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Flow Chart of Troubleshooting
12. GSM Receiver
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Yes
MODULE1 Pin7
>= -65dBm
Yes
U100 pin1,2
>= -68dBm
Yes
U100
pin E1 >= -70dBm
pin F1 >= -70dBm
Yes
U100 pin
H8,J8,H7,J7
>= 1V
Yes
Check U200
END
No
No
No
Resolder C105, C114, L105
No
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Resolder CN100, C102
Check MODULE1
pin9,pin10,pin12 = L
Yes
R110, C126, C129
>=2.7V
Yes
7-24
No
Check ANT Switch
control circuit
Resolder MODULE1
No
Check & Resolder
U100, R113
RF26MHz, RF PSU Part
Resolder U100
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