Canon i-SENSYS MF229dw Service Manual

22 2-82-8Technical Overview > Document Exposure/Feeder System > Document Feeder System > Various ControlTechnical Overview > Document Exposure/Feeder System > Document Feeder System > Various Control• Reverse to Reading of the 2nd side• DeliveryF-2-9F-2-10■ Various Control● Original DetectionThere are two types of original detection in this equipment.1. Original Presence / Absence DetectionDetected by DS (Document Sensor)As the actuator is pushed up by placing an original on the Original Tray, DS of SADF isturned ON(light is blocked =>light is transmitted) and DS of DADF is turned OFF (light istransmitted => light is blocked) so that presence of an original is detected.2. Detection of the End of the OriginalDetected by the DES (Document End Sensor)The leading edge of the original that is fed pushes up the actuator, activating the DES (lightshielded =>light transmitted) and resulting in detection of the reach of the leading edge oforiginal. Furthermore, when the trailing edge of the original passes the actuator position,the actuator returns to the original position, inactivating the DES (light transmitted => lightshielded). The trailing edge of the original is detected by this mechanism. The originallength that can be scanned with this equipment is less than 400 mm. Passing of the originallonger than this results in jam stop. The original length is calculated by the time it takesfrom detection of the leading edge of the original to detection of the trailing edge of theoriginal.Note:There is no function to detect the original size (original width, length) in this equipment.