Drum Charge; Laser Exposure - Epson EPL-9000 Service Manual

Service Manual
EPL-9000

2.1.1.1 Drum Charge

Drum charge is the process of charging static electricity to the
drum before laser exposure. The charge wire discharge to the
drum even. The charge screen between the charge wire and the
connected to the ground through the
maintain the drum surface potential at the specified level (-310

2.1.1.2 Laser Exposure

Laser exposure is the process of creating an invisible static electricity image on the
laser beams emitted from the ROS (Raster Output Scanner) Assembly. The polygon mirror is
rotated by the polygon motor (scanner motor). This is
clockwise direction to produce a laser light scan (one side of the mirror produces one scan). The
SOS (Start Of Scan) sensor detects the laser rays from the SOS mirror and outputs SOS signals in
order to make the starting position of each line of the image uniform.
Laser emission
PC Drum
Invisible
electricity image
Rev.
diode, limits the discharge to the
Charge Screen
Figure 2-4. Drum Charge
Figure 2-5. Laser Exposure
Operating Principles
(Organic Photo Conductor)
drum surface potential of the
1
six-sided mirror which rotates in the
a
/ ' - l
I
Scanner Assembly
drum, which is
drum to
drum by
2-3