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So I went to fetch the oscilloscope to start probing. Suddenly -- POOF! Smoke, and the lights in my workspace went out. The mains filter blew -- while the machine was switched off! The mains filters on PETs and CBM Floppy Drives are between live and neutral BEFORE the power switch, so ALWAYS connected!
I quickly pulled the plug (not needed thanks to my fuse panel) and inspected the damage...