Troubleshooting Flow Chart
VHF1 (136
‐
174 MHz)
36
[3] Check whether the emitter voltage of Q8002 and Q8007 is about 1.8 V under normal RX/TX status.
[4] Check the CV of TP8002. The normal value should range from 0.5 to 4.5 V.
[5] Check whether the power supplies 5 V and 3.3 V of PLL U8001 is normal.
[6] Check whether the power from PLL U8001.2 is about -15 dBm.
[7] Check whether X8001 outputs a 19.2 MHz signal.
Summary of Contents for MD652
Page 1: ...DIGITAL MOBILE RADIO...
Page 5: ...UHF1 400 470 MHz...
Page 15: ...Exploded View and Packaging Guide UHF1 400 470 MHz 8 3 2 Packaging Guide...
Page 53: ...43 9 PCB View Front Panel PCB View Top Layer X...
Page 54: ...44 Front Panel PCB View Bottom Layer...
Page 55: ...45 Main Board PCB View Top Layer...
Page 56: ...46 Main Board PCB View Bottom Layer...
Page 106: ...VHF1 136 174 MHz...
Page 116: ...Exploded View and Packaging Guide VHF1 136 174 MHz 8 3 2 Packaging Guide...
Page 154: ...43 9 PCB View Front Panel PCB View Top Layer...
Page 155: ...44 Front Panel PCB View Bottom Layer...
Page 156: ...45 Main Board PCB View Top Layer...
