Canon iR7086 Series Service Manual page 355

Contents
9.1 Construction ...................................................................................................................................................................9-1
9.1.1 Outline.......................................................................................................................................................................................... 9-1
9.1.2 Major Components....................................................................................................................................................................... 9-1
9.1.3 Overview of the Fixing Drive System ......................................................................................................................................... 9-2
9.1.4 Controlling the Fixing Roller Drive............................................................................................................................................. 9-3
9.1.5 Controlling the Cleaning Web Drive ........................................................................................................................................... 9-3
9.1.6 Controlling the Thermistor Reciprocating Mechanism ............................................................................................................... 9-4
9.1.7 Controlling the Upper Separation Claw Reciprocating Mechanism............................................................................................ 9-4
9.1.8 Controlling the Fixing Inlet Sensor Drive ................................................................................................................................... 9-5
9.2 Basic Sequence ..............................................................................................................................................................9-6
9.2.1 Basic Sequence of Operations ..................................................................................................................................................... 9-6
9.3 Various Control Mechanisms.........................................................................................................................................9-6
9.3.1 Controlling the Fixing Roller Temperature ................................................................................................................................. 9-6
9.3.1.1 Controlling the Down Sequence .....................................................................................................................................................................9-6
9.3.1.2 Transparency Mode.........................................................................................................................................................................................9-7
9.3.1.3 Heavy Paper Mode ..........................................................................................................................................................................................9-8
9.3.1.4 Power Save Mode ...........................................................................................................................................................................................9-8
9.4 Protective Functions.......................................................................................................................................................9-9
9.4.1 Error Detection............................................................................................................................................................................. 9-9
9.5 Parts Replacement Procedure.......................................................................................................................................9-11
9.5.1 Fixing Unit ................................................................................................................................................................................. 9-11
9.5.1.1 Removing the Fixing Assembly....................................................................................................................................................................9-11
9.5.2 Upper Fixing Roller ................................................................................................................................................................... 9-12
9.5.2.1 Removing the Fixing Upper Roller...............................................................................................................................................................9-12
9.5.2.2 Mounting the Fixing Upper Roller................................................................................................................................................................9-13
9.5.3 Lower Fixing Roller................................................................................................................................................................... 9-13
9.5.3.1 Removing the Lower Fixing Roller ..............................................................................................................................................................9-13
9.5.3.2 Adjusting the Lower Roller Pressure (nip) ...................................................................................................................................................9-13
9.5.4 External Delivery Roller ............................................................................................................................................................ 9-14
9.5.4.1 Removing the External Delivery Roller........................................................................................................................................................9-14
9.5.5 Internal Delivery Roller ............................................................................................................................................................. 9-14
9.5.5.1 Removing the Internal Delivery Roller.........................................................................................................................................................9-14
9.5.6 Main Thermistor ........................................................................................................................................................................ 9-14
9.5.6.1 Removing the Main Thermistor ....................................................................................................................................................................9-14
9.5.6.2 Mounting the Main Thermistor .....................................................................................................................................................................9-15
9.5.7 Sub Thermistor........................................................................................................................................................................... 9-15
9.5.7.1 Removing the Sub Thermistor ......................................................................................................................................................................9-15
9.5.8 Thermal Switch .......................................................................................................................................................................... 9-15
9.5.8.1 Removing the Thermal Switch Unit .............................................................................................................................................................9-15
9.5.8.2 Mounting the Thermal Switch Unit ..............................................................................................................................................................9-16
9.5.9 Fixing Heater ............................................................................................................................................................................. 9-16
9.5.9.1 Removing the Main/Sub Heater....................................................................................................................................................................9-16
9.5.9.2 Mounting the Main/Sub Heater.....................................................................................................................................................................9-16
9.5.9.3 Points to Note When Mounting the Fixing Heater........................................................................................................................................9-16
9.5.10 Fixing Cleaning Belt ................................................................................................................................................................ 9-17
9.5.10.1 Removing the Fixing Cleaning Belt............................................................................................................................................................9-17
9.5.10.2 Mounting the Fixing Cleaning Belt.............................................................................................................................................................9-17
9.5.11 Claw Jam Sensor...................................................................................................................................................................... 9-18
9.5.11.1 Removing the Claw Jam Sensor .................................................................................................................................................................9-18
9.5.12 External Delivery Sensor ......................................................................................................................................................... 9-18
9.5.12.1 Remove the External Delivery Sensor ........................................................................................................................................................9-18
9.5.13 Internal Delivery Sensor .......................................................................................................................................................... 9-18
Contents