HYT TC-320 Service Manual
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HYT TC-320 Service Manual

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  • Page 1 TC-320...

  • Page 2: Table Of Contents

    Contents 1. Introduction ............................1  2. Product Controls ..........................2  3. Software Specifications ........................6  4. Circuit Description ........................... 10  5. CPU Pins ............................17  6. Parts List 1 ............................21  7. Tuning Description ........................... 31  8. Troubleshooting Flow Chart ......................42  9.

  • Page 3: Copyright Information

    Copyright Information HYT is the trademark or registered trademark of Hytera Communications Co., Ltd. (the Company) in PRC and/or other countries or areas. Hytera 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 4: Introduction

    Service Manual Introduction 1. Introduction Intended User This manual is intended for use by qualified technicians only.

  • Page 5: Product Controls

    Product Controls Service Manual 2. Product Controls (4) Volume Control (1) PTT Key (2) SK (programmable) (3) Speaker Key ( [+]/[-]) (7) Charging (5) Microphone (6) Nameplate (8) Antenna Terminal (10) Channel/Status (11) Channel (12) Charge (9) Power On/Off Key Indicator Selector Knob Indicator...
  • Page 6 Service Manual Product Controls ﹡PTT (Push-to-Talk) Key Hold the PTT key to transmit, and release it to receive. ﹡Programmable Function Key The side key (SK) can be programmed with long/short press functions by your dealer. (Note: Short Press means key press shorter than 1 second, while Long Press means key press longer than 1 second. ） ﹡Channel/Status Indicator See the table below for LED and alert tone indications: Item...
  • Page 7 Product Controls Service Manual Item Indication The Status Indicator glows green during cloning. Status of the target radio in The green Status Indicator goes out once cloning Wired Clone Mode is completed. When the radio is turned on, a power-on alert tone sounds and the Status Indicator flashes orange once.
  • Page 8 Service Manual Product Controls Item Indication The Status Indicator glows green when the PC is writing data into the radio. A low-pitched tone will sound when the radio switches from high power to low power. Power Adjustment A high-pitched tone will sound when the radio switches from low power to high power .

  • Page 9: Software Specifications

    Software Specifications Service Manual 3. Software Specifications Function List Channel Capacity: 16 Channel Spacing: 25KHz/12.5KHz Channel Scan Rx/Tx status indication (red/green LED) CTCSS/CDCSS Encode&Decode (38 groups of CTCSS, 83 groups of CDCSS, and CTCSS Tail Revert of 180 degrees.) Low Battery Alert Battery Save Unlock Detection and Emergency Alarm 2 Selectable Squelch Levels...
  • Page 10 Software Specifications Operations: Step 1 Install PC programming software and its driver dedicated for TC-320 before your initial use. Step 2 Connect the USB port of PC with the Mini USB port of the radio using a programming cable. Step 3 Turn on the radio.
  • Page 11 Software Specifications Service Manual Step 2 During communication, the Status Indicator of the source radio glows red, and the Status Indicator of the target radio glows green. When the communication ends, green LED of the source radio glows and the green LED of the target radio goes out, which indicates the preparation for another clone.
  • Page 12 Service Manual Software Specifications The Status Indicator solidly glows red during TX group tuning (CH1 to CH9). RX group: CH10-CH12 respectively stands for SQL On 5, SQL Off 5, and RX Low Voltage Threshold. The Status Indicator solidly glows green when you are tuning items CH10-CH12. On CH13-CH16, no tuning item can be found and the Status Indicator goes out.

  • Page 13: Circuit Description

    Circuit Description Service Manual 4. Circuit Description General Principle Diagram The general circuit is composed of RDA chip circuit, TX circuit, RX circuit, power supply circuit, control circuit, etc. See the block diagram below: Figure 1 RDA Chip Circuit This chip is highly integrated. Its function includes voice signal processing/modulation/demodulation, DSP, VCO, PLL, LNA and RF IF.
  • Page 14 Service Manual Circuit Description TX Circuit The modulated RF signal from RDA chip goes to Q407 and Q402 for amplification, and then further amplified by Q403. Then the amplified signal is delivered to low-pass filter to filter out the high-order harmonics.
  • Page 15 Circuit Description Service Manual The reference clock signal of RDA chip is provided by 26MHZ crystal oscillator. The block diagram is given below: I ADC I PGA DSP Core Audio filter 0/90 Switch Sub CH filter FM Modem AFC loop Q ADC Q PGA PA_driver...
  • Page 16 Service Manual Circuit Description BIAS DOWN U401 Figure 3 The modulated RF signal from RDA chip goes to Q407 and Q402 for amplification, and then further amplified by Q403. Then the amplified signal is delivered to low-pass filter to filter out the high-order harmonics.
  • Page 17 Circuit Description Service Manual ANT LPF D401 D402 RX_EN Q501 AT41511 BPF1 Figure 4 The RF signal is received via the antenna. After going through LPF and amplitude limiter, the signal is amplified by Q501 LNA. Next, the BPF will remove the interference signal in amplified RF signal. Then the resulting signal goes to RDA chip for further processing.
  • Page 18 Service Manual Circuit Description EXT_PTT /EXT_MIC U622 MC9S08AC60 SDA/SCL CSS/CODE/INT/SDO /RXON/TXON/SQ/PDN Figure5 MCU Control Circuit MCU control circuit is composed of MCU, EEPROM, keys, etc. This section has the following functions: to initialize data of the radio and save data to EEPROM; to detect battery voltage and signals from external keys, LD and VOX, and to make response;...
  • Page 19 Circuit Description Service Manual TX power supply; (for programming) to communicate with PC via RXD/TXD based on the RS232 protocol, and transmit/receive data to/from PC. RDA Chip Control By controlling the RDA chip, the MCU can realize these services: frequency setting, frequency bandwidth, reference clock, sleep mode, SQ, VOX, squelch, frequency deviation, voice filtering, signaling encoding/decoding, pre-emphasizing, gain control, amplitude limiting, de-emphasizing, etc.

  • Page 20: Cpu Pins

    Service Manual CPU Pins 5. CPU Pins PIN No. Pin Name Definition Description POWER PTC4 Power Switch ON/OFF Connected to power switch for IRQ/TPMCLK reviving MCU in power-off mode RESET RESET Reset PTF0/TPM1CH2 BEEP Tone PTF1/TPM1CH3 VRCR PWM output for freq. adjustment PTF2/TPM1CH4 PWM output for PA APC PTF3/TPM1CH5...
  • Page 21 CPU Pins Service Manual PIN No. Pin Name Definition Description PTE6/MOSI1 SDIO SPI port of communication PTE7/SPSCK1 SCLK SPI port of communication Ground Power Supply PTG0/KBI1P0 Detection pin, SQ status check PTG1/KBI1P1 TX_EN TX power supply control PTG2/KBI1P2 RX_EN RX power supply control PTA0 Rotary switch PTA1...
  • Page 22 Service Manual CPU Pins PIN No. Pin Name Definition Description PTB7/AD1P7 R_LED Red LED PTD0/AD1P8 G_LED Green LED PTD1/AD1P9 Reserved Reserved VDDAD VDD_AD Power supply for digital circuit VSSAD VSS_AD Ground (digital) PTD2/KBI1P5/AD1P10 External EEPROM PTD3/KBI1P6/AD1P11 External EEPROM PTG3/KBI1P3 Reserved Reserved PTG4/KBI1P4 Reserved...
  • Page 23 CPU Pins Service Manual PIN No. Pin Name Definition Description PTC3/TxD2 PTC5/RxD2...

  • Page 24: Parts List 1

    Service Manual Parts List 1 6. Parts List 1 Ref No. Print No. Part No. Description Qty. C102 3101051020010 Chip capacitor 1000PF K 50V X7R 0402 (RoHS) C103 3101051000020 Chip capacitor 10PF J 50V C0G 0402 (RoHS) C104 3101051000020 Chip capacitor 10PF J 50V C0G 0402 (RoHS) C105 3101051020010 Chip capacitor 1000PF K 50V X7R 0402 (RoHS)
  • Page 25 Parts List 1 Service Manual Ref No. Print No. Part No. Description Qty. C216 3101051020010 Chip capacitor 1000PF K 50V X7R 0402 (RoHS) C217 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402 (RoHS) C218 3101051050000 Chip capacitor 1UF K 6.3V X5R 0402 (RoHS) C219 3101051020010 Chip capacitor 1000PF K 50V X7R 0402 (RoHS)
  • Page 26 Service Manual Parts List 1 Ref No. Print No. Part No. Description Qty. C439 3101051200020 Chip capacitor 12PF J 50V COG 0402 (RoHS) C440 3101054710010 Chip capacitor 470PF K 50V X7R 0402 (RoHS) C441 3101051040060 Chip capacitor 0.1UF K 16V X7R 0402 (RoHS) C442 3101054710010 Chip capacitor 470PF K 50V X7R 0402 (RoHS)
  • Page 27 Parts List 1 Service Manual Ref No. Print No. Part No. Description Qty. C615 3101051030020 Chip capacitor 0.01UF K 25V X7R 0402 (RoHS) C621 3101062250000 Chip capacitor 2.2UF K 10V X5R 0603 (RoHS) C622 3101054710010 Chip capacitor 470PF K 50V X7R 0402 (RoHS) C623 3101054710010 Chip capacitor 470PF K 50V X7R 0402 (RoHS)
  • Page 28 Service Manual Parts List 1 Ref No. Print No. Part No. Description Qty. C664 3101051030020 Chip capacitor 0.01UF K 25V X7R 0402 (RoHS) C665 3101054710010 Chip capacitor 470PF K 50V X7R 0402 (RoHS) C666 3101054710010 Chip capacitor 470PF K 50V X7R 0402 (RoHS) C667 3101054710010 Chip capacitor 470PF K 50V X7R 0402 (RoHS)
  • Page 29 3310990000160 ESD protection diode 10 5A/ 8/20uS 0603 (RoHS) D664 3310990000160 ESD protection diode 10 5A/ 8/20uS 0603 (RoHS) DOWN 4301080000090 Momentary contact 12VDC 0.05A TC-320 SMD (RoHS) USB connector 5Pin 0.5mm female SMD 9.9*9.2*4.0mm J201 5205005000100 (RoHS) J202 5205006000010...
  • Page 30 Service Manual Parts List 1 Ref No. Print No. Part No. Description Qty. P-MOSFET VDS:-30V ID:-100mA VGS(th):-1.9V SC-75 Q103 3503010000010 (RoHS) N-MOSFET VDS:30V ID:100mA VGS(th):3.0V SC-75 Q104 3503020000030 (RoHS) PNP TRANSISTOR 50V 150mA 70~700 SOT-523 Q201 3411001000000 (RoHS) N-MOSFET VDS:30V ID:100mA VGS(th):3.0V SC-75 Q202 3503020000030 (RoHS)
  • Page 31 Parts List 1 Service Manual Ref No. Print No. Part No. Description Qty. R216 3001052220010 Chip resistor 2.2KΩ F 1/16W 0402 (RoHS) R217 3001054730000 Chip resistor 47KΩ J 1/16W 0402 (RoHS) R218 3001051050000 Chip resistor 1MΩ F 1/16W 0402 (RoHS) R219 3001051030000 Chip resistor 10KΩ...
  • Page 32 Service Manual Parts List 1 Ref No. Print No. Part No. Description Qty. R512 3001051030000 Chip resistor 10KΩ J 1/16W 0402 (RoHS) R514 3001053920000 Chip resistor 3.9KΩ F 1/16W 0402 (RoHS) R515 3001051020000 Chip resistor 1KΩ F 1/16W 0402 (RoHS) R519 3001055100020 Chip resistor 51Ω...
  • Page 33 3608015000210 Power management IC LDO 12V 3.3V 300mA (RoHS) U622 3609042000020 MCU 8 2.8~5V 20MHZ LQFP 64 (RoHS) 4301080000090 Momentary contact 12VDC 0.05A TC-320 SMD (RoHS) X601 3701327610060 Crystal 32.768KHz ±20ppm 12.5pF SMD (RoHS) XT101 3701002660130 TCXO 26MHz 3.135V~3.465V ±2.5ppm 3225 (RoHS) 7000183000000 Heat sink 3*5*1.5mm 00 (RoHS)

  • Page 34: Tuning Description

    Service Manual Tuning Description 7. Tuning Description Required Test Instruments Radio communication test set (HP8921) 1 set 10V/3A regulated DC power supply 1 set Digital voltmeter 1 set Ammeter 1 set Preparations Place the board to be tested on the test fixture (please ensure good connection between each test point and the fixture), and connect the board to a power supply with DC voltage of 3.8V.
  • Page 35 Tuning Description Service Manual Difference between Factory Clone Mode and User Clone Mode 7.2.3 User Clone Mode: Only clone relevant data in user mode (such as frequencies). Test parameters like test frequency, test item and base band parameter will not be cloned. Factory Clone Mode: Clone all the data excluding serial No.
  • Page 36 Service Manual Tuning Description Channel Tunable Frequency Wide Band Narrow Band Max. RX Audio Power Note: Y indicates frequencies available for tuning, and the rest are blank channels without tuning items. Baseband Design In the above window, only the items in “Add” area are applicable to RDA chip. Values of all items are given below:...
  • Page 37 Tuning Description Service Manual Description: Squelch On/Off: to set the threshold value for enabling/disabling the squelch function. Calibrate Wide/Narrow SQ Open/Close: to tune the squelch threshold to compensate the circuit difference. It is recommended to apply the same value to one model. Increasing the value may tighten the squelch, while decreasing may loosen it.
  • Page 38 Service Manual Tuning Description (the item entered depends on the position where the Channel Selector Knob locates). And the Status Indicator will glow red or green according to the specific tuning item. Or connect a programming cable to the radio for real-time tuning in PC Programming Mode. Description of Tuning Items 7.4.2 Switch of Wide/Narrow Bandwidth and Frequency in an Tuning Item...
  • Page 39 Tuning Description Service Manual Specifications Item Condition Measurement Tuning / Remarks Hold PTT+SK to Press UP power on or DOWN to the radio, tune the TX and then go UHF: power. Then to channel 2. 0.5W±0.2W save your I≤0.8A Short press change and go PTT to to another...
  • Page 40 Service Manual Tuning Description Specifications Item Condition Measurement Tuning / Remarks switch the Lvl: off frequency under test. Following wi deband test, long press PTT to perform Narr narrow band 400±50Hz test. Band Short press PTT to switch the frequency under test.
  • Page 41 Tuning Description Service Manual Specifications Item Condition Measurement Tuning / Remarks test. Hold PTT+SK to power on the radio, and then go to channel 6. Short press PTT to Medi switch the frequency. Following wi deband test, long press PTT to perform narrow band test.
  • Page 42 Service Manual Tuning Description Specifications Item Condition Measurement Tuning / Remarks long press PTT to perform narrow band test. Hold Communic Antenna Press Press UP 4.3KHz – PTT+SK to ation Test or DOWN to 4.5KHz Bracket power on Set BPF: or DO tune the audio the radio,...
  • Page 43 Tuning Description Service Manual Note: Make sure that the antenna or load is connected before tuning; rotating the Channel Selector Knob will save the value automatically. Appendix 1: Appendix 1: Reference Value for Source Radio Wide Band Narrow Band Item Freq.
  • Page 44 Service Manual Tuning Description Item Wide Band Narrow Band Max. TX Audio Deviation Rx Item Section Squelch Normal Squelch Tight Squelch Normal Squelch Tight RX Low Voltage Threshold Max. RX Audio Power...

  • Page 45: Troubleshooting Flow Chart

    Troubleshooting Flow Chart Service Manual 8. Troubleshooting Flow Chart TX Circuit Start Low TX power No voice No TX TX LED fails Replace D604 Normal TX power Check TX power supply? supply Check voice path (MIC&D102) D604 glows red? TX VCO locked? Check TX VCO Replace D604 Check TX path...
  • Page 46 Service Manual Troubleshooting Flow Chart RX Circuit...
  • Page 47 Troubleshooting Flow Chart Service Manual Start Normal power-up alert tone? Normal speaker? Replace it Check U601, Normal MCU U602, U604, VCC? and U606 Normal MCU Replace X601 X601? Check pin Other control pins connection or are normal? reburn the program MCU is OK...

  • Page 48: Disassembly And Assembly

    Service Manual Disassembly and Assembly 9. Disassembly and Assembly Disassembly Step 1 Powering off the radio Step 2 Removing the belt clip Step 3 Removing the battery 1. Push the battery latch upwards; 2. Remove the battery cover; 3. Take out the battery by lifting its bottom side. Step 4 Removing the antenna...
  • Page 49 Disassembly and Assembly Service Manual Step 5 Removing the Channel Selector Knob, nut and waterproof ring 1. Detach the Channel Selector Knob cover; 2. Unfasten the screw; 3. Remove the channel selector knob; 4. Remove the nut and waterproof ring. Step 6 Disassembling the radio chassis and the cover of PTT key 1.
  • Page 50 Service Manual Disassembly and Assembly Step 7 Disassembling the main PCB 1. Remove the two fixing screws on the PCB; 2. Remove the PCB and supporting ring of the Channel Selector Knob. 3. Beware of the speaker cable and the charging piece at the bottom. 整机充电极片...
  • Page 51 Disassembly and Assembly Service Manual 5. Don’t damage the speaker cable during installation. 整机充电极片 Charging Pieces Step 2 Assembling the chassis 1. Assemble the cover of PTT key; 2. Assembling the chassis; 3. Attach and secure the four fixing screws (Note: Control torsion force within 1.8-2.2kgf). Step 3 Assembling the nut and Channel Selector Knob on the top 1.
  • Page 52 Service Manual Disassembly and Assembly 4. Attach and secure the Channel Selector Knob cover; Step 4 Assembling the antenna Step 5 Attaching the battery 1. Load the battery; 2. Attach the battery cover.
  • Page 53 Disassembly and Assembly Service Manual Step 6 Attaching the belt clip...

  • Page 54: Exploded View

    Service Manual Exploded View 10. Exploded View 29 30...

  • Page 55: Parts List 2

    Parts List 2 Service Manual 11. Parts List 2 Part No. Description Qty. 6201658001010 Encoder knob cover 7102006000100 Machine screw M2.0*6.0mm 6000718100000 Encoder knob 7206007400000 Encoder switch nut 6100335000000 Antenna O_Ring 6000737100010 Light guide of charging LED 6000736100000 Light guide for signal LED 6100363000010 POWER key 6201644000000...
  • Page 56 Service Manual Parts List 2 Part No. Description Qty. 7000181000000 Fender washer (open) 6000836000010 Belt clip 7102505000200 Machine screw M2.5*4.8mm 7000206000000 Shaft for belt clip 6000758000000 Battery (thick) cover 7000179000000 Spring for battery latch 6000738000000 Battery latch 7102008020100 Self-tapping screw 2.0*8.0mm 7400233000000 PCB shield sheet 7400034000000...
  • Page 57 Parts List 2 Service Manual Part No. Description Qty. 5002230000010 6100111000010 Silicone rubber MIC cover 7400077000000 MIC Net 6000732001040 Front case 6300062001010 Decorative sheet, zinc alloy 6100365000000 Silicone rubber PTT key 6000735000020 PTT key Antenna Note: Parts that are not marked with part number may vary with radio frequency band.

  • Page 58: Packing Guide

    Service Manual Packing Guide 12. Packing Guide...

  • Page 59: Pcb View

    13. PCB View PCB View Top Layer...
  • Page 60 PCB View Bottom Layer...

  • Page 61: Level Diagram

    14. Level Diagram 24dBm 13dBm 2450m Vrms 7dBm 37.5dBm 90m Vrms Q407 AF AMP Q402 Q403 2SC3356 RD01 RD07 U302 120m Vrms 36dBm -123dBm DAC/ADC 37dBm ANT LPF -122dBm D401 D402 -121.5dBm U101 RDA1846 Q501 AT41511 -109dBm -113dBm BPF1 ５８...

  • Page 62: Block Diagram

    15. Block Diagram B201 SP_JACK PJ-D3027D MICJACK Q407 Q402 Q403 2SC3356 RD01 RD07 AF AMP U302 VOX_DET U613 D656 BATTERY G602 D602 BIAS DOWN EXT_PTT /EXT_MIC U401 D601 DAC/ADC U622 ANT LPF MC9S08AC60 D401 D402 E2ROM SDA/SCL U603 VRCR CSS/CODE/INT/SDO /RXON/TXON/SQ/PDN U101 RDA1846...

  • Page 63: Schematic Diagram

    16. Schematic Diagram Schematic Diagram (IF) L112 L112 L107 L107 601s 601s 601s 601s R101 R101 L110 L110 C102 C102 1000p 1000p C105 C105 C106 C106 C107 C107 C108 C108 C123 C123 C120 C120 1000p 1000p 0.1u 0.1u 1000p 1000p 0.1u 0.1u 0.1u...
  • Page 64 470p 470p 470p 470p 470p 470p 470p 470p 470p 470p 470p 470p 470p 470p 470p HYT Science&technology Co.Ltd. HYT Science&technology Co.Ltd. HYT Science&technology Co.Ltd. 221s 221s VOUT ADUC ADUC ADUC ADUC ADUC ADUC Model Name: Model Name: Model Name: ADUC...
  • Page 65 12nH D505 D505 C511 C511 C512 C512 HSM88AS HSM88AS R511 R511 2.2nH 2.2nH C518 C518 Model Name: TC-320 Page: Date: Part Name: Part Name: Part Name: Tuesday, February 21, 2012 ６２ File No.: Rev: Prepare: Check: Check: Check: Approve: Approve:...

  • Page 66: Specifications

    Service Manual Specifications 17. Specifications General Frequency Range 400 – 470MHz Channel Capacity Channel Spacing 25 KHz /12.5KHz Operating Voltage 3.8V DC Battery 1650mAh Battery Life (5-5-90 Duty Cycle) ≥10hours Operating Temperature -20℃ – +55℃ Dimensions (H×W×D) 100X48X31mm (with standard battery, without antenna) Weight (with standard antenna &...
  • Page 67 Specifications Service Manual Transmitter RF Power Output Spurious and Harmonics ≤-26dBm Modulation Limiting ≤5(W)/≤2.5KHz(N) FM Noise ≥45(W)/≥40dB(N) Modulation Distortion ≤5% Adjacent Channel Power ≤-65(W)/-60dB(N) Note: All Specifications are tested according to TIA/EIA-603, and subject to change without notice due to continuous development.
  • Page 68 8130032000400 L07157 2012-08-08...

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