Copy Process Overview
SM 6-11 D014/D015/D078/D079
Detailed
Descriptions
Laser Exposure
The processed image data from the scanned original is taken from the hard disk and two
laser beams [4] fire and write it as an electrostatic latent image on the drum surface. The
amount of charge used to create the latent image on the drum depends on the intensity
and duration electrical pulse that fires the laser beam pulse.
Drum Potential Sensor
There are four drum potential sensors [5], one mounted on the main machine above each
PCU. These sensors detect and measure the electrical potential on the surface of each
drum. This is necessary because frequent and temporary changes in temperature and
humidity, as well as the changes in the surface of the drum as it ages, affect drum potential.
The machine uses the readings of these sensors to set the voltage levels that are
frequently adjusted during auto process control. This ensures optimum performance of
copying and printing.
Development
The magnetic developer brush of the development roller [6] brushes over the latent image
on the rotating drum surface. Toner particles are electrostatically pulled from the magnetic
developer brush onto the drum surface where the laser reduced the negative charge on the
drum. The attracted toner is applied over the latent image.
Image Transfer
The developed toner images are transferred from the drums to the image transfer belt (ITB)
[7]. Rollers under the ITB apply a high positive charge to the reverse side of the ITB. This
positive charge pulls the toner particles from the surface of the drum to the ITB. The toner
pulled from the drum creates a duplicate of the image pattern on the surface of the belt.
Quenching
The light from the quenching lamp [8] neutralizes the charge that formed the image on the
drum surface. After cleaning and quenching, the drum surface is ready for the next cycle.
Drum Cleaning
The opposing cleaning blade [9] removes toner remaining on the drum after transfer of the
image. The soft lubricant brush roller [10] applies lubricant (ZnSt from the lubricant bar [11])
to the area cleaned by the cleaning blade. Finally, the lubricant blade [12] smoothes and
levels the lubricant applied to the OPC.
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