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...............................................................................................................................................7-3

7.2.1 Image Formation Process (outline) .............................................................................................................................................. 7-3

7.2.2 Image Formation Process (image formation) .............................................................................................................................. 7-4

7.3 Basic Sequence ..............................................................................................................................................................7-5

7.3.1 Sequence of Operation (initial rotation) ...................................................................................................................................... 7-5

7.3.2 Sequence of Operation (copying) ................................................................................................................................................ 7-5

7.3.3 Sequence of Operation (last rotation) .......................................................................................................................................... 7-6

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

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

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

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

7.4.4 PASCAL Control (image gradation) ........................................................................................................................................... 7-8

7.5 Drum Unit ......................................................................................................................................................................7-9

7.5.1 Outline of the Drum Unit ............................................................................................................................................................. 7-9

7.5.1.1 Configuration ..................................................................................................................................................................................................7-9

7.5.2 Charging Mechanism ................................................................................................................................................................. 7-10

7.5.2.1 Controlling the Primary Charging Bias.........................................................................................................................................................7-10

7.5.2.2 Primary Charging Roller Cleaning Mechanism ............................................................................................................................................7-10

7.6 Drum Cleaner Unit.......................................................................................................................................................7-10

7.6.1 Photosensitive Drum Cleaning .................................................................................................................................................. 7-10

7.7 Developing Unit...........................................................................................................................................................7-11

7.7.1 Configuration ............................................................................................................................................................................. 7-11

7.7.2 Controlling the Developing Bias ............................................................................................................................................... 7-11

7.8 Toner Container ...........................................................................................................................................................7-12

7.8.1 Configuration ............................................................................................................................................................................. 7-12

7.8.2 Route of Toner Supply............................................................................................................................................................... 7-13

7.8.3 Controlling the Drive of the Toner Cartridge ............................................................................................................................ 7-13

7.8.4 Toner Supply Control ................................................................................................................................................................ 7-14

7.8.5 Recovery Sequence .................................................................................................................................................................... 7-14

7.8.6 Toner Level Detection ............................................................................................................................................................... 7-14

7.9 Transfer Unit ................................................................................................................................................................7-15

7.9.1 Outline of the Transfer Unit....................................................................................................................................................... 7-15

7.9.1.1 Outline...........................................................................................................................................................................................................7-15

7.9.2 Controlling the Transfer Bias..................................................................................................................................................... 7-15

7.9.2.1 Transfer Roller Bias Control .........................................................................................................................................................................7-15

7.9.3 Cleaning ..................................................................................................................................................................................... 7-15

7.9.3.1 Transfer Roller Cleaning Mechanism ...........................................................................................................................................................7-15

7.9.4 Separation Mechanism............................................................................................................................................................... 7-15

7.9.4.1 Controlling the Static Eliminator Bias ..........................................................................................................................................................7-15

7.10 Transfer Mechanism ..................................................................................................................................................7-16

7.10.1 Transfer Guide Bias ................................................................................................................................................................. 7-16

7.10.1.1 Transfer Guide Bias Control .......................................................................................................................................................................7-16

7.11 Photosensitive Drum Cleaning...................................................................................................................................7-17

7.11.1 Outline...................................................................................................................................................................................... 7-17

7.11.2 Collection of Waste Toner ....................................................................................................................................................... 7-17

7.11.3 Checking the Waste Toner Box ............................................................................................................................................... 7-17

7.12 Parts Replacement Procedure.....................................................................................................................................7-18

Contents

Table of Contents