LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 104 -
4.6.1 Checking VCO Block
NO OSCILLATION
HIGH
(1%)
(1%)
DCS1800/PCS1900
HIGH
(1%)
TX VCO CONTROL LOGIC
GSM850/900
HIGH
HIGH
LOW
TP5
LOW
TP4
C537
120p
15p
C556
15p
C557
R517
100ohm
330p
VBATT
C535
VREG_RFTX_2.85V
R523
FB502
270
100p
C547
R524
51
0.1uF
C555
39
VDDA11
VDDA12
41
43
VDD_M
40
TX_MOD_
TX_VCO_F
42
38
GSM900_I
_
37
VREG_MSMP_2.7V
R521
220
R519
100ohm
C554
33p
0
R508
R507 100
VC
10
GND1
2
GND2
4
GND3
6
7
GND4
GND5
8
GND6
12
13
GND7
GND8
14
5
OUT_DCSPCS
1
OUT_GSM
9
SW1
11
SW2
3
VB
MQW5V0C869M
U502
0
R513
C553
tcc_1608h_9_r
4.7u
R510
100
C546
1000p
15
R518
15
R516
0.01u
C545
220
R520
100ohm
R514
C541
82p
270
R522
C539
5.6n
ECHU1C562JX5
22u
C543
GSM_PA_RAMP
GSM_TX_VCO_0_EN_N
GSM_TX_VCO_1_EN_N
TX_ON
TP2
TP1
TP3
TP5
TP4
Содержание KS10
Страница 1: ...Date July 2007 Issue 1 0 Service Manual Model KS10 Service Manual KS10 Internal Use Only ...
Страница 207: ... 208 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 214: ... 215 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 216: ... 217 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 217: ... 218 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 246: ...Note ...
Страница 247: ...Note ...