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4-1
S.
CLEANING
4-16.
The
instrument should be
cleaned periodically to
remove
dust, grease,
and
other contamination.
Since
the
instrument
is
completely
enclosed, having
no
fans,
the
need
for
cleaning
is
reduced.
Care has been taken to prevent
leakage,
through
the use
of
high
quality insulating materials
in
all
switches
and
through
special attention to
component
layout.
In
addition,
all
circuit
boards
are
coated with
a
moisture
sealant.
4-17.
To
clean the instrument, proceed
as
follows:
CAUTION!
Avoid
touching
the polyethelene
grommets;
contamination can
cause
excessive
electrical
leakage.
a.
Remove
loose
contamination
from
the instrument
with
low-pressure,
clean,
dry
air.
Pay
particular
attention to the front panel
binding
posts,
binding
post
wiring, switches,
and
polyethelene
grommets.
b.
Clean
the
polyethelene binding posts
and
the front
panel with
anhydrous
ethyl alcohol or
an
aerosol
can
of Freon
TF
Degreaser (Miller-Stephenson
Chemical
Co..
Inc.).
When
necessary, clean the
exposed
dielec-
tric
surfaces
of
switches
with
anhydrous
alcohol,
using
a small,
stiff-bristled
brush which
has
been
wrapped
with
a
clean
doth
to prevent
saturating
the switch contacts.
After
cleaning, recoat the ex-
posed
dielectric
surfaces
with
silicon fluid.
This
will
prevent leakage along
these surfaces
due
to moisture.
CAUTION!
Be?
not
use Metriclene, acetone, lacquer
thin-
ner,
Freon
TF
Degreaser,
or
any ketone
on
the
4-4
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