Print-quality troubleshooting tools
Repetitive image defects
If the product output has a consistent, repetitive defect, use the table in this section to determine
which part needs to be replaced based on the measured distance between the repetitions of the
defect.
Repetitive defects for the ITB normally appear on every other page, because the ITB is longer than a
page. However, the period of the repetitive defect can vary depending on the type of media, and a
repetitive defect can occur more than once on the same page.
NOTE: The following table replaces the graphical repetitive defect ruler. You can make your own
ruler by using these measurements.
Table 2-2 Repetitive image defects
Distance between identical defects Component Notes
22.3 mm (0.87 in) Developer roller (one rotation) Appears in a single color plane
26.7 mm (1.05 in) Charger roller Appears in a single color plane.
28.5 mm (1.12 in) Developer RS roller (one rotation) Inside developer, it and removes
and supplies toner to the developer
sleeve.
44.0 mm (1.73 in) Registration roller
56.5 mm (2.22 in) Fuser film (one rotation) Appears in all color planes.
56.8 mm (2.23 in) Fuser pressure roller (one rotation) Appears in all color planes.
57.0 mm (2.24 in) Transfer roller Appears in all color planes.
69.0 mm (2.71 in) Cartridge-to-cartridge spacing Distance between each color OPC.
75.8 mm (2.98 in) OPC drum (one rotation) Appears in a single color plane and
might be either a dark or white spot.
633.6 mm (24.94 in) ITB Because the ITB is longer than a
page, you might have to look at
multiple pages to determine if a
repetitive defect is present.
69.0 mm (2.71 in) ITB drive roller pitch
Calibrate the product to align the colors
If the printed output has colored shadows, blurry graphics, or areas that have poor color, you might
need to calibrate the product to align the colors. Print the Diagnostics Page from the Reports menu
on the control panel to check the color alignment. If the blocks of color on that page are not aligned
with each other, you need to calibrate the product.
1. On the product control panel, open the System Setup menu.
2. Open the Print quality menu, and select the Calibrate color item.
3. Select the Calibrate now option.
ENWW Tools for troubleshooting 77
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