COPYRIGHT © 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHPTER 4 IMAGE FORMATION SYSTEM
4-17
II. CHARGING, DEVELOPING, AND CLEANING
II. SYSTEMS
A. Cartridge
1. Outline
The copier is a cartridge type, in that its photosensitive drum, primary charging
roller, developing assembly, and cleaner are designed as a single entity.
Figure 4-201A
a. Drum Cover Shutter
The photosensitive drum is susceptible to light; if exposed to strong light, it will
develop residual memory, causing white spots or black lines on the copies. To avoid
such problems, you must not open the drum cover shutter unless it is absolutely
necessary. The drum cover shutter is designed to open when the cartridge is inserted
into the copier and the copier’s top unit is closed.
b. Light-Blocking Shutter
The absence of a cartridge inside the copier allows light to enter the inside of the
copier from the opening created for exposure. The light-blocking shutter is provided to
protect the photosensitive drum against intrusion of such light.
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