Only For Training And Service Purposes - LG KG280 Service Manual

4. TROUBLE SHOOTING
(2) Checking FEM & Mobile SW
TEST POINT
VC_EGSM(VC2)
VC_GSM850/EGSM(VC1)
VC_DCSPCS(VC1)
VC_DCS/PCS(VC2)
CIRCUIT
TP600 TP601 TP602
R604 R625
R603
0 0
NA
C649
5.6p
R606
NA
R609
0
R610
NA
SW600
ENWY0004501
RF500
C615
22p
R616 100ohm
ANT_SW2
R617 100ohm
ANT_SW1
C630
LGE Internal Use Only
SW600.ANT
SW500.ANT
SW600
SW600.RF
FL600 LSHS-M085FJ
GND7 GSM850_900_TX
20
GND6 GSM1800_1900_TX
19
GND5
18
GND4 GSM1900_RX_OUT2
16
GND3 GSM1900_RX_OUT1
13
GND2 GSM1800_RX_OUT2
11
GND1 GSM1800_RX_OUT1
9
GSM900_RX_OUT2
GSM900_RX_OUT1
VC2 GSM850_RX_OUT2
15
VC1 GSM850_RX_OUT1
14
C631
39p 39p
C630
C641
C631
FL600
FL600.10
FL600.1
(C635)
(C635)
FL600.5
FL600.12
(C624)
(C624)
FL301. 10
ANT_SW2 DCS/PCS VC_DCSPCS VC1
VC_EGSM
ANT_SW1 GSM850/EGSM
VC2
ANT SW Control GSM850/EGSM &
DCS/PCS RX Mode
12
10
8
7
6
5
4
GSM850/EGSM_TX
3
2
1
DCS/PCS_TX
GSM_RX
DCS_RX
PCS_RX
Copyright © 2007 LG Electronics. Inc. All right reserved.
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WAVEFORM
Graph 2
ANT_SW1 ANT_SW2
HIGH LOW
LOW HIGH
LOW LOW
LOW LOW
LOW LOW
Table 4-1

Only for training and service purposes

Low Low Low
Low Low Low