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Flow Chart of Troubleshooting
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10-35
10-12. GSM Receiver
RX ON
Cell Power : -60dBm
F100 Pin13
≥
-65dBm
Yes
Resolder RFS100, C113, L102
No
Yes
No
Check F100
pin9,pin11 = L
F100 1,2
≥
-68dBm
Check ANT Switch
control circuit
No
Yes
Resolder F100
Yes
U107
pin 24
≥
-70dBm
pin 25
≥
-70dBm
Resolder C119, C120, U104
No
Yes
U107pin 11,12,16,29,
32,33,36
≥
2.8V
No
U107 pin 4,5,6,7
≥
0.2Vp_p
No
Check & Resolder
C128,C134,C137
Yes
Yes
Resolder U107
Check UCP200
END