Copy Process
D017/D018/D019/D020 6-16 SM
6.3 COPY PROCESS
1. Exposure
A xenon lamp exposes the original. Light reflected from the original passes to the CCD,
Were 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
memory.
2. Drum Charge
In the dark, the charge roller gives a negative charge to the organic photo-conductive
(OPC) drum. The charge remains on the surface of the drum because the OPC layer has a
high electrical resistance in the dark.
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 IPU board.
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