Recapping floppy drives

Update your old 720k to a 1.44 drive etc.
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troed
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Recapping floppy drives

Post by troed » Sun Apr 08, 2018 2:46 pm

(a.k.a, bring back the dead)

I have two piles of floppy drives in the closet. One of drives that no longer work, one of working drives. Usually I try really hard to source Epson 340 drives so that I can move the front bezel and eject button from the dead 380 to them, but after a while I run out of donor 380s as well as new 340s ...

... so, I really need to start getting that pile of non-working drives back up and running. I guess that in more than 50% of cases it should be solved by recapping, but there's a lack of info online from those who have done so. I thought this forum would be a good place to start ...

Currently I'm looking at doing Epson 480, 380 and a Sony MP-F11W (?). For many of them I've documented that they have "flaky motor on signal" which sounds like a dead ringer for caps ...

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exxos
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Re: Recapping floppy drives

Post by exxos » Sun Apr 08, 2018 6:04 pm

I did this one..

viewtopic.php?f=17&t=96

Though a lot of drives I have seen don't any anything but ceramic caps. Mostly dirty heads, or I think the 380's the heads seem to go out of alignment somehow. Though feel it could be the drive going out of tolerances and the "gain" of the head amp needs increasing. Though i never found any info on the chips I looked for, so difficult to diagnose the circuit in that respect :(
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troed
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Re: Recapping floppy drives

Post by troed » Sun Apr 08, 2018 6:16 pm

exxos wrote:
Sun Apr 08, 2018 6:04 pm
I did this one..
Perfect!! I'll start with the Sony then :D

Neffers
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Re: Recapping floppy drives

Post by Neffers » Mon Apr 09, 2018 1:22 am

GadgetUK on that there Youtube has done a few vids on floppy drives in general, he explains a lot and has been successful on many occasions. Might be helpful in general in addition to Exxos's thread.
Resident idiot. (Qualified, got a Diploma and everything)

Steve
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Re: Recapping floppy drives

Post by Steve » Mon Apr 09, 2018 1:13 pm

I wrote this post about cleaning floppy drives on the atari forum:
http://atari-forum.com/viewtopic.php?f= ... own+floppy

I fixed both my Falcon and TT floppy drives doing this. I didn't need to recap.

troed
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Re: Recapping floppy drives

Post by troed » Sun Apr 22, 2018 4:36 pm

Went to work on a Sony that almost never managed to get the motor running. Didn't have any SMD 10uF at home so I used two electrolytic 47uF on the same spots as described by exxos. Seems to have made the trick. Only doing it on the motor on signal and not the 5V supply didn't get there the whole way*.

Thanks for the very nice guide :) Next up, Epson 480 ...

*) This computer hasn't had its PSU recapped and there's some very slight dimming on each floppy step

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