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Flow Chart of Troubleshooting
9-20
9-12. GSM Receiver
RX ON
RF input : CH center freq : +67.7kHz
Cell Power : -60 dBm
Yes
Resolder RFS100, C102, R121,
L101
No
F101 Pin13
≥ -65dBm
Yes
No
Check F101
pin9=L, pin11=L
F101 pin1,2
≥ -65dBm
Check ANT Switch
control circuit
No
Resolder F101
Yes
Yes
U101
pin21 ≥ -70dBm
pin22 ≥ -70dBm
No
Resolder L106, C114, C119
Yes
Check U101
pin12,13,29,29 ≥
2.8V
pin11 ≥ 1.8V
U101 pin 4, 5, 6, 7
≥ 0.2Vp_p
No
Check & Resolder
PMU Part
No
Check &Resolder
U101, OSC100
Yes
Yes
Check UCP200
END