SONY DEJ785 - Service Manual Immediate Download

SERVICE MANUAL

Ver 1.0 2002.12

SPECIFICATIONS

PORTABLE CD PLAYER

D-EJ785

Canadian Model

AEP Model

UK Model

E Model

Australian Model

Chinese Model

Tourist Model

Model Name Using Similar Mechanism

NEW

CD Mechanism Type

CDM-3325ER

Optical Pick-up Name

DAX-25E

9-874-272-01

Sony Corporation

2002L0500-1

Personal Audio Company

2002.12

Published by Sony Engineering Corporation

System

Compact disc digital audio system

Laser diode properties

Material: GaAlAs

Wavelength:

= 780 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.)

Power requirements

For the area code of the model you purchased, check the

upper left side of the bar code on the package.

·Sony NH-WM2AA rechargeable batteries: 2.4 V DC

·Two LR6 (size AA) batteries: 3 V DC

·AC power adaptor (DC IN 4.5 V jack):

Canadian and Taiwan models: 120 V, 60 Hz

UK model: 230 V, 50 Hz

Australian model: 240 V, 50 Hz

AEP, East European, E, Korean and Tourist models:

100 - 240 V, 50/60 Hz

Hong Kong model: 230 V, 50/60 Hz

Chinese model: 220 V, 50 Hz

Mass (excluding accessories)

Approx. 155 g (5.5 oz)

Operating temperature

°C - 35°C (41°F - 95°F)

Design and specifications are subject to change without

notice.

Supplied accessories

AC power adaptor (1)

Headphones/earphones with remote control (1)

Rechargeable batteries (2)

Battery carrying case (1)

Dimensions (w/h/d) (without projecting

parts and controls)

Approx. 136.0

× 19.6 × 136.0 mm (5

8 ×

25/

32 × 5

8 in.)

Battery life* (approx. hours)

(When the CD player is used on a flat and stable place.)

Playing time varies depending on how the CD player is

used.

G-PROTECTION

off

Two NH-7WMAA

(charged for

about 2 hours**)

NH-WM2AA

(charged for

about 4 hours**)

Two Sony alkaline

batteries LR6 (SG)

(produced in Japan)

*Measured value by the standard of JEITA (Japan

Electronics and Information Technology Industries

Association).

** Charging time varies depending on how the

rechargeable battery is used.

D-EJ785

Notes on chip component replacement

·Never reuse a disconnected chip component.

· Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

Flexible Circuit Board Repairing

·Keep the temperature of the soldering iron around 270 °C dur-

ing 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.

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 MANUAL OR IN SUPPLEMENTS PUB-

LISHED BY SONY.

TABLE OF CONTENTS

SERVICING NOTES ............................................... 3

GENERAL ................................................................... 6

DISASSEMBLY

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

3-2. Spring (A)/(B) .................................................................

3-3. Lid (Upper) Sub Assy .....................................................

3-4. Cabinet (Front) Block .....................................................

3-5. Optical Pick-up Section (CDM-3325ER),

MAIN Board ...................................................................

ELECTRICAL CHECK .......................................... 10

DIAGRAMS

5-1. Block Diagram MAIN Section ................................ 11

5-2. Block Diagram

AUDIO/POWER SUPPLY Section .......................... 12

5-3. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 13

5-4. Printed Wiring Board

MAIN Board (Component Side) .............................. 14

5-5. Printed Wiring Board

MAIN Board (Conductor Side) ................................ 15

5-6. Schematic Diagram MAIN Board (1/3) .................. 16

5-7. Schematic Diagram MAIN Board (2/3) .................. 17

5-8. Schematic Diagram MAIN Board (3/3) .................. 18

5-9. IC Pin Function Description ........................................... 21

EXPLODED VIEWS

6-1. Front Cabinet Section ..................................................... 26

6-2. Rear Cabinet Section ...................................................... 27

6-3. Optical Pick-up Section (CDM-3325ER) ....................... 28

ELECTRICAL PARTS LIST ............................... 29

CAUTION

Use of controls or adjustments or performance of procedures

other than those specified herein may result in hazardous ra-

diation exposure.

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

DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

On AC power adaptor

· Use only the AC power adaptor supplied. Do not use

any other AC power adaptor. It may cause a

malfunction.

Polarity of the plug

D-EJ785

SECTION 1

SERVICING NOTES

The laser diode in the optical pick-up block may suffer electro-

static breakdown because of the potential difference generated by

the charged electrostatic load, etc. on clothing and the human body.

During repair, pay attention to electrostatic breakdown 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

pick-up block. Therefore, when checking the laser diode emis-

sion, observe from more than 30 cm away from the objective lens.

BEFORE REPLACING THE OPTICAL PICK-UP BLOCK

Please be sure to check thoroughly the parameters as par the "Op-

tical Pick-Up Block Checking Procedures" (Part No.: 9-960-027-

11) issued separately before replacing the optical pick-up block.

Note and specifications required to check are given below.

· FOK output: IC601 yg pin

When checking FOK, remove the lead wire to disc motor.

· RF signal P-to-P value: 0.45 to 0.65 Vp-p

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 S801. (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 S801 with a screwdriver having

a thin tip as shown in Fig.1.

3. Press the B X key.

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 5

times along with inward motion for the focus search.

NOTES ON HANDLING THE OPTICAL PICK-UP

BLOCK OR BASE UNIT

Fig. 1 Method to push the S801

S801

detection lever

MAIN board

ABOUT CD-Rs/CD-RWs

· This CD player can play CD-Rs/CD-RWs recorded in the Com-

pact Disc Digital Audio (Audio CD) format, but playback capa-

bility may vary depending on the quality of the disc and the

condition of the recording device.

D-EJ785

TAP802

(OPEN)

TAP801

(TEST)

3. Operation of Keys and Knobs in Service Mode

The following operation can be checked by operating the buttons

on the set and remote commander.

· B X key on the set or X key on the remote commander

Focus and tracking/sled servo off

Spindle servo on

Note: Do not look directly at the laser beam from the optical pick-up.

[HOLD] switch is on:

Auto adjustment value a becomes as follows each time the key is

pressed.

1) [TRK:MIN:SEC] = RF:FE :TE

DC offset adjustment value

2) [TRK:MIN:SEC] = EF:

:EF

balance adjusted value

3) [TRK:MIN:SEC] = Ga:FG:TG

gain adjusted value

[AVLS] switch is on:

Press CHARGE x and B X keys on the set or x and X keys

on the remote commander simultaneously, and RF gain changes

to 0 dB (for normal CD) and +12 dB (for CD-RW).

· . / > keys on the set or B > / . knobs on the

remote commander

Tracking servo off

Optical pick-up movement (outward or inward)

Note: Do not move forcibly the optical pick-up exceeding the most-out-

side or most-inside track.

· CHARGE x key on the set or x key on the remote commander

All servos (focus/tracking/sled) off

· [RPT/ENT] key on the remote commander

Tracking gain up mode

· [PLAYMODE] key on the remote commander

[HOLD] switch is off:

Spindle speed becomes 1.65/2.0/2.65/3.5 times each time the

key is pressed

Tracking/spindle servo on

· [SOUND] key on the remote commander

Servo gain adjustment

Tracking servo off

· [DISPLAY] key on the remote commander

On/off switching of the DOUT LED (AEP, UK and East Euro-

pean models) and error rate display

· [VOL +] / [VOL --] keys on the set or remote commander

2-step volume setting

SERVICE MODE

In the Service mode, this set can check the following.

Note: Use RM-MC10L (Part No. 1-476-211-[][]), when you operate service

mode. (Use dot matrix Remote Commander)

1. Service Mode Setting Method

To set the service mode, perform as follows.

1) Make sure that the power is not turned on.

2) Check for the following states:

CD lid open detection switch (S801) .... OFF

Solder bridge at TAP802 (OPEN) ......... OPEN

[HOLD] switch (S803) .......................... OFF

[AVLS] switch (S808) ........................... OFF

[G-PROTECTION] switch (S802) ........ ON

3) Short the solder bridge at the TAP801 (TEST) on the MAIN

board (see Fig. 2).

4) Turn the power on, and then set a CD.

2. Operation in Service Mode

When the Service mode is set, the LCD on the remote commander

displays the microcomputer version display.

Remote commander LCD display

MAIN Board (Component Side)

Fig. 2

Service mode

All lit

888

Microcomputer

version display

VA020

DDDD

BASS12

0000

Remote Commander LCD display

(play mode)

Remote Commander LCD display

(For the rest, turn the power off and then turn it on again)

Up0000

Remote Commander LCD display

(1.65 times)

010001

(3.5 times)

040004

(For the rest, turn the power off and then turn it on again)

D-EJ785

0000

Remote Commander LCD display

010001

Remote Commander LCD display

****

value

0000 to 0099

: OK

more than 0100 : NG

Er****

4. Service Mode Releasing Method

To release the service mode, perform as follows.

1) Turn the power off.

2) Open the solder bridge at the TAP801 (TEST) on the MAIN

board.

Note: Remove the solder completely.

5. Error Rate Check Display

The C1 error rate check display mode becomes active if the fol-

lowing operation is performed during the operation in the service

mode.

1) Turn the power off, and cancel other service operations.

2) Turn the power on, and then set a CD and play it with

the X key on the remote commander.

3) Press the [SOUND] button on the remote commander to make

automatic adjustment.

4) Press the [PLAYMODE] button on the remote commander.

5) Press the [DISPLAY] key on the remote commander, and the

C1 error rate display will be activated and the LCD on the

remote commander will display as follows.

Note: In the play state, press the [SOUND] key on the remote commander

before pressing the [PLAYMODE] key. Wrong order of button op-

erations will result in very large Er**** value.

6) Turn the power off.

7) Open the solder bridges at the TAP801 (TEST) on the MAIN

board.

Note: Remove the solder completely.