Construction; Overview; Major Components - Canon iR6570 series Service Manual

7.1 Construction

7.1.1 Overview

The following shows the functions of and the methods used by the machine's image formation system:
Item
Photosensitive drum
Developing assembly
Pre-exposure
Potential sensor
wire auto cleaning
Primary charging control
Grid bias control
Developing bias control
dust-collecting roller bias
control
pre-transfer charging control AC constant voltage control: fuzzy control by environment sensor
Transfer charging control
Separation charging control

7.1.2 Major Components

The following shows the major components of the machine's image formation system:
Cleaner unit
T-7-1
Description
amorphous silicon (80-mm dia.)
cleaning: by blade
developing cylinder (24.5-mm dia.)
developing method: dry, 1-component toner projection
toner: magnetic negative toner
LED array
on/off control
potential control
[1] sets primary current
[2] sets laser output
[3] sets developing bias (DC)
[1] primary charging wire
[2] pre-transfer charging wire
[3] transfer charging wire
[4] separation charging wire
DC constant current control: set by result of potential control
fixed voltage control; fixed by varistor
AC constant voltage control: on/off control only
DC constant voltage control: set by result of potential control
DC non-control
DC constant current control: on/off only
DC constant current control: fuzzy control by environment sensor
AC constant voltage control
DC constant current control: fuzzy control based on output of environment sensor
and drum surface potential
Primary charging assembly
Potential sensor
Pre-exposure
Separation charging assembly
Transfer charging assembly
F-7-1
Developing assembly
Dust-colleting roller
Pre-transfer charging assembly
Transfer guide
Chapter 7
0009-3488
0009-3533
7-1