Exposing Process - Lexmark C500n Service Manual

5023-110

Exposing process

In the exposing process, the OPC belt surface is exposed to the laser light which forms an electrostatic
latent image.
The luminous source of the laser is a semiconductor laser. See "Printer theory of operation" on
page 1-14 for optical unit location.
The laser light scans the OPC belt, forming an electrostatic latent image.
1. The OPC belt surface is charged to -Vo(V) potential.
a. The laser scans the OPC belt in a rectangular pattern during forward movement of the OPC belt.
b. High speed switching of the laser matches the transmitted image data.
c. The charge of the areas radiated by the laser light is discharged, creating a -VR(V) potential.
d. An electrostatic latent image is formed (invisible) on the OPC belt.
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Service Manual