Hi cyberkni
when the problems are: Can I start and play a 1-player-game ? Can I start and play a 2-player-game ? Can I start a 3, 4-player-game ? --- when the focus is on these questions: I prefer starting the games by using the "Replay-Button" in the front of the pin (near the player).
The reason is: Every pin does the start "using the Replay-Button" the same way.
When we use the Coin-Slots: Some pins only have ONE Coin-Chute and so ONE XX-Cent-Relay --- Some pins have TWO ... --- Some pins have THREE ...
AND: Some pins have the feature "TWO coins are needed to start a game", AND: Some pins may ONLY step-up the Credit-Wheel - others do the step-up and start a game, some do only start a game. Question: Can YOU start a game by using the Replay-Button ?
In Your post-6 I read "Can start a ONE-Player-Game and play it" - cannot start a TWO-Player-Game --- BUT when I manually step-up the Coin-Unit: THEN I can play a 2-Player-Game - question: Do I read right ?
See the JPG - the pin is in state Game-Over, points are on the Score-Drums. (Marked orange stuff) Pushing the Replay-Button does activate the Credit-Relay, the Credit-Relay activates the Coin-Relay, pulling Coin-Relay activates the Reset-Relay, also lets the Score-Motor run.
Shortly after that the turning Score-Motor reaches position-3 - NOW a shot of electricity is fired: "Closed-Switch on pulling Coin-Relay", "closed Switch Score-Motor-3-B, "moved Make-and-Brake-Switch on pulling Reset-Relay" --- the shot of electricity reaches "Coin-Unit, Ball-Count-Unit, Player-Unit" - they do RESET.
More stuff is done in resetting - finally the ball is kicked over to the Shooter-Alley - pin is ready for a ONE-Player-Game.
You press again the Replay-Button --- Credit-Relay, Coin-Relay, Score-Motor, Reset-Relay pulls-in and a tenth of a second later Reset-Relay let go (as there is nothing to reset , Score-Drums ARE already resetted). NOW a shot of electricity is fired: "Closed-Switch on pulling Coin-Relay", "closed Switch Score-Motor-3-B, "NOT moved Make-and-Brake-Switch on Reset-Relay - as the relay is NOT pulling" --- the shot of electricity reaches "Coin-Unit STEP-UP-Coil" - and so the pin is ready for a 2-Player-Game.
So You should inspect the (encircled orange) "Make-and-Brake-Switch on Reset-Relay" for connectivity wire-W-BR (through switch) to wire-R-B.
No Luck ??? If No Luck: Want to try the functionality of "Coin-Unit-Step-UP-COIL" by using a Jumper-Wire ? Clip-on at "Lug on Step-UP-Coil, side "wire-R-B is soldered-on". Take the other end of the Jumper-Wire NEAR "transformer-lug-YELLOW" - lay it down NOT touching metal.
Start a game ... pin comes to idle - NOW take the Jumper-Wire and tip its gator-clip onto "transformer-lug-YELLOW" - question: Does the Step-UP-coil fires ? Greetings Rolf
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