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Flow Chart of Troubleshooting
9-26
9-11. GSM Receiver
RX ON
RF input : CH center freq : +67.7kHz
Cell Power : -60dBm
Yes
No
F100 Pin8
≥ -65dBm
Resolder RFS100,C101,L107
Check F100
pin12,pin10 = L
Yes
Check ANT Switch
control circuit
Resolder F100
Check & Resolder
C118,C121,C123,R105
And PMU Part
Resolder U101
F100 1,2
≥ -68dBm
No
No
Yes
Yes
No
Resolder L100, L101, L103
L100 ≥ -70dBm
L103 ≥ -70dBm
Yes
No
oU101pin 16,17,29
32,36 ≥2.8V
pin10≥1.8V
U101 pin C2, B1,
B2, A1 ≥ 0.2Vp_p
No
Yes
Yes
Check UCP200
END