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Heathkit SB-1000 - Page 43

Heathkit SB-1000
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Heathkit
{
RFC3:
Refer
to
Detail
6-10B
and
use
the
following
procedure
to
mount
the
plate
choke
to
the
main
chassis:
1.
Locate
the
end
of
the
coil
wire
at
the
bottom
end
of
the
choke.
Then
solder
the
wire
to
its
lug.
Locate
the
end
of
the
coil
wire
at
the
top
end
of
the
choke.
Then
solder
the
wire
to
its
lug.
Use
a
1/4-20
x
1/2”
screw,
a
small
control
lockwasher,
and
a
nylon
flat
washer
to
mount
the
choke
to
the
main
chassis
at
RFC3.
Be
sure
to
position
the
choke
as
shown
in
the
Pictorial
before
you
tighten
the
hardware.
Do
not
overtighten
this
hardware.
Refer
to
Pictorial
6-11
while
you
perform
the
following
steps.
a
Position
the
main
chassis
assembly
as
shownin
the
Pictorial.
Ww
Connect
the
free
end
of
the
black
wire
coming
from
the
input
filter
assembly
to
the
solder
lug
on
the
top
vernier
drive
(S-1).
“
Route
the
free
end
of
the
shorter
coaxial
cable
coming
from
the
input
filter
assembly
through
the
cutout
in
the
upper
front
corner
of
the
center
panel
assembly.
It
will
be
connected
later.
Y
Route
the
free
end
of
the
longer
coaxial
cable
coming
from
the
input
filter
assembly
through
the
cutoutin
the
upper
front
corner
of
the
center
panel
assembly
and
back
through
the
cutout
in
the
bottom
of
the
center
panel.
Then
route
the
free
end
of
the
cable
under
filament
choke
RFC2
and
connect
the
end
to
terminal
strip
BF
as
follows:
Inner
wire
to
lug
4
(S-1).
NOTE:
Other
leads
were
previously
soldered
to
the
eyelet
of
this
lug.
i
re
wires
to
lug
2
(S-1).
oe
Refer
to
inset
drawing
#1
on
the
Pictorial
and
connect
the
free
end
of
the
large
bare
wire
coming
from
switch
SW1D
lug
1
to
solder
lug
CJ
($-1).
{
Refer
to
Detail
6-11A
and
prepare
a
26"
length
of
large
coaxial
cable
as
shown.
Oo
Page
45
Route
end
B
of
the
prepared
coaxial
cable
through
the
cutout
in
the
upper
front
corner
of
the
center
panel.
Thisend
of
the
cable
will
be
connected
later.
BA
Route
end
A
of
the
large
coaxial
cable
along
the
oY
edge
of
the
front
subpanel
as
shown.
Then
refer
to
inset
drawing
#2
and
connect
the
end
of
the
inner
lead
to
switch
SW2D
lug
11
(S-3).
Wrap
the
free
end
of
the
bare
wire
coming
from
switch
SW2C
lugs
7
around
the
cable
shicld.
Then
solder
the
wire
to
the
shield.
Prepare
the
following
lengths
of
medium
bare
wire.
Use
these
lengths
of
wire
in
the
next
three
steps.
Two
2-3/4"
One
2-1/4"
Connect
a
2-3/4”
medium
bare
wire
from
capaci-
tor
C29
(S-1)
to
switch
SW2E
lugs
4
(both
lugs).
Ider
the
wire
to
both
switch
lugs.
Connect
a
2-3/4"
medium
bare
wire
from
capaci-
tor
C28
(S-1)
to
switch
SW2E
lugs
6
(both
lugs).
Solder
the
wire
to
both
switch
lugs.
Connect
a
2-1/4"
medium
bare wire
from
capaci-
tor
C26
(S-1)
to
switch
SW2C
lugs
9
(both
lugs).
y7rolder:
the
wire
to
both
switch
lugs.
b
Y
Prepare
an
11"
length
of
large
red
stranded
wire.
Route
one
end
of
the
prepared
large
red
stranded
wire
through
the
cutout
in
the
bottom
of
the
center
panel.
This
end
of
the
wire
will
be
connected
later.
Connect
the
other
wire
end
to
plate
choke
RFC3
lug
2
(NS).
Connect
the
free
lead
coming
from
capacitor
C23
to
plate
choke
RFC3
lug
2
(S-2).
Cut
off
any
excess
lead
length.
VY
(C24:
Cut
both
leads
ofa
.001
uF
(1000
pF),
6000-volt
Y
ceramic
capacitor
to
1".
Then
connect
the
capacitor
from
solder
lug
CN
(NS)
to
plate
choke
RFC3
lug
1
(NS).
Cut
off
any
excess
lead
lengths.
C25:
Cutboth
leads
of
a
.001
pF
(1000
pF),
6000-volt
ceramic
capacitor
to
1”.
Then
connect
the
capacitor
from
solder
lug
CN
(S-2)
to
plate
choke
RFC3
lug
1
(NS).
Cut
off
any
excess
lead
lengths.

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