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Maintenance and
Calibration
—
Type
114
3.
If
the
voltage
and
resistance measurements
taken
in
the
proceeding
steps
are normal,
use
an
oscilloscope
to
check
the
waveforms
at
the
points
shown
on
the
schematics
in
Section 5. Checking
the
waveforms
will
help
in
isolat
ing
the
trouble
to
a
particular
circuit.
Once
the
trouble
is
isolated
to
a
particular
circuit,
take
voltage
and
resistance
measurements
until
the
defective
component
is
identified.
Component
Identification.
The
circuit
number
of
each
electrical
part
is
shown
on
the
circuit
diagrams
in
Section
5.
Note
that
a
functional
group
of circuits (such
as
the
power
supply)
is
assigned
a
particular
series
of
numbers.
Switch
wafers
are
identified
by
counting
from
the
first
wafer
locat
ed
behind
the
detent
section
of
the
switch
towards
the
last
wafer.
The
letters
F
and
R
indicate
whether
the
front
or
rear
of
the
wafer is
used
to
perform
the
particular
switch
ing
function.
For
example,
the
designation
2R
printed
by
a
switch
section
on
a
schematic
identifies
the
switch
section
as being
on
the
rear side
of
the
second
wafer
when
counting
back
from
the
detent
section.
Parts Replacement.
Most
of
the
electronic
components
in
the
Type
114
are
standard
items
available
locally.
The
remainder
of
the
electronic
components
and
most
of
the
mechanical
parts are
manufactured
or
selected
by
Tek-
tronix
to
satisfy
particular
requirements,
or
are manufac
tured for
Tektronix
to
our
specifications.
However,
all
parts
are
obtainable
through
your
Tektronix
Field
Engineer
or
Field
Office.
Before
purchasing
or
ordering,
consult
the
Parts
List
(Section 5)
to
determine
the
value,
tolerance,
and
ratings
required.
See
“
Parts
Ordering
Information"
and
"Special
Notes
and
Symbols"
on
the first
page
of
Sec
tion
5.
When
selecting
the replacement
parts,
it
is
important
to
remember
that
the
physical
size
and
shape
of
a com
ponent may
affect its
performance in
the
circuit.
Parts
orientation
and
lead
dress
should
duplicate
those
of
the
original
part,
since
many
of
the
components
are
mounted
in
a
particular
way
to
reduce
or
control
stray
capacitance
and
inductance.
After
repair,
portions
of
the
instrument
may
require
recalibration.
Replacing
Components
on
Etched-Circuit
Boards.
Use
ordinary
electronic
grade
60/40 solder
and
a
35-
to
40-
watt
pencil soldering
iron
with
a
'/
8
"
wide
chisel tip.
The
tip
of
the
iron
should
be
clean
and
properly
tinned
for
best
heat
transfer in
a
short
time
to
a
soldered
connection. A
higher
wattage
soldering
iron,
if
used
and
applied
for
too
long
a
time,
ruins
the
bond
between
the etched
wiring
and
base
material by charring
the
glass
epoxy
laminate.
The
step-by-step
technique
is
as
follows:
1.
Remove
the
component
by
cutting
the
leads near
the
body.
This
frees
the
leads
for
individual
unsoldering.
2.
Grip
the
lead
with
needle-nose
pliers.
Apply
the
tinned
tip
of
a
40-watt
pencil
soldering
iron
to
the
lead
between
the
pliers
and
the
board;
then
pull
gently.
3.
When
the
solder first
begins
to
melt,
the
lead
will
come
out,
leaving
a
clean
hole.
If
the
hole is
not
clean,
use
the
soldering iron
and
a
toothpick
or
a
piece
of
enamel
wire
to
open
the
terminal
hole. Do
not
attempt
to
drill
the
solder
out
since
the
"through-hole"
plating
might
be
de
stroyed.
4.
Clean
the
leads
on
the
new
component
and
bend
them
to
the
correct
shape. Carefully
insert
the
leads
into
the holes
from
which
the
defective
component
was
removed.
5. Apply
the
iron
for
a
short
time
at
each
connection
on
the
side
of
the
board
opposite
the
component
to
properly
seat
the
component.
6.
Apply
the
iron
and
a little solder
to
the
connections
to
finish
the
solder
joint.
Calibration and
Verification
Recalibrate
the
Type
114
after
each
500
hours
of
opera
tion,
or every
six
months
if
used
intermittently.
It
may
also
be
necessary
to
recalibrate
certain
sections
of
the
instru
ment
when
transistors
or
other
components
are
replaced.
Before
recalibrating
the
instrument,
clean
it
as
previously
described.
Do
not
preset
the
internal
adjustments
as
a preliminary
to
recalibration.
Presetting
internal
adjustments makes
it
necessary
to
completely
recalibrate
the
instrument.
The
following
portion
of
this
manual
presents
a
step-by-
step
calibration
and
verification
procedure.
The
title
of
each
numbered
step
begins
either
with
"Adjust"
or
"Check",
thereby
identifying
the
step
function
as
calibra
tion
or
verification.
The
steps are identified in this
manner
because
any
or
all
groups
of
numbered
"Checks"
can
be
skipped
without
disrupting
the
continuity
of
the procedure.
However,
all
adjustments must
be
completed
in
the
order
given
and
none should
be
skipped.
Remember
that
proper
overall operation
is
ensured
only
when
all
steps
in
the
pro
cedure
have
been
completed
and all
adjustments
have
been
made
as
accurately as
possible.
NOTE
The
performance
standards
described
in
this
sec
tion
of
the
manual
are
provided
strictly
as
guides
to
calibration
of
the Type
114
and
should
not
be
construed
as
advertised
performance
specifica
tions.
However,
if
the
Type
114
performs
within
the
guide
tolerances
given
in
the
calibration
pro
cedure,
it
will
also
perform
as
listed in
the
Char
acteristics
section
of
this
manual.
Equipment Required. (See Fig.
4-1.)
1.
Oscilloscope,
Tektronix
Type
547/1 Al
or
equivalent.
2.
Time
mark
generator,
Tektronix
Type
180A
or equiv
alent.
3.
Volt-Ohm-Milliammeter,
20,000
Ω
per
volt,
Simpson
Model
260
or equivalent.
4.
Three
50
Ω
coax
cables
with
BNC
connectors
(Tek
tronix
Part No. 012-057).
5.
50
Ω
BNC
termination (Tektronix
Part
No.
011-049).
6. Variable
line
voltage
source
such
as
a
variable
auto
transformer.
4-3
Summary of Contents for 114
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Page 8: ...Operating Instructions Type 114 Fig 2 1 Front panel control Fig 2 2 Type 114 rear ponel 2 2 ...
Page 10: ...NOTES ...
Page 14: ...NOTES ...
Page 28: ...Maintenance and Calibration Type 114 Fig 4 20 Locations of electrical components 4 14 ...
Page 30: ...Parts List Type 114 EXPLODED VIEW 5 2 ...
Page 45: ...TYPE 114 PULSE GENERATOR ...
Page 46: ...PULSE GENERATOR ...
Page 47: ...TYPE IM PULSE GENERATOR c ...
Page 48: ...SW282 POWER SUPPLY CMD OUTPUT AMPLIFIER 4 POWER SUPPLY ...