Juno First Odd Pixel line across screen

Malice95

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So I have a Juno First.. game works great.. but its got a minor issue thats
bugging me.

In the middle of the screen there is a horizontal line, multiple pixels thick
that randomly extends across the screen.. Its segemnted sorta. As the game
plays the portions of the line come and go and the color of the pixels used change.
Sometimes its just a few small blocks across the screen.. other times its approaching
a solid line.

Example:

"- -- ---- - - ---- - - "

Any idea what could be causing this? Some sort of video corruption? Perhaps failing
video ram? This board is really rare so I cant just pick up another one.

Where would you start? Does anyone work on Gottlib games like this?

Thanks,
Mike
 
Sounds like the video RAM. JF uses the problematic 4116 RAM (like Williams boards). Make sure your voltages (all three: +5, +12, and -5) at the board are all good. Unlike Williams boards, the RAM is unlikely to be socketed. :(
 
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