I got this machine from a friend who wasn't looking for this level of project. I've already cleaned and cleared the playfield (not the best of jobs, but it's smooth and passes the 5 foot test) and am now putting things back together. The game didn't work when I got it and he got it from a storage situation, so if I made anything worse, I wouldn't even know at this point.
So, the PF is cleared and back in the cab and everything I unsoldered to have a flat surface has been soldered back in place. The only burnt fuse was the 6V, 15A one. Replaced that with the closest thing available, which was what had been in there before and was blown (32V, 15A). The right slingshot coil locked on upon power up and manually activating the lock relay. Tap the bottom of the cab (cool feature) and see that one of the slingshot switches are touching, but not at the contacts. Fix that and that no longer locks on. I have a new relay coming, but will manually activate for now to identify trouble spots.
When the game is powered up there are two things I am currently noticing. The first is the 10,000 stepper is constantly running. The second thing is I am still hearing the hum of a locked coil. I ID that coil and tap the game off. The 10k stepper gear thing isn't spinning freely at all. Take that apart, clean it, reassemble and now it's acting proper. Power the game up, and it still spins and spins. I don't let it do this for more than a few seconds so the locked coil doesn't fry, but I have powered up a few times, so it should have found home by now. It's a continuous stepper, so no switch. Still a mystery, but likely related to something else at this point.
Now, the real question I have at this point is the "Selection Unit" stepper under the back left section of the playfield. It's locked on and I can't figure out why. It has a single coil and a switch on one side and the expected grid of wires on the other side. It's locked on, but with a name like "Selection Unit" I have no idea what it's related to. There are no schematics for this game that I found, but a Ten Spot schematic (http://mirror2.ipdb.org/files/2517/TenSpotSchematic.pdf) shows it doing to several "1 to 10 lite relay" tags. Curious if mine does the same. Either way, anyone have any ideas why it would be locked on?