Hi all! This is my second EM, but the first one that needs service in the "logic" department (the other one was 100% mechanically, just needs a ton of cosmetic work).
So, here we have a 1971 Bally Four Million BC (SN 3410) that I recently bought from an arcade enthusiast, who admitted pinball was not his forte. He had the game for a year after purchasing it from a woman who had the game in her family for as long as she could remember. Sold it to me as is. Kicks out 2 balls at game start, game never ends. I figured out the 2 ball kickout already (Tar Pit thought it had a ball in it still, easy!) However, the infinite game makes it not-so challenging...
During my inital inspection, I have not found any hack jobs and all components appear to be intact and present. A couple coils have burnt paper, although all still function except for the "close flippers" solenoid. Poor thing looks like a spent firework, already ordered a replacement and verified the mechanism can be manually operated smoothly with no issue. I also intend to replace the other coils once they arrive.
Now, on to the real meat and potatoes:
Plug it in, flip the switch, and press the left flipper button and she comes to life in a "GAME OVER" state.
As soon as either the 1st or 3rd coin chute is triggered, a game starts (without pressing credit/start button). The results are the same if I manually fire the coin coils. If I neglect the coin chute, I can also manually press the credit coil to get up to all 4 players active. Issue is, I don't believe the game should start on coin chute, but on credit/start button press, correct? I've metered for continuity at the credit switch behind the coin door, the switch is not shorted and appears to function correctly, despite not activating anything.
Once the credit is activated, the score reels reset, player 1 is illuminated, and a ball is kicked out. Plunge the ball and score some points, except the Ball Count does not illuminate. Ball Step Up Unit (correct terminology?) Is functioning, unit moves to all positions without manual interference, however, Ball Count is not reflected by the lights in the back box.
After a ball is drained (on multiplayer) the next player is lit and a ball is kicked out. However, the game is infinite, never reaching a "GAME OVER" state.
I'm starting to suspect either contacts on the ball count step up unit (although the leafs appear to be making physical contact) or an issue further down the line.
Tl;dr: Game starts on coin chute and does not ever end...infinite drains!
Any advice is appreciated, thank you in advance!