2.4.1.2 Print Process............................................................................................................................................................................ 2- 7

2.4.1.3 Electrostatic latent image formation block ............................................................................................................................... 2- 8

2.4.1.4 Development block .................................................................................................................................................................. 2- 9

2.4.1.5 Transfer block ........................................................................................................................................................................ 2- 10

2.4.1.6 Fixing block ............................................................................................................................................................................ 2- 11

2.4.1.7 Cleaning block ....................................................................................................................................................................... 2- 12

2.4.2 Image Stabilizaton Control.....................................................................................................................................2- 12

2.4.2.1 Image Stabilization Control .................................................................................................................................................... 2- 12

2.4.2.2 Environment related corrective control .................................................................................................................................. 2- 12

2.4.2.3 Color gradation corrective control .......................................................................................................................................... 2- 13

2.4.2.4 Color Misregistration Corrective Control ................................................................................................................................ 2- 14

2.4.3 Toner Cartridge......................................................................................................................................................2- 16

2.4.3.1 Outline.................................................................................................................................................................................... 2- 16

2.4.3.2 Memory tag ............................................................................................................................................................................ 2- 17

2.4.3.3 Cartridge presence detection................................................................................................................................................. 2- 17

2.4.3.4 Developing roller engagement/disengagement control.......................................................................................................... 2- 17

2.4.4 Transfer Unit ..........................................................................................................................................................2- 18

2.4.4.1 ETB Unit................................................................................................................................................................................. 2- 18

2.4.4.2 Automatic bias control............................................................................................................................................................ 2- 19

2.4.4.3 ETB cleaning.......................................................................................................................................................................... 2- 20

2.4.4.4 Transfer roller engagement/disengagement control .............................................................................................................. 2- 21

2.5 Pickup/Feeding/Delivery System.............................................................................................................. 2- 24

2.5.1 Overview/Configuration..........................................................................................................................................2- 24

2.5.1.1 Outline.................................................................................................................................................................................... 2- 24

2.5.2 Other Control .........................................................................................................................................................2- 25

2.5.2.1 Cassette pick-up mechanism................................................................................................................................................. 2- 25

2.5.2.2 Multi-purpose tray (MPT) pick-up........................................................................................................................................... 2- 26

2.5.2.3 Skew correction by the registration shutter............................................................................................................................ 2- 27

2.5.2.4 Transport Speed Control........................................................................................................................................................ 2- 27

2.5.2.5 Warp control........................................................................................................................................................................... 2- 28

2.5.2.6 Fixing roller pressurizing/release control ............................................................................................................................... 2- 28

2.5.3 Detecting Jams ......................................................................................................................................................2- 29

2.5.3.1 Jam Detection Outline............................................................................................................................................................ 2- 29

2.5.3.2 Delay Jams ............................................................................................................................................................................ 2- 29

2.5.3.3 Stationary Jams ..................................................................................................................................................................... 2- 30

2.5.3.4 Other Jams ............................................................................................................................................................................ 2- 30

2.5.4 Duplex Feeding......................................................................................................................................................2- 30

2.5.4.1 Outline.................................................................................................................................................................................... 2- 30

2.5.4.2 Duplexing reverse/feed operation .......................................................................................................................................... 2- 31

2.5.4.3 Duplexing pick-up operation .................................................................................................................................................. 2- 33

2.6 FIXING UNIT SYSTEM ............................................................................................................................ 2- 34

2.6.1 Overview/Configuration..........................................................................................................................................2- 34

2.6.1.1 Outline.................................................................................................................................................................................... 2- 34

2.6.2 Various Control Mechanisms .................................................................................................................................2- 35

2.6.2.1 Fixing Temperature Control ................................................................................................................................................... 2- 35

2.6.3 Protective Functions ..............................................................................................................................................2- 36

2.6.3.1 outline .................................................................................................................................................................................... 2- 36

2.6.3.2 Failure detection .................................................................................................................................................................... 2- 36

2.7 EXTERNAL AND CONTROLS SYSTEM ................................................................................................. 2- 36

2.7.1 Power Supply.........................................................................................................................................................2- 36

2.7.1.1 Power Supply......................................................................................................................................................................... 2- 36

2.7.1.2 Other Function ....................................................................................................................................................................... 2- 37

2.8 ENGINE CONTROL SYSTEM ................................................................................................................. 2- 38

2.8.1 Construction...........................................................................................................................................................2- 38

2.8.1.1 Outline.................................................................................................................................................................................... 2- 38

2.8.2 DC Controller .........................................................................................................................................................2- 38

2.8.2.1 Outline.................................................................................................................................................................................... 2- 38

2.8.2.2 Operation of each block ......................................................................................................................................................... 2- 39

2.8.2.3 Fan/Motor Control .................................................................................................................................................................. 2- 40

2.8.2.4 Drum motor failure detection.................................................................................................................................................. 2- 40

Table of Contents