Image Creation - Samsung ProXpress M337x Service Manual

2.2.4.2. Image Creation

1) Printing process overview
This mono printing system includes the LSU with a laser beam, a toner cartridge and transfer roller.
This machine uses toner cartridge and laser beam for mono printing.
M337x/M387x/M407x series has 2 types of toner cartridge. M3370/M3870/M4070/M4072FD series has the integrated
toner system and M3375/M3875/M4075 series has separated toner system. The separated toner system consists of toner
cartridge and imaging unit. The imaging unit has an OPC drum, cleaning blade etc.
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 and electric field. 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 charge roller 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.
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2. Product Specifications
2-20