I'm trying to help a friend get his Star Pool up and running, and we've made good progress. But I'm stumped with the current problem and could use an explanation of how Williams machines go from player to player in multiple-player games, or just stay on 1 player in single-player games.
The symptom is: We start a single-player game (one push of the credit button after turning on the machine), the lights on the backglass stay at the "1 player can play" position and the credit unit does stay in the correct position. First ball scores correctly for player one, then when the ball drains, it acts as if a 4-player game is in progress - it correctly (for a 4-player game) goes to player2/ball 1, player 3/ball 1, player 4/ball 1, then player 1/ ball 2, etc. The ball count unit seems to be working correctly...the game just acts as if we're playing a 4-player game all the time. The game ends correctly when all 4 players have finished.
We've cleaned the steppers and they are moving freely. I think the coin unit and player unit are the 2 that would be involved here. There were some issues with the pegs that open/close zero pos. switches on the rotating gear being on the wrong side of the switches - that sort of thing, but I think everything is in the right position now....I think.
We've also cleaned the contacts on all the relays and watched them opening/closing as the armatures move - they seem to be making contact/opening as they should.
I'm more familiar with Gottliebs and how on a single-player game, the player unit gets enough pulses to quickly cycle through all the other players and get back to player 1. I can't tell from the schematic whether this machine is supposed to do that, or does the player unit just stay in one position, or does it get a pulse to reset...? If that's the case, could it be the highlighted switch on the snippet?
Here's a link to the full schematic (it's on IPDB, so I assume there aren't any copyright issues) - hopefully, this link will work:
I've been trying unsuccessfully to figure out how that part of the machine works. If someone has the time and patience to explain how the machine determines which player is active on both single and multiple player games, that would help me pinpoint the problem. I know that will be a bunch of writing for someone, so thank you in advance.