ContentsContents4.1 Construction ....................................................................................................................................................... 4-14.1.1 Major Components ...................................................................................................................................... 4-14.2 Parts Replacement Procedure............................................................................................................................. 4-24.2.1 Reader Unit.................................................................................................................................................. 4-24.2.1.1 Removing the Rear Cover .................................................................................................................... 4-24.2.1.2 Removing the Right Cover................................................................................................................... 4-24.2.1.3 Removing the ADF............................................................................................................................... 4-24.2.1.4 Removing the Printer Controller PCB.................................................................................................. 4-34.2.1.5 Removing the Image Processor PCB ................................................................................................... 4-34.2.1.6 Removing the Control Panel ................................................................................................................ 4-44.2.1.7 Removing the Reader Unit ................................................................................................................... 4-44.2.2 Copyboard glass .......................................................................................................................................... 4-54.2.2.1 Removing the Copyboard Glass........................................................................................................... 4-54.2.3 Sensor PCB.................................................................................................................................................. 4-54.2.3.1 Removing the Rear Cover .................................................................................................................... 4-54.2.3.2 Removing the Right Cover................................................................................................................... 4-64.2.3.3 Removing the ADF............................................................................................................................... 4-64.2.3.4 Removing the Copyboard Glass........................................................................................................... 4-74.2.3.5 Removing the Sensor PCB ................................................................................................................... 4-74.2.4 Scanner Motor ............................................................................................................................................. 4-74.2.4.1 Removing the Copyboard Glass........................................................................................................... 4-74.2.4.2 Removing the Reader Motor Drive Unit .............................................................................................. 4-84.2.5 Contact sensor ............................................................................................................................................. 4-84.2.5.1 Removing the Copyboard Glass........................................................................................................... 4-84.2.5.2 Removing the Contact Sensor .............................................................................................................. 4-8