[Coco] Need Teac FD50a-03 spindle motor driver schematics (fwd)

[Marty Goodman]

Gene,

 Hello there, old friend!  Long time, no see or chat!

I'm sorry, but I don't think I've got schematic info on the controller board
in general, or the spindle motor controller in particular, for the Teac
FD-50A-03 5.25 in drive.  It's just been too long.  And while I do still
retain (for how long? probably not long) all my old CoCo and CoCo Accessory
schematic and software technical files, I can't recall ever having
schemnatic info on the controller boards for disk drives... with possible
exception of the old Tandon T100 full height.  And I don't think I kept
THAT.

Worse, I'm in New York City right now, far from my CoCo files (which are at
my California residence).  IF you like, feel free to give me a gentle
reminder after November 18, and I'll do a check for you to see if, on some
long offchance, I can find the info you seek.

It was Art Flexser who called your query to my attention.  He lives in
Miami, but he was up here yesterday in the New York City area, at his
childhood home in New Jersey, dealing with a death in the family.  We got
together and strolled across the Brooklyn Bridge together as the total lunar
eclipse of 11/8 approached totality, last night.

Actually, I don't subscribe to this list, and hadn't even know Dennis Kitz
had provided a new haven for it to shelter subscribers from spam, until Art
told me last night.

How is Dennis Kitz?  I think of him, periodically.  He's an outstandlingly
brilliant and kind fellow, who has had more than his share of trials in
life.  I hope he's doing well, now.  Or at least, is happy and continues to
be creative. Ewe out dere, Dennis?  Allow me to send you my best wishes.

 ---marty

> On Wednesday 05 November 2003 14:09, Gene Heskett wrote:
>
> and quoted the wrong drive model in the subject line, its actually an
> TEAC FD-50A-03, and I seem to have managed to collect a few of them,
> all with bad heads these days.  My bad, they all look alike after a
> while.
>
> >Greets everyone & Marty Goodman in particular;
> >
> >If anyone has a schematic for the spindle motor driver card thats
> >mounted on the bottom of these drives, I'd sure appreciate a copy.
> >
> >Its a neat little assembly in that it needs ground, 12 volts, and a
> >logic signal sink to control it as it plugs into the main board on a
> >3 wire cable.
> >
> >I've removed the motor and card (its a seperate card from the drives
> >main board) and have made it into a motorized powder trickler
> >controlled by an ir emitter/transistor combo that watches the
> > balance beam of my powder scale.  It actually works pretty well,
> > usually stopping the trickler tube within .05gr of the target
> > setting. Unforch, I have to shut the motor off way ahead of time
> > because the rig coasts about one whole revolution of the tube when
> > it stops.
> >
> >I'd like to modify the driver to put a dc braking into the motor and
> >stop it a lot faster but I'd need the schematic to do that
> >conversion.
> >
> >I sure wish they'd have done the drive stepper motor the same way, I
> >could roboticize a lot of things, but its built into the main board.
> >That stepper has plenty of moxie for a lot of things.
> >
> >Anyway, if someone has that, can scan it into a format (.jpg, .gif)
> >that I can load into gimp and print it, I'd be very gratefull.
> >
> >--