PF C361 3101051010030 100PF C378 3101051010030 100PF...
  • Page 78 Service Manual Ref. No. Part No. Description C451 3101051010030 100PF C452 3101051010030 100PF C453 3101051010030 100PF C454 3101051010030 100PF C455 3101051010030 100PF C456 3101051010030 100PF C463 3101051010030 100PF C465 3101051010030 100PF C466 3101051010030 100PF C467 3101051010030 100PF C468 3101051010030 100PF C469 3101051010030 100PF...
  • Page 79 Service Manual Ref. No. Part No. Description C1000 3101052210010 220PF C147 3101052210010 220PF C150 3101052210010 220PF C156 3101052210010 220PF C160 3101052210010 220PF C184 3101052210010 220PF C186 3101052210010 220PF C194 3101052210010 220PF C197 3101052210010 220PF 3101052210010 220PF C247 3101052210010 220PF C250 3101052210010 220PF C254...
  • Page 80 Service Manual Ref. No. Part No. Description C896 3101052210010 220PF C897 3101052210010 220PF C898 3101052210010 220PF C921 3101052210010 220PF C242 3101062210000 220PF C245 3101062210000 220PF C808 3101062210000 220PF C809 3101062210000 220PF C822 3101062210000 220PF C845 3101062210000 220PF C853 3101062210000 220PF C877 3101062210000 220PF...
  • Page 81 Service Manual Ref. No. Part No. Description C1002 3101051020010 1000PF C1010 3101051020010 1000PF C337 3101051020010 1000PF C338 3101051020010 1000PF C513 3101051020010 1000PF 3101051020010 1000PF C6108 3101051020010 1000PF C710 3101051020010 1000PF C728 3101051020010 1000PF 3101051020010 1000PF 3101051020010 1000PF 3101051020010 1000PF C910 3101051020010 1000PF C937...
  • Page 82 Service Manual Ref. No. Part No. Description C736 3101051030020 0.01UF 3101051030020 0.01UF 3101051030020 0.01UF 3101051030020 0.01UF C952 3101061030010 0.01UF C913 3101061830000 0.018UF C930 3101061830000 0.018UF C246 3101052230000 0.022UF C880 3101064730000 0.047UF C122 3101065630000 0.056UF C894 3101051830000 0.1UF C1006 3101051040010 0.1UF C141 3101051040010 0.1UF...
  • Page 83 Service Manual Ref. No. Part No. Description 1009 C387 3101051040010 0.1UF 1010 C388 3101051040010 0.1UF 1011 C389 3101051040010 0.1UF 1012 C391 3101051040010 0.1UF 1013 C392 3101051040010 0.1UF 1014 C393 3101051040010 0.1UF 1015 C394 3101051040010 0.1UF 1016 C398 3101051040010 0.1UF 1017 C400 3101051040010 0.1UF...
  • Page 84 Service Manual Ref. No. Part No. Description 1053 3101051040010 0.1UF 1054 C947 3101051040010 0.1UF 1055 C950 3101051040010 0.1UF 1056 C955 3101051040010 0.1UF 1057 C958 3101051040010 0.1UF 1058 C967 3101051040010 0.1UF 1059 C968 3101051040010 0.1UF 1060 C969 3101051040010 0.1UF 1061 3101051040010 0.1UF 1062 C1016...
  • Page 85 Service Manual Ref. No. Part No. Description 1097 C941 3101062240050 0.22UF 1098 C438 3101054740000 0.47UF 1099 C439 3101054740000 0.47UF 1100 C287 3101064740000 0.47UF 1101 C715 3101064740000 0.47UF 1102 C255 3101051050000 1103 C276 3101051050000 1104 C305 3101051050000 1105 C310 3101051050000 1106 C719 3101051050000 1107...
  • Page 86 Service Manual Ref. No. Part No. Description 1141 C906 3101061050020 1142 C908 3101061050020 1143 C923 3101061050020 1144 C924 3101061050020 1145 C925 3101061050020 1146 C938 3101061050020 1147 C946 3101061050020 1148 C966 3101061050020 1149 C750 3101071050020 1150 C1009 3104071050070 1151 3104071050070 1152 C920 3101062250000 2.2UF...
  • Page 87 Service Manual Ref. No. Part No. Description 1185 C933 3101092260010 22UF 1186 C284 3103994760180 47uf 1187 C804 3103994760180 47uf 1188 C914 3103994760180 47uf 1189 L814 3212106569000 5.6nH 1190 L105 3237199080000 1191 L114 3237199080000 1192 L811 3217106829010 8.2nH 1193 C6194 3212106100000 10nH 1194 L6103...
  • Page 88 Service Manual Ref. No. Part No. Description 1229 L716 3210406331000 330nH 1230 L147 3210406471000 470nH 1231 L151 3210406471000 470nH 1232 L718 3210406471000 470nH 1233 L103 3217607471000 470nH 1234 L107 3217607471000 470nH 1235 L108 3217607471000 470nH 1236 L110 3217607471000 470nH 1237 L112 3217607471000 470nH...
  • Page 89 Service Manual Ref. No. Part No. Description 1273 R153 3221506601000 Bead 1274 R157 3221506601000 Bead 1275 R179 3221506601000 Bead 1276 R186 3221506601000 Bead 1277 L801 3221513600000 Bead 1278 L802 3221513600000 Bead 1279 L803 3221513600000 Bead 1280 L900 3221513600000 Bead 1281 L916 3221513600000 Bead...
  • Page 90 Service Manual Ref. No. Part No. Description 1317 L807 3210306101000 100nH 1318 L806 3213306102000 1319 L820 3217112102020 1320 L828 3217112102020 1321 3213212332000 3.3uH 1322 L156 3213212332000 3.3uH 1323 L715 3213212332000 3.3uH 1324 L717 3212206682000 6.8uH 1325 L903 3213099472000 4.7uH 1326 L931 3213099472000 4.7uH...
  • Page 91 Service Manual Ref. No. Part No. Description 1361 D234 3310240200000 ESD protection diode 1362 D236 3310240200000 ESD protection diode 1363 D239 3310240200000 ESD protection diode 1364 D235 3302031100010 Zener diode 1365 D409 3310240000040 ESD protection diode 1366 D237 3310990000090 ESD protection diode 1367 D238 3310990000090...
  • Page 92 Service Manual Ref. No. Part No. Description 1405 Q112 3403999000000 Transistor 1406 Q116 3403999000000 Transistor 1407 Q117 3403999000000 Transistor 1408 Q102 3401002000990 NPN transistor 1409 Q111 3401002000990 NPN transistor 1410 Q104 3403003000060 NPN transistor 1411 Q702 3403003000060 NPN transistor 1412 Q107 3404006000000 NPN transistor...
  • Page 93 Service Manual Ref. No. Part No. Description 1449 Q6102 3404999000000 NPN transistor 1450 Q6103 3404999000000 NPN transistor 1451 Q801 3404999000000 NPN transistor 1452 Q804 3504990000030 MOSFET 1453 Q805 3504990000010 MOSFET 1454 Q810 3403002000000 PNP transistor 1455 Q902 3403002000000 PNP transistor 1456 Q906 3414001000020...
  • Page 94 Service Manual Ref. No. Part No. Description 1493 U917 3609006003050 Reset IC 1494 X100 3701019250030 TCXO (19.2MHz) 1495 X302 3701019250040 Temperature compensated crystal oscillator(19.2MHz) 1496 X375 3701327610060 Crystal 1497 F900 4099000000050 Fuse 1498 J400 5201020000020 Connector 1499 J404 5206040200010 FFC connector 1500 41MD7801000F0 PCB 1501...
  • Page 95 Service Manual 11.8 Troubleshooting Flow Chart Receiver Circuit...
  • Page 96 Service Manual Description of Normal Situations: [1] During sensitivity test, use a communication test set to demodulate the audio signal (TP4012 and TP4016). If the signal is demodulated normally, it is concluded that the front panel is defective. [2] Use the communication test set to input a 73.35MHz IF signal at the mixer, and see whether it can be processed normally afterwards.
  • Page 97 Service Manual Transmitter Circuit...
  • Page 98 Service Manual Description of Normal Situations: [1] The current in analog mode is above 6A under 45W power supply and above 1A under 5W. However, in digital mode, the current will be reduced by 50%. [2] The APC voltage should be above 2V at TP811. [3] Check whether there is an appropriate TX LO signal at TP803.
  • Page 99 Service Manual...
  • Page 100 Service Manual Description of Normal Situations: [1] Detect the oscillation frequency of RX TP123 and TX TP111 using a spectrum analyzer. [2] Check whether switches (Q108, Q112, Q101 and Q105) are turned on and output 3.6V. [3] Check whether the emitter voltage of the four transistors (Q106, Q110, Q100 and Q103) is about 1.8V under normal RX/TX status.
  • Page 101 Service Manual 12. UHF1 (400-470MHz 45W) Information 12.1 Transmitter Circuit The transmitter circuit is composed of power amplifier circuit and power control circuit. The former is used to amplify the VCO signal to the desired output power level, while the latter can keep the output power at the desired level, so as to protect the power amplifier from damage caused by over heat, antenna mismatch, and out-of-range voltage (over voltage or under voltage may result in damage to Q801, Q805, Q804, Q802 and Q803).
  • Page 102 Service Manual maximum output power is 38.5dBm, and the maximum variable gain is 11dB. 12.1.5 Final Power Amplifier The final power amplifier comprises Q802 and Q803, with the maximum output power of 48.5dBm, and the maximum variable gain of 10dB. The input matching circuit is composed of C815, C839, R804, R806, R807, R813, R818 and R861, while the power combining circuit is composed of C820, C8330, C831, C819, C812, C841 and C842.
  • Page 103 Service Manual The circuit consists of thermistor RT804 and resistor R884. The output voltage is proportional to the detected temperature. Both the voltage used for temperature detection and the threshold voltage are fed into the operational amplifier U803, to output a voltage signal that is in proportion to the detected temperature.
  • Page 104 Service Manual Figure 12-3 Diagram of IF Processor The first IF signal (73.35MHz) output by the IF amplifier goes into IF IC via Pin 47, where the signal is converted to the second IF signal (2.25MHz). Then the un-demodulated digital I/Q signal output from the SSI interface is sent to U302 for demodulation.
  • Page 105 Service Manual Figure 12-4 Diagram of PLL IC The 19.2MHz frequency generated by the reference oscillator goes into the PLL IC for division, generating the reference frequency. Meanwhile, the frequency generated by VCO goes into PLL IC (U100) for frequency division. The resulting frequency will be compared with the reference frequency in terms of phase difference in the phase detector.
  • Page 106 Service Manual TX_L_VCO Q103 TX PA Q102 Q107 Q100 TX_H_VCO PLL IC （U100） RX_L_VCO Q110 RX Lo Q109 Q111 Q106 RX_H_VCO Figure 12-5 Diagram of VCO...
  • Page 107 12.4 PCB View MD78X/MD78XG PCB View (Front Panel) Top Layer...
  • Page 108 MD78X/MD78XG PCB View (Front Panel) Bottom Layer...
  • Page 109 MD78X/MD78XG PCB View (Main Board) Top Layer...
  • Page 110 PCB View (Main Board) MD78X/MD78XG Bottom Layer...
  • Page 111 12.5 Block Diagram MD78X/MD78XG Block Diagram (Power Section) Auto baterry Voltage Q802\Q803\U201 13.6 Q804\Q805 9V3A 9V1A Q920\Q921\U914 Q801 Q801 Q6102 9V1A Q902 Q6103 U6000 U703 Q6105 U701 U702 U701 U915 4V3A Q104 Q100\Q103\Q106\Q110 U100 U918 3V3A X100 U905 U500 ON\OFF KEY PWB IGN_SENCE U231 EMERGENCY...
  • Page 112 MD78X/MD78XG Block Diagram (RF Section) High Temperature Protection 9V1A_TX Gain:10 dB Gain:11dB Gain:15 dB Tx/Rx Gain:16 dB Switch Gain:-6 dB Tx_PORT Microstrip Attenuator Match Match Match Matcher Microstrip Dual Q804 Harmonic Q805 Q801 Rx_PORT Directional Coupler Driver Filter PreDriver Firststage Switch s Power 9.1V Q802 Q803...
  • Page 113 MD78X/MD78XG Block Diagram (BB Section) IF processor RF Unit BB Schematic Block Diagram TX RX CTL MCSI1 McBSP2 GPIOs TEMP_DET Audio Codec Nor FLASH and pSRAM Headset McBSP1 FLASH: 8Mx16 Driver datax16 pSRAM:2Mx16 TMS320C55x BELL Driver Speed:96MHz(max) Mobile SDRAM McBSP3 128Mb:8Mx16 JTAG JTAG...
  • Page 114 12.6 Schematic Diagram MD78X/MD78XG Schematic Diagram (Audio Circuit) R245 R245 EXT_SPKR+ R253 R253 EXT_SPKR- R293 R293 SPKR1+ R294 R294 SPKR1- L232 L232 BLM18PG300SN1 BLM18PG300SN1 9d3V C232 C232 C233 C233 0.1u 0.1u C285 C285 C284 C284 0.1u 0.1u C234 C234 C235 C235 10uF/25V 10uF/25V...
  • Page 115 MD78X/MD78XG Schematic Diagram (RX Circuit) L6100 L6100 BLM18PG600SN1 BLM18PG600SN1 9V1A_RX C6100 C6100 R6100 R6100 C6102 C6102 C6185 C6185 R6101 R6101 470p 470p R6102 R6102 TRANSISTOR TRANSISTOR L6101 L6101 Q6101 Q6101 BLM18PG600SN1 BLM18PG600SN1 TRANSISTOR TRANSISTOR RF_ATTEN C6103 C6103 220p 220p TX TP TX TP Q6100 Q6100...
  • Page 116 MD78X/MD78XG Schematic Diagram (DAC Circuit) L500 L500 BLM18PG600SN1 BLM18PG600SN1 C471 C471 C405 C405 0.1u 0.1u 10uF/10V 10uF/10V R570 R570 R542 0 R542 0 C484 C484 1000p 1000p C509 C509 C508 C508 C483 C483 C510 C510 R528 R528 8200p 8200p 0.1u 0.1u 100P 100P...
  • Page 117 MD78X/MD78XG Schematic Diagram (Memory Circuit) F_D0 R487 R487 F_D0_LCD F_D1 R489 R489 F_D1_LCD F_D2 R490 R490 F_D2_LCD F_D3 R492 R492 F_D3_LCD F_D4 R515 R515 F_D4_LCD F_D5 R516 R516 F_D5_LCD F_D6 R517 R517 F_D6_LCD F_D7 R518 R518 F_D7_LCD R519 R519 /OE_LCD R520 R520 /WE_LCD...
  • Page 118 MD78X/MD78XG Schematic Diagram (OMAP Circuit) 19.2_OMAP 3V3A R414 R414 R419 R419 C338 C338 C336 C336 C401 C401 0.1u 0.1u 10u/16V 10u/16V 1000p 1000p TP309 TP309 C364 39p C364 39p X302 X302 TP377 TP377 L151 L151 C337 C337 R426 R426 C375 C375 C376 C376...
  • Page 119 MD78X/MD78XG Schematic Diagram (OMAP & GPS Circuit) 3V3D TP326 TP326 R323 R323 R325 R325 U302B U302B OMAP OMAP 3V3D MPUIO2/SPIF.CS1/UWIRE.CS1 LCD.P0 U322 U322 R357 R357 98_PE MPUIO4/SPIF.CS2/UWIRE.CS2/LED2 LCD.P1 R329 R329 R330 R330 R327 R327 DVDD_IO SLC/SPC I2C_SCL 98_PC MPUIO1/SPIF.SCK LCD.P2 R324 R324 R334 10K...
  • Page 120 Peripheral Interface MD78X/MD78XG Schematic Diagram ( Circuit) 3V3D C482 C482 C481 C481 C409 C409 C410 C410 C411 C411 C412 C412 C413 C413 C414 C414 C415 C415 C416 C416 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p J400 J400 100p...
  • Page 121 MD78X/MD78XG Schematic Diagram 40-Pin Interface Circuit) SPK+ SPK+ 3V3D C468 C468 C439 C439 C438 C438 C441 C441 C440 C440 C435 C435 C420 C420 C419 C419 USB_VBUS R494 R494 R555 R555 100p 100p 0.47u 0.47u 0.47u 0.47u 100p 100p 100p 100p 100p 100p 100p...
  • Page 122 MD78X/MD78XG Schematic Diagram (Power Circuit) U900 U900 RP102N331B RP102N331B 3V3D TP4031 TP4031 VOUT TP4032 TP4032 C900 C900 C901 C901 B900 B900 MMBZ6V8ALT1G MMBZ6V8ALT1G D237 D237 U901 U901 C902 C902 D900 D900 RP102N331B RP102N331B 3V3DP TP4035 TP4035 C903 C903 470p/50V 470p/50V VOUT 470uF/25V 470uF/25V...
  • Page 123 MD78X/MD78XG Schematic Diagram (PLL Circuit) 5VA_FGU L156 L156 3.3UH 3.3UH R175 R175 0.1u 0.1u C1010 C1010 C1009 C1009 1000p 1000p 1000p 1000p 1u/16V 1u/16V 3V3A_FGU 601SN1 601SN1 601SN1 601SN1 0.01U 0.01U 0.1u 0.1u 601SN1 601SN1 C121 C121 100p 100p 0.1u 0.1u PLLLD PLLLD...
  • Page 124 MD78X/MD78XG Schematic Diagram (VCO Circuit) R153 R153 601SN1 601SN1 Q101 Q101 EMD22 EMD22 4V3A R142 R142 220p 220p 0.1u 0.1u 3.3k 3.3k 470n 470n R145 R145 TX_VCO_H 220p 220p C195 C195 C194 C194 R143 R143 220p 220p 0.1u 0.1u 6.8k 6.8k L103 L103...
  • Page 125 MD78X/MD78XG Schematic Diagram (IF Circuit) TP703 TP703 TP702 TP702 TP704 TP704 C701 C701 C703 C703 2FLO 2FLO 330n 330n 0.01u 0.01u TP701 TP701 IF-out L716 L716 C743 C743 TEST POINT TEST POINT C702 C702 0.01u 0.01u L701 L701 L702 L702 601S 601S L703...
  • Page 126 MD78X/MD78XG Schematic Diagram ( Circuit) C909 C909 C889 C889 C913 C913 C888 C888 C825 C825 C885 C885 L801 L801 C855 C855 47pF 47pF 470p 470p BLM41PG600SN1 BLM41PG600SN1 W801 W801 100p 100p 3300p 3300p 0.018uF 0.018uF 33pF 33pF C916 C916 C930 C930 C931 C931...
  • Page 127 MD78X/MD78XG Schematic Diagram (Front Panel) 3V3A TP10 TP10 TP11 TP11 TP12 TP12 TP13 TP13 TP14 TP14 TP15 TP15 TP16 TP16 TP17 TP17 MMBZ6V8ALT1G MMBZ6V8ALT1G 100pf 100pf MENU 100pf 100pf 0.1uf 0.1uf DOWN EMI FILTER EMI FILTER UART2_RXD LOGIC IC LOGIC IC PRST BACK UART2_TXD...
  • Page 128 Service Manual 12.7 Parts List Main Board for MD78X/MD78XG Ref. No. Part No. Description C6115 3001050000000 0Ω C6123 3001050000000 0Ω C6172 3001050000000 0Ω R127 3001050000000 0Ω R174 3001050000000 0Ω R188 3001050000000 0Ω R197 3001050000000 0Ω R230 3001050000000 0Ω R233 3001050000000 0Ω...
  • Page 129 Service Manual Ref. No. Part No. Description R891 3001050000000 0Ω R894 3001050000000 0Ω R967 3001050000000 0Ω C241 3001060000000 0Ω C6158 3001060000000 0Ω C6176 3001060000000 0Ω C866 3001060000000 0Ω L823 3001060000000 0Ω R171 3001060000000 0Ω 3001060000000 0Ω R282 3001060000000 0Ω R405 3001060000000 0Ω...
  • Page 130 Service Manual Ref. No. Part No. Description R358 3001051000000 10Ω R360 3001051000000 10Ω R386 3001051000000 10Ω R388 3001051000000 10Ω R414 3001051000000 10Ω R456 3001051000000 10Ω R457 3001051000000 10Ω R808 3001061000000 10Ω R953 3001061000000 10Ω R6102 3001071000000 10Ω R878 3001081000000 10Ω R122 3001052700010 27Ω...
  • Page 131 Service Manual Ref. No. Part No. Description R409 3001053300010 33Ω R412 3001053300010 33Ω R413 3001053300010 33Ω R420 3001053300010 33Ω R423 3001053300010 33Ω R424 3001053300010 33Ω R425 3001053300010 33Ω R430 3001053300010 33Ω R431 3001053300010 33Ω R432 3001053300010 33Ω R433 3001053300010 33Ω R467 3001053300010 33Ω...
  • Page 132 Service Manual Ref. No. Part No. Description R717 3001053300010 33Ω R719 3001053300010 33Ω R720 3001053300010 33Ω R721 3001053300010 33Ω R725 3001053300010 33Ω R821 3001113300000 33Ω R825 3001113300000 33Ω R6117 3001063900000 39Ω 3001054700000 47Ω R141 3001054700000 47Ω R830 3001074700000 47Ω R6120 3001055100010 51Ω...
  • Page 133 Service Manual Ref. No. Part No. Description R411 3001051010040 100Ω R421 3001051010040 100Ω R434 3001051010040 100Ω R439 3001051010040 100Ω R445 3001051010040 100Ω R458 3001051010040 100Ω R459 3001051010040 100Ω R556 3001051010040 100Ω R557 3001051010040 100Ω R929 3001051010040 100Ω R948 3001051010040 100Ω R111 3001061010000 100Ω...
  • Page 134 Service Manual Ref. No. Part No. Description R853 3001064710000 470Ω R935 3001064710000 470Ω R6100 3001055110000 510Ω R718 3001055110000 510Ω R912 3001055110000 510Ω R704 3001055610010 560Ω R6101 3001056810000 680Ω R6106 3001066810000 680Ω R936 3001066810000 680Ω R958 3001066810000 680Ω R887 3001058210000 820Ω R181 3001051020000 1KΩ...
  • Page 135 Service Manual Ref. No. Part No. Description R6119 3001051220000 1.2K R6122 3001051220000 1.2K R6131 3001051220000 1.2K R401 3001051520010 1.5K R951 3001051520010 1.5K R449 3001061520000 1.5K R265 3001051820000 1.8K R714 3001051820000 1.8K R703 3001052220010 2.2K R849 3001052220010 2.2K R866 3001052220010 2.2K R909 3001052220010 2.2K...
  • Page 136 Service Manual Ref. No. Part No. Description R910 3001054720000 4.7K R913 3001054720000 4.7K R937 3001054720000 4.7K R942 3001054720000 4.7K R925 3001064720000 4.7K R932 3001064720000 4.7K R880 3001074720010 4.7K R881 3001074720010 4.7K R6130 3001055120030 5.1K R839 3001053320000 5.6K R239 3001055620000 5.6K R287 3001055620000 5.6K...
  • Page 137 Service Manual Ref. No. Part No. Description R341 3001051030000 10KΩ R342 3001051030000 10KΩ R343 3001051030000 10KΩ R351 3001051030000 10KΩ R353 3001051030000 10KΩ R372 3001051030000 10KΩ R373 3001051030000 10KΩ R377 3001051030000 10KΩ R378 3001051030000 10KΩ R379 3001051030000 10KΩ R382 3001051030000 10KΩ R385 3001051030000 10KΩ...
  • Page 138 Service Manual Ref. No. Part No. Description R530 3001051030000 10KΩ R531 3001051030000 10KΩ R532 3001051030000 10KΩ R534 3001051030000 10KΩ R535 3001051030000 10KΩ R538 3001051030000 10KΩ R539 3001051030000 10KΩ R540 3001051030000 10KΩ R541 3001051030000 10KΩ R543 3001051030000 10KΩ R555 3001051030000 10KΩ R705 3001051030000 10KΩ...
  • Page 139 Service Manual Ref. No. Part No. Description R944 3001052230010 22KΩ R273 3001052430010 24KΩ R915 3001052430010 24KΩ R952 3001062430000 24KΩ R6103 3001052730010 27KΩ R815 3001082730000 27KΩ R257 3001053030000 30KΩ R263 3001053030000 30KΩ R279 3001053030000 30KΩ R283 3001053030000 30KΩ R6134 3001053030000 30KΩ R6137 3001053030000 30KΩ...
  • Page 140 Service Manual Ref. No. Part No. Description R237 3001055630000 56KΩ R241 3001055630000 56KΩ R6139 3001055630000 56KΩ R854 3001055630000 56KΩ R876 3001055630000 56KΩ R883 3001055630000 56KΩ R895 3001055630000 56KΩ R528 3001056830000 68KΩ R128 3001058230000 82KΩ R892 3001058230000 82KΩ R247 3001051040000 100K R248 3001051040000 100K...
  • Page 141 Service Manual Ref. No. Part No. Description C6117 3101050100030 C6120 3101050100030 C6121 3101050100030 C6124 3101050100030 C6126 3101050100030 C6153 3101050100030 3101050100030 C179 3101060100010 C821 3101080100010 C832 3101080100010 C101 3101051590000 1.5PF 3101051590000 1.5PF C6110 3101051590000 1.5PF C6119 3101051590000 1.5PF C6122 3101051590000 1.5PF C6127 3101051590000 1.5PF...
  • Page 142 Service Manual Ref. No. Part No. Description C168 3101050500010 3101050500010 3101050500010 C6114 3101050500010 3101050500030 C164 3101050500030 C177 3101060500010 C830 3101080500010 C837 3101080500010 3101050600010 3101050600010 C6109 3101050600010 C6111 3101050600010 C6112 3101050600010 C6116 3101050600010 C731 3101050600010 L6111 3101060600010 C6163 3101050700010 3101060700020 C196 3101060700020 3101050800000 C819...
  • Page 143 Service Manual Ref. No. Part No. Description C6162 3101051500020 15PF C6164 3101051500020 15PF C6177 3101051500020 15PF C723 3101051500020 15PF 3101051500080 15PF C818 3101061500010 15PF L826 3101061600000 16PF C6129 3101051800010 18PF C724 3101051800010 18PF C158 3101051800070 18PF C162 3101051800070 18PF C191 3101051800070 18PF C6128...
  • Page 144 Service Manual Ref. No. Part No. Description C743 3101054700010 47PF C872 3101064700000 47PF C902 3101064700000 47PF L833 3101064700000 47PF R824 3101064700000 47PF C810 3101074700000 47PF C825 3101074700000 47PF C840 3101074700000 47PF C157 3101055600000 56PF C161 3101055600000 56PF C185 3101055600000 56PF C6134 3101055600000 56PF...
  • Page 145 Service Manual Ref. No. Part No. Description C351 3101051010030 100PF C352 3101051010030 100PF C353 3101051010030 100PF C354 3101051010030 100PF C355 3101051010030 100PF C357 3101051010030 100PF C358 3101051010030 100PF C359 3101051010030 100PF C360 3101051010030 100PF C361 3101051010030 100PF C378 3101051010030 100PF C385 3101051010030 100PF...
  • Page 146 Service Manual Ref. No. Part No. Description C452 3101051010030 100PF C453 3101051010030 100PF C454 3101051010030 100PF C455 3101051010030 100PF C456 3101051010030 100PF C463 3101051010030 100PF C465 3101051010030 100PF C466 3101051010030 100PF C467 3101051010030 100PF C468 3101051010030 100PF C469 3101051010030 100PF C470 3101051010030 100PF...
  • Page 147 Service Manual Ref. No. Part No. Description C147 3101052210010 220PF C150 3101052210010 220PF C156 3101052210010 220PF C160 3101052210010 220PF C184 3101052210010 220PF C186 3101052210010 220PF C194 3101052210010 220PF C197 3101052210010 220PF 3101052210010 220PF C247 3101052210010 220PF C250 3101052210010 220PF C254 3101052210010 220PF C265...
  • Page 148 Service Manual Ref. No. Part No. Description C897 3101052210010 220PF C898 3101052210010 220PF C921 3101052210010 220PF C242 3101062210000 220PF C245 3101062210000 220PF C808 3101062210000 220PF C809 3101062210000 220PF C822 3101062210000 220PF C845 3101062210000 220PF C853 3101062210000 220PF C877 3101062210000 220PF C878 3101062210000 220PF...
  • Page 149 Service Manual Ref. No. Part No. Description C1010 3101051020010 1000PF C337 3101051020010 1000PF C338 3101051020010 1000PF C513 3101051020010 1000PF 3101051020010 1000PF C6108 3101051020010 1000PF C710 3101051020010 1000PF C728 3101051020010 1000PF 3101051020010 1000PF 3101051020010 1000PF 3101051020010 1000PF C910 3101051020010 1000PF C937 3101051020010 1000PF C944...
  • Page 150 Service Manual Ref. No. Part No. Description 3101051030020 0.01UF 3101051030020 0.01UF 3101051030020 0.01UF C952 3101061030010 0.01UF C913 3101061830000 0.018UF C930 3101061830000 0.018UF C246 3101052230000 0.022UF C880 3101064730000 0.047UF C122 3101065630000 0.056UF C894 3101051830000 0.1UF C1006 3101051040010 0.1UF C141 3101051040010 0.1UF C149 3101051040010 0.1UF...
  • Page 151 Service Manual Ref. No. Part No. Description 1010 C388 3101051040010 0.1UF 1011 C389 3101051040010 0.1UF 1012 C391 3101051040010 0.1UF 1013 C392 3101051040010 0.1UF 1014 C393 3101051040010 0.1UF 1015 C394 3101051040010 0.1UF 1016 C398 3101051040010 0.1UF 1017 C400 3101051040010 0.1UF 1018 C407 3101051040010 0.1UF...
  • Page 152 Service Manual Ref. No. Part No. Description 1054 C947 3101051040010 0.1UF 1055 C950 3101051040010 0.1UF 1056 C955 3101051040010 0.1UF 1057 C958 3101051040010 0.1UF 1058 C967 3101051040010 0.1UF 1059 C968 3101051040010 0.1UF 1060 C969 3101051040010 0.1UF 1061 3101051040010 0.1UF 1062 C1016 3101061040010 0.1UF 1063...
  • Page 153 Service Manual Ref. No. Part No. Description 1098 C438 3101054740000 0.47UF 1099 C439 3101054740000 0.47UF 1100 C287 3101064740000 0.47UF 1101 C715 3101064740000 0.47UF 1102 C255 3101051050000 1103 C276 3101051050000 1104 C305 3101051050000 1105 C310 3101051050000 1106 C719 3101051050000 1107 C962 3101051050000 1108 C238...
  • Page 154 Service Manual Ref. No. Part No. Description 1142 C908 3101061050020 1143 C923 3101061050020 1144 C924 3101061050020 1145 C925 3101061050020 1146 C938 3101061050020 1147 C946 3101061050020 1148 C966 3101061050020 1149 C750 3101071050020 1150 C1009 3104071050070 1151 3104071050070 1152 C920 3101062250000 2.2UF 1153 C932 3101062250000...
  • Page 155 Service Manual Ref. No. Part No. Description 1186 C284 3103994760180 47uf 1187 C804 3103994760180 47uf 1188 C914 3103994760180 47uf 1189 L814 3212106569000 5.6nH 1190 L105 3237199080000 1191 L114 3237199080000 1192 L811 3217106829010 8.2nH 1193 C6194 3212106100000 10nH 1194 L6103 3212106100000 10nH 1195 L832...
  • Page 156 Service Manual Ref. No. Part No. Description 1230 L147 3210406471000 470nH 1231 L151 3210406471000 470nH 1232 L718 3210406471000 470nH 1233 L103 3217607471000 470nH 1234 L107 3217607471000 470nH 1235 L108 3217607471000 470nH 1236 L110 3217607471000 470nH 1237 L112 3217607471000 470nH 1238 L116 3217607471000 470nH...
  • Page 157 Service Manual Ref. No. Part No. Description 1274 R157 3221506601000 Bead 1275 R179 3221506601000 Bead 1276 R186 3221506601000 Bead 1277 L801 3221513600000 Bead 1278 L802 3221513600000 Bead 1279 L803 3221513600000 Bead 1280 L900 3221513600000 Bead 1281 L916 3221513600000 Bead 1282 L917 3221513600000 Bead...
  • Page 158 Service Manual Ref. No. Part No. Description 1318 L806 3213306102000 1319 L820 3217112102020 1320 L828 3217112102020 1321 3213212332000 3.3uH 1322 L156 3213212332000 3.3uH 1323 L715 3213212332000 3.3uH 1324 L717 3212206682000 6.8uH 1325 L903 3213099472000 4.7uH 1326 L931 3213099472000 4.7uH 1327 L902 3217299103000 10uH...
  • Page 159 Service Manual Ref. No. Part No. Description 1362 D236 3310240200000 ESD protection diode 1363 D239 3310240200000 ESD protection diode 1364 D235 3302031100010 Zener diode 1365 D409 3310240000040 ESD protection diode 1366 D237 3310990000090 ESD protection diode 1367 D238 3310990000090 ESD protection diode 1368 D407 3399040600010...
  • Page 160 Service Manual Ref. No. Part No. Description 1406 Q116 3403999000000 Transistor 1407 Q117 3403999000000 Transistor 1408 Q102 3401002000990 NPN transistor 1409 Q111 3401002000990 NPN transistor 1410 Q104 3403003000060 NPN transistor 1411 Q702 3403003000060 NPN transistor 1412 Q107 3404006000000 NPN transistor 1413 Q109 3404006000000...
  • Page 161 Service Manual Ref. No. Part No. Description 1450 Q6103 3404999000000 NPN transistor 1451 Q801 3404999000000 NPN transistor 1452 Q804 3504990000030 MOSFET 1453 Q805 3504990000010 MOSFET 1454 Q810 3403002000000 PNP transistor 1455 Q902 3403002000000 PNP transistor 1456 Q906 3414001000020 NPN transistor 1457 Q910 3414001000020...
  • Page 162 Service Manual Ref. No. Part No. Description 1494 X100 3701019250030 TCXO (19.2MHz) 1495 X302 3701019250040 Temperature compensated crystal oscillator (19.2MHz) 1496 X375 3701327610060 Crystal 1497 F900 4099000000050 Fuse 1498 J400 5201020000020 Connector 1499 J404 5206040200010 FFC connector 1500 41MD7801000F0 PCB 1501 6201928000000 VCO shielding mask...
  • Page 163 Service Manual 12.8 Troubleshooting Flow Chart Receiver Circuit...
  • Page 164 Service Manual Description of Normal Situations: [1] During sensitivity test, use a communication test set to demodulate the audio signal (TP4012 and TP4016). If the signal is demodulated normally, it is concluded that the front panel is defective. [2] Use the communication test set to input a 73.35MHz IF signal at the mixer, and see whether it can be processed normally afterwards.
  • Page 165 Service Manual Transmitter Circuit...
  • Page 166 Service Manual Description of Normal Situations: [1] The current in analog mode is above 6A under 45W power supply and above 1A under 5W. However, in digital mode, the current will be reduced by 50%. [2] The APC voltage should be above 2V at TP811. [3] Check whether there is an appropriate TX LO signal at TP803.
  • Page 167 Service Manual...
  • Page 168 Service Manual Description of Normal Situations: [1] Detect the oscillation frequency of RX TP123 and TX TP111 using a spectrum analyzer. [2] Check whether switches (Q108, Q112, Q101 and Q105) are turned on and output 3.6V. [3] Check whether the emitter voltage of the four transistors (Q106, Q110, Q100 and Q103) is about 1.8V under normal RX/TX status.
  • Page 169 Service Manual 13. UHF2 (450-520MHz 25W) Information 13.1 Transmitter Circuit The transmitter circuit is composed of power amplifier circuit and power control circuit. The former is used to amplify the VCO signal to the desired output power level, while the latter can keep the output power at the desired level, so as to protect the power amplifier from damage caused by over heat, antenna mismatch, and out-of-range voltage (over voltage or under voltage may result in damage to Q801, Q805, Q804, Q802 and Q803).
  • Page 170 Service Manual The driver power amplifier is formed by Q804, with variable gain controlled by voltage VGG. The maximum output power is 38.5dBm, and the maximum variable gain is 11dB. 13.1.5 Final Power Amplifier The final power amplifier comprises Q802 and Q803, with the maximum output power of 48.5dBm, and the maximum variable gain of 10dB.
  • Page 171 Service Manual to output a voltage VGG, which can control both gate voltage and gain of Q804 and Q805, ensuring a constant power output. 13.1.10 Thermal and Over-voltage Protections The circuit consists of thermistor RT804 and resistor R884. The output voltage is proportional to the detected temperature.
  • Page 172 Service Manual out-of-band spurious signals, and then feed to the two-stage IF amplifier circuit (composed of Q6133 and Q6134) for amplification. Finally the amplified signals go to the IF IC for processing 13.2.2 Receiver Back-end Figure 13-3 Diagram of IF Processor The first IF signal (73.35MHz) output by the IF amplifier goes into IF IC via Pin 47, where the signal is converted to the second IF signal (2.25MHz).
  • Page 173 Service Manual 13.3.3 PLL IC The PLL IC (U100) is a fractional frequency divider. The logic IC U101 and U102 work with the PLL IC (U100) to achieve locking. Figure 13-4 Diagram of PLL IC The 19.2MHz frequency generated by the reference oscillator goes into the PLL IC for division, generating the reference frequency.
  • Page 174 Service Manual TX_L_VCO Q103 TX PA Q102 Q107 Q100 TX_H_VCO PLL IC （U100） RX_L_VCO Q110 RX Lo Q109 Q111 Q106 RX_H_VCO Figure 13-5 Diagram of VCO...
  • Page 175 13.4 PCB View MD78X/MD78XG PCB View (Front Panel) Top Layer...
  • Page 176 MD78X/MD78XG PCB View (Front Panel) Bottom Layer...
  • Page 177 MD78X/MD78XG PCB View (Main Board) Top Layer...
  • Page 178 PCB View (Main Board) MD78X/MD78XG Bottom Layer...
  • Page 179 13.5 Block Diagram MD78X/MD78XG Block Diagram (Power Section) Auto baterry Voltage Q802\Q803\U201 13.6 Q804\Q805 9V3A 9V1A Q920\Q921\U914 Q801 Q801 Q6102 9V1A Q902 Q6103 U6000 U703 Q6105 U701 U702 U701 U915 4V3A Q100\Q103\Q106\Q110 Q104 U100 U918 3V3A X100 U905 U500 ON\OFF KEY PWB IGN_SENCE EMERGENCY U231...
  • Page 180 MD78X/MD78XG Block Diagram (RF Section) High Temperature Protection 9V1A_TX Gain:10 dB Gain:11dB Gain:15 dB Tx/Rx Gain:16 dB Switch Gain:-6 dB Tx_PORT Microstrip Attenuator Match Match Match Matcher Microstrip Dual Q804 Harmonic Q805 Q801 Rx_PORT Directional Coupler Driver Filter PreDriver Firststage Switch s Power 9.1V Q802 Q803...
  • Page 181 MD78X/MD78XG Block Diagram (BB Section) IF processor RF Unit BB Schematic Block Diagram TX RX CTL MCSI1 McBSP2 GPIOs TEMP_DET Audio Codec Nor FLASH and pSRAM Headset McBSP1 FLASH: 8Mx16 Driver datax16 pSRAM:2Mx16 TMS320C55x BELL Driver Speed:96MHz(max) Mobile SDRAM McBSP3 128Mb:8Mx16 JTAG JTAG...
  • Page 182 13.6 Schematic Diagram MD78X/MD78XG Schematic Diagram (Audio Circuit) R245 R245 EXT_SPKR+ R253 R253 EXT_SPKR- R293 R293 SPKR1+ R294 R294 SPKR1- L232 L232 BLM18PG300SN1 BLM18PG300SN1 9d3V C232 C232 C233 C233 0.1u 0.1u C285 C285 C284 C284 0.1u 0.1u C234 C234 C235 C235 10uF/25V 10uF/25V...
  • Page 183 MD78X/MD78XG Schematic Diagram (RX Circuit) L6100 L6100 BLM18PG600SN1 BLM18PG600SN1 9V1A_RX C6100 C6100 R6100 R6100 C6102 C6102 C6185 C6185 R6101 R6101 470p 470p R6102 R6102 TRANSISTOR TRANSISTOR L6101 L6101 Q6101 Q6101 BLM18PG600SN1 BLM18PG600SN1 TRANSISTOR TRANSISTOR RF_ATTEN C6103 C6103 220p 220p TX TP TX TP Q6100 Q6100...
  • Page 184 MD78X/MD78XG Schematic Diagram (DAC Circuit) L500 L500 BLM18PG600SN1 BLM18PG600SN1 C471 C471 C405 C405 0.1u 0.1u 10uF/10V 10uF/10V R570 R570 R542 0 R542 0 C484 C484 1000p 1000p C509 C509 C508 C508 C483 C483 C510 C510 R528 R528 8200p 8200p 0.1u 0.1u 100P 100P...
  • Page 185 MD78X/MD78XG Schematic Diagram (Memory Circuit) F_D0 R487 R487 F_D0_LCD F_D1 R489 R489 F_D1_LCD F_D2 R490 R490 F_D2_LCD F_D3 R492 R492 F_D3_LCD F_D4 R515 R515 F_D4_LCD F_D5 R516 R516 F_D5_LCD F_D6 R517 R517 F_D6_LCD F_D7 R518 R518 F_D7_LCD R519 R519 /OE_LCD R520 R520 /WE_LCD...
  • Page 186 MD78X/MD78XG Schematic Diagram (OMAP Circuit) 19.2_OMAP 3V3A R414 R414 R419 R419 C338 C338 C336 C336 C401 C401 0.1u 0.1u 10u/16V 10u/16V 1000p 1000p TP309 TP309 C364 39p C364 39p X302 X302 TP377 TP377 L151 L151 C337 C337 R426 R426 C375 C375 C376 C376...
  • Page 187 MD78X/MD78XG Schematic Diagram (OMAP & GPS Circuit) 3V3D TP326 TP326 R323 R323 R325 R325 U302B U302B OMAP OMAP 3V3D MPUIO2/SPIF.CS1/UWIRE.CS1 LCD.P0 U322 U322 R357 R357 98_PE MPUIO4/SPIF.CS2/UWIRE.CS2/LED2 LCD.P1 R329 R329 R330 R330 R327 R327 DVDD_IO SLC/SPC I2C_SCL 98_PC MPUIO1/SPIF.SCK LCD.P2 R324 R324 R334 10K...
  • Page 188 Peripheral Interface MD78X/MD78XG Schematic Diagram ( Circuit) 3V3D C482 C482 C481 C481 C409 C409 C410 C410 C411 C411 C412 C412 C413 C413 C414 C414 C415 C415 C416 C416 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p J400 J400 100p...
  • Page 189 MD78X/MD78XG Schematic Diagram 40-Pin Interface Circuit) SPK+ SPK+ 3V3D C468 C468 C439 C439 C438 C438 C441 C441 C440 C440 C435 C435 C420 C420 C419 C419 USB_VBUS R494 R494 R555 R555 100p 100p 0.47u 0.47u 0.47u 0.47u 100p 100p 100p 100p 100p 100p 100p...
  • Page 190 MD78X/MD78XG Schematic Diagram (Power Circuit) U900 U900 RP102N331B RP102N331B 3V3D TP4031 TP4031 VOUT TP4032 TP4032 C900 C900 C901 C901 B900 B900 MMBZ6V8ALT1G MMBZ6V8ALT1G D237 D237 U901 U901 C902 C902 D900 D900 RP102N331B RP102N331B 3V3DP TP4035 TP4035 C903 C903 470p/50V 470p/50V VOUT 470uF/25V 470uF/25V...
  • Page 191 MD78X/MD78XG Schematic Diagram (PLL Circuit) 5VA_FGU L156 L156 3.3UH 3.3UH R175 R175 0.1u 0.1u C1010 C1010 C1009 C1009 1000p 1000p 1000p 1000p 1u/16V 1u/16V 3V3A_FGU 601SN1 601SN1 601SN1 601SN1 0.01U 0.01U 0.1u 0.1u 601SN1 601SN1 C121 C121 100p 100p 0.1u 0.1u PLLLD PLLLD...
  • Page 192 MD78X/MD78XG Schematic Diagram (VCO Circuit) R153 R153 601SN1 601SN1 Q101 Q101 EMD22 EMD22 4V3A R142 R142 220p 220p 0.1u 0.1u 3.3k 3.3k 470n 470n R145 R145 TX_VCO_H 220p 220p C195 C195 C194 C194 R143 R143 220p 220p 0.1u 0.1u 6.8k 6.8k L103 L103...
  • Page 193 MD78X/MD78XG Schematic Diagram (IF Circuit) TP703 TP703 TP702 TP702 TP704 TP704 C701 C701 C703 C703 2FLO 2FLO 330n 330n 0.01u 0.01u TP701 TP701 IF-out L716 L716 C743 C743 TEST POINT TEST POINT C702 C702 0.01u 0.01u L701 L701 L702 L702 601S 601S L703...
  • Page 194 MD78X/MD78XG Schematic Diagram ( Circuit) C909 C909 C889 C889 C913 C913 C888 C888 C825 C825 C885 C885 L801 L801 C855 C855 47pF 47pF 470p 470p BLM41PG600SN1 BLM41PG600SN1 W801 W801 100p 100p 3300p 3300p 0.018uF 0.018uF 33pF 33pF C916 C916 C930 C930 C931 C931...
  • Page 195 MD78X/MD78XG Schematic Diagram (Front Panel) 3V3A TP10 TP10 TP11 TP11 TP12 TP12 TP13 TP13 TP14 TP14 TP15 TP15 TP16 TP16 TP17 TP17 MMBZ6V8ALT1G MMBZ6V8ALT1G 100pf 100pf MENU 100pf 100pf 0.1uf 0.1uf DOWN EMI FILTER EMI FILTER UART2_RXD LOGIC IC LOGIC IC PRST BACK UART2_TXD...
  • Page 196 Service Manual 13.7 Parts List Main Board for MD78X/MD78XG Ref. No. Part No. Description C6115 3001050000000 0Ω C6123 3001050000000 0Ω C6172 3001050000000 0Ω L414 3001050000000 0Ω L415 3001050000000 0Ω L417 3001050000000 0Ω L418 3001050000000 0Ω R174 3001050000000 0Ω R188 3001050000000 0Ω...
  • Page 197 Service Manual Ref. No. Part No. Description R6123 3001050000000 0Ω R729 3001050000000 0Ω R731 3001050000000 0Ω R837 3001050000000 0Ω R857 3001050000000 0Ω R863 3001050000000 0Ω R889 3001050000000 0Ω R891 3001050000000 0Ω R894 3001050000000 0Ω R902 3001050000000 0Ω R904 3001050000000 0Ω R920 3001050000000 0Ω...
  • Page 198 Service Manual Ref. No. Part No. Description C815 3001070000000 0Ω C839 3001070000000 0Ω L808 3001080000000 0Ω R245 3001160100000 1Ω R253 3001160100000 1Ω R293 3001160100000 1Ω R294 3001160100000 1Ω R826 3001060100000 1Ω R828 3001060100000 1Ω R804 3001084790000 4.7Ω R806 3001084790000 4.7Ω R807 3001084790000 4.7Ω...
  • Page 199 Service Manual Ref. No. Part No. Description R367 3001053300010 33Ω R368 3001053300010 33Ω R369 3001053300010 33Ω R370 3001053300010 33Ω R371 3001053300010 33Ω R376 3001053300010 33Ω R380 3001053300010 33Ω R381 3001053300010 33Ω R387 3001053300010 33Ω R400 3001053300010 33Ω R402 3001053300010 33Ω R408 3001053300010 33Ω...
  • Page 200 Service Manual Ref. No. Part No. Description R519 3001053300010 33Ω R520 3001053300010 33Ω R521 3001053300010 33Ω R522 3001053300010 33Ω R523 3001053300010 33Ω R524 3001053300010 33Ω R525 3001053300010 33Ω R526 3001053300010 33Ω R527 3001053300010 33Ω R533 3001053300010 33Ω R545 3001053300010 33Ω R552 3001053300010 33Ω...
  • Page 201 Service Manual Ref. No. Part No. Description R146 3001051010040 100Ω R147 3001051010040 100Ω R148 3001051010040 100Ω R160 3001051010040 100Ω R190 3001051010040 100Ω R196 3001051010040 100Ω R129 3001051010000 100Ω R135 3001051010000 100Ω R251 3001051010000 100Ω R260 3001051010000 100Ω R271 3001051010000 100Ω R278 3001051010000 100Ω...
  • Page 202 Service Manual Ref. No. Part No. Description R136 3001052210000 220Ω R933 3001052210000 220Ω R984 3001052210000 220Ω R803 3001062210000 220Ω R816 3001072210000 220Ω R817 3001072210000 220Ω R827 3001062710000 270Ω R6133 3001053310010 330Ω R6129 3001063310010 330Ω R961 3001083310010 330Ω R546 3001054710000 470Ω R547 3001054710000 470Ω...
  • Page 203 Service Manual Ref. No. Part No. Description R941 3001051020010 1KΩ R947 3001051020010 1KΩ R957 3001051020010 1KΩ R978 3001051020010 1KΩ R859 3001061020010 1KΩ R924 3001061020010 1KΩ R939 3001061020010 1KΩ R954 3001061020010 1KΩ R970 3001061020010 1KΩ R974 3001061020010 1KΩ R946 3001071020000 1KΩ R291 3001051220000 1.2K...
  • Page 204 Service Manual Ref. No. Part No. Description R437 3001054720000 4.7K R448 3001054720000 4.7K R468 3001054720000 4.7K R469 3001054720000 4.7K R470 3001054720000 4.7K R471 3001054720000 4.7K R472 3001054720000 4.7K R488 3001054720000 4.7K R496 3001054720000 4.7K R499 3001054720000 4.7K R511 3001054720000 4.7K R6135 3001054720000 4.7K...
  • Page 205 Service Manual Ref. No. Part No. Description R235 3001051030000 10KΩ R236 3001051030000 10KΩ R258 3001051030000 10KΩ R259 3001051030000 10KΩ R261 3001051030000 10KΩ R316 3001051030000 10KΩ R322 3001051030000 10KΩ R326 3001051030000 10KΩ R351 3001051030000 10KΩ R353 3001051030000 10KΩ R365 3001051030000 10KΩ R366 3001051030000 10KΩ...
  • Page 206 Service Manual Ref. No. Part No. Description R501 3001051030000 10KΩ R506 3001051030000 10KΩ R509 3001051030000 10KΩ R510 3001051030000 10KΩ R512 3001051030000 10KΩ R530 3001051030000 10KΩ R531 3001051030000 10KΩ R532 3001051030000 10KΩ R534 3001051030000 10KΩ R535 3001051030000 10KΩ R538 3001051030000 10KΩ R539 3001051030000 10KΩ...
  • Page 207 Service Manual Ref. No. Part No. Description R811 3001061830010 18KΩ R155 3001052030000 20KΩ R195 3001052030000 20KΩ R6136 3001052030000 20KΩ R975 3001052030000 20KΩ R845 3001062030000 20KΩ R244 3001052230010 22KΩ R246 3001052230010 22KΩ R940 3001052230010 22KΩ R944 3001052230010 22KΩ R273 3001052430010 24KΩ R915 3001052430010 24KΩ...
  • Page 208 Service Manual Ref. No. Part No. Description R877 3001054730000 47KΩ R931 3001054730000 47KΩ R949 3001054730000 47KΩ R959 3001054730000 47KΩ R727 3001064730000 47KΩ R728 3001064730000 47KΩ R906 3001064730000 47KΩ R943 3001064730000 47KΩ R969 3001064730000 47KΩ R895 3001055130010 51KΩ R934 3001055130010 51KΩ R237 3001055630000 56KΩ...
  • Page 209 Service Manual Ref. No. Part No. Description R956 3001051840000 180K R882 3001052240000 220K R886 3001052240000 220K R6113 3001052740000 270K R917 3001053340010 330K R864 3001054740010 470K R897 3001054740010 470K R898 3001054740010 470K R899 3001054740010 470K RN230 3005051010010 100Ω RN500 3005051010010 100Ω C181 3101050590010 0.5PF...
  • Page 210 Service Manual Ref. No. Part No. Description 3101060500010 C6111 3101050500000 C6112 3101050500000 C192 3101060400010 C812 3101080500010 C820 3101080500010 C831 3101080500010 C833 3101080500010 3101050500010 C164 3101050500010 C165 3101050500010 C166 3101050500010 C168 3101050500010 3101050500010 3101050500010 C819 3101080600010 C841 3101080600010 3101050600010 C6114 3101050600010 C731 3101050600010 C190...
  • Page 211 Service Manual Ref. No. Part No. Description C6161 3101051200020 12PF C6162 3101051200020 12PF C6164 3101051200020 12PF C189 3101061200000 12PF C6129 3101051500020 15PF C6130 3101051500020 15PF C6177 3101051500020 15PF C723 3101051500020 15PF C818 3101061500010 15PF L826 3101061600000 16PF 3101051800010 18PF C724 3101051800010 18PF C814...
  • Page 212 Service Manual Ref. No. Part No. Description C6141 3101053300000 33PF C6142 3101053300000 33PF C6143 3101053300000 33PF C1004 3101063300000 33PF C803 3101063300000 33PF C888 3101063300000 33PF C913 3101063300000 33PF C364 3101053900000 39PF C749 3101053900000 39PF 3101054700010 47PF L833 3101064700000 47PF R824 3101064700000 47PF C825...
  • Page 213 Service Manual Ref. No. Part No. Description C346 3101051010030 100PF C347 3101051010030 100PF C348 3101051010030 100PF C349 3101051010030 100PF C350 3101051010030 100PF C351 3101051010030 100PF C352 3101051010030 100PF C353 3101051010030 100PF C354 3101051010030 100PF C355 3101051010030 100PF C357 3101051010030 100PF C358 3101051010030 100PF...
  • Page 214 Service Manual Ref. No. Part No. Description C447 3101051010030 100PF C448 3101051010030 100PF C449 3101051010030 100PF C450 3101051010030 100PF C451 3101051010030 100PF C452 3101051010030 100PF C453 3101051010030 100PF C454 3101051010030 100PF C455 3101051010030 100PF C456 3101051010030 100PF C463 3101051010030 100PF C465 3101051010030 100PF...
  • Page 215 Service Manual Ref. No. Part No. Description C6118 3101051510000 150PF C875 3101051510000 150PF C843 3101061510000 150PF C847 3101061510000 150PF C848 3101061510000 150PF C716 3101061810010 180PF C861 3101061810010 180PF C100 3101052210010 220PF C1000 3101052210010 220PF C147 3101052210010 220PF C150 3101052210010 220PF C156 3101052210010 220PF...
  • Page 216 Service Manual Ref. No. Part No. Description C6106 3101052210010 220PF C6107 3101052210010 220PF C6128 3101052210010 220PF C6144 3101052210010 220PF C6159 3101052210010 220PF C704 3101052210010 220PF C883 3101052210010 220PF C890 3101052210010 220PF C895 3101052210010 220PF C896 3101052210010 220PF C897 3101052210010 220PF C898 3101052210010 220PF...
  • Page 217 Service Manual Ref. No. Part No. Description C746 3101054710010 470PF 3101054710010 470PF C945 3101054710010 470PF C811 3101064710000 470PF C817 3101064710000 470PF C850 3101084710010 470PF C827 3101374710000 470PF C893 3101374710000 470PF 3101051020010 1000PF C1002 3101051020010 1000PF C1010 3101051020010 1000PF C337 3101051020010 1000PF C338 3101051020010...
  • Page 218 Service Manual Ref. No. Part No. Description C507 3101051030020 0.01UF 3101051030020 0.01UF C6147 3101051030020 0.01UF C6178 3101051030020 0.01UF C702 3101051030020 0.01UF C725 3101051030020 0.01UF C736 3101051030020 0.01UF 3101051030020 0.01UF 3101051030020 0.01UF 3101051030020 0.01UF C952 3101061030010 0.01UF C894 3101051830000 0.018UF C930 3101061830000 0.018UF C246...
  • Page 219 Service Manual Ref. No. Part No. Description C366 3101051040010 0.1UF 1010 C379 3101051040010 0.1UF 1011 C380 3101051040010 0.1UF 1012 C382 3101051040010 0.1UF 1013 C383 3101051040010 0.1UF 1014 C386 3101051040010 0.1UF 1015 C387 3101051040010 0.1UF 1016 C388 3101051040010 0.1UF 1017 C389 3101051040010 0.1UF 1018...
  • Page 220 Service Manual Ref. No. Part No. Description C744 3101051040010 0.1UF 1054 C756 3101051040010 0.1UF 1055 3101051040010 0.1UF 1056 3101051040010 0.1UF 1057 3101051040010 0.1UF 1058 3101051040010 0.1UF 1059 3101051040010 0.1UF 1060 C947 3101051040010 0.1UF 1061 C950 3101051040010 0.1UF 1062 C955 3101051040010 0.1UF 1063 C958...
  • Page 221 Service Manual Ref. No. Part No. Description 3110071040000 0.1UF 1098 3110071040000 0.1UF 1099 3110071040000 0.1UF 1100 3110071040000 0.1UF 1101 3110071040000 0.1UF 1102 3110071040000 0.1UF 1103 C941 3101051540000 0.15UF 1104 C132 3101062240000 0.22UF 1105 C294 3101063340000 0.33UF 1106 C438 3101054740000 0.47UF 1107 C439 3101054740000...
  • Page 222 Service Manual Ref. No. Part No. Description C6149 3101061050020 1142 C6185 3101061050020 1143 C6190 3101061050020 1144 C742 3101061050020 1145 C754 3101061050020 1146 C900 3101061050020 1147 C901 3101061050020 1148 C905 3101061050020 1149 C906 3101061050020 1150 C908 3101061050020 1151 C923 3101061050020 1152 C924 3101061050020 1153...
  • Page 223 Service Manual Ref. No. Part No. Description C980 3101081060010 10UF 1186 C981 3101081060010 10UF 1187 C951 3104081060120 10UF 1188 C919 3101072260000 22UF 1189 C915 3101082260020 22UF 1190 C804 3101092260010 22UF 1191 C933 3101092260010 22UF 1192 C284 3103994760180 47UF 1193 C914 3103994760180 47UF 1194...
  • Page 224 Service Manual Ref. No. Part No. Description L6120 3210306470000 47nH 1230 L6102 3210306221000 220nH 1231 L708 3217107221010 220nH 1232 L6125 3210406331000 330nH 1233 L716 3210406331000 330nH 1234 L147 3210406471000 470nH 1235 L151 3210406471000 470nH 1236 L718 3210406471000 470nH 1237 L103 3217607471000 470nH 1238...
  • Page 225 Service Manual Ref. No. Part No. Description L822 3221506601000 Bead 1274 L824 3221506601000 Bead 1275 L825 3221506601000 Bead 1276 3221506601000 Bead 1277 R153 3221506601000 Bead 1278 R157 3221506601000 Bead 1279 R179 3221506601000 Bead 1280 R186 3221506601000 Bead 1281 L801 3221513600000 Bead 1282 L802...
  • Page 226 Service Manual Ref. No. Part No. Description L804 3233099160000 16nH 1318 L809 3233099160000 16nH 1319 L810 3233099160000 16nH 1320 L813 3233099160000 16nH 1321 L817 3233099160000 16nH 1322 L807 3210306101000 100nH 1323 L820 3217112102020 1324 L828 3217112102020 1325 3213212332000 3.3uH 1326 L156 3213212332000 3.3uH...
  • Page 227 Service Manual Ref. No. Part No. Description D402 3310240000000 Diode 1362 D403 3310240000000 Diode 1363 D404 3310240000000 Diode 1364 D405 3310240000000 Diode 1365 D406 3310240000000 Diode 1366 D234 3310240200000 Diode 1367 D236 3310240200000 Diode 1368 D239 3310240200000 Diode 1369 D235 3302031100010 Zener diode 1370...
  • Page 228 Service Manual Ref. No. Part No. Description Q101 3403999000000 Transistor 1406 Q105 3403999000000 Transistor 1407 Q108 3403999000000 Transistor 1408 Q112 3403999000000 Transistor 1409 Q116 3403999000000 Transistor 1410 Q117 3403999000000 Transistor 1411 Q102 3401002000990 NPN transistor 1412 Q111 3401002000990 NPN transistor 1413 Q104 3403003000060...
  • Page 229 Service Manual Ref. No. Part No. Description Q411 3414999000000 Transistor 1450 Q412 3414999000000 Transistor 1451 Q701 3408002000000 NPN transistor 1452 Q6102 3404999000000 NPN transistor 1453 Q6103 3404999000000 NPN transistor 1454 Q801 3404999000000 NPN transistor 1455 Q804 3504990000040 RD07MU 1456 Q805 3504990000010 RD01MU 1457...
  • Page 230 Service Manual Ref. No. Part No. Description U6000 3605002057090 OPAMP 1494 U910 3609010000170 Reset IC 1495 U917 3609006003050 Reset IC 1496 X100 3701019250030 19.2MHZ TCXO 1497 X302 3701019250040 19.2MHZ TCXO 1498 X375 3701327610060 CRYSTAL 32.768KHz 1499 Z6100 3802733540030 D73312GQ22 1500 1501 41MD7801000F0 1502...
  • Page 231 Service Manual Ref. No. Part No. Description C6126 3101051890050 1.8PF 1538 C6127 3101051890050 1.8PF 1539...
  • Page 232 Service Manual 13.8 Troubleshooting Flow Chart Receiver Circuit...
  • Page 233 Service Manual Description of Normal Situations: [1] During sensitivity test, use a communication test set to demodulate the audio signal (TP4012 and TP4016). If the signal is demodulated normally, it is concluded that the front panel is defective. [2] Use the communication test set to input a 73.35MHz IF signal at the mixer, and see whether it can be processed normally afterwards.
  • Page 234 Service Manual Transmitter Circuit...
  • Page 235 Service Manual Description of Normal Situations: [1] The current in analog mode is above 6A under 45W power supply and above 1A under 5W. However, in digital mode, the current will be reduced by 50%. [2] The APC voltage should be above 2V at TP811. [3] Check whether there is an appropriate TX LO signal at TP803.
  • Page 236 Service Manual...
  • Page 237 Service Manual Description of Normal Situations: [1] Detect the oscillation frequency of RX TP123 and TX TP111 using a spectrum analyzer. [2] Check whether switches (Q108, Q112, Q101 and Q105) are turned on and output 3.6V. [3] Check whether the emitter voltage of the four transistors (Q106, Q110, Q100 and Q103) is about 1.8V under normal RX/TX status.
  • Page 238 Service Manual 14. UHF2 (450-520MHz 45W) Information 14.1 Transmitter Circuit The transmitter circuit is composed of power amplifier circuit and power control circuit. The former is used to amplify the VCO signal to the desired output power level, while the latter can keep the output power at the desired level, so as to protect the power amplifier from damage caused by over heat, antenna mismatch, and out-of-range voltage (over voltage or under voltage may result in damage to Q801, Q805, Q804, Q802 and Q803).
  • Page 239 Service Manual maximum output power is 38.5dBm, and the maximum variable gain is 11dB. 14.1.5 Final Power Amplifier The final power amplifier comprises Q802 and Q803, with the maximum output power of 48.5dBm, and the maximum variable gain of 10dB. The input matching circuit is composed of C815, C839, R804, R806, R807, R813, R818 and R861, while the power combining circuit is composed of C820, C8330, C831, C819, C812, C841 and C842.
  • Page 240 Service Manual constant power output. 14.1.10 Thermal and Over-voltage Protections The circuit consists of thermistor RT804 and resistor R884. The output voltage is proportional to the detected temperature. Both the voltage used for temperature detection and the threshold voltage are fed into the operational amplifier U803, to output a voltage signal that is in proportion to the detected temperature.
  • Page 241 Service Manual Q6134) for amplification. Finally the amplified signals go to the IF IC for processing 14.2.2 Receiver Back-end Figure 14-3 Diagram of IF Processor The first IF signal (73.35MHz) output by the IF amplifier goes into IF IC via Pin 47, where the signal is converted to the second IF signal (2.25MHz).
  • Page 242 Service Manual The PLL IC (U100) is a fractional frequency divider. The logic IC U101 and U102 work with the PLL IC (U100) to achieve locking. Figure 14-4 Diagram of PLL IC The 19.2MHz frequency generated by the reference oscillator goes into the PLL IC for division, generating the reference frequency.
  • Page 243 Service Manual TX_L_VCO Q103 TX PA Q102 Q107 Q100 TX_H_VCO PLL IC （U100） RX_L_VCO Q110 RX Lo Q109 Q111 Q106 RX_H_VCO Figure 14-5 Diagram of VCO...
  • Page 244 14.4 PCB View MD78X/MD78XG PCB View (Front Panel) Top Layer...
  • Page 245 MD78X/MD78XG PCB View (Front Panel) Bottom Layer...
  • Page 246 MD78X/MD78XG PCB View (Main Board) Top Layer...
  • Page 247 PCB View (Main Board) MD78X/MD78XG Bottom Layer...
  • Page 248 14.5 Block Diagram MD78X/MD78XG Block Diagram (Power Section) Auto baterry Voltage Q802\Q803\U201 13.6 Q804\Q805 9V3A 9V1A Q920\Q921\U914 Q801 Q801 Q6102 9V1A Q902 Q6103 U6000 U703 Q6105 U701 U702 U701 U915 4V3A Q104 Q100\Q103\Q106\Q110 U100 U918 3V3A X100 U905 U500 ON\OFF KEY PWB IGN_SENCE U231 EMERGENCY...
  • Page 249 MD78X/MD78XG Block Diagram (RF Section) High Temperature Protection 9V1A_TX Gain:10 dB Gain:15 dB Gain:11dB Tx/Rx Gain:16 dB Gain:-6 dB Switch Tx_PORT Microstrip Attenuator Match Match Match Matcher Microstrip Dual Q804 Harmonic Q805 Q801 Rx_PORT Directional Coupler Driver Filter PreDriver Firststage Switch s Power 9.1V Q802 Q803...
  • Page 250 MD78X/MD78XG Block Diagram (BB Section) IF processor RF Unit BB Schematic Block Diagram TX RX CTL MCSI1 McBSP2 GPIOs TEMP_DET Audio Codec Nor FLASH and pSRAM Headset McBSP1 FLASH: 8Mx16 Driver datax16 pSRAM:2Mx16 TMS320C55x BELL Driver Speed:96MHz(max) Mobile SDRAM McBSP3 128Mb:8Mx16 JTAG JTAG...
  • Page 251 14.6 Schematic Diagram MD78X/MD78XG Schematic Diagram (Audio Circuit) R245 R245 EXT_SPKR+ R253 R253 EXT_SPKR- R293 R293 SPKR1+ R294 R294 SPKR1- L232 L232 BLM18PG300SN1 BLM18PG300SN1 9d3V C232 C232 C233 C233 0.1u 0.1u C285 C285 C284 C284 0.1u 0.1u C234 C234 C235 C235 10uF/25V 10uF/25V...
  • Page 252 MD78X/MD78XG Schematic Diagram (RX Circuit) L6100 L6100 BLM18PG600SN1 BLM18PG600SN1 9V1A_RX C6100 C6100 R6100 R6100 C6102 C6102 C6185 C6185 R6101 R6101 470p 470p R6102 R6102 TRANSISTOR TRANSISTOR L6101 L6101 Q6101 Q6101 BLM18PG600SN1 BLM18PG600SN1 TRANSISTOR TRANSISTOR RF_ATTEN C6103 C6103 220p 220p TX TP TX TP Q6100 Q6100...
  • Page 253 MD78X/MD78XG Schematic Diagram (DAC Circuit) L500 L500 BLM18PG600SN1 BLM18PG600SN1 C471 C471 C405 C405 0.1u 0.1u 10uF/10V 10uF/10V R570 R570 R542 0 R542 0 C484 C484 1000p 1000p C509 C509 C508 C508 C483 C483 C510 C510 R528 R528 8200p 8200p 0.1u 0.1u 100P 100P...
  • Page 254 MD78X/MD78XG Schematic Diagram (Memory Circuit) F_D0 R487 R487 F_D0_LCD F_D1 R489 R489 F_D1_LCD F_D2 R490 R490 F_D2_LCD F_D3 R492 R492 F_D3_LCD F_D4 R515 R515 F_D4_LCD F_D5 R516 R516 F_D5_LCD F_D6 R517 R517 F_D6_LCD F_D7 R518 R518 F_D7_LCD R519 R519 /OE_LCD R520 R520 /WE_LCD...
  • Page 255 MD78X/MD78XG Schematic Diagram (OMAP Circuit) 19.2_OMAP 3V3A R414 R414 R419 R419 C338 C338 C336 C336 C401 C401 0.1u 0.1u 10u/16V 10u/16V 1000p 1000p TP309 TP309 C364 39p C364 39p X302 X302 TP377 TP377 L151 L151 C337 C337 R426 R426 C375 C375 C376 C376...
  • Page 256 MD78X/MD78XG Schematic Diagram (OMAP & GPS Circuit) 3V3D TP326 TP326 R323 R323 R325 R325 U302B U302B OMAP OMAP 3V3D MPUIO2/SPIF.CS1/UWIRE.CS1 LCD.P0 U322 U322 R357 R357 98_PE MPUIO4/SPIF.CS2/UWIRE.CS2/LED2 LCD.P1 R329 R329 R330 R330 R327 R327 DVDD_IO SLC/SPC I2C_SCL 98_PC MPUIO1/SPIF.SCK LCD.P2 R324 R324 R334 10K...
  • Page 257 Peripheral Interface MD78X/MD78XG Schematic Diagram ( Circuit) 3V3D C482 C482 C481 C481 C409 C409 C410 C410 C411 C411 C412 C412 C413 C413 C414 C414 C415 C415 C416 C416 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p J400 J400 100p...
  • Page 258 MD78X/MD78XG Schematic Diagram 40-Pin Interface Circuit) SPK+ SPK+ 3V3D C468 C468 C439 C439 C438 C438 C441 C441 C440 C440 C435 C435 C420 C420 C419 C419 USB_VBUS R494 R494 R555 R555 100p 100p 0.47u 0.47u 0.47u 0.47u 100p 100p 100p 100p 100p 100p 100p...
  • Page 259 MD78X/MD78XG Schematic Diagram (Power Circuit) U900 U900 RP102N331B RP102N331B 3V3D TP4031 TP4031 VOUT TP4032 TP4032 C900 C900 C901 C901 B900 B900 MMBZ6V8ALT1G MMBZ6V8ALT1G D237 D237 U901 U901 C902 C902 D900 D900 RP102N331B RP102N331B 3V3DP TP4035 TP4035 C903 C903 470p/50V 470p/50V VOUT 470uF/25V 470uF/25V...
  • Page 260 MD78X/MD78XG Schematic Diagram (PLL Circuit) 5VA_FGU L156 L156 3.3UH 3.3UH R175 R175 0.1u 0.1u C1010 C1010 C1009 C1009 1000p 1000p 1000p 1000p 1u/16V 1u/16V 3V3A_FGU 601SN1 601SN1 601SN1 601SN1 0.01U 0.01U 0.1u 0.1u 601SN1 601SN1 C121 C121 100p 100p 0.1u 0.1u PLLLD PLLLD...
  • Page 261 MD78X/MD78XG Schematic Diagram (VCO Circuit) R153 R153 601SN1 601SN1 Q101 Q101 EMD22 EMD22 4V3A R142 R142 220p 220p 0.1u 0.1u 3.3k 3.3k 470n 470n R145 R145 TX_VCO_H 220p 220p C195 C195 C194 C194 R143 R143 220p 220p 0.1u 0.1u 6.8k 6.8k L103 L103...
  • Page 262 MD78X/MD78XG Schematic Diagram (IF Circuit) TP703 TP703 TP702 TP702 TP704 TP704 C701 C701 C703 C703 2FLO 2FLO 330n 330n 0.01u 0.01u TP701 TP701 IF-out L716 L716 C743 C743 TEST POINT TEST POINT C702 C702 0.01u 0.01u L701 L701 L702 L702 601S 601S L703...
  • Page 263 MD78X/MD78XG Schematic Diagram ( Circuit) C909 C909 C889 C889 C913 C913 C888 C888 C825 C825 C885 C885 L801 L801 C855 C855 47pF 47pF 470p 470p BLM41PG600SN1 BLM41PG600SN1 W801 W801 100p 100p 3300p 3300p 0.018uF 0.018uF 33pF 33pF C916 C916 C930 C930 C931 C931...
  • Page 264 MD78X/MD78XG Schematic Diagram (Front Panel) 3V3A TP10 TP10 TP11 TP11 TP12 TP12 TP13 TP13 TP14 TP14 TP15 TP15 TP16 TP16 TP17 TP17 MMBZ6V8ALT1G MMBZ6V8ALT1G 100pf 100pf MENU 100pf 100pf 0.1uf 0.1uf DOWN EMI FILTER EMI FILTER UART2_RXD LOGIC IC LOGIC IC PRST BACK UART2_TXD...
  • Page 265 Service Manual 14.7 Parts List Main Board for MD78X/MD78XG Ref. No. Part No. Description C6115 3001050000000 0Ω C6123 3001050000000 0Ω C6172 3001050000000 0Ω L414 3001050000000 0Ω L415 3001050000000 0Ω L417 3001050000000 0Ω L418 3001050000000 0Ω R174 3001050000000 0Ω R188 3001050000000 0Ω...
  • Page 266 Service Manual Ref. No. Part No. Description R6123 3001050000000 0Ω R729 3001050000000 0Ω R731 3001050000000 0Ω R837 3001050000000 0Ω R857 3001050000000 0Ω R863 3001050000000 0Ω R889 3001050000000 0Ω R891 3001050000000 0Ω R894 3001050000000 0Ω R902 3001050000000 0Ω R904 3001050000000 0Ω R920 3001050000000 0Ω...
  • Page 267 Service Manual Ref. No. Part No. Description C815 3001070000000 0Ω C839 3001070000000 0Ω L808 3001080000000 0Ω R245 3001160100000 1Ω R253 3001160100000 1Ω R293 3001160100000 1Ω R294 3001160100000 1Ω R826 3001060100000 1Ω R828 3001060100000 1Ω R804 3001084790000 4.7Ω R806 3001084790000 4.7Ω R807 3001084790000 4.7Ω...
  • Page 268 Service Manual Ref. No. Part No. Description R367 3001053300010 33Ω R368 3001053300010 33Ω R369 3001053300010 33Ω R370 3001053300010 33Ω R371 3001053300010 33Ω R376 3001053300010 33Ω R380 3001053300010 33Ω R381 3001053300010 33Ω R387 3001053300010 33Ω R400 3001053300010 33Ω R402 3001053300010 33Ω R408 3001053300010 33Ω...
  • Page 269 Service Manual Ref. No. Part No. Description R519 3001053300010 33Ω R520 3001053300010 33Ω R521 3001053300010 33Ω R522 3001053300010 33Ω R523 3001053300010 33Ω R524 3001053300010 33Ω R525 3001053300010 33Ω R526 3001053300010 33Ω R527 3001053300010 33Ω R533 3001053300010 33Ω R545 3001053300010 33Ω R552 3001053300010 33Ω...
  • Page 270 Service Manual Ref. No. Part No. Description R146 3001051010040 100Ω R147 3001051010040 100Ω R148 3001051010040 100Ω R160 3001051010040 100Ω R190 3001051010040 100Ω R196 3001051010040 100Ω R129 3001051010000 100Ω R135 3001051010000 100Ω R251 3001051010000 100Ω R260 3001051010000 100Ω R271 3001051010000 100Ω R278 3001051010000 100Ω...
  • Page 271 Service Manual Ref. No. Part No. Description R136 3001052210000 220Ω R933 3001052210000 220Ω R984 3001052210000 220Ω R803 3001062210000 220Ω R816 3001072210000 220Ω R817 3001072210000 220Ω R827 3001062710000 270Ω R6133 3001053310010 330Ω R6129 3001063310010 330Ω R961 3001083310010 330Ω R546 3001054710000 470Ω R547 3001054710000 470Ω...
  • Page 272 Service Manual Ref. No. Part No. Description R941 3001051020010 1KΩ R947 3001051020010 1KΩ R957 3001051020010 1KΩ R978 3001051020010 1KΩ R859 3001061020010 1KΩ R924 3001061020010 1KΩ R939 3001061020010 1KΩ R954 3001061020010 1KΩ R970 3001061020010 1KΩ R974 3001061020010 1KΩ R946 3001071020000 1KΩ R291 3001051220000 1.2K...
  • Page 273 Service Manual Ref. No. Part No. Description R437 3001054720000 4.7K R448 3001054720000 4.7K R468 3001054720000 4.7K R469 3001054720000 4.7K R470 3001054720000 4.7K R471 3001054720000 4.7K R472 3001054720000 4.7K R488 3001054720000 4.7K R496 3001054720000 4.7K R499 3001054720000 4.7K R511 3001054720000 4.7K R6135 3001054720000 4.7K...
  • Page 274 Service Manual Ref. No. Part No. Description R235 3001051030000 10KΩ R236 3001051030000 10KΩ R258 3001051030000 10KΩ R259 3001051030000 10KΩ R261 3001051030000 10KΩ R316 3001051030000 10KΩ R322 3001051030000 10KΩ R326 3001051030000 10KΩ R351 3001051030000 10KΩ R353 3001051030000 10KΩ R365 3001051030000 10KΩ R366 3001051030000 10KΩ...
  • Page 275 Service Manual Ref. No. Part No. Description R501 3001051030000 10KΩ R506 3001051030000 10KΩ R509 3001051030000 10KΩ R510 3001051030000 10KΩ R512 3001051030000 10KΩ R530 3001051030000 10KΩ R531 3001051030000 10KΩ R532 3001051030000 10KΩ R534 3001051030000 10KΩ R535 3001051030000 10KΩ R538 3001051030000 10KΩ R539 3001051030000 10KΩ...
  • Page 276 Service Manual Ref. No. Part No. Description R811 3001061830010 18KΩ R155 3001052030000 20KΩ R195 3001052030000 20KΩ R6136 3001052030000 20KΩ R975 3001052030000 20KΩ R845 3001062030000 20KΩ R244 3001052230010 22KΩ R246 3001052230010 22KΩ R940 3001052230010 22KΩ R944 3001052230010 22KΩ R273 3001052430010 24KΩ R915 3001052430010 24KΩ...
  • Page 277 Service Manual Ref. No. Part No. Description R877 3001054730000 47KΩ R931 3001054730000 47KΩ R949 3001054730000 47KΩ R959 3001054730000 47KΩ R727 3001064730000 47KΩ R728 3001064730000 47KΩ R906 3001064730000 47KΩ R943 3001064730000 47KΩ R969 3001064730000 47KΩ R895 3001055130010 51KΩ R934 3001055130010 51KΩ R237 3001055630000 56KΩ...
  • Page 278 Service Manual Ref. No. Part No. Description R956 3001051840000 180K R882 3001052240000 220K R886 3001052240000 220K R6113 3001052740000 270K R917 3001053340010 330K R864 3001054740010 470K R897 3001054740010 470K R898 3001054740010 470K R899 3001054740010 470K RN230 3005051010010 100Ω RN500 3005051010010 100Ω C181 3101050590010 0.5PF...
  • Page 279 Service Manual Ref. No. Part No. Description 3101060500010 C6111 3101050500000 C6112 3101050500000 C192 3101060400010 C812 3101080500010 C820 3101080500010 C831 3101080500010 C833 3101080500010 3101050500010 C164 3101050500010 C165 3101050500010 C166 3101050500010 C168 3101050500010 3101050500010 3101050500010 C819 3101080600010 C841 3101080600010 3101050600010 C6114 3101050600010 C731 3101050600010 C190...
  • Page 280 Service Manual Ref. No. Part No. Description C6161 3101051200020 12PF C6162 3101051200020 12PF C6164 3101051200020 12PF C189 3101061200000 12PF C6129 3101051500020 15PF C6130 3101051500020 15PF C6177 3101051500020 15PF C723 3101051500020 15PF C818 3101061500010 15PF L826 3101061600000 16PF 3101051800010 18PF C724 3101051800010 18PF C814...
  • Page 281 Service Manual Ref. No. Part No. Description C6141 3101053300000 33PF C6142 3101053300000 33PF C6143 3101053300000 33PF C1004 3101063300000 33PF C803 3101063300000 33PF C888 3101063300000 33PF C913 3101063300000 33PF C364 3101053900000 39PF C749 3101053900000 39PF 3101054700010 47PF L833 3101064700000 47PF R824 3101064700000 47PF C825...
  • Page 282 Service Manual Ref. No. Part No. Description C346 3101051010030 100PF C347 3101051010030 100PF C348 3101051010030 100PF C349 3101051010030 100PF C350 3101051010030 100PF C351 3101051010030 100PF C352 3101051010030 100PF C353 3101051010030 100PF C354 3101051010030 100PF C355 3101051010030 100PF C357 3101051010030 100PF C358 3101051010030 100PF...
  • Page 283 Service Manual Ref. No. Part No. Description C447 3101051010030 100PF C448 3101051010030 100PF C449 3101051010030 100PF C450 3101051010030 100PF C451 3101051010030 100PF C452 3101051010030 100PF C453 3101051010030 100PF C454 3101051010030 100PF C455 3101051010030 100PF C456 3101051010030 100PF C463 3101051010030 100PF C465 3101051010030 100PF...
  • Page 284 Service Manual Ref. No. Part No. Description C6118 3101051510000 150PF C875 3101051510000 150PF C843 3101061510000 150PF C847 3101061510000 150PF C848 3101061510000 150PF C716 3101061810010 180PF C861 3101061810010 180PF C100 3101052210010 220PF C1000 3101052210010 220PF C147 3101052210010 220PF C150 3101052210010 220PF C156 3101052210010 220PF...
  • Page 285 Service Manual Ref. No. Part No. Description C6106 3101052210010 220PF C6107 3101052210010 220PF C6128 3101052210010 220PF C6144 3101052210010 220PF C6159 3101052210010 220PF C704 3101052210010 220PF C883 3101052210010 220PF C890 3101052210010 220PF C895 3101052210010 220PF C896 3101052210010 220PF C897 3101052210010 220PF C898 3101052210010 220PF...
  • Page 286 Service Manual Ref. No. Part No. Description C746 3101054710010 470PF 3101054710010 470PF C945 3101054710010 470PF C811 3101064710000 470PF C817 3101064710000 470PF C850 3101084710010 470PF C827 3101374710000 470PF C893 3101374710000 470PF 3101051020010 1000PF C1002 3101051020010 1000PF C1010 3101051020010 1000PF C337 3101051020010 1000PF C338 3101051020010...
  • Page 287 Service Manual Ref. No. Part No. Description C507 3101051030020 0.01UF 3101051030020 0.01UF C6147 3101051030020 0.01UF C6178 3101051030020 0.01UF C702 3101051030020 0.01UF C725 3101051030020 0.01UF C736 3101051030020 0.01UF 3101051030020 0.01UF 3101051030020 0.01UF 3101051030020 0.01UF C952 3101061030010 0.01UF C894 3101051830000 0.018UF C930 3101061830000 0.018UF C246...
  • Page 288 Service Manual Ref. No. Part No. Description C366 3101051040010 0.1UF 1010 C379 3101051040010 0.1UF 1011 C380 3101051040010 0.1UF 1012 C382 3101051040010 0.1UF 1013 C383 3101051040010 0.1UF 1014 C386 3101051040010 0.1UF 1015 C387 3101051040010 0.1UF 1016 C388 3101051040010 0.1UF 1017 C389 3101051040010 0.1UF 1018...
  • Page 289 Service Manual Ref. No. Part No. Description C744 3101051040010 0.1UF 1054 C756 3101051040010 0.1UF 1055 3101051040010 0.1UF 1056 3101051040010 0.1UF 1057 3101051040010 0.1UF 1058 3101051040010 0.1UF 1059 3101051040010 0.1UF 1060 C947 3101051040010 0.1UF 1061 C950 3101051040010 0.1UF 1062 C955 3101051040010 0.1UF 1063 C958...
  • Page 290 Service Manual Ref. No. Part No. Description 3110071040000 0.1UF 1098 3110071040000 0.1UF 1099 3110071040000 0.1UF 1100 3110071040000 0.1UF 1101 3110071040000 0.1UF 1102 3110071040000 0.1UF 1103 C941 3101051540000 0.15UF 1104 C132 3101062240000 0.22UF 1105 C294 3101063340000 0.33UF 1106 C438 3101054740000 0.47UF 1107 C439 3101054740000...
  • Page 291 Service Manual Ref. No. Part No. Description C6149 3101061050020 1142 C6185 3101061050020 1143 C6190 3101061050020 1144 C742 3101061050020 1145 C754 3101061050020 1146 C900 3101061050020 1147 C901 3101061050020 1148 C905 3101061050020 1149 C906 3101061050020 1150 C908 3101061050020 1151 C923 3101061050020 1152 C924 3101061050020 1153...
  • Page 292 Service Manual Ref. No. Part No. Description C980 3101081060010 10UF 1186 C981 3101081060010 10UF 1187 C951 3104081060120 10UF 1188 C919 3101072260000 22UF 1189 C915 3101082260020 22UF 1190 C804 3101092260010 22UF 1191 C933 3101092260010 22UF 1192 C284 3103994760180 47UF 1193 C914 3103994760180 47UF 1194...
  • Page 293 Service Manual Ref. No. Part No. Description L6120 3210306470000 47nH 1230 L6102 3210306221000 220nH 1231 L708 3217107221010 220nH 1232 L6125 3210406331000 330nH 1233 L716 3210406331000 330nH 1234 L147 3210406471000 470nH 1235 L151 3210406471000 470nH 1236 L718 3210406471000 470nH 1237 L103 3217607471000 470nH 1238...
  • Page 294 Service Manual Ref. No. Part No. Description L822 3221506601000 Bead 1274 L824 3221506601000 Bead 1275 L825 3221506601000 Bead 1276 3221506601000 Bead 1277 R153 3221506601000 Bead 1278 R157 3221506601000 Bead 1279 R179 3221506601000 Bead 1280 R186 3221506601000 Bead 1281 L801 3221513600000 Bead 1282 L802...
  • Page 295 Service Manual Ref. No. Part No. Description L804 3233099160000 16nH 1318 L809 3233099160000 16nH 1319 L810 3233099160000 16nH 1320 L813 3233099160000 16nH 1321 L817 3233099160000 16nH 1322 L807 3210306101000 100nH 1323 L820 3217112102020 1324 L828 3217112102020 1325 3213212332000 3.3uH 1326 L156 3213212332000 3.3uH...
  • Page 296 Service Manual Ref. No. Part No. Description D402 3310240000000 Diode 1362 D403 3310240000000 Diode 1363 D404 3310240000000 Diode 1364 D405 3310240000000 Diode 1365 D406 3310240000000 Diode 1366 D234 3310240200000 Diode 1367 D236 3310240200000 Diode 1368 D239 3310240200000 Diode 1369 D235 3302031100010 Zener diode 1370...
  • Page 297 Service Manual Ref. No. Part No. Description Q101 3403999000000 Transistor 1406 Q105 3403999000000 Transistor 1407 Q108 3403999000000 Transistor 1408 Q112 3403999000000 Transistor 1409 Q116 3403999000000 Transistor 1410 Q117 3403999000000 Transistor 1411 Q102 3401002000990 NPN transistor 1412 Q111 3401002000990 NPN transistor 1413 Q104 3403003000060...
  • Page 298 Service Manual Ref. No. Part No. Description Q411 3414999000000 Transistor 1450 Q412 3414999000000 Transistor 1451 Q701 3408002000000 NPN transistor 1452 Q6102 3404999000000 NPN transistor 1453 Q6103 3404999000000 NPN transistor 1454 Q801 3404999000000 NPN transistor 1455 Q804 3504990000040 RD07MU 1456 Q805 3504990000010 RD01MU 1457...
  • Page 299 Service Manual Ref. No. Part No. Description U6000 3605002057090 OPAMP 1494 U910 3609010000170 Reset IC 1495 U917 3609006003050 Reset IC 1496 X100 3701019250030 19.2MHZ TCXO 1497 X302 3701019250040 19.2MHZ TCXO 1498 X375 3701327610060 CRYSTAL 32.768KHz 1499 Z6100 3802733540030 D73312GQ22 1500 1501 41MD7801000F0 1502...
  • Page 300 Service Manual Ref. No. Part No. Description C6126 3101051890050 1.8PF 1538 C6127 3101051890050 1.8PF 1539...
  • Page 301 Service Manual 14.8 Troubleshooting Flow Chart Receiver Circuit...
  • Page 302 Service Manual Description of Normal Situations: [1] During sensitivity test, use a communication test set to demodulate the audio signal (TP4012 and TP4016). If the signal is demodulated normally, it is concluded that the front panel is defective. [2] Use the communication test set to input a 73.35MHz IF signal at the mixer, and see whether it can be processed normally afterwards.
  • Page 303 Service Manual Transmitter Circuit...
  • Page 304 Service Manual Description of Normal Situations: [1] The current in analog mode is above 6A under 45W power supply and above 1A under 5W. However, in digital mode, the current will be reduced by 50%. [2] The APC voltage should be above 2V at TP811. [3] Check whether there is an appropriate TX LO signal at TP803.
  • Page 305 Service Manual...
  • Page 306 Service Manual Description of Normal Situations: [1] Detect the oscillation frequency of RX TP123 and TX TP111 using a spectrum analyzer. [2] Check whether switches (Q108, Q112, Q101 and Q105) are turned on and output 3.6V. [3] Check whether the emitter voltage of the four transistors (Q106, Q110, Q100 and Q103) is about 1.8V under normal RX/TX status.
  • Page 307 Service Manual 15. UHF3 (350-400MHz 25W) Information 15.1 Transmitter Circuit The transmitter circuit is composed of power amplifier circuit and power control circuit. The former is used to amplify the VCO signal to the desired output power level, while the latter can keep the output power at the desired level, so as to protect the power amplifier from damage caused by over heat, antenna mismatch, and out-of-range voltage (over voltage or under voltage may result in damage to Q801, Q805, Q804, Q802 and Q803).
  • Page 308 Service Manual 15.1.4 Driver Power Amplifier The driver power amplifier is formed by Q804, with variable gain controlled by voltage VGG. The maximum output power is 38.5dBm, and the maximum variable gain is 11dB. 15.1.5 Final Power Amplifier The final power amplifier comprises Q802 and Q803, with the maximum output power of 48.5dBm, and the maximum variable gain of 10dB.
  • Page 309 Service Manual voltage that can represent the forward power. The voltage together with the preset voltage feeds to U801 to output a voltage VGG, which can control both gate voltage and gain of Q804 and Q805, ensuring a constant power output. 15.1.10 Thermal and Over-voltage Protections The circuit consists of thermistor RT804 and resistor R884.
  • Page 310 Service Manual to get a gain (17dB). The first LO signals (73.35MHz) pass through the crystal filter (Z6100) to remove out-of-band spurious signals, and then feed to the two-stage IF amplifier circuit (composed of Q6133 and Q6134) for amplification. Finally the amplified signals go to the IF IC for processing 15.2.2 Receiver Back-end Figure 15-3 Diagram of IF Processor The first IF signal (73.35MHz) output by the IF amplifier goes into IF IC via Pin 47, where the signal is...
  • Page 311 Service Manual (U500) for accuracy. 15.3.3 PLL IC The PLL IC (U100) is a fractional frequency divider. The logic IC U101 and U102 work with the PLL IC (U100) to achieve locking. Figure 15-4 Diagram of PLL IC The 19.2MHz frequency generated by the reference oscillator goes into the PLL IC for division, generating the reference frequency.
  • Page 312 Service Manual TX_L_VCO Q103 TX PA Q102 Q107 Q100 TX_H_VCO PLL IC （U100） RX_L_VCO Q110 RX Lo Q109 Q111 Q106 RX_H_VCO Figure 15-5 Diagram of VCO...
  • Page 313 15.4 PCB View MD78X/MD78XG PCB View (Front Panel) Top Layer...
  • Page 314 MD78X/MD78XG PCB View (Front Panel) Bottom Layer...
  • Page 315 MD78X/MD78XG PCB View (Main Board) Top Layer...
  • Page 316 MD78X/MD78XG PCB View (Main Board) Bottom Layer...
  • Page 317 15.5 Block Diagram MD78X/MD78XG Block Diagram (Power Section) Auto baterry Voltage Q802\Q803\U201 13.6 Q804\Q805 9V3A 9V1A Q920\Q921\U914 Q801 Q801 Q6102 9V1A Q902 Q6103 U6000 U703 Q6105 U701 U702 U701 U915 4V3A Q100\Q103\Q106\Q110 Q104 U100 U918 3V3A X100 U905 U500 ON\OFF KEY PWB IGN_SENCE EMERGENCY U231...
  • Page 318 MD78X/MD78XG Block Diagram (RF Section) High Temperature Protection 9V1A_TX Gain:10 dB Gain:15 dB Gain:11dB Tx/Rx Gain:16 dB Gain:-6 dB Switch Tx_PORT Microstrip Attenuator Match Match Match Matcher Microstrip Dual Q804 Harmonic Q805 Q801 Rx_PORT Directional Coupler Driver Filter PreDriver Firststage Switch s Power 9.1V Q802 Q803...
  • Page 319 MD78X/MD78XG Block Diagram (BB Section) IF processor RF Unit BB Schematic Block Diagram TX RX CTL MCSI1 McBSP2 GPIOs TEMP_DET Audio Codec Nor FLASH and pSRAM Headset McBSP1 FLASH: 8Mx16 Driver datax16 pSRAM:2Mx16 TMS320C55x BELL Driver Speed:96MHz(max) Mobile SDRAM McBSP3 128Mb:8Mx16 JTAG JTAG...
  • Page 320 15.6 Schematic Diagram MD78X/MD78XG Schematic Diagram (Audio Circuit) R245 R245 EXT_SPKR+ R253 R253 EXT_SPKR- R293 R293 SPKR1+ R294 R294 SPKR1- L232 L232 BLM18PG300SN1 BLM18PG300SN1 9d3V C232 C232 C233 C233 0.1u 0.1u C285 C285 C284 C284 0.1u 0.1u C234 C234 C235 C235 10uF/25V 10uF/25V...
  • Page 321 MD78X/MD78XG Schematic Diagram (RX Circuit) L6100 L6100 BLM18PG600SN1 BLM18PG600SN1 9V1A_RX C6100 C6100 R6100 R6100 C6102 C6102 C6185 C6185 R6101 R6101 470p 470p R6102 R6102 TRANSISTOR TRANSISTOR L6101 L6101 Q6101 Q6101 BLM18PG600SN1 BLM18PG600SN1 TRANSISTOR TRANSISTOR RF_ATTEN C6103 C6103 220p 220p TX TP TX TP Q6100 Q6100...
  • Page 322 MD78X/MD78XG Schematic Diagram (DAC Circuit) L500 L500 BLM18PG600SN1 BLM18PG600SN1 C471 C471 C405 C405 0.1u 0.1u 10uF/10V 10uF/10V R570 R570 R542 0 R542 0 C484 C484 1000p 1000p C509 C509 C508 C508 C483 C483 C510 C510 R528 R528 8200p 8200p 0.1u 0.1u 100P 100P...
  • Page 323 MD78X/MD78XG Schematic Diagram (Memory Circuit) F_D0 R487 R487 F_D0_LCD F_D1 R489 R489 F_D1_LCD F_D2 R490 R490 F_D2_LCD F_D3 R492 R492 F_D3_LCD F_D4 R515 R515 F_D4_LCD F_D5 R516 R516 F_D5_LCD F_D6 R517 R517 F_D6_LCD F_D7 R518 R518 F_D7_LCD R519 R519 /OE_LCD R520 R520 /WE_LCD...
  • Page 324 MD78X/MD78XG Schematic Diagram (OMAP Circuit) 19.2_OMAP 3V3A R414 R414 R419 R419 C338 C338 C336 C336 C401 C401 0.1u 0.1u 10u/16V 10u/16V 1000p 1000p TP309 TP309 C364 39p C364 39p X302 X302 TP377 TP377 L151 L151 C337 C337 R426 R426 C375 C375 C376 C376...
  • Page 325 MD78X/MD78XG Schematic Diagram (OMAP & GPS Circuit) 3V3D TP326 TP326 R323 R323 R325 R325 U302B U302B OMAP OMAP 3V3D MPUIO2/SPIF.CS1/UWIRE.CS1 LCD.P0 U322 U322 R357 R357 98_PE MPUIO4/SPIF.CS2/UWIRE.CS2/LED2 LCD.P1 R329 R329 R330 R330 R327 R327 DVDD_IO SLC/SPC I2C_SCL 98_PC MPUIO1/SPIF.SCK LCD.P2 R324 R324 R334 10K...
  • Page 326 Peripheral Interface MD78X/MD78XG Schematic Diagram ( Circuit) 3V3D C482 C482 C481 C481 C409 C409 C410 C410 C411 C411 C412 C412 C413 C413 C414 C414 C415 C415 C416 C416 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p J400 J400 100p...
  • Page 327 MD78X/MD78XG Schematic Diagram 40-Pin Interface Circuit) SPK+ SPK+ 3V3D C468 C468 C439 C439 C438 C438 C441 C441 C440 C440 C435 C435 C420 C420 C419 C419 USB_VBUS R494 R494 R555 R555 100p 100p 0.47u 0.47u 0.47u 0.47u 100p 100p 100p 100p 100p 100p 100p...
  • Page 328 MD78X/MD78XG Schematic Diagram (Power Circuit) U900 U900 RP102N331B RP102N331B 3V3D TP4031 TP4031 VOUT TP4032 TP4032 C900 C900 C901 C901 B900 B900 MMBZ6V8ALT1G MMBZ6V8ALT1G D237 D237 U901 U901 C902 C902 D900 D900 RP102N331B RP102N331B 3V3DP TP4035 TP4035 C903 C903 470p/50V 470p/50V VOUT 470uF/25V 470uF/25V...
  • Page 329 MD78X/MD78XG Schematic Diagram (PLL Circuit) 5VA_FGU L156 L156 3.3UH 3.3UH R175 R175 0.1u 0.1u C1010 C1010 C1009 C1009 1000p 1000p 1000p 1000p 1u/16V 1u/16V 3V3A_FGU 601SN1 601SN1 601SN1 601SN1 0.01U 0.01U 0.1u 0.1u 601SN1 601SN1 C121 C121 100p 100p 0.1u 0.1u PLLLD PLLLD...
  • Page 330 MD78X/MD78XG Schematic Diagram (VCO Circuit) R153 R153 601SN1 601SN1 Q101 Q101 EMD22 EMD22 4V3A R142 R142 220p 220p 0.1u 0.1u 3.3k 3.3k 470n 470n R145 R145 TX_VCO_H 220p 220p C195 C195 C194 C194 R143 R143 220p 220p 0.1u 0.1u 6.8k 6.8k L103 L103...
  • Page 331 MD78X/MD78XG Schematic Diagram (IF Circuit) TP703 TP703 TP702 TP702 TP704 TP704 C701 C701 C703 C703 2FLO 2FLO 330n 330n 0.01u 0.01u TP701 TP701 IF-out L716 L716 C743 C743 TEST POINT TEST POINT C702 C702 0.01u 0.01u L701 L701 L702 L702 601S 601S L703...
  • Page 332 MD78X/MD78XG Schematic Diagram ( Circuit) C909 C909 C889 C889 C913 C913 C888 C888 C825 C825 C885 C885 L801 L801 C855 C855 47pF 47pF 470p 470p BLM41PG600SN1 BLM41PG600SN1 W801 W801 100p 100p 3300p 3300p 0.018uF 0.018uF 33pF 33pF C916 C916 C930 C930 C931 C931...
  • Page 333 MD78X/MD78XG Schematic Diagram (Front Panel) 3V3A TP10 TP10 TP11 TP11 TP12 TP12 TP13 TP13 TP14 TP14 TP15 TP15 TP16 TP16 TP17 TP17 MMBZ6V8ALT1G MMBZ6V8ALT1G 100pf 100pf MENU 100pf 100pf 0.1uf 0.1uf DOWN EMI FILTER EMI FILTER UART2_RXD LOGIC IC LOGIC IC PRST BACK UART2_TXD...
  • Page 334 Service Manual 15.7 Parts List Main Board for MD78X/MD78XG Ref. No. Part No. Description C6115 3001050000000 0Ω C6123 3001050000000 0Ω C6172 3001050000000 0Ω R156 3001050000000 0Ω R174 3001050000000 0Ω R188 3001050000000 0Ω R197 3001050000000 0Ω R230 3001050000000 0Ω R233 3001050000000 0Ω...
  • Page 335 Service Manual Ref. No. Part No. Description R894 3001050000000 0Ω R902 3001050000000 0Ω R904 3001050000000 0Ω R920 3001050000000 0Ω R923 3001050000000 0Ω R967 3001050000000 0Ω R983 3001050000000 0Ω C241 3001060000000 0Ω C6158 3001060000000 0Ω C6176 3001060000000 0Ω C843 3001060000000 0Ω R171 3001060000000 0Ω...
  • Page 336 Service Manual Ref. No. Part No. Description R187 3001061000000 10Ω R808 3001061000000 10Ω R953 3001061000000 10Ω R6102 3001071000000 10Ω R122 3001052700010 27Ω R123 3001052700010 27Ω R6121 3001051800000 18Ω R1110 3001053300010 33Ω R167 3001053300010 33Ω R178 3001053300010 33Ω R231 3001053300010 33Ω R232 3001053300010 33Ω...
  • Page 337 Service Manual Ref. No. Part No. Description R430 3001053300010 33Ω R431 3001053300010 33Ω R432 3001053300010 33Ω R433 3001053300010 33Ω R467 3001053300010 33Ω R473 3001053300010 33Ω R474 3001053300010 33Ω R479 3001053300010 33Ω R485 3001053300010 33Ω R486 3001053300010 33Ω R487 3001053300010 33Ω R489 3001053300010 33Ω...
  • Page 338 Service Manual Ref. No. Part No. Description 3001054700000 47Ω R141 3001054700000 47Ω R830 3001074700000 47Ω R6120 3001055100010 51Ω R6132 3001055100010 51Ω R701 3001055100010 51Ω R114 3001065100000 51Ω R111 3001065600000 56Ω R862 3001065600000 56Ω R809 3001068200000 82Ω R829 3001068200000 82Ω R835 3001068200000 82Ω...
  • Page 339 Service Manual Ref. No. Part No. Description R929 3001051010040 100Ω R948 3001051010040 100Ω 3001061010000 100Ω R810 3001061010000 100Ω R814 3001061010000 100Ω R823 3001061010000 100Ω R137 3001061210000 120Ω R139 3001061210000 120Ω R966 3001161510010 150Ω R144 3001061510000 150Ω R6124 3001052710000 270Ω R6125 3001052710000 270Ω...
  • Page 340 Service Manual Ref. No. Part No. Description R6106 3001066810000 680Ω R936 3001066810000 680Ω R958 3001066810000 680Ω R887 3001058210000 820Ω R181 3001051020000 1KΩ R183 3001051020000 1KΩ R264 3001051020000 1KΩ R267 3001051020000 1KΩ R290 3001051020000 1KΩ R295 3001051020000 1KΩ R383 3001051020000 1KΩ R422 3001051020000 1KΩ...
  • Page 341 Service Manual Ref. No. Part No. Description R866 3001052220010 2.2K R909 3001052220010 2.2K R964 3001052220010 2.2K R968 3001052220010 2.2K R972 3001062220000 2.2K R6104 3001052720000 2.7K R450 3001072720010 2.7K R971 3099052741000 2.74kΩ R839 3001053320000 3.3K R890 3001053320000 3.3K R6118 3001053920010 3.9K R132 3001053920000 3.9K...
  • Page 342 Service Manual Ref. No. Part No. Description R577 3001056820000 6.8K R831 3001055620000 5.6K R239 3001055620000 5.6K R287 3001055620000 5.6K R6105 3001055620000 5.6K R716 3001055620000 5.6K R843 3001065620000 5.6K R918 3099066041010 6.04K R131 3001056820010 6.8K R142 3001056820010 6.8K R138 3001057520000 7.5K R143 3001057520000 7.5K...
  • Page 343 Service Manual Ref. No. Part No. Description R385 3001051030000 10KΩ R390 3001051030000 10KΩ R391 3001051030000 10KΩ R392 3001051030000 10KΩ R393 3001051030000 10KΩ R394 3001051030000 10KΩ R400 3001051030000 10KΩ R427 3001051030000 10KΩ R429 3001051030000 10KΩ R438 3001051030000 10KΩ R441 3001051030000 10KΩ R442 3001051030000 10KΩ...
  • Page 344 Service Manual Ref. No. Part No. Description R570 3001051030000 10KΩ R6127 3001051030000 10KΩ R705 3001051030000 10KΩ R709 3001051030000 10KΩ R885 3001051030000 10KΩ R938 3001051030000 10KΩ R945 3001051030000 10KΩ R950 3001051030000 10KΩ R976 3001051030000 10KΩ R979 3001051030000 10KΩ R980 3001051030000 10KΩ R844 3001061030000 10KΩ...
  • Page 345 Service Manual Ref. No. Part No. Description R263 3001053030000 30KΩ R279 3001053030000 30KΩ R283 3001053030000 30KΩ R6134 3001053030000 30KΩ R6137 3001053030000 30KΩ R529 3001053330000 33KΩ R558 3001053330000 33KΩ R559 3001053330000 33KΩ R560 3001053330000 33KΩ R561 3001053330000 33KΩ R562 3001053330000 33KΩ R563 3001053330000 33KΩ...
  • Page 346 Service Manual Ref. No. Part No. Description R895 3001055630000 56KΩ R528 3001056830000 68KΩ R128 3001058230000 82KΩ R892 3001058230000 82KΩ R247 3001051040000 100K R248 3001051040000 100K R252 3001051040000 100K R262 3001051040000 100K R268 3001051040000 100K R269 3001051040000 100K R274 3001051040000 100K R275 3001051040000 100K...
  • Page 347 Service Manual Ref. No. Part No. Description C6122 3101050200010 C6125 3101050200010 C178 3101060200010 C179 3101060200010 C821 3101080200010 3101062590010 2.5PF C6120 3101050300000 C6121 3101050300000 C6126 3101050300000 C6127 3101050300000 C6152 3101050300000 C6124 3101054390010 4.3P C177 3101060300010 3101060300010 3101060300010 C703 3101060300010 3101053690000 3.6PF 3101054090010 C152 3101054090010...
  • Page 348 Service Manual Ref. No. Part No. Description C837 3101080700010 C192 3101060800010 C6114 3101050700050 C6170 3101050900000 3101060900010 C155 3101060900010 C6111 3101051000020 10PF C6112 3101051000020 10PF C6129 3101051000020 10PF C714 3101051000020 10PF C751 3101051000020 10PF 3101061000000 10PF 3101061000000 10PF 3101051000030 10PF 3101051000030 10PF 3101051200020 12PF...
  • Page 349 Service Manual Ref. No. Part No. Description C732 3101052200010 22PF C747 3101052200010 22PF C918 3101052200010 22PF C857 3101062200010 22PF C889 3101062200010 22PF C902 3101062200010 22PF C193 3101052700000 27PF C734 3101053000010 30PF C500 3101053300000 33PF C6160 3101053300000 33PF C1004 3101063300000 33PF C803 3101063300000 33PF...
  • Page 350 Service Manual Ref. No. Part No. Description C6139 3101056800000 68PF C6140 3101056800000 68PF C6141 3101056800000 68PF C6142 3101056800000 68PF C6143 3101056800000 68PF C362 3101058200000 82PF C363 3101058200000 82PF C365 3101058200000 82PF C121 3101051010030 100PF C1320 3101051010030 100PF C256 3101051010030 100PF C288 3101051010030 100PF...
  • Page 351 Service Manual Ref. No. Part No. Description C410 3101051010030 100PF C411 3101051010030 100PF C412 3101051010030 100PF C413 3101051010030 100PF C414 3101051010030 100PF C415 3101051010030 100PF C416 3101051010030 100PF C417 3101051010030 100PF C418 3101051010030 100PF C419 3101051010030 100PF C420 3101051010030 100PF C426 3101051010030 100PF...
  • Page 352 Service Manual Ref. No. Part No. Description C478 3101051010030 100PF C479 3101051010030 100PF C480 3101051010030 100PF C481 3101051010030 100PF C482 3101051010030 100PF C510 3101051010030 100PF C516 3101051010030 100PF C517 3101051010030 100PF C518 3101051010030 100PF C6130 3101051010030 100PF C6166 3101051010030 100PF C721 3101051010030 100PF...
  • Page 353 Service Manual Ref. No. Part No. Description C247 3101052210010 220PF C250 3101052210010 220PF C254 3101052210010 220PF C265 3101052210010 220PF C269 3101052210010 220PF C270 3101052210010 220PF C271 3101052210010 220PF C272 3101052210010 220PF C273 3101052210010 220PF 3101052210010 220PF C280 3101052210010 220PF 3101052210010 220PF C421 3101052210010...
  • Page 354 Service Manual Ref. No. Part No. Description C853 3101062210000 220PF C877 3101062210000 220PF C878 3101062210000 220PF C892 3101062210000 220PF 3101052710000 270PF C501 3101053310020 330PF C505 3101053310020 330PF C911 3101053310020 330PF C1001 3101054710010 470PF C1003 3101054710010 470PF C1015 3101054710010 470PF C142 3101054710010 470PF C148...
  • Page 355 Service Manual Ref. No. Part No. Description C728 3101051020010 1000PF 3101051020010 1000PF 3101051020010 1000PF 3101051020010 1000PF C910 3101051020010 1000PF C937 3101051020010 1000PF C944 3101051020010 1000PF 3101051020010 1000PF C839 3101061020040 1000PF C887 3101061020040 1000PF C801 3101081020010 1000PF C502 3101053320010 3300PF C802 3101063320000 3300PF C916...
  • Page 356 Service Manual Ref. No. Part No. Description C141 3101051040010 0.1UF C149 3101051040010 0.1UF C163 3101051040010 0.1UF C167 3101051040010 0.1UF C195 3101051040010 0.1UF C232 3101051040010 0.1UF C233 3101051040010 0.1UF C236 3101051040010 0.1UF C239 3101051040010 0.1UF 3101051040010 0.1UF C240 3101051040010 0.1UF C243 3101051040010 0.1UF C248...
  • Page 357 Service Manual Ref. No. Part No. Description 1010 C473 3101051040010 0.1UF 1011 C509 3101051040010 0.1UF 1012 C512 3101051040010 0.1UF 1013 C514 3101051040010 0.1UF 1014 C515 3101051040010 0.1UF 1015 C6104 3101051040010 0.1UF 1016 C6113 3101051040010 0.1UF 1017 C6168 3101051040010 0.1UF 1018 C6169 3101051040010 0.1UF...
  • Page 358 Service Manual Ref. No. Part No. Description 1054 C283 3101061040010 0.1UF 1055 C289 3101061040010 0.1UF 1056 C6193 3101061040010 0.1UF 1057 C748 3101061040010 0.1UF 1058 C829 3101061040010 0.1UF 1059 C854 3101061040010 0.1UF 1060 C868 3101061040010 0.1UF 1061 C907 3101061040010 0.1UF 1062 C927 3101061040010 0.1UF...
  • Page 359 Service Manual Ref. No. Part No. Description 1098 C305 3101051050000 1099 C310 3101051050000 1100 C719 3101051050000 1101 C962 3101051050000 1102 C200 3101061050020 1103 C238 3101061050020 1104 C249 3101061050020 1105 C251 3101061050020 1106 C252 3101061050020 1107 C253 3101061050020 1108 C257 3101061050020 1109 C259 3101061050020...
  • Page 360 Service Manual Ref. No. Part No. Description 1142 C946 3101061050020 1143 C966 3101061050020 1144 C718 3101051050160 1145 C750 3101071050020 1146 C1009 3104071050070 1147 3104071050070 1148 C933 3104082260070 22uF 1149 C920 3101062250000 2.2UF 1150 C932 3101062250000 2.2UF 1151 C934 3101062250000 2.2UF 1152 C965 3101062250000...
  • Page 361 Service Manual Ref. No. Part No. Description 1186 L814 3212106689000 6.8nH 1187 L832 3212106100000 10nH 1188 L811 3215006100010 10nH 1189 L173 3212106120000 12nH 1190 L105 3237199120000 12.5nH 1191 L114 3237199120000 12.5nH 1192 L171 3210306150000 15nH 1193 C826 3210306180000 18nH 1194 L122 3210306180000 18nH...
  • Page 362 Service Manual Ref. No. Part No. Description 1230 L110 3217607471000 470nH 1231 L112 3217607471000 470nH 1232 L116 3217607471000 470nH 1233 L117 3217607471000 470nH 1234 L118 3217607471000 470nH 1235 L121 3217607471000 470nH 1236 L127 3217607471000 470nH 1237 L129 3217607471000 470nH 1238 L133 3217607471000 470nH...
  • Page 363 Service Manual Ref. No. Part No. Description 1274 L801 3221513600000 Bead 1275 L802 3221513600000 Bead 1276 L803 3221513600000 Bead 1277 L900 3221513600000 Bead 1278 L916 3221513600000 Bead 1279 L917 3221513600000 Bead 1280 L940 3221513600000 Bead 1281 L232 3221506300000 Bead 1282 L401 3221506300000 Bead...
  • Page 364 Service Manual Ref. No. Part No. Description 1318 L156 3213212332000 3.3uH 1319 L715 3213212332000 3.3uH 1320 L717 3212206682000 6.8uH 1321 L903 3213099472000 4.7uH 1322 L931 3213099472000 4.7uH 1323 L902 3217299103000 10uH 1324 L930 3241799103000 10uH 1325 L704 3213212103000 10uH 1326 L705 3213212103000 10uH...
  • Page 365 Service Manual Ref. No. Part No. Description 1362 D241 3302031100010 Zener diode 1363 D409 3310240000040 ESD protection diode 1364 D237 3310990000090 ESD protection diode 1365 D238 3310990000090 ESD protection diode 1366 D407 3399040600010 ESD protection diode 1367 D408 3399040600010 ESD protection diode 1368 D450 3699037000010...
  • Page 366 Service Manual Ref. No. Part No. Description 1406 Q117 3403999000000 Transistor 1407 Q102 3401002000990 NPN transistor 1408 Q111 3401002000990 NPN transistor 1409 Q104 3403003000060 NPN transistor 1410 Q702 3403003000060 NPN transistor 1411 Q107 3404006000000 NPN transistor 1412 Q109 3404006000000 NPN transistor 1413 Q6104 3404006000000...
  • Page 367 Service Manual Ref. No. Part No. Description 1450 Q804 3504990000030 PA MOSFET 1451 Q805 3504990000010 PA MOSFET 1452 Q810 3403002000000 PNP transistor 1453 Q902 3403002000000 PNP transistor 1454 Q400 3413001000010 PNP transistor 1455 Q906 3414001000020 NPN transistor 1456 Q910 3414001000020 NPN transistor 1457 Q909...
  • Page 368 Service Manual Ref. No. Part No. Description 1494 X302 3701019250040 Crystal oscillator (19.2MHz) 1495 X375 3701327610060 Crystal 1496 Z6100 3802733540030 Crystal filter 1497 F900 4099000000050 Fuse 1498 J400 5201020100110 Board-to-board connector 1499 J404 5206040200010 FFC connector 1500 41MD7801000F0 1501 6202010000000 APC shielding mask 1502 6201928000000...
  • Page 369 Service Manual Ref. No. Part No. Description 1538 R818 3001081000000 10Ω 1539 R861 3001081000000 10Ω 1540 R855 3001085100000 51Ω 1541 R856 3001085100000 51Ω 1542 C866 3101062710000 270PF 1543 C861 3101068200000 82PF 1544 C816 3101080300010 1545 C835 3101080300010 1546 C851 3101080300010 1547 L823 3210306339000...
  • Page 370 Service Manual 15.8 Troubleshooting Flow Chart Receiver Circuit...
  • Page 371 Service Manual Description of Normal Situations: [1] During sensitivity test, use a communication test set to demodulate the audio signal (TP4012 and TP4016). If the signal is demodulated normally, it is concluded that the front panel is defective. [2] Use the communication test set to input a 73.35MHz IF signal at the mixer, and see whether it can be processed normally afterwards.
  • Page 372 Service Manual Transmitter Circuit...
  • Page 373 Service Manual Description of Normal Situations: [1] The current in analog mode is above 6A under 45W power supply and above 1A under 5W. However, in digital mode, the current will be reduced by 50%. [2] The APC voltage should be above 2V at TP811. [3] Check whether there is an appropriate TX LO signal at TP803.
  • Page 374 Service Manual...
  • Page 375 Service Manual Description of Normal Situations: [1] Detect the oscillation frequency of RX TP123 and TX TP111 using a spectrum analyzer. [2] Check whether switches (Q108, Q112, Q101 and Q105) are turned on and output 3.6V. [3] Check whether the emitter voltage of the four transistors (Q106, Q110, Q100 and Q103) is about 1.8V under normal RX/TX status.
  • Page 376 Service Manual 16. UHF3 (350-400MHz 45W) Information 16.1 Transmitter Circuit The transmitter circuit is composed of power amplifier circuit and power control circuit. The former is used to amplify the VCO signal to the desired output power level, while the latter can keep the output power at the desired level, so as to protect the power amplifier from damage caused by over heat, antenna mismatch, and out-of-range voltage (over voltage or under voltage may result in damage to Q801, Q805, Q804, Q802 and Q803).
  • Page 377 Service Manual The driver power amplifier is formed by Q804, with variable gain controlled by voltage VGG. The maximum output power is 38.5dBm, and the maximum variable gain is 11dB. 16.1.5 Final Power Amplifier The final power amplifier comprises Q802 and Q803, with the maximum output power of 48.5dBm, and the maximum variable gain of 10dB.
  • Page 378 Service Manual to output a voltage VGG, which can control both gate voltage and gain of Q804 and Q805, ensuring a constant power output. 16.1.10 Thermal and Over-voltage Protections The circuit consists of thermistor RT804 and resistor R884. The output voltage is proportional to the detected temperature.
  • Page 379 Service Manual out-of-band spurious signals, and then feed to the two-stage IF amplifier circuit (composed of Q6133 and Q6134) for amplification. Finally the amplified signals go to the IF IC for processing 16.2.2 Receiver Back-end Figure 16-3 Diagram of IF Processor The first IF signal (73.35MHz) output by the IF amplifier goes into IF IC via Pin 47, where the signal is converted to the second IF signal (2.25MHz).
  • Page 380 Service Manual 16.3.3 PLL IC The PLL IC (U100) is a fractional frequency divider. The logic IC U101 and U102 work with the PLL IC (U100) to achieve locking. Figure 16-4 Diagram of PLL IC The 19.2MHz frequency generated by the reference oscillator goes into the PLL IC for division, generating the reference frequency.
  • Page 381 Service Manual TX_L_VCO Q103 TX PA Q102 Q107 Q100 TX_H_VCO PLL IC （U100） RX_L_VCO Q110 RX Lo Q109 Q111 Q106 RX_H_VCO Figure 16-5 Diagram of VCO...
  • Page 382 16.4 PCB View MD78X/MD78XG PCB View (Front Panel) Top Layer...
  • Page 383 MD78X/MD78XG PCB View (Front Panel) Bottom Layer...
  • Page 384 MD78X/MD78XG PCB View (Main Board) Top Layer...
  • Page 385 PCB View (Main Board) MD78X/MD78XG Bottom Layer...
  • Page 386 16.5 Block Diagram MD78X/MD78XG Block Diagram (Power Section) Auto baterry Voltage Q802\Q803\U201 13.6 Q804\Q805 9V3A 9V1A Q920\Q921\U914 Q801 Q801 Q6102 9V1A Q902 Q6103 U6000 U703 Q6105 U701 U702 U701 U915 4V3A Q100\Q103\Q106\Q110 Q104 U100 U918 3V3A X100 U905 U500 ON\OFF KEY PWB IGN_SENCE EMERGENCY U231...
  • Page 387 MD78X/MD78XG Block Diagram (RF Section) High Temperature Protection 9V1A_TX Gain:10 dB Gain:11dB Gain:15 dB Tx/Rx Gain:16 dB Switch Gain:-6 dB Tx_PORT Microstrip Attenuator Match Match Match Matcher Microstrip Dual Q804 Harmonic Q805 Q801 Rx_PORT Directional Coupler Driver Filter PreDriver Firststage Switch s Power 9.1V Q802 Q803...
  • Page 388 MD78X/MD78XG Block Diagram (BB Section) IF processor RF Unit BB Schematic Block Diagram TX RX CTL MCSI1 McBSP2 GPIOs TEMP_DET Audio Codec Nor FLASH and pSRAM Headset McBSP1 FLASH: 8Mx16 Driver datax16 pSRAM:2Mx16 TMS320C55x BELL Driver Speed:96MHz(max) Mobile SDRAM McBSP3 128Mb:8Mx16 JTAG JTAG...
  • Page 389 16.6 Schematic Diagram MD78X/MD78XG Schematic Diagram (Audio Circuit) R245 R245 EXT_SPKR+ R253 R253 EXT_SPKR- R293 R293 SPKR1+ R294 R294 SPKR1- L232 L232 BLM18PG300SN1 BLM18PG300SN1 9d3V C232 C232 C233 C233 0.1u 0.1u C285 C285 C284 C284 0.1u 0.1u C234 C234 C235 C235 10uF/25V 10uF/25V...
  • Page 390 MD78X/MD78XG Schematic Diagram (RX Circuit) L6100 L6100 BLM18PG600SN1 BLM18PG600SN1 9V1A_RX C6100 C6100 R6100 R6100 C6102 C6102 C6185 C6185 R6101 R6101 470p 470p R6102 R6102 TRANSISTOR TRANSISTOR L6101 L6101 Q6101 Q6101 BLM18PG600SN1 BLM18PG600SN1 TRANSISTOR TRANSISTOR RF_ATTEN C6103 C6103 220p 220p TX TP TX TP Q6100 Q6100...
  • Page 391 MD78X/MD78XG Schematic Diagram (DAC Circuit) L500 L500 BLM18PG600SN1 BLM18PG600SN1 C471 C471 C405 C405 0.1u 0.1u 10uF/10V 10uF/10V R570 R570 R542 0 R542 0 C484 C484 1000p 1000p C509 C509 C508 C508 C483 C483 C510 C510 R528 R528 8200p 8200p 0.1u 0.1u 100P 100P...
  • Page 392 MD78X/MD78XG Schematic Diagram (Memory Circuit) F_D0 R487 R487 F_D0_LCD F_D1 R489 R489 F_D1_LCD F_D2 R490 R490 F_D2_LCD F_D3 R492 R492 F_D3_LCD F_D4 R515 R515 F_D4_LCD F_D5 R516 R516 F_D5_LCD F_D6 R517 R517 F_D6_LCD F_D7 R518 R518 F_D7_LCD R519 R519 /OE_LCD R520 R520 /WE_LCD...
  • Page 393 MD78X/MD78XG Schematic Diagram (OMAP Circuit) 19.2_OMAP 3V3A R414 R414 R419 R419 C338 C338 C336 C336 C401 C401 0.1u 0.1u 10u/16V 10u/16V 1000p 1000p TP309 TP309 C364 39p C364 39p X302 X302 TP377 TP377 L151 L151 C337 C337 R426 R426 C375 C375 C376 C376...
  • Page 394 MD78X/MD78XG Schematic Diagram (OMAP & GPS Circuit) 3V3D TP326 TP326 R323 R323 R325 R325 U302B U302B OMAP OMAP 3V3D MPUIO2/SPIF.CS1/UWIRE.CS1 LCD.P0 U322 U322 R357 R357 98_PE MPUIO4/SPIF.CS2/UWIRE.CS2/LED2 LCD.P1 R329 R329 R330 R330 R327 R327 DVDD_IO SLC/SPC I2C_SCL 98_PC MPUIO1/SPIF.SCK LCD.P2 R324 R324 R334 10K...
  • Page 395 Peripheral Interface MD78X/MD78XG Schematic Diagram ( Circuit) 3V3D C482 C482 C481 C481 C409 C409 C410 C410 C411 C411 C412 C412 C413 C413 C414 C414 C415 C415 C416 C416 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p J400 J400 100p...
  • Page 396 MD78X/MD78XG Schematic Diagram 40-Pin Interface Circuit) SPK+ SPK+ 3V3D C468 C468 C439 C439 C438 C438 C441 C441 C440 C440 C435 C435 C420 C420 C419 C419 USB_VBUS R494 R494 R555 R555 100p 100p 0.47u 0.47u 0.47u 0.47u 100p 100p 100p 100p 100p 100p 100p...
  • Page 397 MD78X/MD78XG Schematic Diagram (Power Circuit) U900 U900 RP102N331B RP102N331B 3V3D TP4031 TP4031 VOUT TP4032 TP4032 C900 C900 C901 C901 B900 B900 MMBZ6V8ALT1G MMBZ6V8ALT1G D237 D237 U901 U901 C902 C902 D900 D900 RP102N331B RP102N331B 3V3DP TP4035 TP4035 C903 C903 470p/50V 470p/50V VOUT 470uF/25V 470uF/25V...
  • Page 398 MD78X/MD78XG Schematic Diagram (PLL Circuit) 5VA_FGU L156 L156 3.3UH 3.3UH R175 R175 0.1u 0.1u C1010 C1010 C1009 C1009 1000p 1000p 1000p 1000p 1u/16V 1u/16V 3V3A_FGU 601SN1 601SN1 601SN1 601SN1 0.01U 0.01U 0.1u 0.1u 601SN1 601SN1 C121 C121 100p 100p 0.1u 0.1u PLLLD PLLLD...
  • Page 399 MD78X/MD78XG Schematic Diagram (VCO Circuit) R153 R153 601SN1 601SN1 Q101 Q101 EMD22 EMD22 4V3A R142 R142 220p 220p 0.1u 0.1u 3.3k 3.3k 470n 470n R145 R145 TX_VCO_H 220p 220p C195 C195 C194 C194 R143 R143 220p 220p 0.1u 0.1u 6.8k 6.8k L103 L103...
  • Page 400 MD78X/MD78XG Schematic Diagram (IF Circuit) TP703 TP703 TP702 TP702 TP704 TP704 C701 C701 C703 C703 2FLO 2FLO 330n 330n 0.01u 0.01u TP701 TP701 IF-out L716 L716 C743 C743 TEST POINT TEST POINT C702 C702 0.01u 0.01u L701 L701 L702 L702 601S 601S L703...
  • Page 401 MD78X/MD78XG Schematic Diagram ( Circuit) C909 C909 C889 C889 C913 C913 C888 C888 C825 C825 C885 C885 L801 L801 C855 C855 47pF 47pF 470p 470p BLM41PG600SN1 BLM41PG600SN1 W801 W801 100p 100p 3300p 3300p 0.018uF 0.018uF 33pF 33pF C916 C916 C930 C930 C931 C931...
  • Page 402 MD78X/MD78XG Schematic Diagram (Front Panel) 3V3A TP10 TP10 TP11 TP11 TP12 TP12 TP13 TP13 TP14 TP14 TP15 TP15 TP16 TP16 TP17 TP17 MMBZ6V8ALT1G MMBZ6V8ALT1G 100pf 100pf MENU 100pf 100pf 0.1uf 0.1uf DOWN EMI FILTER EMI FILTER UART2_RXD LOGIC IC LOGIC IC PRST BACK UART2_TXD...
  • Page 403 Service Manual 16.7 Parts List Main Board for MD78X/MD78XG Ref. No. Part No. Description C6115 3001050000000 0Ω C6123 3001050000000 0Ω C6172 3001050000000 0Ω R156 3001050000000 0Ω R174 3001050000000 0Ω R188 3001050000000 0Ω R197 3001050000000 0Ω R230 3001050000000 0Ω R233 3001050000000 0Ω...
  • Page 404 Service Manual Ref. No. Part No. Description R894 3001050000000 0Ω R902 3001050000000 0Ω R904 3001050000000 0Ω R920 3001050000000 0Ω R923 3001050000000 0Ω R967 3001050000000 0Ω R983 3001050000000 0Ω C241 3001060000000 0Ω C6158 3001060000000 0Ω C6176 3001060000000 0Ω C843 3001060000000 0Ω R171 3001060000000 0Ω...
  • Page 405 Service Manual Ref. No. Part No. Description R187 3001061000000 10Ω R808 3001061000000 10Ω R953 3001061000000 10Ω R6102 3001071000000 10Ω R122 3001052700010 27Ω R123 3001052700010 27Ω R6121 3001051800000 18Ω R1110 3001053300010 33Ω R167 3001053300010 33Ω R178 3001053300010 33Ω R231 3001053300010 33Ω R232 3001053300010 33Ω...
  • Page 406 Service Manual Ref. No. Part No. Description R430 3001053300010 33Ω R431 3001053300010 33Ω R432 3001053300010 33Ω R433 3001053300010 33Ω R467 3001053300010 33Ω R473 3001053300010 33Ω R474 3001053300010 33Ω R479 3001053300010 33Ω R485 3001053300010 33Ω R486 3001053300010 33Ω R487 3001053300010 33Ω R489 3001053300010 33Ω...
  • Page 407 Service Manual Ref. No. Part No. Description 3001054700000 47Ω R141 3001054700000 47Ω R830 3001074700000 47Ω R6120 3001055100010 51Ω R6132 3001055100010 51Ω R701 3001055100010 51Ω R114 3001065100000 51Ω R111 3001065600000 56Ω R862 3001065600000 56Ω R809 3001068200000 82Ω R829 3001068200000 82Ω R835 3001068200000 82Ω...
  • Page 408 Service Manual Ref. No. Part No. Description R929 3001051010040 100Ω R948 3001051010040 100Ω 3001061010000 100Ω R810 3001061010000 100Ω R814 3001061010000 100Ω R823 3001061010000 100Ω R137 3001061210000 120Ω R139 3001061210000 120Ω R966 3001161510010 150Ω R144 3001061510000 150Ω R6124 3001052710000 270Ω R6125 3001052710000 270Ω...
  • Page 409 Service Manual Ref. No. Part No. Description R6106 3001066810000 680Ω R936 3001066810000 680Ω R958 3001066810000 680Ω R887 3001058210000 820Ω R181 3001051020000 1KΩ R183 3001051020000 1KΩ R264 3001051020000 1KΩ R267 3001051020000 1KΩ R290 3001051020000 1KΩ R295 3001051020000 1KΩ R383 3001051020000 1KΩ R422 3001051020000 1KΩ...
  • Page 410 Service Manual Ref. No. Part No. Description R866 3001052220010 2.2K R909 3001052220010 2.2K R964 3001052220010 2.2K R968 3001052220010 2.2K R972 3001062220000 2.2K R6104 3001052720000 2.7K R450 3001072720010 2.7K R971 3099052741000 2.74kΩ R839 3001053320000 3.3K R890 3001053320000 3.3K R6118 3001053920010 3.9K R132 3001053920000 3.9K...
  • Page 411 Service Manual Ref. No. Part No. Description R577 3001056820000 6.8K R831 3001055620000 5.6K R239 3001055620000 5.6K R287 3001055620000 5.6K R6105 3001055620000 5.6K R716 3001055620000 5.6K R843 3001065620000 5.6K R918 3099066041010 6.04K R131 3001056820010 6.8K R142 3001056820010 6.8K R138 3001057520000 7.5K R143 3001057520000 7.5K...
  • Page 412 Service Manual Ref. No. Part No. Description R385 3001051030000 10KΩ R390 3001051030000 10KΩ R391 3001051030000 10KΩ R392 3001051030000 10KΩ R393 3001051030000 10KΩ R394 3001051030000 10KΩ R400 3001051030000 10KΩ R427 3001051030000 10KΩ R429 3001051030000 10KΩ R438 3001051030000 10KΩ R441 3001051030000 10KΩ R442 3001051030000 10KΩ...
  • Page 413 Service Manual Ref. No. Part No. Description R570 3001051030000 10KΩ R6127 3001051030000 10KΩ R705 3001051030000 10KΩ R709 3001051030000 10KΩ R885 3001051030000 10KΩ R938 3001051030000 10KΩ R945 3001051030000 10KΩ R950 3001051030000 10KΩ R976 3001051030000 10KΩ R979 3001051030000 10KΩ R980 3001051030000 10KΩ R844 3001061030000 10KΩ...
  • Page 414 Service Manual Ref. No. Part No. Description R263 3001053030000 30KΩ R279 3001053030000 30KΩ R283 3001053030000 30KΩ R6134 3001053030000 30KΩ R6137 3001053030000 30KΩ R529 3001053330000 33KΩ R558 3001053330000 33KΩ R559 3001053330000 33KΩ R560 3001053330000 33KΩ R561 3001053330000 33KΩ R562 3001053330000 33KΩ R563 3001053330000 33KΩ...
  • Page 415 Service Manual Ref. No. Part No. Description R895 3001055630000 56KΩ R528 3001056830000 68KΩ R128 3001058230000 82KΩ R892 3001058230000 82KΩ R247 3001051040000 100K R248 3001051040000 100K R252 3001051040000 100K R262 3001051040000 100K R268 3001051040000 100K R269 3001051040000 100K R274 3001051040000 100K R275 3001051040000 100K...
  • Page 416 Service Manual Ref. No. Part No. Description C6122 3101050200010 C6125 3101050200010 C178 3101060200010 C179 3101060200010 C821 3101080200010 3101062590010 2.5PF C6120 3101050300000 C6121 3101050300000 C6126 3101050300000 C6127 3101050300000 C6152 3101050300000 C6124 3101054390010 4.3P C177 3101060300010 3101060300010 3101060300010 C703 3101060300010 3101053690000 3.6PF 3101054090010 C152 3101054090010...
  • Page 417 Service Manual Ref. No. Part No. Description C837 3101080700010 C192 3101060800010 C6114 3101050700050 C6170 3101050900000 3101060900010 C155 3101060900010 C6111 3101051000020 10PF C6112 3101051000020 10PF C6129 3101051000020 10PF C714 3101051000020 10PF C751 3101051000020 10PF 3101061000000 10PF 3101061000000 10PF 3101051000030 10PF 3101051000030 10PF 3101051200020 12PF...
  • Page 418 Service Manual Ref. No. Part No. Description C732 3101052200010 22PF C747 3101052200010 22PF C918 3101052200010 22PF C857 3101062200010 22PF C889 3101062200010 22PF C902 3101062200010 22PF C193 3101052700000 27PF C734 3101053000010 30PF C500 3101053300000 33PF C6160 3101053300000 33PF C1004 3101063300000 33PF C803 3101063300000 33PF...
  • Page 419 Service Manual Ref. No. Part No. Description C6139 3101056800000 68PF C6140 3101056800000 68PF C6141 3101056800000 68PF C6142 3101056800000 68PF C6143 3101056800000 68PF C362 3101058200000 82PF C363 3101058200000 82PF C365 3101058200000 82PF C121 3101051010030 100PF C1320 3101051010030 100PF C256 3101051010030 100PF C288 3101051010030 100PF...
  • Page 420 Service Manual Ref. No. Part No. Description C410 3101051010030 100PF C411 3101051010030 100PF C412 3101051010030 100PF C413 3101051010030 100PF C414 3101051010030 100PF C415 3101051010030 100PF C416 3101051010030 100PF C417 3101051010030 100PF C418 3101051010030 100PF C419 3101051010030 100PF C420 3101051010030 100PF C426 3101051010030 100PF...
  • Page 421 Service Manual Ref. No. Part No. Description C478 3101051010030 100PF C479 3101051010030 100PF C480 3101051010030 100PF C481 3101051010030 100PF C482 3101051010030 100PF C510 3101051010030 100PF C516 3101051010030 100PF C517 3101051010030 100PF C518 3101051010030 100PF C6130 3101051010030 100PF C6166 3101051010030 100PF C721 3101051010030 100PF...
  • Page 422 Service Manual Ref. No. Part No. Description C247 3101052210010 220PF C250 3101052210010 220PF C254 3101052210010 220PF C265 3101052210010 220PF C269 3101052210010 220PF C270 3101052210010 220PF C271 3101052210010 220PF C272 3101052210010 220PF C273 3101052210010 220PF 3101052210010 220PF C280 3101052210010 220PF 3101052210010 220PF C421 3101052210010...
  • Page 423 Service Manual Ref. No. Part No. Description C853 3101062210000 220PF C877 3101062210000 220PF C878 3101062210000 220PF C892 3101062210000 220PF 3101052710000 270PF C501 3101053310020 330PF C505 3101053310020 330PF C911 3101053310020 330PF C1001 3101054710010 470PF C1003 3101054710010 470PF C1015 3101054710010 470PF C142 3101054710010 470PF C148...
  • Page 424 Service Manual Ref. No. Part No. Description C728 3101051020010 1000PF 3101051020010 1000PF 3101051020010 1000PF 3101051020010 1000PF C910 3101051020010 1000PF C937 3101051020010 1000PF C944 3101051020010 1000PF 3101051020010 1000PF C839 3101061020040 1000PF C887 3101061020040 1000PF C801 3101081020010 1000PF C502 3101053320010 3300PF C802 3101063320000 3300PF C916...
  • Page 425 Service Manual Ref. No. Part No. Description C141 3101051040010 0.1UF C149 3101051040010 0.1UF C163 3101051040010 0.1UF C167 3101051040010 0.1UF C195 3101051040010 0.1UF C232 3101051040010 0.1UF C233 3101051040010 0.1UF C236 3101051040010 0.1UF C239 3101051040010 0.1UF 3101051040010 0.1UF C240 3101051040010 0.1UF C243 3101051040010 0.1UF C248...
  • Page 426 Service Manual Ref. No. Part No. Description 1010 C473 3101051040010 0.1UF 1011 C509 3101051040010 0.1UF 1012 C512 3101051040010 0.1UF 1013 C514 3101051040010 0.1UF 1014 C515 3101051040010 0.1UF 1015 C6104 3101051040010 0.1UF 1016 C6113 3101051040010 0.1UF 1017 C6168 3101051040010 0.1UF 1018 C6169 3101051040010 0.1UF...
  • Page 427 Service Manual Ref. No. Part No. Description 1054 C283 3101061040010 0.1UF 1055 C289 3101061040010 0.1UF 1056 C6193 3101061040010 0.1UF 1057 C748 3101061040010 0.1UF 1058 C829 3101061040010 0.1UF 1059 C854 3101061040010 0.1UF 1060 C868 3101061040010 0.1UF 1061 C907 3101061040010 0.1UF 1062 C927 3101061040010 0.1UF...
  • Page 428 Service Manual Ref. No. Part No. Description 1098 C305 3101051050000 1099 C310 3101051050000 1100 C719 3101051050000 1101 C962 3101051050000 1102 C200 3101061050020 1103 C238 3101061050020 1104 C249 3101061050020 1105 C251 3101061050020 1106 C252 3101061050020 1107 C253 3101061050020 1108 C257 3101061050020 1109 C259 3101061050020...
  • Page 429 Service Manual Ref. No. Part No. Description 1142 C946 3101061050020 1143 C966 3101061050020 1144 C718 3101051050160 1145 C750 3101071050020 1146 C1009 3104071050070 1147 3104071050070 1148 C933 3104082260070 22uF 1149 C920 3101062250000 2.2UF 1150 C932 3101062250000 2.2UF 1151 C934 3101062250000 2.2UF 1152 C965 3101062250000...
  • Page 430 Service Manual Ref. No. Part No. Description 1186 L814 3212106689000 6.8nH 1187 L832 3212106100000 10nH 1188 L811 3215006100010 10nH 1189 L173 3212106120000 12nH 1190 L105 3237199120000 12.5nH 1191 L114 3237199120000 12.5nH 1192 L171 3210306150000 15nH 1193 C826 3210306180000 18nH 1194 L122 3210306180000 18nH...
  • Page 431 Service Manual Ref. No. Part No. Description 1230 L110 3217607471000 470nH 1231 L112 3217607471000 470nH 1232 L116 3217607471000 470nH 1233 L117 3217607471000 470nH 1234 L118 3217607471000 470nH 1235 L121 3217607471000 470nH 1236 L127 3217607471000 470nH 1237 L129 3217607471000 470nH 1238 L133 3217607471000 470nH...
  • Page 432 Service Manual Ref. No. Part No. Description 1274 L801 3221513600000 Bead 1275 L802 3221513600000 Bead 1276 L803 3221513600000 Bead 1277 L900 3221513600000 Bead 1278 L916 3221513600000 Bead 1279 L917 3221513600000 Bead 1280 L940 3221513600000 Bead 1281 L232 3221506300000 Bead 1282 L401 3221506300000 Bead...
  • Page 433 Service Manual Ref. No. Part No. Description 1318 L156 3213212332000 3.3uH 1319 L715 3213212332000 3.3uH 1320 L717 3212206682000 6.8uH 1321 L903 3213099472000 4.7uH 1322 L931 3213099472000 4.7uH 1323 L902 3217299103000 10uH 1324 L930 3241799103000 10uH 1325 L704 3213212103000 10uH 1326 L705 3213212103000 10uH...
  • Page 434 Service Manual Ref. No. Part No. Description 1362 D241 3302031100010 Zener diode 1363 D409 3310240000040 ESD protection diode 1364 D237 3310990000090 ESD protection diode 1365 D238 3310990000090 ESD protection diode 1366 D407 3399040600010 ESD protection diode 1367 D408 3399040600010 ESD protection diode 1368 D450 3699037000010...
  • Page 435 Service Manual Ref. No. Part No. Description 1406 Q117 3403999000000 Transistor 1407 Q102 3401002000990 NPN transistor 1408 Q111 3401002000990 NPN transistor 1409 Q104 3403003000060 NPN transistor 1410 Q702 3403003000060 NPN transistor 1411 Q107 3404006000000 NPN transistor 1412 Q109 3404006000000 NPN transistor 1413 Q6104 3404006000000...
  • Page 436 Service Manual Ref. No. Part No. Description 1450 Q804 3504990000030 PA MOSFET 1451 Q805 3504990000010 PA MOSFET 1452 Q810 3403002000000 PNP transistor 1453 Q902 3403002000000 PNP transistor 1454 Q400 3413001000010 PNP transistor 1455 Q906 3414001000020 NPN transistor 1456 Q910 3414001000020 NPN transistor 1457 Q909...
  • Page 437 Service Manual Ref. No. Part No. Description 1494 X302 3701019250040 Crystal oscillator (19.2MHz) 1495 X375 3701327610060 Crystal 1496 Z6100 3802733540030 Crystal filter 1497 F900 4099000000050 Fuse 1498 J400 5201020100110 Board-to-board connector 1499 J404 5206040200010 FFC connector 1500 41MD7801000F0 1501 6202010000000 APC shielding mask 1502 6201928000000...
  • Page 438 Service Manual Ref. No. Part No. Description 1538 R818 3001081000000 10Ω 1539 R861 3001081000000 10Ω 1540 R855 3001085100000 51Ω 1541 R856 3001085100000 51Ω 1542 C866 3101062710000 270PF 1543 C861 3101068200000 82PF 1544 C816 3101080300010 1545 C835 3101080300010 1546 C851 3101080300010 1547 L823 3210306339000...
  • Page 439 Service Manual 16.8 Troubleshooting Flow Chart Receiver Circuit...
  • Page 440 Service Manual Description of Normal Situations: [1] During sensitivity test, use a communication test set to demodulate the audio signal (TP4012 and TP4016). If the signal is demodulated normally, it is concluded that the front panel is defective. [2] Use the communication test set to input a 73.35MHz IF signal at the mixer, and see whether it can be processed normally afterwards.
  • Page 441 Service Manual Transmitter Circuit...
  • Page 442 Service Manual Description of Normal Situations: [1] The current in analog mode is above 6A under 45W power supply and above 1A under 5W. However, in digital mode, the current will be reduced by 50%. [2] The APC voltage should be above 2V at TP811. [3] Check whether there is an appropriate TX LO signal at TP803.
  • Page 443 Service Manual...
  • Page 444 Service Manual Description of Normal Situations: [1] Detect the oscillation frequency of RX TP123 and TX TP111 using a spectrum analyzer. [2] Check whether switches (Q108, Q112, Q101 and Q105) are turned on and output 3.6V. [3] Check whether the emitter voltage of the four transistors (Q106, Q110, Q100 and Q103) is about 1.8V under normal RX/TX status.
  • Page 445 Service Manual 17. VHF (136-174MHz 25W) Information 17.1 Transmitter Circuit The transmitter circuit is composed of power amplifier circuit and power control circuit. The former is used to amplify the VCO signal to the desired output power level, while the latter can keep the output power at the desired level, so as to protect the power amplifier from damage caused by over heat, antenna mismatch, and out-of-range voltage (over voltage or under voltage may result in damage to Q801, Q805, Q804, Q802 and Q803).
  • Page 446 Service Manual The final power amplifier comprises Q802 and Q803, with the maximum output power of 48.5dBm, and the maximum variable gain of 14dB. The input matching circuit is composed of C815, C839, R804, R806, R807, R813, R818 and R861, while the power combining circuit is composed of C820, C8330, C833, C831, C819, C812, C841 and C842.
  • Page 447 Service Manual The circuit consists of thermistor RT804 and resistor R884. The output voltage is proportional to the detected temperature. Both the voltage used for temperature detection and the threshold voltage are fed into the operational amplifier U803, to output a voltage signal that is in proportion to the detected temperature.
  • Page 448 Service Manual 17.2.2 Receiver Back-end Figure 17-3 Diagram of IF Processor The first IF signal (44.85MHz) output by the IF amplifier goes into IF IC via Pin 47, where the signal is converted to the second IF signal (2.25MHz). Then the un-demodulated digital I/Q signal output from the SSI interface is sent to U302 for demodulation.
  • Page 449 Service Manual (U100) to achieve locking. Figure 17-4 Diagram of PLL IC The 19.2MHz frequency generated by the reference oscillator (X100) goes into the PLL IC (U100) for division, generating the reference frequency. Meanwhile, the frequency generated by VCO goes into PLL IC (U100) for frequency division.
  • Page 450 Service Manual TX_L_VCO Q103 TX PA Q102 Q107 Q100 TX_H_VCO PLL IC （U100） RX_L_VCO Q110 RX Lo Q109 Q111 Q106 RX_H_VCO Figure 17-5 Diagram of VCO...
  • Page 451 17.4 PCB View MD78X/MD78XG PCB View (Front Panel) Top Layer...
  • Page 452 MD78X/MD78XG PCB View (Front Panel) Bottom Layer...
  • Page 453 MD78X/MD78XG PCB View (Main Board) Top Layer...
  • Page 454 PCB View (Main Board) MD78X/MD78XG Bottom Layer...
  • Page 455 17.5 Block Diagram MD78X/MD78XG Block Diagram (Power Section) Auto baterry Voltage Q802\Q803\U201 13.6 Q804\Q805 9V3A 9V1A Q920\Q921\U914 Q801 Q801 Q6102 9V1A Q902 Q6103 U6000 U703 Q6105 U701 U702 U701 U915 4V3A Q104 Q100\Q103\Q106\Q110 U100 U918 3V3A X100 U905 U500 ON\OFF KEY PWB IGN_SENCE U231 EMERGENCY...
  • Page 456 MD78X/MD78XG Block Diagram (RF Section) High Temperature Protection 9V1A_TX Gain:10 dB Gain:11dB Gain:15 dB Tx/Rx Gain:16 dB Switch Gain:-6 dB Tx_PORT Microstrip Attenuator Match Match Match Matcher Microstrip Dual Q804 Harmonic Q805 Q801 Rx_PORT Directional Coupler Driver Filter PreDriver Firststage Switch s Power 9.1V Q802 Q803...
  • Page 457 MD78X/MD78XG Block Diagram (BB Section) IF processor RF Unit BB Schematic Block Diagram TX RX CTL MCSI1 McBSP2 GPIOs TEMP_DET Audio Codec Nor FLASH and pSRAM Headset McBSP1 FLASH: 8Mx16 Driver datax16 pSRAM:2Mx16 TMS320C55x BELL Driver Speed:96MHz(max) Mobile SDRAM McBSP3 128Mb:8Mx16 JTAG JTAG...
  • Page 458 17.6 Schematic Diagram MD78X/MD78XG Schematic Diagram (Audio Circuit) R245 R245 EXT_SPKR+ R253 R253 EXT_SPKR- R293 R293 SPKR1+ R294 R294 SPKR1- L232 L232 9d3V BLM18PG300SN1 BLM18PG300SN1 C232 C232 C233 C233 0.1u 0.1u C285 C285 C284 C284 0.1u 0.1u C234 C234 C235 C235 10uF/25V 10uF/25V...
  • Page 459 MD78X/MD78XG Schematic Diagram (DAC Circuit) L500 L500 R572 R572 BLM18PG600SN1 BLM18PG600SN1 C471 C471 C405 C405 4.7k 4.7k 0.1u 0.1u 10uF/10V 10uF/10V R542 0 R542 0 R573 R573 R570 R570 5.1k 5.1k 5.6k 5.6k C509 C509 C508 C508 C510 C510 R528 R528 10u/10V 10u/10V...
  • Page 460 MD78X/MD78XG Schematic Diagram (Memory Circuit) F_D0 R487 R487 F_D0_LCD F_D1 R489 R489 F_D1_LCD F_D2 R490 R490 F_D2_LCD F_D3 R492 R492 F_D3_LCD F_D4 R515 R515 F_D4_LCD F_D5 R516 R516 F_D5_LCD F_D6 R517 R517 F_D6_LCD F_D7 R518 R518 F_D7_LCD R519 R519 /OE_LCD R520 R520 /WE_LCD...
  • Page 461 MD78X/MD78XG Schematic Diagram (OMAP Circuit) 19.2_OMAP 3V3A R414 R414 R419 R419 C338 C338 C336 C336 C401 C401 0.1u 0.1u 10u/10V 10u/10V 1000p 1000p TP309 TP309 C364 39p C364 39p X302 X302 TP377 TP377 L151 L151 C337 C337 R426 R426 C375 C375 C376 C376...
  • Page 462 MD78X/MD78XG Schematic Diagram (OMAP & GPS Circuit) 3V3D TP326 TP326 R323 R323 R325 R325 U302B U302B OMAP OMAP 3V3D MPUIO2/SPIF.CS1/UWIRE.CS1 LCD.P0 U322 U322 R357 R357 98_PE MPUIO4/SPIF.CS2/UWIRE.CS2/LED2 LCD.P1 R329 R329 R330 R330 R327 R327 DVDD_IO SLC/SPC I2C_SCL 98_PC MPUIO1/SPIF.SCK LCD.P2 R324 R324 R334 10K...
  • Page 463 MD78X/MD78XG Schematic Diagram ( Peripheral Interface Circuit) 3V3D C482 C482 C481 C481 C409 C409 C410 C410 C411 C411 C412 C412 C413 C413 C414 C414 C415 C415 C416 C416 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p J400 J400 100p...
  • Page 464 MD78X/MD78XG Schematic Diagram 40-Pin Interface Circuit) SPK+ SPK+ 3V3D C468 C468 C439 C439 C438 C438 C441 C441 C440 C440 C435 C435 C420 C420 C419 C419 USB_VBUS R494 R494 R555 R555 100p 100p 0.47u 0.47u 0.47u 0.47u 100p 100p 100p 100p 100p 100p 100p...
  • Page 465 MD78X/MD78XG Schematic Diagram (Power Circuit) TP4031 TP4031 TP4032 TP4032 U900 U900 B900 B900 RP102N331B RP102N331B R901 R901 3V3D VOUT C900 C900 C901 C901 C902 C902 D900 D900 C903 C903 470p/50V 470p/50V MMBZ6V8ALT1G MMBZ6V8ALT1G 470uF/25V 470uF/25V MR2835SKG MR2835SKG D237 D237 B901 B901 U901 U901...
  • Page 466 MD78X/MD78XG Schematic Diagram ( Circuit) C983 C983 C985 C985 C973 C973 C972 C972 C974 C974 C971 C971 C984 C984 R878 R878 C986 C986 C970 C970 C975 C975 C976 C976 C977 C977 C982 C982 L812 L812 220p 220p 180p 180p 120p 120p 150p 150p...
  • Page 467 MD78X/MD78XG Schematic Diagram (PLL Circuit) 5VA_FGU L156 L156 3.3UH 3.3UH R175 R175 0.1u 0.1u C1010 C1010 C1009 C1009 1500p 1500p 1500p 1500p 1u/16V 1u/16V 3V3A_FGU 601SN1 601SN1 601SN1 601SN1 0.01U 0.01U 0.1u 0.1u 601SN1 601SN1 C121 C121 100p 100p 0.1u 0.1u PLLLD PLLLD...
  • Page 468 MD78X/MD78XG Schematic Diagram (VCO Circuit) R153 R153 601SN1 601SN1 R185 R185 5VA_FGU Q117 Q117 EMD22 EMD22 R142 R142 Q101 Q101 D127 D127 3.3k 3.3k 1500p 1500p 0.1u 0.1u DAN222 DAN222 EMD22 EMD22 4V3A 680n 680n TX_VCO_H R145 R145 1500p 1500p C195 C195 C194...
  • Page 469 MD78X/MD78XG Schematic Diagram (RX Circuit) L6200 L6200 BLM18PG600SN1 BLM18PG600SN1 9V1A_RX C6243 C6243 0.1uF 0.1uF R6201 R6201 C6202 C6202 C6100 C6100 R6100 R6100 470p 470p TRANSISTOR TRANSISTOR Q6201 Q6201 L6101 L6101 R6202 R6202 BLM18PG600SN1 BLM18PG600SN1 UMT1N UMT1N RF_ATTEN C6103 C6103 220p 220p TP6202 TP6202...
  • Page 470 MD78X/MD78XG Schematic Diagram (IF Circuit) TP703 TP703 TP702 TP702 TP704 TP704 C701 C701 C703 C703 2FLO 2FLO 0.01u 0.01u IF-out TP701 TP701 L716 L716 C743 C743 TEST POINT TEST POINT C702 C702 0.01u 0.01u L701 L701 L702 L702 601S 601S L703 L703 C742...
  • Page 471 MD78X/MD78XG Schematic Diagram (Front Panel) 3V3A TP10 TP10 TP11 TP11 TP12 TP12 TP13 TP13 TP14 TP14 TP15 TP15 TP16 TP16 TP17 TP17 MMBZ6V8ALT1G MMBZ6V8ALT1G 100pf 100pf MENU 100pf 100pf 0.1uf 0.1uf DOWN EMI FILTER EMI FILTER UART2_RXD LOGIC IC LOGIC IC PRST BACK UART2_TXD...
  • Page 472 Service Manual 17.7 Parts List Main Board for MD78X/MD78XG Ref. No. Part No. Description 3101051520000 1500PF C100 3101051520000 1500PF C1001 3101051520000 1500PF C1010 3101051520000 1500PF 3101051520000 1500PF 3101051520000 1500PF C142 3101051520000 1500PF C147 3101051520000 1500PF C148 3101051520000 1500PF C150 3101051520000 1500PF C156 3101051520000...
  • Page 473 Service Manual Ref. No. Part No. Description 3101052400010 24PF C6083 3101052400010 24PF C6085 3101052400010 24PF C6245 3101052000040 20PF C6246 3101052000040 20PF C747 3101052200010 22PF C918 3101052200010 22PF C1006 3101051040010 0.1UF C141 3101051040010 0.1UF C149 3101051040010 0.1UF C163 3101051040010 0.1UF C167 3101051040010 0.1UF C195...
  • Page 474 Service Manual Ref. No. Part No. Description C392 3101051040010 0.1UF C393 3101051040010 0.1UF C394 3101051040010 0.1UF C398 3101051040010 0.1UF C400 3101051040010 0.1UF C407 3101051040010 0.1UF C422 3101051040010 0.1UF C471 3101051040010 0.1UF C473 3101051040010 0.1UF C509 3101051040010 0.1UF C512 3101051040010 0.1UF C514 3101051040010 0.1UF...
  • Page 475 Service Manual Ref. No. Part No. Description 3101051040010 0.1UF 3101051040010 0.1UF C947 3101051040010 0.1UF C950 3101051040010 0.1UF C955 3101051040010 0.1UF C958 3101051040010 0.1UF C967 3101051040010 0.1UF C968 3101051040010 0.1UF C969 3101051040010 0.1UF C978 3101051040010 0.1UF 3101051040010 0.1UF C166 3101051500080 15PF C168 3101051500080 15PF...
  • Page 476 Service Manual Ref. No. Part No. Description 3101051800070 18PF C6170 3101051800070 18PF 3101052000020 20PF 3101052000020 20PF C6161 3101052000020 20PF C6164 3101052000020 20PF C1002 3101051020010 1000PF C337 3101051020010 1000PF C338 3101051020010 1000PF 3101051020010 1000PF C513 3101051020010 1000PF C6205 3101051020010 1000PF C6207 3101051020010 1000PF C6208...
  • Page 477 Service Manual Ref. No. Part No. Description C306 3101051030020 0.01UF C381 3101051030020 0.01UF C384 3101051030020 0.01UF C399 3101051030020 0.01UF C506 3101051030020 0.01UF C507 3101051030020 0.01UF 3101051030020 0.01UF C6155 3101051030020 0.01UF C6178 3101051030020 0.01UF C701 3101051030020 0.01UF C702 3101051030020 0.01UF C725 3101051030020 0.01UF C736...
  • Page 478 Service Manual Ref. No. Part No. Description C339 3101051010030 100PF C341 3101051010030 100PF C342 3101051010030 100PF C343 3101051010030 100PF C344 3101051010030 100PF C345 3101051010030 100PF C346 3101051010030 100PF C347 3101051010030 100PF C348 3101051010030 100PF C349 3101051010030 100PF C350 3101051010030 100PF C351 3101051010030 100PF...
  • Page 479 Service Manual Ref. No. Part No. Description C441 3101051010030 100PF C442 3101051010030 100PF C443 3101051010030 100PF C444 3101051010030 100PF C445 3101051010030 100PF C446 3101051010030 100PF C447 3101051010030 100PF C448 3101051010030 100PF C449 3101051010030 100PF C450 3101051010030 100PF C451 3101051010030 100PF C452 3101051010030 100PF...
  • Page 480 Service Manual Ref. No. Part No. Description C6166 3101052710000 270PF 3101052710000 270PF C101 3101053690010 3.6PF C102 3101060500010 C123 3101061040010 0.1UF C283 3101061040010 0.1UF C289 3101061040010 0.1UF C6193 3101061040010 0.1UF C748 3101061040010 0.1UF C829 3101061040010 0.1UF C854 3101061040010 0.1UF C868 3101061040010 0.1UF C907 3101061040010...
  • Page 481 Service Manual Ref. No. Part No. Description C424 3101052210010 220PF C425 3101052210010 220PF C432 3101052210010 220PF C433 3101052210010 220PF C434 3101052210010 220PF C436 3101052210010 220PF C437 3101052210010 220PF C6103 3101052210010 220PF C6106 3101052210010 220PF C6144 3101052210010 220PF C6159 3101052210010 220PF C704 3101052210010 220PF...
  • Page 482 Service Manual Ref. No. Part No. Description C251 3101061050020 C252 3101061050020 C253 3101061050020 C257 3101061050020 C259 3101061050020 C262 3101061050020 C263 3101061050020 C264 3101061050020 C266 3101061050020 C268 3101061050020 C277 3101061050020 C278 3101061050020 C279 3101061050020 C281 3101061050020 C282 3101061050020 C290 3101061050020 C291 3101061050020 C298 3101061050020...
  • Page 483 Service Manual Ref. No. Part No. Description C981 3101081060010 10UF C237 3101054740020 0.47uF C438 3101054740000 0.47UF C439 3101054740000 0.47UF C241 3001060000000 0Ω C6158 3001060000000 0Ω C6176 3001060000000 0Ω C813 3001060000000 0Ω C814 3001060000000 0Ω L716 3001060000000 0Ω L718 3001060000000 0Ω R171 3001060000000 0Ω...
  • Page 484 Service Manual Ref. No. Part No. Description C985 3101062210000 220PF C246 3101052230000 0.022UF C255 3101051050000 C276 3101051050000 C305 3101051050000 C310 3101051050000 C719 3101051050000 C962 3101051050000 C287 3101064740000 0.47UF C1013 3104071060070 10UF C293 3104071060070 10UF C367 3104071060070 10UF C401 3104071060070 10UF C402 3104071060070 10UF...
  • Page 485 Service Manual Ref. No. Part No. Description C727 3101054710010 470PF C746 3101054710010 470PF C945 3101054710010 470PF C713 3101053330000 0.033UF C294 3101063340000 0.33UF C715 3101063340000 0.33UF C716 3101061810010 180PF C940 3101061810010 180PF C977 3101061810010 180PF C198 3101050800000 C6183 3101050800000 C6210 3101050800000 C731 3101050800000 C6066...
  • Page 486 Service Manual Ref. No. Part No. Description C984 3101065610000 560PF C804 3101092260010 22UF C933 3101092260010 22UF C812 3101371010000 100pF C820 3101371010000 100pF C870 3101371010000 100pF C8330 3101376800000 68pF C842 3101376800000 68pF C861 3101068210000 820PF 3101061520010 1500PF C822 3101061520010 1500PF C853 3101061520010 1500PF C990...
  • Page 487 Service Manual Ref. No. Part No. Description C992 3101061010010 100PF C970 3101063910000 390PF C862 3101060200010 C886 3101064720000 4700PF C949 3101062720000 2700PF C819 3101082700010 27pF C841 3101082700010 27pF C856 3101082700010 27pF C891 3101051210000 120PF C899 3101051210000 120PF C802 3101064700000 47PF C986 3101064700000 47PF L833...
  • Page 488 Service Manual Ref. No. Part No. Description R375 3001050000000 0Ω R399 3001050000000 0Ω R426 3001050000000 0Ω R440 3001050000000 0Ω 3001050000000 0Ω R505 3001050000000 0Ω R507 3001050000000 0Ω R508 3001050000000 0Ω R536 3001050000000 0Ω R544 3001050000000 0Ω R564 3001050000000 0Ω R565 3001050000000 0Ω...
  • Page 489 Service Manual Ref. No. Part No. Description D106 3304010100220 Varactor D107 3304010100220 Varactor D108 3304010100220 Varactor D109 3304010100220 Varactor D110 3304010100220 Varactor D111 3304010100220 Varactor D112 3304010100220 Varactor D113 3304010100220 Varactor D116 3304010100220 Varactor D117 3304010100220 Varactor D121 3304010100220 Varactor D122 3304010100220 Varactor...
  • Page 490 Service Manual Ref. No. Part No. Description D917 3302030500030 Zener diode D901 3303040400000 Switching diode D902 3301100300030 Rectifier diode D904 3301240000000 Diode D905 3301240000000 Diode D6100 3303060300010 Switching diode D906 3303060300010 Switching diode D907 3303060300010 Switching diode D909 3303060300010 Switching diode D911 3303060300010 Switching diode...
  • Page 491 Service Manual Ref. No. Part No. Description L709 3221506601000 600Ω L710 3221506601000 600Ω L711 3221506601000 600Ω L712 3221506601000 600Ω L714 3221506601000 600Ω 3221506601000 600Ω L815 3221506601000 600Ω L821 3221506601000 600Ω L824 3221506601000 600Ω L825 3221506601000 600Ω 3221506601000 600Ω R153 3221506601000 600Ω...
  • Page 492 Service Manual Ref. No. Part No. Description L407 3221506300000 30Ω L408 3221506300000 30Ω L409 3221506300000 30Ω L410 3221506300000 30Ω L411 3221506300000 30Ω L412 3221506300000 30Ω L901 3221506300000 30Ω L912 3221506300000 30Ω L913 3221506300000 30Ω L233 3211506101000 100nH L234 3211506101000 100nH L235 3211506101000 100nH...
  • Page 493 Service Manual Ref. No. Part No. Description L832 3212106180000 18nH L830 3233099185900 18.5nH L902 3217299103000 10uH L903 3213099472000 4.7uH L931 3213099472000 4.7uH L904 3221506181000 180Ω L908 3221506181000 180Ω L930 3241799103000 10uH L6015 3221505121010 Bead L6036 3221505121010 Bead L6026 3210106680000 68nH L6027 3210106680000 68nH...
  • Page 494 Service Manual Ref. No. Part No. Description Q101 3403999000000 Transistor Q105 3403999000000 Transistor Q108 3403999000000 Transistor Q112 3403999000000 Transistor Q116 3403999000000 Transistor Q117 3403999000000 Transistor Q102 3401002000990 NPN transistor Q111 3401002000990 NPN transistor Q104 3403003000060 NPN transistor Q702 3403003000060 NPN transistor Q107 3404006000000 NPN transistor...
  • Page 495 Service Manual Ref. No. Part No. Description 1010 3001061010000 100Ω 1011 R823 3001062200000 22Ω 1012 R162 3001058200000 82Ω 1013 R109 3001051000000 10Ω 1014 R175 3001051000000 10Ω 1015 R386 3001051000000 10Ω 1016 R388 3001051000000 10Ω 1017 R414 3001051000000 10Ω 1018 R114 3001066800000 68Ω...
  • Page 496 Service Manual Ref. No. Part No. Description 1054 R251 3001051010040 100Ω 1055 R260 3001051010040 100Ω 1056 R271 3001051010040 100Ω 1057 R278 3001051010040 100Ω 1058 R337 3001051010040 100Ω 1059 R338 3001051010040 100Ω 1060 R339 3001051010040 100Ω 1061 R346 3001051010040 100Ω 1062 R403 3001051010040 100Ω...
  • Page 497 Service Manual Ref. No. Part No. Description 1098 R1110 3001053300010 33Ω 1099 R156 3001053300010 33Ω 1100 R167 3001053300010 33Ω 1101 R178 3001053300010 33Ω 1102 R231 3001053300010 33Ω 1103 R232 3001053300010 33Ω 1104 R292 3001053300010 33Ω 1105 R319 3001053300010 33Ω 1106 R320 3001053300010 33Ω...
  • Page 498 Service Manual Ref. No. Part No. Description 1142 R433 3001053300010 33Ω 1143 R456 3001053300010 33Ω 1144 R457 3001053300010 33Ω 1145 R467 3001053300010 33Ω 1146 R473 3001053300010 33Ω 1147 R474 3001053300010 33Ω 1148 R479 3001053300010 33Ω 1149 R485 3001053300010 33Ω 1150 R486 3001053300010 33Ω...
  • Page 499 Service Manual Ref. No. Part No. Description 1186 R428 3001054720000 4.7K 1187 R435 3001054720000 4.7K 1188 R436 3001054720000 4.7K 1189 R437 3001054720000 4.7K 1190 R448 3001054720000 4.7K 1191 R468 3001054720000 4.7K 1192 R469 3001054720000 4.7K 1193 R470 3001054720000 4.7K 1194 R471 3001054720000 4.7K...
  • Page 500 Service Manual Ref. No. Part No. Description 1230 R341 3001051030000 10KΩ 1231 R342 3001051030000 10KΩ 1232 R343 3001051030000 10KΩ 1233 R351 3001051030000 10KΩ 1234 R353 3001051030000 10KΩ 1235 R372 3001051030000 10KΩ 1236 R377 3001051030000 10KΩ 1237 R378 3001051030000 10KΩ 1238 R379 3001051030000 10KΩ...
  • Page 501 Service Manual Ref. No. Part No. Description 1274 R532 3001051030000 10KΩ 1275 R534 3001051030000 10KΩ 1276 R535 3001051030000 10KΩ 1277 R538 3001051030000 10KΩ 1278 R539 3001051030000 10KΩ 1279 R540 3001051030000 10KΩ 1280 R541 3001051030000 10KΩ 1281 R543 3001051030000 10KΩ 1282 R555 3001051030000 10KΩ...
  • Page 502 Service Manual Ref. No. Part No. Description 1318 R947 3001051020000 1KΩ 1319 R957 3001051020000 1KΩ 1320 R978 3001051020000 1KΩ 1321 R111 3001068200000 82Ω 1322 R835 3001063300000 33Ω 1323 R239 3001055620000 5.6K 1324 R287 3001055620000 5.6K 1325 R573 3001055620000 5.6K 1326 R6205 3001055620000 5.6K...
  • Page 503 Service Manual Ref. No. Part No. Description 1362 R279 3001053030000 30KΩ 1363 R283 3001053030000 30KΩ 1364 R6134 3001053030000 30KΩ 1365 R6137 3001053030000 30KΩ 1366 R265 3001051820000 1.8K 1367 R714 3001051820000 1.8K 1368 R839 3001051820000 1.8K 1369 R152 3001054730000 47KΩ 1370 R266 3001054730000 47KΩ...
  • Page 504 Service Manual Ref. No. Part No. Description 1406 R548 3001054710000 470Ω 1407 R549 3001054710000 470Ω 1408 R550 3001054710000 470Ω 1409 R551 3001054710000 470Ω 1410 R6208 3001054710000 470Ω 1411 R568 3001055120030 5.1K 1412 R570 3001055120030 5.1K 1413 R577 3001055120030 5.1K 1414 R6130 3001055120030 5.1K...
  • Page 505 Service Manual Ref. No. Part No. Description 1450 R895 3001055630000 56KΩ 1451 R858 3001069120000 9.1K 1452 R859 3001061020010 1KΩ 1453 R924 3001061020010 1KΩ 1454 R939 3001061020010 1KΩ 1455 R954 3001061020010 1KΩ 1456 R970 3001061020010 1KΩ 1457 R974 3001061020010 1KΩ 1458 R872 3001051840000 180K...
  • Page 506 Service Manual Ref. No. Part No. Description 1494 R6204 3001052730010 27KΩ 1495 R6109 3001063910000 390Ω 1496 R6113 3001052740000 270K 1497 L811 3001063310010 330Ω 1498 R6129 3001063310010 330Ω 1499 R811 3001063310010 330Ω 1500 T6100 3244599189000 4BLH 1501 T6101 3244599189000 4BLH 1502 U100 3604019000000 PLL IC...
  • Page 507 Service Manual Ref. No. Part No. Description 1538 R934 3001055130010 51KΩ 1539 C718 3101051050160 1540 L106 3214307181000 180nH 1541 C859 3101068200000 82PF 1542 C888 3101068200000 82PF 1543 L6213 3210305560000 56nH 1544 L6216 3210305560000 56nH 1545 L414 3221505121000 120Ω 1546 L415 3221505121000 120Ω...
  • Page 508 Service Manual Ref. No. Part No. Description 1582 L110 3217107102000 1583 L121 3217107102000 1584 L134 3217107102000 1585 L819 3233099470000 47nH 1586 L820 3233099470000 47nH 1587 D900 3302060000000 Zener diode 1588 Q921 3404999000020 NPN transistor 1589 U328 3607082000040 Serial-to-parallel converter 1590 U232 3612044000010 Memory...
  • Page 509 Service Manual 17.8 Troubleshooting Flow Chart Receiver Circuit...
  • Page 510 Service Manual Description of Normal Situations: [1] During sensitivity test, use a communication test set to demodulate the audio signal (TP4012 and TP4016). If the signal is demodulated normally, it is concluded that the front panel is defective. [2] Use the communication test set to input a 44.85MHz IF signal at the mixer, and see whether it can be processed normally afterwards.
  • Page 511 Service Manual Transmitter Circuit...
  • Page 512 Service Manual Description of Normal Situations: [1] The current in analog mode is above 6A under 45W power supply and above 1A under 5W. However, in digital mode, the current will be reduced by 50%. [2] The APC voltage should be above 2V at TP811. [3] Check whether there is an appropriate TX LO signal at TP803.
  • Page 513 Service Manual...
  • Page 514 Service Manual Description of Normal Situations: [1] Detect the oscillation frequency of RX TP123 and TX TP111 using a spectrum analyzer or the communication test set. [2] Check whether switches (Q108, Q112, Q101 and Q105) are turned on and output 4.3V. [3] Check whether the emitter-base voltage of the four transistors (Q106, Q110, Q100 and Q103) is about 0.7V under normal RX/TX status.
  • Page 515 Service Manual 18. VHF (136-174MHz 50W) Information 18.1 Transmitter Circuit The transmitter circuit is composed of power amplifier circuit and power control circuit. The former is used to amplify the VCO signal to the desired output power level, while the latter can keep the output power at the desired level, so as to protect the power amplifier from damage caused by over heat, antenna mismatch, and out-of-range voltage (over voltage or under voltage may result in damage to Q801, Q805, Q804, Q802 and Q803).
  • Page 516 Service Manual the maximum variable gain of 14dB. The input matching circuit is composed of C815, C839, R804, R806, R807, R813, R818 and R861, while the power combining circuit is composed of C820, C8330, C833, C831, C819, C812, C841 and C842. 18.1.5 Antenna Switch The antenna switch is used to switch between the transmitter circuit and the receiver circuit.
  • Page 517 Service Manual detected temperature. Both the voltage used for temperature detection and the threshold voltage are fed into the operational amplifier U803, to output a voltage signal that is in proportion to the detected temperature. Afterwards, the voltage is applied to software for judgment, and then the preset voltage will be subsequently changed to reduce the TX power, and to protect the PA from over-heating.
  • Page 518 Service Manual Figure 18-3 Diagram of IF Processor The first IF signal (44.85MHz) output by the IF amplifier goes into IF IC via Pin 47, where the signal is converted to the second IF signal (2.25MHz). Then the un-demodulated digital I/Q signal output from the SSI interface is sent to U302 for demodulation.
  • Page 519 Service Manual Figure 18-4 Diagram of PLL IC The 19.2MHz frequency generated by the reference oscillator (X100) goes into the PLL IC (U100) for division, generating the reference frequency. Meanwhile, the frequency generated by VCO goes into PLL IC (U100) for frequency division. The resulting frequency will be compared with the reference frequency in terms of phase difference in the phase detector.
  • Page 520 Service Manual TX_L_VCO Q103 TX PA Q102 Q107 Q100 TX_H_VCO PLL IC （U100） RX_L_VCO Q110 RX Lo Q109 Q111 Q106 RX_H_VCO Figure 18-5 Diagram of VCO...
  • Page 521 18.4 PCB View MD78X/MD78XG PCB View (Front Panel) Top Layer...
  • Page 522 MD78X/MD78XG PCB View (Front Panel) Bottom Layer...
  • Page 523 MD78X/MD78XG PCB View (Main Board) Top Layer...
  • Page 524 PCB View (Main Board) MD78X/MD78XG Bottom Layer...
  • Page 525 18.5 Block Diagram MD78X/MD78XG Block Diagram (Power Section) Auto baterry Voltage Q802\Q803\U201 13.6 Q804\Q805 9V3A 9V1A Q920\Q921\U914 Q801 Q801 Q6102 9V1A Q902 Q6103 U6000 U703 Q6105 U701 U702 U701 U915 4V3A Q100\Q103\Q106\Q110 Q104 U100 U918 3V3A X100 U905 U500 ON\OFF KEY PWB IGN_SENCE EMERGENCY U231...
  • Page 526 MD78X/MD78XG Block Diagram (RF Section) High Temperature Protection 9V1A_TX Gain:10 dB Gain:15 dB Gain:11dB Tx/Rx Gain:16 dB Gain:-6 dB Switch Tx_PORT Microstrip Attenuator Match Match Match Matcher Microstrip Dual Q804 Harmonic Q805 Q801 Rx_PORT Directional Coupler Driver Filter PreDriver Firststage Switch s Power 9.1V Q802 Q803...
  • Page 527 MD78X/MD78XG Block Diagram (BB Section) IF processor RF Unit BB Schematic Block Diagram TX RX CTL MCSI1 McBSP2 GPIOs TEMP_DET Audio Codec Nor FLASH and pSRAM Headset McBSP1 FLASH: 8Mx16 Driver datax16 pSRAM:2Mx16 TMS320C55x BELL Driver Speed:96MHz(max) Mobile SDRAM McBSP3 128Mb:8Mx16 JTAG JTAG...
  • Page 528 18.6 Schematic Diagram MD78X/MD78XG Schematic Diagram (Audio Circuit) R245 R245 EXT_SPKR+ R253 R253 EXT_SPKR- R293 R293 SPKR1+ R294 R294 SPKR1- L232 L232 9d3V BLM18PG300SN1 BLM18PG300SN1 C232 C232 C233 C233 0.1u 0.1u C285 C285 C284 C284 0.1u 0.1u C234 C234 C235 C235 10uF/25V 10uF/25V...
  • Page 529 MD78X/MD78XG Schematic Diagram (DAC Circuit) L500 L500 R572 R572 BLM18PG600SN1 BLM18PG600SN1 C471 C471 C405 C405 4.7k 4.7k 0.1u 0.1u 10uF/10V 10uF/10V R542 0 R542 0 R573 R573 R570 R570 5.1k 5.1k 5.6k 5.6k C509 C509 C508 C508 C510 C510 R528 R528 10u/10V 10u/10V...
  • Page 530 MD78X/MD78XG Schematic Diagram (Memory Circuit) F_D0 R487 R487 F_D0_LCD F_D1 R489 R489 F_D1_LCD F_D2 R490 R490 F_D2_LCD F_D3 R492 R492 F_D3_LCD F_D4 R515 R515 F_D4_LCD F_D5 R516 R516 F_D5_LCD F_D6 R517 R517 F_D6_LCD F_D7 R518 R518 F_D7_LCD R519 R519 /OE_LCD R520 R520 /WE_LCD...
  • Page 531 MD78X/MD78XG Schematic Diagram (OMAP Circuit) 19.2_OMAP 3V3A R414 R414 R419 R419 C338 C338 C336 C336 C401 C401 0.1u 0.1u 10u/10V 10u/10V 1000p 1000p TP309 TP309 C364 39p C364 39p X302 X302 TP377 TP377 L151 L151 C337 C337 R426 R426 C375 C375 C376 C376...
  • Page 532 MD78X/MD78XG Schematic Diagram (OMAP & GPS Circuit) 3V3D TP326 TP326 R323 R323 R325 R325 U302B U302B OMAP OMAP 3V3D MPUIO2/SPIF.CS1/UWIRE.CS1 LCD.P0 U322 U322 R357 R357 98_PE MPUIO4/SPIF.CS2/UWIRE.CS2/LED2 LCD.P1 R329 R329 R330 R330 R327 R327 DVDD_IO SLC/SPC I2C_SCL 98_PC MPUIO1/SPIF.SCK LCD.P2 R324 R324 R334 10K...
  • Page 533 Peripheral Interface MD78X/MD78XG Schematic Diagram ( Circuit) 3V3D C482 C482 C481 C481 C409 C409 C410 C410 C411 C411 C412 C412 C413 C413 C414 C414 C415 C415 C416 C416 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p 100p J400 J400 100p...
  • Page 534 MD78X/MD78XG Schematic Diagram 40-Pin Interface Circuit) SPK+ SPK+ 3V3D C468 C468 C439 C439 C438 C438 C441 C441 C440 C440 C435 C435 C420 C420 C419 C419 USB_VBUS R494 R494 R555 R555 100p 100p 0.47u 0.47u 0.47u 0.47u 100p 100p 100p 100p 100p 100p 100p...
  • Page 535 MD78X/MD78XG Schematic Diagram (Power Circuit) TP4031 TP4031 TP4032 TP4032 U900 U900 B900 B900 RP102N331B RP102N331B R901 R901 3V3D VOUT C900 C900 C901 C901 C902 C902 D900 D900 C903 C903 470p/50V 470p/50V MMBZ6V8ALT1G MMBZ6V8ALT1G 470uF/25V 470uF/25V MR2835SKG MR2835SKG D237 D237 B901 B901 U901 U901...
  • Page 536 MD78X/MD78XG Schematic Diagram ( Circuit) C983 C983 C985 C985 C973 C973 C972 C972 C974 C974 C971 C971 C984 C984 R878 R878 C986 C986 C970 C970 C975 C975 C976 C976 C977 C977 C982 C982 L812 L812 220p 220p 180p 180p 120p 120p 150p 150p...
  • Page 537 MD78X/MD78XG Schematic Diagram (PLL Circuit) 5VA_FGU L156 L156 3.3UH 3.3UH R175 R175 0.1u 0.1u C1010 C1010 C1009 C1009 1500p 1500p 1500p 1500p 1u/16V 1u/16V 3V3A_FGU 601SN1 601SN1 601SN1 601SN1 0.01U 0.01U 0.1u 0.1u 601SN1 601SN1 C121 C121 100p 100p 0.1u 0.1u PLLLD PLLLD...
  • Page 538 MD78X/MD78XG Schematic Diagram (VCO Circuit) R153 R153 601SN1 601SN1 R185 R185 5VA_FGU Q117 Q117 EMD22 EMD22 R142 R142 Q101 Q101 D127 D127 3.3k 3.3k 1500p 1500p 0.1u 0.1u DAN222 DAN222 EMD22 EMD22 4V3A 680n 680n TX_VCO_H R145 R145 1500p 1500p C195 C195 C194...
  • Page 539 MD78X/MD78XG Schematic Diagram (RX Circuit) L6200 L6200 BLM18PG600SN1 BLM18PG600SN1 9V1A_RX C6243 C6243 0.1uF 0.1uF R6201 R6201 C6202 C6202 C6100 C6100 R6100 R6100 470p 470p TRANSISTOR TRANSISTOR Q6201 Q6201 L6101 L6101 R6202 R6202 BLM18PG600SN1 BLM18PG600SN1 UMT1N UMT1N RF_ATTEN C6103 C6103 220p 220p TP6202 TP6202...
  • Page 540 MD78X/MD78XG Schematic Diagram (IF Circuit) TP703 TP703 TP702 TP702 TP704 TP704 C701 C701 C703 C703 2FLO 2FLO 0.01u 0.01u IF-out TP701 TP701 L716 L716 C743 C743 TEST POINT TEST POINT C702 C702 0.01u 0.01u L701 L701 L702 L702 601S 601S L703 L703 C742...
  • Page 541 MD78X/MD78XG Schematic Diagram (Front Panel) 3V3A TP10 TP10 TP11 TP11 TP12 TP12 TP13 TP13 TP14 TP14 TP15 TP15 TP16 TP16 TP17 TP17 MMBZ6V8ALT1G MMBZ6V8ALT1G 100pf 100pf MENU 100pf 100pf 0.1uf 0.1uf DOWN EMI FILTER EMI FILTER UART2_RXD LOGIC IC LOGIC IC PRST BACK UART2_TXD...
  • Page 542 Service Manual 18.7 Parts List Main Board for MD78X/MD78XG Ref. No. Part No. Description 3101051520000 1500PF C100 3101051520000 1500PF C1001 3101051520000 1500PF C1010 3101051520000 1500PF 3101051520000 1500PF 3101051520000 1500PF C142 3101051520000 1500PF C147 3101051520000 1500PF C148 3101051520000 1500PF C150 3101051520000 1500PF C156 3101051520000...
  • Page 543 Service Manual Ref. No. Part No. Description 3101052400010 24PF C6083 3101052400010 24PF C6085 3101052400010 24PF C6245 3101052000040 20PF C6246 3101052000040 20PF C747 3101052200010 22PF C918 3101052200010 22PF C1006 3101051040010 0.1UF C141 3101051040010 0.1UF C149 3101051040010 0.1UF C163 3101051040010 0.1UF C167 3101051040010 0.1UF C195...
  • Page 544 Service Manual Ref. No. Part No. Description C392 3101051040010 0.1UF C393 3101051040010 0.1UF C394 3101051040010 0.1UF C398 3101051040010 0.1UF C400 3101051040010 0.1UF C407 3101051040010 0.1UF C422 3101051040010 0.1UF C471 3101051040010 0.1UF C473 3101051040010 0.1UF C509 3101051040010 0.1UF C512 3101051040010 0.1UF C514 3101051040010 0.1UF...
  • Page 545 Service Manual Ref. No. Part No. Description 3101051040010 0.1UF 3101051040010 0.1UF C947 3101051040010 0.1UF C950 3101051040010 0.1UF C955 3101051040010 0.1UF C958 3101051040010 0.1UF C967 3101051040010 0.1UF C968 3101051040010 0.1UF C969 3101051040010 0.1UF C978 3101051040010 0.1UF 3101051040010 0.1UF C166 3101051500080 15PF C168 3101051500080 15PF...
  • Page 546 Service Manual Ref. No. Part No. Description 3101051800070 18PF C6170 3101051800070 18PF 3101052000020 20PF 3101052000020 20PF C6161 3101052000020 20PF C6164 3101052000020 20PF C1002 3101051020010 1000PF C337 3101051020010 1000PF C338 3101051020010 1000PF 3101051020010 1000PF C513 3101051020010 1000PF C6205 3101051020010 1000PF C6207 3101051020010 1000PF C6208...
  • Page 547 Service Manual Ref. No. Part No. Description C306 3101051030020 0.01UF C381 3101051030020 0.01UF C384 3101051030020 0.01UF C399 3101051030020 0.01UF C506 3101051030020 0.01UF C507 3101051030020 0.01UF 3101051030020 0.01UF C6155 3101051030020 0.01UF C6178 3101051030020 0.01UF C701 3101051030020 0.01UF C702 3101051030020 0.01UF C725 3101051030020 0.01UF C736...
  • Page 548 Service Manual Ref. No. Part No. Description C339 3101051010030 100PF C341 3101051010030 100PF C342 3101051010030 100PF C343 3101051010030 100PF C344 3101051010030 100PF C345 3101051010030 100PF C346 3101051010030 100PF C347 3101051010030 100PF C348 3101051010030 100PF C349 3101051010030 100PF C350 3101051010030 100PF C351 3101051010030 100PF...
  • Page 549 Service Manual Ref. No. Part No. Description C441 3101051010030 100PF C442 3101051010030 100PF C443 3101051010030 100PF C444 3101051010030 100PF C445 3101051010030 100PF C446 3101051010030 100PF C447 3101051010030 100PF C448 3101051010030 100PF C449 3101051010030 100PF C450 3101051010030 100PF C451 3101051010030 100PF C452 3101051010030 100PF...
  • Page 550 Service Manual Ref. No. Part No. Description C6166 3101052710000 270PF 3101052710000 270PF C101 3101053690010 3.6PF C102 3101060500010 C123 3101061040010 0.1UF C283 3101061040010 0.1UF C289 3101061040010 0.1UF C6193 3101061040010 0.1UF C748 3101061040010 0.1UF C829 3101061040010 0.1UF C854 3101061040010 0.1UF C868 3101061040010 0.1UF C907 3101061040010...
  • Page 551 Service Manual Ref. No. Part No. Description C424 3101052210010 220PF C425 3101052210010 220PF C432 3101052210010 220PF C433 3101052210010 220PF C434 3101052210010 220PF C436 3101052210010 220PF C437 3101052210010 220PF C6103 3101052210010 220PF C6106 3101052210010 220PF C6144 3101052210010 220PF C6159 3101052210010 220PF C704 3101052210010 220PF...
  • Page 552 Service Manual Ref. No. Part No. Description C251 3101061050020 C252 3101061050020 C253 3101061050020 C257 3101061050020 C259 3101061050020 C262 3101061050020 C263 3101061050020 C264 3101061050020 C266 3101061050020 C268 3101061050020 C277 3101061050020 C278 3101061050020 C279 3101061050020 C281 3101061050020 C282 3101061050020 C290 3101061050020 C291 3101061050020 C298 3101061050020...
  • Page 553 Service Manual Ref. No. Part No. Description C981 3101081060010 10UF C237 3101054740020 0.47uF C438 3101054740000 0.47UF C439 3101054740000 0.47UF C241 3001060000000 0Ω C6158 3001060000000 0Ω C6176 3001060000000 0Ω C813 3001060000000 0Ω C814 3001060000000 0Ω L716 3001060000000 0Ω L718 3001060000000 0Ω R171 3001060000000 0Ω...
  • Page 554 Service Manual Ref. No. Part No. Description C985 3101062210000 220PF C246 3101052230000 0.022UF C255 3101051050000 C276 3101051050000 C305 3101051050000 C310 3101051050000 C719 3101051050000 C962 3101051050000 C287 3101064740000 0.47UF C1013 3104071060070 10UF C293 3104071060070 10UF C367 3104071060070 10UF C401 3104071060070 10UF C402 3104071060070 10UF...
  • Page 555 Service Manual Ref. No. Part No. Description C727 3101054710010 470PF C746 3101054710010 470PF C945 3101054710010 470PF C713 3101053330000 0.033UF C294 3101063340000 0.33UF C715 3101063340000 0.33UF C716 3101061810010 180PF C940 3101061810010 180PF C977 3101061810010 180PF C198 3101050800000 C6183 3101050800000 C6210 3101050800000 C731 3101050800000 C6066...
  • Page 556 Service Manual Ref. No. Part No. Description C984 3101065610000 560PF C804 3101092260010 22UF C933 3101092260010 22UF C812 3101371010000 100pF C820 3101371010000 100pF C870 3101371010000 100pF C8330 3101376800000 68pF C842 3101376800000 68pF C861 3101068210000 820PF 3101061520010 1500PF C822 3101061520010 1500PF C853 3101061520010 1500PF C990...
  • Page 557 Service Manual Ref. No. Part No. Description C992 3101061010010 100PF C970 3101063910000 390PF C862 3101060200010 C886 3101064720000 4700PF C949 3101062720000 2700PF C819 3101082700010 27pF C841 3101082700010 27pF C856 3101082700010 27pF C891 3101051210000 120PF C899 3101051210000 120PF C802 3101064700000 47PF C986 3101064700000 47PF L833...
  • Page 558 Service Manual Ref. No. Part No. Description R375 3001050000000 0Ω R399 3001050000000 0Ω R426 3001050000000 0Ω R440 3001050000000 0Ω 3001050000000 0Ω R505 3001050000000 0Ω R507 3001050000000 0Ω R508 3001050000000 0Ω R536 3001050000000 0Ω R544 3001050000000 0Ω R564 3001050000000 0Ω R565 3001050000000 0Ω...
  • Page 559 Service Manual Ref. No. Part No. Description D106 3304010100220 Varactor D107 3304010100220 Varactor D108 3304010100220 Varactor D109 3304010100220 Varactor D110 3304010100220 Varactor D111 3304010100220 Varactor D112 3304010100220 Varactor D113 3304010100220 Varactor D116 3304010100220 Varactor D117 3304010100220 Varactor D121 3304010100220 Varactor D122 3304010100220 Varactor...
  • Page 560 Service Manual Ref. No. Part No. Description D917 3302030500030 Zener diode D901 3303040400000 Switching diode D902 3301100300030 Rectifier diode D904 3301240000000 Diode D905 3301240000000 Diode D6100 3303060300010 Switching diode D906 3303060300010 Switching diode D907 3303060300010 Switching diode D909 3303060300010 Switching diode D911 3303060300010 Switching diode...
  • Page 561 Service Manual Ref. No. Part No. Description L709 3221506601000 600Ω L710 3221506601000 600Ω L711 3221506601000 600Ω L712 3221506601000 600Ω L714 3221506601000 600Ω 3221506601000 600Ω L815 3221506601000 600Ω L821 3221506601000 600Ω L824 3221506601000 600Ω L825 3221506601000 600Ω 3221506601000 600Ω R153 3221506601000 600Ω...
  • Page 562 Service Manual Ref. No. Part No. Description L407 3221506300000 30Ω L408 3221506300000 30Ω L409 3221506300000 30Ω L410 3221506300000 30Ω L411 3221506300000 30Ω L412 3221506300000 30Ω L901 3221506300000 30Ω L912 3221506300000 30Ω L913 3221506300000 30Ω L233 3211506101000 100nH L234 3211506101000 100nH L235 3211506101000 100nH...
  • Page 563 Service Manual Ref. No. Part No. Description L832 3212106180000 18nH L830 3233099185900 18.5nH L902 3217299103000 10uH L903 3213099472000 4.7uH L931 3213099472000 4.7uH L904 3221506181000 180Ω L908 3221506181000 180Ω L930 3241799103000 10uH L6015 3221505121010 Bead L6036 3221505121010 Bead L6026 3210106680000 68nH L6027 3210106680000 68nH...
  • Page 564 Service Manual Ref. No. Part No. Description Q101 3403999000000 Transistor Q105 3403999000000 Transistor Q108 3403999000000 Transistor Q112 3403999000000 Transistor Q116 3403999000000 Transistor Q117 3403999000000 Transistor Q102 3401002000990 NPN transistor Q111 3401002000990 NPN transistor Q104 3403003000060 NPN transistor Q702 3403003000060 NPN transistor Q107 3404006000000 NPN transistor...
  • Page 565 Service Manual Ref. No. Part No. Description 1010 3001061010000 100Ω 1011 R823 3001062200000 22Ω 1012 R162 3001058200000 82Ω 1013 R109 3001051000000 10Ω 1014 R175 3001051000000 10Ω 1015 R386 3001051000000 10Ω 1016 R388 3001051000000 10Ω 1017 R414 3001051000000 10Ω 1018 R114 3001066800000 68Ω...
  • Page 566 Service Manual Ref. No. Part No. Description 1054 R251 3001051010040 100Ω 1055 R260 3001051010040 100Ω 1056 R271 3001051010040 100Ω 1057 R278 3001051010040 100Ω 1058 R337 3001051010040 100Ω 1059 R338 3001051010040 100Ω 1060 R339 3001051010040 100Ω 1061 R346 3001051010040 100Ω 1062 R403 3001051010040 100Ω...
  • Page 567 Service Manual Ref. No. Part No. Description 1098 R1110 3001053300010 33Ω 1099 R156 3001053300010 33Ω 1100 R167 3001053300010 33Ω 1101 R178 3001053300010 33Ω 1102 R231 3001053300010 33Ω 1103 R232 3001053300010 33Ω 1104 R292 3001053300010 33Ω 1105 R319 3001053300010 33Ω 1106 R320 3001053300010 33Ω...
  • Page 568 Service Manual Ref. No. Part No. Description 1142 R433 3001053300010 33Ω 1143 R456 3001053300010 33Ω 1144 R457 3001053300010 33Ω 1145 R467 3001053300010 33Ω 1146 R473 3001053300010 33Ω 1147 R474 3001053300010 33Ω 1148 R479 3001053300010 33Ω 1149 R485 3001053300010 33Ω 1150 R486 3001053300010 33Ω...
  • Page 569 Service Manual Ref. No. Part No. Description 1186 R428 3001054720000 4.7K 1187 R435 3001054720000 4.7K 1188 R436 3001054720000 4.7K 1189 R437 3001054720000 4.7K 1190 R448 3001054720000 4.7K 1191 R468 3001054720000 4.7K 1192 R469 3001054720000 4.7K 1193 R470 3001054720000 4.7K 1194 R471 3001054720000 4.7K...
  • Page 570 Service Manual Ref. No. Part No. Description 1230 R341 3001051030000 10KΩ 1231 R342 3001051030000 10KΩ 1232 R343 3001051030000 10KΩ 1233 R351 3001051030000 10KΩ 1234 R353 3001051030000 10KΩ 1235 R372 3001051030000 10KΩ 1236 R377 3001051030000 10KΩ 1237 R378 3001051030000 10KΩ 1238 R379 3001051030000 10KΩ...
  • Page 571 Service Manual Ref. No. Part No. Description 1274 R532 3001051030000 10KΩ 1275 R534 3001051030000 10KΩ 1276 R535 3001051030000 10KΩ 1277 R538 3001051030000 10KΩ 1278 R539 3001051030000 10KΩ 1279 R540 3001051030000 10KΩ 1280 R541 3001051030000 10KΩ 1281 R543 3001051030000 10KΩ 1282 R555 3001051030000 10KΩ...
  • Page 572 Service Manual Ref. No. Part No. Description 1318 R947 3001051020000 1KΩ 1319 R957 3001051020000 1KΩ 1320 R978 3001051020000 1KΩ 1321 R111 3001068200000 82Ω 1322 R835 3001063300000 33Ω 1323 R239 3001055620000 5.6K 1324 R287 3001055620000 5.6K 1325 R573 3001055620000 5.6K 1326 R6205 3001055620000 5.6K...
  • Page 573 Service Manual Ref. No. Part No. Description 1362 R279 3001053030000 30KΩ 1363 R283 3001053030000 30KΩ 1364 R6134 3001053030000 30KΩ 1365 R6137 3001053030000 30KΩ 1366 R265 3001051820000 1.8K 1367 R714 3001051820000 1.8K 1368 R839 3001051820000 1.8K 1369 R152 3001054730000 47KΩ 1370 R266 3001054730000 47KΩ...
  • Page 574 Service Manual Ref. No. Part No. Description 1406 R548 3001054710000 470Ω 1407 R549 3001054710000 470Ω 1408 R550 3001054710000 470Ω 1409 R551 3001054710000 470Ω 1410 R6208 3001054710000 470Ω 1411 R568 3001055120030 5.1K 1412 R570 3001055120030 5.1K 1413 R577 3001055120030 5.1K 1414 R6130 3001055120030 5.1K...
  • Page 575 Service Manual Ref. No. Part No. Description 1450 R895 3001055630000 56KΩ 1451 R858 3001069120000 9.1K 1452 R859 3001061020010 1KΩ 1453 R924 3001061020010 1KΩ 1454 R939 3001061020010 1KΩ 1455 R954 3001061020010 1KΩ 1456 R970 3001061020010 1KΩ 1457 R974 3001061020010 1KΩ 1458 R872 3001051840000 180K...
  • Page 576 Service Manual Ref. No. Part No. Description 1494 R6204 3001052730010 27KΩ 1495 R6109 3001063910000 390Ω 1496 R6113 3001052740000 270K 1497 L811 3001063310010 330Ω 1498 R6129 3001063310010 330Ω 1499 R811 3001063310010 330Ω 1500 T6100 3244599189000 4BLH 1501 T6101 3244599189000 4BLH 1502 U100 3604019000000 PLL IC...
  • Page 577 Service Manual Ref. No. Part No. Description 1538 R934 3001055130010 51KΩ 1539 C718 3101051050160 1540 L106 3214307181000 180nH 1541 C859 3101068200000 82PF 1542 C888 3101068200000 82PF 1543 L6213 3210305560000 56nH 1544 L6216 3210305560000 56nH 1545 L414 3221505121000 120Ω 1546 L415 3221505121000 120Ω...
  • Page 578 Service Manual Ref. No. Part No. Description 1582 L110 3217107102000 1583 L121 3217107102000 1584 L134 3217107102000 1585 L819 3233099470000 47nH 1586 L820 3233099470000 47nH 1587 D900 3302060000000 Zener diode 1588 Q921 3404999000020 NPN transistor 1589 U328 3607082000040 Serial-to-parallel converter 1590 U232 3612044000010 Memory...
  • Page 579 Service Manual 18.8 Troubleshooting Flow Chart Receiver Circuit...
  • Page 580 Service Manual Description of Normal Situations: [1] During sensitivity test, use a communication test set to demodulate the audio signal (TP4012 and TP4016). If the signal is demodulated normally, it is concluded that the front panel is defective. [2] Use the communication test set to input a 44.85MHz IF signal at the mixer, and see whether it can be processed normally afterwards.
  • Page 581 Service Manual Transmitter Circuit...
  • Page 582 Service Manual Description of Normal Situations: [1] The current in analog mode is above 6A under 45W power supply and above 1A under 5W. However, in digital mode, the current will be reduced by 50%. [2] The APC voltage should be above 2V at TP811. [3] Check whether there is an appropriate TX LO signal at TP803.
  • Page 583 Service Manual...
  • Page 584 Service Manual Description of Normal Situations: [1] Detect the oscillation frequency of RX TP123 and TX TP111 using a spectrum analyzer or the communication test set. [2] Check whether switches (Q108, Q112, Q101 and Q105) are turned on and output 4.3V. [3] Check whether the emitter-base voltage of the four transistors (Q106, Q110, Q100 and Q103) is about 0.7V under normal RX/TX status.

  • Page 585: Disassembly And Assembly

    Service Manual 19. Disassembly and Assembly Disassembly 1. Turn off the radio and remove the power cord and antenna. 2. Loosen the three screws to remove the front panel. Then remove the FFC. 3. Detach the volume control knob and loosen the four screws. Then remove the PCB from the control panel.
  • Page 586 Service Manual 6. Loosen the screw fixing the antenna connector and two screws fixing the PA module. Then take the PCB out. Assembly To assemble the radio, perform the above steps in a reverse way. In addition, the following procedures shall be performed: 1.
  • Page 587 Service Manual 4. Connect the palm microphone to the radio (via front-panel connector). When the palm microphone is not in use, hang it on the microphone hanger.
  • Page 588 Service Manual 20. Exploded View 10 11 12 13 14 15 16 17 18 19 20...
  • Page 589 Service Manual Part Number Description Qty. 6300109000000 Aluminum chassis (RoHS) 7500358000000 Heat sink pad (RoHS) 6100492101000 Waterproof ring for front case (RoHS) 4210090000200 Signal cable (RoHS) 5208010100010 Connector (male) 10Pin (RoHS) 6001079000000 Light-guide plate for keys (RoHS) 7300048000000 Metal dome (RoHS) 6100408001000 Waterproof ring for microphone jack (RoHS) 6100488000000...
  • Page 590 Service Manual 6100530100000 Waterproof ring for power socket (RoHS) 5205002100110 Power socket (male) (RoHS) 3103994770150 Electrolytic capacitor (RoHS) 7212002500000 Nut (RoHS) 6100531100000 Waterproof ring for antenna connector (RoHS) 4401000009000 BNC RF connector (RoHS) 6100494000000 Soft stopple for GPS antenna connector (RoHS) 7500159000100 Thermal conductive silicone rubber (RoHS) 7500357000000...
  • Page 591 Service Manual 21. Packing Guide...

  • Page 592: Specifications

    Service Manual 22. Specifications General UHF1: 400-470MHz UHF2: 450-520MHz Frequencies UHF3: 350-400MHz VHF: 136-174MHz Channel Capacity 1024 Zone Capacity (each with a maximum of 16 channels) Channel Spacing 12.5 KHz /20KHz/25 KHz* Operating Voltage 13.6 V ±15% Standby < 0.6A Receive <...
  • Page 593 Service Manual ±5.0KHz@25KHz* -40dB@12.5KHz FM Hum & Noise -43dB@20KHz* -45dB@25KHz* 60dB@12.5KHz Adjacent Channel Power 70dB@20/25KHz* Audio Response +1 ~ -3 dB Audio Distortion ≤3 % Digital Vocoder Type AMBE++ or SELP Digital Protocol ETSI-TS102 361-1,- 2,-3 Receiver 0.3μV (12dB SINAD) Analog 0.22μV (Typical) (12dB SINAD) Sensitivity...
  • Page 594 Service Manual American Military Standard MIL-STD-810 C/D/E/F Dust & Water Intrusion IP54 Standard Humidity Per MIL-STD-810 C/D/E/F Standard Shock & Vibration Per MIL-STD-810 C/D/E/F Standard GPS (for MD78XG only) Accuracy specs are for long-term tracking(95th percentile values>5 satellites visible at a nominal -130dBm signal strength) TTFF (Time To First Fix) Cold <1 minute...
  • Page 595 是海能达通信股份有限公司的商标或注册 商 标 is the trademark or registered trademark of Hytera Communications Corp., Ltd. Hytera Corp., Ltd. All Rights Reserved. 2011 Hytera Corp., Ltd.版权 所有 地址:深 圳市高 新技术 产业园 北区北 环路 好易通大厦 Address: HYT Tower, Hi-Tech Industrial Park North, Beihuan 邮...

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