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Flow Chart of Troubleshooting
9-26
9-15. GSM900 Receiver
RX ON
RF input : CH center freq
Amp : -50dBm
Yes
No
Resolder RFS100, C144, L106
U100 Pin10
>= -65dBm
Yes
Check ANT Switch
control circuit
F100 pin3,4
>= -65dBm
Check U100
pin13 = L, pin14= L
No
No
Yes
Yes
Resoder U100
No
Resolder L107,C108,L134
U101
pin27 >= -70dBm
pin28 >= -70dBm
Yes
No
Resolder U101
or Check pins related to U101
U102 pin 1,2,3,4
>= 500mV
Yes
Check UCP200
END