Thanks for the info and links. "This is the most disgusting work I've ever done." <-- sounds like this will be a real treat.
I do see some suspect caps so I'll certainly be replacing those. Getting the main PCB going wasn't exactly a walk in the park but we'll see how this goes. Thanks again, James -----Original Message----- From: M100 <[email protected]> On Behalf Of Brian K. White Sent: Thursday, July 22, 2021 8:06 AM To: [email protected] Subject: Re: [M100] Floppy Disc Drive Motor 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. Ive 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 its spinning its 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. > > Im 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
