Question...

Have a Bally Playboy that plays just fine, if there is no sound board connected.

But, when I connect the sound board, the coils all fire incorrectly. Like when the ball trough eject is supposed to fire, instead the right slingshot fires. When the top left pop bumper is supposed to fire, instead the top right pop bumper fires.

Then I unplug the sound board and all is fine.

Is this a common thing and there is a simple fix for this? Or a common place to investigate first?

By the way, the sound board is a new one from nvram.weebly.com. https://nvram.weebly.com/bally--32--50.html

Thanks!