Maintenance-2445A/2455A Service
~
To
prevent damage from electrical arcing, ensure
that circuit boards and components are dry before
applying power to the instrument.
CLEANING.
To
clean
the interior, blow off dust with
dry, low-pressure air (approximately 9
psi).
Remove
any
remaining dust with a soft brush or a cloth dampened with
a solution of mild detergent
and
water. A cotton-tipped
applicator
is
useful for cleaning
in
narrow spaces
and
on
circuit boards.
If these methods do not remove
all
the dust or dirt,
the
instrument
may
be
spray washed using a solution of
5%
mild
detergent
and
95%
water
as
follows:
6-4
Exceptions to the following procedure are
the
Attenuator assemblies.
Clean
these
assemblies only
with isopropyl alcohol
as
described in step
4.
1.
Gain
access to the parts to
be
cleaned
by
removing easily accessible shields
and
panels.
2.
Spray-wash dirty parts with the detergent-and-
water solution, then
use
clean
water to
thoroughly rinse them.
3.
Dry
all
parts with low-pressure
air.
NOTE
Most
of
the switches used
in
the
instru-
ment are sealed and
the
contacts are inac-
cessible.
If
cleaning is deemed necessary,
use
only isopropyl alcohol.
4.
Clean
switches with isopropyl alcohol
and
wait
60
seconds for the majority of the alcohol to
evaporate.
Then
complete drying with low-
pressure
air.
5.
Dry
all
components
and
assemblies
in
an
oven or
drying compartment using low-temperature
(125°F to 150°F) circulating
air.
LUBRICATION
There
is
no
periodic lubrication required for this
instrument.
SEMICONDUCTOR CHECKS
Periodic checks of the transistors
and
other semicon-
ductors
in
the oscilloscope are not recommended.
The
best check of semiconductor performance
is
actual
operation
in
the instrument.
PERIODIC READJUSTMENT
To
ensure accurate measurements, check the perfor-
mance
of this instrument every 2000 hours of operation, or
if
used
infrequently, once
each
year.
In
addition, replace-
ment of components may necessitate readjustment of the
affected circuits.
Complete Performance Check
and
Adjustment instruc-
tions are given
in
Sections 4
and
5.
The
Performance
Check
Procedure
can
also
be
helpful
in
localizing certain
troubles
in
the instrument.
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