Canon DADF-M1 Service Manual page 25

Contents
2.1 Basic Construction ............................................................................................................................................. 2-1
2.1.1 Overview of the Electrical Circuitry ........................................................................................................... 2-1
2.1.2 Inputs to the ADF Controller PCB .............................................................................................................. 2-1
2.1.3 Outputs from the ADF Driver PCB............................................................................................................. 2-2
2.2 Basic Operation .................................................................................................................................................. 2-4
2.2.1 Routes of Drive ........................................................................................................................................... 2-4
2.2.2 Overview of Operation Modes .................................................................................................................... 2-5
2.2.3 Normal Rotation Pickup/Reversal Operation (single-sided original .......................................................... 2-7
2.2.4 Normal Rotation Pickup/Delivery Operation (double-sided ...................................................................... 2-7
2.2.5 Normal Rotation Pickup/Reversal Delivery (double-died original -......................................................... 2-13
2.2.6 Idle Feed/Reversal Pickup/Delivery (single-sided original of ................................................................. 2-15
2.3 Document Detection......................................................................................................................................... 2-19
2.3.1 Overview ................................................................................................................................................... 2-19
2.3.2 Checking the Presence/Absence of an Original ........................................................................................ 2-20
2.3.3 Identifying the Size of the Original ........................................................................................................... 2-21
2.4 Document Pickup/Separation ........................................................................................................................... 2-29
2.4.1 Basic Sequence of Operation .................................................................................................................... 2-29
2.4.2 Pickup Unit and the Stopper...................................................................................................................... 2-31
2.4.3 Timing of Pickup....................................................................................................................................... 2-31
2.4.4 Controlling the Pickup Motor (M1) .......................................................................................................... 2-32
2.4.5 Controlling the Lock Motor (M4) ............................................................................................................. 2-32
2.5 Document Reversing ........................................................................................................................................ 2-34
2.5.1 Basic Sequence of Operation .................................................................................................................... 2-34
2.5.2 Sequence of Operation .............................................................................................................................. 2-35
2.5.3 Controlling the Delivery Reversal Motor (M3) ........................................................................................ 2-36
2.6 Document Feeding/Delivery ............................................................................................................................ 2-37
2.6.1 Basic Sequence of Operation .................................................................................................................... 2-37
2.6.2 Sequence of Operation .............................................................................................................................. 2-38
2.6.3 Controlling the Feed Motor ....................................................................................................................... 2-38
2.7 Detecting Jams ................................................................................................................................................. 2-39
2.7.1 JAM ........................................................................................................................................................... 2-39
2.8 Power Supply ................................................................................................................................................... 2-40
2.8.1 Power Supply ............................................................................................................................................ 2-40
2.9 Stamp Operation............................................................................................................................................... 2-41
2.9.1 Overview ................................................................................................................................................... 2-41
Contents