LG KF350 Service Manual page 90

4.13.3 Checking Mobile SW & FEM
Mobile SW & FEM Circuit Diagram
VC1 (FE1) VC2 (FE2)
GSM850 / 900_TX H H
GSM 1800 / 1900_ TX L H
GSM850 / 900_RX H L
GSM 1800 / 1900_ RX L L
ANT400
WFL-R-SMT10
G1
SW400
G2
G3 ANT
TP1
Checking Points
FL401
FE1
FE2
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Only for training and service purposes
2V85_VRF
TP1
C400
1000p
C406
RF-800
LMSP43QA-538
100p
TP9
G2
ANT
ANT RF
11
G1
L406
C407
100nH
DNI
Figure 8. Mobile SW & FEM Circuit
TP5 ~ 8
TP4_R403 (FE2)
TP3_R402 (FE1)
Figure 9. Mobile SW & FEM
EGSM/GSM850
ON
OFF
Table 2. FEM RX Control Logic
4. TROUBLE SHOOTING
LMSP43QA-538(CMOS)
C401
100p
NC2
FL400
24
NC1
23
DCS/PCS
OFF
OFF
- 91 -
R402
TP4
100ohm
FE1
FE2
TP3
R403
100ohm
C402
100p
L404
6.8nH
C411
C410
0.5p
0.5p
SW401
TP2
TP1
LGE Internal Use Only