mutoh sc 1400 contour cutting

[mdgraphix]

hi does anyone out there no how to change the axis settings on sc 1400 if i do a contour cut on a 760 wide material its fine but i have just loaded a roll of 1370 media and the machine only reads up to the middleish part of the roll i am assuming that because the machine reads X roll Y 501 on the display this is the problem i have tried changing the parimeters in signlab but cant seem to suss how to do it on the machine any help greatly appreciated