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PART
7:
Routine Maintenance
C)PTIMOD-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
PERFORIVIANCE
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 lkHz
sinewave.
Adjust
the
oscillator
level
until
the
OPTIMOD-TV
TOTAL
MASTER G/R meter reads " 0".
7-1
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