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Flow Chart of Troubleshooting
10-17
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10-2.RF
10-2-1. EGSM Rx
Continuous RX ON
RF Input : 62CH
AMP : -50dBm
Check pin #17 of
PAM100
≥
-65dBm
Check pin #17 of
U100
≥
2.8V
Check the pin #19,20 of
U100=26Mhz
Check the pin #2,3,22,23 of
U100 Vp-p=120mV
END
Resolder or Change
RFS100,C108,C111,L102,L103,L104
Resolder or Change PAM100
Resolder or change U300
pinA13 C312
Resolder or Change osc101
Resolder or Change U100
Normal Condition Catch the
channel
Check pin #12 of
PAM100
≥
-65dBm
GSM Receiver is O.K?
GSM RX path component
resolder or change
Check soldered status of
ANT, C109,R104, C127, C101
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
Summary of Contents for SGH-B300
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