Tempest vector distortion

Hello,

We have a small arcade at work, and I recently got the cabaret Tempest machine
there to work again. Basically I just pulled the logic board and reseated all
the socketed chips and the interboard connector cable.

It now comes up, stays up, and shaking the cabinet doesn't cause the game to
crash. However, I'm seeing some vector distortion. When it displays the
TEMPEST logo in the attract mode mode, near the end of the animation, the
vectors foldover, and then (mostly) return to normal. You can see a video
of it here:

   http://www.scrapheap.net/tempest/

Also, on some levels (in particular, the one I call the staircase level)
straight lines get drawn with a definite curve in them, and the screen tends
to pulsate a bit with the size of the image growing larger and smaller. My
first reaction is I need to work on the monitor, but then I thought maybe I
need to adjust the X and Y size and position pots on the logic board.

I also see some faint lines which I assume are the beam location being moved
with the beam turned off. I assume I fix this by adjusting the screen
brightness.

Suggestions anyone?

Thanks in advance for your help!

___
Ken
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Received on Tue Aug 9 18:15:08 2011