Samsung GT-E2550 - Page 45

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Flow Chart of Troubleshooting
9-13
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RFS100 CHECK
Pin#
2
≥
-65
dBm
?
9-2.
RF
9-2-1.
GSM
900
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 ≥
-65
dBm
?
YES
NO
F10
1
CHECK
Pin#
4 ≥
-65
dBm
?
C116,F101
resolder or change
YES
NO
C118,C120,L102
resolder or change
U100 CHECK
Pin#
1
8,
17 ≥
-65
dBm
?
YES
OSC100
resolder or change
OSC100 CHECK
Pin#
1, #3 : 26
MHz
NO
C127,C128,C129
2.8V ?
R105, C136
2.9
V?
YES
C127,C128,C129,R105,C136
resolder or change
NO
YES
GSM
900
Receiver is OK?
NO
GSM
900
RX path component
s
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)