Canon iR4570 Series Service Manual page 637

Contents
14.1 Making lnitial Checks .................................................................................................................................... 14-1
14.1.1 Site Environment ..................................................................................................................................... 14-1
14.1.2 Checking the Paper.................................................................................................................................. 14-1
14.1.3 Checking the Placement of Paper............................................................................................................ 14-1
14.1.4 Checking the Durables ............................................................................................................................ 14-1
14.1.5 Checking the Periodically Serviced Items............................................................................................... 14-1
14.1.6 Checking the Units and Functional Systems ........................................................................................... 14-2
14.1.7 Others ...................................................................................................................................................... 14-3
14.2 Troubleshooting.............................................................................................................................................. 14-4
14.2.1 Image Faults ............................................................................................................................................ 14-4
14.2.1.1 Uneven Density ................................................................................................................................ 14-4
14.2.1.1.1 Uneven Density in Sub Scanning Direction .............................................................................. 14-4
14.2.1.1.2 Uneven Density Caused by Irregular Rotation of the Main Motor ........................................... 14-5
14.2.1.2 Partially Blank/Streaked................................................................................................................... 14-6
14.2.1.2.1 White lines appear in sub scanning direction on solid black and halftone images: Dust on .... 14-6
14.2.1.2.2 White lines appear in sub scanning direction on solid black and halftone images: Foreign .... 14-7
14.2.1.2.3 Horizontal Line/Blurring at Intervals of 94 to 95 mm .............................................................. 14-8
14.2.1.2.4 White Lines in Sub Scanning Direction .................................................................................... 14-9
14.2.1.3 Smudged/Streaked.......................................................................................................................... 14-11
14.2.1.3.1 Stray Toner Along Fine Lines ................................................................................................. 14-11
14.2.1.3.2 Soiled Image Leading Edge..................................................................................................... 14-12
14.2.1.3.3 Black Dots ............................................................................................................................... 14-14
14.2.1.4 Ghost/Memory................................................................................................................................ 14-15
14.2.1.4.1 Ghost........................................................................................................................................ 14-15
14.2.2 Malfunction ........................................................................................................................................... 14-16
14.2.2.1 No Power ........................................................................................................................................ 14-16
14.2.2.1.1 Upon installation, machine does not start up / LCD does not come on although main power .. 14-
16
14.2.2.2 Noise............................................................................................................................................... 14-17
14.2.2.2.1 Noise at Time of Pickup from the Cassette ............................................................................. 14-17
14.3 Outline of Electrical Components ................................................................................................................ 14-18
14.3.1 Clutch/Solenoid ..................................................................................................................................... 14-18
14.3.1.1 Clutches and Solenoids................................................................................................................... 14-18
14.3.2 Motor ..................................................................................................................................................... 14-19
14.3.2.1 Motors............................................................................................................................................. 14-19
14.3.3 Fan ......................................................................................................................................................... 14-22
14.3.3.1 Fans................................................................................................................................................. 14-22
14.3.4 Sensor .................................................................................................................................................... 14-23
14.3.4.1 Sensors............................................................................................................................................ 14-23
14.3.5 Switch .................................................................................................................................................... 14-28
14.3.5.1 Switches.......................................................................................................................................... 14-28
14.3.6 Lamps, Heaters, and Others .................................................................................................................. 14-29
14.3.6.1 Lamps, Heaters, and Others............................................................................................................ 14-29
14.3.7 PCBs ...................................................................................................................................................... 14-32
Contents