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4

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

5

This section is extracted from
instruction manual.

6

7

Note : Follow the disassembly procedure in the numerical order given.

r

 The equipment can be removed using the following procedure.

Set

Cabinet (rear)

Cabinet (front)

BATT (B) board, BATT (A) board, power board 

Cabinet
(upper)
  ASSY

Main board,
LCD board

SW (L) board,
jack board,
SW (R) board

REC board,
detect board

Over write head (HR901),
MD optical pick-up,
D SW board

MD block
ASSY

CD board

MD board

TOP board

Tuner
board

4

2

7

9

Cabinet (rear)

BATT (A) board

Chissis, transformer

BATT (B) board

Power board

5

Screws (+BVTP 3 X 12) (silver)

8

Screws (+BVTP 3 X 10)

6

Screws (+BVTP 3 X 10)

0

CN902

1

Claw

3

Claw

4

Main board

   CN801

Cabinet (front)

Cabinet (rear)

2

Screws 

  (+BVTP 3 X 12) (silver)

2

Screws 

  (+BVTP 3 X 12) (silver)

1

Screws (+BVTP 3 X 14)

1

Screws 

(+BVTP 3 X 14)

3