COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)C. Locking the Developing RotaryWhen the cartridge moves to its point of removal, the stopper lever is pushed to thedeveloping rotary assembly to lock the developing rotary assembly in position.When the turret button (Figure 1-402) is pushed when replacing a color toner car-tridge, the developing rotary assembly rotates; then, as soon as the color toner cartridgestops at its position of removal, the DC controller PCB causes the developing rotary stop-per signal (STPROT) to go ‘1’ and the developing rotary stopper release signal (RLSROT)to go ‘0’ so that the developing rotary stopper solenoid (SL5) pushes against the stopperlever to lock the developing rotary in place.When the cartridge has been replaced and the toner cartridge cover has been closed,the DC controller PCB causes the developing rotary stopper signal (STPROT) to go ‘0’and the developing rotary stopper release signal (RLSROT) to go ‘1’ so that the stopperlever is pulled back to release the developing rotary.D. Detecting the Absence of the Toner CartridgesTo prevent the absence of a color toner cartridge, the machine is equipped with a car-tridge releasing lever sensor.This sensor is a reflection type sensor consisting of a light-emitting section and alight-receiving section. If the cartridge releasing lever is not set correctly, the light fromthe light-emitting section will be reflected by the cartridge releasing lever and detected bythe light-receiving assembly.The DC controller PCB monitors the cartridge releasing lever sensor with referenceto the timing at which the cartridge cover is closed; when the cartridge releasing leverdetection signal (RLOCKS) goes ‘0’, it communicates the fact to the printer board*1 asthe absence of a color cartridge, thereby stopping the machine and indicating a messageto this effect.*1 Reader controller PCB (when making prints with the reader unit installed).CHAPTER 4 IMAGE FORMATION SYSTEM4-14Download free service manual at http://printer1.blogspot.com
