11
VGA SOURCE AND DISPLAY BALUNS
4. If the video image is not present or is poorly synchronized, there may be a
grounding problem or a high level of noise on the line. To correct the
problem, verify ground continuity on the baluns’ transmitting and receiving
pins or use shielded twisted-pair (STP) cable between the baluns.
5. In certain PC applications such as Microsoft
®
PowerPoint
®
presentations,
image resolution may be less critical, so longer than specified distances may
be achieved.
4.3 Calling Black Box
If you determine that your VGA Source Balun or VGA Display Balun is
malfunctioning, do not attempt to alter or repair the unit. It contains no user-
serviceable parts. Contact Black Box at 724-746-5500.
Before you do, make a record of the history of the problem. We will be able to
provide more efficient and accurate assistance if you have a complete description,
including:
• the nature and duration of the problem.
• when the problem occurs.
• the components involved in the problem.
• any particular application that, when used, appears to create the problem or
make it worse.
4.4 Shipping and Packaging
If you need to transport or ship your VGA Balun:
• Package it carefully. We recommend that you use the original container.
• If you are shipping the balun for repair, make sure you include everything that
came in the original package. Before you ship, contact Black Box to get a
Return Authorization (RA) number.
