Samsung GT-P6800 Servise Manual page 91

Level 3 Repair
8-3-24. GSM850/GSM900 TX
U101 PIN14 : About
30dBm ?
Check the Voltage at
C109 = V_BAT?
Check L109, C114, C119
: About 30dBm ?
Check the Voltage at
C125 =V_BAT ?
Check C143: About
0dBm ?
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 ?
GSM850/900 Transmitter is O.K?
Confidential and proprietary-the contents in this service guide subject to change without prior notice.
Distribution, transmission, or infringement of any content or data from this document without Samsung's written authorization is strictly prohibited.
YES
NO
NO
YES
YES
NO
NO
YES
YES
NO
YES
NO
YES
NO
END
CHECK soldered
- RFS100, C111, L105
C104, C102, C105, C103,
ANT100
Resolder or change
U101, C109
Resolder or change
L109, C114, C119
Resolder or change
U103, C125
Resolder or change
C143
NO
Resolder or change
U104
Change or resolder
OSC100
Resolder or change
UCP300
8-60
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