I’m working on a 1967 Williams Magic City. It was in storage for 25 years. So it is dirty and grimy but is a diamond in the rough. So I have cleaned every switch, tested every coil, fixed a couple of bad solder connections etc. So it is looking pretty good but I have a problem that I cannot seem to solve.
If I plug the machine in and hit the left flipper button, the playfield and the back glass light up perfectly. The lock relay is engaged and the game over relay is activated just like it is supposed to. So far, so good. However, when I start a game, the motor keeps running. Yes, a common problem but here is the weird thing: the entire startup sequence completes. Everything does exactly what it is supposed to, the score reels zero out, all the zero switches on the score reels are open, the reset relay fires and all the Switches that control the m,a,g,i,c,c,I,t,y targets reset perfectly. Everything on the playfield operates perfectly. But the motor won’t turn off.
I have a schematic and have checked every switch for proper operation and settings. Every switch on the motor cams are clean and set correctly including the home switch. But the motor continues to run. The last step of the startup process is the outhole kicker pushing the ball into the shooter lane. All of this happens perfectly. But the motor won’t shut off!
I have tried everything that I can think of and am out of ideas. The ball counter unit works perfect, the match component works perfectly, everything scores perfectly. Like I said, everything has been meticulously cleaned and tested. There is no bonus unit on this game as it doesn’t have a bonus feature. Also should note, the coin mechs are gone on this machine so nothing plugged in to the Jones plug for the coin mechs. It is set for free play and the machine worked fine when it was stored those many years ago.
Any ideas? Something must be still sending power to the motor. Should I take the wire harnesses apart and look for wires touching or something? Or do you think I have a cold solder joint somewhere that I just cant see? How can I test for this? I have a dmm and know how to use it…….
Thanks for your comments, questions, and suggestions. I’m starting to think this machine is haunted.