Working on a Monte Carlo (Bally, 1973).

The ball won't eject from odds hole, it stays there and the points increase forever (or until I manually remove the ball). The evens hole works as it should (which means that 7C-SCM can't be the problem).

I have cleaned and adjusted the odds hole switch. I have done the same with the odds hole relay (difficult to reach).

Since the evens hole works, I dont believe that 1C-SCM or 10C-SCM can be the problem.

Any advice?

Odds hole eject (resized).jpg

I checked the resistance of the coil and compared it to the evens hole coil: 13.0 ohms and 11.8 ohms. So, no problem there.

I resoldered the lugs of the coil, but that didn't help.

Finally, I cleaned and micro-adjusted the relay switch once more (still hard to reach) - and that did the trick!

Next "problem": I want the top and lower gates to close after having been passed. How is this done?

Yeah, that's the way it's supposed to work (and my machine works that way) but the film shows a "mod" and I was just curious how it's done.

Yes, you are right. I will skip this mod. The games are short enough already, no need to make the game even more difficult.

I have discovered a new problem:

The Game over lamps won't light up when they are supposed to. The lamps and lamp holders are ok but voltage isn't there after a game is over.

I have cleaned and adjusted the game over relay but that didn't help.

I have measured the resistance between the relay and the lamp holders (blue/yellow wire) and it's 2.3 ohms (should be zero).

Any advice?

Game over lamps - 1 (resized).jpg

Game over lamps - 2 (resized).jpg

Game over lamps - 3 (resized).jpg

Game over lamps - 4 (resized).jpg

One problem with the schematics is to find the correct wires and switches in the game itself. Things that are close to each other in the machine can be far away from each other in the schematics.

I believe that I have found places 1 and 2 (see images below). Am I correct? If so, it is very odd that the resistance is 2.3 ohms between 1 and 2, not zero.

Game over lamps - 4b (resized).jpg

Game over lamps - 3b (resized).jpg

Game over lamps - 1b (resized).jpg

One problem with the schematics is to find the correct wires and switches in the game itself. Things that are close to each other in the machine can be far away from each other in the schematics.

I believe that I have found places 1 and 2 (see images below). Am I correct? If so, it is very odd that the resistance is 2.3 ohms between 1 and 2, not zero.

Game over lamps - 4b (resized).jpg

Game over lamps - 3b (resized).jpg

Game over lamps - 1b (resized).jpg

After 2 hours of testing, measuring, cleaning and adjusting, the game over lamps suddenly work! I don't know what did it...

Having mixed feelings right now: frustrated and relieved at the same time.

Thanks everybody!

It might have been removing and putting back the jones plugs in the backbox...