Xerox 6250N Service Manual - Page 183

Print-Quality Problems Overview Print-quality defects can be attributed to printer components, consumables, media, internal software, external software applications, and environmental conditions. To successfully troubleshoot print-quality problems, as many variables as possible must be eliminated. The first Step is to generate prints using printable pages embedded in the printer on laser paper from the supported media list. The paper should be from an unopened ream that has been acclimated to room temperature and humidity. See the supported media list in "Xerox Supplies and Accessories" on page 9-51 for media that has been tested and approved for use in the Phaser 6250 printer. If the print-quality defect is still present when printing on approved media from an unopened ream, then software applications and environmental conditions need to be researched. Print the Printer Status Page or Service Usage Profile to determine the temperature and humidity under which the printer is operating. Compare this to the environmental specifications for the printer found in "Environmental Specifications" on page 1-13 of this manual. Temperature and humidity extremes can adversely effect the Xerographic and fusing characteristics of the printer. The Phaser 6250 printer uses an Imaging Unit that contains all the imaging drums and developers for all four colors in one Routine Maintenance Item. Print-quality defects can be isolated to one particular component in the print engine, See the Repeating Defects chart under "Defects Associated with Specific Printer Components" on page 5-3 or print the Repeating Defects Page from the front panel. When a single component of the Imaging Unit is causing a print-quality defect, the entire Imaging Unit must be replaced. When analyzing a print-quality defect, first determine if the defect occurs in all colors or only one color and if it is repeating or random. Defects occurring in only one color are usually attributable to the Imaging Unit. Continuous defects in the process direction, such as voids and lines, are the most difficult to diagnose. The visible surfaces of all rollers should be inspected for obvious defects. If no defects are observed, the Imaging Unit, Transfer Roller and Fuser should be changed one at a time until the defect has been eliminated. 5-2 Phaser 6250 Color Laser Printer Service Manual