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Tektronix 502A

Tektronix 502A
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Maintenance
—
Type
502A
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.
Fig.
4-2.
Correct
method
of
applying
heat
in
soldering
to
a
ceramic
strip.
4.
Apply
one
corner
of
the
tip
to
the
notch
where
you
wish
to
solder
(see
Fig.
4-2).
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.
Fig.
4-3.
A
slight
fillet
of
solder
is
formed
around
the
wire
when
heat
is
applied
correctly.
In
soldering
to
metal
terminals
(for
example,
pins
on
a
tube
socket)
a
slightly
different
technique
should
be
em
ployed.
Prepare
the
iron
as
outlined
above,
but
tin
with
ordinary
tin-lead
solder.
Apply
the
iron
to
the
part
to
be
soldered
as
shown
in
Fig.
4-4.
Use
only
enough
heat
to
allow
the
solder
to
flow
freely
along
the
wire
so
that
a
slight
fillet
will
be
formed.
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
the
ends
of
wires
take
care
the
end
removed
does
not
fly
across
the
room
as
it
is
clipped.
Fig.
4-5.
A
soldering
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
ends
shaped
as
shown
in
Fig.
4-5.
In
soldering
to
terminal
pins
mounted
in
plastic
rods
it
is
necessary
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
To
replace
strips
which
mount
with
snap-in
plastic
fit
tings,
first
remove
the
original
fittings
from
the
chassis.
Assemble
the
mounting
posts
on
the
ceramic
strip.
Insert
the
nylon
collar
into
the
mounting
holes
in
the
chassis.
Carefully
force
the
mounting
post
into
the
nylon
collars.
Snip
off
the
portion
of
the
mounting
post
which
protrudes
below
the
nylon
collar
on
the
reverse
side
of
the
chassis.
4-2

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