COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)• Duplexing UnitCHAPTER 1 GENERAL DESCRIPTION1-12qy t rw eq Reversing roller releasing platew Reversal paper sensore Re-pick up sensor leverr Duplexing feeding roller 2t Duplexing feeding roller 1y Reversing rollerFigure 1-406Download free service manual at http://printer1.blogspot.com