October 2012
3-5
ColorQube 8570/8870 Service Manual
IQ1, IQ2
Image Quality
Xerox Internal Use Only - Revised, 3rd Revision
IQ1 Image Quality Entry RAP
The purpose of this RAP is to establish the source of the imaging defect. After following the Ini-
tial Actions, select the RAP that best describes the observed defect.
Initial Actions
Computer applications, hardware malfunctions, or communication can cause print-quality
issues. Hardware failures that result in image quality problems can occur in the Print Engine.
Use the following steps to determine which part of the printer is at fault.
1. Cycle power to the printer.
2. Print the 2-sided demo page and Solid Prints (for each color) from the Control Panel
(Control Panel Menu -> Information -> Sample Pages -> 2-Sided Demonstration). If
the image defect appears on the printed page, the problem is within the Print Engine.
When analyzing a print-quality defect from a Print Engine malfunction, determine if the
defect occurs:
• in all colors
• in only one color
• as a repeating or random defect
NOTE: To aid in troubleshooting image quality issues, print the Paper Tips page. The paper
should be from an unopened ream that has been acclimated to room temperature.
Diagnosing Print-Quality Problems
The Troubleshooting Print-Quality page provides a good overview of the most common print-
quality problems. To print the Troubleshooting Print-Quality page, follow these steps:
1. From the Control Panel, scroll to Troubleshooting, then press the OK button.
2. Scroll to Print Quality Problems, then press the OK button.
3. Select Troubleshooting Print Quality Page, then press the OK button.
The Troubleshooting Print Quality page includes the Eliminate Light Stripes test print. The
Eliminate Light Stripes test print indicates individual weak or missing jets or an obstruction in
the imaging page that affects a vertical band down the entire page. Also, you may see color
variation from jet to jet on the Eliminate Light Stripes test print. Some variation is normal, occa
-
sionally occurs, and usually self-corrects within a few printed pages.
If a print-quality problem is not resolved with the information provided in the Diagnosing Print-
Quality Problems section, refer to the Test Prints section.
IQ2 Random Light Stripes
Random light stripes typically result from an obstructed Printhead jet. Most jet obstructions are
caused by paper fibers or air bubbles.
NOTE: If there are discolored jets, as shown in Figure 2, print several Solid Fill test prints in the
affected color. In the following example, the center yellow stripe has discolored jets, therefore
you would print the yellow solid fill.
Discolored jets will self-correct with normal printing.
Figure 1 Random Light Stripes
Figure 2 Discolored Jets on the Light Stripes Page
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General
Weight and Dimensions
