Ricoh K-C3 Service Manual page 208

B245/B276/B277/B268/B269 Service Manual
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.
4. Development
The magnetic developer brush on the development roller comes in contact with the latent
image on the drum surface. Toner particles are electrostatically attached to the areas of
the drum surface where the laser reduced the negative charge on the drum.
5. 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.
6. Image Transfer
Paper is fed to the area between the drum surface and the transfer roller at the proper
time for aligning the copy paper and the developed image on the drum surface. Then, the
transfer roller applies a high positive charge to the reverse side of the paper. This
positive charge pulls the toner particles from the drum surface onto the paper. At the
same time, the paper is electrostatically attracted to the transfer roller.
7. Paper Separation
Paper separates from the drum as a result of the electrostatic attraction between the
paper and the transfer roller. The discharge plate (grounded) helps separate the paper
from the drum.
8. Cleaning
The cleaning blade removes any toner remaining on the drum surface after the image
transfers to the paper.
9. Quenching
The light from the quenching lamp electrically neutralizes the charge on the drum
surface.
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