Canon ImageRunner iR8500 Series, Service Manual, Page: 249 / 1122

Contents
Contents
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
5.4.1.1 Removing the Reader Unit............................................................................................................................................................................5-27
5.4.1.2 Sliding the Reader Unit.................................................................................................................................................................................5-27
5.4.2 CCD Unit ................................................................................................................................................................................... 5-27
5.4.2.1 Removing the CCD Unit...............................................................................................................................................................................5-27
5.4.2.2 Removing the CCD Unit...............................................................................................................................................................................5-28