Canon MF4500 Series Service Manual

Canon MF4500 Series Service Manual Manual pdf 53 page image

22 2-282-28Technical Overview > Pickup And Feeding System > Detecting Jams > Delay JamsTechnical Overview > Pickup And Feeding System > Detecting Jams > Delay Jams■ Delay Jams● Delivery Delay JamThere are 3 types of delivery delay jam detections as follows:A. When there is no preceding paperB. When there is a preceding paper 1In the case of narrow paper interval with the preceding paperC. When there is a preceding paper 2In the case of wide paper interval with the preceding paperA. When there is no preceding paperIf the delivery sensor (PS701)detects no paper from 700 (1400) ms to 1235 (2470) ms afterdetection by the TOP sensor (PS751), a delivery delay jam is determined.OFFPaper Lead EdgeSensorFixing DeliverySensorONOFFONJam1035 paper detectionperiodNote :"700 (1400) ms" was calculated from the distance of 104.8 mm from the leading edgeof the TOP sensor (PS751) to the fixing nip. "1235 (2470) ms" was calculated fromthe distance of 135.5 mm from the leading edge of the TOP sensor (PS751) to that ofthe delivery sensor (PS701) and the delivery delay jam margin of 50 mm. Since thedistance from the fixing nip to the delivery sensor (PS701) is 30.7 mm, the length ofwrapping from the leading edge will be 80.7 mm. Since one lap of the film is 18.2π (57.2)mm, the length of wrapping is more than one lap. Considering paper looping, sensoraccuracy, and thick-paper delivery, however, the value cannot be made smaller.F-2-35B. When there is a preceding paper 1OFFPaper Lead EdgeSensorFixing DeliverySensorONOFFON103570JamWhen there is preceding paper at the delivery sensor (PS701) 700 (1400) ms after paperdetection by the TOP sensor (PS751) and the delivery sensor (PS701) does not detect theno-paper status until 1165 (2400) ms later, a delivery delay jam is determined.C. When there is a preceding paper 2103570OFFPaper Lead EdgeSensorFixing DeliverySensorONOFFONJampaper detectionperiodWhen there is preceding paper at the delivery sensor (PS701) 700 (1400) ms after paperdetection by the TOP sensor (PS751) and the delivery sensor (PS701) detects the no-paper status by 1165 (2400) ms later, a delivery delay jam is determined only if the deliverysensor (PS701) does not detect paper in the period from 70 ms after no paper detection bythe delivery sensor (PS701) until 1235 (2470) ms after paper detection by the TOP sensor(PS751).Note :"1165 (2400) ms" is the balance of subtracting a margin of 70 ms from the deliverydelay jam detection end time of 1235 (2470) ms by considering chattering from thetrailing edge of the preceding paper is at the delivery sensor until the leading edge ofthe next paper is detected.F-2-36F-2-37