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Heathkit SB-1000 - Circuit Board Checkout

Heathkit SB-1000
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Heathkit
Refer
to
Pictorial
1-2
while
you
perform
the
follow-
ing
steps.
Section
1
NOTE:
In
the
next
step,
you
will
install
a
disk-type
ceramic
capacitor.
When
you
install
this
type
of
capacitor,
do
not
push
the
insulated
portion
of
the
leads
into
the
circuit
board
holes.
This
could
make
it
difficulty
to
solder
the
leads
to
the
foil.
INSULATION
~
‘\
inSULATION
Install
a
.01
pF
ceramic
capacitor
at
each
of
the
following
five
locations:
Q
Ct
Q)
C309.
Q
©308.
Q
G07.
OQ
306.
()
Solder
the
leads
to
the
foil
and
cut
off
the
ex-
cess
lead
lengths.
Section
2
Install
a
.01
uF
ceramic
capacitor
at
each
of
the
following
five
locations:
Q
C301.
()
©302.
Q)
C303.
()
304.
Q)
C305.
()
Solder
the
leads
to
the
foil
and
cut
off
the
ex-
cess
lead
lengths.
oN
my
KI
onches)
2
3
Page
15
Refer
to
Pictorial
1-3
while
you
perform
the
follow-
ing
steps.
©
Reposition
the
circuit
board
foil-side-up
as
shown
in
the
Pictorial.
NOTE:
When
you
are
instructed
to
prepare
a
wire,
as
in
the
following
step,
cut
it
to
the
indicated
length
and
remove
1/4"
of
insulation
from
each
end.
If
the
wire
is
stranded,
twist
the
fine
wire
strands
tightly
together
and
apply
a
small
amount
a
solder
to
hold
the
strands
together.
()
Prepare
a
2-3/4"
large
red
stranded
wire
and
a
7"
medium
black
stranded
wire.
()
Push
one
end
of
the
2-3/4”
large
red
stranded
wire
into
hole
C
on
the
foil
side
of
the
circuit
board
(the
hole
is
labeled
on
the
other
side
of
the
board).
Position
the
wire
so
the
insulation
is
1/8"
above
the
foil
as
shown
in
the
inset
drawing
on
the
Pictorial.
Then
solder
the
wire
to
the
foil.
The
other
end
of
this
wire
will
be
connected
later.
Cut
off
any
excess
wire
end
from
the
other
side
of
the
circuit
board.
Similarly,
solder
one
end
of
the
7"
medium
black
stranded
wire
to
hole
A
on
the
foil
side
of
the
circuit
board.
The
other
end
of
this
wire
will
be
connected
later.
CIRCUIT
BOARD
CHECKOUT
Carefully
inspect
the
foil
side
of
the
circuit
board
for
the
following
most-commonly-made
errors:
()
Unsoldered
connections.
©
Poor
solder
connections.
()
Protruding
leads
which
could
touch
together.
()
Check
each
diode
to
make
sure
it
is
properly
in-
stalled.
This
completes
the
assembly
of
the
rectifier
circuit
board.
Set
it
aside
until
itis
called
for
ina
step.
4
5
6
%
A
%
wa)
any
se)
7a
OB
+
ccm
a
a
«
5 s ?
e
2
1
"
2
9
“
3

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