I have 2 and they both had TEC FD-501 drives in them
Apparently this is the same drive used in the coco FD-501 external drive
and interface kit.
One of mine was dead and visually it looked like some caps were suspect
(I see some "stuff" near some caps, but it actually looks like it might
be unrelated, like some glue or something on another nearby part)
These aren't great overall pics of the drive, I was just trying to get
reference pics of a few suspect caps and traces just on the motor board
to get their values and orientation for reference later after I destroy
the original evidence. It's not shown here but this was in a D/V-I.
https://photos.app.goo.gl/Dz5R1rGRnzYAXy9J2
I haven't tried recapping that drive yet to see if it fixes it, but I
did find this:
https://atariage.com/forums/topic/274266-tec-fb-501-from-fd-501-leaked-10uf-caps/
http://personalpages.tds.net/~rcarlsen/cbm/msd/REPAIRS/MSD.txt
So bad caps are apparently a very common problem with this particular
drive, which means there's a good chance that will fix it.
So in summary, I would test the feel of the main spindle to feel if it
spins freely or is it stiff and needs cleaning and re-lubing. And
assuming it feels fine mechanically, re-cap the whole thing and look
real close for corroded traces.
And that idea that electrolyte can also seep inside near-by ic's and
destroy the bonding wires??? I never heard that one before but I think I
believe it.
--
bkw
On 7/22/21 8:11 AM, Jeffrey Birt wrote:
I have not torn my DVI apart yet, so I have not seen the drive up close.
Guessing it is a BLDC type, i.e. direct drive, not blet drive. I might
try to remove the spinning part of the motor (probably part you are
giving a push) and lubricate whatever bearings/bushings its shaft goes
through. (Just thinking out loud not having seen this drive in person.)
Jeff Birt
*From:* M100 <[email protected]> *On Behalf Of
*[email protected]
*Sent:* Wednesday, July 21, 2021 9:41 PM
*To:* [email protected]
*Subject:* [M100] Floppy Disc Drive Motor
Hi All,
Fairly new here but have been enjoying the discussion and learning a lot.
I am fixing a Disc/Video interface for use with my model 100. I’ve got
everything working fine now except I have to reach in and give the
spindle motor on the floppy disc drive a “push” from underneath with my
finger in order to get it started. Once it’s spinning it’s fine and
everything loads, but any time the motor stops (like after it reads a
disc), I have to do the same thing over again, which is of course not
very convenient.
I’m assuming this is a standard drive among Tandy equipment. Curious if
anyone who has a similar FDD has run into the same issue or has any advice.
Thanks much,
James Copeland
--
bkw
