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DVD VCR Combo
DVS7905
Page 2
LG DVS7905 - Page 2
145 pages
Manual
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CONTENTS
SECTION 1
. . . .
SUMMAR
Y
SECTION 2
. . . .
CABINET & MAIN CHASSIS
SECTION 3
. . . .
ELECTRICAL
SECTION 4
. . . .
MECHANISM OF VCR P
ART
SECTION 5
. . . .
MECHANISM OF DVD P
ART
SECTION 6
. . . .
REPLACEMENT P
ARTS LIST
1
3
Table of Contents
Main Page
Section 1 Summary
3
Product Safety Servicing Guidelines for Video Products
4
Servicing Precautions
5
Service Information for Eeprom IC Setting
6
Specifications
7
Section 3 Electrical
11
Table of Contents
11
Electrical Adjustment Procedures
13
Vcr Part
13
Electrical Troubleshooting Guide
14
Power(Smps) Circuit
14
System/Key Circuit
17
Servo Circuit
18
Y/C Circuit
21
Hi-Fi CIRCUIT
25
Tuner/If CIRCUIT
28
Block Diagrams
30
Power(Smps) BLOCK DIAGRAM
30
Tu/If, NICAM & A2 BLOCK DIAGRAM
31
Vps Block Diagram
31
Y/C Block Diagram
32
Hi-Fi BLOCK DIAGRAM
33
System Block Diagram
34
Circuit Diagrams
35
Power(Smps) CIRCUIT DIAGRAM
35
Tu/If, Nicam & A2 Circuit Diagram
36
A/V Circuit Diagram
37
Hi-Fi CIRCUIT DIAGRAM
38
Scart(Jack) Circuit Diagram
39
System Circuit Diagram
40
Timer Circuit Diagram
41
Waveform & Voltage Sheet
42
Circuit Voltage Chart
43
Main P.C.board
45
Printed Circuit Diagrams
45
Key P.C.board
46
Smps P.C.board
46
Timer P.C.board
46
DVD Part
48
Electrical Troubleshooting
48
System Operation Flow
48
Test & Debug Flow
49
Details and Waveforms on System Test and Debugging
55
SYSTEM 27Mhz CLOCK,RESET,FLASH R/W SIGNAL
55
Sdram Clock
57
Tray Open/Close Signal
57
Lens Control Related Signal(no Disc Condition)
59
Sled Control Related Signal (no Disc Condition)
59
Disc Type Judgement Waveform
60
Laser Power Control Related Signal(no Disc Condition)
60
Focus on Waveform
62
Spindle Control Waveform (no Disc Condition)
63
Tracking Control Related Signal(System Checking)
64
Mt1379 Audio Optical and Coaxial Output (Aspdif)
65
Rf Waveform
65
Mt1379 Video Output Waveform
66
Audio Output from Audio Dac
67
Block Diagrams
69
Overall Block Diagram
69
Servo Block Diagram
70
Mpeg & Memory Block Diagram
71
Video & Audio Block Diagram
72
Circuit Diagrams
74
System Circuit Diagram
74
Rf & Dsp Servo Circuit Diagram
75
Audio Circuit Diagram
76
Av/Jack Circuit Diagram
77
Circuit Voltage Chart
78
Main P.C.board
80
Printed Circuit Diagrams
80
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