Gsm850/Gsm900 Tx - Samsung GT-I9500 Service Manual

Level 3 Repair

8-3-14. GSM850/GSM900 TX

F100 PIN 4 :
About 30dBm ?
Check F100 PIN 6
About 30dBm
Check the Voltage at
C166 = VBATT ?
Check component
soldering status OK at
F101
Check F101 PIN 9
About 30dBm ?
Check U102 PIN 4
About 30dBm ?
Check U102 PIN 26
About 10dBm?
Check the freq. at
OSC100 PIN 4 : 26MHz ?
Check component
soldering status ok at
U103
GSM850/900 Transmitter is O.K?
END
YES
NO
YES
NO
NO
YES
NO
YES
YES
NO
YES
NO
YES
NO
NO
YES
NO
YES
NO
CHECK soldered
- RFS100, L111, C136
Resolder or change
F100
Resolder or change
C166, L119
Resolder or change
F101
Resolder or change
F101
Resolder or change
L117, C153
Resolder or change
U102
Change or resolder
OSC100
Resolder or change
U103
Resolder or change
U300
8-27
CONTINUOUS TX ON CONDITION
TX POWER IDX1 APPLIED
GSM850 CH : 190
GSM900 CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB