Samsung GT-S3370 Service Manual page 43

Flow Chart of Troubleshooting
9-2.RF
9-2-1. GSM850 RX
NO
NORMAL CONDITION
CHECK soldered
catch the channel?
ANT contact, C115, L 117, L120
YES
CONTINUOUS RX ON
NO
FEM100 CHECK
FEM100,RFS100
RF INPUT : 190CH
pin2 ≥ -65dBm ?
resolder or change
AMP : -50dBm
YES
NO
FEM100 CHECK
FEM100
pin12,13 ≥ -65dBm ?
resolder or change
YES
NO
FEM100
FEM100 CHECK
resolder or change
pin 7 : 2.9V ?
YES
NO
FEM100
UCP300
pin 12,13 Vp-p
resolder or change
: 120mV ?
YES
NO
GSM RX path component
resolder or change
GSM Receiver is O.K?
YES
END
9-15
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