Xerox COLORQUBE 8870

October 2012
3-32
ColorQube 8570/8870 Service Manual
Color Bands, RGBK Dither
Revised, 3rd Revision - Xerox Internal Use Only
Image Quality
Color Bands, RGBK Dither
The large, secondary colored areas in this print reveal banding and weak jets.
Look for: Vertical “bars” or “bands” of much lighter color or a different hue running in-line in
one or more of the solid fills.
Causes: A weak jet can cause banding; see the Weak/Missing Jets test print. Use Service
Diagnostics to ensure that the printhead and drum thermals are correct. Follow the instructions
on the Printhead Troubleshooting Checklist.
Figure 5 Color Bans
Figure 1 Red Dither Figure 2 Green Dither
Figure 3 Blue Dither
Figure 4 Black Dither