HYT Science and Technology Co TM-800U1 Mobile Radio User Manual
Shenzhen HYT Science &Technology; Co Ltd Mobile Radio
Contents
- 1. Users Manual I
- 2. Users Manual II
Users Manual I
TM-800 UHF SERVICE MANUAL Troubleshooting Flow Charts MCU Check Normal Power-on alert tone? Yes RF circuit can’t be driven No Replace the speaker Yes Read available or not? Check the control circuit No Speaker works well? Yes 9.8304MHz works normally? Yes Yes Q117 works normally? No Replace Q117 Yes Pin10 is of high level? No No Check 5V Yes MCU works well 123 Check read circuit Reset TM-800 UHF SERVICE MANUAL VCO Check Normal power supply? No Replace Q116 No Q706 works normal? Yes Rx oscillates ? And CV voltage is normal? Yes Q705 works normal? No Yes Replace Q706 Check Q703 outputs normally? No Yes Check Q703 Yes Normal feedback? No Check Q124 Yes 16.8MHz oscillates? No Check power supply circuit. Yes Check CPU data circuit. 124 No Replace Q705 TM-800 UHF SERVICE MANUAL No receive Power supply of AF IC126 is normal? No Check power supply circuit. Yes Output of IC126 is normal? Yes FPC & Speaker work normally? No Output of electronics volume IC125 is normal? Yes Check IC126 No Output of IC104 is normal? Yes Check IC125 No Output of IC106 is normal? Yes Check IC104 No Output of IC121 is normal? Yes Check IC106 No The 2nd local oscillator works normally? No Check X105 Yes No L135 works normally? Replace L135 Yes Is there any input in IC119 PIN16 IF? Yes Check work status of IC119 &peripheral components No Yes Is there any RF signal? No Check Q601 pass 125 Check VCO TM-800 UHF SERVICE MANUAL No output Yes Yes Current is normal? No Power supply works normally? No Check power supply circuit Low Check Q131 & Q110 Control voltage is normal? High Check transistor Bias voltage and low pass network Check driver stage. Repair transmission network. Driver stage is normal? No No Check the suited network. Normal Power? Yes Yes Normal power? Completed Completed Replace Q128 Yes Normal power? Completed No Replace Q127 126 Yes VCO maintenance Flow chart TM-800 UHF SERVICE MANUAL Exploded View 41 40 39 38 10 37 11 36 12 35 13 34 14 15 33 16 32 17 31 18 19 30 20 29 28 27 26 25 24 23 127 22 21
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