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CM4520
LG CM4520 Service Manual
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USB FUNCTION
Check USB_5V.
Display “NO USB”.
YES
YES
Check USB_D+/D-
(R501,R502).
YES
Plug-in usb device.
Check CN502.
NO
NO
YES
Display “READ”.
YES
Display “NO FILE”.
YES
Check usb jack (JK501/ JK502).
NO
Replace IC801.
NO
Check IC801(Pin116, 117).
Check usb audio
fi
le in usb device
(MP3, WMA
fi
le is playable)
YES
2. DOUBLE USB FUNCTION
3-28
CDP ELECTRICAL TROUBLESHOOTIHG GUIDE
46
48
Table of Contents
Section 1 Summary
3
Default Chapter
3
Table of Contents
3
Servicing Precautions
4
Esd Precautions
6
Service Information for Eeprom
7
1 Audio Program
8
Program Download Guide
8
400 CD Program
9
3 Eq Program
10
Specifications
11
Section 2 Cabinet & Main Chassis
12
Exploded Views
14
Cabinet and Main Frame Section (Cm4520)
14
Mechanism Deck Section (Dp-12Am)
15
Packing Accessory Section
16
Speaker Section
17
Section 3 Electrical
20
One Point Repair Guide
21
Power
21
Booting When Power on the Set
23
Vfd Is Not Displayed When Power on the Set
24
Operation of MD
26
Sound
31
Audio Electrical Troubleshooting Guide
35
Power (Smps)
35
Μ-COM PART CHECK
39
Ic101(M24C16) Check
39
Fld Display Check
40
Pwm Modulation Check
41
Power Amp Part Check
43
Tuner / aux Function Check
44
Tuner Function Check
45
Cdp Electrical Troubleshooting Guide
46
CD Function
46
Double Usb Function
47
Waveforms
48
Wiring Diagram
52
Block Diagrams
53
Overall Block Diagram
53
Smps Block Diagram
54
Circuit Diagrams
55
Smps Circuit Diagram
55
Main - Dsp Circuit Diagram
56
Main - Micom Circuit Diagram
57
Main - Amp Circuit Diagram
58
Main - Servo Circuit Diagram
59
Front Circuit Diagram
60
Circuit Voltage Chart
61
Printed Circuit Board Diagrams
63
Smps P.C.board
63
Main P.C.board
64
Front P.C.board
65
Other manuals for LG CM4520
Owner's Manual
28 pages
4
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LG CM4520 Specifications
General
Brand
LG
Model
CM4520
Category
Stereo System
Language
English
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