Xerographics Ii - Epson ColorPage EPL-C8000 Service Manual

EPSON EPL-C8000

2.5.6 Xerographics II

1. Drum Cartridge
The Drum Cartridge consists of the Xero. Cartridge, Waste Toner
Box and others.
(a) The Xero. Cartridge consists of the Drum, BCR, Cleaning Blade,
and others.
• The Drum is an aluminium cylinder on which the OPC
(Organic Photoconductor) material has been painted. The
OPC material is photoconductive so a laser scanning the
drum's surface forms an electrostatic latent image on the
drum. (Photoconductive: A photoconductive material is an
insulator (holds potential in the dark) that, when it receives
light, becomes conductive and the potential is grounded.)
• The BCR uniformly charges the drum surface in the Charge
step in the print process.
• The Cleaning Blade scrapes off the residual toner particles in
the First transfer process in the print process.
(b) The Waste Toner Box collects the toner scraped off the drum's
surface by the Cleaning Blade and the other toner sent by the
Auger High Assembly (the toner scraped off from the IBT Belt
Assembly by the Belt Cleaner Assembly).
2. Erase Lamp Assembly
The Erase Lamp Assembly emits a light onto the drum's surface to
remove the residual charges remaining from the previous Charge
process.
3. Waste Toner Sensor
The Waste Toner Sensor detects when the Waste Toner Box is full
of discarded toner.
4. Toner Box Sensor
The Toner Box Sensor detects the Waste Toner Box.
Chapter 2 OPERATING PRINCIPLES
5. ADC Sensor Assembly
The ADC Sensor Assembly consists of the ADC Sensor, ADC
Solenoid and others.
(a) ADC Sensor
The ADC (Automatic Density Control) Sensor detects the toner
density of the image on the drum's surface or toner density of
the drum's surface itself, and sends the density data to the
Process Control Unit.
(For more details, see Section 2.7.5.)
(b) ADC Solenoid
If the ADC Sensor light emitter or receptacle is dirty with toner,
the sensor cannot detect the toner density of the image or the
drum's surface. So, the ADC Sensor light emitter and receptacle
are cleaned by the cleaning lever when the ADC Solenoid is
activated.
Rev. B
2-29