Xerox 8500DN Service Manual - Page 249

Manuf. Skew Margins Print-Quality Troubleshooting This print consists of an image used by manufacturing to gauge skew and margin on 2 sided prints. 1 MM 2 1 MM 3 2 3 1 2 3 MM s8400-145 s8400-201 To measure skew, measure 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 is (5.1 - 4.9) = 0.2 mm. Skew tolerances 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). Margin tolerance is the margin +/- 2. See the Media Margin Specification in the Appendix. Note Measurements for skew and margin for Sides 1 and 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 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. Phaser 8400/8500/8550/8560 Color Printer Service Manual 5-43