4.
Complete the connection between the two baluns, using standard Cat5 twisted pair
cable and connecting hardware, terminated on RJ45 plugs at both ends. Ensure that
there are no split pairs or taps.
5.
Power-on the audio-video equipment. Check the image quality and refer to the
troubleshooting table below if the image quality is unsatisfactory. The following
diagram shows a typical installation.
Troubleshooting
The following tables describe some of the symptoms, probable causes and possible
solutions in respect to the installation of the S-Video/Hi-Fi Balun. If you still cannot
diagnose the problem, please call Black Box Tech Support at 724-746-5500.
Video
Symptom
Probable Causes
Possible Solutions
No video
No continuity in video
link
Verify cable continuity between pairs
of baluns.
No video
Power off
Check power supplies of video
equipment.
No video
Improper connection
Swapped pairs
Check that baluns are connected to
correct video inputs and outputs.
Unusual colors
Reversed polarity
Check wiring and ensure straight-
through polarity
Background
pattern
EMI interference
Identify possible radiating frequency
sources (i.e.; wireless LANs,
switching power supplies) Try to
isolate them from the video
connection. Use shielded twisted pair
grounded at both ends.
Smearing
Exceeded distance
Verify cable grade. Use higher grade
cable if necessary.
Weak contrast
Exceeded distance
Verify cable grade. Use higher grade
cable if necessary. Increase contrast
on monitor.
Weak contrast
Unusual link attenuation
Verify cable distance using ohmmeter
or cable tester.
Image not stable
Defective link or
equipment
Verify video equipment interface
integrity.
Horizontal bars
moving slowly
Substantial crosstalk
between multiple video
sources
Consecutively turn off other video
sources to determine which video
source is the cause of interference.
Snowy picture
Distance is near limit
Verify cable grade. Use higher grade
cable if necessary. Reduce color
intensity at monitor.
Audio
Symptom
Probable Causes
Possible Solutions
Poor audio quality
EMI interference.
Check that wiring is not too close to
transformers and ballasts.
Split pair
Ensure that the UTP pairs are not split
and that each pair of wires is twisted.
No audio
No power
Check your audio system for power.
Open circuit
Check wiring to ensure continuity
Defective balun
Change S-Video/Hi-Fi Baluns for
another pair.
Audio phase
cancellation
Reversed wires
Check for straight-through wiring.
Audio weak
Distance specifications
exceeded
Check DC loop resistance and verify
if distance spec is exceeded. Reduce
cable length or eliminate high-loss
components.
