Canon CP660, Service Manual

Page: 45 / 407

COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
F. Photosensitive Drum Cleaning
In the primary transfer step, not all toner on the photosensitive drum is transferred to
the intermediate transfer drum, but some remains on the drum. The same is true of the
secondary transfer step, in which not all toner on the intermediate transfer drum is trans-
ferred to paper—residual toner remains on the intermediate transfer drum after ITD
cleaning.
In the photosensitive drum cleaning block, the surface of the photosensitive drum is
cleaned in preparation for the next printing run, thus ensuring continuous reproduction of
sharp images.
Step 11 (photosensitive drum cleaning)
In this step, the residual toner on the drum surface is scraped off by a cleaning blade
in preparation for the next printing run. The scraped toner is collected by a scoop-up
sheet, and is sent to the waste toner case by the waste toner feeding roller 1, waste toner
feedscrew, and waste toner feeding roller 2.
CHAPTER 1 GENERAL DESCRIPTION
1-33
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Cleaning blade
Photosensitive drum
Waste toner
Stirring plate
Waste toner case
Waste toner feeding roller 2
Waste toner screw
Waste toner feeding roller 1
Scoop-up sheet
Figure 1-814
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