Canon iR4570 Series Service Manual page 467

Contents
9.1 Construction ....................................................................................................................................................... 9-1
9.1.1 Specifications, Control Mechanisms, and Functions .................................................................................. 9-1
9.1.2 Major Components ...................................................................................................................................... 9-1
9.2 Basic Sequence................................................................................................................................................... 9-3
9.2.1 Power-On Sequence .................................................................................................................................... 9-3
9.2.2 Down Sequence ........................................................................................................................................... 9-3
9.3 Various Control Mechanisms............................................................................................................................. 9-4
9.3.1 Controlling the Speed of the Fixing Film ................................................................................................... 9-4
9.3.1.1 Controlling the Fixing Film Speed in Response to Low Temperature................................................. 9-4
9.3.1.2 Controlling the Fixing Film Speed ....................................................................................................... 9-4
9.3.2 Controlling the Fixing Film Temperature ................................................................................................... 9-5
9.3.2.1 Controlling the Power Supply in Response to Low Temperature........................................................ 9-5
9.3.2.2 Controlling the Feeding in Response to Low Temperature.................................................................. 9-5
9.3.2.3 Controlling the Power Supply at Start-Up............................................................................................ 9-5
9.3.2.4 Copying Temperature Control.............................................................................................................. 9-6
9.3.2.5 Changing the Fixing Film Control Temperature .................................................................................. 9-6
9.3.2.6 Temperature Control in Response to Automatic Double-Sided Copy ................................................. 9-6
9.3.2.7 Temperature Control in Response to Change of Paper Size ................................................................ 9-7
9.3.3 Cleaning....................................................................................................................................................... 9-7
9.3.3.1 Fixing Film Cleaning............................................................................................................................ 9-7
9.3.4 Detecting the Passage of Paper ................................................................................................................... 9-8
9.3.4.1 Detecting the Passage of Paper............................................................................................................. 9-8
9.4 Protective Functions ........................................................................................................................................... 9-9
9.4.1 Protective Functions .................................................................................................................................... 9-9
9.4.2 Detecting an Error ..................................................................................................................................... 9-10
9.5 Parts Replacement Procedure........................................................................................................................... 9-12
9.5.1 Fixing Unit ................................................................................................................................................ 9-12
9.5.1.1 Removing the Right Cover (rear) ....................................................................................................... 9-12
9.5.1.2 Removing the Right Door .................................................................................................................. 9-12
9.5.1.3 Removing the Right Door .................................................................................................................. 9-14
9.5.1.4 Removing the Fixing Unit .................................................................................................................. 9-16
9.5.2 Pressure Roller .......................................................................................................................................... 9-18
9.5.2.1 Removing the Inside Delivery Cover Unit......................................................................................... 9-18
9.5.2.2 Removing the Grounding Plate .......................................................................................................... 9-19
9.5.2.3 Removing the Fixing Film Cover....................................................................................................... 9-20
9.5.2.4 Removing the Left Side Plate............................................................................................................. 9-21
9.5.2.5 Releasing the Locking Plate ............................................................................................................... 9-22
9.5.2.6 Removing the Fixing Film Unit ......................................................................................................... 9-24
9.5.2.7 Removing the Inlet Guide .................................................................................................................. 9-26
9.5.2.8 Removing the Pressure Roller ............................................................................................................ 9-26
9.5.3 Cleaning Roller.......................................................................................................................................... 9-28
9.5.3.1 Removing the Inside Delivery Cover Unit......................................................................................... 9-28
9.5.3.2 Removing the Cleaning Roller ........................................................................................................... 9-29
9.5.4 Fixing Film ................................................................................................................................................ 9-30
Contents