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Heathkit SB-1000 - Initial Tests; Primary Wiring

Heathkit SB-1000
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Heathkit
Page
53
INITIAL
TESTS
AND
ALIGNMENT
INITIAL
TESTS
In
the
following
steps,
you
will
perform
certain
tests
to
verify
that
your
Linear
Amplifier
is
wired
properly.
If
you
do
not
obtain
the correct
results
in
any
of
the
steps,
check
the
items
listed
in
some
of
the
steps
or
refer
to
the
“Troubleshooting
Chart"
beginning
on
Page
66.
Correct
the
problem
before
you
continue.
CAUTION:
Do
not
connect
the
line
cord
to
an
AC
outlet
until
astep
directs
you
to
do
so.
PRIMARY
WIRING
Refer
to
Pictorial
7-1
for
the
locations
of
the
test
points
called
out
in
the
following
steps.
IMPORTANT:
A
wiring
error
in
the
primary
wiring
circuit
(line
cord,
power
switch,
etc.)
of
your
kit
could
cause
you
to
receive
a
severe
electrical
shock.
These
‘Primary
Wiring
Tests”
will
help
you
eliminate
any
such
errors
that
may
exist.
¢
Be
sure
the
line
cord
plug
is
NOT
connected
to
N
an
AC
outlet.
NOTES:
1.
If
you
do
not
have
an
ohmmeter,
carefully
check
the
line
cord,
switches
SW3
and
SW4,
relay
K2,
and
the
power
transformer
wiring
against
that
shown
in
Pictorials
6-
S
wx
2,
63,
and
6-17
(Ilustration
Booklet,
Pages
20, 22,
and
50).
Make
sure
there
are
no
fine
strands
of
wire
or
solder
globs
touching
adjacent
terminals
or
the
chassis.
2.
If
you
have
an
ohmmeter,
perform
the
fol-
lowing
resistance
measurements.
Set
the
ohmmeter
to
the
R
x
10
range.
Connect
the
negative
ohmmeter
lead
to
the
ground
post
on
the
rear
of
the
chassis.
Leave
this
lead
connected
to
the
ground
post
until
a
steps
directs
you
to
disconnect
it.
Touch
the
positive
ohmmeter
lead
to
either
flat
prong
of
the
line
cord
plug.
The
ohmmeter
should
indicate
infinity
with
the
PWR/OFF
switch
on
or
off.
If
you
do
not
obtain
the
correct
indication,
check
the
wiring
of
switches
SW3
and
SW4,
relay
K2,
and
barrier
strip
RD.
Touch
the
positive
ohmmeter
lead
to
the
other
flat
prong
of
the
line
cord
plug.
The
ohmmeter
should
indicate
infinity
with
the
PWR/OFF
switch
on
or
off.
If
you
do
not
obtain
the
correct
indication,
check
the
wiring
of
switches
SW3
and
SW4,
relay
K2,
and
barrier
strip
RD.
Touch
the
positive
ohmmeter
lead
to
the
round
prong
of
the
line
cord
plug.
The
ohmmeter
should
indicate
zero
ohms
with
the
PWR/OFF
switch
on
or
off.
If
you
do
not
obtain
the
correct
indication,
make
sure
the
green
line
cord
lead
is
properly
connected
and
soldered
to
solder
lug
RA.

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