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Flow Chart of Troubleshooting
9-16
9-9. GSM850 Receiver
RX ON
Cell Power : -60dBm
PAM100 Pin15
≥
-65dBm
①
Yes
Resolder PAM100, L108, L109,
C132, C134, L110
No
Yes
No
Check PAM100 Pin9,
Pin10 = L
PAM100 Pin18
≥
-68dBm
Check ANT Switch
control circuit
No
②
Yes
Resolder PAM100
Yes
③
F101
Pin 8
≥
-70dBm
Pin 9
≥
-70dBm
Resolder F101, L126, C146
No
Yes
Resolder L120, L124, L122, L123
Check UCP200
END