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Flow Chart of Troubleshooting
10-30
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10-10. GSM900 Receiver
RX ON
Sector PWR=50dBm
Resolder or change F101
,L104, L105, C136
Change U100 & UCP200
PAM100 Pin8
>= -60dBm
Check PAM100
Truth Table
Pin 1 : HIGH
Pin 27 : HIGH
Pin 28 : HIGH
No
Yes
Resolder RFS100, C103, R100
,L100 ,L101, C111
Resolder or change PAM100
No
F100 Pin 5
>= -70dBm
Yes
U100 Pin 48,49
>= -75dBm
No
Yes
Yes