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. CHAPTER 4: Troubleshooting
Problem: “ Green shift” or “green washout” on multimedia signals.
Solution: Please contact Technical Support.
The standard video/serial model is designed to function with DC
coupled signals in which the black level is referenced to 0 volts.
Nearly all VGA cards function this way.
Some media servers, however, provide AC coupled signals and
can cause a green color shift in the video. This is a result of the
sync clamping on the red and blue channels of the video/serial
model.
For five-component (RGB/H&V) AC coupled video, the
AC1004AR2 and single port transmitters have optional DC restoration
circuitry that is easily enabled via a dipswitch setting
(see
Appendix B ).
Problem:
Notes on Daisy Chaining:
Solution: When daisy chaining, the maximum cable distance is not
increased beyond the rated distance of the receiver used. For
example, an AC1062A-R2 can daisy chain within 600 ft of the
transmitter. It is possible to daisy chain out of a short range
receiver into a longer range receiver. For example, over 600 ft
an AC1062A-R2 can be daisy chained into on AC1063A-R2 which
allows for daisy chaining to 1200 ft.
A maximum of 12 units may be daisy chained together.
If a unit in the middle of the chain loses power or is disconnected
from the chain, all units beyond this point will lose signals.
Note that the middle units must have 4th pair termination off, and
the last unit must have 4th pair termination on. See Appendix E.
Note that units in the middle of the daisy chain must me the
AC10xxA-DA-R2 models and each daisy chain must be
terminated with an AC10xxA-R2 unit. This is required to
terminate the serial signals.
4.2 Calling Black Box
If you determine that your CAT5 Multi VGA System is malfunctioning, do not
attempt to alter or repair it. 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.
4.3 Shipping and Packaging
If you need to transport or ship your CAT5 Multi VGA System:
• Package it carefully. We recommend that you use the original container.
• If you are shipping the CAT5 Multi VGA System 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.
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