Image Creation; Printing Process Overview - Samsung SL-M4580FX Service Manual

2.5. Image Creation

2.5.1. Printing process overview

This machine uses a toner cartridge, a imaging unit, transfer roller, and two laser beams in the LSU for mono printing.
The imaging unit consists of a drum unit and developer unit. The drum unit consists of an OPC drum, charge roller, cleaning
roller, and cleaning blade. The developer unit consists of the dev. roller, supply roller, Dr.blade, and agitator.
The OPC drum is charged with a negative voltage by the charge roller and is exposed by the light from the LSU (Laser
Scanning unit).
The light produced by a laser creates a latent image by discharging on the surface of the OPC drum. The negatively charged
toners are attracted to the latent image due to the electric field. The toner(real image) on the OPC drum are moved to the
paper by the positive bias applied to the transfer roller.
1) OPC drum charge : The charge roller gives the OPC drum a negative charge.
2) Laser exposure : Light produced by a laser diode(LD) hits the charged OPC drum through the lens and mirrors. The
machine controls the laser beam on/off for the latent image.
3) Development : The developing roller carries the negatively charged toner to the latent image on the OPC drum surface.
4) Transfer : The negatively charged toner is transferred to the paper by transfer voltage.
5) Cleaning for OPC drum : The cleaning brush and blade remove remaining toner on the OPC drum surface after
image transfer to the paper.
6) Quenching for OPC drum : Quenching is done by illuminating the whole area of the OPC drum with the laser at
the end of every job.
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2. Product Specifications and Description
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