Roland GR-540 User Manual page 328

Are the size and shape of crop marks correct?
Make the crop marks perfect circles 10 mm (0.39 in.) in diameter.
The machine can only detect crop marks in the prescribed shape.
Crop Marks
Are the crop marks at the correct positions?
Refer to "Setting the Margins and the Distance between Crop Marks"
positions.
Is the [ROTATE] menu set to [90deg]?
Be sure to set the [ROTATE] menu to [0deg] when using crop marks.
Crop marks cannot be read if this is set to [90deg].
Setting the Direction of the Coordinate Axis for Cutting <ROTATE>
Is the machine exposed to direct sunlight or strong indoor lighting?
If the cutting carriage sensor is exposed to direct sunlight or indoor lighting, crop marks may not be detected.
Move the machine to a location where it is not exposed to direct sunlight or indoor lighting.
If the Issue Is Not Resolved Even after Taking the Above Steps
Perform alignment in Tool Mode.
Cutting in Tool Mode (1)
and place the crop marks at the correct