Gsm850/Gsm900 Tx Troubles - Samsung GT-I8150 Service Manual

Level 3 Repair
8-3-19. GSM850/GSM900 TX
NORMAL CONDITION
Check L121 > 30 dBm ?
Check the Power
FEM100 Pin8
> 30dBm ?
Check L102 ≥
Check the Voltage
C102 = VBAT ?
Check the freq. at
OSC500 : 19.2MHz ?
GSM850/900 Transmitter is O.K?
NO
YES
NO
NO
YES
NO
30dBm ?
YES
NO
YES
NO
YES
NO
YES
END
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CHECK soldered
RFS100, L121,L101,C107,C159
resolder or change
FEM100
resolder or change
L102,L134,PAM100,C114
resolder or change
C102
change or resolder
OSC500
resolder or change
U300
8-48
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