Ricoh LD013, Service Manual

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COPY PROCESS OVERVIEW
B039/B040/B043 6-8 SM
3. LASER EXPOSURE
The processed data scanned from the original is retrieved from the memory and
transferred to the drum by a laser beam, which forms an electrical 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.
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.