Roland GR-540 User Manual page 314

Replacing the Blade and the Separating Knife
If the blade becomes dull, replace it with a replacement blade.
Consumable Items
CAUTION
Remove the material before performing the replacement.
Replacing the Blade
Procedure
Loosen the cutting carriage screw, and then remove the cutting tool
from the carriage.
Be sure to perform operations as specified by the instructions, and never touch any
area not specified in the instructions.
Sudden movement of the machine may cause injury or burns.