Posted by Derek Leggott on 07/09/2018 08:55:35:
As a newbie to this is a Potentiometer the knob that adjusts the speed?
No, it's a preset pot. It will be used during manufacture to set a limit (minimum looking at the silkscreen) that the actual speed control pot will work between.
To blow the preset apart like that means something is seriously wrong. I suspect it's had mains, or the output voltage up it, which is worrying. One would hope that it's an assembly fault rather than a design flaw.
Don't even think about getting the board repaired; the supplier needs to replace the whole board.
Andrew
Edited By Andrew Johnston on 07/09/2018 09:11:29