Xerox Phaser 8400 Service Manual page 268

Test Print Examples (Continued)
Manuf. Skew Margins
This print consists of an image used by
manufacturing to gauge skew and margin on
2 sided prints.
Skew
To measure 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, 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
Custom media: evaluate with the following
formula: Skew Spec (mm) = 998.4*(width-
12.5)^(-1.02), where width is in millimeters.
To measure margin, 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 printer) of the paper.
The tolerance for margin is the margin +/- 2.
See the Media Margin Specification in the
Appendix.
NOTE: The measurement for skew and margin
for Side 1 and Side 2 may not match
Check: The media must be supported for the
tray. The side and rear guides must be adjusted
to the size of the paper to ensure correct
deskewing.
If you have skew on simplex prints, in Tray 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.
5-42 Phaser 8400/8500/8550 Color Printer
8400 145
1 2 3
MM
s8400-201