[sebhc] Floppy drive circuit boards

[Mark Garlanger]

Does anyone know if the circuit board (the one physically connected to
a floppy drive) is calibrated (or otherwised tuned for the mechanical
part of that particular drive? I have two of the Wangco model 82's
that have different issues. The first one fails the seek test even at
36 msec. The second pulls down the 12V supply line. I didn't know what
could be done with the first one, so I attempted to fix the second
one. It had an obvious burnt inductor 'L5'. But, from looking at the
circuit diagram and what little I remember from EE, it didn't see how
this would explain the problem with the 12V supply. So, maybe there
are other damaged parts on the board. Due to this and not having an
inductor on hand, I thought I would use the board from the drive with
the seek problem to see if I could make one working drive (both
circuit boards looked identical and have the same number on them -
although one drive has a red led and the other has a yellow). When I
tried to use the newly created drive, it sounded awful, and did not
work. I was wondering if anyone knows if this could be related to the
'foreign' circuit board? I'm thinking, it's more likely that there is
a mechanical issue with this drive which may have cause the burnt
inductor on the original circuit board. If that is likely the case,
I'm not going to spend the time to try and repair the original board,
but if could be related to the foreign board, I may track down the
parts and attempt to fix it.

Thanks,
  Mark
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