Originally Posted by
adriansto
This is what the manual say:
The signal from the Platen Angle Sensor indicates when the DADF opens and closes. The control logic responds to a "closed" signal by initiating size sensing. Size sensing also occurs when a user presses the Start button with the DADF open.To determine a document's width, the Exposure Lamp is switched on momentarily, the document is illuminated, and the CCD Image Sensor detects the width (fast scan direction) to the nearest millimeter.
A document's length (slow scan direction) is detected by the APS Sensors 1 and 2.
A look-up table is used to determine the size of the document.
If two documents are the same size in the fast scan direction, their slow scan size is determined based on which, if either, of the APS Sensors detects them.
Example: The scanner different-iates between an A4 LEF and an A3 SEF document because only the A3 SEF document is detected by the APS Sensors.
The WorkCentre 7120 models for XC have two APS Sensors. These sensors distinguish between 8.5"x11" SEF, 8.5"x13" SEF, and 8.5"x14" SEF.
APS sensor no 2 is near lens.
Bookmarks