Polaroid Polaview 305 manual Adjusting contrast, and brightness, Adjusting sync, the dot clock

Troubleshooting 101

	Further parameter adjustments may be required to correct
	image problems for the best input source selection. A basic
	explanation of the adjustment functions follows.
	Note: Parameter modifications are saved each time you
	close the menus or turn off the power.
Adjusting contrast	Adjust the contrast so that the colors (particularly the gray
and brightness	shades) are right for the projected image. Buttons should
	look three-dimensional, as they do on your monitor. Adjust
	the Brightness to make the image clear.
Adjusting sync	Adjust the SYNC control to shift the dot clock phase to
	match the phase of incoming video signal. An incorrect sync
	setting causes “sparkles” and horizontal streaks randomly
	across the screen.
Adjusting	The Dot Clock control adjusts the projector dot-clock
the dot clock	frequency to match the incoming video signal frequency.
	An incorrect dot clock adjustment causes faint, uniformly-
	spaced vertical lines of video distortion/shading.
	Adjust the Dot Clock control slowly in the direction that
	causes the lines/bands of shading to get wider and fewer in
	number. There are no bands of distortion/shading when
	correctly adjusted.
Adjusting the	The Hor. Pos. (horizontal position) control adjusts the
horizontal position	amount of blanking before each horizontal line. Incorrect
	horizontal position adjustment can cause either side of
	the projected image to extend beyond the viewing area,
	end-of- line wrap around, or a half-normal display size.
Adjusting the	The Vert. Pos. (vertical position) control adjusts the amount
vertical position	of blanking before each video frame. Incorrect vertical posi-
	tion adjustment can cause the projected image to extend
	above or below the viewing area, video-frame overlap (lines
	from the bottom of one frame superimposed on the top of
	the next frame, or a horizontal or vertical double image).