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9-11. GSM850 Receiver
RX ON
RF input : 190 CH
Amp : -50dBm
Yes
F100 Pin 2
>= -65dBm
Yes
F100 Pin12, 13
>= -68dBm
Yes
U101
pin 50 >= -70dBm
pin 51 >= -70dBm
Yes
U101 pin 1,3,23
>= 1V
Yes
Check UCP300
END
No
Resolder RFS100, C110
No
No
No
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Check F100
pin3 = L, pin4=H
pin5 = H
Yes
Resolder or change
L102,L103,C116
Check all voltage
sources of U101
Is it OK?
Yes
9-33
Flow Chart of Troubleshooting
No
Check ANT Switch
control circuit
Resolder F100
No
Check & Resolder
CP PMIC(U401)
Resolder U101
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