Brother International HL 5370DW Users Manual - English - Page 141
Clean the drum unit as follows, Examples of poor print
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Troubleshooting Examples of poor print quality Recommendation If the problem is not solved after printing a few pages, the drum unit may have glue from a label stuck on the OPC drum surface. Clean the drum unit as follows: 7 1) Put the print sample in front of the drum unit, and find the exact position of the poor print. White Spots on black text and graphics at 94 mm (3.7 in.) intervals 2) Turn the drum unit gear by hand while looking at the surface of the OPC drum (1). 7 Black Spots at 94 mm 1 (3.7 in.) intervals 3) When you have found the mark on the drum that matches the print sample, wipe the surface of the OPC drum with a dry cotton swab until the dust or glue on the surface comes off. IMPORTANT DO NOT clean the surface of the photosensitive drum with a sharp object. The drum unit may be damaged. Put in a new drum unit. See Replacing the drum unit on page 102. 131