MDS-JA555ES - Sony Audio Service Manual (repair manual). Page 9

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Cause of faulty can be approximately located by performing the following checks before starting the repair work.  Refer to Section “5.
Electrical Adjustment” the check procedure.

Note: The judgment criterion is shown for the purpose of judging if the performance is acceptable or not.  This is not the specification value for adjustment.

Use the specification value for adjustment when the MDS-JA555ES is going to be adjusted.

Laser power check
(Refer to section 5-6-2, page 27.)

Traverse check
(Refer to section 5-6-3, page 28.)

Focus bias check
(Refer to section 5-6-4, page 29.)

C PLAY check
(Refer to section 5-6-5, page 29.)

Self-recording/playback check
(REC/PLAY)
(Refer to section 5-6-6, page 29.)

Temperature compensation
offset check
(Refer to section 5-6-1, page 27.)

Judgment criterion(NG when the measurement

value is out of the specification value)

• 0.9 mW power

Specification value: 0.84 to 0.92 mW

• 7.0 mW power

Specification value: 6.8 to 7.2 mW

• Iop (when 7 mW)

The Iop value that is shown on the optical
pick-up: +/- 10 mA

• Traverse waveform

Specification value: Offset 10% or less

• Checking the error rate

Specification value: All points of a, b, and c
CI error  220 or less
AD error  2 or less

• Checking the error rate

Specification value:
a. When using the test disc (MDW-74/AU-1)
    CI error  80 or less
    AD error  2 or less
b. When using the check disc (TDYS-1)
    CI error  50 or less

• Checking the error rate in C PLAY

Specification value:
CI error  80 or less
AD error  2 or less

• NG when “T=@@(##)(NG” appears

(@@ and ## are arbitrary numbers.)

Remedial measure in case of NG

• Cleaning the optical pick-up
• Readjustment
• Replacing the optical pick-up

• Replacing the optical pick-up

• Replacing the optical pick-up

• Replacing the optical pick-up

• Replacing the optical pick-up

In case of NG all the time:
• Replacing the overwrite head
• Check disconnection of the circuits around

the overwrite head

In case of intermittent NG:
• Check deformation of overwrite head
• Check mechanism around the sled

• Check disconnection of the circuits around

the D101 (BD board)

• Check signals around the IC101, IC121,

CN102 and CN103 (BD board)