Troubleshooting Flow Chart
UHF1 (400
‐
470 MHz)
30
6.2
GPS Circuit
Replace U2002
Check resistors
R9006 and R9007
3.3 V output by U2002 is
normal?
Check UART port
Can the radio perform
positioning?
SIRF
Demo software on the
computer displays
communication status?
Start
Replace GPS
module
Check the antenna
Check peripheral
components of the
module
Poor RX signal
Connector is normal?
Active antenna is
damaged?
Replace active
antenna
Replace
connector
W9001
Replace the
antenna
Replace
damaged
components
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Yes
Yes
No
No
No
No
6.3
Transmitter Circuit
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...