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FlowChartofTroubleshooting
7-36
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7-10. GSM Receiver
U101 Pin7
>= -65dBm
Resolder RFS101, C104, L123
END
No
Yes
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Check U101
pin2,pin4,pin8 = L
U101 pin5
>= -65dBm
F101 pin1
>= -67dBm
U102pin7,8,9,10
>= 1V
U102
pin29 >= -70dBm
pin30 >= -70dBm
Check ANT Switch
control circuit
Resolder U101
Resolder F101, C107, L107
Resolder L125, L126, L106
Check U102
pin 23,26,31 >=2.7V
Check & Resolder
U102, R107, R108
RF26MHz, RF PSU Part
Resolder U102
R117, R118, R119,
R120 >= 1V
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Check U202
Resolder R117, R118, R119,
R120
No