Canon DADF-M1 Service Manual page 21

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............................................................................................................................................... 2-2
2.1.3 Outputs from the ADF Driver PCB ............................................................................................................................................. 2-3
2.2 Basic Operation..............................................................................................................................................................2-4
2.2.1 Routes of Drive ............................................................................................................................................................................ 2-4
2.2.2 Overview of Operation Modes..................................................................................................................................................... 2-4
2.2.3 Normal Rotation Pickup/Reversal Operation (single-sided original -> signal-side print) .......................................................... 2-6
2.2.4 Normal Rotation Pickup/Delivery Operation (double-sided original -> double-sided print)...................................................... 2-7
2.2.5 Normal Rotation Pickup/Reversal Delivery (double-died original -> double-sided print) ....................................................... 2-13
2.2.6 Idle Feed/Reversal Pickup/Delivery (single-sided original of mixed configurations -> single-sided print) ............................. 2-15
2.3 Document Detection ....................................................................................................................................................2-17
2.3.1 Overview.................................................................................................................................................................................... 2-17
2.3.2 Checking the Presence/Absence of an Original......................................................................................................................... 2-18
2.3.3 Identifying the Size of the Original ........................................................................................................................................... 2-18
2.4 Document Pickup/Separation.......................................................................................................................................2-24
2.4.1 Basic Sequence of Operation ..................................................................................................................................................... 2-24
2.4.2 Pickup Unit and the Stopper ...................................................................................................................................................... 2-25
2.4.3 Timing of Pickup ....................................................................................................................................................................... 2-25
2.4.4 Controlling the Pickup Motor (M1) ........................................................................................................................................... 2-26
2.4.5 Controlling the Lock Motor (M4).............................................................................................................................................. 2-26
2.5 Document Reversing....................................................................................................................................................2-27
2.5.1 Basic Sequence of Operation ..................................................................................................................................................... 2-27
2.5.2 Sequence of Operation ............................................................................................................................................................... 2-28
2.5.3 Controlling the Delivery Reversal Motor (M3) ......................................................................................................................... 2-28
2.6 Document Feeding/Delivery ........................................................................................................................................2-28
2.6.1 Basic Sequence of Operation ..................................................................................................................................................... 2-28
2.6.2 Sequence of Operation ............................................................................................................................................................... 2-29
2.6.3 Controlling the Feed Motor ....................................................................................................................................................... 2-29
2.7 Detecting Jams .............................................................................................................................................................2-30
2.7.1 JAM............................................................................................................................................................................................ 2-30
2.8 Power Supply ...............................................................................................................................................................2-30
2.8.1 Power Supply ............................................................................................................................................................................. 2-30
2.9 Stamp Operation ..........................................................................................................................................................2-31
2.9.1 Overview.................................................................................................................................................................................... 2-31
Contents