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Flow Chart of Troubleshooting
9-19
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9-2.RF
9-2-1. GSM900 Receiver
**If you check the rx chain,
Check not only RF Devices but also resistors, inductors and capacitors.
Check C136
≥
-65dBm ?
YES
NO
Check L108
≥
-70dBm ?
U201 Check
Pin#11, 12, 13,14
≥
500mV ?
Resolder RFS100
Replace F100
Resolder U201 or check pins
related to U201
NO
NO
YES
YES
Continuous RX ON
RF Input : 60 CH
AMP : -50dBm
THE END
YES
Check U201