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Level 3 Repair
8-58
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Check U102 PIN1 :
About 22 dBm ?
8-3-23. WCDMA BAND8 TX
CONTINOUS TX ON CONDITION
TX POWER DAC:14500 CODE
APPLIED
GSM850 CH : 190
GSM900 CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
Check the Voltage at
C131 = VBAT ?
Check U106 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
U106
resolder or change
U105
Check the freq. at C185
: 26MHz ?
change or resolder
OSC100
Check L108, L109 :
About 22dBm ?
resolder or change
L108, L109
WCDMA 900 Transmitter is O.K?
resolder or change
UCP300
END
NO
YES
NO
YES
NO
YES
NO
NO
NO
YES
NO
YES
Check C174, C177, C178,
F107_PIN3 About 22 dBm ?
resolder or change
C174, C177, C178, F107
NO
Check C175, F108 about
8dBm ?
resolder or change
C175, F108
NO
Check the Voltage at
C125 = VBAT ?
C188
≥
2.95V ?
resolder or change
U101 , U108
NO
YES
NO
YES
NO
YES
NO
NO
YES
Check the voltage at
{R106 = VBAT ?}
& {C158, U305 = 2.85V ?}
& {C159,C160,C325 = 1.8V?}
& {C330 = 2.85V ?}