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MCV903 Series
LG MCV903 Series Service Manual
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Copyright ©
2008 LG Electronics
.
Inc.
All right reserved.
Only for tr
aining and ser
vice purposes
LGE Internal Use Only
F
G
A
D
L
B
C
C
SMPS
SUB
M
AIN
CD
H
I
G
L
D
J
A
F
I
K
E
B
J
E
276
262
250
451
272
266
265
451
259
260
271
451
274
270
A43
CABLE3
CABLE1
CABLE2
A00
451
289
451
277
281
451
282
A52
285
451
451
451
305
451
278
A47
A46
451
283
301
283
453
451
453
302
451
A51
A56
A41
275
A26
280
451
288
265
274
FRONT
K
CABLE4
H
2-1
2-2
1.
CABINET AND MAIN FRAME SECTION
SECTION 2.
EXPLODED
VIEWS
NOTES)
THE EXCLAMATION POINT WITHIN AN
EQUILATERAL TRIANGLE IS INTENDED
TO ALERT THE SERVICE PERSONNEL
TO THE PRESENCE OF IMPORTANT
SAFETY INFORMATION IN SERVICE
LITERATURE.
11
13
Table of Contents
Section 1. General
3
Servicing Precautions
3
Notes Regarding Handling of the Pick-Up
3
Notes Regarding Compact Disc Player Repairs
4
Esd Precautions
5
Location of Users Controls
6
Front / Back Panel
6
Remote Control
7
Specifications
8
Section 2. Exploded Views
12
Cabinet and Main Frame Section
12
Tape Deck Mechanism Exploded View
13
Tape Deck Mechanism (A/R & A/S : Right A/R Deck)
13
CD Mechanism Exploded View
15
Speaker Exploded View
16
Packing Accessory View
20
Optional Parts
20
Section 3. Audio Electrical Part
22
Micom Part Check I
22
Fld Display Check
25
Troubleshooting
25
Tape Play Part Check
30
Tape Rec Part Check
31
Pwm Modulation Part Check
35
Power Amp Part Check
38
INTERNAL BLOCK DIAGRAM of Ics
40
Pin Configuration
41
System Block Diagram
45
Functional Block Diagram
46
Wiring Diagram
50
Main & Front Block Diagram
51
Smps Schematic Diagram
53
Interface Schematic Diagram
56
Deck Schematic Diagram
57
Woofer Amp Schematic Diagram
59
Front Schematic Diagram
60
Printed Circuit Board Diagrams
65
Smps P.C. Board Diagram
65
Front P.C. Board Diagram
70
Section 4. CD Electrical Part
74
Usb Function
75
Waveforms of Major Check Point
76
Audio Path
76
Dsp Schematic Diagram
78
Rf Servo Schematic Diagram
79
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LG MCV903 Series Specifications
General
Brand
LG
Model
MCV903 Series
Category
Stereo System
Language
English
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