Canon iR C3200 Series Service Manual page 24

Contents
11.3 Various Control Mechanisms ........................................................................................................................ 11-7
11.3.1 Controlling the Speed of the Fixing Roller ............................................................................................. 11-7
11.3.1.1 Outline ............................................................................................................................................. 11-7
11.3.1.2 Controlling the Speed According to the Type of Paper ................................................................... 11-7
11.3.1.3 Controlling the Speed According to the Quantity of Printing ......................................................... 11-8
11.3.1.4 Preventing Partial Deformation of the Roller .................................................................................. 11-8
11.3.2 Controlling the Fixing Roller Temperature ............................................................................................. 11-8
11.3.2.1 Outline ............................................................................................................................................. 11-8
11.3.2.2 At Power-On .................................................................................................................................. 11-10
11.3.2.3 In Standby ...................................................................................................................................... 11-10
11.3.2.4 During Printing .............................................................................................................................. 11-11
11.3.2.5 Between Sheets .............................................................................................................................. 11-12
11.3.2.6 Overheating in Areas Without Paper ............................................................................................. 11-13
11.3.2.7 Return for Low-Power Mode ......................................................................................................... 11-13
11.3.3 Detecting the Passage of Paper ............................................................................................................. 11-14
11.3.3.1 Detecting the Passage of Paper ...................................................................................................... 11-14
11.4 Protective Functions .................................................................................................................................... 11-15
11.4.1 Turning Off the Power Against Overheating (in response to activation of thermal switch) ................ 11-15
11.4.2 Detecting Overheating by the Thermistors ........................................................................................... 11-16
11.5 Parts Replacement Procedure ...................................................................................................................... 11-17
11.5.1 Fixing Unit ............................................................................................................................................ 11-17
11.5.1.1 Removing the Fixing Unit ............................................................................................................. 11-17
11.5.1.2 After Disassembling the Fixing Unit ............................................................................................. 11-17
11.5.2 Fixing Upper Frame .............................................................................................................................. 11-18
11.5.2.1 Removing the Fixing Unit ............................................................................................................. 11-18
11.5.2.2 Removing the Delivery Upper Guide ............................................................................................ 11-18
11.5.2.3 Removing the Fixing Upper Frame ............................................................................................... 11-19
11.5.2.4 After Disassembling the Fixing Unit ............................................................................................. 11-20
11.5.3 Fixing Roller ......................................................................................................................................... 11-21
11.5.3.1 Removing the Fixing Unit ............................................................................................................. 11-21
11.5.3.2 Removing the Delivery Upper Guide ............................................................................................ 11-21
11.5.3.3 Removing the Fixing Upper Frame ............................................................................................... 11-22
11.5.3.4 Remove the Fixing Main Heater and the Fixing Sub Heater ......................................................... 11-23
11.5.3.5 Removing the Fixing Roller .......................................................................................................... 11-24
11.5.3.6 After Disassembling the Fixing Unit ............................................................................................. 11-25
11.5.4 Pressure Roller ...................................................................................................................................... 11-26
11.5.4.1 Removing the Fixing Unit ............................................................................................................. 11-26
11.5.4.2 Removing the Delivery Upper Guide ............................................................................................ 11-26
11.5.4.3 Removing the Fixing Upper Frame ............................................................................................... 11-27
11.5.4.4 Removing the Fixing Temperature Retainer Heater ...................................................................... 11-28
11.5.4.5 Removing the Pressure Roller ....................................................................................................... 11-29
11.5.4.6 After Disassembling the Fixing Unit ............................................................................................. 11-29
11.5.5 Fixing Main Thermistor ........................................................................................................................ 11-30
11.5.5.1 Removing the Fixing Unit ............................................................................................................. 11-30
11.5.5.2 Removing the Delivery Upper Guide ............................................................................................ 11-30
11.5.5.3 Removing the Fixing Upper Frame ............................................................................................... 11-31
11.5.5.4 Removing the Fixing Main Thermistor ......................................................................................... 11-32
11.5.5.5 After Disassembling the Fixing Unit ............................................................................................. 11-33
11.5.6 Fixing Sub Thermistor .......................................................................................................................... 11-34
11.5.6.1 Removing the Fixing Unit ............................................................................................................. 11-34
11.5.6.2 Removing the Delivery Upper Guide ............................................................................................ 11-34
11.5.6.3 Removing the Fixing Upper Frame ............................................................................................... 11-35
11.5.6.4 Removing the Fixing Sub thermistor ............................................................................................. 11-36
11.5.6.5 After Disassembling the Fixing Unit ............................................................................................. 11-36