The design will include connectors that can only fit to one place - they would not wish to have assembly workers wrongly connecting things and blowing them up.
Take any connector and try to fit it to the motherboard in more than one place - you will not be able to. The rotating dial control will very probably have a detent to show the home position.
All this is pure guesswork - I know nothing of these machines - I have no expertise of experience.
Good luck..., April 2015