Re: Amplifone jitters

        Uh-oh. I have exactly the same problem. I rebuilt the HV board
around the same time.

        Didn't Jess Askey's WinTron just die? Am I seeing a disturbing
pattern here, or just being paranoid?

Joe

On Tue, 23 Jun 1998, Joel Rosenzweig wrote:

> Has anyone had a problem with their Amplifone jittering? What did you
> do to solve it?
>
> Last October, I rebuilt an HV board with a WinTron and a cap kit, and
> rebuilt the deflection board with a cap kit, minus the deflection
> transistors.
>
> All has been working well until last week. I now notice that I get
> screen jitter, most noticeable at the top and bottom of the screen.
> These areas seem to jump about 1 in, up and down. The jitter is not
> constant. For a time, there will be jitter, then no jitter, then jitter
> again. It doesn't seem to go away as the machine warms up.
>
> I have some things to check, but I thought I'd ask, just in case someone
> has a really good guess right off the top of their heads.
>
> This monitor is in a Star Wars game, and I've never replaced that 10K
> resistor on the AVG board mentioned in the FAQ. That says something
> about replacing this part if you experience jitter. However, I have no
> reason to believe that this part has suddenly failed ...
>
> I'll stick the game on the scope in order to check for sure, but I'm
> still more inclined to think it's a monitor problem.
>
> Anyone have some ideas of where to target?
>
> Loose ground wire, bad caps, possible deflection transistor problem,
> etc?
>
> Joel-
>

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Joseph J. Welser jwelser@ccwf.cc.utexas.edu
Design Engineer -- Crystal Semiconductor Corporation
Ph.D. Student in E.E. -- University of Texas at Austin
Work: jwelser_at_crystal.cirrus.com http://www.crystal.com
P.O. Box 17847; Austin, TX 78760
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Received on Tue Jun 23 16:04:52 1998