Roland GR-640 User Manual page 498

"LENGTH NG," "WIDTH NG," or "ANGLE TOO BIG" Is
Displayed
Is the material loaded at an angle? Are the printing results crooked?
Crop marks cannot be detected in the following cases:
The left and right crop marks are slanted by 5 degrees or more with respect to the
moving direction of the carriage.
The left and right crop marks are offset by 20 mm or more in the material-feed
direction.
Do the distances between crop marks specified by the software match
those specified on the machine? (Manual mode)
On the machine, correctly set the distance specified by the software.
Are the crop marks at the correct positions?
If the angle formed by the two lines connecting the centers of the crop marks is not
90 degrees, the crop marks cannot be read. Crop marks cannot be read if the
distance between crop marks in the material-feed direction is 500 mm (19.69 in.) or
more.
Is the printing expanded or reduced?
If the size is expanded or reduced during printing, the crop marks cannot be read
during cutting. Print the data by specifying 100% for the magnification.