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4. TROUBLE SHOOTING
GS290 Operational Description Revision B
LG Electronics
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LGE Property
4.12.3 Checking Mobile SW & FEM
EGSM/GSM850
DCS/PCS
VC1
OFF
OFF
VC2
OFF
OFF
SW500
FL500
TP1
G
TP2
G
TP5 ~ 8
G
TP3_C508 (VC2)
G
Mobile SW & FEM Circuit Diagram
Figure 8. Mobile SW & FEM Circuit
Checking Points
Figure 9. Mobile SW & FEM
Table 2. FEM RX Control Logic
TP4
TP3
TP1
TP2
TP4_C503 (VC1)
G
22p
C524
KMS-518_P
SW500
G1
A
C
G2
100n
L501
C539
DNI
100
R502
100
R504
C503
47p
C508
47p
LMSP43NA-782
FL500
0
2
9
1
3
1
1
1
8
1
5
1
8
4
1
7
2
1
6
9
5
4
0
1
3
6
1
2
1
17
ANT
1
X
R0
58
M
S
G
2
X
R0
58
M
S
G
1
C
V
1
X
R0
09
M
S
G
2
C
V
2
X
R0
09
M
S
G
1
X
R0
08
1
M
S
G
1
D
N
G
2
X
R0
08
1
M
S
G
2
D
N
G
1
X
R0
09
1
M
S
G
3
D
N
G
2
X
R0
09
1
M
S
G
4
D
N
G
5
D
N
G
XT
00
91
_0
08
1
M
S
G
XT
00
9_
05
8
M
S
G
1
C
N
2
C
N
VC1
VC2
TP1
TP2
TP4
TP