Electrical Adjustments - Sony MDS-SP55 Service Manual

5-1. PARTS REPLACEMENT AND ADJUSTMENT
• Check and adjust the MDM and MBU as follows.
The procedure changes according to the part replaced
• Temperature compensation offset check
• Laser power check (5-6-2)
• Traverse check (5-6-3)
• Focus bias check (5-6-4)
• C PLAY check (5-6-5)
• Self-recording/playback check (5-6-6)
Temperature compensation offset adjustment
22
SECTION 5

ELECTRICAL ADJUSTMENTS

(5-6-1)
NG
Parts Replacement and Repair
Has the OWH been replaced?
NO
Has OP, IC171, IC101, or
IC121 been replaced?
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
• Laser power adjustment (5-10)
• Traverse adjustment (5-11)
• Focus bias adjustment (5-12)
• Error rate check (5-13)
• Focus bias check (5-14)
• Auto gain adjustment (5-15)
OK
Check the sleding and spindle
mechanisms.
Other causes can be suspected.
YES
NO
NO
NO
• Abbreviation
OP : Optical pick-up
OWH: Overwrite head