Canon MF4500 Series Service Manual

Canon MF4500 Series Service Manual Manual pdf 27 page image

22 2-22-2Technical Overview > Basic Configuration > Basic Sequence > Basic Sequence of OperationTechnical Overview > Basic Configuration > Basic Sequence > Basic Sequence of OperationBasic ConfigurationConfiguration functionThe machine may be broadly divided into the following 7 functional blocks: engine controlsystem, document exposure/feeding system, laser exposure system, image formation system,pickup/transport/delivery system, fixing system, and externals/auxiliary control system.Document exposure/Feeding systemExternal deviceEngine controlsystemLaser exposure systemPickup/transport/delivery systemImage formation systemFixing systemExternals and control systemF-2-1Basic Sequence■ Basic Sequence of OperationThe engine controller controls the operation sequence. The following table provides an outlineof machine operation occurring from when the power switch is turned on to when printingends and motors stop, indicating the purposes of intervals and engine operation. For detailsof various loads, see the timing chart.Interval Purpose RemarksWAIT(Wait)From power-ON until initialdrive for main motor iscompleted.To clear potential from the drumsurface and to clean the transferroller.Also to bring the heatertemperature up to the targetedtemperature.Detect whether theToner cartridge isinstalled or not.STBY(Standby)From the end of the WAITperiod or the LSTR perioduntil the print command issent from the main controller.Or, from the end of the LSTRperiod until power switch isturned OFF.To keep the printer ready toprint.INTR(initialrotation)From the input of the printcommand from the maincontroller until the pick-upsolenoid is turned ON.To stabilize the photosensitivedrum sensitivity in preparationfor printing. Also to clean thetransfer roller.PRINT(print)From the end of the INTRperiod until the top of pagesensor detects the trailingedge of paper.To form image on thephotosensitive drum basedon the VIDEO (/VD01, /VD02,VD01, VD02) signals inputfrom the main controller, and totransfer the toner image ontopaper.LSTR(lastrotation)From the end of PRINTperiod until the Main motorstops.To deliver the last papercompletely out of the printer.Return to the INTRperiod as soon asanother print commandis sent from the maincontroller.T-2-1