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Flow Chart of Troubleshooting
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7-23
12. GSM Receiver
U100 Pin7
>= -65dBm
Resolder RFS100, C102
END
No
Yes
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Check U100
pin2,pin4,pin8 = L
U100 pin5
>= -65dBm
F100 pin1
>= -67dBm
U102 pin7, 8, 9, 10
>= 1V
U102
pin29 >= -70dBm
pin30 >= -70dBm
Check ANT Switch
control circuit
Resolder U100
Resolder F100, C104, L102
Resolder C103, C105, L101
Check U102
pin 23,26,31 >=2.7V
Check & Resolder
U102, R103, R104
RF26MHz, RF PSU Part
Resolder U102
R112, R113, R114,
R115 >= 1V
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Check U200