Roland GR-540 User Manual page 440

Do not set the origin.
Crop marks cannot be read in the situations indicated below.
If any of the following situations occur, remove the material, and then reload it.
The left and right crop marks are slanted by 5 degrees or more with respect to the moving
direction of the cutting carriage.
The left and right crop marks are offset by 20 mm or more in the material-feed direction.
The crop marks are separated from the blade protector by a distance of 15 mm or more.