Samsung MultiXpress M5370 Series Service Manual page 61

[ M4370 ]
The machine has a beam detector sensor. It is located on the corner (mark "A")
The photo sensor detects the point of scanning start.
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Main Scan Start Detection
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A beam is detected by the photo sensor at the scanning start point and creates the horizontal sync signal (Hsync).
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The picture above shows the data scanning direction.
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2. Product Specifications and Description
2-47