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Flow Chart of Troubleshooting
9-14. GSM900 Receiver
RX ON
RF input : CH center freq
Amp : -50dBm
Yes
MODULE1 Pin10
>= -65dBm
Yes
MODULE1 pin3,4
>= -65dBm
Yes
U101
pin27 >= -70dBm
pin28 >= -70dBm
Yes
U103 pin 1,2,3,4
>= 500mV
Yes
Check UCP200
END
No
Resolder RFS100, C102, L100
No
No
Resolder L101,L103,L104
No
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Check MODULE1
pin13 = L, pin14= L
Yes
Resolder U101
or Check pins related to U101
9-33
No
Check ANT Switch
control circuit
Resoder MODULE1
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