Oki C9800 Series Service & Troubleshooting Manual page 59

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 the Color Test
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
Note: Consult the "Repeating Defect Spacing Chart" below.
Repeating Defects Spacing
Component
Imaging Drum
Developer Roller
Charge Roller
Supply Roller
Fuser Roller
Transfer Roller
Transfer Unit Belt
Print Quality Troubleshooting Practices
pages to identify the color causing the defect.
Imaging Unit
Fuser
Transfer Unit
Defect Spacing
94.0-94.25 mm
49.0-49.60 mm
37.4-44.0 mm
55.8-57.8 mm
87.3-87.6 mm
57.8 mm
706 mm
Unit to Replace
Imaging Unit
Imaging Unit
Imaging Unit
Imaging Unit
Fuser
Transfer Unit
Transfer Unit