Xerox 8500DN Service Manual - Page 262

Adjustments and Calibrations Jet Substitution Mode On 8400 models, the Jet Substitution Mode provides a temporary solution for print-quality problems when weak or missing jets cannot be recovered. When Jet Substitution Mode is active, adjacent jets are used to print over the area covered by the problem jet to restore the print-quality. Jet Substitution Mode reduces the maximum imaging speed by 50% or more and has other limitations that affect printer performance. Jet Substitution Mode on 8500/8550/8560 models is in the Eliminate Light Stripes menu. Although it does not slow down the imaging speed as it does on 8400 models, it still provides an end solution to eliminating light stripes. Phaser 8500/8550/8560 printers feature a Jet Substitution mode that is similar to Phaser 8400 printers, but with two important differences: ■ Jet Substitution mode on 8500/8550/8560 models can provide an end solution instead of serving as a temporary fix (as for Phaser 8400 printers). Because Jet Substitution mode can provide an end solution, it is located in the "Eliminate Light Stripes" menu instead of requiring a hidden push button sequence, as is the case with Phaser 8400 printers. ■ Most 8500/8550/8560 users will not notice changes to print-quality or speed when using the Jet Substitution mode. It typically increases the imaging time by no more than one or two seconds per page compared to a 50% increase on 8400 modles. The knowledge base provides new procedures for determining when to use Jet Substitution mode. Factors such as the use of the Billing Meters feature and multiple, adjacent problem jets can affect the recommended solution. Enabling Jet Substitution Mode (8400) To add Jet Substitution Mode to the Control Panel menu: 1. Scroll to Troubleshooting, and then press the OK button. 2. Scroll to Print Quality Problems, and then press the OK button. 3. Press and hold the Up Arrow button, then press the Back button. The Jet Substitution Mode is now displayed on the Control Panel. 6-12 Phaser 84000/8500/8550/8560 Color Printer Service Manual