Epson C2600/2600 Owner's Manual page 47

Note:
When you use A4, Letter or larger sizes of paper, unfold the
expansion tray 2 by lifting it up.
3. Pinch the knob and the paper guide together, then slide the
right paper guide outward.
Paper Handling
3
3
3
3
3
3
3
3
3
3
3
3
47