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Heathkit HP-23A - Operating the Power Supply

Heathkit HP-23A
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12
()
Place
the
plug
cap
over
the
prepared
end
of
the
cable
and,
referring
to
Detail
5B,
connect
the
cable
wires
to
the
11-pin
plug
as
follows:
WIRE
COLOR
TO
PIN
()
Black
2
(8-1)
()
Orange
3
(8-1)
(_)
Yellow
4
(8-1)
()
White
7
(8-1)
()
Green
1
(8-1)
for
-130
V
bias,
or
11
(S-1)
for
adjustable
bias,
()
Read
6
(S-1)
for
12
V
filaments,
or
&
(S-1)
for
6
V
filaments,*
‘If
more
than
6
amperes
of
filament
current
will
be
drawn
under
6
volt
operation,
parallel
the
red
cable
wire
with
a
length
of
#18
wire,
()
Brown
9
(S-1)
SEE
NOTE
BELOW.
(
)
Blue
10
(S-1)
SEE
NOTE
BELOW.
NOTE:
If
this
Power
Supply
is
to
be
used
with
equipment
that
does
not
have
provisions
for
switching
the
AC
power
on
and
off,
install
a
jumper
wire
between
pins
9
(S-1)
and
10
(S-1)
of
the
11-pin
plug.
Be
sure
that
the
brown
and
blue
cable
wires
are
NOT
connected
to
these
pins,
war
RED
rive
“ALTERNATE
CONNECTIONS
SEE
STEPS
Souver
Detail
58
If
this
Power
Supply
is
tobe
used
with
equipment
that
does
have
provisions
for
switching
the
AC
power
on
and
off,
connect
the
brown
and
blue
cable
wires
as
directed
in
the
steps,
()
Snap
the
cap
onto
the
power
cable
plug.
‘This
completes
the
assembly
of
your
Heathkit
AC
Power
Supply,
Proceed
to
the
Initial
Tests
section,
INITIAL
TESTS
To
avoid
possible
damage,
it
is
important
that
you
use
an
ohmmeter
to
make
the
following
re-
sistance
checks
before
connecting
or
turning
on
the
Power
Supply,
If
all
measurements
are
satis-
factory,
proceed
to
the
Operations
section,
If
any
of
the
measurements
do
not
agree
with
the
values
in
the
table,
refer
to
the
In
Case
Of
Dif-
ficulty
section,
DO
NOT
turn
on
the
Power
Supply
until
the
difficulty
has
been
corrected,
()
Set
the
ohmmeter
to
the
R
x
1
scale,
Because
some
of
the
circuits
to
be
measured
contain
diodes,
you
will
obtain
different
resist-
ance
readings
if
the
polarity
of
the
meter
leads
is
reversed
in
the
following
measurements,
Therefore,
in
the
first
step
you
will
determine
the
polarity
of
the
ohmmeter
test
leads
and
connect
the
proper
lead
to
chassis
ground,
(_)
Connect
the
negative
lead
of
the
meter
to
lug
3
and
the
positive
lead
to
lug
4
of
terminal
strip
J,
Ifthe
resistance
is
approximately
10
ohms,
connect
the
negative
meter
leadto
pin
7
(ground)
of
the
power
output
socket
for
the
following
resistance
checks,
If
the
meter
needle
remains
on
or
near
the
infinity
mark
(full
scale),
reverse
the
meter
leads,
If
you
now
get
a
reading
of
approximately
10
ohms,
connect
the
positive
lead
of
the
meter
to
pin
7
of
the
power
output
socket,

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