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Thank you very much to everyone in this thread.
My Hantek DSO5202P had the same symptom: All rotaries were non-functional.
I opened it up and without even desoldering, checked continuity between rotary casing and each of its pins. Obviously the structural solderings beeped, because they *are* the case.
For exactly one knob, the multi-functional knob, there was a short between the case and all but one of the pins. I desoldered the two diodes (easier than desoldering the rotary knob, especially with the bad soldering iron I had available), and that made all the other knobs work.
Fixing that knob too is a project for another day, but this fixed the oscilloscope enough to make me able to accomplish what I needed today.
Again, thanks to everyone in this thread.
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Post time 2024-5-5 19:26:53