10
VGA SOURCE AND DISPLAY BALUNS
4. Troubleshooting
4.1 Troubleshooting Tips
If your equipment malfunctions with the VGA Baluns in place, follow the
troubleshooting procedures below:
1. Perform diagnostics on your video equipment by following the
manufacturer’s instructions.
2. Check all the connections and verify the pin configuration.
3. The maximum distances supported by the VGA Balun depend on the type of
UTP cable and the PC’s VGA interface’s image resolution. Make sure that the
maximum recommended operational distances have not been exceeded.
4. Check that only twisted-pair patch cords are being used.
5. Replace the VGA Balun with another balun that is known to be working
properly.
6. If you still cannot diagnose the problem, call Black Box Technical Support as
described in Section 4.3.
4.2 Application Tips
1. For proper operation, the VGA source and VGA display must share a
common ground. When the signal ground between the VGA source and the
VGA display is not common, then you must use CAT5 shielded twisted-pair
cable and shielded RJ-45 connectors. For more information, call Black Box
Technical Support at 724-746-5500.
2. The VGA Balun does not support the VGA handshaking and control signals
required by certain video monitors. Before installing the VGA Baluns,
connect the standard VGA cable between the VGA source and destination,
then set the monitor to the desired attributes. Install the VGA Baluns and the
twisted-pair cable.
3. For optimum results and maximum distance performance, first set the
brightness and contrast levels on the monitor to the maximum settings.
Then install the VGA Baluns and the monitor in its final location. After the
monitor is installed, adjust the brightness and contrast to the desired levels.
