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Flow Chart of Troubleshooting
9-24
9-13. GSM Receiver
U100 Pin33
≥ -65dBm
Resolder L118~120, C147
Yes
No
Resolder RFS100
C105
≥ -60dBm
Yes
DUF100 Pin5
≥ -60dBm
Replace DUF100
No
Yes
U100 pin
10, 11,12,13
≥ 500mV
No
Resolder U100
or Check pins related to U100
Check U100
Yes
END
RX ON
RF input : CH center freq
Amp : -50dBm
No
Yes