D2k problem, screen gets garbled

tron guy

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Donor 12 years: 2011, 2015-2025
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Ever since I got this machine from vegas a few months ago, it has had a problem intermittently.

It only appears when I play D2K.
The graphics start to get squiggly, or odd, and then it goes into all zero's or x's.
Doesn't happen during donkey kong play.

I have removed the z80(I think it's called) reseated the chips.

what's the next logical move?
I was getting ready to load her up and make a trade with someone, but I would like to fix
this or call the trade off until I do.
 
I am going to go check voltages right now.

Assuming they are off, is there a way to adjust this particular power supply?
 
You have to pull it apart but it has four adjustment pots inside, normally they are blue in color, they're labled on the PCB as to what one does what. I believe the top left one is +5v but don't quote me on that.

Did you pull the daughter card and re-seat it ? be careful not to flex the board too much when or if you do it.
 
ok I went through and checked several of the voltages.
all of the +5 that I tested came up +5.10
all of the -5 that I tested came up -5.15
the +12 came up came up +11.86 or 11.9
the +24 came up +23.6
 
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