Samsung GT-S8500 Service Manual page 63

8-3-21. WCDMA Band8 TX
F100 pin3:
NO
about 20
dBm?
YES
CN100,C118,L102
check & change
L110
about : 20 dBm
NO
L122
about : 20 dBm
NO
C106,C143 =
3.8~4.2V ?
YES
U101 pin 1 about :
-5dBm ?
NO
C149
about : -5dBm
NO
U302
{C314 = 2.2V ?}
& {C316 = 1.3V ?}
& {C360 = 2.3V ?}
& {C321 = 1.4V ?}
YES
Check the freq. at
C300 :19.2MHz ?
Soldering state of U302 is O.K?
END
NO
C120 :
2.85V?
YES
YES
YES
NO
YES
YES
NO
NO
YES
NO
YES
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TX POWER DAC:120 CODE APPLIED
U302
check & change
L121,L110,F100
change or resolder
F101
change or resolder
Check
DC bias
U101
change or resolder
C149,C150,F102
change or resolder
U302
resolder or change
U300
change or resolder
U302
resolder or change
8-34
Level 3 Repair
CONTINOUS TX ON CONDITION
CH : 3013
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB