Imaging Unit - Samsung SCX-483xFD Service Manual

2.2.4.2 Imaging unit

1) Printing process overview
This mono printing system includes the LSU with a laser beams, a toner cartridge and transfer roller.
This machine uses single toner cartridge and dual laser beams for mono printing. The toner cartridge
consists of Drum unit and Development unit. The Drum unit has an OPC drum, cleaning blade.
The OPC drum is charged with a negative voltage by the scorotron 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 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.
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
Service Manual
SCX-483x/5x3x series
2. Product specifications and descriptions
OPC Drum OPC Drum
Transfer Roller Transfer Roller
to the paper.
LSU LSU
Toner Cartridge Toner Cartridge
2-18
Samsung Electronics