Dcs Receiver - Samsung SGH-E840 Service Manual

Flow Chart of Troubleshooting

3-2-3. DCS Receiver

CONTINUOS RX ON
RF INPUT : 698CH
Cell power : -50dBm
NORMAL CONDITION
c atch the channel?
YES
F100 CHECK
pin6 ≥ -65dBm?
YES
F100 CHECK
pin14,15 ≥ -
65dBm?
U104 CHECK
pin6,7 ≥ -65dBm?
YES
the power source
of U104
YES
U104 CHECK
Pin15,17 :13MHz
YES
GSM Receiver is ok?
END
NO
NO
resolder or change
NO
resolder or change
YES
NO
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
F100
4
L107, L108
5
6
change
3-22