6.2.2 Laser Light Emission Control................................................................................................................. 6- 4

6.2.3 Laser Light Intensity Control .................................................................................................................. 6- 4

6.2.4 Image Masking Control........................................................................................................................... 6- 4

6.2.5 Failure Detection...................................................................................................................................... 6- 4

6.3 Controlling the Laser Scanner Motor........................................................................................................... 6- 5

6.3.1 Overview ................................................................................................................................................... 6- 5

6.3.2 Failure Detection...................................................................................................................................... 6- 5

6.4 Parts Replacement Procedure ..................................................................................................................... 6- 6

6.4.1 Laser/Scanner Unit .................................................................................................................................. 6- 6

6.4.1.1 Before Removing the Laser Scanner Unit .................................................................................... 6- 6

6.4.1.2 Removing the Laser Scanner Unit ................................................................................................. 6- 6

Chapter 7 Image Formation

7.1 Overview/Configuration ................................................................................................................................. 7- 1

7.1.1 Overview ................................................................................................................................................... 7- 1

7.1.2 Print Process ............................................................................................................................................ 7- 2

7.1.3 Electrostatic Latent Image Formation Block........................................................................................ 7- 3

7.1.4 Development Block.................................................................................................................................. 7- 4

7.1.5 Transfer Block .......................................................................................................................................... 7- 4

7.1.6 Fixing Block .............................................................................................................................................. 7- 6

7.1.7 Cleaning Block ......................................................................................................................................... 7- 6

7.2 Image Stabilization Control ........................................................................................................................... 7- 7

7.2.1 Overview ................................................................................................................................................... 7- 7

7.2.2 Environmental Change Corrective Control .......................................................................................... 7- 8

7.2.3 D-half Control ........................................................................................................................................... 7- 9

7.2.4 Color Displacement Corrective Control.............................................................................................. 7- 11

7.2.5 Auto Gradation Correction Control...................................................................................................... 7- 14

7.3 Toner Cartridge ............................................................................................................................................. 7- 15

7.3.1 Overview ................................................................................................................................................. 7- 15

7.3.2 Toner Level Detection........................................................................................................................... 7- 16

7.3.3 Memory Tag Control.............................................................................................................................. 7- 16

7.3.4 Toner Cartridge Detection .................................................................................................................... 7- 16

7.3.5 New Toner Cartridge Detection ........................................................................................................... 7- 17

7.3.6 Developing Cylinder Engagement/disengagement Control ............................................................ 7- 18

7.4 Transfer Unit.................................................................................................................................................. 7- 19

7.4.1 ETB Unit .................................................................................................................................................. 7- 19

7.4.2 Automatic Bias Control ......................................................................................................................... 7- 20

7.4.3 ETB Cleaning ......................................................................................................................................... 7- 21

7.4.4 Transfer Roller Engagement/disengagement Control ..................................................................... 7- 22

7.5 Parts Replacement Procedure ................................................................................................................... 7- 26

7.5.1 Drum Motor ............................................................................................................................................. 7- 26

7.5.1.1 Before Removing the Drum Motor ............................................................................................... 7- 26

7.5.1.2 Removing the Drum Motor ............................................................................................................ 7- 26

7.5.2 Main Drive Unit ....................................................................................................................................... 7- 26

7.5.2.1 Before Removing the Main Drive Unit ......................................................................................... 7- 26

7.5.2.2 Removing the Main Drive Unit ...................................................................................................... 7- 26

7.5.2.3 Point to Note When Installing the Main Drive Unit .................................................................... 7- 28

7.5.3 Developing Estrangement Solenoid .................................................................................................... 7- 30

Table of Contents