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Flow Chart of Troubleshooting
9-20
9-12. GSM Receiver
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Yes
F100 Pin13
>= -65dBm
No
Resolder
CN100,C104
Yes
Check ANT Switch
control circuit
F100 Pin1,2
>= -68dBm
Check F100
pin9,pin10
= L
No
No
Yes
Yes
Resolder F100
No
Resolder
C116, C119, L113
U101
pin 23
>= -70dBm
pin 24
>= -70dBm
Yes
No
U101
pin12,13,28,29
>=2.8V
U101
pin 4,5,6,7
>= 1V
No
Check & Resolder
U101,
RF PSU
Part
Yes
Yes
Resolder U101
Check
UCP200
END