Gsm900 Receiver - Samsung SGH-P520 Service Manual

10-2. RF

10-2-1. GSM900 Receiver

CONTINUOS RX ON
RF INPUT : 62CH
Cell power : -50dBm
NORMAL CONDITION
c atch the channel?
YES
U100 CHECK
pin12 ≥ -65dBm?
YES
U100 CHECK
pin16 ≥ -65dBm?
YES
U101 CHECK
pin24,25 ≥ -65dBm?
YES
the power source
of U101
YES
U101 CHECK
Pin34,35 :26MHz
YES
GSM Receiver is ok?
END
10-25
NO CHECK
L105,C116,C118
NO
RFS100
resolder or change
NO U100
resolder or change
F100,C114,
NO
L105,C116,C118
resolder or change
NO
check UCP300
NO
check OSC100 and
change
NO
GSM RX path component
resolder or change
Flow Chart of Troubleshooting
1
2
3
4
5
6