COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)If PS3 detects any of the following as a fault in the developing rotary assembly, theDC controller PCB recognizes the fault and communicates the fact to the printer board*1to stop the machine.1) PS3 does not detect the home position flag.2) PS3 detects an error between rotation position flags.3) PS3 cannot detect a flag width different from the stop position flag.*1 Reader controller PCB (when making prints with the reader unit installed).Reference:E021: fault in the developing rotary assembly.CHAPTER 4 IMAGE FORMATION SYSTEM4-13Download free service manual at http://printer1.blogspot.com