12Make sure the projector is not tilted sideways. If the projector is tilted to one side, loosen the set screw on the front of the mounting bracket (shown below) and adjust the projector so it’s level. Tighten the set screw when done.
13If you’ve used the extension arm, make sure the projector is not tilted down toward the screen. Loosen the set screws on the side of the arm and adjust it so it’s straight. Tighten the set screws when done.
Note
For most installations, the projector should be mounted level (not tilted down toward the screen). If you find that the image is too high or too low, you can reposition it using the vertical lens shift dial. If you have the PowerLite Home Cinema 720, you can tilt the projector down if necessary and use the keystone adjustment to correct the resulting image distortion (see “Adjusting the Image” on page 51).
To level the projector, loosen these set screws and adjust arm
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