Thanks in advance for a little help with sound buzzing. I get a pretty loud hum as the pin cycles through the lights in between games. Since I need to pull the Sys 9 board and replace a power transistor for a pop bumper, I was going to replace several of the radial capacitors on the lower right of the board (C2,5,7,24,53). I know old caps can be one source of the problem.
But I've since discovered that the culprit for about 95% of the buzzing. It occurs when the pop bumper lights illuminate through the sequence. They had been replace by a previous owner with LED's (I think BriteCaps EVO). If I pull these lights out, it eliminates the 95% of the buzzing or humming.
So my question is, does this change my approach? Would different lights here fix the issue? Maybe someone can chime in that has these lights. I'll probably still go ahead and replace the caps, but might put that off since I don't have those on hand yet if the lights are the culprit.
Also if I unplug the sound board (Swemmer 147-4-19) the buzzing stops. Not sure if that adds anything, but thought I'd mention that also since that's where I started my troubleshooting.
Pop Bumper (resized).JPG