Supersonic
Zaccaria, 1977So Happy my Supersonic is actually now playing properly. Odd thing I see now, game never ends. 
Ball is set to 3 balls, last ball technically drains, but it kicks out into shooter lane again and you can just keep playing until what appears to be infinity.
Game registers "game over" on initial power up, it goes through its checks (resets ball count, score, then game over is lit), coin up and game starts and plays normal. Just watched my son play through at least 20 balls. 
Tim
Quoted from nagamitsu:last ball technically drains, but it kicks out into shooter lane again and you can just keep playing until what appears to be infinity.
Ok,if the ball count works proper except for the last ball that tells me to look at the game over trip.
Go to the schematic @ the index and see where its located @ [8/C-G] and back trace from it till i encounter the ball count unit,from there i see what triggers it to allow that G.o. relay to trip and its says a score motor cam @ [1-A] is what completes the path.
After locating→ Now follow the circuit from L→R @ outhole relay[m&b] →ball index re.→scr mtr 1-A→ zero wiper contact→game over re.[trip]
Things possible are the score motor sw.pulse [clean & gap] ← ←thats most likely it,or a dirty zero rivet on the ball count stepper wiper or a broken wire @ the zero circuit itself leading to or away from the B.c.unit → leading to the trip or the trip latch itself .
Not familiar with Zacc, but I resolved the same issue on a Gottlieb 2001 by shining up the rivets on the ball counter unit as Pin-it mentions. After tracing all kinds of leads, this proved to be the simple fix. There were rivets at the 3 and 5 ball position that were a little hard to see. A little brass cleaner and game over.
Ok, here's the status. I adjusted and cleaned the contact fingers on the ball count unit, it seems to be doing its job fine. Upon game power on, with ball in rest in outhole, the game shows/indicates "game over". Hit start button, game plays normal, upon drain of last ball (currently set to three balls), it doesn't register game over and it shoots ball back into shooter lane and you just keep on playing.
So the game seems, at least on first power up, to know to put the game into "game over" or it does certainly register this fine.
Tim
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Cambridge, ON
Sunbury, PA
