Here we go again.
Another rotten dog f**k up
this time its a replacement power supply / solenoid driver board

the 2 mistakes i found is:
A: the led for the high voltage section grounds to the +5 power supply ground. problem being if you have a bad connection on the ground for the 5 volt supply it feeds 180 volts Via the led and a resistor to the ground on the +5 circuit and gives you the impression that there is no +180 volts for the displays.
Plus it reverses the polarity for all the I.C,s on the power supply board.

Then you have J4 PIN 8 for the flipper control relay, no pull down resistor so if you have a bad connection to J4 pin 8 you will have a oscillating flipper control relay.

I will post the upgrades to get rid of these potential problems soon

   

I have had few minor issues with the Rottendog boards but I'm not an electronics engineer so if it works then I'm happy.

As per the title of this thread the BPS018 is a Bally / Stern Power Rectifier board. http://www.rottendog.us/BPS018.htm

The schematics are here -http://www.rottendog.us/Schematics/BPS018.pdf

I'm not sure I can follow where the problem is, I'm guessing its a different board you are referring to?