Baby Pacman Ghost on screen

dandydan1959

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Hi,
I have a Baby Pacman with two issues. the first is that there during game play I can see flashes of partial characters in the top center of the screen. The game screen is complete but the partial characters flash up and then are gone very rapidly.

The second issue is that flippers. The flippers have 43 volts on the contacts but do not energize when I push the buttons to energize them. I am looking at the control circuit for this and think I can figure it out but if you have dealt with this let me know.
Thanks
Dan
 
Its been a while since I looked at one of these but check the schematics. If you have your 43v then you need to verify the switches that trigger the coil(s) in question are working. If they check out I think there are some transistors on the board that control these.
As far as your graphics problem you likely have some acid damage on the mpu that needs to be addressed. Alot of times even if you cant see it the problem will be in the sockets. It could very well be acid damage on the vidiot board too. Suspect area is right down the center of the board where the acid leaks down from the battery. Pull the chips and if you see green on the sockets terminals the sockets need to be replaced.
 
baby pac flipper fix

Hi,

Found the pin for flipper enable input on J9 had a cold solder joint. Cleaned and soldered joint.

The ghost thing is the next issue to address. I will start to replace a socket at a time until I find the issue.
Thanks for the help.
Dan
 
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