Справочник Пользователя для HP (Hewlett-Packard) ep7100 Series

If the projector is tilted up or down, the sides of the picture on the screen might 
slant in or out, even though the top and bottom are level. Keystone adjustment 
corrects this problem:
■ Press the keystone adjustment on the projector or on the remote control until 

the picture looks correct.

You can also make the keystone adjustment in the on-screen menu. Press menu, 
and go to Picture > Shape settings > Keystone to adjust the picture. 

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If the top and bottom of the picture slant in different directions, move the 
projector until it is straight in front of the screen, not off to one side.

You can control the volume of the projector’s speakers:
■ To change the volume of the projector’s speakers, press the volume 

adjustment on the projector or remote control.

■ To turn the sound on or off, press the mute button on the remote control, or 

press menu, go to Input > Mute, and mute the sound.