Brother HL-1800 series - Manual (Page 164)

CHAPTER 6 TROUBLESHOOTING
6-25
Image Defect Examples Recommendation
94 mm
(3.7 in.)
94 mm
(3.7 in.)
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.).
• 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.
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