Gsm Receiver - Samsung SGH-U100 Service Manual

3-2. RF

3-2-1. GSM Receiver

CONTINUOS RX ON
RF INPUT : 62CH
Cell power : -50dBm
NORMAL CONDITION
c atch the channel?
F101 CHECK
pin6 ≥ -65dBm?
F101 CHECK
pin12,13 ≥ -
65dBm?
UCD101 CHECK
pin6,7 ≥ -65dBm?
the power source
of UCD101
UCD101 CHECK
Pin19,21 :13MHz
GSM Receiver is ok?
END
NO
YES
NO
resolder or change
YES
NO
resolder or change
YES
NO
L107, L108, C114
resolder or change
YES
NO
check battery contact
YES
NO
check OSC101 and
YES
NO
GSM RX path component
①
CHECK
C101
②
RFS101
③
F101
④
⑤
⑥
change
resolder or change
3-21
Flow Chart of Troubleshooting