2.1 Functional Configuration ...............................................................................................................................................2-1

2.1.1 Outline.......................................................................................................................................................................................... 2-1

2.2 Basic Sequense...............................................................................................................................................................2-1

2.2.1 Basic Sequence of Operation ....................................................................................................................................................... 2-1

2.3 LASER EXPOSURE SYSTEM.....................................................................................................................................2-1

2.3.1 Overview/Configuration .............................................................................................................................................................. 2-1

2.3.1.1 Outline.............................................................................................................................................................................................................2-1

2.3.2 Laser Scanner Motor Control....................................................................................................................................................... 2-2

2.3.2.1 Fault Detection ................................................................................................................................................................................................2-2

2.4 IMAGE FORMATION SYSTEM .................................................................................................................................2-2

2.4.1 Overview/Configuration .............................................................................................................................................................. 2-2

2.4.1.1 Outline.............................................................................................................................................................................................................2-2

2.4.1.2 Image-formation Process ................................................................................................................................................................................2-3

2.4.1.3 Latent image formation block .........................................................................................................................................................................2-3

2.4.1.4 Development block .........................................................................................................................................................................................2-4

2.4.1.5 Transfer block .................................................................................................................................................................................................2-4

2.4.1.6 Fixing block ....................................................................................................................................................................................................2-5

2.4.1.7 ITB cleaning block ..........................................................................................................................................................................................2-6

2.4.1.8 Photosensitive drum cleaning block................................................................................................................................................................2-6

2.4.2 High-Voltage Control .................................................................................................................................................................. 2-7

2.4.2.1 Outline.............................................................................................................................................................................................................2-7

2.4.3 Image Stabilizaton Control .......................................................................................................................................................... 2-8

2.4.3.1 Overview of the Image Stabilization Control Mechanism..............................................................................................................................2-8

2.4.3.2 Image density correction control (D-max control)..........................................................................................................................................2-8

2.4.3.3 Image gradation correction control (D-half control).......................................................................................................................................2-9

2.4.3.4 Color displacement correction control ............................................................................................................................................................2-9

2.4.4 Drum Cartridge ............................................................................................................................................................................ 2-9

2.4.4.1 Developing roller engagement/disengagement control...................................................................................................................................2-9

2.4.5 Transfer Unit .............................................................................................................................................................................. 2-10

2.4.5.1 Pad transfer....................................................................................................................................................................................................2-10

2.5 Pickup/Feeding/Delivery System.................................................................................................................................2-11

2.5.1 Overview/Configuration ............................................................................................................................................................ 2-11

2.5.1.1 Overview .......................................................................................................................................................................................................2-11

2.5.2 Detecting Jams ........................................................................................................................................................................... 2-12

2.5.2.1 Jam Detection Outline...................................................................................................................................................................................2-12

2.5.2.1.1 Outline...................................................................................................................................................................................................2-12

2.5.2.2 Delay Jams ....................................................................................................................................................................................................2-12

2.5.2.2.1 Pickup delay jam 1 ................................................................................................................................................................................2-12

2.5.2.2.2 Pickup delay jam 2 ................................................................................................................................................................................2-12

2.5.2.2.3 Fixing delivery delay jam......................................................................................................................................................................2-12

2.5.2.3 Stationary Jams .............................................................................................................................................................................................2-12

2.5.2.3.1 Pickup stationary jam ............................................................................................................................................................................2-12

2.5.2.3.2 Fixing delivery stationary jam ..............................................................................................................................................................2-13

2.5.2.4 Other Jams.....................................................................................................................................................................................................2-13

2.5.2.4.1 Fixing wrapping-up jam ........................................................................................................................................................................2-13

2.5.2.4.2 Inside stationary jam 1 ..........................................................................................................................................................................2-13

2.5.2.4.3 Inside stationary jam 4 ..........................................................................................................................................................................2-13

2.5.2.4.4 Duplex re-pickup jam............................................................................................................................................................................2-13

2.5.2.4.5 Door open jam.......................................................................................................................................................................................2-13

2.5.3 Cassette Pickup .......................................................................................................................................................................... 2-13

2.5.3.1 Separation Roller Method .............................................................................................................................................................................2-13

2.6 FIXING UNIT SYSTEM.............................................................................................................................................2-14

2.6.1 Overview/Configuration ............................................................................................................................................................ 2-14

Contents

Table of Contents