Epson EMP-7550 Owner's Manual page 48

If you need to raise or lower the image on the screen, extend
or retract the two feet at the bottom of the projector as
follows:
1. Stand behind the projector and support the front of it
while you lift the foot adjust lever above the feet. This
unlocks the feet so they can move up and down freely. Do
not let the projector drop.
Caution: Do not hold the projector by its lens. This can damage
the lens.
2. While lifting the foot adjust lever, raise or lower the
projector until the screen image is positioned correctly.
3. Release the lever to lock the feet in their new position.
4. To fine-tune the height of the projector, turn the rear feet
clockwise to raise the height or anti-clockwise to lower it.
26