Pac Man not lining up at bottom

KellyB

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Have a Pac Man that was working fine. I took the benzel and smoke glass out and cleaned them and the monitor screen. When I put everything back and started the machine the pac man wasn't lining up with the dots on the bottom half of the screen. It lines up fine with the top half but is about an inch above at the bottom. The dots disappear as he moves along but he's not in line with them. Would cleaning the screen have anything to do with that or is this caused by something different and how can I correct it? Thanks in advance for any help.
Kellly
 
Cleaning shouldn't cause an issue (unless you smothered the screen with windex while it was on and it dripped over onto something with voltage applied - that usually doesn't happen even when cleaning it while on).

Let's see a pic of your problem...
 
Here are a couple of pics. Notice how pac man is in the blue bar instead of in the lanes.
 

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Something has wiggled loose. Did you have to move the machine away from the wall to get the back door off to clean it?

Moving the machine to open in has jarred something loose on the game board.

Start with the edge connector. Make sure you have a nice tight fit where it plugs into the board.

If that doesn't clear up your issue, then you need to look at the socketed chips on your board. Something needs to be pulled and reinserted, but first just try and push down on them to see if the problem clears up.

This looks to me like a rom chip needs re-seating.
 
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