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Flow Chart of Troubleshooting
9-22
9-12. GSM Receiver
1)Master
Check ANT Switch
control circuit
Resolder F101
Check & Resolder
C126,C130,C132
And PMU Part
Resolder U104
RX ON
RF input : CH center freq : +67.7kHz
Cell Power : -60dBm
Yes
F101 pin13
≥ -65dBm
No
Resolder RFS100,C113,L154
Yes
F101 pin1,2
≥ -68dBm
Check F101 pin9,12
= L
No
No
Yes
Yes
No
Resolder C117, C119 L110
U104
pin24,25 ≥ -70dBm
Yes
No
U104pin11,12,17,32
33 ≥2.8V
pin10≥1.8V
U104 pin 4,5,6,7
≥ 0.2Vp_p
No
Yes
Yes
Check UCP200
END