Yes always check the mains setting too.
I meant the regulated PSU voltages that go to the plug-ins.
Just looked through my browsing history, it was this post mentioning a failed pass transistor in a mil-180 series scope they got, damaging their known working plug-ins.
https://www.antiqueradios.com/forums...hp?f=8&t=90779
Quote:
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I have what was once the AN/USM-281 from hell. The HP model; it was sitting at a hamfest with no plug-ins, marked "free." Took it home and powered it up, seemed OK, so like a fool, I was lazy and tried it out with my pristine plug-ins from my good HP180A. It then proceeded to blow up the vertical plug-in! Learned my lesson. The scope needed a new pass transistor in the power supply but the plug-in was history (not worth fixing, especially how they are put together.)
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David