COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)VI. SERVICE MODEThe modes discussed herein are effective when the printer board (PS/PCL) isinstalled, and may be started on the control panel of the printer unit.A. Entering the Service ModeTo start service mode, turn on the printer unit while holding on the “Menu key,Enter/Online key, and Cancel key” on the control panel at the same time until “StartSELF-TEST” displays. The panel display will show “DISPLAY” to indicate that servicemode has started after the printer unit checks itself.B. Menu Structure and Key AssignmentThere are following keys on the printer control panel. Basic function of each key isalso described.Table 10-601CHAPTER 10 TROUBLESHOOTING10-83If the reader unit is installed, service mode must be started by operating on the con-trol panel of the Reader Unit. See the Reader Unit Service Manual.Caution:Name of the key Function in main menu Function in sub menuUP - change the item to previous valueDOWN - change the item to next valueLEFT - -RIGHT - -CANCEL exit service mode and reboot switch to main menuMENU switch to next item of main menu switch to main menuENTER/ONLINE enter sub menu display next item of sub menuDownload free service manual at http://printer1.blogspot.com