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Ensure that the projector is placed parallel to the wall/screen and that the table is level;
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Make sure the wall/screen is flat, try to project on another wall / Screen;
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Make sure the keystone correction is in the middle position, please adjust the focusing ring to improve the picture definition. Recommended adjusting the keystone correction ring in case of keystone distortion in the image;
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Check whether the focus has been adjusted to the best position, Please move the projector forward or backward proportionally in case the adjustment is unable to obtain a satisfactory definition;
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Explain to the customer in the middle of the focus is clear, a little blurred edge is a normal phenomenon, and you can take pictures to confirm;
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Replace.
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