Ramtek Clean Sweep question

stutrac

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Donor 2012
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game runs on +5 and -5, i tried to install a modern switcher and after 3 mins on switcher shuts off,(all voltage in and out are correct), i unplug game and in 2 min i plug in game again and it works,( bright clean pic). then i removed and installed the orig power supply.
i rebuilt the orig power supply, game plays fine on +5 the issue is -5 that runs the score and paddle the score's pixel's slowly disappear and the same as the paddle, the pixel's fade in and out,(each dot then all go out on score and paddle), i have sound, game coins up fine, all controls work.

so the question is why do pixels fade??? and the -5 issue?? and i can not use a modern switcher??
 
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