[sebhc] unpacking and ressurecting...

Walter Moore waltm22 at comcast.net
Mon May 17 11:39:40 CDT 2004

I had a similar problem with one of the FDD-100-5 drives, and traced it to a
bad 75472 (IC 4FB).  It could not hold one of the stepper lines low.  I
would compare the outputs of 4FA and 4FB with the good drive if possible.

I have a stack of these drives if you need to borrow one.  I haven't done
any lubrication to the stepper motors, and I still haven't ordered my
alignment disks, but I could loan you one that at least passes the heath

I also have a spare 75472 if you determine that is the problem.


> -----Original Message-----
> From: sebhc at sebhc.org [mailto:sebhc at sebhc.org] On Behalf Of Steven Parker
> Sent: Monday, May 17, 2004 8:28 AM
> To: sebhc at sebhc.org
> Subject: [sebhc] unpacking and ressurecting...
> The ressurection saga continues ....
> My floppy drive's step motor isn't physically stuck .. it moves freely by
> hand and if moved away from home, it returns to home under program control
> ... but it won't move AWAY from home.  So now I'm guessing there's a blown
> driver transistor for the other direction.

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