Samsung SCX-82x0 series, Руководство по обслуживанию

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2. Product Description
SAMSUNG ELECTRONICS Service Manual
2-31 2-31
2.5 Image creation
2.5.1 Printing process overview
This mono printing system includes the LSU with a laser beams, a imaging unit and transfer unit.
This machine uses single Imaging unit and dual laser beams for mono printing. The Imaging unit consists of
Drum unit and Development unit. The Drum unit has an OPC drum, a scorotron (which charges the OPC),
a light-guide ( which transfers the LED’s light in the machine) and cleaning blade.
The OPC drum[A] is charged with a negative voltage by the scorotron and is exposed by the light from the
LSU (Laser Scanning unit)[B]. 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 and
electric filed. The toners(real image) on the OPC drum are moved to the transfer media by the positive bias
applied to the transfer roller[c].
1. Charging the OPC drum: The scorotron gives the drum negative charges.
2. Laser exposure : Light produced by a laser diode irradiates the charged OPC through the lens and
mirrors .
3. Development: This machine uses a dual-component development system . The magnetic roller carries
negatively charged toner to the latent image on the drum surface.
4. Transfer: The transfer rollers opposite the OPC drums transfer toner from the drums to the transfer
media (e.g. paper, OHP film, etc).
5. Cleaning for OPC drum : The cleaning blade removes remaining toners on the drum surface after image
transfer to the paper.
6. Quenching for OPC drum: Quenching is done by illuminating the whole area of the drum with the LED
lamps at the end of every job.
This section describes the image creation process used by the printer.