Hi there,
I have a Pharaoh pinball machine, bought quite a while ago. More recently I had to replace the MPU and Driver boards. I got replacements from Kohout, those didn't work so they replaced those. Sadly it's beyond warranty now. The power supply, sound, and display boards are stock.
Symptoms: no solenoids work, except flippers and relays. IC1 gets very warm. In solenoid test almost all leds in array for "solenoid driver 1/2" blink for each failed solenoid tested, when a relay is activated, only the correct led on array lights. The LEDs for flipper driver stay on. Background music stops after 5 seconds. It forgot settings, although doesn't require battery. Knightside witnessed this too.
Dx: I triple checked the DIP switches. nReset and blanking LEDs are on as they should. Board dx will return a "0" although on occasion has returned "9". Switches seem to work.
I think the MPU board is bad.
Thanks,
Mattwesterville