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LG GC480W Service Manual
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SER
VICE MANUAL
VIDEO CASSETTE
RECORDER
SER
VICE MANUAL
MODELS : GC260W/GC480W/GC990W
(GC260W1/GC480W1/GC990W1)
CAUTION
BEFORE SER
VICING THE UNIT
, READ
THE “SAFETY
PRECAUTIONS”
IN THIS MANUAL.
GC260W
GC480W
GC990W
PLAY
MODELS : GC260W/GC480W/GC990W(GC260W1/GC480W1/GC990W1)
SERVICE MANUAL
P/NO : 3829RVP048E
MARCH, 2004
2
Table of Contents
Table of Contents
3
Video Cassette
1
Key to Abbreviations
4
Product Safety Servicing Guidelines for Video Products
5
Servicing Precautions
6
Protection
7
Service Notice on Replacing Eeprom
8
IC Setting
9
Specifications
10
Service Method
11
Electrical Part
11
Exploded Views
12
Cabinet & Main Frame Section
12
Packing Accessory Section
13
Electrical Adjustment Points Arrangement
14
Electrical Adjustment Procedures
15
Electrical Troubleshooting Guide
17
Power Circuit(SMPS)
17
Servo Circuit
20
System & Front Panel Circuit
23
Y/C Circuit
26
Tuner/If Circuit
30
Hi-Fi Circuit
33
Block Diagrams
35
Power Block Diagram
35
Y/C Block Diagram
37
Hi-Fi Block Diagram
37
System Block Diagram
38
Circuit Diagrams
39
Power Circuit Diagram
39
Tuner, NICAM, A2 Circuit Diagram
40
A/V Circuit Diagram
41
System Circuit Diagram
42
Hi-Fi Circuit Diagram
43
Waveform
44
Circuit Voltage Chart
45
Printed Circuit Board Diagrams
47
MAIN P.C.board (TOP VIEW)
47
MAIN P.C.board (BOTTOM VIEW)
48
KEY (LEFT) P.C.board
49
Section 4 Mechanism (D-37)
51
Default Chapter
51
Mechanism Parts
51
Position Drawing of Deck Mechanism Parts
52
Top View
52
Bottom View
52
Disassembly and Assembly of Deck Mechanism
53
Plate Top Disassembly
54
Holder Assembly CST
54
Rack F/L
54
Arm Assembly F/L
54
Lever Assembly S/W
54
Motor Assembly L/D
56
Gear Wheel
56
Arm Assembly Cleaner
56
Head F/E
56
Base Assembly A/C Head
56
Brake Assembly T
57
Arm Assembly Tension
57
Reel S / Reel T
57
Base Assembly P4
58
Opener Lid
58
Arm Assembly Pinch
58
Arm T/Up
58
Supporter, Capstan
59
Belt Capstan/Motor Capstan
59
Lever F/R
59
Clutch Assembly D37
59
Gear Drive/Gear Cam
60
Gear Sector
60
Brake Assembly Capstan
60
Plate Slider
60
Lever Tension
60
Lever Spring
60
Lever Brake
60
Gear Assembly P2/Gear Assembly P3
61
Base Assembly P2/Base Assembly P3
61
Base Loading
61
Base Tension
62
Arm Assembly Idler Jog
62
Deck Mechanism Adjustment
63
Fixtures and Tools for Service
63
Previous Preparation for Deck Adjustment
65
Torque Measuring
65
Prior Adjustment
66
Fine Adjustment
66
Guide Roller Height Adjustment
66
Prior Adjustment
67
Fine Adjustment (Azimuth Adjustment)
68
X-Distance Adjustment
68
Adjustment of Drum Assembly (Video Heads)
69
Deck Assembly
69
CUE or REV
69
Check of Tape Curl and Jam Status
69
Removal of Foreign Materials
70
Grease Application
72
Guide for Troubleshooting
74
Deck Mechanism
74
Front Loading Mechanism
77
Exploded Views
79
Front Loading Mechanism Section
79
Moving Mechanism Section(1)
80
Moving Mechanism Section(2)
81
Replacement Parts List
83
Other manuals for LG GC480W
User Guide
16 pages
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LG GC480W Specifications
General
Number of heads
4
Remote control
Yes
Tuner
Yes
Video Head
4 Head
Playback Speed
SP, LP
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