Being sequestered at home, I decided to attack a long-standing problem with my Segasa Monaco. This problem has existed since I acquired it 2 years ago. I’ve treated it as a one-player machine since then, and in that configuration it works fine.
When you pick 2, 3 or 4 players, the ball count increments before the last player completes her ball. Specifically, the ball count stepper fires *not only* when the last player completes her ball, but when the *next to last player* completes her ball.
In a 2-player game, the ball count increments after every ball for every player.
In a 3-player game, the ball count increments at the end of player 2’s ball *and* at the end of player 3’s ball. By the time player 1 steps back to the machine, she’s on ball 3.
In a 4-player game, the ball count increments at the end of player 3’s ball *and* at the end of player 4’s ball.
I have putzed around with this problem a little bit. I first thought that the coin unit might be straddling two player positions, permitting conductivity across more than one of the current paths between the coin unit and the player unit. I checked that by ohming out the R-W wire with each of the wires BLU-R, R-Y and R-G (which I understand to correspond to the 1-player, 2-player, and 3-player scenarios. Confirmed that for each position of the coin stepper, only one (the correct one) of those wires has continuity with the R-W wire. So I seem to have ruled that out. And, by inspection, the coin unit is well-centered so that the stepper appears to touch only one position at a time.
I then thought that the player unit could be straddling positions. I checked that in a similar way: ohmed out the BLU-R wire that goes to the “A” position on the player unit against the R-Y, R-G, and R-W wires (B, C, and D) which I understand correspond to players 2, 3 and 4. Again, everything seems to track correctly as I move the player unit- in the player 1 position, none of the other three wires has continuity with BLU-R. For each subsequent position, only the wire associated with that player has continuity with BLU-R. And by inspection, the player unit appears well-centered so that snowshoes are dead-center on the contacts they're touching.
So, my initial hypotheses have come back dry. That doesn’t mean there’s not something wrong with the coin or player unit- just that I can’t find it.
My subsequent hypotheses start to get weird. Perhaps there’s a timing issue with the stepper motor, where the impulse 1-B comes too early or too late, and straddles two player positions. But an inspection of the score motor shows that the 1 wheel and the 2 wheel (which furnishes the impulse to the player unit, 2-B) appear to be separated by a reasonable factoryish margin.