Polaroid Polaview 305 - Manual (Page 104)

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).
Troubleshooting 101