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PART
7:
Routine Maintenance
OPTIMOD-TV
is
a
highly stable device
which
uses solid-state circuitry
throughout.
Recommended
routine
maintenance
is
minimal.
1)
Particularly
in
humid
or
salt-spray
environments,
check
periodically
for
corrosion around
metal-to-metal
contacts such
as
the audio
and
control
wiring,
and
those places
where
the
OPTIMOD-TV
chassis
contacts the
rack.
Check
for
loss
of
grounding
due
to
corrosion
or
loosening
of
rack
mounting
screws.
2)
Familiarize
yourself
with
the
normal
VU
meter
readings,
and with the normal
performance
of
the
G/R
meters.
If
any
meter
reading
becomes
abnormal,
refer
to
Appendix
F
(Trouble Diagnosis).
3)
A
good
ear
will
pick
up
many
failures.
Familiarize yourself with the "sound"
of
OPTIMOD-TV
as
you
have
set
it
up,
and
be
sensitive
to
changes
or
deteriorations.
But
if
problems
arise,
please don't
blame
OPTIMOD-TV
by
reflex.
Refer
to
Appendix
F
for
systematic troubleshooting
instructions
which
will
also
help you determine
if
the problem
is
in
OPTIMOD-TV
or
is
somewhere
else
in
the
station's
equipment.
4)
To
clean
the
panel,
wash
it
with
a
mild
household
detergent
and water.
Stronger
solvents
may
damage
plastic
parts, paint,
or
the silkscreened
lettering,
and
should not be used.
ROUTINE
This procedure can be
performed
very
quickly,
and
provides
tests of
some
of
the
PERFORMANCE
more
important
OPTIMOD-TV
performance
parameters.
A
much more
thorough and
VERIFICATION
rigorous
procedure
is
provided
in
Appendix
D
(Field
Audit-of-Performance
Procedure).
Audio
Processing:
There
are
no
effective,
quick instrument
tests that
can
be
made
using
ordinary
program
material.
Your
ear
is
the
best
test
instrument
here.
If
a
minute
or
so
can
be
spared from normal programming, the "standard
level"
test
can be
made
using a
sinewave
input.
This
is
done
as
follows:
1)
Record
the
settings
of
the
CLIPPING,
BASS
COUPLING,
RELEASE
TIME,
and
HF
LIMITING
controls
so that
they can
be restored
when
you have
completed
the
test.
2)
Set
the
OPTIMOD-TV
controls
to
the
following
"standard"
settings:
PROOF /OPERATE
SWITCHES:
OPERATE
CLIPPING:
+2
RELEASE
TIME:
10
RELEASE SHAPE
LINear
BASS COUPLING:
10
HF
LIMITING:
10
LOUDNESS
CONTROLLER
DEFEAT
3)
Drive
the
OPTIMOD-TV
left
channel (probably through
a
console
input)
with
a
1kHz
sinewave.
Adjust
the
oscillator
level
until
the
OPTIMOD-TV
TOTAL
MASTER
G/R
meter
reads
"0".
7-1
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