Re: Profile Drive issues (of course)

Hi Steve,

Many thanks for that very quick reply.

Yes, reseating, the checking of cables and voltages is always a good first step with these things and I did those before The voltages check out just fine,

Interestingly this board is specific Profile 10 MB controller (1984) so there is no piggyback on the Z8.

Interesting comment about the HAL sensor. On (rare) occasions the drive DOES'NT do it's self-check so I might have a look at that. It involves opening up the drive I guess. I see some large screws there at the top. Very tempting but I'll need to do some reading first for I know what I'm looking for. I do have the Apple Profile Repair journal. I just wish I had the software and Apple III to go with it! (-:

What does encourage me was that I did GET a boot (even if it's once in the blue moon) and so the media itself would seem to be ok. I suspect hardware

Terry (Tez).

On Sun, Jan 22, 2012 at 4:02 PM, snhirsch <snhirsch_at_email.domain.hidden> wrote:

> On Jan 21, 9:44 pm, Terry Stewart <te..._at_email.domain.hidden> wrote:
>
> > However, I've only been able to repeat this a few times. Probably only
> > about 3 times in about 40 attempts.
> >
> > Anyway, as I thought the drive was completely gone, I am a little
> > encouraged in the fact that it does work...very occasionally.
> >
> > I did try to reinstall MacWorks XL 3.0 but the Lisa told me there was a
> > hard drive error (-93 I think).
>
> Terry,
>
> I would start by carefully checking all the internal cabling for
> partially-seated connectors and/or tarnished contacts. Reseat all the
> chips on the controller board with a push of the thumb, etc. If your
> unit has the piggyback Z8 (EPROM on top), pay special attention to
> that socket. Power supplies on these things are not the world's best,
> so worth checking voltages also.
>
> I think I know that little brrrpping sound you describe, but I'm not
> entirely sure what causes it.
>
> At least one drive here had a fading Hall sensor on the HDA. I moved
> it in a bit closer to the metal finger on the flywheel and brought it
> back that way. Symptom there was the drive not reliably coming ready
> after spin-up.
>
> Steve
>
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