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Flow Chart of Troubleshooting
9-12. GSM Receiver
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Yes
F100 Pin8
>= -65dBm
Yes
F100 5,6
>= -68dBm
Yes
U101
pin 29 >= -70dBm
pin 30 >= -70dBm
Yes
U101 pin 7,8,9,10
>= 1V
Yes
Check UCP201
END
No
Resolder RFS100,C101
No
No
Resolder C104, C108, L103
No
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Check F100
pin10,pin12 = L
Yes
U101 pin 23,26,31
>=2.8V
Yes
9-20
No
Check ANT Switch
control circuit
Resolder F100
No
Check & Resolder
U101, R125
RF26MHz, RF PSU Part
Resolder U101
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