Xerox Phaser 8860 Service Manual page 122

Transfix Roller defects do not move in the X-direction, but these defects repeat every 4.58 in.
(11.63 cm) down the length of the page. Many Transfix Roller defects are the most visible on
duplex solid fills.
Skew and Margins
This print is used to gauge skew and margin 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 margin for Side 1 and Side 2 may not match
Check that the media is support for the tray and the guides are properly adjusted.
If you have skew on simplex prints: In Trays 2, 3, or 4, check for a worn Take Away 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 an 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.
Image Quality
Figure 10 Skew and Margin Measurement
Banding
This print is used by Manufacturing.
Head Roll
This print is used by Manufacturing.
Head Height
This print is used by Manufacturing.
X Dot Position
This print is used by Manufacturing and Engineering.
Y Dot Position
This print is used by Manufacturing and Engineering.
Chase Pages
A blank piece of paper is used to remove contamination from the Drum, Transfix Roller, and
media path.
Oil Bar Chase
This print is used by Manufacturing.
Purge Efficiency
This print is used by Manufacturing and Engineering.
Cleaning Page
This page is automatically printed following a purge. It is used to flush the jet nozzles of any
possible contamination or color mixed jets. It can also be printed on its own.
09/2007
3-30
Initial Issue
Phaser 8860/8860MFP Service Manual