22 2-72-7Technical Overview > Original Exposure System > Major ComponentsTechnical Overview > Original Exposure System > Major ComponentsOriginal Exposure SystemOverviewitem function / methoddocument exposure LEDdocument scan Scan by the shift of the CIS Unitscanning resolution 600 dpi x 400 dpi, 600 dpi x 600 dpi (Horizontal x Vertical)number of gradations 256 gradationsmagnification 50 % to 200 % (10 % increment)Horizontal: image processing by Main Controller PCBVertical: change of carriage shift speed, image processing by MainController PCBlens CIS / ColorCIS Unit number of lines: 1 linenumber of pixels: 5148 pixels as total pixels (5104 pixels as effectivepixels)maximum document scanning width: 216 mmCIS Unit drive control drive control by Reader motor (M3)document size detection noneT-2-2Major ComponentsFollowings are the major components for Document Exposure System.• The CIS Unit to scan document• The Reader motor, the drive pulley, the drive belt, to shift the CIS UnitIn image scanning control, the CIS Unit is shifted by rotating the Reader motor based on thedrive signal from the Engine Controller PCB and scan the original on the copyboard glass.Drive BeltDrive PulleyDrive Pulley CIS UnitReader Motor(M3)F-2-5