I have found a great looking Space Riders at an excellent price. the pin powers up, lights come on, coils check, and it makes sounds - don't know if it is the right sounds - but it will not start a game. I have never worked on an Atari so don't really know what I am getting in to or what to look for on the PCBs. I am guessing most board component parts are available? The schematics are available on the internet pinball database.
Any advice would be greatly appreciated.