NDS EndoVue 19", Руководство пользователя

Страница: 25 / 32

Troubleshooting | 13
Troubleshooting
Image Size is Large for the Screen (VGA, RGBS, YPbPr analog inputs only)
If the image does not appear to be the correct format, then SmartSync must be run. To run SmartSync, press the
MENU button. In the Picture Menu, press the
SCROLL
button to highlight SmartSync and press the button.
SmartSync will run and optimize the image display properties.
Ghosting in Characters
Ghosting in characters is usually attributed to reflections in the video cable or source. Use a high quality cable
and, if possible, lower the vertical refresh rate. Lower scan rates can help eliminate reflections. Unlike a CRT, a flat-
panel will not flicker at lower refresh rates (60 Hz is optimal), and data will always be frame converted to 60Hz.
Character Jitter (VGA, RGBS, YPbPr analog inputs only)
If text characters seem to be “shaky” or bold, then Sharpness, Frequency and/or Phase may require adjusting. See
“Setting Frequency, Phase and Sharpness” below.
Character Noise and Vertical Distortion (VGA, RGBS, YPbPr analog inputs only)
The Frequency adjustment expands or contracts the horizontal size of the displayed image. The displayed image
may be too wide or too narrow and vertical banding and pixel jitter may appear in grays and light colors. Adjust
the Frequency until the image just fits the screen. Horizontal position adjustment can be used to verify that
Frequency is set correctly. Line up the image on the left edge of the screen and then shift by one “click” to the
right. The image should have one column off the screen on the right side if the Frequency is set correctly.
Testing and Adjusting Frequency (VGA, RGBS, YPbPr analog inputs only)
Using a connected laptop, open a blank text file, center the file window in the display, and set the font size and
style to 8 points Regular. Press the Enter key to move the cursor down to the center of the page, and then press
and hold the Shift and
+ keys to create a row of + symbols.
Inconsistent lighter or darker display variations of the + symbols is an indication that the Frequency parameter
requires adjustment. Press the MENU button to open the Picture Menu, then press the SCROLL button to select the
Frequency parameter. Next, press the or buttons to increase or decrease Frequency until reaching a point
where all + symbols display equally.
Note: Sharpness and Phase are subtle adjustments best set using a display calibration program.
Black Screen
Power the monitor Off and On. If the logo screen appears then the display is working properly. Check if the
power management feature (DPMS) is enabled. A “Searching” message appears in the lower right hand corner
when a video source is not present.