Lisa jittery screens

From: Chandra Bajpai <cbajpai_at_attbi.com>
Date: Tue Dec 31 14:14:00 2002

This is the problem I had with my Lisa...check my post if anyone wants
directions on how do adjust.

-Chandra


-----Original Message-----
From: cctalk-admin_at_classiccmp.org [mailto:cctalk-admin_at_classiccmp.org]
On Behalf Of Tom Uban
Sent: Tuesday, December 31, 2002 2:52 PM
To: cctalk_at_classiccmp.org
Subject: Re: Lisa jittery screens


> > 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 - 14:14:00 GMT