Let's go back to the score motor for a moment. I took the legend from the schematic and turned it sideways-- it helps me wrap my head around what should be open and what should be closed. My understanding has always been that the conditions shown on the schematic are when the game has been started, it's ready to play, and there is no score yet.
Quoted from MarkG:
- pushing the Replay button (if there's credit), or dropping a coin should trip the Start Trip relay
If your Trip Relay bank isn't resetting your Score Motor is probably running because the Start Trip relay switch is closed.
You might be on to something here. I've been working on this assuming that the relay was supposed to unlatch. Instead, are you referring to the switch on the right at the top of the middle photo? If so, that would explain why my credit button doesn't do anything! Would that also explain the difference between in response between the two coin switches (they are unmarked, and the escutcheons are missing from the lock bar, so I'm not sure which is .10 and which is .25-- I'll have to see if I can figure that out by the wire colors this evening). If we've been chasing our tails over that, I'm going to be pretty upset with myself for not figuring that out earlier! Now to figure out where that switch actually *is*. There's a lot going on in this circuit... any thoughts on how to best troubleshoot?
The last photo is something I found last night in with the original schematic. I've been using the IPDB one, because my original is pretty well mouse-eaten. This document may or may not be helpful, but at least it tells us what each of the score motor switches does without having to decipher the schematic each time.