Canon DADF-AA1 Service Manual page 8

Contents
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
Chapter 4 Parts Replacement Procedure
4.1 Points to Note on Disassembly and Reassembly...................................................................................... 4- 1
4.1.1 Points to Note When Turning Off the Main Power of the Host Machine......................................... 4- 1
4.2 External Covers............................................................................................................................................... 4- 1
4.2.1 Front Cover ............................................................................................................................................... 4- 1
4.2.1.1 Removing the Front Cove ............................................................................................................... 4- 1
4.2.2 Rear Cover ................................................................................................................................................ 4- 1
4.2.2.1 Removing the Rear Cover............................................................................................................... 4- 1
4.2.3 Feeder Cover ............................................................................................................................................ 4- 1
4.2.3.1 Removing the Feeder Cover........................................................................................................... 4- 1
4.3 Drive System ................................................................................................................................................... 4- 1
4.3.1 Pickup Motor ............................................................................................................................................. 4- 1
4.3.1.1 Removing the Pickup/Feed Motor.................................................................................................. 4- 1
4.3.2 Engaging Motor ........................................................................................................................................ 4- 2
4.3.2.1 Removing the Release Motor ......................................................................................................... 4- 2
4.3.3 Timing Belt/Pulley..................................................................................................................................... 4- 2
4.3.3.1 Removing the Timing Belt ............................................................................................................... 4- 2
4.3.4 Pickup Clutch ............................................................................................................................................ 4- 3
4.3.4.1 Removing the Pickup Clutch.......................................................................................................... 4- 3
4.3.5 Registration Clutch................................................................................................................................... 4- 3
4.3.5.1 Removing the Registration Clutch ................................................................................................. 4- 3
4.4 Document Feeding System........................................................................................................................... 4- 4
4.4.1 Pickup Roller Unit..................................................................................................................................... 4- 4