Expose - Lexmark C54x Product Study Manual

Lexmark C54x/X54x Color Product Study Guide

Expose

During the expose step, the laser fires a focused beam of light at the surface of each color
Photoconductor and writes an invisible image called a latent image or electrostatic image. This invisible
image is created by discharging the Photoconductors only where the laser beam strikes its surface. This
creates a difference in charge potential between the exposed area and the rest of the photoconductor
surface.
Service Tips
•
The laser beam passes through a glass lens as it exits the laser unit. If this lens gets contaminated with toner or other
debris, it will cause vertical streaking of white/lightness on the page. Cleaning the lens will solve the problem.
•
Never touch the surface of the photoconductor with your bare hand. The oil from your skin may cause a charge
differential on the surface and toner will not stick properly. The result would be repeating blotches of voids/light print
on a page. Then the photoconductor will have to be replaced.
•
The surface of the photoconductor is coated with an organic substance that makes it sensitive to light. Be sure and
cover the photoconductor when you are working on the printer so you don't "burn" it. If exposed to light for too long, it
will cause light/dark print quality problems and have to be replaced.
For Training Purposes Only
Laser Beam
Photoconductors
21
Rev 2.6
9/15/2009