Williams Flash. Serial No 375985, Built 1979. Early system 6 cpu. Replaced large filter cap on backbox floor & minor switches etc. in the past. Working, smelled electronic burning & turned off. On switch on only GI and Sound. Nothing else. Have manuals and checked power supply voltages, cpu test points, Diodes D7/8, fuses, rectifiers, cpu test LEDs. All nominal except TP4 at 0 VDC and F2 (replaced). Scores, attract mode, flippers, solenoids do not work. Does not seem to reset. Have more detailed test results if required. Any suggestions?

It is not a solid state machine. I can move it there but I thought it fit better in EM forum. Additional thoughts. When I smelled the burn it was in Attract mode, not play mode. I think the odor came from overheated 3 watt resistors on the driver board. They show signs of overheating. But I don't think this was the primary problem of no reset. Jack

Thanks to all the pinsiders. Great response even though I placed it in the wrong forum. I honestly thought it was EM but glad to know otherwise. I thought Solid State were only video games. Shows how little I know! I will redo the boards as suggested by several members and see what happens then. And I will post it in Solid State.