Samsung GT-P6800 Servise Manual page 93

Level 3 Repair
8-3-25. DCS/PCS TX
U101 PIN14 : About
27dBm ?
Check the Voltage at
C109 = V_BAT ?
Check L110, C115, C120
: About 30dBm ?
Check the Voltage at
C125 =V_BAT ?
Check C144: About
Check the voltage at
{C152 = VBAT_RF ?}
& {C159,C161 = V_BAT?}
& {C151, C167 = 2.85V ?}
& {C147, C164 = 2.65V ?}
& {C150, C169 = 1.8V?}
& {C149, C165, C168) = 1.2V?}
Check the freq. at C132
: 26MHz ?
DCS / PCS Transmitter is O.K?
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NO
YES
YES
NO
YES
YES
0dBm ?
YES
YES
YES
END
CHECK soldered
YES
- RFS100, C111, L105
C104, C102, C105, C103,
ANT100
NO
Resolder or change
U101, C109
Resolder or change
L110, C115, C120
NO
Resolder or change
U103, C125
Resolder or change
C144
NO
Resolder or change
U104
NO
Change or resolder
OSC100
NO
Resolder or change
UCP300
8-62
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