NEC WT615 - Manual (Page 46)

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3. Projecting an Image (Basic Operation)
[Symptom 3]
As illustrated in the diagram to the right, when the left edge of the image is wid-
ened vertically, either the projector is not placed straight in front of the screen or
the projector is directed slightly to the left.
Conversely, when the right edge of the image is widened vertically, either the
projector is not placed straight in front of the screen or the projector is directed
slightly to the right.
[Action]
Place the projector straight in front of the screen.
Make sure that the screen and the projector are parallel to each other.