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Phaser 7700 Color Laser Printer Service Manual
3-115
Background Contamination
There is toner contamination on all
or most of the page. The
contamination appears as a very
light gray dusting. The printer
displays no error code.
1.
Ensure that the loaded media
matches the front panel settings.
In some cases, switching the
paper type setting, for example
from Heavy Laser Paper to Thin
Cover/Index, may improve
print-quality.
2.
Run the Calibrate for Paper
routine. From the front panel’s
Support Menu, select Improve
Print-Quality?, then select
Calibrate for Paper Menu.
Note
Printing on some
specialty papers, such
as some glossy finish
papers may show
background contamination.
3.
Inspect the print cartridges for contamination. Replace the print cartridges,
if necessary.
4.
If the Bias Transfer Roller or Belt Cleaner Assembly is near the end of its
life, replace that part.
5.
If the background contamination is a primary color (and that primary color
is missing from the print), the high-voltage wire leading to that color’s
developer housing is grounded. Inspect the high-voltage wiring harnesses.
3041-50
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