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Maintenance--7B87
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
and
Adjustment
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.
O)
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.
€1967-2
Figure 4-1. Lubrication procedure for a typical cam switch.
TROUBLESHOOTING
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
are
shown
on the diagrams.
Voltage
conditions
given
on the diagrams
page
indicate
the
test
equipment
used
and
the
front-panel
control
status
necessary
to obtain
the
given
voltages.
4-2
Typical
operating
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. Waveform Conditions given on the
diagram
page list the test equipment
used and the front-
panel
control
status
necessary
to
obtain
the
given
waveform.
CIRCUIT-BOARD
ILLUSTRATIONS
Circuit-board illustrations are shown on the foldout page
preceding
the
associated
diagram.
Each
board-mounted
electrical
component
is identified by its circuit number,
as are
interconnecting
wires
and
connectors.
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