So I am checking the switch assemblies under the playfield of OXO last night, triggering them manually to get a sense of which swtiches need adjustment. All of a sudden the center coil of the chime assmebly starts smoking and bursts into flames. I unplug the game and blow the fire out and cut one of the wires to the burnt coil. Disconnected the chime assembly.
What did I learn?
When I first looked under the playfield, I had noticed that two of the coils in the chime assembly had no plungers. Didn't think much of that until the fire.
Now I realize, without a plunger to act on, I could not know that the switch activating the coil was stuck on until the coil fritzed. Thought that a loud buzzing might have occurred but didn't.
I guess this has never come up before since this game is the first I have gotten that needs time in the IC.
Dan