LG KF350 Service Manual page 100

4.14.6. Checking FEM & Mobile SW
VC1 (FE1) VC2 (FE2)
GSM850 / 900_TX H
GSM 1800 / 1900_ TX L
GSM850 / 900_RX H
GSM 1800 / 1900_ RX L
ANT400
WFL-R-SMT10
G1
G2
G3 ANT
TP6
Checking Points
FL401
FE1
FE2
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Only for training and service purposes
H
2V85_VRF
H
L
L
C400
1000p
TP5
C406
SW400 RF-800
100p
G2
ANT
ANT RF
11
G1
L406
C407
100nH
DNI
TP5,6,7,8
Figure 28. Mobile SW & FEM Circuit
TP4_R403 (FE2)
TP3_R402 (FE1)
TP5
Figure 29 Mobile SW & FEM
EGSM/GSM850
ON
ON
Table 5. FEM TX Control Logic
4. TROUBLE SHOOTING
LMSP43QA-538(CMOS)
TP1 TP4
TP2 TP3
C401
100p
NC2
FL400
24
NC1
LMSP43QA-538 23
DCS/PCS
OFF
ON
- 101 -
R402
100ohm
FE1
FE2
R403
100ohm
C402
100p
L404
6.8nH
C411
C410
0.5p
0.5p
SW401
TP2
TP1
LGE Internal Use Only