Dell 1210S manual

HORIZONTAL POSITION—Press to move the image to the left and to move the image to the right.

VERTICAL POSITION—Press to move the image down and to move the image up.

FREQUENCY—Allows you to change the display data clock frequency to match the frequency of your computer graphics card. If you see a vertical flickering wave, use Frequency control to minimize the bars. This is a coarse adjustment.

TRACKING—Synchronize the phase of the display signal with the graphic card. If you experience an unstable or flickering image, use Tracking to correct it. This is a fine adjustment.

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Using Your Projector