So my Robocop had a really annoying, constant buzz from the speakers. Not the usual hum that follows the attract pattern of the playfield lights, but a constant, angry buzz. Looked around for solutions and stumbled upon a Pinside thread regarding solving said issue. The thread was a few years old and listed a bunch of suggestions; tightening mounting screws, floating grounds, repinning connectors, relocating wires, and a host of other things. Tried everything and nothing solved the problem. Finally tried the last suggestion of adding an "isolated" power supply for the sound board. Didn't like the idea, but figured it was better than dealing with the stupid hum. Well, it worked. Figured I'd share here. Shot a quick (and horrible....I apologize in advance) video of the problem and fix. Hope maybe this helps someone down the road. It should be noted that it did not solve the attract light sound interference (which doesn't bother me anyway). Just the buzz you'll hear at the start. And the camera doesn't quite pick up how annoying it really was. Anyway, enjoy.
