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1 October, 1999
1.7 PRINTING PROCESS
Overview
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1. DRUM CHARGE
The charge roller gives a negative charge to the organic photoconductive
(OPC) drum. The charge remains on the surface of the drum because the OPC
layer has a high electrical resistance in the dark.
2. LASER EXPOSURE
Processed data from the computer/network is retrieved from the memory and
transferred to the drum by a laser beam, which forms an electrical latent image
on the drum surface. The amount of charge remaining as a latent image on the
drum depends on the laser beam intensity, which is controlled by the engine
board.
3. DEVELOPMENT
The magnetic developer brush on the development rollers comes in contact
with the latent image on the drum surface. Toner particles are electrostatically
attached to the areas of the drum surface where the laser reduced the negative
charge on the drum.
4. ID SENSOR
The laser forms a sensor pattern on the drum surface. The ID sensor measures
the reflectivity of the pattern. The output signal is one of the factors used for
toner supply control. Also, the ID sensor measures the reflectivity of the drum
surface. The output signal is used for charge roller voltage control.
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1-11
PRINTING PROCESS
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G038V504.WMF
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