Before You Start - Clarity SN-4215-P User Manual

2.1 Before You Start...

Here are some questions you need to answer before installing these displays: How high should the
displays be mounted? Will there be adequate ventilation? How strong do the mounting points need to
be? How will power and signal cable be routed? Is there adequate AC power available? Should the
display be oriented Landscape or Portrait? Where will the power supply go?
Weight—Each display, without the power sup-
ply, weighs 65 lbs. (29.5 kg). Most displays are
mounted on walls using the Clarity mounting
brackets. The wall must be strong enough to
hold this weight.
Power—Each display draws a maximum of 8.7
amps at 115 VAC (4.4 amps at 230 VAC). Usu-
ally the current is less than this, around 3 amps,
but you have to prepare of the maximum. No
more than two displays should be used on a
normal 115 V, 20 A circuit.
One potential problem with any plasma display
is image retention. Still images left on the
screen for as little as ten minutes can leave a
permanent image. This is sometimes called
"burn-in." The SN-4215-P is not a good choice
of display product that will show one image for
a long time.
WARNING
Do not allow still images to stay on
the screen for more than a minute or
two.
What kind of applications might produce
burn- in? Any application where the same thing
will be shown in the same part of the screen for
a long time. For example:
• Each picture is on the screen for more
than one or two minutes.
• Text displays, where the headline, or
some other part, never changes, even
though the rest of the text continually
changes.
• Moving images in which the background
2 - 2
never changes, such as the background in
video conferences.
What does a burned-in image look like? Burn-
in is not noticeable until you go to the next
image. Then you see a ghost of the first image
over the second image.
Can a burned-in image be fixed? Yes, some-
times. If the burn-in isn't too bad, you can try
displaying a white image for several minutes.
Use a completely white image, without any
other picture information in it. There is no
guarantee that this will work every time.
Of course, the best way to cure any problem
is not to have the problem in the first place.
• Do not allow still images to stay on the
plasma screen for more than a minute or
two.
• Do not use still images if they are high
contrast.
• Avoid a series of still images where one
part of the screen doesn't change, such as
tables of figures where the column head-
ings never change.
• Avoid moving images where part of the
screen doesn't change, such as video con-
ferences, where the picture hanging on the
wall behind the speaker and the filing cab-
inet in the background never move. And
even the speaker hardly moves!