LG KG245 Service Manual page 51

4. TROUBLE SHOOTING
(3) Checking Mobile SW & FEM
TEST POINT
CIRCUIT
ANT400 ANT401 ANT402
1p
C407
L407
5.6nH
NA
L400
SW400
KMS-506
C417
22p
GND13 PCS_RX2
24 15
GND12 PCS_RX1
23 14
GND11 DCS_RX2
22 13
GND10 DCS_RX1
21 12
GND9 EGSM_RX2
20 11
GND8 EGSM_RX1
19 10
GND7
18
GND6
17
GND5
16
GND4
7
GND3 DCSPCS_TX
6 5
GND2 EGSM_TX
4 8
GND1
2
FL400
HWXQ511
C439 C440
270p 270p
Figure 4-4 (b). Mobile SW & FEM Circuit
SW400
SW400.ANT
VC_DCSPCS
VC_EGSM
Figure 4-4(a) Mobile SW & FEM Circuit
C410
NA
C418
NA
ANT_SW1 (GPIO_9)
(GPIO_11)
ANT_SW2
FL400
WAVEFORM
FL301. 10
VC_DCSPCS VC1
VC_EGSM
VC2
ANT SW Control GSM& DCS RX Mode
Graph 2
ANT_SW1
GSM_TX
DCS_TX
RX
- 52 -
SW400.RF
Low Low Low
Low Low Low
ANT_SW2
High Low
Low High
Low Low
Table 1