having an issue with RFM and SWE1, same cabinet. when either game is turned on the within 12-16 seconds the relay buzzes. everything's good for another 12-16 seconds and the relay buzzes again. This continues over and over again until the game is turned off.

The buzzing will happen almost every time the game is turned on. on occasion the buzzing doesn't happen at all. I just assumed it might be the caps, so I replaced all the electrolytic ones on the power driver board but the problem persists.

If anyone has any suggestions as where to look I'm open

I actually have another NOS power driver board. but I'm afraid to try it mainly because I don't want anything to happen to it.

yeah, I don't even have that installed. it's almost every ten seconds on the mark.

there is only one relay in on the board in question. it's a dpdt 12vdc relay, I'm not really sure that the relay itself is the issue but more like a symptom, then again. another thing is all the lights dim during the buzz.

I'm in the process of getting another computer hooked up just to verify that it is indeed a power driver board issue. sadly I'm not having any luck getting it to boot.

you were right on the money, It was the transistor.

I have experience with higher voltage circuits mains, I've only recently gotten into ic circuits. So reading some of these diagrams and making sense of what is going on can be a challenge. Still got a lot of learning to do, thank you for your help.

never mind it wasn't there for a while and now it came back. must be another symptom, I'm starting to think it's a computer problem.

I swapped the playfield
I swapped the power driver board
I unplugged the monitor
the only thing in common with all these is the motherboard.

guess it was just a coincidence that it decided to start working when the transistor was replaced.
these problems that are intermittent are really a pain in the ass.

yeah, I'm running a newer computer with a quad core. I had to upgrade to Ubuntu 15.10 in order to get everything to function correctly. sound and video

I'm not 100% the buzz is gone, but after replacing a wire that was getting smashed in the coin door the buzz hasn't been heard from in 3 days of testing. I also finally got my SWE1 playfield functioning.