Location: Broomfield, Colorado
Symptom: Not powering up, not working.
This pinball machine is located in a youth center in a church basement. No one seemed to know much about it, other than it was probably donated. So it was unknown when it last worked.
Given the age of the machine, before powering it up, I checked the mechanical operation of all of the steppers and visually checked the contacts on the relays and score motor cams. Several of the steppers were gummed up, but the rest were in good condition. I rebuilt the steppers and fixed the left slingshot linkage which was binding.
We had to drill out the lock in the back box because no one had a key and we couldn’t find one in the machine.
Once all of the mechanical parts were working freely, I powered it up. The machine would get stuck in continuous reset mode. The reset cycle description in the manual was nearly incomprehensible. So I was on my own.
I checked all of the obvious things, like the score reels resetting to zero, the ball count stepper unit, player count stepper unit, etc. Everything was being reset and all reset switches were working. The only weird thing was the credit stepper was stepping up to the maximum allowed credits during reset, when it should be subtracting 1 credit.
It occurred to me to check the coin switches, which I hadn’t checked earlier. They were a mess. I think someone thought they could get freeplay mode by bending all of the contacts together on both coin inputs. Once I got the switch wires and contacts untangled, the machine would reset properly.
I bent the switch contacts on the credit unit to give free plays.
After that, there was still some minor tuning needed and got 98% of it working well. I discovered a broken switch contact on the Spinner Advance Stepper (EOS). It was broken right at the insulator which prevented me from soldering another contact on. I am currently researching a replacement switch or contact.
I will update when this is done.