Sony Walkman D-E777, Walkman D-EJ721, Walkman D-EJ725 Service Manual
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 : 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)
–2
Output (at 4.5 V input level)
Line output (stereo minijack)
Output level 0.7 V rms at 47 kΩ
Recommended load impedance over 10 kΩ
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
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 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.
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 damaged 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
(51/4 x 11/16 x 55/8 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
*1Not supplied with Canadian, AEP, G, UK,
FR and EE models
*2Supplied 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
LOCA TING THE CONTR OLS
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)
6
D-E777/EJ721/EJ725
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1. CABINET (REAR), CABINET (FRONT)
3-2. MD ASSY, MAIN BOARD
z
The equipment can be removed using the following procedure.
3
CN502 (green)
4
2
CN503 (white)
1
Optical pick-up
flexible board
MD ASSY
Main board
Cabinet (rear)
Cabinet (rear) MD ASSY, Main board
“Lid, upper”, Switch unit
“Motor ASSY (Sled) (M902)”, Optical pick-up (DAX-23E)
“Motor ASSY, Turn table (Spindle) (M901)”
Cabinet (front)
Set
Cabinet (rear)
1
Screw (2x8)
1
Screw (2x8)
4
Switch unit flexible boar
d
Cabinet (front)
2
Claw
2
Claws
3
2
Claw
7
D-E777/EJ721/EJ725
3-3. “MO TOR ASSY , TURN T ABLE
(SPINDLE) (M901)”
3-4. “MOTOR ASSY (SLED) (M902)”,
OPTICAL PICK-UP (DAX-23E)
3
5
6
2
1 Screw (B 1.7x5)
4 Screw
(P 1.4x3.5)
Screw ASSY, Feed
Chassis
Optical pick-up
(DAX-23E)
Retainer, shaft
Gear B
Cover, Gear
Motor ASSY (Sled) (M902)
2
Motor ASSY, Turn tabl
e
(Spindle) (M901)
1 Screws
(B1.7x5)
Chassis
3-5. “LID, UPPER”, SWITCH UNIT
4
2
6
Switch unit
Cover, lid
Cabinet (front)
Lid, upper
1
OPEN
5
Claws
3
Screws
8
D-E777/EJ721/EJ725
Procedure:
1. Connect the oscilloscope to the test points TP629 (RF) and TP635
(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)
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.
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:
RF level
0.45 to 0.65 Vp-p (D-E777/EJ725)
0.38 to 0.6 Vp-p (D-EJ721)
VOLT/DIV : 100 mV (With the 10 : 1 probe in use)
TIME/DIV : 500ns
IC501
D461
C615
C505
R616
R649
IC604
C622
C461
R506
R654
TP922
TP635
(GND)
TP637
TP638
R463
TP912
Q501
R624
TP641
TP419
R635
C625
C646
TP403
R653
R647
C605
C609
R504
R652
C501
R625
TP501
TP503
FB602
TP502
TP504
C620
FB603
TP417
C631
C632
C630
R657
R104
R617
R505
D603
R615
D602
C645
TP633
TP629
(RF)
TP630
C635
C636
C502
TP632
C506
C462
R655
C507
R
619
C628
C626
C624
C623
R656
C613
TAP602
TP302
TAP403
IC603
R509
TP920
TP9
R
620
C634
C614
C504
TP631
R5
R4
EXCEPT
EXCEPT
US MODEL
EXCEPT
US MODEL
US
M
1
56
10
11
15
1620
1
3
45
1
3
1
8
916
TP629 (RF)
TP635 (GND)
2 K
Ω
oscilloscope
(AC range)
[ MAIN BOARD] (Side B)
Loading...