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Hi-Fi Products CSA-13
Service Bulletin
Sony Service Company - Technical Services
A Division of Sony Electronics Inc.
Sony Drive, Park Ridge, New Jersey 07656


Model: MDS-501 No. 451
Subject: RF/Servo Board Procedure when replacing Date: November 10, 1995
Optical Device


Symptom:
(****) The original optical device KMS-140B, (Ref. #21) P/N 8-583-003-21, has been
replaced by the KMS-140C (P/N 8-583-005-11).

After replacing the optical device, you may find that the unit will play CD discs but
not MO discs. Proper adjustment also may not be possible after replacing the optics.



Solution: Perform the following procedure on the conductor side of the RF/SERVO Board: