When
the
system
is
first
installed
or
verification
of
system
operation
is
desired,
the
distribution
module
is
supplied
with
a
60
Hertz
frame
sync
generator
built
into
the
module.
It
is
activated
by
pushing
the
on/off
switch
for
"Setup
Frame
Sync"
to
the
"on"
position.
If
the
sync
generator
is
operating
and
a
valid
(36
to
80
Hertz)
external
frame
sync
signal
is
received
from
the
projector
or
other
source,
operation
of
the
test
generator
will
cease
and
the
emitter
arrays
will
be
synchronized
to
the
external
signal.
The
long
range
emitter
array
includes
a
laser
pointer
to
assist
in
aiming
the
emitter
array
at
the
screen.
The
laser
pointer
is
activated
by
a
switch
on
the
distribution
module
labeled
"Laser
Pointer",
but
can
only
be
activated
when
the
"Setup
Frame
Sync"
generator
is
operating.
This
prevents
the
laser
diode
from
being
turned
on
while
a
3D
video
is
being
shown.
For
diagnostic
purposes,
the
following
indicator
lights
are
provided:
1.
A
green
power
LED
indicating
that
the
module
has
power.
2.
A
green
sync
LED
positioned
over
the
input
connector
indicating
that
a
valid
(36
to
80
Hertz)
sync
signal
is
being
received.
3.
A
flashing
yellow
LED
positioned
near
the
"Setup
Frame
Sync"
label
indicating
that
the
test
generator
is
active.
4.
A
green
and
red
LED
are
positioned
over
each
of
the
four
output
connectors.
The
green
LED
indicates
that
an
IR
array
is
connected
to
the
output
and
is
receiving
power,
and
a
frame
sync
input
signal
is
transmitting
IR.
The
red
LED
indicates
that
an
array
is
connected
and
should
be
emitting
IR
radiation,
but
is
not.
A
red
LED
indicates
a
fault
condition
that
requires
attention.
The
green
LED
is
designed
to
provide
the
projection
personnel
assurance
that
everything
is
hooked
up
and
operating
normally
or
will
work
normally
when
an
input
sync
signal
is
received.
Should
the
operator
wish
to
completely
test
the
system,
he
can
activate
the
sync
generator
by
turning
"ON"
the
"Setup
Frame
Sync"
feature.
The
green
LED
with
the
absence
of
the
red
LED
will
now
indicate
that
the
system
is
working
and
emitting
IR
pulses.
Alternatively,
he
can
put
on
a
pair
of
glasses
and
look
through
the
projection
window.
In
the
absence
of
the
IR
sync
signal,
the
glasses
will
be
in
a
clear
state
(both
lenses
clear
–
at
least
as
clear
as
they
get
‐
100%
of
the
time).
In
the
presence
of
an
IR
sync
signal,
the
lenses
will
alternate
between
the
opaque
and
clear
state
in
synchronization
with
the
IR
signal.
They
will
alternate
too
quickly
to
have
the
flicker
perceived,
but
the
effective
transmission
will
drop
by
50%.
This
is
detectable
by
the
viewer,
but
not
objectionable
so
it
is
a
suitable
test
condition
just
before
the
movie
is
started
even
in
the
presence
of
an
audience,
if
needed.
