Heathkit SB-1000 - Page 18

Page 18
Heathkit
STEP-BY-STEP
ASSEMBLY
Refer
to
Pictorial
2-1
while
you
perform
the
following
steps.
NOTE:
You
will
install
most
of
the
parts
on
the
foil
side
of
this
circuit
board.
For
this
reason,
the
out-
lines
of
the
parts
are
printed
on
the
foil
side.
(Position
the
circuit
board
as
shown
in
the
Pictorial.
Section 1
()
R404:
1
MQ,
2-watt,
1%
resistor
(may
be
marked
1M
or
have
bm-blk-
grn
color
bands).
()
R403:
1
MQ,
2-watt,
1%
resistor
(may
be
marked
IM
or
have
brr-blk-
grn
color
bands).
Install
a
50
kQ,
7-
or
10-watt
resistor
at
each
of
the
following
four
locations.
NOTE:
Be
sure
to
position
cach
resistor
so
its
body
is
1/4"
above
the
circuit
board
as
shown.
If
the
resistor
body
is
longer
than
the
circuit
board
hole
spacing,
form
the
leads
under
the
body
to
fit.
7.WATT 1O-WATT
—(rZ 4
1a"
_
QO R413.
() R412.
QQ R4l.
() R409.
()
Solder
the
leads
to
the
foil
and
cut
off
the
excess lead lengths.
Section 2
()
R402:
1.5
MQ,
2-watt,
1%
(brn-grn-grn)
resistor.
Mount
this
resistor
down
against
the
circuit
board.
()
R401:
47
kQ,
1/2-watt
(yel-viol-org)
resistor.
Mount
this
resistor
down
against
the
circuit
board.
Install
a
50
kQ,
7-
or
10-watt
resistor
at
each
of
the
following
four
locations.
NOTE:
Be
sure
to
position
each
resistor
so
its
body
is
1/4"
above
the
circuit
board.
() R408.
Q R407.
QO R406.
OQ R405.
NOTE:
Mount
the
next
four
components
down
against
the
circuit
board.
()
D401:
1N5408
(#230-6776)
diode.
Be
sure
to
match
the
band
on
the
diode
with
the
outline
of
the
band
on
the
circuit
board.
©
LA01:
Choke
(#230-6781).
©
C409:
.01
uF
(103)
axial-lead
ceramic
capacitor.
()
C411:.01
pF
(103)
axial-lead
ceramic
capacitor.
()
Solder
the
leads
to
the
foil
and
cut
off
the
ex-
cess
lead
lengths.
Refer
to
Pictorial
2-2
while
you
perform
the
following
steps.
NOTES:
1.
You
will
mount
the
following
electrolytic
capacitors
on
the
plain
side
of
the
circuit
board.
The
outlines
of
these
capacitors
are
shown
in
dashed
lines
on
the
foil
side
of
the
board.
2.
Be
sure
you
install
each
capacitor
correctly.
Once
the
capacitor
is
installed,
it
is
difficult
to
check
your
work.
()
(C407:
Locate
one
of
the
210
pF
electrolytic
capacitors.
Note
that
there
is
a
positive
(+)
mark
near
one
of
its
terminals.
Be
sure
to
position
the
capacitor
so
this
positive
(+)
terminal
is
connected
to
the
positive
(+)
marked
circuit
board
foil
as
shown
in
Detail
2-
2A.
Use
two
10-32
x
3/8"
screws
and
two
#10
lockwashers
to
mount
the
capacitor
onto
the
plain
side
of
the
circuit
board
at
C407.