31 March, 1999
PCU (PHOTOCONDUCTOR UNIT)
2-7
Detailed
Descriptions
2.2.2 COMPONENTS
Section
Component
Overview
Cleaning unit
The main motor (a brushless DC motor)
drives the used toner collection unit and the
cleaning unit.
Drive mechanism
Belt drive
The PCU motor (an externally synchronized
brushless DC motor) drives the OPC belt
and the transfer belt.
OPC belt
292 mm in circumference
Cleaning unit
A counter blade scrapes the OPC belt to
remove excessive toner.
OPC
Lubricant bar
This applies lubricant to the OPC surface to
improve toner removal.
Charge corona unit
The scorotron corona wire inside the charge
corona unit evenly charges the OPC
surface.
Charge corona unit
Charge inlet fan
The charge inlet fan blows air into the
charge corona unit to disperse ozone.
Transfer belt
The toner image on the OPC belt is
transferred onto the transfer belt. Later it will
be transferred to the paper from the belt.
Transfer bias
The transfer bias attracts the toner from the
OPC to the transfer belt surface.
Cleaning unit
A counter blade scrapes the transfer belt to
remove toner.
ID sensor
The ID sensor detects the density of the
black and color patterns on the transfer belt
surface.
Primary transfer
section
Lubricant bar
This applies lubricant to the transfer belt
surface to improve toner separation from the
belt.
Used toner tank
This collects the used toner from the OPC
and belt transfer sections.
Used toner
Used toner sensor
The used toner sensor detects when the
used toner tank is full.
Quenching
Quenching lamp
Light from a red LED removes residual
charge from the OPC belt in preparation for
receiving the next image.
