Canon iR2020 Series Service Manual page 185

Contents
8.1 Construction ....................................................................................................................................................... 8-1
8.1.1 Specifications, Control Mechanisms, and Functions .................................................................................. 8-1
8.1.2 Major Components ...................................................................................................................................... 8-2
8.2 Various Control Mechanisms............................................................................................................................. 8-3
8.2.1 Controlling the Speed of the Fixing Film.................................................................................................... 8-3
8.2.1.1 Controlling the Fixing Film Speed ....................................................................................................... 8-3
8.2.2 Controlling the Fixing Film Temperature ................................................................................................... 8-3
8.2.2.1 Outline .................................................................................................................................................. 8-3
8.2.2.2 Controlling the Fixing Film Temperature ............................................................................................ 8-3
8.2.2.3 Target Temperatures by Mode ............................................................................................................. 8-4
8.2.3 Detecting the Passage of Paper ................................................................................................................... 8-4
8.2.3.1 Detecting the Passage of Paper............................................................................................................. 8-4
8.3 Protective Functions ........................................................................................................................................... 8-5
8.3.1 Protective Functions .................................................................................................................................... 8-5
8.4 Parts Replacement Procedure............................................................................................................................. 8-7
8.4.1 Fixing Unit .................................................................................................................................................. 8-7
8.4.1.1 Removing the Drum Unit ..................................................................................................................... 8-7
8.4.1.2 Removing the rear cover ...................................................................................................................... 8-7
8.4.1.3 Removing the Left Cover (Rear).......................................................................................................... 8-7
8.4.1.4 Removing the Left Door....................................................................................................................... 8-7
8.4.1.5 Removing the Fixing Unit .................................................................................................................... 8-8
8.4.2 Pressure Roller ............................................................................................................................................ 8-9
8.4.2.1 Removing the Drum Unit ..................................................................................................................... 8-9
8.4.2.2 Removing the rear cover ...................................................................................................................... 8-9
8.4.2.3 Removing the Left Cover (Rear).......................................................................................................... 8-9
8.4.2.4 Removing the Left Door....................................................................................................................... 8-9
8.4.2.5 Removing the Fixing Unit .................................................................................................................. 8-10
8.4.2.6 Removing the Fixing Film Unit ......................................................................................................... 8-10
8.4.2.7 Removing the Pressure Roller ............................................................................................................ 8-12
8.4.3 Fixing Film ................................................................................................................................................ 8-13
8.4.3.1 Removing the Drum Unit ................................................................................................................... 8-13
8.4.3.2 Removing the rear cover .................................................................................................................... 8-13
8.4.3.3 Removing the Left Cover (Rear)........................................................................................................ 8-13
8.4.3.4 Removing the Left Door..................................................................................................................... 8-13
8.4.3.5 Removing the Fixing Unit .................................................................................................................. 8-14
8.4.3.6 Removing the Fixing Film Unit ......................................................................................................... 8-15
8.4.4 Fixing Delivery Sensor.............................................................................................................................. 8-17
8.4.4.1 Removing the Drum Unit ................................................................................................................... 8-17
8.4.4.2 Removing the Rear Cover .................................................................................................................. 8-17
8.4.4.3 Removing the Left Cover (Rear)........................................................................................................ 8-17
8.4.4.4 Removing the Left Door..................................................................................................................... 8-17
8.4.4.5 Removing the Fixing Unit .................................................................................................................. 8-18
8.4.4.6 Removing the Fixing Delivery Sensor ............................................................................................... 8-18
8.4.5 Fixing Film Sensor .................................................................................................................................... 8-19
Contents