9-873-052-11
2001A0200-1
© 2001.1
Sony Corporation
Audio Entertainment Group
General Engineering Dept.
Ver 1.0 2001.01
SERVICE MANUAL
PORTABLE CD PLAYER
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
SPECIFICATIONS
System
Compact disc digital audio system
Laser diode properties
Material: GaAIAs
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 dB (measured by EIAJ CP-
307)
2
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
(Approx. 1 mW + Approx. 1 mW at 16
)*
*For the customers in France
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 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
Photo : D-EJ725
D-E777/EJ721/EJ725
2
D-E777/EJ721/EJ725
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
6. EXPLODED VIEWS
6-1. Cabinet Section ......................................................... 18
6-2. Optical pick-up Section (CDM-3123EBA) .............. 20
7. ELECTRICAL PARTS LIST ................................... 21
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
CAUTION
Use of controls or adjustments or performance of procedures other
than those specified herein may result in hazardous radiation
exposure.
DANGER
Invisible laser radiation when open and interlock failed or defeated.
Avoid direct exposure to beam.
· 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
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
(5 1/4 x 1 1/16 x 5 5/8 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)*1
External battery case (1)
AC plug adaptor (1)*2
*1 Not supplied with Canadian, AEP, G, UK,
FR and EE models
*2 Supplied with JEW and E33 models
Design and specifications are subject to change
without notice.
3
D-E777/EJ721/EJ725
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)
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 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.
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR
BASE UNIT
Fig.1 Method to push S801
S801
4
D-E777/EJ721/EJ725
SECTION 2
GENERAL
LOCATING THE CONTROLS
This section is extracted from
instruction manual.
CD player (front)
CD player (inside)
qd i (headphones) jack
qg AVLS switch
qh Battery compartment
1 Display
7 VOLUME +/
buttons
5 HOLD switch
3 PLAY MODE
button
6 OPEN switch
2 REPEAT/ENTER button
4 SOUND button
9
u (play/pause)
button
q;
x (stop)/CHG
(charge) button
CD player (rear)
8
./>
(AMS/search)
buttons
qf G-PROTECTION
switch
qs LINE OUT
(OPTICAL) jack
qa EXT BATT
(external battery)/
DC IN 4.5 V (external
power input) jack
5
D-E777/EJ721/EJ725
Remote control (for the models supplied with the RM-CD15L/CD16EL remote control)
ql
x (stop) button
w; VOL (volume) +/
buttons
qk HOLD switch
qj Display
ws
. (AMS/search) buttons
wa
N >
(play·AMS/search) buttons
wd Clip (rear)