1971 gottlieb Four Square.. Need Assistance please.

elnuno71

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1971 gottlieb Four Square.. Need Assistance please.

I bought a gottlieb four square em pin some time back.I thought it would make a good project, with some research i been able to bring the game to life but it wont keep score. I spent most of today cleaning contacts but feel im at a dead end. I would appreciate any assiatance... thanks.
 
Could you give a little more detail of what happens.

I would start by checking/cleaning the Jones plugs that connect the backbox wiring to the base.
 
When i first plugged it in at home it wouldnt credit up. After looking up some sites i manually tested relays and they were making contact. I cleaned switches on the motor drum and then the game would reset. After the control bank switches were filed the game credited up and seems to be operating normally. I can turned it on flic the coin switch hit the start button and ball kicks out to launch chute. Reading your post i missed some jones plugs near the power supply and gave em a half ass cleaning. I can manually make the thousand unit turn now.. couldnt do that before.. but as for any kind of scoring while in game play theres nothing. Im gonna spend more time on those jones plugs for now and see if any changes occur. Thanks for your response and appoligize for vague description. This is my first em project and im barely learning the fundamentals but so far its coming along.
 
I can engage the thousand unit to change value by manually hitting relay so the score is 1k or 9k. When i start the game the score will reset to zero. That gives me an indication that it does work but just wont keep score during normal game operation.
 
Got the one unit, hundred, and thousand unit to keep score..ten unit still down.. this things is almost 100%. Discovered a crispy coil on one of the bumpers that scores 10 points that might be my problem, picking up spare parts at my buddys em graveyard tomorrow. Will post pics tomorrow.
 
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