Don't count on a disk drive working, even though it may physically fit.
I bought a used KN5000 that had a nonworking floppy drive. After failing to find a Technics replacement, I contacted a firm that specialized in making clones. The firm tried for two weeks to duplicate the propriatory software and failed. Because it fits is just half the battle.
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Audya76, Yamaha S910, Technics KN7000, vArranger