Canon MF4500 Series Service Manual

Canon MF4500 Series Service Manual Manual pdf 56 page image

22 2-312-31Technical Overview > Pickup And Feeding System > Detecting Jams > Other JamsTechnical Overview > Pickup And Feeding System > Detecting Jams > Other Jams■ Other Jams● Fixing Wrap Jamfixing wrap jamdetection period50OFFPaper Lead EdgeSensorFixing DeliverySensorONOFFON635A fixing wrap jam is determined if the Fixing Delivery Sensor (PS701) detects absenceof paper between the time of 50 msec after the Fixing Delivery Sensor (PS701) detectedpresence of paper and the time of 635 msec after the Paper Lead Edge Sensor (PS751)detected absence of paper.Note :The leading edge detection margin is 8 mm and the trailing edge detection margin is 20mm. The leading edge margin is set to prevent the erroneous detection of a wrappingjam during chattering at paper entry. The trailing edge margin is set long because thedetection time is not stable due to paper springing or other.● Initial Paper Jam during printingAn initial paper jam is determined if either the Fixing Delivery Sensor (PS701) or the PaperWidth Sensor (PS702) detects presence of paper immediately before the Print Main Motorstarted its rotation.● Door Open JamA door open jam is determined when printing is interrupted due to the door open detectionduring printing while there is paper at the Paper Lead Edge Sensor (PS751) or the FixingDelivery Sensor (PS702). The status value is retained if any jam has been already reported tothe jam status.● Initial paper presence Jam during warm-up rotationIf either the delivery sensor (PS701) or the paper width sensor (PS702) detects paper at thestart of warm-up rotation, an initial paper presence jam is determined.F-2-39● No-paper detection during cleaningOFFSolenoidPaper Lead EdgeSensorONOFFONJam200paper detectionperiod1370If the TOP sensor (PS751) does not detect paper for 1370 ms from 200 ms after the start ofpaper feed, the no-paper status is determined.F-2-40