Print-Quality Problems Overview - Xerox phaser 6250 Service Manual

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