Scanning Section - Muratec MFX-2500 Field Engineering Manual

2.3 Scanning Section

2.3.1 ADF Section
When a document is placed into the document feeder, Document Sensor 1 (DS1) is activated and you will
hear the short beep. The width of document is detected by DB4 and DA3 sensors and length of document
is detected by DADFA3 and DADFLEG sensors.
Document separation is the process that allows a multi-page document to go through the scanner one
page at a time. Separation occurs through the action of the separator roller and retard roller.
As shows in the illustrations, documents in the feeder are pressed against the separator roller. The bottom
document is separated from the remaining documents by the friction of the retard roller.
Following document separation, the feed roller causes the document to advance. As it advances, the
leading edge of the document activates the Document Sensor 2 (DS2) sensor. Once DS2 is activated, the
feed roller continues to rotate until the document reaches the scan wait position. The machine uses the
distance from DS2 to the scan wait position and the diameter of the feed roller to determine the number of
rotations necessary to feed the document to the scan wait position.
When the document reaches the scan wait position, the machine waits for the next command. It will start
scanning the document when either the start or copy key is pressed. The light from the scanner lamp
strikes the face of the document and is reflected into the lens through mirrors A, B, and C. In case the light
intensity along the length of the scanner lamp is not uniform, shading compensation is provided to ensure
even illumination.
As the reflected image passes through the lens, it is focused onto the charged coupled device (CCD).
The CCD then converts the dark and light areas of the image into electrical impulses, or image data.
When DS2 detects the trailing edge of the document, the image signal output is turned off. The scanner
continues to remain active for a few more seconds in case there is another document to follow.
Document scanning in ADF section
The scanned document is discharged through the document exit by the exit roller
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