Transfer Block - Canon CP660 Service Manual

D.

Transfer Block

In this block, the toner image on the surface of the photosensitive drum is transferred
to paper by way of the intermediate transfer drum.
Step 5 (primary transfer)
The intermediate transfer drum is charged to positive potential from its inside to move
the toner from the surface of the photosensitive drum to the intermediate transfer drum.
This process is repeated for each color (Y, M, C, Bk) in sequence.
A DC bias (positive) is applied to the intermediate transfer drum during printing oper-
ation.
In the case of printing in full color, four layers of toner (four colors) are deposited on
the intermediate transfer drum ready for primary transfer, requiring strengthening toner
transfer for the second and subsequent colors, as toner with negative potential will
increase on the intermediate transfer drum. To this end, the DC bias (positive) is
increased for the second and the subsequent colors when printing in full color.
Photosensitive
COPYRIGHT © 1999 CANON INC.
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Toner
drum
DC bias
Figure 1-808
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 1 GENERAL DESCRIPTION
Intermediate transfer drum
Conducting layer
Aluminum layer
1-27