Repetitive image defect ruler
When troubleshooting the source of some print image defects, one solution is to identify if it is a repetitive
defect (does the print quality defect appear multiple times on the printed page?). If this is the case, use a ruler
to measure occurrences of repetitive image defects to help solve image-quality problems. For more
information, see Use a ruler to measure between repetitive defects on page 260.
Place the ruler next to the rst occurrence of the defect on the page. Find the distance between identical
defects and use the table below to identify the component that is causing the defect.
IMPORTANT: Do not use solvents or oils to clean rollers. Instead, rub the roller with lint-free paper. If dirt is
dicult to remove, rub the roller with lint-free paper that has been dampened with water.
NOTE: Defects on the tray pickup rollers or the Tray 1 pickup roller do not cause a repetitive defect. Defects
on these rollers cause a defect to appear only on the leading edge of the image.
TIP: To make a printer specic repetitive defect ruler, use a metric ruler to transfer the measurements in
Table 2-71 Repetitive defects on page 259 to a transparency or the edge of a piece of paper—clearly label
each ruler mark with the associated defective assembly.
Table 2-71 Repetitive defects
Assembly Distance between defects
Primary charging roller
1
26.7 mm (1.1 in)
Face down roller
11
28.3 mm (1.1 in)
Fuser output roller 34.6 mm (1.4 in)
Developer roller
1
44.1 mm (1.7 in)
Transfer roller 44.6 mm (1.8 in)
Registration roller 48 mm (1.9 in)
Tray 2 pickup roller
Tray 2 retard roller
Tray 2 feed roller
50 mm (2.0 in)
Fuser sleeve 75.4 mm (3.0 in)
Pressure roller 78.5 mm (3.1 in)
Photosensitive drum
1
92.4 mm (3.6 in)
1
The primary charging roller, photosensitive drum and developer roller cannot be cleaned. If any of these rollers are indicated, replace
the toner cartridge.
ENWW Print quality troubleshooting guide 259
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