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CHAPTER 4 IMAGE FORMATION SYSTEM
COPYRIGHT
©
1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
4-23
Figure 4-201
a. Drum Cover Shutter
If exposed to strong light for a long time, the photosensitive drum can develop photo memory,
which can cause white spots or black bands on copies.
To prevent photo memory, the machine is equipped with a drum cover shutter. Do not open the
shutter unless absolutely necessary. It is designed to open when the cartridge is fit into the machine
and the machine's top unit is closed.
b. Light-Blocking Shutter
When the cartridge is removed from the machine, light makes its way through the opening used
to expose images. As in the case of the drum cover shutter, the light-blocking shutter is provided to
protect the photosensitive drum from light.
Cleaning blade
Drum cover shutter
Developing cylinder
Light-blocking shutter
Primary charging roller
Developing blade
Photosensitive
drum
A. Cartridge
1. Outline
The machine's photosensitive drum, primary charging roller, developing assembly, and cleaner
are housed in a single container referred to as a “cartridge.” (You cannot disassemble the cartridge.)