This is my first pinball machine. I bought it yesterday knowing that it didn't play, but the problem sounded minor as the person selling said that the only problem he knew of was that the ball wouldn't load. It powers on just fine (sort of), lights up, flippers and bumpers work, score reel spins, but the machine immediately starts to give out credits . Once it hits its credit limit, the replay knocker stops.

I started by opening coin mech just to see that everything was in order. I found one of the triggers to be completely mangled, but even so, the switch was in it's default position so I assumed this wasn't causing the problem. Regardless, I straighten out the wire and made it functional.

Next, I go to the back box thinking that if I change the PLAY ADJUSTMENT setting to 'EXTRA BALL' instead of 'CREDIT', I can at least stop the constant knocking that comes with a replay... nope, no effect. I next turned the NUMBER MATCH ADJUSTMENT to 'OFF'... again, no effect.

I plan on digging into the schematic today once I get home, but figured I'd throw this out there to see what everybody here might know about my problems.

The wire on the other side (only 2 coin slots) along with the switch looked to be in perfect working order. It's hard to verify functionality however when the machine is continuously giving free games. I guess I rules out the coin mech from the get-go since the machine wouldn't pop when a coin activates a credit.

Tonight, I plan on looking at features on the playfield that will issue a replay and check the condition of the relay/switches there. If nothing pops out as abnormal, I'm kind of at a loss. I guess I then just start systematically going through each and every coil/relay/switch with my DMM to ensure proper function of each element... something I should probably do anyway.

Being a complete newb to all of this, I welcome any pointers/advice any of you might have. Thanks.