Orban 8182A Operating Manual page 44

3:
PROGRAM
From
this
point
on,
the procedure
is
identical for single-
and
dual-chassis
units.
TESTS
"OPTIMOD-TV INPUT" means
the input of the
Accessory
Chassis
in
dual-chassis
systems, and the main
input
in single-chassis
systems.
These
listening tests are
made
with
OPTIMOD-TV
set
up according
to our
Recommended
Initial
Control Settings
in
Fig. 4-5.
They
are
intended
to detect
obvious problems with audio
quality
which must be
resolved before
final
adjustments
are
made.
Once
initial listening tests
are
passed,
you can proceed
to adjust
OPTIMOD-TV
setup controls according
to
subjective requirements.
These
instructions apply
to
either
a
stereo or
mono
installation
except
as noted.
a)
Adjust
OPTIMOD-TV
controls according
to Fig. 4-5.
Do
not adjust the
INPUT
ATTEN
or
OUTPUT ATTEN
controls at
this
time.
If
you have
a
dual-chassis
system,
DO NOT READJUST
THE MAIN
CHASSIS INPUT
ATTEN CONTROLS
UNDER ANY
CIRCUMSTANCES!
ON
RELEASE
SHAPE
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OPERATE
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RIGHT LEFT
INPUT
ATTENUATOR
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BATE THRESHOLD
OUTPUT
ATTENUATOR
Fig. 4-5:
RECOMMENDED
INITIAL
CONTROL
SETTINGS
b)
Drive
OPTIMOD-TV
with typical audio at
your usual operating level.
Set your
console
in
MONO
mode,
such that both
channels are putting
out
identical
levels.
Peak
the console
VU
meters
at
OVU.
c)
Adjust
the
OPTIMOD-TV INPUT ATTEN
controls
(in
a dual-chassis installation,
on the
Accessory
Chassis
)
to
"0".
Advance
the
LEFT INPUT
ATTEN
until
the
TOTAL MASTER
G/R
meter
reads
approximately "OdB" +3dB.
Stereo
Installation
Only: Observe the
L-R meter
on your stereo
monitor and
advance the
OPTIMOD-TV RIGHT INPUT
ATTEN
until
the
meter
nulls.
Mono
Installation
Only:
(NOTE: The
output
amplifiers
must
be
strapped
in
L/R
mode.) Either load both
outputs with equal
impedances,
or
temporarily
disconnect both outputs from
the
system.
Connect
a
sensitive
AC
voltmeter
between
the
OPTIMOD-TV
(+)
LEFT
OUTPUT
and
(+)
RIGHT OUTPUT.
Advance
the
OPTIMOD-TV RIGHT INPUT ATTEN
until
the
meter
nulls.
Reconnect
the
outputs
to
the
system
as
necessary.
4-6