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SAMSUNG Proprietary-Contents may change without notice
Flow Chart of Troubleshooting
9-13
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RFS100 CHECK
Pin#2
≥
-65dBm ?
9-2. RF
9-2-1. GSM900 RX
Continuous Rx on, Rx input=-60dBm, Channel=190
CHECK
ANT,C151,C100,C101,C102
contact ?
NORMAL CONDITION
catch the channel?
NO
YES
RFS100
resolder or change
NO
YES
C103,C104,PAM100
resolder or change
NO
PAM100 CHECK
Pin#
17
≥
-65dBm ?
YES
NO
F10
1
CHECK
Pin#
4
≥
-65dBm ?
C116,F101
resolder or change
YES
NO
C118,C120,L102
resolder or change
U100 CHECK
Pin#
1
8,
17
≥
-65dBm ?
YES
OSC100
resolder or change
OSC100 CHECK
Pin#1, #3 : 26MHz
NO
C127,C128,C129 2.8V ?
R105, C136 2.9V?
YES
C127,C128,C129,R105,C136
resolder or change
NO
YES
GSM900 Receiver is OK?
NO
GSM900 RX path components
resolder or change
END
(C103)
(C116)
(Insert Conduction RF cable)
(C118,C120)
*Refer to the
Line(GSM900 Rx path) in service schematic page1
(*Pad #1,3 is visible)