NEC WT600 Setup Manual page 13

[Symptom2]
In the case of keystone distortion (as illustrated), either the
screen is directed slightly downward or the projector is di-
rected slightly downward.
[Action]
Tilt the bottom end of the screen to the front or rotate the
rear feet (screen side) of the projector to correct keystone
distortion.
[Symptom 3]
As illustrated in the diagram to the bottom right, when the
left edge of the image is widened vertically, either the pro-
jector is not placed straight in front of the screen or the pro-
jector 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.
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