30 Dec
2002
30 Dec
'02
12:14 p.m.
On Mon, 2002-12-30 at 21:04, John Lawson wrote:
You have not siad what you mean by 'jitter',
and I am not a Lisa owner..
perhaps this is a symptom common to the breed. But I would ask: is it
horizontal, vertical, is the raster fragmenting, is the brightness
varying?
The "jitter" manifests itself as a very slight (distance-wise) and rapid
vertical bouncing. The brightness is very consistent.
Is it a power supply problem that you are adjusting?
If so, when it
returns, is it time related? Temperature related? I see you have made the
I'm pretty sure it's a power-releated problem as adjusting the supply
temporarily fixes the problem. Heat may play a role in this, as the
jitter subsides to some degree when the system heats up. The
adjustments were made to a "warm" system.
adjustment in Sept., but nothing since then? If it
takes three months for
the problem to return, I'd be tempted to adjust for the party, then fix it
afterward....
I'll do this for now, but it shouldn't need to be adjusted so often.
It's a rather arduous process.
Just my two cents, and worth every penny of it.
Cheers and Happy New Year!
John