Heathkit SB-10 - Page 12

space
has
been
provided
for you
to check
off
each
operation
as it is
completed.
This
is
partic-
:la.rl,y
imporlalt
in
wiring
and it
may
prevent
omiss'ions
or
errors,
especially
where
your
work
is
interrupted
freouen
v
as the
wiring
prog.esses.
some
tit
tultrie;;;;;;;#i"und
it
hetpfut
to mark
each
lead
in
coiored
pencil
oi
it
"
"pi"io"irf
"l
,t
i"
,aa"d.
The
abbreviation
"NS'r
indicates
that
the
connection
should
notbe
soldered
as
yet,
for
other
wires
will
be
added'
when
the last
wire
is installed,
theterminal
should
be soldered
and
the
abbrevi-
ation
I'srr
is
used
to
indicate
this. Note
that
a
number
appears
after
each
solder
(s)
instruction.
This
number
indicates
thenumber
of leads
"ont
""iJ
to
the
terminal
in
question.
For
example,
if
the instructions
read,
"connect
a 47 Ke
resistor
from
socket
El
(s-2)
to E6
(Ns),,,
it
will
be
understood
that
there
will
be
two
leads
connectea
to
tn"
terminal
at
the
time
it is
soldered.
This
additional
check
wiII
help
avoid
errors.
We
suggest
you
do
the following
before
any
work
is
started:
l.
Attach
the
larEe fold-in pictorials
to the
wall
above your
work
bench.
2'
Review
the
asJemblv
"n,i
*i.ing-insi.r"irli".
*itti"
i"
an
excellent
time
to leaf
through.the
entire
instruction
section
and familiarize
yourself
with
the
p"";;;;;;:''
-" ^"
3'
Lay
out
all
parts
so
thatthey
are readily
ivailable.
Refer
tothe
general
information
inside
the
front
and
back
covers
of this
manuar
to
help you
identify
"o*ionu"l".-----
STEP-BY-STEP
ASSEMBLY
Due
to
the
compactness
of.the
sB-10,
the
physical
design
and
layout
was accomplished
on a
sectionar,
or
sub-chassis,
basis'
The
main
ciassis
contains
the
audio,
audio
phasing,
voice
"?."t"91'and
anti-trip
circuitry,
and
the four
sul-
ctrassis
pieces
are
mounted
onthe
main
chassis
after
they
have
been
wired.
ihis
provides
"""v
*""""
to-.lI
components
during
assembly,
but
the
net
result
is
a fairlv
compact
ylt
easy
to
""iui""
"nit.
one
sub-chassis
contalns
the
balarced
modulato-r
circuitry;
a- second,
tir"
nr
ii"""li"y,"."i,n"
other
two
make
up
the front
and
rear
aprons'
Lead
lengths
given.are
liberal
"na"ny
"*"a"
wire
should
be
trimmed
off, thus
afford-
rng
the
most
direct
connection.
ASSEMBLY
AND
WIRING
OF
THE
AUDIO
AND
P
HASING
DECK
Moylt
all
sockets
and
parts
as detailed
below.
Observr
@"e'*..",tr,,""
altevrate
the
necessity
of repeating
instructions
in
each
step,
use
l/4,,i_"+a
p""
L"o
machine
screws'
#3 lockwashers
and
3-48.nuts
for
securing
itre
miniature
sockets.
Install
alt
terminal
strips
with
their
mounting
feet
between
tne
rocwa?rrer
and
nut.
This
practice
a-ffords
a better
connection
to
chassis.
Refer
to
pictorials
1
ana
Z ]or
ttre fotfo*irrg
stJpJ.
(
!J
select
10
each,
r/4"
x J-48
BHMS,
#3
lockwashers
and
3-4g
nuts
for
mounting
sockets.
(
11
Install
two
g
pin
shielded
phenolic
miniature
sockets
at Iocations,,A,,
Mount
A
lug
terminal
strips,
one
with
a
ground
lug
and
the
other
witnout,
as shown,
at the
enals nearest
the
chassis
flange'
place
a
small
#d
sorder
tug
unaer
trr"'"irr""
-"iriirrg'"sc"ew
at
,,c,,.
Orient
as shown
in
pictorial
1.
"
Install
a
7
pin
miniature
socket
at
'rB??.
secure
a small
#6 ground
lug
with
the hardware
at
the
end
nearest
the
chassis
flange.
(,i)
(
$
Instatl
a
g
pin
miniature
socket
at
,'D',.
(y')
Installagpin
miniature
socket
at"F"with
athreelug,
center
groundterminal
strip,
mounted
as
shown
in
pictorial
l.
(vi
rnstatt
the mica
octal socket
at
"E".
orient
as
shown
in
pictorial
1.
use 6_32
RHMS,
#6
lockwashers
and #6-32
nuts.
Page
12