Canon i-SENSYS MF229dw Service Manual

22 2-62-6Technical Overview > Document Exposure/Feeder System > Document Exposure System > Major ComponentsTechnical Overview > Document Exposure/Feeder System > Document Exposure System > Major ComponentsDocument Exposure/Feeder SystemDocument Exposure System■ Overviewitem function / methoddocument exposure LEDdocument scan Book mode: scan by the shift of the contact Book mode: scan by the shift ofthe contact sensor (CS)SADF/DADF: document stream reading by fixed contact sensor (CS)Copey BoardScanning resolution600 dpi X 600 dpiADFscanning resolution300 dpi X 300 dpinumber of gradations 256 gradationsmagnification 50% to 400%horizontal: image processing by Main controller PCBvertical: change of carriage shift speed, image processing by Main controllerPCBlens rod lens arrayCMOS sensor number of lines: 1 linenumber of pixels: 5184 pixels as total pixels (5126 pixels as effective pixels)maximum document scanning width: 216 mmCS drive control drive control by Reader motordocument sizedetectionnoneT-2-2■ Major ComponentsFollowings are the major components for Document Exposure System.• The contact sensor to scan document• The Reader motor, the drive pulley, the drive belt, to shift the contact sensorIn image scanning control, the contact sensor is shifted by rotating the Reader motor basedon the drive signal from the SCNT PCB and scan the original on the copyboard glass. WhenADF is in use, image is scanned by feeding the originals by ADF instead of shifting thecontact sensor.Drive beltDrive pulleyDrive pulley Contact sensorReader motorF-2-5