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SAMSUNG Proprietary-Contents may change without notice
Flow Chart of Troubleshooting
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9-37
9-13. GSM900 Receiver
RX ON
RF input : 62 CH
Amp : -50dBm
F100 Pin 2
>= -65dBm
Yes
Resolder RFS100, C110
No
Yes
Check ANT Switch
control circuit
Check F100
pin3 = L, pin4=L
pin5 = H, pin6 = L
F100 Pin14, 15
>= -68dBm
No
No
Resolder F100
Yes
Yes
U101
pin 48 >= -70dBm
pin 49 >= -70dBm
Resolder or change
L104,L107,L105
No
Yes
Check all voltage
sources of U101
Is it OK?
No
No
U101 pin 1,3,23
>= 1V
Check & Resolder
CP PMIC(U401)
Resolder U101
Yes
Yes
Check UCP300
END