Canon MF4500 Series Service Manual

Canon MF4500 Series Service Manual Manual pdf 46 page image

22 2-212-21Technical Overview > Image Formation System > Service Works > Notes on service worksTechnical Overview > Image Formation System > Service Works > Notes on service works■ Toner Cartridge Absence/Presence DetectionThe engine controller detects the position of the Toner cartridge detection flag to judge theabsence/presence of the Toner cartridge.At the time of turning on the power or closing the upper cover, the engine controller judgesthe position of the Toner cartridge flag based on the output result of the leading edge sensor(PS751).When the output result of the leading edge sensor (PS751) is L, it is judged that the Tonercartridge is absent; If being H, it is judged that the Toner cartridge is present.Engine controllerPS751="H"Toner cartridgedetection flagLeading edgesensor detection flagPS751PS751="L"Tonercartridge=YesTonercartridge=NoThe leading edge sensor performs both this detection and paper feed detection. Therefore,the engine controller cannot make a judgment of ‘Toner cartridge absent’ or ‘jam occurrence’when jam occurs.The engine controller judges this case as ‘Toner cartridge absent’ and notices it to the maincontroller.F-2-28If jam occurs when ‘Toner cartridge absent’ is detected, check if there is a fault in the leadingedge sensor and the detection flag.Service Works■ At parts replacementNo work is required for this product at parts replacement.■ MaintenanceNo periodically replaced parts, durable parts or periodical service is set for this product.■ Notes on service worksNone.