Tektronix 7B10 Instruction Manual page 34

MAINTENANCE
Section
4
— 7B10
This section of
the
manual
contains information
for
performing
preventive maintenance, troubleshooting,
and
corrective
maintenance
for this
instrument.
PREVENTIVE
MAINTENANCE
Preventive
maintenance
consists
of
cleaning, visual inspection,
lubrication,
etc,
Preventive
maintenance performed on
a
regular basis
may
prevent instrument
breakdown and
will
improve
the
reliability of
the instrument.
The
severity of the
environment
to
which
this
instrument
is
subjected determines
the frequency
of
maintenance
A
convenient time
to
perform preventive
maintenance
is
preceding adjustment
of
the instrument.
CLEANING
This instrument should be cleaned
as often as operating
conditions require.
Accumulation
of
dirt
on components
acts as
an
insulating blanket
and
prevents
efficient
heat
dissipation
which can cause overheating and component
breakdown
'>
"
<
>
CAUTION
<
S
ii
y
.r-
^
y
y
Avoid
the
use
of
chemical
cleaning agents
which might
damage
the
plastics
used
in this
instrument.
Use
a
non-residue
type of
cleaner, preferably isopropyl alchohol,
totally
denatured
ethyl alchohol, or
Freon
TF.
Before
using
any
other type of
cleaner,
consult your
Tektronix
Service Center
or representative.
EXTERIOR
Loose dust
accumulated on
the
front
panel
can be
removed
with
a soft
cloth
or
small brush.
Dirt
that
remains can be removed
with a soft cloth
dampened
with
a
mild detergent
and water
solution.
Abrasive cleaners
should
not
be used.
WARNING
I
To
avoid
electric
shock, disconnect
the
instrument from
the
power
source
before
removing
protective panels.
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,
low-pressure
air.
Remove
any
dirt
which remains
with
a soft
brush
or a
cloth
dampened
with
a
mild detergent
and water
solution.
A
cotton tipped applicator
is
useful
for
cleaning
in
narrow
spaces.
SWITCH
CONTACTS
Switch contacts
and pads
are designed
to
operate
dry
for
the
life
of
the switch. However, as
the
switches
are not
sealed,
dust
attracted
to
the contact area
may
cause
switch contacts
to
become
electrically noisy.
Cleaning
may
be accomplished
by flushing the contact area with
isopropyl alcohol or kelite
(1
part
kelite to
20
parts water).
Do
not
use chemical cleaning agents
that leave a
film or
that
might
damage
plastic parts.
Do
not use cotton
swabs
or similar applicators
to
apply cleaning agents, as they
tend
to
snag and
leave strands
of
cotton on switch
contacts.
Should
it
become
necessary
to
remove
a
switch
for
replacement
or
cleaning,
refer to
Component
Removal
and Replacement
in this
section.
VISUAL INSPECTION
This
instrument should be inspected
occasionally
for
such defects as broken connections, improperly seated
semiconductors,
damaged
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
Generally, there are no components
in
this
instrument
that require a regular lubrication
program
during the
life
of
the instrument
4-1