Canon CP660 Service Manual page 31

8) Do not touch the two waste toner detecting windows of the drum cartridges.
9) Do not touch the protection shutter of the toner cartridge.
Y/M/C toner cartridge
COPYRIGHT © 1999 CANON INC.
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Toner detecting windows
Figure 1-702
Black toner cartridge
Protection shutter
Figure 1-703
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 1 GENERAL DESCRIPTION
Protection shutter
1-19