5-2 Phaser 7750 Printer 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 approved media list. The paper should be from an
unopened ream that has been acclimated to room temperature and you should ensure
that genuine Xerox toner is installed in the printer.
Print the “Paper Tips Page” for media that has been tested and approved for use in the
Phaser 7750 Printer. If the print-quality defect is still present when printing on
approved media from an unopened ream of paper, then software applications, and
environmental conditions need to be researched.
Print a “Usage Profile” to determine the temperature and humidity the printer has
been operating under. 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.
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. 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.
Defects Associated with Specific Printer Components
Some print-quality problems can be associated with specific assemblies, the most
common problems and the associated assemblies are listed below. Also, refer to the
specific print-quality troubleshooting procedure for more information.
The ROS
Potential Defects:
■ Streaks from contamination on ROS windows (usually single color)
■ Light Image (single color, or all colors)
■ Banding (Slow Scan direction)
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