Re: Swapping Lisa components

From: Jason Perkins <perkins.jason_at_email.domain.hidden>
Date: Tue, 24 Feb 2009 17:04:56 -0500

Ian, sounds like the battery pack. You can remove the battery pack. Do a little research on the Lisa FAQ for more info about this.

On Sat, Feb 21, 2009 at 8:59 PM, VW <VanWitzenburg_at_email.domain.hidden> wrote:

> I've got a Lisa 2/5 with no external 5MB Widget with a faulty
> component on the power supply motherboard. This little 1.5"x1.5"
> blocky black thing with a yellow band on top that reeks like you
> wouldn't believe. (Some cracking on the band is visible as well) Any
> idea what component this is? If the modern equivalent is smaller, I
> don't mind soldering wires to make up the distance... I haven't found
> any Lisa board schematics explaining what components on the
> motherboard are yet, but was hoping someone here knows?
> I'm hoping this is the only hurdle left, the monitor seems crisp but
> there is a garbled video signal (hopefully from the underperforming
> power supply). Everything looks great, even 2 memory boards installed.
> I just can't afford $200 for a 1.8A Lisa power supply, and want to
> solder/replace the equivalent on the board.
> Cheers,
> -Ian
> On Feb 21, 1:37 pm, Ray Arachelian <r..._at_email.domain.hidden> wrote:
> > James MacPhail wrote:
> > > The clicking PSU is either a short circuit or its voltage set too high.
> >
> > I've had that happen with one of my power supplies, and replacing the
> > dead capacitors was the fix.
> > But of course, the one with the I/O board battery leaks will have other
> > issues. :-)
> >
> > Peter, if you happen to have a spare I/O board, that might help. If you
> > do and there's no damage around the COPS421 chip, you should at least
> > save that chip - VIAs and the Z8530 are far less rare, but the COP421
> > are very difficult to find replacements for as the only sources will be
> > other Lisa I/O boards. Obviously try to repair the board as best as you
> > can.
> >

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