4 Apr
2015
4 Apr
'15
2:55 a.m.
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Holm
Tiffe
Sent: 04 April 2015 10:00
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: RD54 Stopped Spinning
Robert Jarratt wrote:
>
>
> > -----Original Message-----
> > From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of
> > Eric Smith
> > Sent: 04 April 2015 04:01
> > To: General Discussion: On-Topic and Off-Topic Posts
> > Subject: Re: RD54 Stopped Spinning
> >
> > On Fri, Apr 3, 2015 at 11:44 AM, tony duell
> > <ard at p850ug1.demon.co.uk>
> > wrote:
> > > The RD54 is a Maxtor XT1140 or something similar.
> >
> > The RD54 is a Maxtor XT2190, which, as you say, is quite similar to
the
XT1140.
> > Both have 15 data heads (eight platters), but the XT2190 has a
> > higher cylinder count (1224 vs 918), reportedly at least in part due
> > to use of a better head design.
> >
> > Maxtor pioneered the use of the drive motor integrated in the
> > spindle, which is what allowed them to fit eight platters into a 5
> > 1/4" drive in 1983, when other vendors were limited to four platters.
>
> Hmm... does that mean it might be difficult to reach/see/replace the
hall
effect sensors?
you
Regards
Rob
Difficult? Hmm.. I would say they are some of the last things you see if dismount the entire drive including the stack of
platters.
This is what is worrying me. I suspect this would be a very difficult
repair. I have enough bad RD54s that I suppose I could sacrifice one to work
out how to do it (if at all!).
This is not the way to repair the drive.
Try to find out if the Motor Coils are ok and connect a scope to the
phases to
see what's going on after power up.
Is there a good resource on the theory so I can work out how it all works
and what to expect when I use a scope? Wikipedia has some stuff, but it is
all a bit theoretical.
I've repaired several old disks with different
failures and opended them
at
home, but this isn't really what you want and you
should avoid doning this
if
possible. Some people say doing this in the kitchen a
boiling put of water
nearby is the best you can do to avoid dust ..
Nice idea, one to try!
Thanks
Rob