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SERVICE MANUAL
PORTABLE CD PLAYER
D-EQ550
Ver 1.0 2002.02
US Model
Canadian Model
AEP Model
E Model
Model Name Using Similar Mechanism
D-E350
MD Mechanism Type
CDM-3125ER
Optical Pick-up Mechanism Type
DAX-25E
9-873-599-01
Sony Corporation
2002B0500-1
Personal Audio Company
C
2002.02
Published by Sony Engineering Corporation
SPECIFICATIONS
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.)
Error correction
Sony Super Strategy Cross Interleave Reed
Solomon Code
D-A conversion
1-bit quartz time-axis control
Frequency response
20 - 20 000 Hz
dB (measured by JEITA CP-307)
Output (at 4.5 V input level)
Headphones (stereo minijack)
Approx. 10 mW + approx. 10 mW at 16
(Approx. 1 mW + approx. 1 mW at 16
*)
* 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 LR6 (size AA) batteries: 3 V DC
· AC power adaptor (DC IN 4.5 V jack):
US, CND models: 120 V, 60 Hz
AEP, FR, EE, E models: 220 ­ 230 V, 50/60 Hz
Dimensions (w/h/d) (without projecting parts and controls)
Approx. 130.6
× 29.8 × 150.5 mm
(5 1 /4
× 1 3 /16 × 6 in.)
Mass (excluding accessories)
Approx. 210 g (7.5 oz)
Operating temperature
5
°C ­ 35°C (41°F ­ 95°F)
Supplied accessories
For the area code of the model you purchased, check the upper left
side of the bar code on the package.
Headphones (1)
Lid cover (1)
Headphones caps (1 pair)
Design and specifications are subject to change without notice.
· Abbreviation
CND : Canadian model
EE
: East European model
FR
: French model
+1
­5


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2
D-EQ550
On the AC power adaptor
· Use only the supplied AC power adaptor. If your player is not
supplied with it, use AC-E45HG AC power adaptor. Do not use
any other AC power adaptor.
DANGER
Invisible laser radiation when open and interlock failed or defeated.
Avoid direct exposure to beam.
1.
SERVICING NOTES ................................................ 3
2.
GENERAL
Locating the Controls ......................................................
3
3.
DISASSEMBLY
3-1. Disassembly Flow ...........................................................
4
3-2. Cabinet (Lower), MD ASSY ..........................................
4
3-3. Main Board ......................................................................
5
3-4. Turn Table Motor ASSY (Spindle) (M901) ...................
5
3-5. Optical Pick-up (DAX-25E) ...........................................
6
4.
ELECTRICAL ADJUSTMENTS .......................... 7
5.
DIAGRAMS
5-1. Block Diagram ................................................................
8
5-2. Note for Printed Wiring Board and
Schematic Diagrams .......................................................
9
5-3. Printed Wiring Board ...................................................... 10
5-4. Schematic Diagram ­ MAIN Section (1/3) ­ ................ 11
5-5. Schematic Diagram ­ MAIN Section (2/3) ­ ................ 12
5-6. Schematic Diagram ­ MAIN Section (3/3) ­ ................ 13
5-7. IC Pin Function Description ........................................... 14
6.
EXPLODED VIEWS
6-1. Cabinet Section ............................................................... 16
6-2. Optical Pick-up Section (CDM-3125ER) ....................... 17
7.
ELECTRICAL PARTS LIST .................................. 18
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 COMPOSANTS QUE PAR DES PIÈCES
SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL
OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
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 PUBLISHED BY SONY.
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.
TABLE OF CONTENTS
This Compact Disc player is
classified as a CLASS 1 LASER
product.
The CLASS 1 LASER
PRODUCT label is located on
the rear exterior.
Laser component in this product is capable of emitting
radiation exceeding the limit for Class 1.
Polarity of the plug
CAUTION
Use of controls or adjustments or performance of procedures other
than those specified herein may result in hazardous radiation
exposure.


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3
D-EQ550
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 yg pin
When checking FOK, remove the lead wire to disc motor.
· RF signal P-to-P value : 0.45 to 0.65Vp-p
Combination of Cover Plate Accessories
Set
Accessories
ORANGE (DOT)
BLUE (BUTTERFLY)
BLUE (JEWELRY)
PINK (HEART)
SECTION 1
SERVICING NOTES
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.
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR
BASE UNIT
Fig.1 Method to push S801
S801
SECTION 2
GENERAL
LOCATING THE CONTROLS
HOLD .
i
VOL
­
VOL
+ SOUND
ESP
OPEN
DISPLAY
DC IN 4.5V
.
x
>B
MENU


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4
D-EQ550
SECTION 3
DISASSEMBLY
SET
3-2. CABINET (LOWER),
MD ASSY
(Page 4)
3-4. TURN TABLE MOTOR
ASSY (SPINDLE) (M901)
(Page 5)
3-5. OPTICAL PICK-UP
(DAX-25E)
(Page 6)
3-3. MAIN BOARD
(Page 5)
· This set can be disassembled in the order shown below.
3-1.
DISASSEMBLY FLOW
Note: Follow the disassembly procedure in the numerical order given.
3-2.
CABINET (LOWER), MD ASSY
5
Claw
cabinet (lower)
cabinet (front)
MD assy
6
q;
lid upper
1
5
two claws
5
claws
7
flexible board (CN501)
8
connector (CN503) (white)
9
connector (CN502) (black)
5
two claws
3
Open the battery lid.
4
two screws (B2 x 10)
2
three screws (B2 x 10)


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D-EQ550
3-3.
MAIN BOARD
3-4.
TURN TABLE MOTOR ASSY
(SPINDLE) (M901)
main board
cabinet (lower)
1
2
turn table motor assy
(spindle) (M901)
1
three screws
(B1.7
× 5)
Chassis