LG C3400 Service Manual page 52

(3) Checking Ant SW & Mobile SW
TEST POINT
CIRCUIT
ANT500
C500
1.2p
L509
3.3nH
L500
22nH
SW500
ENWY0002201
C508
22p
FL500
8
ANT
4
GND1
6 5
GND2 EGSM_TX
7 3
GND3 DCS_TX
9
GND4
12
GND5
13 10
GND6 EGSM_RX
14 1
GND7 DCS_RX
11 2
SHS-C090DR
L507
33nH
C531 10p
L508
33nH
C537 3.3p
C531 (VC2)
ANT501 ANT502
Figure 4-5
ANT_SW2
ANT_SW1
- 51 -
FL500. 10 FL500. 10
C537 (VC1)
VC1 VC1 VC1
VC2 VC2 VC2
ANT SW Control GSM& DCS RX Mode
Graph 4-3
Table 4-2
4. Troubleshooting
SW500. RF
FL500. 1
Waveform
Low Low Low
Low Low Low