Grand Prix
Williams, 1976My dad was playing a game of Grand Prix, and mid-ball I noticed the backbox lights flicker, and then the flippers wouldn't activate. The ball drained and then would not serve into the shooter lane. All lights come on, but when I turn the machine off and back on and press the start button, nothing happens. The tilt light is NOT on, and I don't think there's any way he tilted while playing because he doesn't nudge.
Does anybody know what's going on here?
You'll need to see why the start button isn't working. Check to make sure there are credits on the game. Also, check the coin switches to make sure they are not stuck in the closed position... You can check to see if there is power at the start switch with a multimeter - set at AC 200 volt. If there is no power at the start button, clean the contacts on the reset relay and the score motor at the index stack/A position... If this doesn't work, we'll have to look at other switches in the start circuit...
The game is set to free play and also since the issue arose during a game, could the coin switches have caused this?
I don't have a DMM with me since this is at my parents' house, but I will visually inspect the fuses and see if anything comes up.
Yep, sounds like something shorted somewhere. Try unplugging the playfield and starting a game. It should start even without a playfield. That will narrow down your search area.
Well I had to leave my folks' house and won't be back til Christmas. Thinking it may be the bridge rectifier, I disconnected the AC leads and put in a new 15a fuse. Fuse still blew when I turned the game on. When I come back I will try disconnecting the playfield so thanks for the advice.
Quoted from jeffpm:Well I had to leave my folks' house and won't be back til Christmas. Thinking it may be the bridge rectifier, I disconnected the AC leads and put in a new 15a fuse. Fuse still blew when I turned the game on. When I come back I will try disconnecting the playfield so thanks for the advice.
The bridge rectifier has its own fuse.
You've got a shorted coil somewhere.
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Richmond, VA