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8-4-2. GSM900 RX
**If you check the tx chain,
Check the not only RF Device but also resistor, inductor and capacitor.
Continuous Rx ON
RF Input : 62 CH
Amplitude : -50dBm
Normal Condition
Catch the channel?
Check L107 >= -55 dBm?
Resolder U103 or Change
Yes
Yes
Yes
The End
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No
Check Antenna Contact
No
Replace PAM100
8-33
Level 3 Repair
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