Denon DVD-2900 Service Manual

SERVICE MANUAL
MODEL DVD-2900
DVD AUDIO-VIDEO / SUPER AUDIO CD PLAYER
For U.S.A., Canada, Europe
& Japan model
16-11, YUSHIMA 3-CHOME, BUNKYOU-KU, TOKYO 113-0034 JAPAN
Telephone: 03 (3837) 5321
X0168V.02 DE/CDM 0304
注 意
サービスをおこなう前に、このサービスマニュアルを
必ずお読みください。本機は、火災、感電、けがなど
に対する安全性を確保するために、さまざまな配慮を
おこなっており、また法的には「電気用品安全法」に
もとづき、所定の許可を得て製造されております。
従ってサービスをおこなう際は、これらの安全性が維
持されるよう、このサービスマニュアルに記載されて
いる注意事項を必ずお守りください。
● 本機の仕様は性能改良のため、予告なく変更すること
があります。
● 補修用性能部品の保有期間は、製造打切後
8年です。
Some illustrations using in this service manual are
slightly different from the actual set.
●
●
Please use this service manual with referring to
the operating instructions without fail.
●
For purposes of improvement, specifications and
design are subject to change without notice.
●
修理の際は､必ず取扱説明書を参照の上、作業を行って,
ください。
● 本文中に使用しているイラストは、説明の都合上現物
と多少異なる場合があります。
Ver. 2
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T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
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TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com

Denon DVD-2900 Specifications

General

Brand	Denon
Model	DVD-2900
Category	DVD Player
Language	English

Summary

SAFETY PRECAUTIONS

LEAKAGE CURRENT CHECK

Check leakage current and line-to-chassis resistance before returning unit to customer.

LASER RADIATION

Warning about direct staring into laser beam or viewing with optical instruments.

DISASSEMBLY

1. Top Cover

2. Loader Panel, Front Panel

2.1. When the Disc Tray can be ejected electrically

Steps to eject disc tray electrically and remove panels.

2.2. When the Disc Tray cannot be ejected electrically

3. Video P.W.B.

4. DVD Mecha.

5. Audio P.W.B./Power P.W.B.

6. Mecha.Unit

7. Traverse Unit Disassembly

Detailed steps for disassembling the Traverse Unit.

7.1. Guide Clamp Bracket disassembly

7.2. Tray disassembly

7.3. Traverse Unit disassembly

DIAGNOSTICS OF OPTICAL PICKUP AND REPLACING TRAVERSE UNIT

2. Note for Handling the Laser Pick-Up

3. Replacement of the Laser Pick-up (Traverse Unit)

4. Iop Measurement Method

4.1. DVD Laser current measurement

Procedure to measure DVD laser drive current using oscilloscope.

4.2. CD Laser current measurement

Procedure to measure CD laser drive current using oscilloscope.

5. Optical Pick-up Diagnostics and Replacement

SERVICE MODE

1. Aging Mode

2. Initial Setting Mode

3. μ-Com Firm Check Mode

4. Setting up the test mode

TROUBLE SHOOTING

1. GU-3494 MAIN PWB

Troubleshooting guide for the GU-3494 Main Printed Wiring Board.

1.1. FL TUBE doesn’t light

Diagnostic steps when the FL display tube does not light up.

1.2. Image is not displayed. (Blue-back, DENON wallpaper)

Troubleshooting steps when no image is displayed on screen.

1.3. Does not Read Disc

Troubleshooting steps when the unit does not read discs.

1.4. No sound, Noise generated

Troubleshooting steps for no sound or noise issues.

2. GU-3495 AUDIO P.W.B.

2.1. No sound or Noise generated at audio output terminal.

Troubleshooting steps for audio output problems.

2.2. Does not output Digital output signal(DOUT).

Troubleshooting steps when digital output signal is missing.

3. GU-3497 VIDEO PWB

(1) Progressive output does not outputed.

Troubleshooting steps for missing progressive video output.

(2) Interlace output does not outputed.

Troubleshooting steps for missing interlaced video output.

ELECTRICAL ADJUSTMENT FOR VIDEO

1. SETTING

2. BEFORE ADJUSTMENT

2.1. Setting the Oscilloscope as below.

2.2. Preparation

2.3. Procedure

Step-by-step instructions for adjusting video output signals.

NOTE FOR PARTS LIST

PARTS LIST OF P.W.B. UNIT ASS’Y GU-3494 MAIN UNIT

PARTS LIST OF EXPLODED VIEW

PARTS LIST OF DVD MECHANISM UNIT

POINTS OF GREASING

MEASURING METHOD AND WAVEFORMS

WAVEFORMS

NOTE FOR SCHEMATIC DIAGRAM