Lisa jittery screens

From: Tom Uban <uban_at_ubanproductions.com>
Date: Tue Dec 31 13:48:00 2002

> > I have two different Lisa machines and both have a jittery display (one
> > 1.2AMP PSU, 1 1.8 AMP PSU). I've followed the instructions in the Sun
> > Rem. guide to adjust the power supply output. This works immediately
> > after the adjustment, but the problem gradually comes back over time. I
> > adjusted both machines around the September timeframe and the jitters
> > have back on both machines. I'd like to get both of these machines in
> > top-shape so I can have them running at my New Years party =)

As I recall, my Lisa had some sort of display problem when I first got it
and when I went to twiddle the various monitor board trim pots, the problem
cleared up. It was just old dirty contacts on the CRT adjustment potentiometers
that caused the problem. As long as you keep track of where they started, you
can often wiggle them back and forth a bit to re-establish a "good" contact.

--tom
Received on Tue Dec 31 2002 - 13:48:00 GMT