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Flow Chart of Troubleshooting
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7-13
7-8. EGSM Reciever
F100 CHECK
pin#9 ≥ -65dBm ?
CONTINUOUS RX ON
RF INPUT : 62CH
AMP : -50dBm
NORMAL CONDITION
catch the channel?
U100 CHECK
pin#31 : 26MHz ?
Vp-p : 860mV?
F100 CHECK
pin#11 ≥ -65dBm ?
U100 CHECK
pin#21,22 ≥ -65dBm ?
Check soldered status of
C108, L111, L102
CN100
resolder or change
F100, C127, L108
resolder or change
C131,C132,L109
resolder or change
U102 CHECK
clean 3V?
CHECK
U300
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
U102 CHECK
26MHz ?
Vp-p : 950mV?
U102
Resolder or
Change?
YES