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PTM 1-9 B070/B071
1.5 COPY PROCESS
1. EXPOSURE
A xenon lamp exposes 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.
2. DRUM CHARGE
An OPC (organic photoconductor) drum is used in this machine. In the dark,
the charge corona unit gives 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.
B070D872.WMF
B070D873.WMF
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