Hi Folks, I'm re-assembling a Buckaroo. Gradually sorting out problems, and most features working and game playing this morning, but this afternoon .... switched on, counters zeroed etc, then immediately, the bucking horse 'bucked' and the coil is stuck on, buzzing very loudly. Switched off quick to save the coil. Tried rebooting, but same thing happens each time. I have the schematic but ... can anyone suggest why this might be happening, and point me to the physical location of any switches or whatever that need checking? Any suggestions / help will be much appreciated. Thank you!

Thanks folks. Yes, horse should kick every 100 points. There is a switch shown on the schematic, but difficult to know where it's located in the machine. Wire colours are faded. I was hoping someone would know. I'm not great at relating schematics to actual wiring. I think I'll disconnect the horse-kicker coil and check out what else is happening. Might make some progress over the weekend. Further suggestions appreciated. If no joy, I'll post some of the schematic.

Thanks folks - it was a switch on the "L" relay. One of the contacts was missing, and a previous owner had bent the switch leaves close together to make the thing work. It did for a while, but not reliably. I'm now fixing the switch. I'm working through some other problems, so you'll probably hear from me again soon! Pinhead: that looks like a very fine example.

switchL (resized).jpg