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

7.5.3.1 Before Removing the Developing Disengage Solenoid ............................................................................................................................... 7-30

7.5.3.2 Removing the Developing Disengage Solenoid ........................................................................................................................................... 7-30

7.5.3.3 Points to Note When Installing the Developing Disengage Solenoid .......................................................................................................... 7-31

7.5.4 ETB Unit .................................................................................................................................................................................... 7-31

7.5.4.1 Removing the ETB Unit ............................................................................................................................................................................... 7-31

7.5.5 ETB Motor ................................................................................................................................................................................. 7-32

7.5.5.1 Before Removing the ETB Motor................................................................................................................................................................. 7-32

7.5.5.2 Removing the ETB Motor ............................................................................................................................................................................ 7-32

7.5.6 ETB Estrangement Solenoid ...................................................................................................................................................... 7-33

7.5.6.1 Before Removing the ETB Disengage Solenoid........................................................................................................................................... 7-33

7.5.6.2 Removing the ETB Disengage Solenoid ...................................................................................................................................................... 7-33

7.5.7 Color Displacement/Image Density Sensor ............................................................................................................................... 7-34

Contents

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