Epson Stylus Pro 4400 Reference Manual page 279

5. Pull the paper guide roller up, and then slide the edge guide
to the left slightly wider than the width of your paper.
6. Clean the inside of the paper tray to remove any dust. Dust
may affect the print quality.
7. Fan a stack of paper, and then tap it on a flat surface to even
the edges.
If the paper is curled, flatten it before you load it. If it curls
excessively and jams frequently, stop using it.
Paper Handling
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