Lexmark C 540n, Service Manual

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3-38
Service Manual
5025-2xx, 4xx
Step 1: Charge
During the charge step, voltage is sent from the high-voltage power supply to the charge roll inside each of the
four photoconductors. The charge roll is part of the photoconductor unit.
The charge rolls (A) put a uniform negative charge over the entire surface of the photoconductor to prepare it for
the laser beam.
Service tips:
•
If the surface of the charge roll is damaged (such as a nick or pit), it will cause the charge to be uneven on
the photoconductor. This will cause a repeating mark on the printed page. Check the repeating marks table
that prints from the operator panel. (Press
Menu ( ), select Reports , and select Print Defects .)
•
If the charge roll is severely damaged, the surface of the photoconductor will not be charged properly and
heavy amounts of toner will be deposited on the photoconductor. This causes the printed page to be
saturated with 100% of each color. The imaging unit will need to be replaced sooner.