Printing Process Overview - Ricoh G147 Service Manual

6.3 PRINTING PROCESS OVERVIEW

Drum Charge
The charge roller [1] 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.
Laser Exposure
The image data is projected onto the drum by two laser beams [2], which form an
electrostatic latent image on the drum surface. The amount of charge remaining as a latent
image on the drum depends on the laser beam intensity, controlled by the BICU.
Development
The magnetic developer brush on the development roller [3] contacts the latent image on the
drum. Toner particles are electrostatically attracted to the areas of the drum surface where
the laser reduced the negative charge on the drum.
Image Transfer
Paper is fed into the area between the drum surface and the transfer belt [4] at the proper
time to align it with the image on the drum. The transfer bias roller applies a high positive
charge to the reverse side of the paper through the transfer belt. This positive charge pulls
the toner particles from the drum surface onto the paper while the paper is electrostatically
attracted to the transfer belt.
G147 6-10 SM