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SECTION 5
ELECTRICAL ADJUSTMENTS
1. PARTS REPLACEMENT AND ADJUSTMENT
• Check and adjust the MDM and MBU as follows.
The procedure changes according to the part replaced
• Abbreviation
OP : Optical pick-up
OWH :Overwrite head
• Temperature compensation offset check
• Laser power check
• Traverse check
• Focus bias check
• C PLAY check
• Self-recording/playback check
Parts Replacement and Repair
NG
Has the OWH been replaced?
NO
OK
NO
NO
NO
Has OP, IC171, IC101, or
IC121 been replaced?
YES
YES
Initial setting of the adjustment value
Has OP or IC171 been replaced?
YES
IOP information recording
(IOP value labeled on OP)
Has IC171 or D101
been replaced?
YES
Temperature compensation offset adjustment
• Laser power adjustment
• Traverse adjustment
• Focus bias adjustment
• Error rate adjustment
• Focus bias check
• Auto gain adjustment
Check the sled and spindle
mechanisms.
Other causes can be suspected.