Epson Stylus Pro 4880 User Manual page 164

7. Align the right side of the paper with the arrow mark on the paper tray
cover, as shown below. Align the bottom edge of the paper with the
appropriate line on the paper tray. If your paper size is Letter, A4, or B4,
align the paper edge with the LTR/A4/B4 line. If you're using another paper
size, align the paper edge with the OTHERS line.
8. Close the top cover.
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Paper Handling