Oki C9800 Series, Service & Troubleshooting Manual

Page: 59 / 135

Repeating Bands, Lines, Marks, or Spots
This is usually caused by a damaged roller. In some instances, the spots may be dark
instead of white and are repeated.
Initial Actions
Perform Initial Actions from Print Quality Troubleshooting Practices
Print the Color Test pages to identify the color causing the defect.
Print multiple pages, and then measure the defect and compare it to the Repeating
Defects table (Below) to identify the problem component.
Areas of the Printer that Apply to Repeating Bands, Lines, Marks, or Spots
Imaging Unit
Fuser
Transfer Unit
Note: Consult the “Repeating Defect Spacing Chart” below.
Repeating Defects Spacing
Component Defect Spacing Unit to Replace
Imaging Drum 94.0-94.25 mm Imaging Unit
Developer Roller 49.0-49.60 mm Imaging Unit
Charge Roller 37.4-44.0 mm Imaging Unit
Supply Roller 55.8-57.8 mm Imaging Unit
Fuser Roller 87.3-87.6 mm Fuser
Transfer Roller 57.8 mm Transfer Unit
Transfer Unit Belt 706 mm Transfer Unit