Samsung SGH-U600 Service Manual page 34

3-2. RF
3-2-1. GSM850 Receiver
CONTINUOS RX ON
RF INPUT : 190CH
Cell power : -50dBm
NORMAL CONDITION
c atch the channel?
YES
F101 CHECK
pin6 ≥ -65dBm?
YES
F101 CHECK
pin18,19 ≥ -
U100 CHECK
pin2,3 ≥ -65dBm?
YES
the power source
of U100
YES
U100 CHECK
Pin15,17 :13MHz
YES
GSM Receiver is ok?
END
NO
NO
resolder or change
NO
resolder or change
YES
NO
L103, L104, C111
resolder or change
NO
check battery contact
NO
check OSC100 and
NO
GSM RX path component
resolder or change
1
CHECK
C100
2
RFS100
3
F101
4
5
6
change
3-19
Flow Chart of Troubleshooting