COPY PROCESS
SM 6-3 B234/B235/B236/D101/D102/D103
Detailed
Descriptions
6.3 COPY PROCESS
EXPOSURE
A pair of Xenon lamps [1] expose the original. Light reflected from the original
passes to the CCD, where it is converted into an analog data signal. This data is
converted to a digital signal, processed, and stored in the memory. At the time of
printing, the data is retrieved and sent to the laser diode. For multi-copy runs, the
original is scanned once only and stored to the hard disk.
DRUM CHARGE
An OPC (organic photoconductor) drum is used in this machine. In the dark, first
the pre-charge unit [2] then the charge corona unit [3] give a negative charge to the
drum. The grid plate ensures that corona charge is applied uniformly. The charge
remains on the surface of the drum because the OPC layer has a high electrical
resistance in the dark.
LASER EXPOSURE
The processed data from the scanned original is retrieved from the hard disk and
transferred to the drum by four 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 LDB [4]
(laser diode board).
B234D001.WMF
B234D873.WMF
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