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18
Figure
12
: SG-6N Fuse Location
10.2 Video Signal
Problem Remedy
No video at the output
device
1. 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.
2. Confirm that any other device in the signal path have the proper input
and/or output selected.
3. Use the Video Tester to help trace faulty cables and equipment (see
section 4.1).
Video level is too high or
too dim.
1. Verify that the lines are well matched through 75ohm impedance;
otherwise it results in a video level that is too high or too dim.
2. Confirm that the connecting cables are of high quality and properly
inserted.
3. Check level controls located on your source input device or output display.
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 cables.
WARNING!
Do not disconnect the ground from any
piece of 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 interconnecting cables and reconnect them one at a time
until the ground loop reappears. Disconnect the affected cable and replace,
or insert an isolation transformer in the signal path.
4. Use a video Isolator, such as Kramer OC-1N or a differential amplifier
such as Kramer 123V inserted in the video signal path.