Xerographics Ii - Epson AcuLaser C8500 Service Manual

EPSON AcuLaser C8500

2.5.6 Xerographics II

DRUM CARTRIDGE
The DRUM CARTRIDGE consists of the XERO. CARTRIDGE and WASTE
TONER BOX.
The XERO. CARTRIDGE consists of the drum, BCR and Cleaning Blade.
The drum is an aluminum cylinder coated with OPC (Organic Photo
Conductor) sensitive material. Because OPC sensitive material is
photoconductive (maintains charge in the dark, and acts as a
conductor to release the charge through earth when struck by light), it
forms an electrostatic latent image on the drum by laser scanning.
The BCR uniformly electrifies the surface of the drum in the
"Electrification" step of the print process.
The Cleaning Blade scrapes toner left over from "Primary Transfer" of
the print process from the surface of the drum.
The WASTE TONER BOX collects toner scraped from the surface of the
drum by the Cleaning Blade, and toner scraped from the IBT BELT ASSY
by the BELT CLEANER ASSY and brought in by the AUGER HIGH ASSY.
ERASE LAMP ASSY
The ERASE LAMP ASSY eliminates remaining charge by irradiating the
surface of the drum with light prior to being electrified by the BCR.
WASTE TONER SENSOR
The WASTE TONER SENSOR detects when the WASTE TONER BOX is full
of waste toner.
TONER BOX SENSOR
The TO N E R B O X S EN SO R detects w hether or not the W A S TE TO N ER B O X is
m ounted.
Operating Principles
ADC SENSOR ASSY
The ADC ASSY consists of the ADC Sensor and ADC Solenoid, ADC Sensor.
ADC Sensor
The ADC (Automatic Density Control) Sensor reads density of the toner
image on the surface of the drum and of the surface of the drum itself, and
feeds the information back to process control. (For details, see 2.7.6
"Process Control" in this chapter.)
ADC Solenoid
If the parts of the ADC Sensor that emit and receive light become dirty from
toner, etc., it becomes difficult to accurately measure the concentration of
the drum surface and toner image. The ADC Solenoid therefore actuates
and cleans the parts of the ADC Sensor that emit and receive light with the
cleaning lever.
Revision C
2-30