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Section
4-465
MAINTENANCE
Cabinet
Removal
WARNING
I
Dangerous potentials exist at several points through-
out
this instrument. When the instrument
is
operated
with the cover removed, do
not
touch exposed
connections or components. Some transistors may
have elevated
cases.
Disconnect power before cleaning
the instrument or replacing parts.
The
instrument
wrap-around
cabinet
can
be removed
in
the
following
manner:
1. Unwrap
the
power
cord
from
the
instrument
feet.
2. Remove
the
six screws
indicated
in
Fig. 4-1
and
remove
the
instrument
feet
and
rear ring assembly from
the
instrument.
3.
Slide
the
wrap-around
cabinet
to
the
rear
and
remove
the
oscilloscope.
To
replace
the
instrument
in
its
wrap-around
cabinet,
reverse
the
removal
procedure.
The
portable
wrap-around
cabinet
should
be installed
with
the
carrying
handle
pivot
points
positioned
toward
the
bottom
of
the
instrument.
PREVENTIVE MAINTENANCE
General
Preventive
maintenance
consists
primarily
of
cleaning
and
visual
inspection.
When
performed
on
a regular basis,
preventive
maintenance
can
prevent
instrument
breakdown
and
will improve
the
reliability
of
this
instrument.
The
severity
of
the
environment
to
which
the
465
is
subjected
will
determine
the
frequency
of
maintenance.
A
convenient
time
to
perform
preventive
maintenance
is
just
prior
to
recalibration
of
the
instrument.
Cleaning
General.
The
465
should
be
cleaned
as
often
as
operating
conditions
require.
Accumulation
of
dirt
in
the
instrument
can cause
overheating
and
component
breakdown.
Dirt
on
®
components
acts
as
an insulating
blanket
and
prevents
efficient
heat
dissipation. It also provides an electrical
conduction
path
which can result
in
instrument
failure.
The
cabinet
provides
protection
against
dust
in
the
interior
of
the
instrument.
Operation
without
the
cabinet
in
place necessitates
more
frequent
cleaning.
The
front
cover
provides a measure
of
dust
protection
for
the
front
panel
and
the
CRT
face.
The
front
cover
should
be installed when
storing
or
transporting
the
instrument.
Avoid the use
of
chemical cleaning agents which
might
damage
the plastics used
in
this instrument.
Avoid chemicals which contain benzene, toluene,
xylene, acetone or similar solvents. Recommended
cleaning agents
are
isopropyl alcohol or Kelite
(1
part Kelite,
20
parts water).
Switch Contacts. Most
of
the
switching
in
the
465
is
accomplished
with
circuit-board
mounted,
cam-actuated
contacts.
Care
must
be
exercised
to
preserve
the
high-
frequency
characteristics
of
these
switches.
Seldom
is
switch
maintenance
necessary,
but
if
it
is
required,
observe
the
following
precautions.
Cleaning
the
switch
contacts
should
only
be
done
using isopropyl alcohol
or
a
solution
of
one
part
Kelite
to
20
parts
water.
In
the
absence
of
these
three
cleaners
it
is
safe
to
use
petroleum
ether,
white
kerosene,
or
a
solution
of
1%
Joy
detergent
and
99%
water.
Do
not
use
acetone,
MEK, MIBK,
benzol,
toluol,
carbon
tetrachloride,
Fig. 4-1. Removing wrap-around cabinet.
4-1
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