7.1 Construction ....................................................................................................................................................... 7-1

7.1.1 Specifications of the Image Formation System........................................................................................... 7-1

7.1.2 Major Components of the Image Formation System .................................................................................. 7-2

7.2 Image Formation Process ................................................................................................................................... 7-4

7.2.1 Image Formation Process (outline) ............................................................................................................. 7-4

7.2.2 Image Formation Process (image formation) .............................................................................................. 7-5

7.3 Basic Sequence................................................................................................................................................... 7-6

7.3.1 Sequence of Operation (initial rotation) ...................................................................................................... 7-6

7.3.2 Sequence of Operation (initial rotation) ...................................................................................................... 7-6

7.3.3 Sequence of Operation (copying)................................................................................................................ 7-7

7.3.4 Sequence of Operation (copying)................................................................................................................ 7-8

7.3.5 Sequence of Operation (last rotation).......................................................................................................... 7-8

7.3.6 Sequence of Operation (last rotation).......................................................................................................... 7-9

7.4 Image Stabilization Control.............................................................................................................................. 7-10

7.4.1 Overview ................................................................................................................................................... 7-10

7.4.2 APVC Control ........................................................................................................................................... 7-10

7.4.3 ATVC Control ........................................................................................................................................... 7-11

7.5 Drum Unit......................................................................................................................................................... 7-12

7.5.1 Charging Mechanism ................................................................................................................................ 7-12

7.5.1.1 Controlling the Primary Charging Bias.............................................................................................. 7-12

7.5.1.2 Primary Charging Roller Cleaning Mechanism ................................................................................. 7-12

7.6 Drum Cleaner Unit ........................................................................................................................................... 7-14

7.6.1 Photosensitive Drum Cleaning .................................................................................................................. 7-14

7.7 Developing Unit ............................................................................................................................................... 7-15

7.7.1 Controlling the Developing Bias ............................................................................................................... 7-15

7.8 Toner Container................................................................................................................................................ 7-16

7.8.1 Overview ................................................................................................................................................... 7-16

7.8.2 Route of Toner Supply .............................................................................................................................. 7-17

7.8.3 Controlling the Drive of the Toner Cartridge............................................................................................ 7-18

7.8.4 Toner Supply Control ................................................................................................................................ 7-19

7.8.5 Recovery Sequence ................................................................................................................................... 7-19

7.8.6 Toner Level Detection............................................................................................................................... 7-20

7.9 Transfer Unit .................................................................................................................................................... 7-21

7.9.1 Outline of the Transfer Unit ...................................................................................................................... 7-21

7.9.1.1 Outline ................................................................................................................................................ 7-21

7.9.2 Controlling the Transfer Bias .................................................................................................................... 7-21

7.9.2.1 Transfer Roller Bias Control .............................................................................................................. 7-21

7.9.3 Cleaning..................................................................................................................................................... 7-22

7.9.3.1 Transfer Roller Cleaning Mechanism ................................................................................................ 7-22

7.9.4 Separation Mechanism .............................................................................................................................. 7-22

7.9.4.1 Controlling the Static Eliminator Bias ............................................................................................... 7-22

7.10 Transfer Mechanism....................................................................................................................................... 7-23

7.10.1 Transfer Guide Bias................................................................................................................................. 7-23

7.10.1.1 Transfer Guide Bias Control ............................................................................................................ 7-23

Contents

Table of Contents