COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)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.CHAPTER 1 GENERAL DESCRIPTION1-19Figure 1-702Toner detecting windowsFigure 1-703Protection shutterBlack toner cartridgeY/M/C toner cartridgeProtection shutterDownload free service manual at http://printer1.blogspot.com