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Flow Chart of Troubleshooting
7-11. GSM Receiver
RX ON
RF input : CH center freq
Amp : -50dBm
Yes
U100 Pin7
>= -65dBm
Yes
U100 pin5
>= -65dBm
Yes
F101 pin1
>= -70dBm
Yes
U101
pin32 >= -70dBm
pin33 >= -70dBm
Yes
U101 pin6, 7, 8, 9
>= 1V
Yes
R130,R131,R132
,R133 >= 1V
Yes
Check U202
END
No
No
No
Resolder F101, C107, L115
No
Resolder L112, L113, L114
No
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Resolder CN101, C102
Check U100
pin2=L,pin4=L,pin8=L
Yes
Check U101
pin10,22,28 >=2.7V
pin20 >=4.0V
Yes
7-22
No
Check ANT Switch
control circuit
Resolder U100
No
Check & Resolder
RF PSU Part
Check &Resolder
U101, RF26MHz part,
R104, R105
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