Copy Processes Around The Drum - Ricoh FT5540 Service Manual

31 August 1989

3. COPY PROCESSES AROUND THE DRUM

DRUM CHARGE
In the dark, the charge corona unit gives a uniform positive charge to the selenium drum. The
charge remains on the surface of the drum because the photoconductive selenium has
electrical resistance in the dark.
EXPOSURE
An image of the original is reflected to the selenium drum surface via the optics assembly. The
charge on the drum surface is dissipated in direct proportion to the intensity of the reflected
light, thus producing an electrical latent image on the drum surface.
1-10