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The laser diode in the optical pick-up block may suffer electro-
static 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.

1-2. 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 objectivelens.

1-3. 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.

1-4. 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.

  0  OR DOTTED

 0 ON THE SCHEMATIC DIAGRAMS AND IN

1. Turn on the POWER and open the CD cover.
2. As shown below, push S701 (CD DOOR) with a screwdriver or

other tool.

3. Press the CD button.
4. Check the objective lens to make sure that the laser diode is

emitting light. If not so, the auto power control circuit or
optical pickup would be damaged.
Verify that the objective lens moves vertically three times for
focus search.

This Compact Disc player
is classified as a CLASS 1
LASER product.
The CLASS 1 LASER
PRODUCT label is located
on the bottom exterior.

CAUTION
Use of controls or adjustments or performance of proce-
duresother than those specified herein may result in haz-
ardous radiation exposure.

1-5. CHUCK PLATE JIG ON REPAIRING
On repairing CD section, playing a disc without the CD lid, use
Chuck Plate Jig.
• Code number of Chuck Plate Jig: X-4918-255-1

Insert a precision
screw driver and push
SWITCH (S701)

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Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent.
Details of the procedures are described in “5 Electrical Adjustments”

Laser power check

Criteria for Determination
(Unsatisfactory if specified value is not satisfied)

Note:
The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for
adjustments.
When performing adjustments, use the specified values for adjustments.

Measure if unsatisfactory:

• Clean the optical pick-up
• Adjust again
• Replace the optical pick-up

• 0.9 mW power

Specified value : 0.80 to 0.96 mW

• 7.0 mW power

Specified value : 6.8 to 7.2 mW

lop (at 7mW)

• Labeled on the optical pickup

Iop value 

±

 10%

• Replace the optical pick-up

If always unsatisfactory:
• Replace the overwrite head
• Check for disconnection of the circuits around the

overwrite head

If occasionally unsatisfactory:
• Check if the overwrite head is distorted
• Check the mechanism around the sled

• Error rate check

Specified value : For points a and b
C1 error : About 200
ADER : Below 2
Point C
C1 error :Below 50
AD error :Below 2

• Error rate check

Specified value:
a. When using test disc (MDW-74/AU-1)

C1 error : Below 80
ADER : Below 2

b. When using check disc (TDYS-1)

C1 error : Below 50

• CPLAY error rate check

Specified value:
C1 error : Below 80
ADER : Below 2

• Replace the optical pick-up

• Replace the optical pick-up

Focus power check

C PLAY check

Self-recording/playback
check

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This section is extracted from
instruction manual.

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