Brother International MFC-8820D Users Manual - English - Page 371

Examples of poor print quality 94 mm (3.7 in.) 94 mm (3.7 in.) White Spots on black text and graphics at 94 mm (3.7 in.) intervals Recommendation If the problem is not solved after printing a few pages, the drum unit may have glue from label stock on the OPC drum surface. Clean the drum unit as follows: 1 Position the print sample in front of the drum unit, and find the exact position of the poor print. 94 mm (3.7 in.) 94 mm (3.7 in.) Black Spots at 94 mm (3.7 in.) intervals 2 Turn the drum unit gear by hand while looking at the surface of the OPC drum. Do not touch the photosensitive drum with your fingers. Photosensitive drum 3 When you have located the mark on the drum that matches the print sample, wipe the surface of the OPC drum with a cotton swab until the dust or paper powder on the surface comes off. Do not try to clean the surface of the photosensitive drum with a sharp object, such as a ball-point pen, and so on. The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum unit on page 22-34.) TROUBLESHOOTING AND ROUTINE MAINTENANCE 22 - 19