While he was adjusting an RCA jack (with everything powered up) from his Maggie amp to the PAS he heard a pop in the speakers and the PAS stopped working. He quickly powered everything off, and reconnected the PAS to his ST-70, and the PAS would still not power up.
He removed the cover and there are no smells, dripping, and nothing appears burned.
I’ve tested the 12X4 using a Hickok 600A and it passed. I checked the incoming voltages using a DVM and get the correct voltage at the unswitched outlets and only about 15vac at the switched outlets. I also tested the power switch, and it passed. I don’t know what the resistance readings should be for the PA211 transformer, so I can’t check to see if that’s the problem.
Has anyone encountered this type of behavour and/or help me think through where the issue lies? I’d really hate to just start replacing parts (and ringing up a parts bill for him). I believe that a new power supply is in order if he wants to use it daily, but I’d like to get it up and running before that gets replaced (if possible).
I’ve attached a pic of it (post mortem) to show just how clean and original it is.
Thanks for any and all thoughts, suggestions, opinions, etc.