Sony DEJ-620 Service manual

D-E666/EJ620/EJ621/EJ622/

EJ623/EJ625/EJ626CK

SERVICE MANUAL

Ver 1.4 2001.11
with SUPPLEMENT-1
(9-873-048-81)

Photo : D-EJ620

US Model

D-EJ621/EJ622/EJ625/EJ626CK

Canadian Model

UK Model

E Model

Australian Model

D-EJ621/EJ625/EJ626CK

AEP Model

D-EJ620/EJ621/EJ623/EJ625/EJ626CK

Chinese Model

D-EJ621/EJ625

Tourist Model

D-E666

Model Name Using Similar Mechanism D-EJ711

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 kilohms
Recommended load impedance over 10
kilohms

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

-2

SPECIFICATIONS

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, C&SA, MX model:
120 V, 60 Hz
AEP, FR, G, EE, E13, G model:
220 - 230 V, 50/60 Hz
UK, 3AEP7 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
AR, 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 21 18
(charged for about 5 hours**)
Two Sony alkaline batteries 36 32
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.

Operating temperature

5°C - 35°C (41°F - 95°F)

– Continued on page 2 –

9-873-048-15

2001K0200-1

© 2001.11

PORTABLE CD PLAYER

Sony Corporation

Personal Audio Company

Published by Sony Engineering Corporation

D-E666/EJ620/EJ621/EJ622/EJ623/EJ625/EJ626CK

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

Approx. 131.6 x 29.5 x 135.5 mm
( 51/4 x 13/16 x 53/8 in.)

Mass (excluding accessories)

Approx. 191 g (6.8 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.

D-EJ621/EJ622

D-EJ620

AC power adaptor (1) –
Headphones/earphones –a*

with remote control (1)
Headphones/

earphones (1)
Rechargeable ––

batteries (2)
Battery carrying case (1) ––
AC plug adaptor (1)
Hand strap (1)

*1Supplied with AR and MX models

2

*

Not supplied with AR and MX models

3

*

Supplied with E33 and JEW models

4

Supplied with AEP, G, UK, FR and EE

*

models

D-EJ626CK
AC power adaptor (1)
Headphones/earphones (1)
Rotary commander (1)*
Rotary commander mounting kit (1)*
Car battery cord (1)
Car connecting pack (1)
Velcro tape (2)
Spiral tube (1)
AC plug adaptor (1)*
Hand strap (1)*

3

aa

–––

aa

1

2

D-E666/EJ625

D-EJ623

aaa

1

–

2

*

a

aa

aa

4

*

aa

1

TABLE OF CONTENTS

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

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

2. GENERAL

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

3. DISASSEMBLY

3-1. Cabinet (Rear) Sub ASSY,

Cabinet (Front), Main Board....................................... 6

3-2. MD ASSY................................................................... 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

a

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

3

a

*

4

*

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

6. EXPLODED VIEWS

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

6-2. Optical pick-up Section (CDM-3123EBA) .............. 21

7. ELECTRICAL PARTS LIST ................................... 22

*1Supplied with Canadian, AEP, UK and G models
*2Supplied with E33 model
*3Supplied with AEP, UK and G models

Design and specifications are subject to change without notice.

• Abbreviation
AUS : Australian
FR : French HK : Hong Kong
AR : Argentina JEW : Tourist
G : German EE : East European
CH : Chinese
C&SA : Central and South America
E13 : AC220-230V area model
E33 : AC100-240V area model
3AEP7: UK

2

D-E666/EJ620/EJ621/EJ622/EJ623/EJ625/EJ626CK

S801

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 dam-

aged by heat.

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
P ART NUMBERS APPEAR AS SHOWN 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

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 : 0.4 to 0.65Vp-p (Except US model)

: 0.35 to 0.65Vp-p (US model)

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 two checking methods 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.

Fig.1 Method to push S801

3

D-E666/EJ620/EJ621/EJ622/EJ623/EJ625/EJ626CK

SECTION 2

GENERAL

LOCA TING THE CONTROLS

CD player (front)

This section is extracted from
instruction manual.

1 Display

2 PLAY MODE

button

3 ./>

(AMS/search)
buttons

4 LINE OUT

5 HOLD switch

6 VOLUME +/–

buttons

7 u (play/pause)

button

8 DC IN 4.5 V (external

power input) jack

Strap holes

9

q; x (stop)/CHG (charge)

button

qa SOUND button

qs REPEAT/ENTER

button

qd i (headphones) jack

qf OPEN switch

CD player (inside)

qg G-PROTECTION

switch

4

CD player (rear)

D-E666/EJ620/EJ621/EJ622/EJ623/EJ625/EJ626CK

qh AVLS switch

qj Battery

compartment

Remote control

qk x (stop) button

ql VOL (volume)

+/– button

(for the models supplied with the remote control)

w; N(play)•>

(AMS/search) button

wa HOLD switch

ws .(AMS/search)

button

5

D-E666/EJ620/EJ621/EJ622/EJ623/EJ625/EJ626CK

d

SECTION 3

DISASSEMBLY

z

The equipment can be removed using the following procedure.

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

Cabinet (rear) sub ASSY, Main board MD ASSY

Set

Cabinet (front)

“Lid, Upper”, Switch unit

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

3-1. CABINET (REAR) SUB ASSY, CABINET (FRONT), MAIN BOARD

3

Screws (B2 2x6)

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

Lid ASSY (upper)

Cabinet (front)

3-2. MD ASSY

2

OPEN

MD ASSY

Cabinet (rear) sub ASSY

4

Claws

3

Optical pick-up

flexible board

7

1

Screws (B2 2x6)

5

6

4

Claws

4

MD ASSY

Flexible board (CN801)

Main board

Claws

2

CN503 (White)

1

CN502 (Green)

Main boar

6

D-E666/EJ620/EJ621/EJ622/EJ623/EJ625/EJ626CK

e

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

1 Screws
(B1.7x5)

Motor ASSY, Turn tabl
(Spindle) (M901)

2

Chassis

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

1 Screw (B 1.7x5)

Cover, Gear

Screw ASSY, Feed

2

5

Chassis

Gear B

3

Motor ASSY (Sled) (M902)

4 Screw
(P 1.4x3.5)

Retainer, shaft

Optical pick-up
(DAX-23E)

6

3-5. “LID, UPPER”, SWITCH UNIT

0

Button (mode)

9

Button (FF and REW)

8

Switch unit

7

Cover, lid

6

Claws

5

Screws

6

Claw

4

6

Claws

Lid ASSY (upper)

!¡

6

Claw

Button (play)

1

Shaft lock

3

Spring (full open)

Cabinet (front)

2

7

D-E666/EJ620/EJ621/EJ622/EJ623/EJ625/EJ626CK

)

3

0

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)

[ MAIN BOARD] (Side B)

C635

C632

P650

120

1

5

10

15

20

35

30

31

601

C621

2

TP441

C622

XCEPT

S MODEL

8

115

35

C610

TP410

TP426

R2

110

IC601

40

R601

R1

R408

105

45

R600

C625

R506
C505

C629

95

100

80

65

55

50

60

R632

R611

C627

C616

R612

C623

C626

13

16

C504

C506

US MODEL

2 K

91

85

75

70

61

C611

IC500

Ω

TP431 (GND)

R622

90

TP640
TP639
TP638

C609

R606

R603

R602

R504

C612

R500

R503

R650

C503

R502

TP431

TP629 (RF)

L6

C6

C628

C608

C605

R610

R605

R604

C602

R657

R614

C613

R616

R613

R617

89

R615

5

1

GND

L201

C601

C607

R609

C603

R607

EXCEPT
US MODEL

C614

Q405

TP416

TP818

C606
R608

D302

C604

L301

TP301

C615

R619

C407

L101

R412

D102

TP201

D202

D203

Procedure:

1. Connect the oscilloscope to the test points TP629 (RF) and TP431
(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

0.4 to 0.65 Vp-p (Except US model

0.35 to 0.65 Vp-p (US model)

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.

8

D-E666/EJ620/EJ621/EJ622/EJ623/EJ625/EJ626CK

SECTION 5

DIAGRAMS

5-1. EXPLANATION OF IC TERMINALS

IC801 (SYSTEM CONTROLLER) T5U87-05 (E666/EJ625: E13, HK, KR, CH, AUS),
TMP88CM22F-MIRX-1 (EJ620/EJ621/EJ622/EJ623/EJ625: US, CND, AEP, UK, G, FR, EE/EJ626CK)

Pin No. Pin name I/O Description

1 VSS — Ground terminal.
2 IRRMCO — Not used (OPEN).
3 FOKI I Focus OK signal input from the digital servo processor (IC601). “L”: NG, “H”: OK
4 AGCPWM O AGC control pulse signal output terminal.
5 RESERVE — Not used (OPEN).
6 RESERVE — Not used (OPEN).
7 AMUTE O Analog audio muting ON/OFF control signal output terminal. “H”: muting ON
8 VCC2 ON O VCC2 voltage control signal output terminal.

9 XRST O Reset signal output to IC601. “L”: reset
10 SCK O Serial data transfer clock signal output to IC601.
11 MSDTI I Serial data input from the IC601.
12 MSDTO O Serial data output to IC601.
13 WAKE UP O WAKE-UP control signal output terminal (for system standby reset).
14 SEL I Plug-in detection signal input terminal of LINE OUT/OPTICAL OUT.
15 CHGMNT I Battery charge voltage detection input from the power control (IC401).
16 KEY2 I Volume key input terminal.
17 BATMNT I Battery voltage detection signal input terminal
18 KEY1 I Key input terminal.
19 RMKEY I Key input from the headphone with remote commander (A/D input).

20 DCINMNT I

21 OPEN I

22 VREFL I Reference voltage input terminal (0V) for A/D converter.
23 VREFH I Reference voltage input terminal (+2V) for A/D converter.
24 VDD — Power supply terminal (+2V).
25 SCOR I Sub-code sync (S0+S1) detection signal input from the IC601.
26 GRSCOR I GRSCOR signal input from the IC601.
27 MIR I FG pulse signal input.
28 BEEP O Beep sound output to the headphone amplifier (IC302).
29 RESERVE — Not used ( Fixed at “H”).
30 RESERVE — Not used ( Fixed at “H”).
31 RESERVE I Not used ( Fixed at “H”).
32 TSB O Communication data bus output of headphone with remote commander.
33 TXTSKIP — Not used (OPEN).
34 XDIG VOL — Not used (OPEN).
35 CD RW — Not used (OPEN).
36 COMPRESSION I G PROTECTION switch input.
37 DIG TU — Not used (Fixed at “H”).

38 AVLS I

39 HOLD I HOLD switch (S803) input terminal. “L”: hold ON, “H”: hold OFF
40 EXBAT I External battery detection signal input terminal.

DC input voltage detection input terminal (A/D input) and DC input jack use/no use
detection input terminal.
CD door open/close detection switch (S801) input terminal.
The stop status is reset with the falling edge of input signal.

AVLS (Automatic Volume Limiter System) switch (S803) input terminal.
“L”: normal mode, “H”: limit mode

9

D-E666/EJ620/EJ621/EJ622/EJ623/EJ625/EJ626CK

Pin No. Pin name I/O Description

41 BATDET I Battery detection input.
42 XHGOM O Optical pick-up power ON/OFF control signal output terminal. “L”: ON
43 XLAT O Serial data latch pulse signal output to IC601.
44 XSOE O Serial data output enable signal output terminal.
45 RESERVE — Not used ( Fixed at “H”).
46 XPOWLT O Latch signal output to the power control (IC401).
47 RESERVE — Not used (Fixed at “H”).
48 XAPC OFF O APC mute signal output terminal. “L”: mute

49 SEG15 — Not used (open).
50 to 64 SEG14 to SEG0 O Segment drive signal output to the liquid crystal display.
65 to 68 COM3 to COM0 O Common drive signal output to the liquid crystal display.
69 to 71 V3 to V1 O Bias signal output to the liquid crystal display driver.

72, 73 C1, C0 O Capacitor connected terminal for the liquid crystal display driver voltage-up.

74 STOP O VCD control stop signal output terminal. Not used (Fixed at “L”).

75 TEST I Test terminal for IC (Fixed at “L”).

76 XVCC2SD O VCC2 voltage control signal output terminal.

77 XLED O LCD back light control signal output to the liquid crystal display. (EJ616CK)

System reset signal input from the power control (IC401). “L”: reset

78 RESET I For several hundreds msec. after the power supply rises, “L” is input, then it changes to

“H”
79 XIN I System clock input terminal.
80 XOUT — Not used (OPEN).

10