Sony DE-777 Service manual

D-E777/EJ721/EJ725

SERVICE MANUAL

Ver 1.0 2001.01

Photo : D-EJ725

SPECIFICATIONS

US Model

D-EJ721/EJ725

Canadian Model

AEP Model

UK Model

E Model

Australian Model

Chinese Model

D-EJ725

Tourist Model

D-E777

Model Name Using Similar Mechanism D-EJ621 CD Mechanism Type CDM-3123EBA Optical Pick-up Type DAX-23E

System

Compact disc digital audio system

Laser diode properties

Material: GaAIAs Wavelength : λ= 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. )

D-A conversion

1-bit quartz time-axis control

Frequency response

20 - 20,000 Hz+1 dB (measured by EIAJ CP-

307)

Output (at 4.5 V input level)

Line output (stereo minijack)

Output level 0.7 V rms at 47 kΩ Recommended load impedance over 10 kΩ

Headphones (stereo minijack)

Approx. 5 mW + Approx. 5 mW at 16 Ω (Approx. 1 mW + Approx. 1 mW at 16 Ω)* *For the customers in France

Optical digital output (optical output connector)

Output level: –21 - –15 dBm Wavelength: 630 - 690 nm at peak level

–2

Power requirements

For the area code of the model you purchased, check the upper left side of the bar code on the package.

• Two Sony NC-WMAA rechargeable batteries: 2.4 V DC,

• 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): US, Canadian, MX model: 120 V, 60 Hz AEP, FR, EE, G, E13 model: 220 - 230 V, 50/60 Hz UK model: 230 - 240 V, 50 Hz AUS model: 240 V, 50 Hz JEW, E33 model: 100 - 240 V, 50/60 Hz HK model: 220 V, 50/60 Hz CH model: 220 V, 50 Hz

• Sony DCC-E345 car battery cord for use on car battery : 4.5V DC

Battery life* (approx. hours)

(When you use the CD player on a flat and

stable surface.)

Playing time varies depending on how the CD

player is used.

When using G-PROTECTION function

on off

Tow NC-WMAA 10 8 (charged for about 3 hours**) NH-WM2AA 22 20 (charged for about 5 hours**) Two Sony alkaline batteries 38 34 LR6 (SG) Four Sony alkaline batteries 86 76 LR6 (SG) Two rechargeable batteries 50 44 NC-WMAA and two Sony alkaline batteries LR6 (SG) Rechargeable batteries 64 54 NH-WM2AA and two Sony alkaline batteries LR6 (SG)

* Measured value by the standard of EIAJ

(Electronic Industries Association of Japan).

** Charging time varies depending on how the

rechargeable battery is used.

– Continued on page 2 –

9-873-052-11

PORTABLE CD PLAYER

Sony Corporation

Audio Entertainment Group General Engineering Dept.

D-E777/EJ721/EJ725

Operating temperature

5°C - 35°C (41°F - 95°F)

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

Approx. 131.6 x 25.5 x 140.9 mm (51/4 x 11/16 x 55/8 in.)

Mass (excluding accessories)

Approx. 193 g (6.9 oz)

Supplied accessories

For the area code of the location in which you purchased the CD player, check the upper left side of the bar code on the package.

AC power adaptor (1) Headphones/earphones with remote control (1) Rechargeable batteries (2) Battery carrying case (1) Carrying pouch (1)* External battery case (1) AC plug adaptor (1)*

*1Not supplied with Canadian, AEP, G, UK,

FR and EE models

*2Supplied with JEW and E33 models

Design and specifications are subject to change without notice.

TABLE OF CONTENTS

Specifications ............................................................................ 1

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

2. GENERAL

Locating the Controls......................................................... 4

3. DISASSEMBLY

3-1. Cabinet (Rear), Cabinet (Front).................................. 6

3-2. MD ASSY, Main board ............................................... 6

3-3. “Motor ASSY, Turn Table (Spindle) (M901)”............ 7

3-4. “Motor ASSY (Sled) (M902)”,

Optical Pick-up (DAX-23E) ...................................... 7

3-5. “Lid, Upper”, Switch Unit .......................................... 7

4. ELECTRICAL ADJUSTMENTS ............................. 8

5. DIAGRAMS

5-1. Explanation of IC Terminals....................................... 9

5-2. Block Diagram...........................................................11

5-3. Printed Wiring Boards – Main Section (Side A) – ... 12 5-4. Printed Wiring Boards – Main Section (Side B) – ... 13

5-5. Schematic Diagram – Main Section (1/2) – ............. 14

5-6. Schematic Diagram – Main Section (2/2) – ............. 15

• Abbreviation AUS : Australian FR : French HK : Hong Kong G : German JEW : Tourist CH : Chinese EE : East European KR : Korean E13 : AC220-230V area model E33 : AC100-240V area model

DANGER

Invisible laser radiation when open and interlock failed or defeated. Avoid direct exposure to beam.

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.

6. EXPLODED VIEWS

6-1. Cabinet Section......................................................... 18

6-2. Optical pick-up Section (CDM-3123EBA) .............. 20

7. ELECTRICAL PAR TS LIST................................... 21

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 SHO WN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

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

SECTION 1

SERVICING NOTES

D-E777/EJ721/EJ725

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

The laser diode in the optical pick-up block may suffer electrostatic 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 emission, observe from more than 30cm away from the objective lens.

Before Replacing the Optical pick-up Block

Please be sure to check thoroughly the parameters as per the “Optical pick-up Block Checking Procedure” (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 eg pin When checking FOK, remove the lead wire to disc motor.

• RF signal P-to-P value : 0.45 to 0.65Vp-p (D-E777/EJ725)

: 0.38 to 0.6Vp-p (D-EJ721)

Laser Diode Checking Methods

During normal operation of the equipment, emission of the laser diode is prohibited unless the upper panel is closed while turning ON the S801 (push switch type). The following checking method for the laser diode are operable.

Method : Emission of the laser diode is visually checked.

1. Open the upper lid.

2. Push the S801 as shown in Fig. 1.

3. Check the object lens for confirming normal emission of the laser diode. If not emitting, there is a trouble in the automatic power control circuit or the optical pick-up. During normal operation, the laser diode is turned ON about 2.5 seconds for focus searching.

S801

Fig.1 Method to push S801

D-E777/EJ721/EJ725

LOCA TING THE CONTROLS

CD player (front)

SECTION 2

GENERAL

This section is extracted from instruction manual.

1 Display

2 REPEAT/ENTER button

3 PLAY MODE

button

4 SOUND button

5 HOLD switch

6 OPEN switch

7 VOLUME +/–

buttons

8 ./>

(AMS/search) buttons

9 u (play/pause)

button

q; x (stop)/CHG

(charge) button

qa EXT BATT

(external battery)/ DC IN 4.5 V (external power input) jack

qs LINE OUT

(OPTICAL) jack

qd i (headphones) jack

CD player (inside)

qf G-PROTECTION

switch

CD player (rear)

qg AVLS switch

qh Battery compartment

D-E777/EJ721/EJ725

Remote control (for the models supplied with the RM-CD15L/CD16EL remote control)

qj Display

qk HOLD switch

ql x (stop) button

w; VOL (volume) +/–

buttons

wa N >

(play•AMS/search) buttons

ws . (AMS/search) buttons

Clip (rear)

D-E777/EJ721/EJ725

SECTION 3

DISASSEMBLY

The equipment can be removed using the following procedure.

“Motor ASSY, Turn table (Spindle) (M901)”

Cabinet (rear) MD ASSY, Main board

Set

Cabinet (front)

“Lid, upper”, Switch unit

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

3-1. CABINET (REAR), CABINET (FRONT)

“Motor ASSY (Sled) (M902)”, Optical pick-up (DAX-23E)

Cabinet (front)

Switch unit flexible boar

Claw

3-2. MD ASSY, MAIN BOARD

Optical pick-up

flexible board

Screw (2x8)

Claws

Cabinet (rear)

Screw (2x8)

MD ASSY

Claw

CN503 (white)

CN502 (green)

Cabinet (rear)

Main board

D-E777/EJ721/EJ725

3-3. “MO TOR ASSY , TURN T ABLE (SPINDLE) (M901)”

1 Screws (B1.7x5)

Motor ASSY, Turn tabl (Spindle) (M901)

Chassis

3-4. “MOTOR ASSY (SLED) (M902)”, OPTICAL PICK-UP (DAX-23E)

1 Screw (B 1.7x5)

Cover, Gear

Screw ASSY, Feed

Chassis

Gear B

Motor ASSY (Sled) (M902)

4 Screw (P 1.4x3.5)

Retainer, shaft

Optical pick-up (DAX-23E)

3-5. “LID, UPPER”, SWITCH UNIT

Lid, upper

Switch unit

Cover, lid

Claws

OPEN

Cabinet (front)

Screws

D-E777/EJ721/EJ725

D461

SECTION 4

ELECTRICAL ADJUSTMENTS

The CD section adjustments are done automatically in this set.

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 : DC4.5 V in DC IN jack.

(J401) VOLUME button : Minimum AVLS switch : NORM HOLD switch : OFF

Focus bias Check

Condition:

• Hold the set in horizontal state.

Connection:

oscilloscope

(AC range)

2 K

Ω

TP635 (GND)

[ MAIN BOARD] (Side B)

EXCEPT US MODEL

R656

IC604

C645

TP635 (GND)

EXCEPT US MODEL

TP419

R625

R647

1620

IC603

D603

R657

R649

C625

C646

D602

C636

TP922

C635

C634

EXCEPT

TP504

R635

R652

C620

C623

C622

C632

R655

TP501

R653

R624

R654

C614

C626

C628

FB603

R104

620

TP637 TP638

FB602

TP920

TP503

TP502

TP912

C613

619

TP641

TP403

TP629 (RF)

TAP403

Q501

C501

R615

R506

R616

C615

R504

C506

R617

C605

TP302

C631

C630

C462

TP631

C502

C504

C505

R509

916

R505

C507

TAP602

TP417

TP629 (RF)

IC501

C461

TP632

TP630

C624

TP633

R463

TP9

C609

Procedure:

1. Connect the oscilloscope to the test points TP629 (RF) and TP635 (GND) on the MAIN 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 : 500ns

RF level

0.45 to 0.65 Vp-p (D-E777/EJ725)

0.38 to 0.6 Vp-p (D-EJ721)

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.

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