October 2012
3-37
ColorQube 8570/8870 Service Manual
Manufacturing Skew and Margins
Image Quality
Xerox Internal Use Only - Revised, 3rd Revision
Manufacturing Skew and Margins
This print is used to gauge skew and margins on 2-sided prints.
For Skew:
• The measurement between the edge of the paper and the magenta frame should be
within tolerance along the entire length of the top of the paper.
For example, the measurement on the top left side of the sheet should be the same as the
measurement on the top right side of the sheet (within tolerance).
• To calculate skew: Measure the margin at the leading edge of each corner, and then take
the difference between them.
For example, if the margin at the right leading edge corner is 5.1 mm, and the margin at
the left leading edge corner is 4.9 mm, then the skew would be (5.1 - 4.9) = 0.2 mm. The
skew tolerance for the following media types are:
– All sizes except envelopes and custom sizes: 0.0 +/- 0.89 mm
– Envelopes: 0.0 +/- 1.04 mm
– Evaluate Custom media using this formula: Skew Spec (mm) = 998.4*(width-12.5)^(-
1.02), where width is in millimeters
For Margins:
• Measure from the magenta frame to the edge of the paper at the midpoint on the top and
left-edge margin (right side of paper, left side of system) of the paper.
• The tolerance for margin is the margin +/- 2. See the Media Margin Specifications.
NOTE: The measurement for skew and margins for Side 1 and Side 2 may not match.
Check that the media is supported for the tray and the guides are properly adjusted.
If you have skew on simplex prints:
• In Trays 2, 3, 4, or 5 check for a worn Takeaway Roller or Pick Roller.
• In Tray 1, check for a worn Pick Roller.
This test print uses the tray selected in Paper Source on the Paper Handling menu. If you
have skew on duplex prints, check for a worn Duplex Roller and verify that the Front Door is
completely closed and latched on both the left and right sides. If the lead-edge margins are
outside of tolerance, check the Preheater Flag.
Center Image Function
Center Image allows the user to shift the image left-and right. Depending on the amount of shift
when shifting to the right, the right edge of the image may be clipped.
To access Center Image: Troubleshooting -> Service Tools -> at Printer Status Page, press
Up + Down Arrow buttons -> Hidden Service Menu -> Center Image.
Figure 1 Skew and Margin Measurement
Chase Pages
A blank piece of paper is used to remove contamination from the Drum, Transfix Roller, and
media path.
Figure 1 Chase Page
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