Ghosting - Xerox Phaser 840 Service Manual

Ghosting

Table 3-15 Ghosting
Step Question and Actions
Occasionally, if the prints have been sitting atop one another, the pressure of the
1
stack and the heat of the printer can cause blocking. This has the appearance of
ghosting. Try printing the image(s) again without the prints stacking on each
other in the output tray.
Run multiple prints; the first 2-sided print will have the worst ghosting. Some
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transfix roller ghosting is inherent to the printer, however, the prints should get
better with multiple prints.
Inspect the Drum Maintenance system. Does the Maintenance Roller contain
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sufficient oil? For Drum ghosting, replace the Maintenance Kit if neccessary.
Ensure the left and right Maintenance Drawer lift pins operate correctly when
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lifted. Verify that the Maintenance Drawer blade is not damaged causing the
blade to incorrectly wipe the drum. Verify that the Maintenance Drawer lift pins
do not have excessive wear. Improper lift pin actuation can cause the
Manitenance Roller to run out of oil prematurely. Replace the Maintenance
Drawer.
Run Diagnostics to verify the Maintenance Cam and Drum Maintenance Clutch
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are operating correctly. Replace the defective parts.
Ensure the drum temperature sensor is clean and properly positioned. Clean,
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realign or replace the sensor.
If none of the above procedures worked, it is permanent drum ghosting. An
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image was run numerous times, consecutively, causing the image to
permanently imprint the drum. One solution is to run 1,000 - 2,000+ blank
prints. Replace the Drum Transfix Assembly.
Drum is too warm.
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Troubleshooting 3 - 97