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CM8440 Series
LG CM8440 Series User Manual
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3-31
ELECTRICAL TROUBLESHOOTING GUIDE
USB play
Replace IC300.
NO
IC300
USB power +5 VU
OK?
YES
A
A
When insert USB,
IC501 PinU7,U8,A7,A8 USB_D
signal OK?
NO
YES
YES
YES
YES
AUX
Check audio cable.
Replace IC202.
Check IC501.
NO
NO
NO
IC202
Pin7, 8 AUX input signal
OK?
IC202 Pin41
ADC/MIC_data output signal
OK?
IC202
Pin42,43,44 I2S input signal
OK?
51
53
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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