Re: 400KB Lisa floppy drive non operational- felt pressure pad is missing

Hi Geoff,

I had similar problems with my 400KB and 800KB drives- you should have a known good 800KB drive (test it in your Mac Plus or Mac 512 KB etc.) Then you will need the SUNrem 800KB floppy disk EPROM for the Lisa I/O board, otherwise your 800KB floppy won't be recognized by the Lisa. As far as you told here you should have a Lisa Lite card.

Helmut

On 23 Mrz., 17:20, Geoff Barrall <geoffbarr..._at_email.domain.hidden> wrote:
> I'm also having issues with a 400k drive (dated sept 1984) in one of my Lisas. The Lisa is a newer model and has an integrated ProFile above the drive. The floppy drive looks similar to another tested good Lisa floppy drive I have from an earlier model (dated dec 1983) but that drive has a daughter board next to it in it's own Lisa and doesn't seem to work as a replacement (seemed to exhibit random activity) in the newer one. I've also tried a more modern 800k drive which also didn't work (same issue). FInally I tired a 400k drive from a 512k Mac from approx the same era but same issue there. Can anybody provide me with guidance on which kinds of Floppy Drive should work so I can determine if the issue is with drive compatibility or possibly an issue on the I/O board?
>
> Many thanks,
> Geoff
>
> On Mar 23, 2011, at 2:46 AM, Diogenes45 wrote:
>
>
>
> > I have  just examined the 400 KB disk drive: Many of the sub miniature
> > caps are dried-out (I have a special capacitor tester) - the signal
> > from the PCB to the R/W heads and vice versa is very weak and
> > distorted.
> > I think it's futile to exchange all caps on the board... the best
> > solution would be a replacement drive (or original Sony controller
> > board) or even better: an upgrade to a 800KB drive.
>
> > Helmut
>
> > On 22 Mrz., 22:56, "Terry Stewart" <te..._at_email.domain.hidden> wrote:
> >> Helmut,
>
> >> I do have two non-working drives which aren't worth much to me.  If you like
> >> I could have a go at extracting the pad from one of them and posting it to
> >> you?  It's so small posting charges will be trivial.   Would you like me to
> >> give it a go?
>
> >> Terry (Tez)
>
> >> ----- Original Message -----
> >> From: "Diogenes45" <helmut_p..._at_email.domain.hidden>
> >> To: "LisaList" <lisalist_at_email.domain.hidden>
> >> Sent: Wednesday, March 23, 2011 3:28 AM
> >> Subject: 400KB Lisa floppy drive non operational- felt pressure pad is
>
> >> missing
>
> >>> Hello!
> >>> I have a problem with my 400KB Lisa disk drive: The Read/Write heads
> >>> have no contact to the magnetic media  because the pressure pad with a
> >>> small round  piece of felt is missing now,and I have no idea where it
> >>> is gone.... it's not inside the drive or the Lisa...I have searched
> >>> everywhere, but I think, it's hard to find such a tiny piece in a
> >>> large room....no luck so far after many hours of intensive search.
> >>> Do you have any idea where I can get this small piece?
>
> >>> Thanks!
> >>> Helmut
>
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