COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)D. Monitoring the Waste Toner CaseThe toner inside the waste toner case is monitored by the waste toner detectingassembly mounted to the drum cartridge.The detecting assembly consists of a light-emitting section and a light-receiving sec-tion. The light generated by the light-emitting section is directed to the detecting windowof the drum cartridge. It moves through the cartridge when the stirring plate inside movestoner away from around the detecting widow. The light is then detected by the light-receiv-ing section through the waste toner case; the DC controller PCB finds out the time towhen waste toner once again covers the detecting window.When the period during which light is passing through is shorter than a specific value,the DC controller PCB will identify the fact as a waste toner full warning condition, andcommunicates it to the printer board1. It also writes the data to the drum cartridge mem-ory.The copier remains capable of making copies after the warning, but the DC controllerPCB starts counting the prints made since the warning has been issued; it will identify awaste toner full condition when the count reaches a specific value, and will stop themachine and communicates the fact to the printer board*1.*1 Reader controller PCB (when making prints with the reader unit installed).Reference:COPIER>DISPLAY>SENSOR>W-TONER (indicated on the control panel if the read-er unit is installed)0: not full.1: full warning.Reference:E013: stops the machine in response to waste toner case full condition.E019: waste toner detecting assembly malfunction.Figure 4-203CHAPTER 4 IMAGE FORMATION SYSTEM4-9 Light-emittingsectionWaste tonerLight-receiving sectionDetectingwindowStirringplateToner feeding rollerPhotosensitive drumWaste toner detectingassemblyDownload free service manual at http://printer1.blogspot.com
