Read Sharp AL-1566 (serv.man9) Service Manual online
to 0.3 microns thick)
(Structure of the OPC drum layers)
Photo Conductor) for its photoconductive material.
latent image forms a visible image on the drum surface when toner is
a combination of heat and pressure.
controlled by the print pattern signal. The laser writes onto the OPC
(corresponding to the print pattern signal). The beam neutralizes the
magnetic brush developing method, and the toner is charged negative
repel the toner, whereas the laser exposed portions where no negative
paper by applying a positive charge from the transfer corona to the
connected to ground.
blade. It is transported to the waste toner collecting section in the
:Toner (Charge negative by friction)
(N) (S) Permanent magnet
radiated onto the drum to reduce the electrical resistance in the OPC
When the electrical resistance is reduced, positive charges on the
on the drum at all times, It control the surface potential regardless of
As the photoconductor is charged by the saw tooth from the main
nears the grid potential, the current turns to flow to the grid so that the
semiconductor laser using negative to positive (reversible) developing
added when the drum is charged, the carrier is attracted to the drum
and the grid potential of the Scorotron charger.
make it easily understood, the figure below shows voltage transition at
pulled towards the drum by the electrostatic force of -400V.
Retaining developing bias at an abnormal occurrence
during print process. In this event, the drum potential slightly abates
the developing bias for a certain period and decrease the voltage
added before resuming the operation after an abnormal interruption.