Canon iR6570 series Service Manual page 353

Contents
9.1 Construction ...................................................................................................................................................................9-1
9.1.1 Specifications, Control Mechanisms, and Functions ................................................................................................................... 9-1
9.1.2 Major Components....................................................................................................................................................................... 9-1
9.1.3 IH Fixing Method (outline).......................................................................................................................................................... 9-3
9.1.4 Limiting th Rise in Temperature at the Roller Edges by Use of a Flux blocking Plate (shutter) ................................................ 9-4
9.2 Basic Sequence ..............................................................................................................................................................9-5
9.2.1 Outline.......................................................................................................................................................................................... 9-5
9.2.2 30-Sec Start-Up Mode ................................................................................................................................................................. 9-5
9.2.3 Low-Temperature Environment Start-Up Mode ......................................................................................................................... 9-6
9.2.4 High-Humidity Environment Start-Up Mode .............................................................................................................................. 9-6
9.2.5 Recovery Mode ............................................................................................................................................................................ 9-7
9.2.6 Standby Mode .............................................................................................................................................................................. 9-7
9.2.7 Power Save Mode ........................................................................................................................................................................ 9-8
9.2.8 Sleep Mode ................................................................................................................................................................................. 9-8
9.2.9 Copying/Printing Mode ............................................................................................................................................................... 9-9
9.2.10 Down Sequence ......................................................................................................................................................................... 9-9
9.2.11 Enhanced Fixing Mode .............................................................................................................................................................. 9-9
9.2.12 Heavy Paper Mode................................................................................................................................................................... 9-10
9.2.13 Transparency Mode ................................................................................................................................................................. 9-10
9.2.14 Bond Paper Mode .................................................................................................................................................................... 9-11
9.3 Various Control Mechanisms.......................................................................................................................................9-12
9.3.1 Fixing Drive System .................................................................................................................................................................. 9-12
9.3.1.1 Controlling the Drive of the Fixing Roller....................................................................................................................................................9-12
9.3.1.2 Controlling the Drive of the Fixing Inlet Guide............................................................................................................................................9-12
9.3.1.3 Controlling the Reciprocating Movement of the Thermistor........................................................................................................................9-13
9.3.1.4 Controlling the Reciprocating Mechanism of the Upper Separation Claw...................................................................................................9-14
9.3.1.5 Controlling the Drive of the Shutter..............................................................................................................................................................9-15
9.3.1.6 Controlling the Shutter Position....................................................................................................................................................................9-15
9.3.2 Cleaning ..................................................................................................................................................................................... 9-18
9.3.2.1 Controlling the Drive of the Cleaning Web ..................................................................................................................................................9-18
9.3.2.2 Controlling the Mechanism Used to Detect the Remaining Length of the Cleaning Web ...........................................................................9-19
9.3.3 Detecting the Passage of Paper .................................................................................................................................................. 9-20
9.3.3.1 Preventing Wrapping of Paper ......................................................................................................................................................................9-20
9.4 Protective Functions.....................................................................................................................................................9-21
9.4.1 Detecting an Error Using the Thermistor................................................................................................................................... 9-21
9.4.2 Detecting an Error Using the Thermal Switch........................................................................................................................... 9-21
9.4.3 Errors.......................................................................................................................................................................................... 9-21
9.5 Parts Replacement Procedure.......................................................................................................................................9-22
9.5.1 Fixing/Feeding Assembly .......................................................................................................................................................... 9-22
9.5.1.1 Removing the Fixing Feed Unit....................................................................................................................................................................9-22
9.5.2 Fixing Unit ................................................................................................................................................................................. 9-23
9.5.2.1 Removing the Fixing Upper Unit..................................................................................................................................................................9-23
9.5.3 Pressure Roller ........................................................................................................................................................................... 9-26
9.5.3.1 Removing the Pressure Roller.......................................................................................................................................................................9-26
9.5.4 Upper Fixing Roller ................................................................................................................................................................... 9-27
9.5.4.1 Removing the Fixing Roller..........................................................................................................................................................................9-27
9.5.4.2 Points to Note When Mounting the Fixing Roller ........................................................................................................................................9-29
9.5.4.3 Applying Grease After Replacing the Fixing Roller.....................................................................................................................................9-31
9.5.4.4 Adjusting the Nip Width ...............................................................................................................................................................................9-31
9.5.5 External Delivery Roller ............................................................................................................................................................ 9-31
9.5.5.1 Removing the Outside Delivery Roller.........................................................................................................................................................9-31
Contents