Tektronix 570, Manual

Page: 39 / 134

General Soldering Consideration
When replacing wires in terminal slots clip
the ends neatly as close to the solder joint
as possible.
In clipping the ends of wires
take care the end removed does not fly across
the room as it is clipped.
Fig.
4-5.
A
s
ol
d
er
in
g
aid constructed
from a
1/4 inch
wooden dowel .
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
to use some form of
I I heat sink" to avoid
melting the plastic. A pair of long-nosed
pliers (see Fig. 4-6) makes a convenient tool
for this purpose.
Fig.
4-6.
Soldering to a terminal mounted i n plastiC. Note
the
use
of
the long-nosed pliers
between the iron and the coil form to ab­
s o r b the heat .
C e r a m i c Strips
Two distinct types of ceramic strips have been
used in Tektronix instruments. The earlier
type mounted on the chassis by means of # 2 -
5 6 bolts and nuts. The later type i s mounted
with snap-in , plastic fittings . Both styles are
shown in Fig. 4-7 .
# 2-56
F I TT I N GS
F i g .
4-7.
Two types of ceramic strip mountings.
To replace ceramic strips which bolt to
the chassis , s c rew a # 2 - 5 6 nut into 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 chas sis. Insert the bolts through the
holes in the chassis where the original strip
was mounted, placing a # 2 star-washer between
each nut and the chassis. Place a second set
of #2 flat-washers on the protruding ends of
the bolts , and fasten them firmly with another
set of #2-56 nuts.
Mounting Later Ceramic Strips
To replace strips which mount with snap­
in plastic fittings , first remove the original
fittings from the chassis. Assemble the mount­
ing post on the ceramic strip_ Insert the nylon
collar into the mounting holes in the chassis_
AA
M aintenance - Type 570 4 - 3