Orban 8182A Operating Manual page 35

The
front panel
may now
be closed and
fastened
using the three hex-socket
screws. Normally,
all
access required
from
now
on can be achieved through the
smaller access door (equipped with a key
lock).
Initial
Electrical
Checkout: Plug
the
power
cord
into
an
outlet
whose
voltage
corresponds
to the setting of the internal
LINE
VOLTAGE SELECTOR
switch.
The
unit
should
spring to
life.
Check
to
make
sure that the following events occur:
A)
The
green
POWER
LED
is
illuminated;
B)
The
red
GATE LED
is
illuminated (provided that the
COMPRESSOR
PROOF/OPERATE
switch
is
in
OPERATE);
C) Both yellow
HF
LIMIT
LED's
are off;
D)
The
TOTAL MASTER
G/R,
COMPRESSION MASTER
G/R,
and
TOTAL
BASS
G/R
meters
drift
slowly to "0", while the
LIMITING
MASTER
G/R
meter reads
"0"
immediately.
E)
All
VU
meter
positions
read
"0%"
except
for
"+I5VDC" and "-15VDC", which
read
100% +5%.
If
anything
is
abnormal, repeat the Physical Inspection described
above
to
make
sure that
you
didn't
miss anything.
A
preliminary diagnosis should be
made, and
if
necessary, the factory should be consulted.
If
you
wish
to
perform
a
more
rigorous
and complete checkout before installation,
Appendix
D
(Field
Audit-Of-Performance Procedure) provides
complete
instructions.
Equipment
Location:
OPTIMOD-TV
is
supplied
in
either single-chassis or
dual-
chassis
versions.
The
dual-chassis version
splits
the
system
at
the output of the
compressor. The
studio chassis
may
be located
in
any convenient rack space
in
the
studio.
It is
important
to
bear
in
mind
that
its
RFI
suppression
is
modest because
it
was assumed
that the unit
would
be
operated
at
a
considerable distance
from
high-powered
transmitters.
The
main
chassis,
which
is
highly
RFI-suppressed,
is
ordinarily located reasonably
close to
the transmitter's aural exciter or
phase-linear
STL
transmitter.
The
chassis
requires 4 units
(7"/17.8cm)
in
a
standard 19" rack.
Although
a
good monitoring loudspeaker system
seems
rare
at
transmitter
sites,
such
a
system which can be
easily
heard
from the location
in
which
OPTIMOD-TV
is
mounted
will facilitate
subjective adjustments.
Difficult
Environments:
1.
Where
humidity
is
typically
high,
the
environment should
be
controlled to
prevent moisture from condensing
on circuit
cards of
all plant
equipment,
including
OPTIMOD-TV,
as this
can degrade performance. Using
some
of
the
exhaust
from
the
transmitter
to
heat
the
building
slightly
above
ambient
temperature
is
often sufficient to
prevent problems.
2.
If
electrical
storms are frequent,
it
may
be advisable to add suitable Varistors
or
other
protection
between
each incoming wire (AC, remote
control,
and
audio)
and
a solid
earth
ground
as indicated
by
local
experience.
3.
OPTIMOD-TV
has
been
carefully
designed
to
operate
in
high-energy
VHF/UHF
environments
and no special
placement precautions
need be observed unless
RFI
is
encountered
in
operation.
4.
Please
remember
that the reliability of
any electronic
equipment
is
enhanced
by maintaining
moderate operating temperatures.
OPTIMOD-TV
should
never be
operated
in
ambient above 50 degrees
C
(122
degrees
F).
3-5