Ms. Pac. Vertical foldover

jmack

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I have vertical foldover on my dear ms pac. I replaced the caps, transformer, fuses and everything that comes in the Bob Roberts Super repair kit. Does anyone have any ideas? Thanks
 
Thanks, but i tried that. I'm afraid I may have shorted something when I saw the little blue spark as I was pullling the board....with the machine turned on. yes. I did it. Didn't get bit though. Any ideas on how to address my picture? Half of the top of the screen appears to be covering about 1/2 of the bottom.
 
You removed the monitor board with the game turned on? I don't know where to begin telling you what is wrong with that. The monitor in a Ms. Pac is rotated 90 degrees from the normal position. So, vertical foldover presents as a portion of the image on the right or left side folded over itself. What you are describing sounds more like the horizontal is not synced up right. If it won't adjust via the horizontal hold pot, make sure that the 3 pin sync connector from the video wiring is plugged in correctly. Also, it might help if you post a pic of the monitor image for us.
 
ms pac foldover

see attached pic of mis pac foldover.
 

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That would be vertical collapse, time to rebuild the monitor

I agree with the rebuild, but wouldn't that technically be a horizontal issue? the top and bottom are squished into the center of a vertically mounted monitor...
 
Wouldn't the horizontal width coil adjust that out? It's been a while since I messed with one but I thought if the width coil was too far in one direction you would get that type of screen drawn.
 
It's possible there is a problem with with coil, but I don't usually see overlapping in the picture simply from adjusting it too far each way. Even with the core being gone it doesn't looks like that...
 
Thanks everyone but I tried a different chassis that needs caps replaced but I at least got a full picture, ie no collapse.
 
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