Canon i-SENSYS MF4300dn Service Manual page 8

Contents
4.1.2 Basic Operation (DADF) ..........................................................................................................................................4- 2
4.1.3 Original Detection ....................................................................................................................................................4- 4
4.2 Detection Jams........................................................................................................................................... 4- 5
4.2.1 Jam Detection ..........................................................................................................................................................4- 5
4.3 ADF/DADF ................................................................................................................................................. 4- 6
4.3.1 Pick-up Roller...........................................................................................................................................................4- 6
4.3.1.1 Removing the ADF Pickup Roller ............................................................................................................................................ 4- 6
4.3.1.2 Removing the DADF Pickup Roller Unit .................................................................................................................................. 4- 6
4.3.2 ADF Motor................................................................................................................................................................4- 8
4.3.2.1 Preparation for Removing the ADF/DADF Motor..................................................................................................................... 4- 8
4.3.2.2 Removing the ADF Motor ........................................................................................................................................................ 4- 8
4.3.2.3 Removing the DADF Motor...................................................................................................................................................... 4- 9
4.3.3 Separation Pad ......................................................................................................................................................4- 12
4.3.3.1 Removing the ADF Separation Pad....................................................................................................................................... 4- 12
4.3.3.2 Removing the DADF Separation Pad .................................................................................................................................... 4- 12
Chapter 5 Laser Exposure
5.1 Overview/Configuration .............................................................................................................................. 5- 1
5.1.1 Overview ..................................................................................................................................................................5- 1
5.2 Controlling the Laser Activation Timing ...................................................................................................... 5- 2
5.2.1 Laser ON / OFF Control...........................................................................................................................................5- 2
5.3 Controlling the Intensity of Laser Light ....................................................................................................... 5- 2
5.3.1 Auto Photoelectric Current Control (APC) ...............................................................................................................5- 2
5.4 Controlling the Laser Scanner Motor.......................................................................................................... 5- 4
5.4.1 Overview ..................................................................................................................................................................5- 4
5.4.2 Scanner Motor Speed Control .................................................................................................................................5- 4
5.4.3 Detection of Fault of the Scanner Motor ..................................................................................................................5- 4
5.5 Parts Replacement Procedure ................................................................................................................... 5- 5
5.5.1 Laser/Scanner Unit ..................................................................................................................................................5- 5
5.5.1.1 Preparation for Removing the Laser Scanner Unit .................................................................................................................. 5- 5
5.5.1.2 Removing the Laser Scanner Unit ........................................................................................................................................... 5- 5
Chapter 6 Image Formation
6.1 Overview/Configuration .............................................................................................................................. 6- 1
6.1.1 Configuration............................................................................................................................................................6- 1
6.1.2 Print Process............................................................................................................................................................6- 1
6.2 Driving and Controlling the High-Voltage System ...................................................................................... 6- 2
6.2.1 Generation of Transfer Charging Bias .....................................................................................................................6- 2
6.3 Toner Cartridge .......................................................................................................................................... 6- 3
6.3.1 Toner Level Detection..............................................................................................................................................6- 3
6.4 Parts Replacement Procedure ................................................................................................................... 6- 4
6.4.1 Transfer Charging Roller..........................................................................................................................................6- 4
6.4.1.1 Removing the Transfer Charging Roller .................................................................................................................................. 6- 4
Chapter 7 Pickup and Feed System
7.1 Overview/Configuration .............................................................................................................................. 7- 1
7.1.1 Overview ..................................................................................................................................................................7- 1
7.2 Other Control .............................................................................................................................................. 7- 2
7.2.1 Overview ..................................................................................................................................................................7- 2
7.3 Detection Jams........................................................................................................................................... 7- 3
7.3.1 Jam Detection Outline..............................................................................................................................................7- 3
7.3.1.1 Overview .................................................................................................................................................................................. 7- 3
7.3.2 Delay Jams ..............................................................................................................................................................7- 3
7.3.2.1 Pickup Delay Jam .................................................................................................................................................................... 7- 3