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A recap/update: It now successfully formats, verifies and mounts 800k disks (two-sided) in one shot (without having to format one side first). It appears to format 1.44mb disks but immediately fails/ejects on verification with every disk I've tried (about a dozen) that work fine in other drives.

Thanks for that clarification. Good to know.

Thanks. That's what I thought. Then the only thing I can think is that at some point I may have swapped the heads with an 800k drive. It's possible. I was assuming the part was the same? Is the head assembly between 800k and 1.44mb drives the same exact part?

So as I'm sitting at my bench going down the zero track alignment rabbit hole, I'm wondering - Would this drive logically be able to successfully format and mount 400k and 800k disks as described above if this was the issue ?

Thanks so much. I'm going to read the pdf and learn about this.

Yeah, definitely an FDHD. Interesting that I don't think I'm seeing the same numbers but I did just format a 1.44mb disk with a known working drive to make sure I'm not going crazy.

Yeah floppy drive has been recapped, Power supply recapped 12 and 5v a ok...I have several SE/30's and SE's and these disks work in my other drives so I know I've isolated the issue to this specific drive. I just tried this.... - Took a 1.44mb disk and put a piece of tape over it to trick the...

I have a 1.44mb Drive from an SE FDHD that is acting strangely (I also have a spare 800k that I could take some parts from). I'm pretty familiar with tearing the drives down and yes, the cheese cog has been replaced. Symptoms - The GOOD: - Eject mechanics are working perfecto...Drive is lubed...

Agreed. an SE/30 board is not where you want to hone your skills. If you're around Atlanta by chance, I'd be happy to help.

Mine works but is kind of dim (brightness buttons are unresponsive) and there's also an occasional vertical line. I see a few videos on YouTube about replacing motherboards but I don't see the point of replacing old failing components with other old potentially failing components. I'm pretty...

Well, I did recap all of them. Six of them everything went well. Had a good time with the microscope… Changed nothing in terms of the drive performances but at least now I can sleep well.

Yeah man...good luck getting it back to 100%!

I guess this is why I have four SE's... spare parts. At one point you could pick them up really cheap. also, did you recap the analog board? I wonder if failing capacitors could somehow cause the flyback transformer to go?

Curious if anyone has a recommendation. Mine appears to be blown...thanks.

I know this sounds weird, but I think I figured out what I've been doing wrong with the Pinecil... I have two dead tips. The iron itself is fine. The tips stop working shortly after I clean them using fine grit sandpaper which I know sounds stupid, but I've done stupider things… Not sure why...

Yeah definitely on the drive. Same issue when installed in a different mac.

Just curious. I know I've seen these in alot of SE cases, but I this is the first SE/30 case I've seen with them.

thanks. Yes this particular drive still has that problem.

Yep its good now. Replaced the UE8 chip.

Yes, always use kapton tape on the surrounding area. Especially plastics.