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JVC
Home Theater System
TH-A25
JVC TH-A25 Service Manual
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1-24 (No.MB141)
5.2.8
CLV Servo Does Not Work
CLV
Servo
Does not Work
Is XSRFIN(pin2 of SIC1)
normal?
Is RF(pin21 of RCN1)
normal?
Check connection between PCB
and MECHA
Check peripheral circuit of SIC1
Check peripheral circuit of DRIC1
Check peripheral circuit of RIC1
8
N
N
Y
Y
23
25
Table of Contents
Area Suffix
1
Table of Contents
1
Specification
2
Precaution
3
Safety Precautions
3
Warning
3
Critical Parts for Safety
3
Preventing Static Electricity
4
Grounding to Prevent Damage by Static Electricity
4
Ground Yourself
4
Ground the Workbench
4
Importance Administering Point on the Safety
5
Specific Service Instructions
6
Main Body Section
7
Removing the Top Cover
7
Disassembly
7
Removing the Tray Door
8
Removing the Fan Motor
9
Removing the DVD Mechanism Assembly
9
Removing the Tuner Pack
9
Removing the Front Panel Assembly
9
Removing the Rear Panel
10
Removing the Video Board
10
Removing the Function Board
10
Removing the Main Board
11
Removing the Power Trans
11
Front Panel Assembly Section
12
Removing the Front Board
12
Removing the Power SW Board
12
Adjustment
13
Main
14
Power
14
Troubleshooting
14
Output
15
Protection(When High Voltage at Protectiion Port)
16
DVD Servo Parts
18
Initial Operation after Power on
18
Play Operation
19
Pickup Head Initial Position
20
Disc Presence/Absense Judgment
21
Disc Motor Does Not Rotate
22
Focus Servo Does Not Work
22
Tracking Servo Does Not Work
23
CLV Servo Does Not Work
24
DVD MPEG Parts
25
Initial Operation after no
25
Schematic Diagrams
29
Block Diagram
32
Standard Schematic Diagrams
34
Main Section
34
Function Section
36
Front Display Section
38
Video Section
39
DVD Loader Section
40
DVD MPEG DEC Section
42
Printed Circuit Boards
44
Main Board
44
Function Board
46
Front Board
48
DVD Servo Control Board
50
Reverse Side
51
Video Board
52
Parts List
54
Exploded View of General Assmbly and Parts List
55
General Assembly
57
Electrical Parts List
58
Main Board
58
Jack Board
64
Packing Materials and Accessories Parts List
69
Packing and Accessories
70
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Instructions
144 pages
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JVC TH-A25 Specifications
General
Brand
JVC
Model
TH-A25
Category
Home Theater System
Language
English
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