HYT POWER446 Service Manual

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POWER446

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Page 1 POWER446...
Page 2: Table Of Contents
Contents Revision History ---------------------------------------------------------------------------------------------------------1 Copyright Information -------------------------------------------------------------------------------------------1 Disclaimer------------------------------------------------------------------------------------------------------------------------1 Product Overview----------------------------------------------------------------------------------------------------------2 Product Controls---------------------------------------------------------------------------------------------------------------3 Software Specifications------------------------------------------------------------------------------------------------------4 Circuit Description------------------------------------------------------------------------------------------------------7 CPU Pins-------------------------------------------------------------------------------------------------------15 Parts List 1---------------------------------------------------------------------------------------------------------19 Tuning Description --------------------------------------------------------------------------------34 Troubleshooting Flow Chart--------------------------------------------------------------------------------------------42 Disassembly and Assembly-----------------------------------------------------------------------------------------------45 Exploded View------------------------------------------------------------------------------------------------------47 Parts List 2--------------------------------------------------------------------------------------------------------48 Packing Guide--------------------------------------------------------------------------------------------------------50 PCB View-------------------------------------------------------------------------------------------------------51 Level Diagram------------------------------------------------------------------------------------------------------53 Block Diagram------------------------------------------------------------------------------------------------------54 Schematic Diagram--------------------------------------------------------------------------------------------------------55 Specifications-----------------------------------------------------------------------------------------------------------------58...
Page 3: Revision History
Initial Release Copyright Information HYT 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 4: Product Overview
POWER446 Service Manual Product Overview Intended User This manual is intended for use by qualified technicians only.
Page 5: Product Controls
POWER446 Service Manual Product Controls Part Name Part Name Part Name ○ ○ ○ PTT Key SK1 (programmable) SK2 (programmable) ○ ○ ○ Speaker Microphone Antenna Radio On-Off/Volume ○ ○ ○ LED Indicator Channel Selector Knob Control Knob ○ ○...
Page 6: Software Specifications
POWER446 Service Manual Software Specifications Description of Modes User Mode It is a conventional communication mode. The radio will enter this mode by default after power-on. PC Programming Mode You can use the programming software to access this mode and to set appropriate radio functions and tuning parameters.
Page 7 POWER446 Service Manual Manual Tune Mode Hold down PTT and SK2 on the radio while powering it on, and the radio enters Manual Tune Mode (Note: To enter the Manual Tune Mode, make sure its switch is set to Open via the programming software.)
Page 8 POWER446 Service Manual 4. To switch within narrow bands Under a certain tuning item, long press PTT (the LED flashes orange to indicate valid press) to enter narrow bands; short press PTT to switch the frequency orderly. 5. To tune the value Short press SK1 to increase the value in step of 1, or hold down this key to successively increase the value in steps of 1.
Page 9: Circuit Description
POWER446 Service Manual Circuit Description 1 PLL Frequency Synthesizer The PLL circuit mainly provides the local oscillator signal for RX and RF carrier signal for TX. It is composed of VCO and the baseband processor IC, allowing frequency tracking and channel switching under the control of MCU signals.
Page 10 POWER446 Service Manual Q652 performs switching between transmission and reception under the control of T/R: in TX mode, T/R is set to low level and Q653 is turned on, making Q100 operate; in RX mode, T/R is set to high level and Q653 is cut off, making Q101 operate.
Page 11 POWER446 Service Manual peripheral components) to effectively eliminate out-of-band interference and to obtain pure RX RF signals. Finally, the signals feed to the mixer circuit. The electrically tunable control signal (its level can be obtained by searching the corresponding table, or calculated by the formula) is provided by MCU, so that the varactor can operate within an appropriate voltage range.
Page 12 POWER446 Service Manual MCU outputs appropriate PWM waveform according to the selected channel. This waveform is then rectified by the RC filter circuit (R441, R442, C440 and C441) to generate level of APC/TUNE control signal. One flow of the signal goes to R500 to serve as control voltage of the RX electrically tunable circuit.
Page 13 POWER446 Service Manual TX signaling processing: MCU outputs, via the QTO port, signaling code waveform, which is divided via RC circuit into two flows. One flow modulates the reference frequency oscillator of PLL directly, while the other flow modulates VCO. Note: VR260 adjusts the amplitude proportion between the two flows, to optimize the signaling waveform modulated on the carrier.
Page 14 POWER446 Service Manual 6. MCU Control Section U609 A T 2 4 C 6 4 Channel SW 1.vox 2.BUSY_DET 3.BEEP/CALL U605 4.T/R APC/TUNE 5.SAVE 6.DC/CTC 7.W/N 8.UART MB95F108AK 9.BAT_DET 10.PLL_LD WPFV-GE1 7.3728M晶体 U610 X601 Reset Figure 8 MCU operates at the clock frequency of 7.3728MHz. The MCU control circuit is mainly composed of MCU, EEPROM, reset IC, keys and knobs etc.
Page 15 POWER446 Service Manual To transfer programming data; To process the code of Channel Selector knob; To encode and decode signaling; To transfer data of baseband processing chip (PLL). 7. Power Supply Processing Figure 9 After power-on, one flow of battery voltage is filtered by L604 and C682, and then goes to the RF power amplifier and audio power amplifier for amplification.
Page 16 POWER446 Service Manual 8. VOX Realization Circuit Q202 VCC_5V 2SA1832 R206 1K EXPTT R207 R208 C212 100K R205 0.1U R204 470 C213 MIC_EN Q201 2SK1824 C260 R202 100 220P C274 R203 R251 0.01U MICJACK 4.7K TP200 C202 0.1U L200 C201...
Page 17: Cpu Pins
POWER446 Service Manual CPU Pins Description Pin No. Port Name Pin Name A/D power supply pin; to connect with the AVcc power supply. A/D reference input pin; to connect with the power supply. PTT key input pin (connected with external PE3/INT13 pull-up resistor) (valid at low level) .
Page 18 POWER446 Service Manual connected to GND.) 5V power supply pin (During programming, this pin is connected with VCC.) Not used as I/O; a capacitor is connected between the pin and the grounded Vss. PG2/X1A OSC32K Subordinate crystal oscillator pin (reserved)
Page 19 POWER446 Service Manual P20/PPG00 CTC_DCS CTCSS/CDCSS output pin P21/PPG01 Reserve Reserved Beep tone/Call tone output pin P22/TO00 TONE Wide/narrow band control pin (L: wide; H: P23/TO01 narrow) P24/EC0 Reserve Reserved EEPROM clock pin P50/SCL0 EEPROM data pin P51/SDA0 APC/TUNE pin...
Page 20 POWER446 Service Manual P32/AN02 Reserve Reserved VOX detection input pin P31/AN01 Reserve I/AD P30/AN00 Reserve Reserved For grounding AVss...
Page 21: Parts List 1
POWER446 Service Manual Parts List 1 Part No. Description Qty. Ref No. Print No. 3001050000000 Chip resistor 0Ω J 1/16W (RoHS) C222 3001050000000 Chip resistor 0Ω J 1/16W (RoHS) 3001050000000 Chip resistor 0Ω J 1/16W (RoHS) R248 3001050000000 Chip resistor 0Ω J 1/16W (RoHS) R269 3001050000000 Chip resistor 0Ω...
Page 22 POWER446 Service Manual Part No. Description Qty. Ref No. Print No. 3001051020000 Chip resistor 1KΩ F 1/16W (RoHS) R657 3001051020000 Chip resistor 1KΩ F 1/16W (RoHS) R658 3001051020000 Chip resistor 1KΩ F 1/16W (RoHS) R670 3001051020000 Chip resistor 1KΩ F 1/16W (RoHS) R694 3001051030000 Chip resistor 10KΩ...
Page 23 POWER446 Service Manual Part No. Description Qty. Ref No. Print No. 3001051230000 Chip resistor 12KΩ J 1/16W (RoHS) R313 3001051230000 Chip resistor 12KΩ J 1/16W (RoHS) R314 3001051230000 Chip resistor 12KΩ J 1/16W (RoHS) R315 3001051230000 Chip resistor 12KΩ J 1/16W (RoHS) R504 3001051240000 Chip resistor 120KΩ...
Page 24 POWER446 Service Manual Part No. Description Qty. Ref No. Print No. 131 3001053320000 Chip resistor 3.3KΩ J 1/16W(RoHS) R115 132 3001053320000 Chip resistor 3.3KΩ J 1/16W(RoHS) R230 133 3001053320000 Chip resistor 3.3KΩ J 1/16W(RoHS) R236 134 3001053320000 Chip resistor 3.3KΩ J 1/16W(RoHS) R263 135 3001053320000 Chip resistor 3.3KΩ...
Page 25 POWER446 Service Manual Part No. Description Qty. Ref No. Print No. 175 3001054740000 Chip resistor 470KΩ J 1/16W (RoHS) R642 176 3001054740000 Chip resistor 470KΩ J 1/16W (RoHS) R648 177 3001054790000 Chip resistor 4.7Ω J 1/16W (RoHS) R249 178 3001054790000 Chip resistor 4.7Ω J 1/16W (RoHS) R255 179 3001055610000 Chip resistor 560Ω...
Page 26 POWER446 Service Manual Part No. Description Qty. Ref No. Print No. 219 3101050600010 Chip capacitor 6PF B 50V(RoHS) C120 220 3101050600010 Chip capacitor 6PF B 50V(RoHS) C130 221 3101050600010 Chip capacitor 6PF B 50V(RoHS) C141 222 3101050600010 Chip capacitor 6PF B 50V(RoHS)
Page 27 POWER446 Service Manual Part No. Description Qty. Ref No. Print No. 263 3101051020010 Chip capacitor 1000PF K 50V(RoHS) C408 264 3101051020010 Chip capacitor 1000PF K 50V(RoHS) C414 265 3101051020010 Chip capacitor 1000PF K 50V(RoHS) C439 266 3101051020010 Chip capacitor 1000PF K 50V(RoHS)
Page 28 POWER446 Service Manual Part No. Description Qty. Ref No. Print No. 307 3101051040060 Chip capacitor 0.1UF K 16V(RoHS) C212 308 3101051040060 Chip capacitor 0.1UF K 16V(RoHS) C217 309 3101051040060 Chip capacitor 0.1UF K 16V(RoHS) C231 310 3101051040060 Chip capacitor 0.1UF K 16V(RoHS) C240 311 3101051040060 Chip capacitor 0.1UF K 16V(RoHS)
Page 29 POWER446 Service Manual Part No. Description Qty. Ref No. Print No. 351 3101051050000 Chip capacitor 1UF K 6.3V(RoHS) C307 352 3101051050000 Chip capacitor 1UF K 6.3V(RoHS) C309 353 3101051050000 Chip capacitor 1UF K 6.3V(RoHS) C310 354 3101051050000 Chip capacitor 1UF K 6.3V(RoHS) C440 355 3101051050000 Chip capacitor 1UF K 6.3V(RoHS)
Page 30 POWER446 Service Manual Part No. Description Qty. Ref No. Print No. 395 3101054710010 Chip capacitor 470PF K 50V(RoHS) C316 396 3101054710010 Chip capacitor 470PF K 50V(RoHS) C335 397 3101054710010 Chip capacitor 470PF K 50V(RoHS) C337 398 3101054710010 Chip capacitor 470PF K 50V(RoHS)
Page 31 POWER446 Service Manual Part No. Description Qty. Ref No. Print No. 439 3101056820000 Chip capacitor 6800PF K 25V(RoHS) C239 440 3101056830000 Chip capacitor 0.068UF K 6.3V(RoHS) C227 441 3101060100010 Chip capacitor 1PF B 50V(RoHS) C125 442 3101060100010 Chip capacitor 1PF B 50V(RoHS)
Page 32 POWER446 Service Manual Part No. Description Qty. Ref No. Print No. 483 3210306561010 Multi-layer chip inductor560nH K 35mA 1.55ohm (RoHS) L304 484 3210406331000 Multi-layer chip inductor330nH K 35mA 0.85ohm (RoHS) L303 485 3210406331000 Multi-layer chip inductor330nH K 35mA 0.85ohm (RoHS) L306 486 3212105470000 Multi-layer chip inductor47nH J 200mA 0.58ohm (RoHS)
Page 33 POWER446 Service Manual Part No. Description Qty. Ref No. Print No. 527 3401002000990 NPN transistor10V 30mA (RoHS) Q102 528 3401002000990 NPN transistor10V 30mA (RoHS) Q103 529 3401002000990 NPN transistor10V 30mA (RoHS) Q104 530 3401002000990 NPN transistor10V 30mA (RoHS) Q105 531 3401002000990 NPN transistor10V 30mA (RoHS)
Page 34 POWER446 Service Manual Part No. Description Qty. Ref No. Print No. 571 3302030500020 Zener diode 18V (RoHS) D610 572 3399990000080 Zener diode 6.8V (RoHS) D210 573 3399990000080 Zener diode 6.8V (RoHS) D220 574 3399990000080 Zener diode 6.8V (RoHS) D250 575 3399990000080 Zener diode 6.8V (RoHS)
Page 35 POWER446 Service Manual Part No. Description Qty. Ref No. Print No. 615 3001054730010 Chip resistor 47KΩ F 1/16W (RoHS) R513 616 3001052710010 Chip resistor 270Ω J 1/16W (RoHS) R503 617 3001052710010 Chip resistor 270Ω J 1/16W (RoHS) R516 618 3001052710010 Chip resistor 270Ω J 1/16W (RoHS) R517 619 3001052710010 Chip resistor 270Ω...
Page 36: Tuning Description
POWER446 Service Manual Tuning Description I 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 Preparation 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.
Page 37 POWER446 Service Manual CDCSS Deviation CTCSS Deviation(67Hz) CTCSS Deviation(151.8H CTCSS Deviation(254.1H MSK Deviation (reserved) VOX Level 1 VOX Level 2 VOX Level 3 VOX Level 4 VOX Level 5 TX Low Voltage Threshold RX Item SQL On 1 SQL On 5...
Page 38 POWER446 Service Manual Tune VR300 with ceramic tuning tool Set to CH2 and hold Communicat to control the Frequency Antenna VR300 ≤150Hz down PTT to transmit. ion Test Set center frequency Tolerance within the error range. Tune TC100 with ceramic tuning tool...
Page 39 POWER446 Service Manual (2) Tuning in the mode (Note: Make sure that the antenna or load is connected before tuning.) Measurement Tuning Specifications Item Condition Test Test /Remarks Part Method Instrument Point Set to CH4 and Press SK1 or 4-4.3W...
Page 40 POWER446 Service Manual Enter the Set to CH6, CH7 Tuning Mode if and CH8 necessary, and respectively, and press SK1 or hold down PTT to Communicatio 350~600Hz VR601 SK2 to make CTCSS enable this n Test Set (380~420Hz is Antenna...
Page 41 POWER446 Service Manual Apply SK1 or SK2 to perform Communicatio Set to CH13 and tuning, and n Test Set Level rotate the BPF: Press Channel <20Hz~15kHz SK2 to enable Selector knob AF: 1kHz this function. to save it after 3.5mV one-point tuning.
Page 42 POWER446 Service Manual to switch the Communicatio value after frequency. n Test Set five-point Squelch level SSG: -113dBm tuning. (Level 9): MOD: 1KHz SINAD: DEV: 1.5KHz 20±1dB Filter: 0.3~3KHz Communicatio Tune the SSG n Test Set output signal to SSG: -123dBm squelch level.
Page 43 POWER446 Service Manual Appendix 1: Reference Value for Source Radio Wide Bandwidth Narrow Bandwidth Item Freq. Freq. Freq. Freq. Freq. Freq. Freq. Freq. Freq. Freq. TX Preset Power TX Low Power TX High Power 1111 1076 1055 1047 1072 CDCSS Deviation...
Page 44: Troubleshooting Flow Chart
POWER446 Service Manual Troubleshooting Flow Chart TX Circuit Start Low TX LED fails to Replace No sound power transmission glow/flash. D602. Normal TX Check the TX power supply? power supply. Check the voice channel (MIC,VR200, LED of D602 TX VCO...
Page 45 POWER446 Service Manual RX Circuit Start No signal received Check the RX The RX circuit is power supply normally supplied? circuit. The RX LED works The RX frequency is Change the RX normally? set correctly ? frequency. The RX signaling is set...
Page 46 POWER446 Service Manual Start Normal power-on alert? The speaker Replace the works normally? speaker. Normal VCC (operating voltage of Check U606. MCU)? Clock crystal (X601) of MCU works Replace X601. normally? Check pin Other pins control connection, or normally? reprogram.
Page 47: Disassembly And Assembly
POWER446 Service Manual Disassembly and Assembly Disassembling the Aluminum Chassis ① Remove the volume control knob. ② Remove the channel selector knob. ③ Unscrew the nut for the volume control knob. ④ Unscrew the nut for the channel selector knob.
Page 48 POWER446 Service Manual Figure 3 Assembling the Aluminum Chassis To assemble the aluminum chassis, please perform the above steps in a reverse way.
Page 49: Exploded View
POWER446 Service Manual Exploded View...
Page 50: Parts List 2
POWER446 Service Manual Parts List 2 Part Number Description Qty. Antenna cap 00 6000374000000 (RoHS) Antenna sleeve 00 6001311000000 (RoHS) 6000845100020 Encoder knob 02 (RoHS) 6201739000000 Inner lining of knob 00 (RoHS) 6001315000000 Antenna washer 00 (RoHS) 7400366000000 PC pad for antenna...
Page 51 POWER446 Service Manual 6000700000000 Plug for earpiece jack cover 00 (RoHS) 6000848000010 Earpiece jack cover 01 (RoHS) 6000847000000 Light guide 00 (RoHS) 6100334000000 O-ring for encoder switch 00 (RoHS) 7207002200200 Nut 00(RoHS) 6202157000000 Inner lining of volume control knob 00 (RoHS)
Page 52: Packing Guide
POWER446 Service Manual Packing Guide...
Page 53: Pcb View
POWER446 PCB View Top Layer...
Page 54 POWER446 PCB View Bottom Layer...
Page 55: Level Diagram
POWER446 Level Diagram TX PART 12mVrms 450mVrms 150mVrms -45dBm -26dBm -8dBm 3dBm 15dBm 22dBm 29dBm 27dBm buffer stimulator power AMP Q400 2SC5108 Q400 2SC5108 Q401 2SK4988 Q401 2SK4988 AN29160 AN29160 MICROPHONE MICROPHONE Q402 Q402 Q403 Q403 Q100 Q100 Q104 Q104...
Page 56: Block Diagram
POWER446 Block Diagram TC-610&620 UHF ANTENNA ANTENNA BLOCK DIAGRAM Q403 Q402 Q103 RF PA Q400 Q400 Q104 Q104 Q401 Q401 U609 MATCH R/TSW L453 L453 Q102 pre-amplifier green green BUFFER D602 D601 D100 D100 APC/TUNE U430 L101 L101 Q100 Q100...
Page 57: Schematic Diagram
POWER446 Schematic Diagram (AF&IF&PLL) V_SAVE L308 L308 1K*4 1K*4 PLLEN VCC_5V C253 C253 C320 1000P C320 1000P L301 L301 C323 1000P C323 1000P PLLDATA R303 R303 L300 L300 C316 C316 X300 X300 PLLCLK L309 L309 0.1U 0.1U 1.8K 1.8K 470p 470p 12.8MHz...
Page 58 POWER446 Schematic Diagram (MCU&POWER) VCC_5V APC/TU U609 U609 TX_C PLLCLK AT24C64 AT24C64 PLLDATA DATA C642 C642 PLLEN 0.1u 0.1u R690 R690 V_BAT R698 R698 R695 R695 C667 C667 D601 D601 D602 D602 C666 C666 R696 R696 MIC_EN 1000P 1000P GREEN...
Page 59 POWER446 Schematic Diagram (VCO&RF) L513 L513 ANTENNA ANTENNA V_SAVE V_SAVE C443 C443 R110 R110 C139 C139 L113 L113 C135 C135 L114 L114 R116 10 R116 10 C402 C402 R404 1.5K R404 1.5K C405 C405 C450 C450 C456 C456 C429 C429...
Page 60: Specifications
POWER446 Service Manual Specifications General Frequency Range 446.00625-446.09375MHz Channel Capacity Channel Spacing 12.5KHz Operating Voltage 7.4V DC Battery 2000mAh Li-Ion battery Battery Life (5-5-90 Duty Cycle) ≥25H (2000mAh) Operating Temperature -25℃～+65℃ Frequency Stability ±2.5ppm Receiver Sensitivity ≤ 0.282uV Adjacent Channel Selectivity ≥60dB...
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