LG KG920 - Page 79

(3) Checking Mobile SW & FEM
4. TROUBLE SHOOTING
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TEST POINT
CIRCUIT WAVEFORM
Figure 4-9.
Graph 4-3. GSM Tx mode
Figure 4-10.
SW501.ANT
SW501.RF
VC_DCSPCS
FL501
SW501
C528
C522
VC_EGSM
(GPO_11)
(GPO_9)
22p
R503
0
C516
L501
18nH
G1 G2
RF
TP502
KMS-507
SW501
ANT
TP501
C507
NA
R505
4.7p
C524
270p
TP503
C528
270p
GND9
20
PCS_RX1
14
15
PCS_RX2
3
VC_DCSPCS
9
VC_EGSM
13
DCS_RX2
EGSM_RX1
10
11
EGSM_RX2
EGSM_TX
8
GND1
2
21
GND10
GND11
22
23
GND12
GND13
24
GND2
4
6
GND3
7
GND4
GND5
16
17
GND6
GND7
18
19
GND8
HWXQ511
FL501
1
ANT
5
DCSPCS_TX
DCS_RX1
12
R517
0
0
R516
0
R504
ANT_SW1
ANT_SW2
Graph 4-4. DCS,PCS Tx mode