I recently started having what seems like intermittent solenoid weakness. Most notably with the trough eject, the dreaded auto-launch, the tortuga kickout and the depths kickout. Everything had been working great up until the last few weeks. Now it seems like 1 out of 10 times the coils will have a weak pulse when they activate; the trough has trouble getting the ball into the shooter lane, the auto launcher only gets the ball about halfway up the shooter lane, the tortuga launches the ball down the center, etc.
I had already mechanically dialed in and cleaned these mechs within the last year, and cleaned and checked them again since these issues started. I also tried reseating the connectors for these solenoids on the I/O board, but the problem persists. I am starting to suspect an issue with the ATX power supply, because I have also been getting a noticeable high pitch hum in the speakers for quite a while now which I also have been unable to rememdy, but I'm not really sure how to verify that (JJP support has never responded to my tickets/emails regarding the audio hum). Any suggestions of what else might cause this? Any idea how to test the power supply?