Heathkit HW-9 User Manual

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Page
1
5
A
GOOD
SOLDER
CONNECTION
Solder Flows
Outward
And
Gradually Blends
With The Foil
And The
Lead.
FOIL
Soldering
Iron
Positioned
Correctly
I
I
I
I
I
I
L
When
you heat
the lead and
the
circuit board
foil at the same
time, the
solder
will flow
evenly onto the
lead and the
foil. I
The
solder will
make a good
electrical connection
between
|
the lead
and the
foil.
POOR
SOLDER
CONNECTIONS
Solder Does Not
Flow
Onto
Lead. A Hard
Rosin
Bead Surrounds
And
Insulates
Connection.
FOIL
ROSIN
/\
4
'Soldering
*
Iron
Positioned
Incorrectly
Solder Appears To
Flow
Inward And Sit On
Top Of Foil.
FOIL
Soldering
Iron
Positioned
Incorrectly
ROSIN
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
small amount of additional solder
to obtain
a
good
connection.
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.
SOLDER
BRIDGES
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-
tions on
the
same
foil.
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
be-
tween
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
most circuit
boards
has a
coating
on it
called
"solder
resist/'
This
is a
protective
insulation
to help
prevent
solder
bridges.
A
SOLDER
BRIDGE

Heathkit HW-9 Specifications

General

Brand	Heathkit
Model	HW-9
Category	Transceiver
Language	English