Canon iR C3200 Series Service Manual page 11

Chapter 6 Original Exposure System
6.1 Construction ...................................................................................................................................................... 6-1
6.1.1 Specifications, Control Mechanisms, and Functions ................................................................................. 6-1
6.1.2 Major Components ..................................................................................................................................... 6-1
6.1.3 Construction of the Control System ........................................................................................................... 6-4
6.1.4 Reader Controller PCB ............................................................................................................................... 6-4
6.2 Basic Sequence .................................................................................................................................................. 6-5
6.2.1 Basic Sequence of Operations at Power-On ............................................................................................... 6-5
6.2.2 Basic Sequence of Operations in Response to a Press on the Start Key (book mode, 1 original) ............. 6-6
6.3 Various Control Mechanisms ............................................................................................................................ 6-7
6.3.1 Controlling the Scanner Drive System ....................................................................................................... 6-7
6.3.1.1 Outline ................................................................................................................................................. 6-7
6.3.1.2 Controlling the Scanner Motor ............................................................................................................ 6-8
6.3.2 Enlargement/Reduction ............................................................................................................................... 6-9
6.3.2.1 Changing the Reproduction Ratio ....................................................................................................... 6-9
6.3.2.2 Changing the Reproduction Ratio in Main Scanning Direction .......................................................... 6-9
6.3.2.3 Changing the Reproduction Ratio in Sub Scanning Direction ............................................................ 6-9
6.3.3 Controlling the Scanning Lamp .................................................................................................................. 6-9
6.3.3.1 Outline ................................................................................................................................................. 6-9
6.3.3.2 Scanning Lamp .................................................................................................................................. 6-10
6.3.3.3 Turning On/Off the Lamp ................................................................................................................. 6-10
6.3.3.4 Checking for an Error ........................................................................................................................ 6-10
6.3.4 Detecting the Size of Originals ................................................................................................................. 6-10
6.3.4.1 Outline ............................................................................................................................................... 6-10
6.3.4.2 Points of Detection (original size) ..................................................................................................... 6-11
6.3.4.3 Outline of Detection Operations ........................................................................................................ 6-11
6.4 Parts Replacement Procedure .......................................................................................................................... 6-14
6.4.1 Copyboard Glass ....................................................................................................................................... 6-14
6.4.1.1 Removing the Copyboard Glass ........................................................................................................ 6-14
6.4.1.2 After Replacing the Copyboard Glass ............................................................................................... 6-14
6.4.2 Exposure Lamp ......................................................................................................................................... 6-15
6.4.2.1 Removing the Copyboard Glass ........................................................................................................ 6-15
6.4.2.2 Removing the Reader Left Cover/Reader Right Cover/Reader Front Cover .................................... 6-15
6.4.2.3 Removing the CCD Unit Cover ........................................................................................................ 6-15
6.4.2.4 Removing the Scanning Lamp .......................................................................................................... 6-16
6.4.3 Reader Controller PCB ............................................................................................................................. 6-17
6.4.3.1 Removing the Copyboard Glass ........................................................................................................ 6-17
6.4.3.2 Removing the CCD Unit Cover ........................................................................................................ 6-17
6.4.3.3 Removing the Original Size Detection Unit ...................................................................................... 6-18
6.4.3.4 Removing the Reader Controller PCB .............................................................................................. 6-18
6.4.3.5 When Replacing the Reader Controller PCB .................................................................................... 6-18
6.4.4 Interface PCB ............................................................................................................................................ 6-19
6.4.4.1 Removing the Copyboard Glass ........................................................................................................ 6-19
6.4.4.2 Removing the Reader Rear Cover ..................................................................................................... 6-20
6.4.4.3 Removing the Interface PCB ............................................................................................................. 6-20
6.4.5 Inverter PCB ............................................................................................................................................. 6-21
6.4.5.1 Removing the Copyboard Glass ........................................................................................................ 6-21
6.4.5.2 Removing the CCD Unit Cover ........................................................................................................ 6-22
6.4.5.3 Removing the Inverter PCB .............................................................................................................. 6-22
6.4.6 CCD Unit .................................................................................................................................................. 6-22
6.4.6.1 Removing the Copyboard Glass ........................................................................................................ 6-22
6.4.6.2 Removing the CCD Unit Cover ........................................................................................................ 6-23
6.4.6.3 Removing the Original Size Detection Unit ...................................................................................... 6-23
6.4.6.4 Removing the CCD Unit ................................................................................................................... 6-24
Contents