User manual
Solutions to Common Problems
5
5 Solutions to Common Problems
In most cases, nearly every issue with the Cobra T2 CAT 5 Video System can
be resolved by checking the CAT 5 termination and making sure that it’s
pinned to the TIA/EIA 568B wiring specification. However, there may be
other problems that cause the system to not perform as it is designed. Below
are solutions to the most common installation errors.
Problem:
No video signal at the transmitter local port or at the receiver.
Solution:
Check that both units are powered.
Ensure receiver EQ adjustment is set correctly — turn knob
slowly.
Make sure the CAT 5 cable is terminated correctly per the
TIA/EIA 568B wiring specification.
Is the display device powered on and functioning?
Check to ensure display settings (resolution, refresh rate, and so
on) are compatible with input signal.
In some cases, the video termination may be mismatched. The
transmitters and receivers ship with 75-ohm termination as the
default. To disable termination, see Appendix B.
Problem:
Poor video quality.
Solution:
Have all receiver adjustments been finished?
Ensure EQ adjustment is set correctly — turn knob slowly.
Check all cable connections.
The video signal’s refresh rate may be set too high. Reset to a
lower refresh rate in your monitor-configuration menu.
There may be a delay skew issue. See the section on Skew in the
receiver manual.
There may be a DDC compatibility problem. See Appendix G.
Problem:
Poor audio quality.
Solution:
Powered speakers are required. Make sure speaker power is ON.
Check input source levels from the source device. Make sure the
audio source is not overdriven or underdriven.
Audio is summed left and right for “A” versions. If using a single
channel, both audio inputs must be connected at the transmitter
end for full audio gain. Audio is line level.
S2 serial//audio units support full stereo line level. A high
frequency noise may be heard if the CAT 5 cable from the
transmitter is disconnected, or the transmitter is not powered up.
This is normal and will disappear once a complete link connection
is made.