Sony DVP-NS300 Guida all'installazione

Training Manual

5th Generation

DVD Player

Models: DVP-NS300 DVP-NC650

DVP-NS315 DVP-NC655P

DVP-NS400D DVP-CX875P

DVP-NS415 DVP-F25

DVP-NS500P DVO-F41MS

DVP-NS700P

DVP-NS715P

DVP-NS755P

DVP-NC600

Circuit Descriptions & Troubleshooting

DVP-NS415

DVP-NS655P DVP-NS875P

Table of Contents

1. What’s New?......................................1

Physical Differences............................................. 1

Features ................................................................. 2

Dual Laser Optical Block ..................................... 3

Disc Identification.................................................. 5

Super Audio Compact Disc (SACD) .................. 6

Logos ...................................................................... 7

Video Noise Reduction ........................................ 8

2.Blockdiagram ..................................10

3.PowerSupply ...................................12

Plug-In Communications .................................... 15

4.TestingandTestPointAccess.......18

5. Testing ...............................................22

Jigs and Tools ....................................................... 25

6. Troubleshooting...............................27

Process Flow........................................................ 27

7.Service/TestMode .........................32

8. Mechanical Operation .....................35

Powering the Unit................................................. 34

CD Mechanism Normal Operation.................... 35

Disc Loading, Stacker and Disc Clamping

Motor Drive Access.............................................. 37

1. What’s New?

Chapter 1 - What’s New?

The popular fifth generation Sony DVD players introduced for the years 2001 and 2002 are physically and

electrically different from previous generation players; they have greater appeal and are lower in cost.

PhysicalDifferences

The single disc players are thinner than the previous fourth generation models and take up less vertical space.

Some models are available in both black and silver (same model number) to blend with different decors. Two

models, DVP-F25 and DVP-F41, have slot type loading (like a car CD player) which makes them smaller; they

can also be played horizontally or vertically; a pedestal base can be attached to the side for vertical mounting, as

in Figure 1-1.

DVD slot

Models DVP-F25 / F41

FIGURE 1-1 - VERTICAL MOUNTED “F” SERIES DVD PLAYER

1. What’s New?

Features

These players can play computer “burned” -R and +RW (CD or DVD) discs. A built-in MP-3 decoder allows MP-

3 encoded CD’s to be played. All 5th generation players have outputs for composite video, component video (Y,

R-Y, B-Y) and Dolby Digital ™ / dts ® digital coax/optical digital audio (except DVP-F25 and DVP-F41 models

which only have high grade component video and optical audio outputs) Other features on some models are:

multi-format SACD music CD PB (audio); and high resolution 480p progressive video output.

Table 1-1 shows some of the features of the Fifth Generation models.

Table 1-1 -Sony’s Popular Fifth Generation DVD Players

Model Number Intro

Year * Type Feature

DVP-NS300 2001 1 disc tray Case = Blk or Silver finish. Does not

PB –R or +RW discs.

DVP-NS315 2002 1 disc tray Black or Silver finish

DVP-NS400D 2001 1 disc tray Built in 5.1 Digital Dolby Decoder

DVP-NS415 2002 1 disc tray Silver, Built in 5.1 Digital Dolby

Decoder

DVP-NS500P 2001 1 disc tray Progressive scan

DVP-NS700P 2001 1 disc tray Progressive scan

DVP-NS715P 2002 1 disc tray Progressive scan, Silver

DVP-NS755P 2002 1 disc tray Progressive scan, SACD, Built in 5.1

Digital Dolby Decoder, Blk.

DVP-NC600 2001 5 disc Changer No thinner case like the tray units.

DVP-NC650 2001 5 disc Changer SACD

DVP-NC655P 2002 5 disc Changer Progressive scan, Blk/Silver.

DVP-CX875P 2002 300 disc changer Progressive scan, Built in 5.1 Digital

Dolby Decoder.

DVP-F25 2002 1 disc slot Case = Blk or Silver finish.

DVP-F41MS 2002 1 disc slot Memory stick for JPEG pix view

* Optical Assemblies for 2001 year Models are KHM240AAA and KHM250AAA Optical

Assemblies for 2002 year Models are KHM270AAA and KHM275AHA.

1. What’s New?

DualLaser OpticalBlock

Disc Playback Characteristics

All fifth generation DVD models, (except basic model DVP-NS300) can play back computer made –R or +RW

discs.

Computer made (burned) –R or +RW discs have different characteristics than machine stamped counterparts

and stamped CDs have different characteristics than DVDs. To insure full compatibility, the optical block uses

two lasers. One is optimized for CDs and the other for DVDs.

To understand how separate lasers insure playback of computer burned discs, some basics are explained here.

The reflected Laser light from the disc to the optical block contains the data. DVD discs (including DVD-R and

+RW discs) reflect best in the 650-635nM wavelength band. CD discs (including –R or +RW discs) reflect light

best at 780nM.

Figure1-2 shows thatmaximum CD-R discreflection (RF) occursat 780nM. Since –Ror +RW discshavelower

reflectivity than stamped discs (reflectivity also varies from brand to brand) output is maximized if two lasers are

used: one operating at 648nM for DVDs and another at 780nM for CDs.

Optical Pick-up

650nM 780nM Wavelength

Reflective

Intensity for

CD-R

For DVD

CD = 1.2cm

DVD=0.6cm

For CD

Lens

KHM-240

FIGURE 1-2

1. What’s New?

OPTICAL

ASSEMBLY

PIVOT

PIVOTS

DOWN

(LIMITED RANGE)

DISC

WHOLE

ASSEMBLY

ROTATES

FROM

HORIZONTAL

A TILT SERVO WARP

DISC COMPENSATION

B DTC WARP

DISC COMPENSATION

MOTOR

OPTICAL

ASSEMBLY

PIVOTS UP

PIVOT

DISC WHOLE

ASSEMBLY

ROTATES

FROM

HORIZONTAL

LENS

OPTICAL

ASSEMBLY

DISC ILLUSTRATES

ROTATION OF

LENS

ONLY

ASSEMBLY REMAINS

HORIZONTAL

LENS

OPTICAL

ASSEMBLY

DISC

ASSEMBLY REMAINS

HORIZONTAL

ILLUSTRATES

ROTATION OF

LENS

ONLY

LENS

GGW5 1545 4/9/03

FIGURE 1-3 - TILT SERVO (A) VS. DTC (B)

Disc Warp Correction

Because of the finer DVD pitch, the laser must be perpendicular to the disc for maximum RF output from the

optical block. Figure 1-3 illustrates the differences between old servo tilt mechanism system (A) and the new

DTC system (B) that keeps the laser beam perpendicular. In earlier generations, a tilt servo (A) adjusted the

angle of the laser platform to keep the monitored RF level at peak. This system is complex and the platform can

“bottom out”, limiting its range.

1. What’s New?

In fifth generation DVD players, an ingenious Dynamic Tilt Correction (DTC) system replaces the tilt servo.

Warped disc readability is achieved by tilting the lens during focus correction. The greater the focus correction,

the more the tilt.

The DTC concept and mechanics are as follows:

The DVD disc information layer is at a height determined by the spindle motor hub. This is considered as the

mechanical focus center of the lens. As the optical block moves towards the outside of the disc, disc warp

increases. At the points where the disc is angled up by warp, the focus point also moves up to compensate.

Raising the focal point causes the lens to change its angle and remain perpendicular to the disc. Conversely,

when the disc angles down (Figure 1-2 B), the lens focus goes below center and the lens tilts in the opposite

direction.

Mechanically, DTC is achieved by modifying the lens supports. The front lens supports are stronger than the

rear. See Figure 1-4. As the lens moves up, it is tilted toward the weaker support. As it moves down, the lens is

tiltedtowardthestrongersupport. Thetiltisalwaysinthedirectionofthewarpagesothelensremainsperpendicular

to the disc.

Disc Identification

The DVD player first determines what type of disc is in the tray before playing it. The player powers up one of the

lasers and begins looking for the disc’s information layer(s). The time it takes to find a layer determines how

deep the layer is inside the disc (T=0.6cm, 2T =1.2cm). Because the tracking servo is disabled at this time, the

lens will continue past the focus point of the DVC and look for a second information layer (DL disc). The disc ID

method is shown in Figure 1-5. This procedure is repeated with the second laser to insure identification of the

lower output –R and +RW discs.

Lens

Weak

Rear

Support

Stronger

Front

Support

Figure 1-4 -Lens

Retaining DTC System

FIGURE 1-4 - DTC SYSTEM

1. What’s New?

SuperAudioCompactDisc(SACD)

There are three types of SACDs, all played from the bottom of the disc (disc is not flipped over): See Figure

1-6.

1. Single Layer: The single high-density (HD) layer can contain 2 channel and multi-channel DSD recordings,

text (such as song tiles and lyrics), video clips and graphics.

Figure 1-5 also shows that the laser takes the least time to find a DVD disc (Figure 1-5, B, C, or D). If a second

focal point is also found, the disc is either a dual layer DVD (Figure 1-5 C) or SACD (Figure 1-5 D).

1.2 CM

DISC ENTRY

INFO LAYER

Disc Type

INFO LAYER

DVD/

SACD

SL 0.6 CM

DISC ENTRY

1stLAYER

DVD/

SACD

DL 0.6 CM

DISC ENTRY

2ndLAYER

HD LAYER

SACD-

Hybrid 0.6 CM

DISC ENTRY

CD layer

1.2 CM

DISC IDENTIFICATION 2T

tDL

thybrid

SACD layer CD layer

FIGURE 1-5 - DISC IDENTIFICATION

1. What’s New?

2. Dual layer - Two layers with twice the playing time / information as a single layer.

3. Hybrid layer – Contains one HD layer and a standard CD layer so it can be played on any standard CD player

too.

Logos

High-end products that can play one or all versions of SACD discs have at least one of three of the logos

shown in Figure 1-7.

Single layer disc

Dual layer disc

Hybrid disc

layer

2 HD layers

CD layer

layer

FIGURE 1-6 - SACD TYPES

Front L Center Front R

Subwoofer

Rear L Rear R

FIGURE 1-7 -SACD LOGOS

1. What’s New?

Video Noise Reduction

Block Noise Reduction (BNR)

BNR reduces dissimilarities (noise) at the edges of blocks (Figure 1-8).

Digital Video Enhancer (DVE)

DVE corrects the frequency response of the video signal and emphasizes picture details, see Figure 1-9. Since

DVE (Digital Video Enhancer) emphasizes BLOCK NOISE, the BNR circuit is used before the DVE .

Block Noise Reduction

The Block Noise Reduction reduces noise at vertical

rising (block) edges caused by the MPEG format.

The picture looks more smother and more natural.

Picture details, even very small once, are not effected.

FIGURE 1-8 - BLOCK NOISE REDUCTION

: Original Signal :Optimized Signal

DVE = Digital Video Enhancer

it emphasizes picture details

FIGURE 1-9 - DIGITAL VIDEO ENHANCER

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