Samsung Wave GT-S8500, Service Manual, Page: 59 / 68

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Level 3 Repair
8-30
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8-3-
18
. GSM850/900 TX
F100 pin3:
about 30
dBm?
CN100,C118,
L102
check &
change
C120 :
2.85V?
U302
check & change
C104
about : 30 dBm
NO NO
YES
YES
YES F100
change or resolder
C105=3.8~4.2V ?
C103 = about -
5dBm ?
YES
C196= about -5dBm
?
NO
Check
DC bias
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
NO
U100
change or resolder
NO
U302
resolder or change
Check the freq. at
C300 :19.2MHz ?
U300
change or resolder
YES
YES
YES
Soldering state of U302 is O.K?
U302
resolder or change
END
U302
{C314 = 2.2V ?}
& {C316 = 1.3V ?}
& {C360 = 2.3V ?}
& {C321 = 1.4V ?}
NO
YES
YES
NO
NO
NO
C196,C100,C102,
C101,C103
change or resolder