I’ve had a TS-570D for quite some time. Of course, I always say I go through more solder than log books, so it goes a long time between uses sometimes.
Lately, I’d noticed the Multi/Ch knob was “sticking” or behaving erratically. This makes it hard to do things like set filters and menu items. I don’t know if sticking is exactly the right word — the encoder would seem to rotate “the wrong way” and otherwise behave strangely.
I had about resigned myself to opening the case and cleaning out the encoder. A quick web search, however, indicated the encoder was sealed. However, on a Web forum I read of a strange fix. Apparently, if you rotate the knob quickly for a long period of time it will “fix” itself. The poster outlined attaching a cordless screwdriver to the shaft and using it to clear the fault.
Well I went low tech. I just rotated the knob manually as fast as I could probably 50 or 100 full rotations. And oddly enough that restored the encoder to like new behavior. I have no idea why.
But meanwhile, look for me on PSK-31!