I'm a first timer working on repairing a Gottlieb Royal Guard (1968) pinball that I bought broken. Apparently it had been sitting in some guys garage for a long time, so I've been working through cleaning all the contacts but I seem to have run up against a weird issue. As I understand it - according to the pinrepair website, I'm supposed to plug this thing in, then hit the start button, then (assuming credits) it runs though the startup sequence that has to do with resetting all the reels and banks and whatnot, then it settles down, then you can play.
What happens in my case is I have the coin thing completely unconnected from the rest of the machine, then I plug the machine in to the wall and the score motor starts, actually does reset all the reels and such (aside from the credit reel?), and keeps going. I also have an on/off switch that the machine apparently ignores.
So, I kind of wanted to address the coin slot thing - from what I've read on pinrepair the thing isn't even supposed to start without the coin slot connected to the rest of the machine so I'm not sure what is going on here. It is most definitely completely disconnected from the machine at large, so all I can think of is that there is a wire crossed somewhere that makes the machine think that someone is constantly hitting the start button. It does this regardless of whether there are credits on the credit reel at time of plug-in, though.
I've been reasonably diligent in following the pinrepair site, so I do know that my reels and score counters are all clean and mobile (although the reset sequence does not make the score counters reset as of now), and I am working through things like trying to hunt down the 'home switch' on the score motor to make sure it is clean and comfy (I definitely don't see blue sparks with the light off as it runs so I'm thinking this may be one of the issues at hand). However, I really haven't been able to find a reference or similar problem where the machine has nothing but callous disregard for the coin slot/start button and ignores the on/off switch, so I was hoping for some advice here while I chug along on cleaning and working at the rest of the machine.
My schematic is on the way, but I live in Canada so it is going to be a while.
The only major repairs I have done is replacing the power cord and on/off switch (both had more or less disintegrated with age).
As near as I can figure, the machine isn't set for freeplay.