Hey guys. So I recently acquired a Bobby Orr's Power play, and have been restoring many of the non functioning parts over the past couple of weeks. I noticed the extra chime does not work, and inspected the coil to find it completely burned out. (the outside of the coil was blackened). So I went ahead and ordered a new coil, and when it arrived I checked its resistance (which was 56 ohms, an acceptable resistance for this specific coil.) I then soldered the leads of the coil (with the diode facing in the same direction as the old coil) to the wires the old coil was previously soldered to, let the solder cool off for about 10 minutes, and turned on the machine. I then started the game, which is supposed to set off all 4 chimes in a lovely sequence, to find that the new coil does not fire at all (the other 3 coils are still working fine). I then placed my hand on the new coil and it felt extremely hot to the touch, and had heated up to such a hot temperature in only a few seconds. I immediately unplugged my machine and cut the wires off of the leads of the new coil, as I didn't want to cause damage to my board or cause a fire of some sort. Does anyone have any idea what may be the problem here? The coil is brand new, so I don't understand why it's not firing, and is instead overheating very hot very quickly.

Hmm okay. So you're suggesting a bad transistor on the solenoid driver? I have a pdf of the manual as well as schematics. When I checked that circuit at the wires for voltage it read around 50V, which seems correct to me.

My test mode button used to work, but it quit working after I installed an NVRAM chip and took out the nicad battery. But I'll replace the transistor regardless as well as the diode.

EDIT:
Test button was working, I just wasn't pushing hard enough.

Just to clarify, which connectors are you referring to?

I ran the switch test and a "0" is displayed, so the chime coil is not engaged.