Load vinyl, drop handle, hit down arrow, watch AAS & Blade Unit scan width only to be incorrect. Need to troubleshoot in order to repair (replace part). P.S. - Pinch rollers are properly placed and pinching. The unit is not detecting actual width. Keeps insisting on 54", perhaps a blind maximum. Any ideas appreciated. If I don't respond right away I am falling asleep and will continue when I regain consciousness.