Canon iR C3200 Series, Service Manual, Page: 577 / 1216

Contents
Contents
11.1 Construction .................................................................................................................................................. 11-1
11.1.1 Specifications, Control Mechanisms, and Functions ............................................................................. 11-1
11.1.2 Major Components ................................................................................................................................. 11-1
11.1.3 Construction of the Control System ....................................................................................................... 11-3
11.2 Basic Sequence .............................................................................................................................................. 11-4
11.2.1 Sequence of Operations at Power-On .................................................................................................... 11-4
11.2.2 Sequence of Operations (printing; plain paper, for less than 180 sec) ................................................... 11-5
11.2.3 Basic Sequence of Operations (during printing; plain paper, for 180 sec or more) ............................... 11-6
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