Troubleshooting - NDS EndoVue Plus 24" Benutzerhandbuch

Troubleshooting Section
Image Size is Very Large for the Screen
If the computer data does not appear to be the correct format, then SmartSync™ must be run. To run
SmartSync™, press the Menu button. Select the Setup menu. Press SCROLL to highlight SmartSync™ , then
press the fi button. SmartSync™ will run and size the image properly.
Ghosting in Characters
Ghosting in characters is usually attributed to reflections in the video cable or source. Use a high quality
coaxial 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 update will be the
same at all refresh rates.
Text is Too Small
Since the monitor accepts and displays computer data with a higher resolution than the display's native
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resolution, this may produce small text. In the Menu check the Display Mode tab. Verify that the computer
data resolution does not exceed the Native Resolution specification shown on page 17.
Character Jitter
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
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.
Black Screen
Power the display Off and On. If the NDS logo appears then the display is working properly. Check if the
power management feature (DPMS) is enabled. A "Searching" message appears when the video source is
not present or when an input source is out of the display's resolution range.
Setting Frequency, Phase and Sharpness
Windows Users: Open a WordPad document and set the font to Arial 8. Press the enter key to move the
cursor to the middle of the page. Hold the shift and + keys down to create a line of +s.
If the + signs appear in groups of light or dark, then the Frequency is not correct. Press the MENU button
to open the OSM, then SCROLL to the Frequency parameter. Press the fi or fl buttons to increase or
decrease Frequency. There will be a point were all the + signs snap into focus and are the same intensity.
Phase and Sharpness are subtle adjustments and are best set using a display calibration program.
Video Printer
When a video printer is used the signal is first connected to the video printer, then passed to the display
using one of the video printer's output ports. For RGBS or YPbPr signals verify that the signal is connected
correct input on the video printer, and that the video printer's RGBS or YPbPr output is connected to the
VGA/RGBS connector (shown on page 2) and that VGA/RGBS is selected for an RGBS signal, or YPbPr is
selected for a YPbPr signal on the input menu (see Connecting a Video Printer on page 5). For an S-Video
signal, connect the signal to the video printer's S-Video input, and then connect the video printer's S-Video
output to the display's S-Video connector, and select S-Video on the input menu.
If the video printer is correctly connected and there is no output from the video printer, refer to the video
printer's users manual or video printer's manufacturer for setup and usage assistance.
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