Samsung GT-i9003 Service Manual page 81

Level 3 Repair
8-3-20. DCS/PCS TX
U102 PIN1 : About
30dBm ?
Check the Voltage at
C130,C131,C129,C134 =
V_BAT?
Check C127 about 2 V
Check U102 pin 14
about 4dBm
Check the voltage at
{C324,L300,L301 = V_BAT ?}
& {L103,C317,C318,C319=
1.8V?}
Check the freq. at C185
: 26MHz ?
GSM850/900 Transmitter is O.K?
END
NO
YES
NO
YES
NO
ok?
YES
NO
YES
NO
YES
NO
YES
NO
YES
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CHECK soldered
RFS100,C115,C104
C183, ANT102
resolder or change
U102,C130,C131,C129,C134
resolder or change
U105
resolder or change
U105
resolder or change
UCP300
change or resolder
OSC100
resolder or change
UCP300
8-52
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