Canon ImageRunner iR8500 Series Service Manual page 12

Contents
4.7.5.9 When Replacing the HDD...................................................................................................................................................... 4- 33
4.7.6 Controller Fan ........................................................................................................................................................4- 33
4.7.6.1 Removing the Rear Cover ..................................................................................................................................................... 4- 33
4.7.6.2 Removing the Rear Cover ..................................................................................................................................................... 4- 34
4.7.6.3 Removing the Rear Cover ..................................................................................................................................................... 4- 34
4.7.6.4 Removing the System Connector Cover................................................................................................................................ 4- 34
4.7.6.5 Removing the Main Controller Box Cover.............................................................................................................................. 4- 34
4.7.6.6 Removing the Controller Fan ................................................................................................................................................. 4- 34
Chapter 5 Original Exposure System
5.1 Construction ............................................................................................................................................... 5- 1
5.1.1 Outline of the Original Exposure System(iR105) .....................................................................................................5- 1
5.1.2 Outline......................................................................................................................................................................5- 1
5.1.3 Major Components...................................................................................................................................................5- 2
5.1.4 Arrangement of PCBs ..............................................................................................................................................5- 3
5.1.5 Outline......................................................................................................................................................................5- 3
5.1.6 Major Components...................................................................................................................................................5- 4
5.1.7 Arrangement of PCBs ..............................................................................................................................................5- 5
5.2 Basic Sequence ......................................................................................................................................... 5- 7
5.2.1 Basic Sequence of Operations ................................................................................................................................5- 7
5.2.2 Book Mode, 1 Original, Copyboard Closed..............................................................................................................5- 7
5.2.3 Book Mode, 1 Original, Copyboard Cover Open .....................................................................................................5- 8
5.3 Various Control......................................................................................................................................... 5- 10
5.3.1 Controlling the Scanner Drive System ...................................................................................................................5- 10
5.3.1.1 Outline.................................................................................................................................................................................... 5- 10
5.3.1.2 Controlling the Scanner Motor ............................................................................................................................................... 5- 10
5.3.1.3 Preventing Overheating of the Scanner Motor....................................................................................................................... 5- 12
5.3.1.4 Outline.................................................................................................................................................................................... 5- 13
5.3.1.5 Controlling the Scanner Motor ............................................................................................................................................... 5- 13
5.3.2 Enlargement/Reduction .........................................................................................................................................5- 14
5.3.2.1 Changing the Reproduction Ratio in Main Scanning Direction .............................................................................................. 5- 14
5.3.2.2 Enlargement/Reduction(iR105).............................................................................................................................................. 5- 14
5.3.2.3 Changing the Reproduction Ratio in Sub Scanning Direction ............................................................................................... 5- 15
5.3.2.4 Changing the Reproduction Ratio in Main Scanning Direction .............................................................................................. 5- 15
5.3.2.5 Changing the Reproduction Ratio in Sub Scanning Direction ............................................................................................... 5- 15
5.3.3 Controlling the Scanning Lamp..............................................................................................................................5- 15
5.3.3.1 Outline.................................................................................................................................................................................... 5- 15
5.3.3.2 Stabilizing the Scanning Lamp(iR105)................................................................................................................................... 5- 16
5.3.3.3 Controlling the Temperature by a Fluorescent Lamp Heater................................................................................................. 5- 16
5.3.3.4 Controlling Pre-Heat Voltage ................................................................................................................................................. 5- 17
5.3.3.5 Initial Activation ...................................................................................................................................................................... 5- 17
5.3.3.6 Detecting an Error.................................................................................................................................................................. 5- 18
5.3.3.7 Outline.................................................................................................................................................................................... 5- 19
5.3.3.8 Scanning Lamp ...................................................................................................................................................................... 5- 19
5.3.3.9 Turning On/Off the Lamp ....................................................................................................................................................... 5- 19
5.3.3.10 Detecting an Error ................................................................................................................................................................ 5- 19
5.3.4 Detecting the Size of Originals...............................................................................................................................5- 20
5.3.4.1 Outline.................................................................................................................................................................................... 5- 20
5.3.4.2 Detecting the State (open/closed) of the ADF ....................................................................................................................... 5- 20
5.3.4.3 Outline.................................................................................................................................................................................... 5- 21
5.3.4.4 Points of Detection................................................................................................................................................................. 5- 21
5.3.4.5 Outline of Detection ............................................................................................................................................................... 5- 22
5.3.4.6 Book Mode, 1 Original, Copyboard Cover Open ................................................................................................................... 5- 22
5.3.4.7 Book Mode, 1 Original, Copyboard Cover Close ................................................................................................................... 5- 23
5.3.5 Dirt Sensor Control ................................................................................................................................................5- 25
5.3.5.1 Detecting Dust in Stream Reading......................................................................................................................................... 5- 25
5.4 Parts Replacement Procedure ................................................................................................................. 5- 27
5.4.1 Reader Unit............................................................................................................................................................5- 27