Xerox 8500DN Service Manual - Page 240
Analyzing Service Test Prints, Weak/Missing Jet
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UPC - 095205022063
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Print-Quality Troubleshooting Analyzing Service Test Prints This section shows how to select and analyze all test prints stored in the printer. A variety of test prints are available in the Hidden Service Menu to aid in determining the quality of output from the printer and to assist in troubleshooting problems. To enter the Hidden Service Menu: from the Service Tools menu, press and hold the Up Arrow and Down Arrow buttons. Note Defects revealed by the prints may not occur in the course of ordinary printing. In servicing the printer, you should minimize the defects shown by the prints but not necessarily eliminate them. Weak/Missing Jet This print shows which jets are not outputting enough, if any, ink compared to its neighboring jets. Note that the yellow jets' bands have a small amount of cyan ink added to them, which tints them green, to make them more visible. 74 75 76 77 78 79 80 Weak jet s8500-048 Look for: No interlacing is used in this print; expect light/dark variation between jets. Look for much lighter colored vertical bands in the horizontal bars. Weak jets in the yellow band are distinguished by a cyan tint. Causes: A jet may be partially clogged; perform Printhead clean/purge cycles on the Printhead to remove contaminants from the poorly-performing jet. If jet substitution mode is required, see "Jet Substitution Mode" on page 6-9. Test the purge system and the wiper blade performance. Turn the printer off for 4 to 6 hours (or overnight, if practical). Then perform a clean/purge cycle again. There may be a problem in the Purge Pump or the Wiper Assembly. Verify that Xerox ink is being used. Follow the instructions on the "Printhead Troubleshooting Checklist". Note Include two prints of this test print with any returned Printhead. 5-34 Phaser 8400/8500/8550/8560 Color Printer Service Manual
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