2.5.3.2.1 Pick-up delay jam ................................................................................................................................................................................. 2-29

2.5.3.2.2 Delivery delay jam................................................................................................................................................................................ 2-29

2.5.3.2.3 Duplexing pick-up delay jam................................................................................................................................................................ 2-29

2.5.3.2.4 Duplexing reverse unit delay jam ......................................................................................................................................................... 2-30

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

2.5.3.3.1 Pick-up stationary jam .......................................................................................................................................................................... 2-30

2.5.3.3.2 Delivery stationary jam......................................................................................................................................................................... 2-30

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

2.5.3.4.1 Wrapping jam ....................................................................................................................................................................................... 2-30

2.5.3.4.2 Residual paper jam................................................................................................................................................................................ 2-30

2.5.3.4.3 Door open jam ...................................................................................................................................................................................... 2-30

2.5.3.4.4 Automatic delivery function ................................................................................................................................................................. 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

2.6.2.1.1 Heater 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

2.7.1.1.1 Low-voltage Power Supply Unit .......................................................................................................................................................... 2-36

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

2.7.1.2.1 Protective function ................................................................................................................................................................................ 2-37

2.7.1.2.2 Safety .................................................................................................................................................................................................... 2-37

2.7.1.2.3 Sleep 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

2.8.2.5 ETB motor failure detection ......................................................................................................................................................................... 2-40

2.8.2.6 Fixing motor failure detection ...................................................................................................................................................................... 2-40

2.8.2.7 Exhaust fan failure detection ........................................................................................................................................................................ 2-40

2.8.2.8 Duplexing cooling fan failure detection ....................................................................................................................................................... 2-41

2.8.3 Video Controller PCB................................................................................................................................................................ 2-41

2.8.3.1 Outline .......................................................................................................................................................................................................... 2-41

2.8.3.2 Overview....................................................................................................................................................................................................... 2-41

2.8.3.3 Outline of the Block...................................................................................................................................................................................... 2-42

2.8.3.4 Outline of the Block...................................................................................................................................................................................... 2-43

Table of Contents