Sony CD Walkman D-EJ011, Service Manual

3

D-EJ011

SECTION 1

SERVICING NOTES

NOTES  ON  HANDLING  THE  OPTICAL  PICK-UP
BLOCK  OR  BASE  UNIT

The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down 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 30 cm away from the objective lens.

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 S811. (push switch type)
The following checking method for the laser diode is operable.

Fig. 1 Method to push the S811

SECTION  2

GENERAL

This section is extracted from
instruction manual.

LOCATING THE  CONTROLS

• Method:

Emission of the laser diode is visually checked.

1. Open the upper lid.
2. With a disc not set, turn on the S811 with a screwdriver having

a thin tip as shown in Fig.1.

3. Press the

u 

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 pick-up is faulty.
In this operation, the objective lens will move up and down 2
times along with inward motion for the focus search.

S811

Remaining battery power

Sound mode

Track number

Playing time

Play mode

Bookmark

* The button has a tactile dot.

^

*(play/pause) 

DC IN 4.5 V

2

 (headphones) jack

p

(stop)

HOLD (rear)

VOL –/+*

Headphones

SOUND/AVLS

= +

/

P MODE/

OPEN

Display