I just put kit K2543 together, but in the instruction I read that Transistor T1 should be mounted flat to the PCB.
In my case, transistor T1 is not flat against the board; it is appr. 1 cm above the board (and touching the heatsink).
Does the T1 has to be flat on the board? and if so, why?
Does the kit not function when it is not mounted flat on the board?
Is it a problem that it touches the heatsink? or is it just enough to put some insulation tape in between.