4.4.8 Reader Heater (option).......................................................................................................................... 4- 24

4.4.8.1 Removing the Copyboard glass ................................................................................................... 4- 24

4.4.8.2 Removing the Reader Heater (Right) .......................................................................................... 4- 25

4.4.8.3 Removing the Reader Front Cover .............................................................................................. 4- 25

4.4.8.4 Removing the ADF Reading Glass .............................................................................................. 4- 25

4.4.8.5 Removing the Reader Heater (Left)............................................................................................. 4- 26

Chapter 5 Laser Exposure

5.1 Construction..................................................................................................................................................... 5- 1

5.1.1 Overview ................................................................................................................................................... 5- 1

5.1.2 Specifications and Control Mechanism ................................................................................................ 5- 1

5.1.3 Specifications and Control Mechanism ................................................................................................ 5- 1

5.1.4 Main Components.................................................................................................................................... 5- 1

5.1.5 Control System Configuration................................................................................................................ 5- 2

5.2 Various Controls ............................................................................................................................................. 5- 3

5.2.1 Controlling the Laser Activation Timing ................................................................................................ 5- 3

5.2.1.1 Laser Emission ON/OFF Control ................................................................................................... 5- 3

5.2.1.2 Laser Emission ON/OFF Control ................................................................................................... 5- 3

5.2.1.3 Horizontal Synchronization Control ............................................................................................... 5- 4

5.2.1.4 Horizontal Synchronization Control ............................................................................................... 5- 4

5.2.2 Controlling the Intensity of Laser Light ................................................................................................. 5- 4

5.2.2.1 Automatic Photocurrent Control (APC) ......................................................................................... 5- 4

5.2.3 Controlling the Laser Scanner Motor .................................................................................................... 5- 4

5.2.3.1 Laser Scanner Motor Control.......................................................................................................... 5- 4

5.2.4 Controlling the Laser Shutter.................................................................................................................. 5- 5

5.2.4.1 Laser Shutter Control ....................................................................................................................... 5- 5

5.3 Parts Replacement Procedure ..................................................................................................................... 5- 7

5.3.1 Laser Scanner Unit .................................................................................................................................. 5- 7

5.3.1.1 Removing the Rear Cover............................................................................................................... 5- 7

5.3.1.2 Removing the Right Cover (Lower) ............................................................................................... 5- 7

5.3.1.3 Removing the Delivery Tray............................................................................................................ 5- 7

5.3.1.4 Removing the Laser Scanner Unit ................................................................................................. 5- 7

Chapter 6 Image Formation

6.1 Construction..................................................................................................................................................... 6- 1

6.1.1 Specifications of Image Formation System ......................................................................................... 6- 1

6.1.2 Major Components of Image Formation System ................................................................................ 6- 1

6.2 Image Formation Process ............................................................................................................................. 6- 1

6.2.1 Image Formation Process ...................................................................................................................... 6- 1

6.3 Basic Sequence .............................................................................................................................................. 6- 2

6.3.1 Basic Sequence of Operation ................................................................................................................ 6- 2

6.4 Driving and Controlling the High-Voltage System ..................................................................................... 6- 3

6.4.1 Outline ....................................................................................................................................................... 6- 3

6.5 Drum Unit ......................................................................................................................................................... 6- 4

6.5.1 Outline of the Drum Unit.......................................................................................................................... 6- 4

6.5.1.1 Outline ................................................................................................................................................ 6- 4

Contents

Table of Contents