I run Flipside , a marketplace for pinball machines here in Australia. A while ago I added a free repair assistant to it: you describe the fault, it reads the service manuals for your machine and tells you what to check, with the page it got it from. It's at joinflipside.com.au/repair if you want to have a play. If you've never opened a pinball manual, they're thick. Switch matrices, coil tables, fuse charts, schematics, voltages at every test point. Most of them are old scans. When someth...