Xerox PHASER 7500, Service Manual

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5-2 Phaser 7500 Printer Service Manual
Print-Quality Troubleshooting
Print-Quality Problems Overview
Print-quality defects can be attributed to printer components, consumables, paper,
internal software, external software applications, and environmental conditions.
To successfully troubleshoot print-quality problems, eliminate as many variables as
possible. The first step is to generate prints using information pages embedded in
the printer on laser paper from the Recommended Media List (RML). Refer to
“Paper and Tray Specifications” on page 1-19 for supported and specialty paper
that have been tested and approved for use in the Phaser 7500. Use paper from a
fresh ream that is acclimated to room temperature and humidity.
If the print-quality defect is still present when printing on approved paper from an
unopened ream of paper, then investigate software applications and
environmental conditions.
Print the Configuration page to determine the temperature and humidity under
which the printer is operating. Compare this to the
“Environment Specifications”
on page 1-13 . Extreme temperature and humidity can adversely affect 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 occurrence. Continuous
defects in the process direction, such as Voids and Lines, are the most difficult to
diagnose. Inspect the visible surfaces of all Rollers for obvious defect. If no defects
are found, replace the Toner Cartridge, Imaging Unit, Fuser Assembly, Transfer
Roller, Transfer Belt, and Laser Unit one at a time until the defect is eliminated.
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 in this section. Refer to
the specific print-quality troubleshooting procedure for detail information.
Toner Cartridge
• IQ-17 Toner Image Detection Color Stripes