Samsung GT-P5100 Service Manual page 71

Level 3 Repair
8-3-20. GSM1800/ GSM1900 TX
U101 PIN14 : About
30dBm ?
Check the Voltage at
C103 = VOUT_CHARGER?
Check C126:
About 27dBm ?
Check the Voltage at
C131 = OUT_CHARGER?
Check C144:
About 0dBm ?
Check the voltage at
{C150 = VBAT_RF ?}
& {C149 = 2.85V ?}
& {C145 = 2.65V ?}
& {C151 = 1.8V?}
& {C152 = 1.2V?}
Check the freq. at C139
: 26MHz ?
GSM1800/1900 Transmitter is O.K?
END
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YES
NO
NO
YES
YES
NO
NO
YES
YES
YES
NO
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YES
NO
CHECK soldered
C121, L108, RFS100
Resolder or change
U101, C103
Resolder or change
C126
Resolder or change
U103, C131
Resolder or change
C144
Resolder or change
U104
Change or resolder
OSC100
Resolder or change
UCP300
8-52
CONTINOUS TX ON CONDITION
TX POWER DAC:14500 CODE
APPLIED
DCS CH : 685
PCS CH : 661
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB