Sierra Video VS User Manual download pdf (Page 62)

SIERRA VIDEO SYSTEMS

Video Signal

Problem Remedy

No video at the

output device,

regardless of input

selected.

 Confirm that your sources and destination device are powered on and

connected properly. Video signals connected to the input of the switcher

should be of an identical signal format as the output of your source. Video

signals at the output of your switcher should be of an identical signal form

required by your video monitor or recorder.

 Confirm that any other switchers in the signal path have the proper input

and/or output selected.

 Use a Video Tester to test the video path leading to/from your Matrix Switcher.

 Replace the video crosspoint module with one that is known to be functional.

Video level is too

high or too dim.

 Verify that the video line is terminated with a precision 75 ohm impedance,

otherwise it results in a video level that is too high or too low when looping is

performed and the termination is not within 1% of 75 ohms.

 Confirm that the connecting cables are of high quality, properly built and

terminated with 75 ohms. Check level controls located on your source input

device or output monitor or recorder.

 Replace the video crosspoint module with one that is known to be functional.

Problem Remedy

Noise bars are "rolling"

up or down in the output

image

or:

Low Frequency hum in

the audio output of the

audio

Hum bars (ground loop) are caused by a difference in the ground potential

of any two or more devices connected to your signal path. Passing that

voltage difference through any available interconnection, including your

video cables, creates hum bars in the picture and/or hum in the audio.

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

the ground loop reappears. Disconnect the cable, or insert an isolation

transformer in the signal path.

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Sierra Video VS User Manual Page 62

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