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SERVICE MANUAL
Ver 1.1 2003.01
SPECIFICATIONS
PORTABLE CD PLAYER
D-EJ985
US Model
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
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.)
D-A conversion
1-bit quartz time-axis control
Frequency response
20 - 20 000 Hz
+1
­2 dB (measured by JEITA CP-
307)
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)
Approx. 5 mW + Approx. 5 mW at 16
Optical digital output (optical output connector)
Output level: ­21 - ­15 dBm
Wavelength: 630 - 690 nm at peak level
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 NH-14WM (A) rechargeable
batteries: 2.4 V DC
·Two LR6 (size AA) batteries: 3 V DC
·AC power adaptor (DC IN 4.5 V jack):
UK model: 230 - 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
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
"1"
"2"
Two NH-14WM (A)
43
44
(charged for
about 5 hours**)
External battery case
69
74
(two alkaline batteries***)
Two NH-14WM (A) and
113
120
external battery case
(two alkaline batteries***)
* 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.
*** When using Sony alkaline batteries LR6 (SG)
(produced in Japan)
Operating temperature
5
°C - 35°C (41°F - 95°F)
Dimensions (w/h/d) (excluding
projecting parts and controls)
Approx. 135.0
× 135.0 × 16.2 mm
(5 3/8
× 5 3/8 × 21/32 in.)
Mass (excluding accessories)
Approx. 174 g (6.2 oz)
Design and specifications are subject to change
without notice.
AC power adaptor (1)
Headphones/earphones with remote control (1)
Rechargeable batteries (2)
Charging stand (1)
Battery carrying case (2)
Carrying pouch (1)
External battery case (1)
AC plug adaptor (1)*
* Supplied with tourist model only
Supplied accessories
US, Canadian model: 120 V, 60 Hz
Australian model: 240 V, 50 Hz
9-874-204-02
Sony Corporation
2003A0500-1
Personal Audio Company
C
2003.01
Published by Sony Engineering Corporation


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2
D-EJ985
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.
TABLE OF CONTENTS
1.
SERVICING NOTES ............................................... 3
2.
GENERAL ................................................................... 6
3.
DISASSEMBLY
3-1. Disassembly Flow ...........................................................
7
3-2. Upper Lid (A) Sub Assy .................................................
7
3-3. Cabinet (Upper) Sub Assy ..............................................
8
3-4. Main Board, Optical Pick-up Section
(CDM-3325ER) ...............................................................
8
4.
ELECTRICAL CHECK .......................................... 9
5.
DIAGRAMS
5-1. Block Diagram ­ MAIN Section (1/2) ­ ....................... 10
5-2. Block Diagram ­ MAIN Section (2/2) ­ ....................... 11
5-3. Block Diagram ­ POWER Section ­ ............................. 12
5-4. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 13
5-5. Printed Wiring Board
­ Main Board (Component Side) ­ ................................ 14
5-6. Printed Wiring Board
­ Main Board (Conductor Side) ­ .................................. 15
5-7. Schematic Diagram ­ MAIN Board (1/3) ­ .................. 16
5-8. Schematic Diagram ­ MAIN Board (2/3) ­ .................. 17
5-9. Schematic Diagram ­ MAIN Board (3/3) ­ .................. 18
5-10. IC Pin Function Description ........................................... 20
6.
EXPLODED VIEWS
6-1. Upper Lid, Cabinet (Upper) Section .............................. 27
6-2. Cabinet (Lower) Section ................................................. 28
6-3. Optical Pick-up Section (CDM-3325ER) ....................... 29
7.
ELECTRICAL PARTS LIST ............................... 30
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
On AC poweradaptor
·Use only the AC power adaptor supplied or
recommended in "Accessories (supplied/
optional)." Do not use any other AC power
adaptor. It may cause a malfunction.
Polarity of the plug
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.
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.


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3
D-EJ985
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 S804. (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 S804 with a screwdriver having
a thin tip as shown in Fig.1.
3. Push the N X button.
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 4
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 S804
S804
detection lever
detection lever
MAIN board
About CD-Rs/CD-RWs
This CD player can play CD-Rs/CD-RWs recorded in the CD-DA
format*, but playback capability may vary depending on the qual-
ity of the disc and the condition of the recording device.
* CD-DA is the abbreviation for Compact Disc Digital Audio. It is
a recording standard used for the Audio CDs.


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4
D-EJ985
SERVICE MODE
In the Service mode, this set can check the following.
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 (S804) ....... OFF
Solder bridge at SL806 (OPEN) ............... OPEN
[AVLS] switch (S802) .............................. NORM
[HOLD] switch (S801) ............................. OFF
[G-PROTECTION] switch (S803) ........... 1
3) Short the solder bridge at the SL807 (TEST) on the MAIN
board (see Fig. 2).
4) Turn the power on.
2. Operation in Service Mode
When the Service mode is set, the LCD on the remote commander
displays the following.
Remote commander LCD display
3. Operation of Buttons and Knobs in Service Mode
The following operation can be checked by operating the buttons
and knobs on the set and remote commander.
3-1 . Case without Setting a CD
· N X button on the set and > N / . knobs on remote
commander
Optical pick-up movement (outward or inward)
Tracking/sled servo off
Note: Do not look directly at the laser beam from the optical pick-up.
Do not move forcibly the optical pick-up exceeding the most-out-
side or most-inside track.
3-2 . Case with Setting a CD
Cheking method:
1) Make sure that the power is not turned on.
2) Leave a solder bridge of the SL807 (TEST) on the MAIN board
shorted.
3) Turn the power on, and then set a CD and play it with the X
button on the remote commander.
·
x
button on the set and remote commander
All servos (focus/tracking/sled) off
· N X button on the set and > N / . knobs on remote
commander
Optical pick-up movement (outward or inward)
Tracking/sled servo off
· [PRT/ENT] button on remote commander
Tracking gain up mode
· [VOL +] / [VOL --] buttons on the set and [VOL +] / [VOL --]
knobs on remote commander
2-step volume setting
· [PLAYMODE] button on remote commander
CLV speed becomes 1 to 4 times each time the button is pressed
Tracking/sled servo on
Service mode
All lit
888
Microcomputer
version display
VB102
DDDD
BASS12
Fig. 2
SL807
(TEST)
SL806
(OPEN)
­ MAIN Board (Component Side) ­
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


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5
D-EJ985
· [SOUND] button on remote commander
Servo auto adjustment
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 SL807 (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 normal
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
button on the remote commander.
3) Press the [SOUND] button on the remote commander to make
automatic adjustment.
4) Press the [PLAY MODE] button on the remote commander.
5) Press the [DISPLAY] button 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] button on the remote com-
mander before pressing the [PLAY MODE] button. Wrong order of
button operations will result in very large Er**** value.
6) Turn the power off.
7) Open the solder bridges at the SL807 (TEST) on the MAIN
board.
Note: Remove the solder completely.
Remote Commander LCD display
(1 time)
010001
(4 times)
040004
(For the rest, turn the power off and then turn it on again)
0000
Remote Commander LCD display
Remote Commander LCD display
010001
Remote Commander LCD display
****
value
0000 to 0099
: OK
more than 0100 : NG
Er****