RE: Star Wars problems

If there's a bad ground for the HV, your picture can bloom. But, thsat
would be both directions at once.

JB

-----Original Message-----
From: Matt Rossiter [mailto:rossiter@ni.net]
Sent: Wednesday, September 10, 2003 5:00 PM
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: Star Wars problems

I have had this same problem with the horizontal going nuts after a
while.
I'm guessing you might have a ground problem somewhere in the power
supply.
Some of the guys on the list can explain this better than I can, but if
there is a bad ground and the high voltage goes down - the picture tends
to
expand.

On my star wars I got really confused when the x/y outputs on my scope
were
rock solid - and I had swapped in Amplifone boards that I knew worked
fine -
and still the picture would shake.

If you can - check all the connections on the power supply block or swap
in
another power supply block to see if the problem goes away.

Matt

----- Original Message -----
From: "Hendrix, Jeff" <Jeff_Hendrix@maxtor.com>
To: <vectorlist@vectorlist.org>
Sent: Wednesday, September 10, 2003 11:31 AM
Subject: VECTOR: Star Wars problems

> I have a star wars with an amplifone monitor in it that has some
strange
> behavior.
> This game also has an Arcadeshop HV board (but I don't think the HV
board
is
> the problem)
>
> Most of the time the screen looks normal, but sometimes (either after
it's
> been on for a while or sometimes when it's first turned on) the screen
will
> shake and very rapidly change size, but only in the x (horizontal)
> direction. All horizontal lines are stable, except getting longer and
> shorter. (this is why I don't think the HV unit has anything to do
with
it).
> The output from the board looks fine on my scope (while it
simultaneously
> looks bad on the monitor).
>
> I poked around on the deflection board a bit and haven't found
anything
> obvious, but I don't have a lot of experience with amplifone boards.
Anybody
> know off the top of their head what the problem might be?
>
> Thanks
> -jeff
>
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