Kramer Electronics VS-55YC - Manual (Page 14)

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10.1 Video Signal
Problem Remedy
No video at the output device,
regardless of input selected.
Confirm that your source and output devices are powered on and connected
properly. The input of your machine should be of an identical signal format at
the output of your source. Signals at the output of your machine should be of
an identical signal format as at the input of your display.
Confirm that any other device in the signal path have the proper input and/or
output selected.
Use the Video Tester to test the video path leading to/from your machine (see
section 4.1 "Video Tester")
Video level is too high or too
dim.
Verify that the lines are well matched through 75ohm impedance; otherwise it
results in a video level that is too high or too dim.
Confirm that the connecting cables are of high quality and properly inserted.
Check level controls located on your source input device or output display.
Noise bars "roll" 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.
WARNING!
Do not disconnect the ground from any piece of video equipment in your
signal path!
Check the following to remove hum bars:
Confirm that all interconnected equipment is connected to the same phase of
power, if possible.
Remove equipment connected to that phase that may introduce noise, such as
motors, generators, etc.
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.
10.2 Audio Signal
Problem Remedy
No audio at the output device,
regardless of input selected
Confirm that your sources and output device are powered on and connected
properly. Audio signals connected to the input of your machine should be
properly wired to the output of your source. Audio signals connected to the
output of your machine should be properly wired to the input of your machine
or recorder.
Confirm that any other amplifiers in the signal path have the proper input
and/or output selected. Pay special attention to input amplifiers that may be
built into your acceptor.
Audio level is too low
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.
Check level controls located on your source input device or output display or
recorder.