Extron electronic MAV Plus - Manual (Page 76)

Operation, cont’d
CrossPoint 450 Plus and MAV Plus Switchers • Operation 3-46
PRELIMINAR
Y
Troubleshooting
This section gives recommendations on what to do if you have problems operating
the CrossPoint 450 Plus or MAV Plus 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 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.
Plasma display S-video problem
(CrossPoint 450 Plus wideband BMEs only)
Extron has encountered a problem 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 fi ne. 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.
Confi guration Worksheets
Rather than trying to remember the confi guration for each preset, use worksheets to
record this information. Make copies of the blank worksheet on page 3-51 and use
one for each preset confi guration. 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.
Worksheet example 1: System equipment
Figure 3-72 shows a worksheet for a 48-input by 32-output system in a fi ctional
organization with the system hardware annotated. Inputs 10, 11, 25, 30, 35, 40, and
45 through 48 have no connections in this organization, so they have been crossed
out on the worksheet. Inputs 49 through 64 do not exist on this model, so they are
crossed out. Similarly, outputs 7, 14, 15, 16, and 33 through 64 are crossed out.
Inputs include PCs, an audio CD player, cameras, and an Extron VTG 450. Output
devices include monitors, front and rear projectors, a stereo, and a VCR for
recording presentations.
The Extron VTG 450 video test generator connected to input 12 enables a video
test pattern to be sent to one, several, or all output devices for problem isolation or
adjustment purposes. An audio test tape or CD could be used in a similar manner
to check out the audio components.