I hate to interject into this very interesting and exciting thread which I am finding much more interesting than CNN, but one thing does concern me. That is I have spent many hours searching for a trouble when the answer was far simpler. I would want to make absolutely certain that the problem wasn¡¯t in the AC side of things. I would take off the cover and set up to both measure the ac inside the scope and use a probe or clip lead to jumper the switch. If it doesn¡¯t help no harm no foul. But I would certainly check these two things before ripping the poor scope apart. Jm2?.
John Williams