Repetitive defects troubleshooting
Defects on printer rollers can cause image defects to appear at regular intervals on the
page. Use the repetitive defects ruler on the next page to measure the distance between
defects that recur on a page. Use
Table 7-38. Repetitive defect spacing to determine which
roller is causing the defect. To resolve the problem, try cleaning the roller first. If the roller is
still dirty after cleaning or if it is damaged, replace the indicated part.
Note
Letter codes before the roller names in Table 7-38. Repetitive defect spacing correspond to
the letters at the top of the repetitive defects ruler. Not all rollers are shown in the ruler.
CAUTION
Do not use solvents or oils to clean rollers. Instead, rub the roller with lint-free paper. If dirt is
difficult to remove, rub the roller with lint-free paper dampened with rubbing alcohol.
Table 7-38. Repetitive defect spacing
Roller Distance Type of defect Replacement part
A toner charging roller 14 mm (.55 inch)
B developing cylinder 50 mm (1.97 inches) defect on front of paper print cartridge
C primary charging
roller
38 mm (1.5 inches) blank spots print cartridge
D toner feed roller 43 mm (1.7 inches)
E transfer/ media
attaching roller (MAR)
38 mm (1.5 inches) defect on front of paper ETB
F fuser pressure roller 63 mm (2.5 inches) defect on back of paper
poor fusing
fuser
G transfer roller
(center to center
distance between
cartridges)
82 mm (3.2 inches)
H photosensitive drum 94 mm (3.7 inches) defect on front of paper
blank spots
cartridge
J fuser sleeve (fuser-
heated roller)
107 mm (4.2 inches) defect on front of paper
poor fusing
fuser
fuser delivery roller 38 mm (1.5 inches) defect on back of paper fuser
output bin delivery roller 41 mm (1.6 inches) defect on back of paper fuser
registration roller 53 mm (2.1 inches) defect on front of paper paper pickup unit
sub registration roller 63 mm (2.5 inches) blank spots paper pickup unit
cassette feed roller 94 mm (3.7 inches) defect on front of paper paper pickup roller kit
cassette separation
roller
94 mm (3.7 inches) defect on back of paper paper pickup roller kit
cassette pickup roller see note below defect on front of paper paper pickup roller kit
366 Chapter 7 Troubleshooting ENWW
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