Canon MF4500 Series Service Manual

Canon MF4500 Series Service Manual Manual pdf 31 page image

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 theshift of the contact sensor (CS)SADF/DADF: document stream reading by fixed contact sensor (CS)scanning resolution 600 dpi (horizontal scanner) X 600 dpi (vertical scanner)number of gradations 256 gradationsmagnification 50% to 200%horizontal: image processing by SCNT PCBvertical: change of carriage shift speed, image processing by SCNTPCBlens rod lens arrayCMOS sensor number of lines: 1 linenumber of pixels: 5148 pixels as total pixels (5107 pixels as effectivepixels)maximum document scanning width: 216 mmCS drive control drive control by Reader motordocument size detection noneT-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 DCNT 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