Brother International HL 1850 Users Manual - English - Page 164
Turn the drum unit gear by hand while looking at the surface, exact position of the image fault.
UPC - 012502603900
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Page 164 highlights
CHAPTER 6 TROUBLESHOOTING Image Defect Examples 94 mm (3.7 in.) 94 mm (3.7 in.) Recommendation • If the problem is not sorted out after printing a few pages, there may be glue on the 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 image fault. White Spots Printed pages have white spots in black text and graphics at intervals of 94 mm (3.7 in.). 94 mm (3.7 in.) 94 mm (3.7 in.) Black Spots Printed pages have black spots at intervals of 94 mm (3.7 in.). Fig. 6-31 2. Turn the drum unit gear by hand while looking at the surface of the drum. Fig. 6-32 3. When you have found the mark on the drum that matches the print sample, wipe the surface of the drum with a dry cotton swab until the dust or paper powder on the surface comes off. Fig. 6-33 6-25