LG KE800 Service Manual page 67

4. Trouble Shooting
4.19.5 Checking FEM & Mobile SW
SW501 KMS-505
G2
ANT RF
G1
ANT_SW1
ANT_SW2
ANT_SW3
Mobile SW & FEM Circuit Diagram
C501 100p
C508 C509 C510
1.8p 1.8p 2.7p
Figure 9. Mobile SW & FEM Circuit
Figure 10. Mobile SW & FEM
RX Mode EGSM
ANT_SW1 Off
ANT_SW2 On
ANT_SW3 Off
Table 2. FEM RX Control Logic
18
GMS_RX-
19
GSM_RX+
16
EGSM_RX-
17
EGSM_RX+
14
DCS_RX-
15
DCS_RX+
12
PCS_RX-
13
PCS_RX+
6
TX1G
8
TX2G
C511 C512 C513
2.7p 1.2p 1.2p
DCS PCS
Off Off
Off Off
On Off
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2V85_RF
C504
0.1u
FL501
YGHF-S006A
3
VDD
22
VCTRL1
21
VCTRL2
20
VCTRL3
2
GND1
4
GND2
5
GND3
7
GND4
9
GND5
10
GND6
SW501