Samsung i780 Service Manual page 83

Flow Chart of Troubleshooting
9-12. DCS Receiver
RX ON
Sector PWR = -50dBm
YES
F100 pin 11 >=
- 60 dBm
YES
F100 pin 19,20 >=
- 70 dBm
YES
U100 pin 38,39 >=
- 75 dBm
YES
Check U100
& UCP200
NO
NO
NO
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Resolder RFS100,
L100, L101, C103, C109
NO
Check F100 truthtable
Pin 5,6 : LOW
Pin 4 : HIGH
YES
Resolder or Change
L103, L104, L105, C118
9-36
Check R103, R105,
R109, UCP200
Resolder or Change
F100