Samsung GT-S3370 Service Manual page 53

9-2-6. GSM850/ GSM900 TX
FEM100 pin11:
about 2~3 dBm?
YES
RFS100,C115,L117,L120
check&change
PAM100
pin4 : 3.7~4.2 V?
PAM100
pin 5 : 1.2V ?
NO
PAM100 pin8
about : -5dBm ?
PAM100
pin 3 : 2.8V?
PAM100
change or resolder
UCP300
change oresolder
NO
FEM100
pin7 : 2.85 V?
YES
NO
BATTERY ,UCP300
check & change
YES
NO
Check R119
YES
YES
NO
YES
UCP300
check
NO
C432 : 2.85V ?
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NO
FEM100
check & change
9-25
Flow Chart of Troubleshooting
CONTINOUS TX ON CONDITION
TX POWER DAC: 600 CODE APPLIED
CH : 190/37
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB