Sony d ej 755 service manual

Page 1

D-EJ750 EJ751 EJ753 EJ755 EJ7560K EJ7580K

SERVICE MANUAL

Ver 1.0 2002.02

US Model

D-EJ756CK/EJ75BCK
Canadian Model
UK Model

D-EJ751/EJ755/EJ7580K

AEP Model

D-EJ750/EJ751/EJ753/EJ755/EJ75BCK
Australian Model
E Model

D-EJ751/EJ758CK

Chinese Model

System
Compact disc digital audio system
Laser diode properties
Material: GaAlAs
Wavelength : 7t : 780 nm
Emission duration : Continuous
Laser olttput : Less than 44.6 uW
(This output is the value measured at a distance
of 200 mm from the objective lens surface on
the optical pickeup block with 7 mm aperture.)
D-A conversion
l-bit quarts time7axis control
Frequency response
20 - 20 000 Hz :1 dB (measured by JEITA CPA307)
Output (at 4.5 V input level)
Line output (stereo minijack)
Output level 0.7 V rms at 47 k
Recommended load impedance over 10 k
Headphones (stereo minijack)
Applox.5 mW + Approx. 5 mW at 16 Q
(Approx. 0.5 mW + Approx. 0.5 mW at 16 Q)*
*For the customers in France
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 NC7WMAA rechargeable
batteries: 2.4 V DC
- Sony NH-WMZAA rechargeable batteries:
2.4 V DC
' Two LR6 (size AA) batted " "I V DC
- AC power adaptor (DC IN 4.5 V jack):
US, CND, CELSA, MX model: 120 V, 60 Hz
AER FR: G. EE, E13 mode : 220 7 230 V7 50/60 Hz
UK model: 230 7 240 V. 50 Hz
AUS model: 240 V. 50 Hz
CH model: 220 V, 50 H2

9-873-580-01 Sony Corporation
2002802004 Personal Audio Company
© 2002.02

Pubulished by Sony Engineering Corporation

D-EJ751
Photo : D-EJ755
Model Name Using Similar Mechanism D-E350
CD Mechanism Type CDM-3125EFI
Optical Pick-up Type BAX-25E

SPECIFICATIONS

Battery life" (approx. hours)

(When you use the CD player on a flat and stable sur7
face.)

Playing time varies depending on how the CD player is
used.

G-PROTECTION function
on off

Two NC7WMAA 12 10

(charged for

about 3 hours)

NH-WMZAA 25 22

(charged for

about 5 hours)

Two Sony alkaline 48 38

batteries LR6(SG)

(produced in Japan)

When using

* Measured value by the standard of JEITA (Japan
Electronics and Information Technology
lndustriesAssoeiaIion).

** Charging time Varies depending on how the
rechargeable battery is used.

Operating temperature
5°C - 35"C (41°F , 95°F)

Dimensions (w/h/d) (excluding projecting

parts and controls)

Approx. 135.5 x 29.2 X 137.4 mm
(5 /r><1/n,><5 I/zln.)

Mass (excluding accessories)

Approx. 185 g (6.6 02.)

Design and specifications are subject to change
without notice.

Accessories

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.

. C? Q \Q
2 =2. e a
a a s (a
ACpoweradaptor(1) 7 O O O
Headphones/earphones 7 0*] O
with remote control (1)
Headphones/ O O"2 O 7
earphones (1)
Rechargeable 7 7 O 0
batteries (2)
Batterycttrryingcasefl) 7 7 O O

* 1 Supplied with MX models

* 2 Not supplied with MX models
D-EJ756CK/EJ758CK

AC power adaptor (l)
Headphones/earphones (1)
Rotary commander (1)

Car battery cord (1)

Car connecting pack (1)

Velcro tape for the CD player (4)
Velcro tape for the rotary commander (2)
Hand strap (1)

PORTABLE co PLAYER
S 0 NY;

Page 2

D-EJ750/EJ751/EJ753/EJ755/EJ756CK/EJ758CK

- Abbreviation
AUS : Australian
FR : French
EE : East European
CND : Canadian
CH : Chinese
MX : Mexico
C&SA : Central and South America
E13 : AC220-23OV 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.

Laser component in this product is capable of emitting
radiation exceeding the limit for CI' s l.

This Compact Disc player is
classified as a CLASS 1 LASER
product.

The CLASS I LASER
PRODUCT label is located on
the rear exterior.

CLASS 1 LASER PRODUCT
LUOKAN 1 LASERLAITE

KLASS 1 LASERAPPARAT

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 damA
aged by heat.

TABLE OF CONTENTS
Specifications ............................................................................ 1
1. SERVICING NOTES ................................................... 3
2. GENERAL
Locating the Controls ......................................................... 3

3. DISASSEMBLY
3»l. Upper Lid Sub ASSY, Cabinet (Front) Sub ASSY ..... 4
32. MD ASSY, Main Board ................................. 5
373. Motor ASSY, Turn Table (Spindle) (M901) 5
374. Motor ASSY (Sled) (M902),

Optical Pickiup (DAX-ZSE) ...................................... 6
4. ELECTRICAL ADJUSTMENS ............................... 7
5. DIAGRAMS

5»l. Explanation of IC Terminals
572. Block Diagram ......
53. Printed Wiring Board
5-4. Schematic Diagram iMAIN SECTION (1/3)7
55. Schematic Diagram iMAIN SECTION (2/3)7
56. Schematic Diagram iMAIN SECTION (3/3}

6. EXPLODED VIEWS
6*]. Upper Lid Section.
62. Cabinet Section ..
673. Optical pick»up Section (CDM73125ER)

7. ELECTRICAL PARTS LIST

SAFETY-RELATED COMPONENT WARNING !!

COMPONENTS IDENTIFIED BY MARK A 0R DOTTED LINE
WITH MARK A ON THE SCHEMATIC DIAGRAMS AND IN THE
PARTS LIST ARE CRITICALTO SAFE OPERATION.

REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY.

ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!

LES COMPOSANTS IDENTIFIES PAR UNE MAROUE A SUR LES
DIAGRAMMES SCHEMATIQUES ET LA LISTE DES PIECES
SONT CRITIQUES POUR LA SECURITE DE FONCTIONNEMENT.
NE REMPLACER CES COMPOSANTS QUE PAR DES PIECES
SONY DONT LES NUMEROS SONT DONNES DANS CE MANUEL
0U DANS LES SUPPLEMENTS PUBLIES PAR SONY.