Operating instructions
This
section
of
the
manual
contains
information
for
performing
preventive
maintenance,
troubleshooting,
and
corrective
maintenance
for
this
instrument
.
Preventive
maintenance
consists
of
cleaning,
visual
inspection,
lubrication,
etc
.
Preventive
maintenanceperformed
on a
regu-
lar
basis
may
prevent
instrument
breakdownand
will
improve
the
reliability
of the
instrument
.
The
severity
of
the
environ-
ment
to
which
this
instrument
is
subjected
determines
the
frequency
of
maintenance
.
A
convenient
time
to
perform
preventive
maintenance
is
preceding
adjustment
of the
instrument
.
This
instrument
should
be
cleaned
as
often
as
operating
conditions
require
.
Accumulation
of
dirt
on
components
acts
as
an
insulating
blanket
and
prevents
efficient
heat
dissipation
which
can
cause
overheating
and
component
breakdown
.
Exterior
Loose
dust
accumulated on
the
front
panel
can be
removed
with
a
soft
cloth
or
small
brush
.
Dirt that
remains
can
be
re-
moved
with
a
soft
cloth
dampened
with
a
mild
detergent
and
water
solution
.
Abrasive
cleaners
should
not be
used
.
Interior
CLEANING
Avoid
the use
of
chemical
cleaning
agents
which
might
damage
the
plastics
used
in
this
instru-
ment
.
In
particular,
avoid
chemicals
that
contain
benzene,
toluene,
xylene, acetone,
or
similar
solvents
.
Dust
in
the
interior
of
the
instrument
should
be
removed
occasionally
due
to
its
electrical
conductivity
under
high-
humidity
conditions
.
The
best
way
to
clean
the
interior
is
to
blow
off the
accumulated
dust with
dry,
low-pressure
air
.
Remove
any
dirt
which
remainswith a
soft
brush
or
a
cloth
dampened
with
a
mild
detergent
and
water
solution
.
A
cotton-tipped
applicator
is
useful
for
cleaning
in
narrow
spaces
.
MAINTENANCE
PREVENTIVE
MAINTENANCE
Switch Contacts
Switch
contacts
and
pads
are
designed
to
operate
dry
for
the
life
of
the switch
.
However,
as
the
switches
are
not
sealed,
dust
attracted
to
the
contact
area
may
cause
switch
contacts
to
become
electrically
noisy
.
Cleaning
may
be
accomplished
by
flushing
the
contact
area
with
isopropyl
alcohol
or
kelite
(1
part
kelite
to
20
parts
water)
.
Do
not
use
chemical
cleaning
agents that
leave
a
film
or
that
might
damage
plastic
parts
.
Do
not
use
cotton
swabs
or
similar
applicators
to
apply
cleaning
agents,
as
they tend
to
snag
and
leave
strands
of
cotton
on
switch
contacts
.
Should
it
become
necessary
to
remove
a
switch
for
replacement
or
cleaning,
refer
to
Component
Removal
and
Replacement
in
this
section
.
VISUAL
INSPECTION
Section
4-71380
This
instrument
should
be
inspected
occasionally
for
such
defects
as
broken
connections,
improperly
seated
semicon-
ductors,
damaged
circuit
boards,
and
heat-damaged
parts
.
The
corrective
procedure
for
most
visible
defects
is
obvious
;
however,
particular
care
must
be taken
if
heat-damaged
components
are
found
.
Overheating
usually
indicates
other
trouble
in
the
instrument
;
therefore,
it
is
important
that
the
cause
of
overheating
be
corrected
to
prevent
recurrence
of
the
damage
.
LUBRICATION
Generally,
there
are
no
components
in
this
instrument
that
require
a
regular
lubrication
program
during the
life
of
the
instrument
.