Micropolis 1525 stuck heads

[Paul Anderson]

I have about a dozen or so 1325,1335, and 1355 drives here, also some
earlier ones (some have the DEC label) RD50, 51,52, and even a few 54s. If
anyone is interested, please contact me off list.

Thanks, Paul

















On Mon, Sep 20, 2021 at 1:14 AM Chris Zach via cctalk <cctalk at classiccmp.org>
wrote:

> That is what fixed it, hair dryer blowing around the unit. I stayed away
> from the circuit boards and just kept moving to different places. I
> thought a head was sticking, but it finally started to move a bit so it
> might have been a really gummed bearing. Or #3 head was stuck and
> loosened, most of the errors are on that head.
>
> Running it through the MFM tool got all but 200 or so sectors on the
> first pass, most errors were on head 3 but tapered off after cyl 500.
> Seems like a normal copy of Accent, no special information so it might
> not be worth taking the world apart to get it working.
>
> Thanks everyone. Back to
>
>
> On 9/20/2021 12:17 AM, Jonathan Stone via cctalk wrote:
> >   I had suggested a hair-dryer, as recommended circa 20 years ago for
> drive "stiction" after disuse. It seems that worked.
> >       On Sunday, September 19, 2021, 08:58:57 PM PDT, Bill Degnan via
> cctalk <cctalk at classiccmp.org> wrote:
> >
> >   I have simply opened and physically moved the disk counter clockwise a
> > turn, in a clean dust-free place.  Or try putting in an oven on warm for
> 3
> > minutes a side, all four sides to loosen the grease.  Might sound crazy
> but
> > these have worked for me before
> > Bill
> >
> > On Sun, Sep 19, 2021, 10:18 PM Zane Healy via cctalk <
> cctalk at classiccmp.org>
> > wrote:
> >
> >> 20+ years ago, I remember people talking about disassembling these to
> fix
> >> the issue.  I’ve never tried.  Though I have one or two that might
> benefit
> >> from is.  If the CLASSICCMP archives from ’97-2000 are online, I’d
> >> recommend running a search against them.
> >>
> >> Zane
> >>
> >>
> >>
> >>
> >>> On Sep 19, 2021, at 3:58 PM, Chris Zach via cctalk <
> >> cctalk at classiccmp.org> wrote:
> >>> Ok, so out of the basement came a Micrapolis 1325 (the old Dec RD53
> >> disk) with what appears to be stuck heads. Rotor tries to move under
> power
> >> but can only take out slack. Will move backwards a bit.
> >>> Is this stuck head, and what would be the best way to free it? The
> >> reason I'm asking is this disk had a SA1000 adapter mounted under it so
> I
> >> am pretty sure it was a PERQ disk. Which means data may be priceless.
> And
> >> of course it's stuck.
> >>> Thoughts?
> >>>
> >>> CZ
> >>>
> >>
> >
>