At Qld Astrofest in 2002, I had a power supply (mains to 12V 4A DC) where an internal heat sink (live) became loose and ended up touching the external metal case of the power supply and as a result, I got circulating currents in other cables connected to my Skysensor 2000 controller, making the auto guider cable become quite warm to the touch.
Reanto diagnosed this for me, re-seated the heat sink and the problem went away. I was extremely fortunate that no damage was done.
Cheers
Dennis
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