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3-41CrossPoint 300 Matrix Switchers • Operation
4. As necessary, adjust the input audio level of each input (see “Viewing and
adjusting the input audio level (HVA models)”, in this chapter) so that the
approximate output level is the same for all selected inputs.
Troubleshooting
This section gives recommendations on what to do if you have problems operating
the switcher, and it describes an actual image problem that Extron has encountered.
General checks
1. Ensure that all devices are plugged in and powered on. The switcher is
receiving power if the Esc LED flashes one time when you push the Esc
button.
2. Ensure an active input is selected for output on the switcher.
3. Ensure that the proper signal format is supplied.
4. Check the cabling and make corrections as necessary.
5. Call the Extron S
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Sales & Technical Support Hotline if necessary.
Plasma display S-video problem
Extron has encountered a problem when a matrix switcher with two or more video
planes routes S-video that is output by some video conference codecs. Some codecs
change the DC offset on the chrominance (C) so that it is very different from the
level on the luminance (Y). This can cause a plasma display to come up in the
wrong size mode.
With the matrix switcher taken out of the system, the plasma works fine. It looks
like a problem with the matrix switcher, but it is not. The matrix switcher boosts
the bad codec output, which makes the plasma go to the wrong setting.
Solution: Try placing an Extron video DC block adapter, part #26-495-02, on the
luminance (Y) input to the switcher from the codec.