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Flow Chart of Troubleshooting
10-16
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10-2.RF
10-2-1. EGSM Rx
Continuous RX ON
RF Input : 62CH
AMP : -50dBm
Check pin #11 of
PAM100
≥
-65dBm
Check pin #29,30 of
U103
≥
-65dBm
Check pin #17 of
U103
≥
2.8V
Check the pin #19,20 of
U103=26Mhz
Check the pin #2,3,22,23 of
U103 Vp-p=120mV
END
Resolder or Change
RFS100,C103,C105,L101,
L
107,L108
Resolder or Change PAM100
Check soldered status of
C117, C124, L103
Resolder or change UCP300
pinA13 C315
Resolder or Change OSC100
Resolder or Change U103
Normal Condition Catch the
channel
Check pin #7 of
PAM100
≥
-65dBm
GSM Receiver is O.K?
GSM RX path component
resolder or change
Check soldered status of
TP101, R100, R102, C100, L100
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO