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Flow Chart of Troubleshooting
9-20
9-12. GSM850 Receiver
Check ANT Switch
control circuit
Resolder F100
Check & Resolder
C117,L123,C126
And PMU Part
Resolder RFS102
RX ON
RF input : CH center freq : +67.7kHz
Cell Power : -60dBm
Yes
F100 Pin19
≥ -65dBm
No
Resolder RFS100, R100, L101,
L100, C101
Yes
F100 1,2
≥ -68dBm
Check F100
pin10,pin11 = L
No
No
Yes
Yes
No
Resolder L102, L103, L104
RFS102
pin 27 ≥ -70dBm
pin 26 ≥ -70dBm
Yes
No
RFS102
pin 16,17,29
32,36 ≥2.8V
RFS102 pin 4,5,6,7
≥ 0.2Vp_p
No
Yes
Yes
Check UCP201
END