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CM8440 Series
LG CM8440 Series User Manual
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3-30
ELECTRICAL TROUBLESHOOTING GUIDE
CD FUNCTION
Check FFC cable
to CN404, CN405.
Is motor_open/ close OK?
(IC408 Pin6, 7)
Check IC408.
MON_MPD(CN404 Pin22)
about 180 mV?
Check IC501.
Check Loading motor.
Check IC501.
OPU driving
(Focusing & Tracking) OK?
Check OPU.
(Pick-up module)
Is motor impedance
about 12
Ω
?
IC407
Pin51, 52, 53 I2S output
signal OK?
Can
disc insert?
IC501
Pin N1, N2, N4 I2S input
signal OK?
Disc reading OK?
NO
NO
NO
NO
NO
NO
NO
NO
NO
IC407
RF & Servo signal
OK?
Focusing/
Tracking/ Sled signal
OK?
LOAD +, - OK?
YES
YES
YES
YES
YES
NO
YES
YES
YES
A
3. NO AUDIO PART
50
52
Table of Contents
Section 1 Summary
3
Table of Contents
3
Servicing Precautions
4
Esd Precautions
6
Hidden Key Mode
7
Service Information for Eeprom
8
Program Download & Update Guide
9
Specifications
13
Section 2 Cabinet & Main Chassis
14
Exploded Views
16
Cabinet and Main Frame Section (Cm8440)
16
Mechanism Deck Section (Dp17Tm2)
17
Packing Accessory Section
18
Speaker Section
19
Section 3 Electrical
22
One Point Repair Guide
23
Power
23
Booting When Power on the Set
25
Vfd Is Not Displayed When Power on the Set
26
Booting in CD/Usb Function
28
Operation of MD (Driving the Servo Motors)
33
Sound
38
Audio Output Is Small or no Audio Output
43
Power on (Standby Led Is Blinking)
44
Speaker no Audio
45
Electrical Troubleshooting Guide
46
Power Supply on Smps Board
46
System Part
50
Audio Part
51
Waveforms of Major Check Point
56
Wiring Diagram
60
Block Diagrams
61
Smps Block Diagram
61
Main System Block Diagram
62
Main Power Block Diagram
63
Circuit Diagrams
64
Smps - Power #1 Circuit Diagram
64
Smps - Power #2 Circuit Diagram
65
Main - CD Dsp Circuit Diagram
66
Main - Rf / Servo Circuit Diagram
67
Main - Adc / Pwm Circuit Diagram
68
Main - Amp Circuit Diagram
69
Front Volume Circuit Diagram
70
MIC & Portable Circuit Diagram
71
Circuit Voltage Chart
72
Connectors
72
Capacitors
72
Printed Circuit Board Diagrams
73
Smps P.C.board
73
Main P.C.board
75
Front Volume P.C.board
77
MIC & Portable P.C.board
78
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LG CM8440 Series Specifications
General
Brand
LG
Model
CM8440 Series
Category
Stereo System
Language
English
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