PMC-MD55 - Sony Audio Service Manual (repair manual). Page 5

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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”.

• 0.9 mW power

Specified value : 0.84 to 0.92 mW

• 7.0 mW power

Specified value : 6.8 to 7.2 mW

IOP (at 7mW)

• Labeled on the optical pickup

IOP value ± 10%

• Error rate check

Specified value :
a. For points A and B

C1 error : About 200
ADER : Below 2

b. For point C

C1 error : Below 50
ADER : 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

Laser power check
(6-1 : See page 23)

Focus bias check
(6-2 : See page 23)

C PLAY check
(6-3 : See page 23)

Self-recording/playback
check
(6-4 : See page 23)

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

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

• Replace the optical pick-up

• Replace the optical pick-up

• 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

Measure if unsatisfactory:

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.

pulley

DC motor (CD lid open/close)

2.5 mm

Press fit pulley to motor with jig.