Xerox Phaser 3400 Reference Manual page 9

Loading the optional trays
4. Load the paper.
Make sure that you place the paper up against the left-front corner of the tray.
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Make sure that you place the paper under the tab at the back of the tray.
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Load letterhead face down with the top of the page toward the front of the tray.
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Don't load paper above the fill line. Don't load over 550 sheets.
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5.
If necessary, adjust the side guides to lightly touch the paper.
6. Slide the tray back into the printer.
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Phaser 3400 Personal Laser Printer