Xerox Phaser 3425, Service Manual

Page: 85 / 180

Print-Quality Troubleshooting 5-3
Fuser
■
Hot or Cold Offsetting
■
Repeating Defects
■
Voids
Repeating Defects
Front Panel Test Print
A test print is available to aid in determining the quality of output from the printer and
to assist in troubleshooting problems. Each area of the test print is used for a print-
quality parameter. The following pages explain each of the areas and the print-quality
parameters.
From the printers front panel menus select
Troubleshooting --> Service Tools
--> Test Prints
.
Use supported paper from a fresh, unopened ream (whenever possible), to check the
image quality of prints. Make five copies of the test print. Discard the first two prints
and retain the remaining prints for image-quality analysis.
Assembly Component
Distance
between Defects
Typical Defect
Print Cartridge Developer Roller 49 mm (1.93 in.) Horizontal image band
Drum 95 mm (3.74 in.) White spots on black image
or black spots on white
Drum Charge Rollers 38 mm (1.50 in.) Black spots
Supply Roller 45 mm (1.77 in.) Light or dark horizontal
image bands
Transfer Roller Transfer Roller 57 mm (2.24 in.) Image ghost
Fuser Assembly Heat Roller 82 mm (3.23 in.) Black spots and image
ghost
Pressure Roller 92 mm (3.62 in.) Black spots on back