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Flow Chart of Troubleshooting
9-58
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9-2-8. Abnormal WCDMA1900 Rx Operation
RX ON
AMP = -50dBm
1. Check
FEM Ant
Resolder RFS100,
L103, C101
F100 PIN20
≥
-65dBm
YES
Check Antenna
Switch Control
2. Check
FEM output
PIN12=H
PIN13=L
PIN14=H
PIN15=L
NO
F100 PIN18
≥
-70dBm
YES
NO
Resolder or Change
3. Check
Duplexer Input
NO
YES
Resolder DUF100,
C145, L136
DUF100 PIN6
≥
-75dBm
YES
4. Check
Transceiver Input
NO
Resolder or change
C150, C159,
L117
RFT100 PIN32,33
≥
-75dBm
YES
NO
Check RFT100,
UCP300
END