OKIDATA OL400e Series, Service Manual

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Service Manual for OL400e/OL410e/OL410e-PS
Chapter 2 Principles of Operation
2.3.01 Basic Principals - Electrostatic Printing
A -1.3 Kvdc charge is placed on the charge roller. The charge roller is in direct contact
with the surface of the image drum. The printer engine section enables the LED array in
conformance with the data received from the host via the interface on the main controller
board. Once the charged drum is exposed to this light, an electrostatic image is formed
on the drum surface. This latent image is developed with toner.
Charging
The surface of the image drum is uniformly negatively charged by the application of a negative
charge to the charge roller.
Exposure
Light emitted from the LED head irradiates the negatively charged surface of the image drum.
The electrostatic potential of the irradiated part of the image drum surface is lowered, so that
an electrostatic latent image associated with the print image is formed.