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
µ
W
(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
Ω
Recommended load impedance over 10 k
Ω
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
