Yes sounds like Amiga if D0 was jumped. I found a picture off ebay and zoomed in shows just D1 and RY jumped.

added: found the reference to RY-DC vertical FD-235F-100, is for an Amstrad/Schneider. Korg uses straps on RY, DC and DS0 with a note that you must change from DS1 "is for PC's"

Just had an issue with an old CDRW where it was not working proper reading a data cd yet would play an audio cd and could hear it through it's headphone jack with headphones (so I knew the electronics was still good). It had been sitting in garage a few years. Had to clean the connectors even though they looked good, appear to be gold plated. You might want to use some 99% alcohol on the pins where you connect the floppy cable just in case, only takes one dirty pin to make something not work.

if it did come from the era of the Amiga, I had a teac 720K in my A1200 that needed recapped. Same symptom as it wouldn't read or write disks. Ended up the faulty caps were what regulated the RPM on the disk motor if I remember right.

I found a 1992 .doc from Teac which gives the straps (jumpers) for 235-100 and it is just like you mentioned SirNickity
"FDD-235-100/112 Jumper Block: D1/1-D1/2 and RY/1-DC/1 must be shorted." I attached the docu

Nice find, Horun! Thank you!

Alas, I guess that means it is an issue with the drive. Will have a go with replacing the caps and see if that changes anything. There aren't many, but it looks like they're a little smaller than the generic ones I keep on hand. Might have to rig something up just to see if it makes a difference - I really don't want to give up on this drive. 🙁

A true 720k floppy drive is worth fixing as is a true 360k floppy drive.
Someone mentioned the caps on the motor drive board as the culprit in another thread, if it were me would start there.
I wish you luck and if you do get it working let me know please.

Indeed -- you guys just saved a perfectly good floppy drive. There are three 22uF (notably, bipolar) electrolytic, and one 4.7u (polar) electrolytic. The latter measured 2nF when I tested it out-of-circuit. I replaced them all with spares and it works fine now! 😁

Will need to order actual replacements though. These are really small, and my bipolar caps are HUGE in comparison. It won't fit in a 3.5" bay as-is. Heheh

Thanks guys. I owe ya one. 😀

Great ! lowlytech deserves all the creds for the cap issue.

I replaced some capacitors on the floppy drive in my T3200 and it came to life also, though those capacitors cleraly showed that they were having it no more xD

Mine looked positively fine. Let that be a warning to anyone who finds this thread looking for repair advice. 😀 It might look fine and still be a bum cap! Give it a shot anyway.

I have a Teac 55GFR 41xx 5.25" giving the seek error, will replace the caps and see if it helps. It only has 3 Electro's on main board and none on the motor board which makes me think there is more to this ones problem, Am glad you got yours working !