Extron Electronics MAV Plus series Large Scale User Guide - Manual (Page 82)

Operation, cont’d
CrossPoint 450 Plus and MAV Plus Switchers • Operation 3-50
Troubleshooting
General checks
This section gives recommendations on what to do if you have problems operating
the switcher.
1 . Ensure that all devices are plugged in and powered on. The switcher is
receiving power if one of the front panel Power Supply LEDs is lit green.
2 . Check to see if one or more outputs are muted.
3 . Ensure an active input is selected for output on the switcher.
4 . Ensure that the proper signal format is supplied.
5 . Check the cabling and make corrections as necessary.
6 . Call the Extron S 3 Sales & Technical Support Hotline if necessary. See the rear
cover of this manual for the phone number in your region of the world
Plasma display S-video problem
(CrossPoint 450 Plus wideband BMEs only)
Extron has encountered a problem that can occur when a CrossPoint 450 Plus
wideband switcher BME 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 #26-495-01, on the
luminance (Y) input to the switcher from the codec.
Configuration Worksheets
Rather than trying to remember the configuration for each preset, use worksheets
to record this information. Make copies of the blank worksheet on page 3-55 and
use one for each preset configuration. Cross out all unused or inactive inputs and
outputs. The worksheet accommodates all of the matrix sizes available with the
CrossPoint 450 Plus and MAV Plus models documented in this manual. Cross out
all unused or inactive inputs and outputs. Use different colors for video and audio.