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Flow Chart of Troubleshooting
9-34
9-19. WCDMA Receiver
Rx On
RF Input: 10700 CH
Cell Power:-40dBm
RFS400( RF Connector)
C406
≥-50dBm ?
NO
Resolder or Change
RFS100
F400(Front End Module )
Pin#19
≥-50dBm ?
Check or Resolder
L508, C527
YES
F502(Duplexer)
Pin #5 ≥-50dBm ?
Resolder L511 or Change
F502
U505(RFR6250 ULNA_IN)
Pin #18 ≥-65dBm ?
Resolder or Change
F400
Check Front End Module
Control Path & check NV data
NO
YES
U505
(RFR6250 ULNA_OUT)
Pin #14 ≥-65dBm ?
Resolder or Change
U505
YES
YES
YES
YES
YES
NO
NO
NO
NO
F400
C423=L C426=L C429=L
?
Rx On
RF Input: 10700 CH
Cell Power:-40dBm
RFS400( RF Connector)
C406
≥-50dBm ?
NO
Resolder or Change
RFS100
F400(Front End Module )
Pin#19
≥-50dBm ?
Check or Resolder
L508, C527
YES
F502(Duplexer)
Pin #5 ≥-50dBm ?
Resolder L511 or Change
F502
U505(RFR6250 ULNA_IN)
Pin #18 ≥-65dBm ?
Resolder or Change
F400
Check Front End Module
Control Path & check NV data
NO
YES
U505
(RFR6250 ULNA_OUT)
Pin #14 ≥-65dBm ?
Resolder or Change
U505
YES
YES
YES
YES
YES
NO
NO
NO
NO
F400
C423=L C426=L C429=L
?
Resolder or Change
U505(RFR6250)
U505 RX IQ signal
≥1V ?
VREG_TCXO, VREG_RFRX
Of U505
≒
2.85V ?
Check UCP100(MSM6250)
YES
Check& Resolder
L504
END
NO
NO
YES
F503(UMTS RX Saw Filter)
Pin #3,4 ≥-65dBm ?
U202(RFR6250 IMIXM,IMIXP)
Pin #8,9 ≥-65dBm ?
Check the path of
F503 & U505
NO
YES
YES
YES
NO
Resolder C541 or
Change F503
Resolder or Change
U505(RFR6250)
U505 RX IQ signal
≥1V ?
VREG_TCXO, VREG_RFRX
Of U505
≒
2.85V ?
Check UCP100(MSM6250)
YES
Check& Resolder
L504
END
NO
NO
YES
F503(UMTS RX Saw Filter)
Pin #3,4 ≥-65dBm ?
U202(RFR6250 IMIXM,IMIXP)
Pin #8,9 ≥-65dBm ?
Check the path of
F503 & U505
NO
YES
YES
YES
NO
Resolder C541 or
Change F503