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Flow Chart of Troubleshooting
9-24
9-14. GSM Receiver
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Yes
F100 Pin13
>= -65dBm
No
Resolder RFS100,C103
Yes
Check ANT Switch
control circuit
F100 1,2
>= -68dBm
Check F100
pin9,pin11 = L
No
No
Yes
Yes
Resolder F100
No
Resolder C108, C109, L105
U100
pin 24 >= -70dBm
pin 25 >= -70dBm
Yes
No
U100 pin 11,29,36
>=2.8V
U101 pin 4,5,6,7
>= 1V
No
Check & Resolder
U101
RF26MHz, RF PSU Part
Yes
Yes
Resolder U100
Check UCP200
END