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Flow Chart of Troubleshooting
10-21
10-2. RF
10-2-1. GSM900 Receiver
CONTINUOS RX ON
RF INPUT : 62CH
Cell power : -50dBm
NORMAL CONDITION
catch the channel?
CHECK
L105,L108,C105
NO
1
YES
PAM100 CHECK
pin12
≥
-65dBm?
RFS100
resolder or change
2
NO
YES
PAM100 CHECK
pin16
≥
-65dBm?
PAM100
resolder or change
NO
3
U100 CHECK
pin24,25
≥
-65dBm?
YES
F100,C101,
C100,C104,L100
resolder or change
NO
4
YES
check UCP300
NO
the power source
of U100
5
6
YES
check OSC100
and
change
U100 CHECK
Pin34,35
:26MHz
NO
YES
END
GSM Receiver is ok?
GSM RX path component
resolder or change
NO