LG GX500 Service Manual page 96

GX500 Operational Description
4.12.3 Checking Mobile SW & FEM
TP2
TP1
TP1
Figure 4-37 Mobile SW & FEM Circuit
Figure 4-37 Mobile SW & FEM Circuit
SIM1
Figure 4-38. Mobile SW & FEM
SIM1
Figure 4-38. Mobile SW & FEM
Table 4-2. FEM RX Control Logic
EGSM/GSM850
FE1 OFF
FE2 OFF
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LG Electronics
ANT
1
SIM1 Circuit
C641
0.75p
SIM1 Circuit
TP2
TP1 TP2
TP2
TP1
5p L 611
SIM2 Circuit
C632
C641
18n
0.75p
SIM2 Circuit
TP3
Figure 4-37 Mobile SW & FEM Circuit
TP4
TP3
TP2
TP4
TP2
TP1
TP5~8
TP1
TP5~8
SIM1
Figure 4-38. Mobile SW & FEM
DCS/PCS
ON
Table 4-2. FEM RX Control Logic
Table 4-2. FEM RX Control Logic
OFF
EGSM/GSM850
EGSM/GSM850
FE1 OFF
FE1 OFF
97/143
FE2 OFF
FE2 OFF
97/143
SW602
2
COMMON ANT
17
G3 G4
4 3 100NH
L601
TP3 TP4
SIM1 Circult
SIM1 Circuit
TP3
VC1 (FE1) VC2 (FE2)
GSM850 / 900_TX H L
GSM 1800 / 1900_ TX L H
GSM850 / 900_RX L L
GSM 1800 / 1900_ RX L L
SW602
2
ANT COMMON
1 17
G3 G4
4 3
100NH
L601
SIM2 Circult
SIM2 Circuit
TP3
TP4
TP2
SIM2
TP1
TP5~8
SIM2
DCS/PCS
DCS/PCS
ON
ON
LGE Property
OFF
OFF - 97 -
97/143
4. TROUBLE SHOOTING
Revision A
Revision A
VC1
VC2
C637 C636
47P 47P
TP TP4
TP3 TP4
TP4
VC1
VC2
C637 C636
47P 47P
ANT
SIM2
LGE Property
LGE Property
Revision A
LGE Internal Use Only