Ricoh G035 Service Manual page 48

PRINT PROCESS
1. DRUM CHARGE
In the dark, the charge roller gives a negative charge to the organic photo-
conductive (OPC) drum. The charge remains on the surface of the drum
because the OPC layer has a high electrical resistance in the dark.
2. LASER EXPOSURE
The processed data from the scanned original is retrieved from the memory
and transferred to the drum by two laser beams, 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, which is controlled by
the BICU board.
3. DEVELOPMENT
The magnetic developer brush on the development roller comes in contact with
the latent image on the drum surface. Toner particles are electrostatically
attracted to the areas of the drum surface where the laser reduced the negative
charge on the drum.
4. IMAGE TRANSFER
Paper is fed to the area between the drum surface and the transfer belt at the
proper time to align the copy paper and the developed image on the drum
surface. Then, 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 on to the paper. At the same time, the
paper is electrically attracted to the transfer belt.
5. PAPER SEPARATION
Paper separates from the drum as a result of the electrical attraction between
the paper and the transfer belt. The pick-off pawls help separate the paper from
the drum.
6. ID SENSOR
The laser forms a sensor pattern on the drum surface. The ID sensor measures
the reflectivity of the pattern. The output signal is one of the factors used for
toner supply control. Also, the ID sensor measures the reflectivity of the drum
surface. The output signal is used for charge roller voltage control.
7. CLEANING
The drum cleaning blade removes any toner remaining on the drum surface
after the image is transferred to the paper.
8. QUENCHING
The light from the quenching lamp electrically neutralizes the charge on the
drum surface.
G035 1-16 SM