Acer X1173 - Manual (Page 21)

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Adjusting the Projected Image
Adjusting the Height of the Projected Image
The projector is equipped with two elevator feet for adjusting the image
height.
To raise the image:
1 Use the front Tilt adjusting wheel to raise the image to the desired
height and angle.
2 Use the rear Tilt adjusting wheel to fine-tune the display angle.
To lower the image:
1 Use the front Tilt adjusting wheel to lower the image to the desired
height angle.
2 Use the rear Tilt adjusting wheel to fine-tune the display angle.
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Tilt adjusting wheel Tilt adjusting wheel