COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 8 INSTALLATION8-18No.56WorkHold the duplexing unit as shown, and insertit into the slot for the duplexing unit. (Wheninserting it halfway, put your thumbs on itsboth sides; then, push it fully inside.)Close the printer unit delivery cover. (Besure to push with both hands until a click isheard, indicating that it has locked intoplace.)RemarksDo not push on the metal plate at theback of the duplexing unit; otherwise,the plate may deform to cause pick-upfaults or jams.Caution:Download free service manual at http://printer1.blogspot.com