Canon CP660 Service Manual page 44

CHAPTER 1 GENERAL DESCRIPTION
Step 10 (intermediate transfer drum cleaning)
In this step, different biases are applied to the intermediate transfer drum and the pho-
tosensitive drum to return the residual toner (charged to a uniform potential by the clean-
ing roller) existing on the intermediate transfer drum back to the photosensitive drum. The
resulting difference in potential between the photosensitive drum and the intermediate
transfer drum causes the residual toner to move from the intermediate transfer drum to
the transfer drum.
Primary charging
bias
Charged residual toner
ITD cleaning roller
ITD cleaning cam
Intermediate transfer drum potential > Photosensitive drum potential
1-32
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Primary charging roller
Photosensitive drum
Intermediate transfer
Figure 1-813
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Waste toner case
drum
DC bias
Photosensitive
drum cartridge