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Flow Chart of Troubleshooting
9-46
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9-14. WCDMA 2100 Receiver
RX ON
Sector Power = -50dBm
U100 pin11
>=-65dBm
Resolder RFS100,
C104,L100,R100, C105
U100 pin9
>=-70 dBm
No
Yes
No
Check
U100 truth
table
Check
R106,R109,
R118,UCP200
No
Resolder or
Change U100
Resolder or Change
DUF100, L126,C171
Yes
No
Yes
Check U101 & UCP200
Check
C148, C153, L113, L116
F102, L114, C152, L115
END
DUF100 pin2
>=-75 dBm
Yes
No
No
U101 pin26
>=-75 dBm
Yes
U101 pin29
>=-75 dBm
Yes
U101 pin34,35
>-75dBm
Yes
Resolder or Change
C174, L128
No
Resolder or Change
U101
Pin#6: High
Pin#5: Low
Pin#4: High