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Stereo System
OK75
Page 2
LG OK75 - Page 2
87 pages
Manual
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CONTENTS
SECTION 1
........
GENERAL
SECTION 2
........
CABINET & MAIN CHASSIS
SECTION 3
........
ELECTRICAL
SECTION 4
........
MECHANISM (DM19D)
1-1
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
1
3
Table of Contents
Main Page
Table of Contents
3
Servicing Precautions
4
Esd Precautions
6
Hidden Key Mode
7
Hidden Key Mode Table
7
Hidden Key Mode Description
7
Program Download Guide
8
Fota Update Step Using Bt App
11
Specifications
13
Disassembly Instructions
15
Exploded Views
22
Cabinet and Main Frame Section
22
Deck Mechanism Section
23
Packing Accessory Section
24
One Point Repair Guide
27
Power
27
Booting When Power on the Set
29
Vfd Is Not Displayed When Power on the Set
30
Booting (in CD/Usb Function)
31
Operation of MD
34
Sound
39
Electrical Troubleshooting Guide
48
Power (Smps)
48
Mcs Part Check
51
Fld Display Check
52
Pwm Modulation Check
53
Power Amp Part Check
54
Tuner / Aux Function Check
55
Tuner Function Check
56
CD Function Check
57
Double Usb Function
58
Waveforms of Major Check Point
59
Dsp (Ic501)
59
Sdram (Ic502)
60
Servo (Ic401)
61
Motor Driver (Ic400)
62
Adc (Ic301)
63
Usb (Cn502)
63
Bluetooth (Cn504)
64
Wiring Diagram
66
Block Diagram
67
Circuit Voltage Chart
68
IC Voltage
68
Fan Motor Voltage
68
Smps Capacitor & Zener Diode
68
Main Capacitor
69
Connector Voltage
70
Printed Circuit Board Diagrams
72
Smps P.C.board Diagram
72
Main P.C.board Diagram
74
Top P.C.board Diagram
76
Jack & Rmc P.C.board Diagram
78
Sparkle Led up P.C.board Diagram
79
Sparkle Led down P.C.board Diagram
79
X-Flash Led up Left P.C.board Diagram
80
X-Flash Led up Right P.C.board Diagram
80
Speaker Led P.C.board Diagram
80
Deck Mechanism Disassembly
83
Cover Top
83
Clamp Assembly
83
Plate
83
Magnet
83
Clamp
83
Tray Disc
84
Pick up Assembly
85
Base Up/Down
85
Belt Loading
86
Gear Pulley
86
Gear Loading
86
Guide
86
Deck PCB Assembly
86
Motor Assembly
86
FFC Cable
86
Deck Mechanism Exploded View (Dm19D)
87
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