Sony MDS-JA555ES Service Manual

9
[Checks before Part Replacement and Adjustment]
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)

Sony MDS-JA555ES Specifications

General

Brand	Sony
Model	MDS-JA555ES
Category	Stereo System
Language	English