Repetitive defect ruler
Defects on rollers can cause image defects to appear at regular intervals on the page, corresponding
to the circumference of the roller that is causing the defect. Measure the distance between defects
that recur on a page. Use
Table 7-19 Repetitive defects or the repetitive defect ruler to determine
which roller is causing the defect. To resolve the problem, try cleaning the roller first. If the roller
remains dirty after cleaning or if it is damaged, replace the part indicated in
Table 7-19 Repetitive
defects.
NOTE 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 that has been dampened with
water.
Table 7-19 Repetitive defects
Reference Roller Distance between defects Replacement part
1 First occurrence of the defect
2 Primary charging roller 38.0 mm (1.5 inches) Print cartridge
3 Transfer roller 47.0 mm (1.9 inches) Transfer roller (part of the
printer maintenance kit)
4 Developing cylinder (see note) 54.0 mm (2.13 inches) Print cartridge
5 Developing cylinder (see note) 63.0 mm (2.5 inches) Print cartridge
392 7 Troubleshooting
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