Copy Process Overview - Ricoh B121 Service Manual

COPY PROCESS OVERVIEW

6.3 COPY PROCESS OVERVIEW
B121D907.WMF
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B121D927.WMF
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.
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.
SM 6-7 B121 Series/B259 Series