Hello to all!

I have an odd problem with my (Williams) Grand Prix.

The machine was working fine, turned it off for the day, next day went back to turn it on and I was not able to start a game, everything is lit (as usual) the machine have plenty of credits on the credit wheel, but nothing happen when I press the "start game" button.

I was able to start a one player game by manually taking off one credit from the credit wheel by manually pushing the coil on the stepper unit; also I was able to start multi-player games depending of the times I manually push the coil. I'm able to add credits without problem (and as usual) at the coin door by triggering the coins switches.

Any ideas on where to start? It's just odd that -out of the blue- this issue happened... well, it's a +40 y/o EM.

Thanks for your reply! I'll take a deeper look at the diagram and follow the path of the "start button", but still tricky for me.

I will take at the credit unit, they seemed fine, this machine used to be on "free play" so I readjusted the leafs based on this URL:

http://www.pinrepair.com/em/index3.htm#free

Obviously I did it backwards.

Thanks!

~ja

Yes, these are clean, along with its cables.

Dr_of_Style & Rufessor, you guys nailed it! Thanks...!

The issue was at the credit switch, the top leaf/switch was barely close, not enough to make a "strong" contact and make the "start button" functional, a quick clean and adjustment to the switch and voila! I was able to rip the spinners again!

Thanks much guys! Case closed!

~ja