Service manual

Contents
Contents
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
6.5.2 Charging Mechanism .................................................................................................................................. 6-4
6.5.2.1 Primary Charging Bias Control............................................................................................................ 6-4
6.6 Developing Unit ................................................................................................................................................. 6-5
6.6.1 Outline......................................................................................................................................................... 6-5
6.6.2 Developing Bias Control............................................................................................................................. 6-5
6.7 Toner Container.................................................................................................................................................. 6-6
6.7.1 Outline......................................................................................................................................................... 6-6
6.8 Transfer Unit ...................................................................................................................................................... 6-6
6.8.1 Outline of the Transfer Unit ........................................................................................................................ 6-6
6.8.1.1 Outline .................................................................................................................................................. 6-6
6.8.2 Controlling the Transfer Bias...................................................................................................................... 6-7
6.8.2.1 Transfer Roller Bias Control ................................................................................................................ 6-7
6.8.3 Separation Mechanism ................................................................................................................................ 6-7
6.8.3.1 Static Eliminator Bias Control.............................................................................................................. 6-7
6.9 Photosensitive Drum Cleaning........................................................................................................................... 6-8
6.9.1 Outline......................................................................................................................................................... 6-8
6.9.2 Waste Toner Full Detection ........................................................................................................................ 6-8
6.10 Parts Replacement Procedure........................................................................................................................... 6-9
6.10.1 Drum Unit.................................................................................................................................................. 6-9
6.10.1.1 Removing the Drum Unit ................................................................................................................... 6-9
6.10.2 Developing Assembly ............................................................................................................................... 6-9
6.10.2.1 Removing the Drum Unit ................................................................................................................... 6-9
6.10.2.2 Removing the Rear Cover .................................................................................................................. 6-9
6.10.2.3 Removing the Right Cover (Lower)................................................................................................... 6-9
6.10.2.4 Removing the Delivery Tray.............................................................................................................. 6-9
6.10.2.5 Removing the Developing Assembly................................................................................................. 6-9
6.10.2.6 Precautions about Installation of Developing Assembly .................................................................6-10
6.10.2.7 Procedure after Replacing the Developing Assembly......................................................................6-10
6.10.3 Transfer Charging Roller......................................................................................................................... 6-10
6.10.3.1 Removing the Transfer Charging Roller .......................................................................................... 6-10