Samsung GT-S3370 Service Manual page 45

9-2-2. EGSM RX
NORMAL CONDITION
catch the channel?
pin2 ≥ -65dBm ?
pin22 ≥ -65dBm ?
GSM Receiver is O.K?
YES
FEM100 CHECK
YES
FEM100 CHECK
YES
FEM100 CHECK
pin 7 : 2.9V ?
YES
FEM100
pin 22 Vp-p
: 120mV ?
YES
NO
YES
END
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NO
CHECK soldered
ANT contact, C115, L 117, L120
NO
FEM100,RFS100
resolder or change
NO
FEM100
resolder or change
NO
FEM100, UCP300
resolder or change
NO
UCP300
resolder or change
GSM RX path component
resolder or change
9-17
Flow Chart of Troubleshooting