Fig.
4-4. Soldering to a terminal. Note the slight fillet of solder--
exaggerated
for clarity--formed around the wire.
General
Soldering
Considerations
When
replacing wires in terminal slots clip
the ends
neatly
as
close to the solder
joint as
possible.
In
clipping ends or wires take care
the
end removed does not fly across the room
as
it
is
clipped.
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. 4-5. In soldering
to terminal
pins mounted in
plastic rods it is necessary
Fig. 4-5. A soldering aid constructed
from a 1/4 inch wooden dowel.
to use some
form of
" heat sink" to avoid
melting the
plastic.
A pair of long-nosed pliers
(see
Fig.
4-6) makes a convenient
tool for this
purpose.
Ceramic
Strips
Two
distinct types of ceramic strips
have
been
used
in Tektronix instruments. The earlier
type 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. 4-7.
To
replace ceramic strips
which bolt
to the
chassis, screw a
#2-56 nut
onto each mounting
bolt,
positioning the nut
so that the distance
between
the
bottom
of the
nut 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 glyptal. Insert the bolts through
the
holes in the chassis
where the original
SOLDERING
IRON
LONG
NOSED
PLIERS
PLASTIC COIL
FORM
Fig.
4-6. 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.
strip
was
mounted,
placing a #2 starwasher
between each nut
and the chassis. Place a
second
set
of #2
flatwashers on the protruding
Fig.
4-7. Two types of ceramic strip mountings.
AA
Maintenance
-
Type CA
4-3
