Roland GR-540 User Manual page 173

Press [ENTER].
The pinch rolls lower and the carriage and material move.
When the movement is finished, the cuttable width and length are displayed.
Use [ ] and [ ] to move the material and position the crop marks
above the blade protector.
Press [ ] and [ ] to position the tip of the blade over the center of the
lower-left crop mark.
(1) Blade protector
(2) Crop marks