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Kramer Electronics Ltd.
23
Video Signal (continued)
Problem Remedy
Noise bars are "rolling"
up or down in the output
image
or:
Low Frequency Hum in
the output signal
Hum bars (ground loop) are caused by a difference in the ground potential of any
two or more devices connected to your signal path. This difference is
compensated by passing that voltage difference through any available
interconnection, including your video cables.
WARNING!
Do not disconnect the ground from any piece of
video equipment in your signal path!
Check the following to remove hum bars:
1.
Confirm that all interconnected equipment is connected to the same phase of
power, if possible.
2.
Remove equipment connected to that phase that may introduce noise, such
as motors, generators, etc.
3.
Disconnect all interconnect cables and reconnect them one at a time until
ground loop reappears. Disconnect the affected cable and replace, or insert
an isolation transformer in the signal path.
12.3
Audio Signal (FC-4208 only)
Problem Remedy
No audio at the output
device, regardless of
input selected
1.
Confirm that your source and output devices are powered and properly
connected. Audio signals connected to the output of your machine should be
properly wired to the input of your machine or recorder.
2.
Confirm that any other devices in the signal path has the proper input and/or
output selected.
Audio level is too low
1.
Confirm that the connecting cables are of high quality and properly built.
Take special care in noting the wiring configuration of balanced to
unbalanced cables.
2.
Check level controls located on your source input device or output display or
recorder.