ContentsContents6.1 Construction ...................................................................................................................................................................6-16.1.1 Specifications of Image Formation System ................................................................................................................................. 6-16.1.2 Major Components of Image Formation System......................................................................................................................... 6-16.2 Image Formation Process...............................................................................................................................................6-36.2.1 Image Formation Process............................................................................................................................................................. 6-36.3 Basic Sequence ..............................................................................................................................................................6-36.3.1 Basic Sequence of Operation ....................................................................................................................................................... 6-36.4 Driving and Controlling the High-Voltage System .......................................................................................................6-56.4.1 Outline.......................................................................................................................................................................................... 6-56.5 Drum Unit ......................................................................................................................................................................6-56.5.1 Outline of the Drum Unit ............................................................................................................................................................. 6-56.5.1.1 Outline.............................................................................................................................................................................................................6-56.5.2 Charging Mechanism ................................................................................................................................................................... 6-56.5.2.1 Primary Charging Bias Control.......................................................................................................................................................................6-56.6 Developing Unit.............................................................................................................................................................6-66.6.1 Outline.......................................................................................................................................................................................... 6-66.6.2 Developing Bias Control.............................................................................................................................................................. 6-66.7 Toner Container .............................................................................................................................................................6-76.7.1 Outline.......................................................................................................................................................................................... 6-76.8 Transfer Unit ..................................................................................................................................................................6-76.8.1 Outline of the Transfer Unit......................................................................................................................................................... 6-76.8.1.1 Outline.............................................................................................................................................................................................................6-76.8.2 Controlling the Transfer Bias....................................................................................................................................................... 6-86.8.2.1 Transfer Roller Bias Control ...........................................................................................................................................................................6-86.8.3 Separation Mechanism................................................................................................................................................................. 6-86.8.3.1 Static Eliminator Bias Control ........................................................................................................................................................................6-86.9 Photosensitive Drum Cleaning.......................................................................................................................................6-96.9.1 Outline.......................................................................................................................................................................................... 6-96.9.2 Waste Toner Full Detection ......................................................................................................................................................... 6-96.10 Parts Replacement Procedure.....................................................................................................................................6-106.10.1 Drum Unit ................................................................................................................................................................................ 6-106.10.1.1 Removing the Drum Unit............................................................................................................................................................................6-106.10.2 Developing Assembly .............................................................................................................................................................. 6-106.10.2.1 Removing the Developing Assembly..........................................................................................................................................................6-106.10.2.2 Precautions about Installation of Developing Assembly ...........................................................................................................................6-106.10.2.3 Procedure after Replacing the Developing Assembly ................................................................................................................................6-106.10.3 Transfer Charging Roller ......................................................................................................................................................... 6-116.10.3.1 Removing the Transfer Charging Roller.....................................................................................................................................................6-11