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I am on a roll! I actually know where this is on the board, and I have the parts! Huzzah lolOk. That's good, as it means it's an input problem, which narrows down what it could be (compared to if it was resetting, which would be a larger set of possibilities).
This is the area of the schematics that is applicable in this case:
View attachment 817458
The first thing I'd suspect are one of those caps (C72/74/76). Those are small, usually glass caps on these, and they can go bad, causing unstable inputs. They become resistive, which messes up the divider circuit that is implemented by the other 1K and 470 ohm resistors for each input.
You can test the caps for resistance, and compare to the adjacent ones. You may need to lift one leg to get an accurate reading. But you'll have to figure out which one corresponds to the coin slot that is misbehaving. (Assuming only one of the inputs is what's acting up, and causing the counter to count). You could also just replace all three, and see if the problem goes away. But you can do better than that in terms of isolating the bad part first.
If it isn't any of that, R11 itself could be bad. But I'd start with those caps.
Thanks guys! That's the last thing before the Battle zone is in perfect condition as far as I know. Gonna pretend the slightly wiggly text is no big deal lol
