AS-4000 User’s Guide Maintenance C Loosen the two screws at the front of the backing, and remove the front side of the backing. D Inspect the backing plate (the white section) and clean it if it is dirty. If paper dust, dirt, glue, and so on, have stuck to the surface that comes into contact with the substrate, wipe them off with a woven polyester/nylon knit cloth soaked in the alcohol for cleaning ink. If it is difficult to remove the dirt, go to step 5 and remove the backing to clean. If it is not dirty, no cleaning is required. Go to step 8. 76