Visual Inspection; Lubrication; Semiconductor Checks; Readjustment - Tektronix 465B Instruction Manual

Maintenance
—
465B
Service
denatured alcohol or a mild detergent
and water
solution
The
optional
crt
mesh
filter
can be cleaned inthefollowing
manner:
1.
Hold
the
filter in
a vertical
position
and brush
lightly
with
a
Number
7 soft
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-pressureair
(approximately 9
pounds
per square inch) to
remove
it.
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.
AIR FILTER.
The
air filter
should be
visually
checked
every
few weeks and
cleaned
or
replaced
if
dirty.
More
frequent inspections are required under
severe operating
conditions.
The
following procedure
is
suggested for
cleaning the
filter.
If
the
filter is
to
be replaced, order
new
air
filters
from your
local
Tektronix
Field
Office or
representative.
Refer
to
the Replaceable Mechanical
Parts
List for
ordering
information.
1.
Remove
the
filter
by pulling
it
out
of
the retaining
frame on the
rear panel.
Be
careful not to
drop any
of
the
accumulated
dirt into
the instrument.
2.
Flush the loose
dirt
from
the
filter
with a stream
of
hot water.
3.
Place the
filter in
a solution
of
mild detergent
and
hot
water
and
let
it
soak
for several
minutes.
4.
Squeeze
the
filter
to
wash
out
any
remaining
dirt.
5.
Rinse
the
filter
in
clear
water and
allow
it
to
dry.
6.
Coat the dry
filter
with
an
air-filter
adhesive
(available
from
an
air
conditioner
supplier,
or see
Maintenance
Aids information
at
the
end
of this section).
7
Let
the adhesive dry thoroughly
8.
Re-install
the
filter
in
the retaining frame.
Visual Inspection
The instrument should be inspected
occasionally for
such
defects as broken connections, broken
or
damaged
ceramic
strips,
improperly
seated
semiconductors,
damaged
or
improperly
installed 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
The
fan
motor and most
of
the potentiometers used
in
the 465
B
are
permanently sealed and
generally
do
not
require periodic
lubrication.
The
switches
used
in
the
465B, both
cam- and
lever-type,
are
installed
with proper
lubrication applied
where
necessary
and
will
rarely
re-
quire
any
additional lubrication.
A
regular periodic
lubrication
program
for
the
465B
is
not
recommended.
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.
Readjustment
To ensure accurate measurements, check
the
adjust-
ment
of this
instrument
after
each 1000 hours
of
operation
or,
if
used infrequently, every
six
months.
In
addition,
replacement
of
components
may
necessitate readjust-
ment
of
the
affected
circuits.
The
adjustment procedure
can
also
be
helpful
in
localizing certain troubles
in
the
instrument.
In
some
cases,
minor
troubles
may
be
revealed
and/or
corrected
by readjustment.
Complete
adjustment instructions are given
in
the Calibration
Procedure section.
If
only a
partial
adjustment
is
per-
formed, see the
interaction
chart,
Table
4-6, for
possible
interactions with
circuits
not adjusted.