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Flow Chart of Troubleshooting
7-10. GSM Receiver
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Yes
U101 Pin7
>= -65dBm
Yes
U101 pin5
>= -65dBm
Yes
F101 pin1
>= -67dBm
Yes
U102
pin29 >= -70dBm
pin30 >= -70dBm
Yes
U102 pin7, 8, 9, 10
>= 1V
Yes
R117, R118, R119,
R120 >= 1V
Yes
Check U202
END
No
Resolder RFS101, C104, L123
No
No
Resolder F101, C107, L107
No
Resolder L125, L126, L106
No
No
Resolder R117, R118, R119,
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Check U101
pin2,pin4,pin8 = L
Yes
Check U102
pin 23,26,31 >=2.7V
Yes
R120
7-36
No
Check ANT Switch
control circuit
Resolder U101
No
Check & Resolder
U102, R107, R108
RF26MHz, RF PSU Part
Resolder U102
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