Samsung MultiXpress M537x series Basic Manual page 52

Loading paper in the tray
2 Squeeze the paper width guide, and pull it to the end of the tray.
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2
1 Paper width guide
3 Squeeze the paper length guide, and pull it to the end of the tray.
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Flex and fan the edge of the paper stack to separate the pages before
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loading papers.
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1 Paper length guide
2. Media and tray
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