Charging Process - Epson EPL-5900 Service Manual

EPSON EPL-5900/EPL-5900L

2.2.3 Charging Process

Overview
Before laser exposure, static electricity is given to the OPC drum (Organic Photoconductor)
to charge it.
The surface of the OPC drum is charged by the rotating brush (charging brush) and pre-
charging film.
Charging by the rotary brush (charging brush) and the pre-charging film rarely causes
ozone generation resulting from corona discharge. In addition, since charge is given directly
to the OPC drum, this charging method requires a low voltage and excels in homogeneity
and stability of the electric potential.
The pre-charging film performs preliminary charging before charging with the rotary brush
(charging brush) to enhance efficiency of charging.
The rotary brush (charging brush) is rotated by the driving force which is transmitted from
the main motor (M1) to the gear of the brush.
The electric potential on the surface of the OPC drum after charging is about -800V.
Operating Principles
Laser Exposure
Developing Sleeve
Roller
Description of Mechanisms
Drum Cartridge
OPC Drum
Drum Cover
(Photoconductor)
Rotary Brush
OPC Drum
Grounding
(Photoconductor)
Figure 2-11. Charging Mechanism
Revision B
Charging Brush
Paper Powder
Cleaner
Pre-charging
Film
Transfer Roller
Charging
Brush
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