The laser beam only discharges the surface where the beam hits the photoconductor. This creates a dierence
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, vertical streaking of white/lightness on the page occurs. 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 dierential on the surface, and the toner will not properly stick. The result would be repeating
blotches of voids/light print on a page, and the photoconductor will have to be replaced.
• The surface of the photoconductor is coated with an organic substance that makes it sensitive to light. Make
sure to cover the photoconductor to avoid damage. If it is exposed to light for too long, light/dark print quality
problems may occur, and it will have to be replaced.
Step 3: Develop
When the laser exposes the photoconductor, the HVPS sends a charge to the developer roll. For each color,
the print cartridge engages the photoconductor so that it is in contact with the surface. Because of the charge
dierence between the toner on the developer roller and the electrostatic image created by the laser, the toner
is attracted to areas of the photoconductor surface exposed by the laser.
5028
Appendix C: Theory of operation
463
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