Heathkit IB-5281 - Page 12

Page 10
A GOOD SOLDER CONNEC
| SOLDER FLOWS OUTWARD
AND GRADUALLY BLENDS
| WITH THE FOIL AND
. THE LEAD.
| /
FOIL g
i
i
; .
oe Yo |
YO oe !
1/2 SOLDERING
7 TRON |
c7 POSITIONED
CORRECTLY '
I
When
you
heat
the
lead
and
the
circuit
board
foil
at
the
same
I
|
time,
the
solder
will
flow
evenly
onto
the
lead
and
the
foil.
|
The
solder
will
make
a
good
electrical
connection
between
|
the lead and the foil.
hit
|
POOR SOLDER CONNECTIONS
—_——_——_—F_—e
TS
TSS
SS
ee
ee
es
es ee
ee
ee
ee
es
es
ee
es
es
ee
ee
SOLDER
DOES
NOT
FLOW
and
ONTO
LEAD.
A
DARK
ROSIN
’
“SS”
SOLDERING
BEAD
SURROUNDS
AND
iN-
a
a
SOLDER
APPEARS
TO
FLOW
4/7
~~
1
RON
SULATES
THE
LEAD
FROM
ROSIN
“4S
7
INWARD
AND
SET
ON
TOP
aa
POSITIONED
THE
CONNECTION,
NO
Qf
77,"
SOLDERING
OF
THE
FOUL,
|
\
40°
INCORRECTLY
vr,
~
IRON
a
far
FOIL
rie
POSITIONED
FOIL
\
A
feet
INCORRECTLY
Ja
ROSIN
I|
When
the
lead
is
not
heated
sufficiently,
the
solder
will
not
flow
onto
the
lead
as
shown
above.
To
cor-
rect,
reheat
the
connection
and,
if
necessary,
apply
a
smaij
amount
of
additional
solder
to
obtain
a
good
L_connection.
SOLDER
A solder bridge between two adjacent foils is shown
in
photograph
A.
Photograph
B
shows
how
the
con-
nection
should
appear.
A
solder
bridge
may
occur
if
you accidentally touch an adjacent previously sol-
dered
connection,
if
you
use
too
much
solder,
or
if
you “drag”’ the soldering iron across other foils as you
remove it from the connection. A good rule to follow
is; always take a good look at the foil area around each
lead
before
you
solder
it.
Then,
when
you
solder
the
connection,
make
sure
the
solder
remains
in
this
area
and does not bridge to another foil. This is especially
important when the foils are small and close together.
NOTE:
It
is
alright
for
solder
to
bridge
two
connec-
1 ” ao eamea fail
tions on the Same rois.
Use only enough solder to make a good connection,
and lift the soldering iron straight up from the circuit
board.
If
a
solder
bridge
should
develop,
turn
the
circuit
board
foil-side-down
and
heat
the
solder
bet-
ween connections. The excess solder will run onto
the
tip
of
the
soldering
iron,
and
this
will
remove
the
solder bridge. NOTE: The foil side of the circuit board
has a Coating on it called “solder resist.’ This is a
protective insulation to help prevent solder bridges.
WS | SSSSSSSSSSSS
When
the
foil
is
not
heated
sufficiently
the
solder
will
blob
on
the
circuit
board
as
shown
above.
To
correct,
reheat
the
connection
and,
if
necessary,
apply
a
small
amount
of
additional
solder
to
obtain
a
good
connec-
tion.