4.
MAINTENANCE
4.1
Preventive maintenance
Extensive use
of
integrated circuitry and solid
-
state
technology throughout the equipment ensure
a
high degree
of reliability
over
a
long,
trouble
-
free
service
life.
.
There
is
little
possibility that problem
will
occur within
a
few
years of installation, provided preventive
maintenance
is
properly carried out.
performed regularly
to
ensure satisfactory operation and
performance, reduce the possibility of
electrical
and
mechanical malfunctions, and
to
prolong service
life.
are
listed
on the following pages.
Preventive maintenance
for
the
RA770UA
radar
must
be
The maintenance
to
be performed
at
regular intervals
WARNING: Never
inspect the equipment when the
POWER
SWITCH
on the display unit
is
turned
ON
(The power switch on the
switchboard must be turned
OFF.
For
more
safty maintenance,
take of fuses on the display unit.).
After
the
POWER
SWITCH
is
turned
OFF,
high
static
voltage may be retained
in
the
CRT
high
-
voltage circuit and capacitors are a potential hazard
to
personnel. Discharge high
static
voltages to ground by using an
insulated conductor before maintenance.
>ocation
Procedure
Check radiation
surface(radome) for
clogging
or
accumulation of
soot, salt, oil,
or
paint.
If found, rinse the surface
with pure water and wipe
off moisture with a soft,
clean cloth. (Never
use
solvents such as gasoline,
benzine, trichloroethylene,
or
"
thinner
"
.
Check for loose bolt
-
nuts
and corroded portions of
scanner unit mount and
baseplate.
Check
for loose contact on
each connector of printed
circuit board, and for
imperfect mounting of any
component.
If
loose, re
-
tighten
with
2
wrench.
Also
check
for
improper
seating of the gasket for
the cover, corroded
portions
in
the interior
surfaces
or
on case
surface.
Clean the display surface
with
a
soft, pure water
moistened cloth.
4-
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