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Tektronix 585 - Page 49

Tektronix 585
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Maintenance
—
Type
585
General
Soldering
Considerations
When
replacing
wires
in
ceramic
terminal
strip
notches,
clip
the
ends
neatly
as
close
to
the
solder
joint
as
possible.
In
clipping
the
end
of
wires,
take
care
the
end
removed
does
not
stay
within
the
oscilloscope
and
cause
a
short
circuit.
Fig.
5*5.
Soldering
to
a
terminal.
Note
the
slight
fillet
of
solder
—
exaggerated
for
clarity
—
formed
around
the
wire.
Occasionally
you
will
wish
to
hold
a
bare
wire
in
place
as
it
is
being
soldered.
A
handy
device
for
this
purpose
is
a
short
length
of
wooden
dowel,
with
one
end
shaped
as
shown
in
Fig.
5-6.
In
soldering
to
terminal
pins
mounted
in
plastic
rods
or
coil
forms
it
is
necessary
to
use
some
form
of
“
heat
sink
”
to
avoid
melting
the
plastic.
A
pair
of
long-
nosed
pliers
(see
Fig.
5-7)
makes
a
convenient
tool
for
this
purpose.
Fig.
5-6.
A
soldering
aid
constructed
from
a
¼
inch
wooden
dowel.
Ceramic
Strips
Two
distinct
types
of
ceramic
strips
have
been
used
in
Tektronix
instruments.
The
earlier
type
is
mounted
on
the
chassis
by
means
of
#2-56
bolts
and
nuts.
The
later
type
is
mounted
with
snap-in,
plastic
fittings.
Both
styles
are
shown
in
Fig.
5-8.
To
replace
ceramic
strips
which
bolt
to
the
chassis,
screw
a
#2-56
nut
onto
each
mounting
bolt,
positioning
the
bolt
so
that
the
distance
between
the
bottom
of
the
bolt
and
the
bottom
of
the
ceramic
strip
equals
the
height
at
which
you
wish
to
mount
the
strip
above
the
chassis.
Secure
the
nuts
to
the
bolts
with
a
drop
of
red
lacquer
or
glyptal.
Insert
the
bolts
through
the
holes
in
the
chassis
where
the
original
strip
was
mounted,
placing
a
#2
starwasher
between
each
nut
and
the
chassis.
Place
a
set
of
#2
flatwashers
on
the
protruding
ends
of
the
bolts,
and
fasten
them
firmly
with
another
set
of
#2-56
nuts.
Place
a
drop
of
red
lacquer
or
glyptal
over
each
of
the
second
set
of
nuts
after
fasten
ing.
Fig.
5-7.
Soldering
to
a
terminal
mounted
in
plastic.
Note
the
use
of
the
long-nosed
pliers
between
the
iron
and
the
coil
form
to
absorb
the
heat.
To
replace
strips
which
mount
with
snap-in
plastic
mount
ings,
first
remove
the
original
fittings
from
the
chassis
by
simply
pulling
them
directly
away
from
the
chassis.
Assemble
the
mounting
yoke
on
the
ceramic
strip.
(It
may
be
already
mounted.)
Insert
the
spacer
into
the
mounting
holes
in
the
chassis.
Carefully
force
the
yoke
pin
into
the
spacer.
Snip
off
the
portion
of
the
yoke
pin
which
protrudes
below
the
nylon
collar
on
the
reverse
side
of
the
chassis.
NOTE
Considerable
force
may
be
necessary
to
push
the
yoke
pins
into
the
nylon
collars.
Be
sure
that
you
apply
this
force
to
the
portion
of
the
ceramic
strip
directly
above
the
plastic
mounting
yoke.
Take
care
not
to
spread
the
yoke,
or
the
strip
may
be
loose
after
installation.
REMOVAL
AND
REPLACEMENT
OF
PARTS
General
Information
Instructions
for
the
removal
of
certain
parts
are
contained
in
the
following
paragraphs.
Because
of
the
nature
of
the
5-3

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