Canon DADF-AA1 Service Manual page 37

Contents
3.1 Basic Construction......................................................................................................................................................... 3-1
3.1.1 Outline of Electric Circuits .......................................................................................................................................................... 3-1
3.2 Basic Operation ............................................................................................................................................................. 3-1
3.2.1 Drive Mechanism and Signals...................................................................................................................................................... 3-1
3.2.2 Outline of Operation Modes......................................................................................................................................................... 3-2
3.2.3 Forward Pickup/Delivery (Single-sided Document -> Simplex Printing) Operation .................................................................. 3-3
3.2.4 Forward Pickup/Reverse Delivery (Double-sided Document -> Duplex Printing) Operation .................................................... 3-5
3.3 Document Detection ...................................................................................................................................................... 3-8
3.3.1 Outline.......................................................................................................................................................................................... 3-8
3.3.2 Document Presence/Absence Detection....................................................................................................................................... 3-9
3.3.3 Detection of Last Document ........................................................................................................................................................ 3-9
3.3.4 Initial Document Size Detection .................................................................................................................................................. 3-9
3.4 Document Pickup/Separation ...................................................................................................................................... 3-10
3.4.1 Basic Pickup Operation.............................................................................................................................................................. 3-10
3.4.2 Pickup Unit and Stopper ............................................................................................................................................................ 3-11
3.4.3 Pickup Timing ............................................................................................................................................................................ 3-12
3.4.4 Pickup/Feed Motor (M1) Control .............................................................................................................................................. 3-12
3.5 Document Reversing ................................................................................................................................................... 3-13
3.5.1 Basic Operation .......................................................................................................................................................................... 3-13
3.5.2 Operation Sequence.................................................................................................................................................................... 3-14
3.6 Document Feeding/Delivery........................................................................................................................................ 3-14
3.6.1 Basic Operation .......................................................................................................................................................................... 3-14
3.6.2 Release Operation ...................................................................................................................................................................... 3-15
3.6.3 Operation Sequence.................................................................................................................................................................... 3-16
3.6.4 Release motor (M2) Control ...................................................................................................................................................... 3-16
3.7 Detecting Jams............................................................................................................................................................. 3-17
3.7.1 Jams............................................................................................................................................................................................ 3-17
3.8 Power Supply............................................................................................................................................................... 3-17
3.8.1 Power Supply ............................................................................................................................................................................. 3-17
3.9 Stamp Operation .......................................................................................................................................................... 3-18
3.9.1 Outline (with the Stamp Unit-B1).............................................................................................................................................. 3-18
3.10 Fan ............................................................................................................................................................................. 3-18
3.10.1 Fan Operation........................................................................................................................................................................... 3-18
Contents