Apple Lisa 1 - restoration project

[John Honniball]

David W. Erhart wrote:
> I've been hoping to get an Apple Lisa for years now.  Recently I had an 
> Apple Lisa 1 and an Apple Lisa 2 donated to me.

I also have a (non-functional) Lisa 2.

> I've taken the Lisa 1 apart 
> to examine the damage from the battery acid.

If those are Ni-Cad batteries, it's battery alkali, not
battery acid.  At least, I think that's correct -- do
reply if I'm wrong!

> Here are pictures (tons of 
> them) of the Lisa 1: 
> http://entertainment.webshots.com/album/563938145wklDTp
> 
> I'm open to suggestions on how to revive the Lisa 1.

In photo DSC05355, we can clearly wee that a SIL resistor
pack has peeled open next to the batteries.  That'll need
to be deolsdered and replaced.  It's marked "750-81-R10K",
which I think means it's a 10K pack, but of course you'll
need to figure out whether it's a bunch of separate
resistors or a group of resistors with a common connection
(I'd guess that the latter is more likely).

Then there's all that green corrosion on the PCB.  See if
it'll brush off with a dry toothbrush (an old one!) and
then check for broken PCB traces and/or IC pins.  All the
ICs in that area are very clearly labelled and there's
nothing unusual that I can see there.

Diode D6 is very messy, but it might all just clean off.
You'll need new Ni-Cads, of course!  The old ones are
date coded 8336, meaning 1983, week 36.  Are they AA size?
If so, maybe best to desolder them and fit replacements in
a separate battery holder.

Those photos are making me want to go and open up my Lisa
and check...

-- 
John Honniball
coredump at gifford.co.uk