Canon ImageRunner iR8500 Series Service Manual page 651

Contents
14.1 Image Adjustment Basic Procedure ...........................................................................................................................14-1
14.1.1 Making Pre-Checks.................................................................................................................................................................. 14-1
14.1.2 Making Pre-Checks.................................................................................................................................................................. 14-1
14.1.3 Making Checks on the Printer Side (Checking the Images) .................................................................................................... 14-2
14.1.4 Making Checks on the Printer Side (Checking the Density Slope) ......................................................................................... 14-2
14.1.5 Making Checks on the Printer Side (Checking the Solid Black Density) ............................................................................... 14-3
14.1.6 Making Checks on the Printer Side (Checking for fogging) ................................................................................................... 14-4
14.1.7 Making Checks on the Printer Side (Checking Halftone Density) .......................................................................................... 14-5
14.1.8 Making Checks on the Scanner Side (Initial Checks) ............................................................................................................. 14-6
14.1.9 Making Checks on the Scanner Side (Checking the Density Slope) ....................................................................................... 14-6
14.1.10 Making Checks on the Scanner Side (Checking the Density Slope) ..................................................................................... 14-7
14.1.11 Making Checks on the Scanner Side (Checking for fogging) ............................................................................................... 14-7
14.1.12 Making Checks on the Scanner Side(Checking Halftone Density) ....................................................................................... 14-8
14.1.13 Making Checks on the Scanner Side(Initial Checks) ............................................................................................................ 14-9
14.1.14 Making Checks on the Scanner Side(Checking the Density Slope) ...................................................................................... 14-9
14.1.15 Making Checks on the Scanner Side(Checking the Solid Black).......................................................................................... 14-9
14.1.16 Making Checks on the Scanner Side(Checking for fogging) .............................................................................................. 14-10
14.1.17 Making Checks on the Scanner Side(Checking Halftone Density) ..................................................................................... 14-11
14.1.18 Potential Control System Conversion Table........................................................................................................................ 14-12
14.2 Image Adjustments ..................................................................................................................................................14-15
14.2.1 Overview................................................................................................................................................................................ 14-15
14.2.2 Outline.................................................................................................................................................................................... 14-15
14.2.3 Conversion Table for the Potential Control System .............................................................................................................. 14-15
14.2.4 Adjusting the Image Position for Printer Output ................................................................................................................... 14-18
14.2.5 Adjusting the Image Position for Printer Output ................................................................................................................... 14-19
14.2.6 Adjusting the Image Position of Copier Output (book mode) ............................................................................................... 14-21
14.2.7 Adjusting the Image Position for Copier Output (book mode).............................................................................................. 14-22
14.2.8 Adjusting the Image Position of Copier Output (ADF mode) ............................................................................................... 14-23
14.2.9 Adjusting the Image Position for Copier Output (ADF mode).............................................................................................. 14-23
14.3 Scanning System ......................................................................................................................................................14-25
14.3.1 When Replacing the CCD Unit.............................................................................................................................................. 14-25
14.3.2 Points to Note when Replacing the CCD Unit....................................................................................................................... 14-25
14.3.3 Points to Note when Replacing the CCD Unit....................................................................................................................... 14-25
14.3.4 When Replacing the Standard White Plate ............................................................................................................................ 14-26
14.3.5 When Replacing the Standard White Plate ............................................................................................................................ 14-26
14.3.6 When Replacing the Scanning Lamp..................................................................................................................................... 14-26
14.3.7 When Replacing the Scanning Lamp..................................................................................................................................... 14-26
14.3.8 After Replacing the Scanning Lamp...................................................................................................................................... 14-26
14.3.9 Points to Note When Replacing the reader controller PCB ................................................................................................... 14-27
14.3.10 When Replacing the Reader Controller PCB....................................................................................................................... 14-27
14.3.11 When Replacing the Reder controller PCB ......................................................................................................................... 14-27
14.4 Laser Exposure System ............................................................................................................................................14-28
14.4.1 Points to Note When Replacing the Laser Unit ..................................................................................................................... 14-28
14.4.2 When Replacing the Laser Unit ............................................................................................................................................. 14-28
14.4.3 Checking the Laser Power ..................................................................................................................................................... 14-28
14.4.4 Checking the Laser Power ..................................................................................................................................................... 14-29
14.4.5 Checking the Laser Power ..................................................................................................................................................... 14-29
14.5 Image Formation System .........................................................................................................................................14-31
14.5.1 Adjusting the Height of the Charging Wire ........................................................................................................................... 14-31
14.6 Fixing System ..........................................................................................................................................................14-32
Contents