Canon iR2020 Series Service Manual page 221

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
8.4.5.1 Removing the Drum Unit..............................................................................................................................................................................8-19
8.4.5.2 Removing the Rear Cover .............................................................................................................................................................................8-19
8.4.5.3 Removing the Left Cover (Rear)...................................................................................................................................................................8-20
8.4.5.4 Removing the Left Door ...............................................................................................................................................................................8-20
8.4.5.5 Removing the Fixing Unit.............................................................................................................................................................................8-20
8.4.5.6 Removing the Fixing Film Sensor ................................................................................................................................................................8-21
Contents