Canon DADF-N1 Service Manual page 21

Contents
2.1 Basic Construction .....................................................................................2-1
2.1.1 Outline of the Electrical Circuitry.......................................................2-1
2.1.2 Inputs to the ADF Controller PCB......................................................2-2
2.1.3 Output for the ADF Controller PCB ...................................................2-3
2.2 Basic Operation..........................................................................................2-4
2.2.1 Transmission of Drive.........................................................................2-4
2.2.2 Outline of the Operation Mode ...........................................................2-6
2.2.3 Normal Rotation Pickup/Delivery (single-sided ................................2-6
2.2.4 Normal Rotation Pickup/Reversal Delivery .......................................2-8
2.2.5 Idle Feed/Pickup/Delivery (double-sided originals .........................2-10
2.2.6 Idle Feeding/Reversal Pickup/Delivery (single- ...............................2-13
2.3 Document Detection.................................................................................2-16
2.3.1 Outline...............................................................................................2-16
2.3.2 Detecting the Presence/Absence of an Original................................2-17
2.3.3 Detecting the Last Original ...............................................................2-18
2.3.4 Original Size Initial Identification (feed direction)...........................2-19
2.3.5 Original Size Initial Identification (cross-feed .................................2-20
2.3.6 Slide Guide Positioning Spacer.........................................................2-23
2.3.7 Original Size Final Identification......................................................2-24
2.4 Document Pickup/Separation...................................................................2-27
2.4.1 Basic Operation .................................................................................2-27
2.4.2 Pickup Roller and the Stopper...........................................................2-30
2.4.3 Timing of Pickup ..............................................................................2-31
2.4.4 Controlling the Pickup Motor (M2) ..................................................2-32
2.5 Document Reversing................................................................................2-34
2.5.1 Basic Operation .................................................................................2-34
2.5.2 Sequence of Operation ......................................................................2-36
2.6 Document Feeding/Delivery ....................................................................2-37
2.6.1 Basic Operation .................................................................................2-37
2.6.2 Sequence of Operation ......................................................................2-38
2.6.3 Controlling the Feed Motor (M1) .....................................................2-38
2.7 Detecting Jams .........................................................................................2-40
Contents