Step-By-Step Assembly; Assembly Notes; Safety Warning - Heathkit HD-1250 Manual

Page 13
STEP-BY-STEP
ASSEMBLY
ASSEMBLY NOTES
1
.
Before you
start to
assemble
this
kit,
review the
wiring,
and
soldering
information
in
the "Kit Builders
Guide." Also be
sure
to
read
each
step
all
the
way
through before performing
that step.
2.
Due
to the small
foil area
around
some
circuit
board
holes
and
the small
areas
between
foils,
you must
use the
utmost
care to prevent solder bridges
between
adjacent
foil areas.
Use only
a
minimum
amount
of solder
and do
not heat
components
excessively
with
the soldering iron.
It is
also
very
important that
you keep your
soldering iron
tip clean
and
well tinned.
Diodes, transistors,
etc.,
can be
damaged
if
subjected to an excessive
amount
of heat.
3.
Resistors
will
be
called
out by
their resistance
value
in
n
or kJ2 (kilohms)
and
color code.
4.
Capacitors
will
be
called
out by
their capacitance value
(in
pF
or
/jF)
and
type
(disc,
mica, or ceramic).
5.
Because the
oscillator circuit
board
is
small
and has
a
tendency
to
move
when
being soldered,
it is
a
good
idea to hold
it
in
some manner.
A
simple
jig
made
up of
a
small
board and
a
pincher
clothspin, as
shown
in
Figure
A,
works
very well for this purpose.
A
small vise
can
also be
used.
BOARD
Figure
A
SAFETY WARNING:
Avoid
eye injury
when you
cut
off excess
leads.
Hold
the
leads so
they cannot
fly
toward your
eyes.