Canon PC300 Service Manual page 23

Step 2 image Exposure
Optical image
1 {|
Dark area | Light area
Figure 2-6
The optical image from the document is
directed to the surface of the photosensitive
drum, thereby neutralizing the charges in
light areas.
Step 3 Development
Magnet J cylinder
Figure 2-7
(black developing assembly)
As shown in Figure 2-7, the developing
assembly is composed of the developing
cylinder and rubber blade; the developing
cylinder in turn consists of.a fixed magnet
and a cylinder that revolves around it.
COPYRIGHT © 1994 CANONINC.
Cele
= COPYING PROCESS
The black developer is a single-compo-
nent developing agent, made up of mag-
netite and resin. The developer has insulat-
ing properties, and becomes charged to a
positive potential by friction against the rotat-
ing cylinder and blade.
The color developer is also a single-
component developing agent, made mostly
of resin.
The developer is collected around the
blade by the brushing roller. In addition to
collecting the developer, it also brushes
developer off the developing cylinder; see
Figure 2-8.
Blade
Developing cylinder
Brushing
roller
Figure 2-8
The developer is moved between the
rotating developing cylinder and blade,
charged to a positive potential, and is
deposited in a uniform layer on the cylinder
by the blade.
CANON PC300920(225, F0210290 REV.0 JULY 1994 PRINTED IN JAPAN (MPRIME AU JAPON) 2-3