How to do this isolation thing? Is it dangerous? Quite interested to know. Sorry not helping.

BTW, I wast 1 day wonder about why temp. not working for my CPA2 and found that there is something called temp. overheat. I guess it must be the same for ATL1000. I got a ATL1500. WHen I go to the darkroom, I would check that button whereabouts as well. Just not sure I would touch anything. Not electrical man.