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Level 3 Repair
8-54
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8-3-21. WCDMA BAND1 TX
Check the voltage at
{R106 = VBAT ?}
& {C158, U305 = 2.85V ?}
& {C159,C160,C325 = 1.8V?}
& {C330 = 2.85V ?}
Check the Voltage at
C131 = VBAT ?
Check U104 pin 9
about 22dBm ?
Check U104 PIN2
about 8dBm ?
CHECK soldered
RFS100, L102,C115,C104,
C183, ANT102
resolder or change
U102 , C131
resolder or change
U104
resolder or change
U105
Check the freq. at C185
: 26MHz ?
change or resolder
OSC100
Check C163, L107 :
About 22dBm ?
resolder or change
C163, L107
WCDMA 2100 Transmitter is O.K?
resolder or change
UCP300
END
NO
YES
NO
YES
NO
YES
NO
NO
NO
YES
NO
YES
Check C166, C168, L113,
F106_PIN3 About 22 dBm ?
resolder or change
C166, C168, L113, F106
NO
Check C165, F105 about
8dBm ?
resolder or change
C165, F105
NO
Check the Voltage at
C125 = VBAT ?
C188
≥
2.95V ?
resolder or change
U101 , U108
NO
YES
NO
YES
NO
YES
NO
NO
YES