Service manual

Contents
2.3.6 Drum Cartridge .......................................................................................................................................................................... 2-21
2.3.6.1 Outline .......................................................................................................................................................................................................... 2-21
2.3.6.2 Cleaning Roller Engaging Control ............................................................................................................................................................... 2-22
2.3.6.3 Memory Tag ................................................................................................................................................................................................. 2-23
2.3.6.4 Detecting the ITB Home Position................................................................................................................................................................. 2-24
2.3.6.5 Drum Cartridge Presence Detection ............................................................................................................................................................. 2-25
2.3.6.6 Checking the Life of the Drum Cartridge..................................................................................................................................................... 2-26
2.3.7 Secondary Transfer Mechanism ................................................................................................................................................ 2-27
2.3.7.1 Outline .......................................................................................................................................................................................................... 2-27
2.3.7.2 Secondary Transfer Roller Engaging Control .............................................................................................................................................. 2-28
2.3.7.3 Secondary Roller Position Detection............................................................................................................................................................ 2-29
2.4 Pickup and Feed System.............................................................................................................................................. 2-30
2.4.1 Overview/Configuration ............................................................................................................................................................ 2-30
2.4.1.1 Overview....................................................................................................................................................................................................... 2-30
2.4.1.2 Pickup/Feeding Assembly ............................................................................................................................................................................ 2-31
2.4.2 Other Control ............................................................................................................................................................................. 2-32
2.4.2.1 Skew Correction Function ............................................................................................................................................................................ 2-32
2.4.2.2 Feed Speed Control....................................................................................................................................................................................... 2-32
2.4.2.3 Detecting the Machine Inside Temperature.................................................................................................................................................. 2-32
2.4.3 Detection Jams........................................................................................................................................................................... 2-33
2.4.3.1 Jam Detection Outline .................................................................................................................................................................................. 2-33
2.4.3.1.1 Outline .................................................................................................................................................................................................. 2-33
2.4.3.2 Delay Jams.................................................................................................................................................................................................... 2-33
2.4.3.2.1 Pickup Delay Jam ................................................................................................................................................................................. 2-33
2.4.3.2.2 Delivery Delay Jam............................................................................................................................................................................... 2-33
2.4.3.3 Stationary Jams ............................................................................................................................................................................................. 2-33
2.4.3.3.1 Pick-up Stationary Jam ......................................................................................................................................................................... 2-33
2.4.3.3.2 Delivery Stationary Jam........................................................................................................................................................................ 2-33
2.4.3.4 Other Jams .................................................................................................................................................................................................... 2-33
2.4.3.4.1 Fixing Unit Wrapping Jam ................................................................................................................................................................... 2-33
2.4.3.4.2 Door Open Jam ..................................................................................................................................................................................... 2-33
2.4.3.4.3 Residual Paper Jam ............................................................................................................................................................................... 2-33
2.4.4 Cassette Pickup Unit.................................................................................................................................................................. 2-34
2.4.4.1 Pickup from the Cassette .............................................................................................................................................................................. 2-34
2.4.5 Manual Feed Pickup Unit .......................................................................................................................................................... 2-34
2.4.5.1 Multi-purpose Tray Pick-up.......................................................................................................................................................................... 2-34
2.5 Fixing Unit .................................................................................................................................................................. 2-34
2.5.1 Overview/Configuration ............................................................................................................................................................ 2-34
2.5.1.1 Outline .......................................................................................................................................................................................................... 2-34
2.5.2 Various Control Mechanisms .................................................................................................................................................... 2-35
2.5.2.1 Controlling the Temperature of the Fixing Unit........................................................................................................................................... 2-35
2.5.2.1.1 Heater Temperature Control ................................................................................................................................................................. 2-35
2.5.3 Protection Function.................................................................................................................................................................... 2-35
2.5.3.1 Flicker prevention function........................................................................................................................................................................... 2-35
2.5.3.2 Protective Function ....................................................................................................................................................................................... 2-35
2.5.3.3 Fixing Unit Failure Detection ....................................................................................................................................................................... 2-36
2.6 Engine Control System................................................................................................................................................ 2-36
2.6.1 Construction............................................................................................................................................................................... 2-36
2.6.1.1 Overview....................................................................................................................................................................................................... 2-36
2.6.2 DC Controller (DCNT).............................................................................................................................................................. 2-37
2.6.2.1 Outline .......................................................................................................................................................................................................... 2-37
2.6.2.2 Operations..................................................................................................................................................................................................... 2-37
2.6.2.3 Controlling the Motors and Fans .................................................................................................................................................................. 2-38
2.6.2.4 Main Motor Control...................................................................................................................................................................................... 2-38
2.6.2.5 Developing Rotary Motor Control................................................................................................................................................................ 2-39
2.6.2.6 Cooling Fan................................................................................................................................................................................................... 2-40
2.6.3 System Controller (SCNT) ........................................................................................................................................................ 2-41
2.6.3.1 Outline .......................................................................................................................................................................................................... 2-41
2.6.3.2 Canon Advanced Printing Technology (CARPS) ..................................................................................................................................... 2-41