Sony DNE-520 Service manual

D-NE520

SERVICE MANUAL

Ver. 1.4 2005.11

Photo: SILVER

US Model

Canadian Model

AEP Model

UK Model

E Model

Australian Model

Model Name Using Similar Mechanism D-NE920

CD Mechanism Type CDM-3325ERV2

Optical Pick-up Name DAX-25EV

System

Compact disc digital audio system

Laser diode properties

Material: GaAlAs
Wavelength: λ = 770 - 800 nm
Emission duration: Continuous
Laser output: Less than 44.6 µW
(This output is the value measured at a distance
of 200 mm from the objective lens surface on the
optical pick-up block with 7 mm aperture.)

D-A conversion

1-bit quartz time-axis control

Frequency response

20 - 20 000 Hz

Output (at 3 V input level)

Line output (stereo minijack)
Output level 0.7 V rms at 47 kΩ
Recommended load impedance over 10 kΩ

+1

dB (measured by JEITA)

-2

SPECIFICATIONS

Headphones (stereo minijack)
Approx. 5 mW + Approx. 5 mW at 16 kΩ
(Approx. 1.5 mW + Approx. 1.5 mW at 16 kΩ)*
*For the customers in Europe

Power requirements

• Sony NH-7WMAA rechargeable battery:

1.2 V DC × 1

• LR6 (size AA) battery: 1.5 V DC × 1

• AC power adaptor (DC IN 3 V jack)
220 V, 50 Hz (Model for China)
120 V, 60 Hz (Model for Mexico)

Operating temperature

5°C - 35°C (41°F - 95°F)

Dimensions (w/h/d) (excluding projecting parts
and controls)

Approx. 129 × 29.6 × 140.8 mm
(5 1/8 × 1 3/16 × 5 5/8 in.)

Mass (excluding accessories)

Approx. 170 g (6.0 oz.)

Supplied accessories

• AC power adaptor

• Earphones

• Rechargeable battery

• Battery carrying case

• Remote control (Remote) (For this CD player only)

• CD-ROM (SonicStage)

• Operating instructions

• Installation/Operating Guide

US and foreign patents licensed from Dolby
Laboratories.

Design and specifications are subject to change
without notice.

9-879-357-05

2005K16-1
© 2005.11

PORTABLE CD PLAYER

Sony Corporation

Personal Audio Division
Published by Sony Engineering Corporation

D-NE520

CAUTION

• INVISIBLE LASER RADIATION
WHEN OPEN

• DO NOT STARE INTO BEAM OR
VIEW DIRECTLY WITH OPTICAL
INSTRUMENTS

• CLASS 1M INVISIBLE LASER
RADIATION WHEN OPEN

• DO NOT VIEW DIRECTLY WITH
OPTICAL INSTRUMENTS

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270 °C

during repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering

or unsoldering.

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be

damaged by heat.

UNLEADED SOLDER

Boards requiring use of unleaded solder are printed with the lead­free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with

the lead free mark due to their particular size)

: LEAD FREE MARK

Unleaded solder has the following characteristics.

• Unleaded solder melts at a temperature about 40 °C higher

than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if

the heated tip is applied for too long, so be careful!

• Strong viscosity

Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.

• Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

On AC power adaptor

• Use only the AC power adaptor supplied.
If your CD player is not supplied with the
one, use the AC-E30HG AC power
adaptor. Do not use any other AC power
adaptor. It may cause a malfunction.

Polarity of the plug

• Do not touch the AC power adaptor with
wet hands.

• Connect the AC power adaptor to an easily
accessible AC outlet. Should you notice an
abnormality in the AC power adaptor,
disconnect it from the AC outlet
immediately.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANU AL OR
IN SUPPLEMENTS PUBLISHED BY SONY.

2

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE
FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS
QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT
DONNÉS DANS CE MANUEL OU D ANS LES SUPPLÉMENTS
PUBLIÉS PAR SONY.

D-NE520

You can play discs on this CD player.

Audio CDs:

CD-DA format CDs

CD-DA (Compact Disc Digital Audio) is a recording standard used for Audio CDs.

ATRAC CDs:

CD-R/CD-RW on which audio data compressed in the ATRAC3plus format
has been recorded by using SonicStage*

ATRAC3plus (Adaptive Transform Acoustic Coding3plus) is audio compression
technology that satisfies the demand for high sound quality and high compression
rates. ATRAC3plus can compress audio files to about 1/20 of their original size at 64
kbps.
Bit rates and sampling frequencies this CD player can play are:

ATRAC3 66/105/132 kbps 44.1 kHz
ATRAC3plus 48/64/256 kbps 44.1 kHz

Up to 62 characters can be displayed on this CD player.

MP3 CDs:

CD-R/CD-RW on which audio data compressed in the MP3 format has
been recorded by using a software other than SonicStage*

Bit rates and sampling frequencies this CD player can play are shown below. Variable
Bit Rate (VBR) files can also be played.

MPEG-1 Layer3 32 - 320 kbps 32/44.1/48 kHz
MPEG-2 Layer3 8 - 160 kbps 16/22.05/23 kHz
MPEG-2.5 Layer3 8 - 160 kbps 8/11.025/12 kHz

This CD player conforms to Version 1.0/1.1/2.2/2.3/2.4 of the ID3 tag format. ID3 tag
is a format for adding certain information (track name, album name, artist name, etc.)
to MP3 files. Up to 64 characters of ID3 tag information can be displayed on this CD
player.

CD-Extra and Mix-Mode CDs:

CD-R/CD-RW on which CD-DA format data and CD-ROM format data are
recorded together.*

If you cannot play your CD, change the "CD-EXTRA" setting in the OPTION menu.
Then you may play your CD.
An ATRAC CD on which audio data compressed in the MP3 format has been recorded
using software other than SonicStage can also be played.
With SonicStage, you cannot create a CD on which mixed format audio data is recorded.
* Only ISO 9660 Level 1/2 and Joliet extension format discs can be played.

Music discs encoded with copyright protection technologies

This product is designed to play back discs that conform to the Compact Disc (CD)
standard. Recently, various music discs encoded with copyright protectiontechnologies
are marketed by some record companies. Please be aware that among those discs,
there are some that do not conform to the CD standard and may not be playable by
this product.

Bit rates Sampling frequencies

Bit rates Sampling frequencies

TABLE OF CONTENTS

1. SERVICING NOTES ................................................ 4

2. GENERAL ................................................................... 5

3. DISASSEMBLY

3-1. Disassembly Flow ........................................................... 6

3-2. Upper Lid Assy................................................................ 7

3-3. SWITCH Board ............................................................... 8

3-4. Cabinet Middle Sub Assy................................................ 9

3-5. EGL Board, CD Mechanism Deck (CDM-3325ERV2).. 10

3-6. JACK Board..................................................................... 11

3-7. Turn Table Motor Assy (M901),

Sled Motor Assy (M902),

Optical Pick-up (DAX-25EV)......................................... 11

4. ELECTRICAL CHECKING.................................... 12

5. DIAGRAMS

5-1. Block Diagram ................................................................ 14

5-2. Printed Wiring Board – EGL Board (Side A) –.............. 15

5-3. Printed Wiring Board – EGL Board (Side B) –.............. 16

5-4. Schematic Diagram – EGL Board – ........................... 17

5-5. Printed Wiring Board – JACK Board (Side A) –............ 18

5-6. Printed Wiring Board – JACK Board (Side B) – ............ 19

5-7. Schematic Diagram – JACK Board – ............................. 20

5-8. Printed Wiring Board – SWITCH Board – .................... 21

5-9. Schematic Diagram – SWITCH Board – ...................... 22

6. EXPLODED VIEWS

6-1. Overall Assy .................................................................... 28

6-2. Cabinet (Lower) Section.................................................. 29

6-3. CD Mechanism Section (CDM-3325ERV2) ................... 31

7. ELECTRICAL PARTS LIST.................................. 32

3

D-NE520

Ver. 1.4

SECTION 1

SERVICING NOTES

NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.

NOTES ON LASER DIODE EMISSION CHECK

The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick­up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.

LASER DIODE AND FOCUS SEARCH OPERATION
CHECK

During normal operation of the equipment, emission of the laser
diode is prohibited unless the upper lid is closed while turning ON
the S501. (push switch type)
The following checking method for the laser diode is operable.

• Method:
Emission of the laser diode is visually checked.

1. Open the upper lid.

2. With a disc not set, turn on the S501 with a screwdri ver having
a thin tip as shown in Fig.1.

3. Press the u button.

4. Observing the objective lens, check that the laser diode emits
light.
When the laser diode does not emit light, automatic power
control circuit or optical pickup is faulty.
In this operation, the objective lens will move up and down 4
times along with inward motion for the focus search.

NOTES ON HANDLING OF PATCH

The handling of PATCH is necessary when a mounted EGL board
is exchanged or when EEPROM(IC1602) on an EGL board is
exchanged.
Please confirm in each service front office about the inf omation on
the handling of PATCH.

S501

lever, detector

JACK BOARD

Fig. 1 Method to push the S501

lever, detector

4

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D-NE520

This section is extracted
from instruction manual.

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D-NE520

Note: Disassemble the unit in the order as shown below.

3-1. DISASSEMBLY FLOW

SET

3-2. UPPER LID ASSY

(Page 7)

SECTION 3

DISASSEMBLY

3-4. CABINET MIDDLE

SUB ASSY

(Page 9)

3-5. EGL BOARD,

CD MECHANISM DECK

(CDM-3325ERV2)

(Page 10)

3-6. JACK BOARD

(Page 11)

3-3. SWITCH BOARD

(Page 8)

3-7. TURN TABLE MOTOR ASSY (M901),

SLED MOTOR ASSY (M902),

OPTICAL PICK-UP (DAX-25EV)

(Page 11)

6

Note: Follow the disassembly procedure in the numerical order given.

3-2. UPPER LID ASSY

2

two screws

4

bracket (hinge L)

3

bracket (hinge R)

D-NE520

1

Push two knobs and

open the upper lid.

8

upper lid assy

6

5

Close the cover until the tip of the cover of the
upper lid assembly is left open by 5 mm, then
slide the upper lid assembly in the direction
of the arrow.

7

7

D-NE520

3-3. SWITCH BOARD

3

1

cover lid

two screws

2

two screws

4

flat cable (CN1002)

5

SWITCH board

6

8

upper lid assy

led window

7

operate button

8

3-4. CABINET MIDDLE SUB ASSY

spring (lock claw)

open knob (R)

open knob (L)

2

three screws

3

two screws

D-NE520

4

open knob (L)

6

spring (lock claw)

1

5

open knob (R)

screw

8

cabinet middle sub assy

7

spring (upper lid)

9

D-NE520

)

3-5. EGL BOARD, CD MECHANISM DECK (CDM-3325ERV2)

8

two insulators

9

CD mechanism deck

(CDM-3325ERV2)

connector (2pin)

2

1

connector (4pin)

7

EGL board

5

8

insulator

6

flexible board (CN601)

4

Remove solder of the EGL board.(GND of C678

3

Remove solder of the JACK board.(TP446)

10

3-6. JACK BOARD

4

Remove solder of the JACK board.

1

9

JACK board

8

flat cable

D-NE520

5

coil spring (–)

7

battery terminal board (+)

2

3

To attach, align the switch position as shown.

6

Remove solder of the JACK board.

3-7. TURN TABLE MOTOR ASSY (M901), SLED MOTOR ASSY (M902), OPTICAL PICK-UP (DAX-25EV)

1

three screws
(B

1.7 × 4

)

5

three screws
(B

1.7 × 4

)

6

turn table motor assy (M901)

3

sled motor assy (M902)

2

gear cover

4

optical pick-up (DAX-25EV)

chassis

11

D-NE520

Oscilloscope

(AC range)

+
–

EGL board

TP691 (RF)
TP692 (GND A)

2 k

Ω

SECTION 4

ELECTRICAL CHECKING

The CD section adjustments are done automatically in this set.
In case of operation check, confirm that RF level.

Precautions for Check

1. Perform check in the order given.

2. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise
indicated.

3. Power supply voltage requirement : DC1.5V in battery termi­nals.

VOL button : Minimum
HOLD switch : OFF

Checking Location:

[EGL BOARD] (SIDE B)

TP692

GND A

TP691

RF

IC603

RF Level Check

Condition:

• Hold the set in horizontal state.

Connection:

Procedure:

1. Connect the oscilloscope to the test points TP691 (RF) and
TP692 (GND A) on the EGL board.

2. Set a disc. (YEDS-18)

3. Press the u button.

4. Check the oscilloscope waveform is as shown below.
A good eye pattern means that the diamond shape (◊) in the
center of the waveform can be clearly distinguished.

RF Signal reference Waveform (Eye Pattern)

VOLT/DIV : 100 mV (With the 10:1 probe in use)
TIME/DIV : 500 ns

RF level

0.55 to 0.6 Vp-p

To watch the eye pattern, set the oscilloscope to AC range and
increase the vertical sensitivity of the oscilloscope for easy
watching.

5. Stop revolving of the disc motor by pressing the x button.

12