LG KG280 Service Manual - Page 48

TEST POINT, CIRCUIT, Waveform

Page 48 highlights

4. TROUBLE SHOOTING (2) Checking Mobile SW & FEM TEST POINT SSWW560000..AANNT SW600 SW600.RF VC_GSMV8C5_0E/EGGSSMM((VVCC21)) VVCC__DDCCSSP/PCCSS((VVCC12) C630 C6C36141 FL500 Figure 8 FLF6L0600.10.10 (C6(3C56) 35) FLF6L0600.50.12 (C6(2C46) 24) CIRCUIT TP600 TP601 TP602 R604 0 R625 0 C649 5.6p R609 0 R603 NA R606 NA R610 NA SW600 RF500 ANT ENWY0004501 G2 G1 RF C615 22p ANT_SW2 ANT_SW1 R616 R617 100ohm 100ohm FL600 20 GND7 19 GND6 GND5 18 GND4 16 13 GND3 11 GND2 GND1 9 15 VC2 VC1 14 LSHS-M085FJ GSM850_900_TX 12 GSM1800_1900_TX 10 GSM1900_RX_OUT2 GSM1900_RX_OUT1 8 7 GSM1800_RX_OUT2 GSM1800_RX_OUT1 6 GSM900_RX_OUT2 5 4 GSM900_RX_OUT1 3 GSM850_RX_OUT2 GSM850_RX_OUT1 2 1 ANT 17 C630 C631 39p 39p Waveform ANT_SW1(VC_GSM850/EGSM) Graph 5(a) GSM850/EGSM Tx mode ANT_SW1(VC_GSM850/EGSM) Graph 5(b) DCS,PCS Tx mode Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes - 49 - LGE Internal Use Only

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LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 49 -
(2) Checking Mobile SW & FEM
SW600.RF
FL500
SW600
C630
Graph 5(b) DCS,PCS Tx mode
Graph 5(a) GSM850/EGSM Tx mode
TEST POINT
CIRCUIT
Waveform
R617
100ohm
R604
0
TP602
GND6
19
GND7
20
10
GSM1800_1900_TX
5
GSM1800_RX_OUT1
6
GSM1800_RX_OUT2
GSM1900_RX_OUT1
7
8
GSM1900_RX_OUT2
GSM850_900_TX
12
GSM850_RX_OUT1
1
2
GSM850_RX_OUT2
GSM900_RX_OUT1
3
GSM900_RX_OUT2
4
VC1
14
VC2
15
LSHS-M085FJ
FL600
17
ANT
GND1
9
GND2
11
13
GND3
GND4
16
18
GND5
NA
R606
TP601
C630
39p
R603
NA
TP600
R609
0
39p
C631
C649
5.6p
100ohm
R616
22p
C615
R610
NA
SW600
RF500
ENWY0004501
ANT
G1
G2
RF
R625
0
ANT_SW2
ANT_SW1
Figure 8
SW600.ANT
C631
FL600.1
(C635)
FL600.5
(C624)
VC_GSM850/EGSM(VC1)
VC_DCS/PCS(VC2)
ANT_SW1(VC_GSM850/EGSM)
ANT_SW1(VC_GSM850/EGSM)