which
will
be
tinned.
This
prevents
solder
from building
up
on
rough
spots
where
it
will
quickly oxidize.
When
removing
or
replacing
components
mounted
on
the
ceramic
strips
you
will
find
that
satisfactory
results
are
obtained
if
you
proceed
in
the
manner
outlined
below.
1. Use
a
soldering
iron
of
about
75
-watt
rating.
2. Prepare
the
tip of
the
iron
as
shown
in
Fig.
4-1.
3. Tin
only
the
first
1/16
to
1/8
inch of
the
tip.
For
soldering
to
ceramic
terminal
strips
tin
the
iron
with
solder
containing
about
3% silver.
4.
Apply
one
corner
of
the
tip
to
the
notch
where you
wish
to
solder
(see
Fig.
4-2).
along
the
wire so
that
a
slight
fillet
will be
formed
as
shown in
Fig. 4-4.
Fig.
4-3.
A
slight
fillet
of
solder
is formed
around
the
wire
when
heat
is
applied
correctly.
Fig. 4-2.
Correct method
of
applying
heat
in
soldering
to
a
ceramic
strip.
5.
Apply
only
enough
heat
to
make
the
solder
flow
freely.
6.
Do
not
attempt
to fill the
notch
on
the
strip
with
solder;
instead,
apply
only enough
solder
to
cover
the
wires
adequately,
and
to
form
a
slight
fillet on
the
wire
as
shown
in
Fig.
4-3.
In
soldering
to metal terminals
(for
example,
pins
on
a
tube
socket)
a
slightly
different
technique
should
be
employed.
Prepare
the iron
as
outlined
above,
but
tin
with
ordinary
tin-
lead
solder.
Apply
the
iron
to
the
parts
to
be
soldered
as
shown
in
Fig.
4-4.
Use only
enough heat
to
allow
the
solder
to flow
freely
General Soldering
Considerations
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.
4-4.
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
AA
Maintenance
- Type
515/515A
4-3
