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Maintenance-465
trichlor,
trichlene,
methyl
alcohol, methylene chloride,
sulfuric acid,
or
Freon TC-TE-TF-22-TA-12.
Most spray
circuit
coolants and contact cleaners contain
Freon 12
as
a propellant.
Because
many Freons adversely
affect the contacts, check the contents before using a spray
cleaner
or
coolant.
An
acceptable contact cleaner-restorer
is
No
Noise (Electronic Chemical). The
only
recommended
circuit
coolants
are
dry
ice or isopropyl alcohol. There
are
three recommended switch lubricants.
They
are
Silicone
Versilube (General Electric Co.),
Rykon
R (Standard
Oil,
and
WD-40 (Rocket Chemical Co.).
Exterior. Loose dust accumulated on the outside
of
the
465
can
be
removed
with
a
soft
cloth or small paint brush.
The
paint
brush
is
particularly
useful
for
dislodging
dirt
on
and
around the front-panel controls.
Dirt
which remains
can
be
removed
with
a
soft
cloth dampened in a
mild
detergent and water solution. Abrasive cleaners should
not
be
used.
CRT.
Clean the blue
and
clear plastic
light
filters
and
the
CRT face
with
a soft, lint-free cloth dampened
with
denatured alcohol or a
mild
detergent and water solution.
The optional CRT
mesh
filter
can
be
cleaned in the
following
manner.
1.
Hold the
filter
in a vertical position and brush
lightly
with
a soft No. 7 watercolor brush
to
remove
light
coatings
of
dust and
lint.
2.
Greasy residues or dried-on
dirt
can
be
removed
with
a solution
of
warm water and a neutral pH
liquid
detergent.
Use
the brush
to
lightly
scrub the
filter.
3. Rinse the
filter
thoroughly
in clean water and allow
to
air
dry.
4.
If
any
lint
or
dirt
remains,
use
clean low-pressure air
to
remove. Do
not
use
tweezers or other hard cleaning tools
on the
filter
as
the special finish may
be
damaged.
5. When
not
in
use,
store
the
mesh
filter
in a lint-free
dust-proof container such
as
a plastic bag.
Interior. 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,
4-2
low-pressure air. Remove any
dirt
that
remains
with
a soft
paint brush or a cloth dampened
with
a
mild
detergent
and
•
water solution. A
cotton-tipped
applicator
is
useful
for
,
cleaning in narrow
spaces
or
for
cleaning
circuit
boards. ·
Lubrication
The fan
motor
and
most
of
the potentiometers
used
in
the 465
are
permanently
sealed
and
generally do
not
require periodic lubrication. The switches
used
in the 465,
both cam- and lever-type,
are
installed
with
proper lubrica-
tion
applied where necessary and
will
only
rarely require
any additional lubrication.
It
is
recommended
that
a regular
periodic lubrication program
not
be
performed
on
any
of
the components
used
in the 465.
Transistor Checks
Periodic checks
of
the transistors
and
other
sem
icon-
ductors in the
465
are
not
recommended. The best check
of
semiconductor performance
is
actual operation in the
instrument.
Recalibration
To
assure
accurate measurements, check the calibration
of
this instrument after
each
1000 hours
of
operation or
every six months
if
used
infrequently.
In addition, replace-
ment
of
components may necessitate recalibration
of
the
affected circuits. Complete calibration instructions
are
given in the Calibration section.
The calibration procedure
can
also
be
helpful in
localizing certain troubles in the instrument.
In
some
cases,
minor
troubles may
be
revealed
or
corrected by
re-
calibration.
CORRECTIVE
MAINTENANCE
General
Corrective maintenance consists
of
component replace-
ment
and
instrument repair. Special techniques required
to
replace components in this
instrument
are
given here.
Obtaining Replacement Parts
Standard Parts.
All
electrical and mechanical part
re-
placements
for
the 465
can
be
obtained through your local
TEKTRONIX
Field
Office
or representative. However,
I
many
of
the standard electronic components
can
be
~:."
obtained locally in
less
time
than
is
required
to
order them
®
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