Development Processing; Charging; Exposure; Development - Xerox WorkCentre 385 Service Manual

Development Processing

Charging

CR
-1.4KV
A negative voltage is applied to the surface of the OPC Drum. This is the first
step in creating an electrophotograph. The high voltage section of the Engine
Controller PBA supplies (-)1.4KV to the Charge Roller and transfers a charge of
approximately (-)800 V to the OPC Drum.

Exposure

Unexposed Exposed
-800V
-50V
LSU receives the transferred bitmap image data from the Engine PBA and turns
the LSU's laser diode on and off, exposing the OPC Drum. If there is no data to
print the Laser Diode remains off and the OPC Drum is not exposed. Portions of
the OPC Drum exposed charged to approximately (-)50V by the laser beam
while unexposed portions charge to (-)800V. The image formed by the exposed
laser beam is invisible, and is called a latent image.
WorkCentre 385
-800V
OPC
Unexposed
-800V
OPC Surface
12/98
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7 - 5

Development

OPC
Surface moves between the DEV Roller and the OPC Drum. Negatively
charged Toner is attracted to the high voltage(-50V) of the exposed portions of
the OPC Drum and is exposed more easily than the more negative (-800V)
surface voltage of unexposed areas of the OPC Drum, resulting in a latent
image.
D/R S/R
-300V -500V
GND
Development Processing