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Maintenance—
7B10
CAM
SWITCH LUBRICATION
In
most
cases, factory lubrication
should be adequate
for
the
life
of
the instrument.
However,
if
the switch
has
been disassembled
for
replacement
of
switch
sub-parts,
a
lubrication
kit
containing the necessary
lubricating
materials
and
instructions
is
available
through
any
Tektronix
Field Office.
Order
Tektronix
Part
003-0342-01
.
General
Electric
Versilube
silicone
grease should be
applied sparingly
so
that
the
lubricant
does
not get
on
the
contacts.
Refer
to
Figure 4-1
for
lubrication instructions.
SEMICONDUCTOR CHECKS
Periodic
checks
of
the
semiconductors
in
this
instrument
are not
recommended. The
best
check
of
semiconductor
performance
is
actual
operation
in
the instrument.
More
details
on
checking semiconductor
operation are given
under
Troubleshooting.
ADJUSTMENT
AFTER REPAIR
After
any
electrical
component
has been
replaced,
the
adjustment
of
that particular
circuit
should be checked,
as well as the
adjustment
of
other
closely related
circuits.
The
Performance
Check
procedure
in
this
manual
provides a
quick
and
convenient
means
of
checking
instrument
operation.
In
some
cases,
minor
troubles
may
be
revealed
or
corrected by adjustment.
TROUBLESHOOTING
1
©
Apply
lubricant
to
the
drum
journals
and
mating
surface
in
the
mounting
bearings.
Apply
lubricant
to
the
wear
surface
of
the
index wheel.
®
Apply
lubricant to the
index
roller
and
roller
guide
in
the front bearing.
A
thin film
should
be
applied
to
the
inner
face
of
the
detent
springs
if
more
than
one
spring
is
replaced.
®
Ensure
that
some
lubricant
is
present
at
the
interface
between
the bearing
and
retainer
clip.
Fig.
4-1. Lubrication
procedure
for a typical
cam
switch.
The
following information
is
provided
to
help troubleshoot
this
instrument. Information contained
in
other sections
of
this
manual
should be used along with
the following information
to
aid
in
locating
the defective
component.
An
understanding
of
the
circuit
operation
is
very helpful
in
locating troubles, particularly
where
integrated
circuits
are
used
TROUBLESHOOTING
AIDS
DIAGRAMS
Circuit
diagrams
are given
on
foldout
pages
in
section
8.
The component number
and
electrical
value
of
each
component
in
this
instrument
is
shown
on
the
diagrams.
Components
that
are
mounted
on
circuit
boards are
outlined
on
the
diagrams
with
a
heavy
black
line.
VOLTAGES
AND WAVEFORMS
Typical
operating voltages
and waveforms
are
shown
next
to
the
diagram
where
they
were
measured. Each
waveform
is
numbered
to locate
on
the
diagram
the point
where
the
waveform
was
taken Voltages
and waveform
conditions
given
on
the
diagram page
list
the
test
equipment
used
and
the
front-panel
control
status
necessary
to
obtain the given
waveform.
TROUBLESHOOTING CHART
The
Troubleshooting Chart
in
section
8
is
useful
for
locating a
fault
in
the
absence
or
presence
of
specific
symptoms.
Refer
to
the
chart, circuit description,
and
circuit
diagrams
when
troubleshooting the instrument.
4-2
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