Computer to Video
Converter 		SCAN DO 1024


The heart of a videoconference system, the CODEC, transmits either a NTSC or a PA L video-signal. Because of differences in resolution (number of lines in a picture), refresh rates (speed with which a picture is recreated on the display), and lacing (television are "interlaced" - the odd and even lines are generated separately, whereas computers are "non-interlaced"), you need a computer-to-video converter to send a computer signal through a videoconference system or to display a PC image on any standard TV set. The Scan Do accepts graphical data from a PC (VGA) or MAC signal and converts them into video formats (composite video, S-VHS and analog RGB).

  Setting Up The Computer to Video Converter
 
  1. Connect the appropriate ends (based on VGA/PC or MAC) of the 15-pin cable to both the computer out and ScanDo in.
  2. Connect RCA type video cable to the Composite (video out) terminal of the Scan Do.
  3. Connect the other end of the RCA type video cable to the video input of a videoconference unit, TV monitor, VCR, or video projector.
  4. Make certain the power sources are connected and turn on ScanDo and the TV monitor. (It is important to turn on the ScanDo BEFORE the computer so that the computer will identify it.)
  5. If using with a videoconference unit, be certain to choose the appropriate input from the keypad.



  Using The Computer to Video Converter

 
  1. Check the front of the Scan Do to be sure that there are green lights at both the "power" and "input" indicator.
  2. Open the appropriate Computer application for sharing. You should see this on both the computer screen and display
  3. Adjust image location on the display by using the up, down, right, and/or left arrows as well as the underscan/overscan to "zoom" in or out of the image.
  4. If the image appears to "flicker," press the "anti-flicker" button.
  Troubleshooting
 
  • Nothing works or there is no video output
    If there is not a green light for the input indicator, the ScanDo is not "seeing" the computer. Recheck the cables and/or restart the computer with the ScanDo powered on.
    Is the green POWER LED lit? If it is not, check to make sure that the external AC power supply is plugged into both the Scan Do unit and the AC wall outlet. Check to make sure that the computer is properly sending out aVGA or Mac signal by plugging the monitor directly into the computer’s video output.
  • No video on outputs (just a color test pattern)
    Is the green Input LED lit? If it is not, check that your computer is correctly connected to the Input connector on Scan Do Select.
    If it is connected properly, then your computer may not be producing a resolution within the valid range (Scan Do 1024 supports resolutions up to 1024 x 768, VGA, SVGA and Mac, at vertical refresh rates up to 75 Hz.) or may not be producing any signal at all. Press the Test button to see if you get color bars on the composite and S-Video outputs.
    If you do get color bars, then the problem is related to your input signal. Check the items mentioned above. If you do not get color bars, the problem is related to your output. Is the VCR or video monitor in the proper mode to accept direct video input? Is the output cable connected properly? When using a laptop, try turning off the laptop’s LCD screen and having the VGA signal output through the external port only.
  • Some of the image is being lost off the sides, top or bottom.
    This is normal if you are in the overscan mode. If you need to see the lost areas, toggle the overscan button off..
  • The color on the TV monitor is different than the color on the computer monitor.
    The colors on your TV display will never exactly match the colors on your computer monitor because each of these devices reproduce color differently.
  • All I see on the TV/monitor is "snow" when I connect Scan Do to it.
    Since you are using a TV in its monitor mode, the TV is still set to show video from its tuner and not from the Video or S-video input. Make sure the TV is switched to the “Video” or “Aux” input mode. If you are using the ScanDo with a videoconference unit, be sure you have selected the proper input.
  • Why is the text of the Windows desktop almost unreadable on my video monitor?
    It requires a lot of bandwidth or resolution to reproduce all the detail that makes up small text. TV monitors, by design, do not have the resolution to reproduce all the detail found in some computer screens. That’s why they invented computer monitor