Heathkit HP-23A User manual
SERF-Fo1
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RUSH
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EBATH
RII”
ASSEMBLIY
MANUAL,
Gegucarncarr
AC
POWER
SUPPLY
MODEL
HP-23A
Assembly
and
Operation
of
the
AC
POWER
SUPPLY
MODEL
HP-23A
TABLE
OF
CONTENTS
Introduction,
.
..
PANE
lA.
sawierovsewsiowereewee
|
8
Step-By-Step
Assembly
Chassis
Parts
Mounting,
....
4
Transformer
Wiring...
s+
1
Chassis
Wiring,
.
.
ae
7
Component
Installation,
8
Final
Wiring...
646+
10
Final
Assembly,
ae
i
Initial
Tests,
..
1
sec
cevccvcvccee|
12
Operation...
....4
+13
In
Case
Of
Difficulty,
...sseeveeves
4
Troubleshooting
Chart...
1.
.sseeeee
15
Specifications,
....
.
[16
Circuit
Description,
.....6.eeeeeeee
IT
Schematic
(fold-out
from
page)...
.
++.
[17
Chassis
Photograph,
..
esses
seee
18
Factory
Repair
Service,
,
,(fold-out
from
page),
...«
sranaiy
new
[18
Replacement
Parts Price
List...
......
[19
HEATH
COMPANY
BENTON
HARBOR,
MICHIGAN
49022
Page
2
INTRODUCTION
‘The
Heathkit
Model
HP-23A
AC
Power
Supply
is
designed
to
provide
all
the
necessary
operat-
ing
voltages
for
fixed
station
operation
of
Heathkit
amateur
radio
transceivers,
The
versa~
tility
and
many
features
of
this
Power
Supply
also
make
it
ideal
for
use
with
many
other
types
of
amateur
radio
equipment,
‘The
Power
Supply
features
a
high
voltage
source,
a
choice
of
two
low
voltage
sources,
fixed
and
adjustable
bias
sources,
and
6,3
and
12,6
volt
filament
sources,
Extensive
filtering
and
good
regulation
is
provided
for
the
DC
sources,
The
power
transformer
has
a
dual
primary
winding
which
can
be
connected
for
operation
from
either
120
or
240
VAC
power
lines.
A
series
connection
is
provided
at
the
power
output
socket
to
permit
turning
the
Power
Sup-
ply
on or
off
remotely
from
the
equipment
with
which
it
is
used,
A
toggle
switch
on
the
Power
Supply
is
used
to
select
the
value
of
low
B+
voltage
available
at
the
output
socket,
The
switch
also
will
turn
off
the
Power
Supply,
A
circuit
breaker
in
the
primary
circuit
provides
over-
load
and
short
circuit
protection,
All
output
voltage
connections
from
the
Power
Supply
are
made
through
the
power
output
socket
on
the
chassis,
This
provides
an
easy
means
of
rapidly
changing
the
equipment
from
mobile
to
fixed
station
operation,
Refer
to
the
Kit
Builders
Guide
for
complete
information
on
unpacking,
parts
identification,
tools,
wiring,
soldering
and
step-by-step
assem-
bly
procedure:
aes
_
Page
3
PARTS
LIST
To
order
replacement
parts,
refer
to
the
Replacement
Parts
Price
List
and
usethe
Parts
Order
Form
furnished
with
this
kit,
PART
PARTS
DESCRIPTION
No,
Per
Kit,
RESISTORS
(1)1-9-1
2
10
kQ
1
watt
(brown-black-
orange)
(21-15-20
1
1
kM
2
watt
(brown-black-
red)
1-24-25
100
k@
2
watt
(brown-black-
yellow)
CAPACITORS
(3)25-19
2
20
uF
electrolytic
25-36
1
40
UF
electrolytic
(4)25~34
4
125
F
tab-mount
electrolytic
HARDWARE
#6
Hardware
(5)250-8
8
#6
x
3/8"
sheet
metal
screw
(6)250-89
8
6-32
x
3/8"
screw
(7)
252-3
8
6-32
nut
(8)
254-1
9
#6
lockwasher
#8
Hardware
(99250-1376
8-32
x
3/8"
screw
(10)252-4
10
8-32
nut
(11)254-2
10
#8
lockwasher
(12)259-2
2
#8
solder
lug
NOTE:
The
numbers
in
parentheses
are
keyed
to
the
numbers
on
the
Parts
Pictorial
(fold-out
from
Page
3).
PART
PARTS
DESCRIPTION
No.
Per
Kit
MISCELLANEOUS
(13)10-57
3
10
k&
tab-mount
control
(14)
57-27
¥
Silicon
diode
(15)431-40
1
4-lug
terminal
strip
(16)431-55
1
6-lug
terminal
strip
(17)
481-1
2
Metal
capacitor
mounting
wafer
481-3
2
Phenolic
capacitor
mounting
wafer
(18)438-29
1
11-pin
plug
(19)
440-1
1
Plug
cap
(20)434-118
1
11-pin
socket
(21)435-1
1
Socket
mounting
ring
(22)61-12
1
DPDT
toggle
switch
(23)65-17
1
Circuit
breaker
(24)73-1
1
3/8"
grommet
(25)73-4
1
5/16"
grommet
54-198
1
Power
transformer
46-22
1
Filter
choke
200-505
1
Chassis
205-168-1
1
Bottom
plate
100-538-1
1
Cabinet
shell
(26)261-6
4
Rubber
foot
347-18
1
8-wire
cable
346-1
1
Black
sleeving
89-19
1
Line
cord
391-341
Blue
and
white
label
490-5
1
Nut
starter
597-260
1
Parts
Order
Form
597-308
1 Kit
Builders
Guide
1
Manual
(See
front
cover
for
part
number.)
Solder
Page
4
a
ga)
STEP-BY-STEP
ASSEMBLY
NOTE:
Before
you
begin
to
assemble
this
kit,
refer
to
the
Kit
Builders
Guide
for
complete
information
on
wiring,
soldering
and
step-by-
step
assembly
procedures,
As
you
perform
a
step
in
the
Step-By-Step
As-
sembly,
first
read
the
step
completely
through,
Then
perform
the
operation
as
directed,
Position
each
part
and
wire
as
shown
in
the
Pictorial
that
accompanies
the
series
of
steps,
The
Details
provide
specific
information
for
individual
steps,
Lockwashers
and
nuts
will
be
used
with
most
screws
when
mounting
parts,
unless
the
step
directs
otherwise,
Consequently,
only
the
size
and
type
of
hardware
to
be
used
will
generally
be
called
out
in
a
step,
For
example,
the
phrase
"Use
6-32
x
3/8"
hardware”
means
to
use
a
6-32
x
3/8"
screw,
one
or
more
#6
lockwashers,
and
a
6-32
nut,
Refer
to
the
Details
associated
with
the
step
for
the
proper
installation
of
the
hardware
and
the
correct
number
of
lockwashers,
CHASSIS
PARTS
MOUNTING
Refer
to
Pictorial
1
for
the
following
steps,
(_)
Install
the
10
k@
tab-mount
control
at
A
on
the
chassis
as
shown
in
Detail
1A,
Position
the
control
lugs
as
shown
in
Pictorial
1,
Secure
the
control
by
bending
the
tabs
against
the
chassis
as
shown,
Beno TABS
INSERT
CONTROL
ag
in
Store
TOWARD
HOLE
TAOS
IN
SLOTS
Detail
1A
HOLD
THE
SOCKET
IN
THE
CHASSIS
HOLE
AND
PLACE
ONE
END
OF
THE
RING
INTO
THE
GROOVE
OF
THE
SOCKET.
USING
A
SCREWDRIVER,
PRESS
THE
RING
INTO
THE
GROOVE
AROUND
THE
SOCKET
Detail
18
(_)
Refer
to
Detail
1B
and
mount
the
11-pin
socket
at
B
with
the
keyway
positioned
as
shown,
Use
the
socket
mounting
ring.
(_)
Install
the
3/8"
grommet
in
hole
C,
()
Install
the
5/16"
grommet
in
hole
D,
NOTE:
The
Heath
Company
has
provided
a
plastic
nut
starter
with
this
kit,
Use
this
nut
starter
to
hold
and
start
6-32
nuts
on
screws,
Refer
to
Page
3
of
the
Kit
Builders
Guide,
s3200/8"
screw
Detail
1¢
Page
5
NOTE:
To
insure
a
good
ground
connection,
on
the
underside
of
the
chassis
scrape
away
a
small
amount
of
paint
around
the
mounting
holes
for
the
solder
lugs
at
M,
the
terminal
strip
at
L,
and
the
two
holes
each
for
capacitors
H
and
K,
()
Refer
to
Detail
1C
and
install
a
etal
capacitor
mounting
wafer
at
H
and
a
6-
terminal
strip
at
J,
Install
the
‘mounting
wafer
on
the
top
of
the
chassis
and
the
ter-
minal
strip
under
the
chassis,
Use
6-32
x
3/8"
hardware,
Position
the
terminal
strip
as
shown
in
the
Pictorial,
Be
sure
to
use
two
lockwashers
with
all
terminal
strips,
(_)
Mount
the
other
metal
capacitor
mounting
wafer
on
top
of
the
chassis
at
K,
Use
6-32
x
3/8"
hardware,
()
In
like
manner,
mount
phenolic
capacitor
mounting
wafers
on
top
of
the
chassis
at
F
and
G,
Use
6-32
x
3/8"
hardware,
(_)
Refer
to
Detail
1D
andprepare
the
mounting
foot
of
a
4-lug
terminal
strip,
Cut
the
front
of
the
foot
with
diagonal
cutters,
then
spread
the
cut
until
an
8-32
screw
will
fit
through
the
hole,
This
terminal
strip
will
be
mounted
with
the
filter
choke
in
the
following
steps.
Detail
1D
Oy
wy
1"
deni
Hii
Locewaswer
Detail
1E
(
)
Cut
both
leads
of
the
filter
choke
toa
length
(
of
4-1/2",
and
remove
1/4"
of
insulation
from
the
cut
end
of
each,
Measure
the
leads
from
where
they
leave
the
choke,
Apply
a
small
amount
of
solder
to
the
end
of
each
lead
after
cutting,
Refer
to
Detail
1E
and
position
the
filter
choke
on
top
of
the
chassis
with
its
leads
through
grommet
D,
Mount
the
choke
with
8-32
x
3/8"
hardware
at
L
and
M,
with
the
prepared
4-lug
terminal
strip
at
L
and two
#8
solder
lugs
at
M,
Be
sure
to
use
two
lockwashers
with
the
terminal
strip,
Posi-
tion
the
solder
lugs
and
terminal
strip
as
shown,
Bend
the
end
of
the
solder
lugs
up
away
from
the
chassis,
Page
6
eas
MEASURE
ALL
LEADS
FROM
WHERE
THEY
LEAVE
THE
TRANSFORMER.
BLK
3-1/2"
BUK-GRN
3-112
BLK-RED
3-1/2"
BLC-YEL
3-1/2"
REDS
RED-YEL
6°
vets
GRN-YEL
5
RN
5
BLU
a
BRN
(00
NOT
Cul)
Detail
1F
NOTE:
Use
the
scale
on
the
fold-out
from Page
9
for
measuring
wires
in
the
following
step.
()
Refer
to
Detail
1F
and
cut the
Power
Transformer
leads
to
the
following
lengths
(measured
from
where
they
leave
the
trans-
former):
WIRE
COLOR
—
LENGTH
Black
3-1/2"
Black-green
3-1/2"
Black-red
3-1/2"
Black-yellow
3-1/2"
Red
sr”
Red-yellow
6"
Yellow
sr"
Yellow-brown
—_—_
do
not cut
Green-yellow
5"
Green
st
Blue
4a"
Brown
do
not
cut
(_)
Remove
1/4"
of
insulation
from
the
end
of
each
cut
transformer
lead,
and
melt
asmall
amount
of
solder
on
the
bared
end
to
hold
the
wire
strands
together,
(_)
Mount
the
power
transformer
in
the
large
cutout
on
the
chassis
as
shown
in
Detail
1G,
Use
#8
lockwashers
and
8-32
nuts,
(_)
Refer
to
Detail
1#
and
install
125
uF
tab-
mount
electrolytic
capacitors
in
the
mount-
ing
wafers
at
F,
G,
H,
and
K,
Insert
the
capacitor
lugs
into
the
wafers,
making
sure
that
the
connecting
lug
of
each
capacitor
is
oriented
as
shown
on
the
Pictorial,
Then
twist
each
mounting
lug
1/8
turn,
B32
nur
$
#8
LocKwasHir
Detail
1G
VENT
THE
CAPACITOR
AS
SHOWN
IN
THE
CFORIAL,THEN
PUSH
THE
LUGS.
OF
THE
CAPACITOR
INTO
THE
SLOTS
OF
THE
WAFER.
WHILE
HOLDING
THE
CAPACITOR
IW
PLACE,
TWIST
TACH
OF
THE
MOUNTING
LUGS
APPROXIMATELY
Wa
TURN
Detail
1H
az
Page
7
This
completes
the
Chassis
Parts
Mounting,
CAUTION:
When
the
chassis
is
bottom
side
up,
its
weight
will
rest
on
the
transformer
and
the
mounted
capacitors,
Take
care
that
you
do
not
damage
the
capacitors
during
the
remainder
of
the
assembly,
TRANSFORMER
WIRING
Refer
to
Pictorial
2
(fold-out
from
Page
9)
for
the
following
steps,
Position
all
wires
andleads
as
shown,
Connect
the
power
transformer
leads
as
follows:
LEAD
COLOR
=
CONNECT
TO
()
Red
lug
2
of
terminal
strip
J
(NS),
()
Blue
lug
4
of
terminal
strip
J
(NS),
(.)
Red-yellow
lug
1
of
capacitor
H
(NS).
()
Green-yellow
lug
6
of
socket
B
(S-1),
()
Green
lug
8
of
socket
B
(S-1),
()
Yellow
lug
2
of
socket
B
(8-1).
(_)
Route
the
brown
and
yellow-brown
leads
as
shown
in
the
Pictorial,
These
leads
will
be
connected
later,
Alternate
Line
Voltage
Wiring
The
power
transformer
in
this
Power
Supply
is
equipped
with
a
dual
primary
winding,
It
maybe
operated
from
either
105-125
VAC
or
210-250
VAC,
depending
on
the
way
in
which
the
primary
leads
are
connected,
Two
sets
of
wiring
instruc-
tions
are
given,
Use
only
the
instructions
which
apply
to
the
line
voltage
that
you
intend
to
use.
120
VAC
Wiring
Refer
to
Pictorial
2,
()
Connect
the
black-yellow
and
black-red
transformer
leads
to
lug
9
of
socket
B
(S-2),
(_)
Connect
the
black
and
black-green
trans-
former
leads
to
lug
6
of
terminal
strip
J
(NS).
240
VAC
Wiring
Refer
to
Detail
2A,
()
Connect
the
black-red
transformer
lead
to
lug
9
of
socket
B
(S-1),
()
Connect
the
black
transformer
lead
to
lug
6
of
terminal
strip
J
(NS),
()
Connect
the
black-green
and
black-yellow
transformer
leads
to
lug
5
of
terminal
strip
J
(8-2),
CHASSIS
WIRING
()
Connect
the
red
filter
choke
lead
extending
through
grommet
D
to
lug
1
of
capacitor
K
(NS).
( )
Connect
the
black
filter
choke
lead
extending
through
grommet
D
to
lug
1
of
terminal
strip
L
(NS),
()
Cut
a
9"
length
of
the
8-wire
cable,
Refer
to
Detail
2B
and
remove
the
individual
wires
from
the
9"
cable,
These
wires
will
be
used
in
the
following
steps.
S-WIRE
CABLE
Detail
2B
Page
8
SEs
NOTE:
In
the
following
step
you
will
bedirected
to
prepare
wires
for
connection,
To
prepare
a
wire,
cut
it
to
the
stated
length
and
remove
1/4"
of
insulation
from
each
end,
Melt
a
small
amount
of
solder
onto
each
exposed
end
to
hold
the
wire
strands
together.
(()
Prepare
the
following
lengths
of
wire.
The
wires
are
listed
in
the
order
in
which
they
will
be
used.
()
Connect
@
1-1/2"
red
wire from
lug
1
of
capacitor
H
(NS)
to
lug
2
of
eapacitor
F
(NS).
()
Connect
a
5"
red
wire
from
lug
4
of
socket
B(S-1)
to
Jug
1
of
capacitor
F
(NS).
()
Connect
an
8"
orange
wire
from
lug
3
of
socket
B
(S-1)
to
lug
1
of
terminal
strip
L
(NS).
()
Connect
an
8”
yellow
wire
from
lug
1
of
socket
B
(S-1)
to
lug
3
of
terminal
strip
L
(NS).
()
Connect
2-1/2”
brown
wire
from
Ing
7
of
socket
B
(S-1)
to
lug
4
of
capacitor
H
(S-1).
Also
solder
lug
4
to
the
mounting
wafer
(S-1).
()
Connect
a
9”
green
wire
from
lug
11
of
socket
B
(S-1)
to
lug
2
of
control
A
(S-1).
COMPONENT
INSTALLATION
Refer
to
Pictorial
3
for
the
following
steps,
NOTE:
All
resistors
used
are
2
watt
unless
specified
otherwise
in
the
steps,
()
Connect
a
100
k®
(brown-black-yellow)
resistor
from
lug
2
of
capacitor
H
(S-1)
to
lug
5
of
capacitor
F
(S-1),
Apply
enough
heat
and
solder
to
lug
2
of
H
to
solder
it
to
the
mounting
wafer,
()
Connect
a
100
k®
(brown-black-yellow)
resistor
from
lug
1
of
capacitor
H
(8-3)
to
lug
1
of
capacitor
F
(NS),
)
Connect
a
100
k®
(brown-black-yellow)
re-
sistor
from
lug
5
of
capacitor
H
(8-1)
to
lug
2
of
capacitor
F
(S-2),
)
Connect
a
100
k®
(brown-black-yellow)
re-
sistor
between
lugs
1
(NS)
and
4
(S-1)
of
capacitor
F,
)
Install
a
1-1/4”
length
of
black
sleeving
on
one
lead
of
a
100
kf
(brown-black-yellow)
resistor,
Then
connect
this
lead
to
lug
1
of
terminal
strip
L
(NS),
Connect
the
other
lead
to
the
indicated
solder
lug
at
M
(NS),
)
Connect
a
1000
&
(brown-black-red)
re-
sistor
from
lug
3
(NS)
to
lug
4
(NS)
of
terminal
strip
L,
)
Connect
a10k0
(brown-black-orange)
1
watt
resistor
from
lug
1
of
control
A
(8-1)
to
lug
2
of
terminal
strip
L
(8-1),
)
Connect
a10k®
(brown-black-orange)
1
watt
resistor
from
lug
3
of
control
A
(S-1)
to
lug
3
of
terminal
strip
L
(NS),
)
Connect
the
positive
(+)
lead
of
the
40
uF
electrolytic
capacitor
to
lug
1
of
terminal
strip
L
(S-4),
Connect
the
other
lead
to
the
indicated
solder
lug
at
M
(S-1),
Position
this
capacitor
as
shown
in
the
Pictorial,
)
Cut
the
negative
(-)
leads
of
each
of
the
two
20
uF
electrolytic
capacitors
toa
length
of
1-1/4",
Then
install
1"
lengths
of
black
sleeving
on
the
negative
leads,
)
Connect
the
positive
(+)
lead
of
one
of
the
20
uF
lectrolftic
capacitors
to
the
indicated
solder
lug
at
M
(NS),
Connect
the
negative
lead
to
lug
3
of
terminal
strip
L
(8-4),
Po-
sition
this
capacitor
next
to
the
40
uF
ca-
pacitor
installed
previously,
)
Connect
the
positive
(+)
lead
of
the
other
20
uF
electrolytic
capacitor
to
the
indicated
solder
lug
at
M
(8-3),
Connect
the
negative
lead
to
lug
4
of
terminal
strip
L
(NS),
cATHOUE
ae
NOTE
WHEN
INSTALLING
DLODES.
BE
suRE
TO
PLACE
THE
CATHODE
ENO
AS
DIRECTED.
THE
CATHOOE
END
15
MARKED
WITH
CITHER
A
COLOR
PICTORIAL
3
END
COLOR
DOT.
COLOR
BAND, OR
A
SYMBOL
symaot
\eATWODE
tor
color
cook ctor
Detail
34
Refer
to
Detail
3A
to
identify
the
cathode
leads
of
the
silicon
diodes
that
will
be
used
in
the
following
steps,
( )
Connect
the
cathode
lead
of
a
silicon
diode
to
lug
1
of
capacitor F
(S-4),
Connect
the
other
lead
to
lug
1
of
terminal
strip
J
(NS),
()
Connect
the
cathode
lead
of
a
silicon
diode
to
lug
1
(8-2)
andthe
other
leadto
lug
2
(NS)
of
terminal
strip
J.
(_)
Connect
the
cathode
lead
of
a
silicon
diode
to
lug
2
(S-3)
and
the
other
leadtolug
3
(NS)
of
terminal
strip
J.
()
Connect
the
cathode
lead
of
a
silicon
diode
to
lug
3
(S-2)
and
the
other
lead
to
lug
4
(S-2)
of
terminal
strip
J,
()
Connect
the
cathode
lead
of
a
silicon
diode
to
lug
1
of
capacitor
K
(S-2),
Connect
the
other
lead
to
lug
1
of
capacitor
G
(NS),
()
Connect
the
cathode
lead
of
a
silicon
diode
to
lug
1
of
capacitor
G
(S-2),
Connect
the
other
lead
to
lug
5
of
capacitor
K
(S-1).
Apply
enough
heat
and
solder
to
lug
5
to
solder
it
to
the
mounting
wafer,
_
Sass
Detail
44
FINAL
WIRING
Refer
to
Pictorial
4
for the
following
steps,
()
Install
the
DPDT
toggle
switch
at
N
as
shown
in
Detail
4A,
Use
the
hardware
supplied
with
the
switch,
and
position
the
nut
on
the
bushing
as
shown,
CAUTION:
Before
installing
the
circuit
breaker
in
the
following
step,
make
sure
the
circuit
breaker
body
clears
the
adjacent
wiring
of
ca~
pacitor
H
by
at
least
1/8",
(_)
Refer
to
Detail
4B
and
install
the
circuit
breaker
at
P
with
the
solder
lugs
oriented
as
shown,
Bend
the
mounting
tabs
as
shown,
()
Connect
the
brown
lead
from
the
power
transformer
to
lug
1
of
switch
N
(S-1),
()
Connect
the
yellow-brown
lead
from
the
power
transformer
to
lug
3
of
switch
N
(NS),
(_)
Install
a
1"
length
of
black
sleeving
on
each
lead
of
a
silicon
diode,
Connect
the
cathode
lead
of
this
diode
to
lug
3
of
switch
N
(S-2)
and
the
other
lead
to
lug
4
ofterminal
strip
L
(8-3),
Oy
sy"
2’
Bosom
EDgt
OF
CHASSIS
a
Age
BEND
TABS
TOWARD
BUTTON
Detail
48
()
Prepare
the
following
lengths
of
wire:
4"
blue
5"
black
1-1/2"
black
1-1/2"
black
(_)
Connect
a
4”
blue
wire
from
lug
5
of
capaci-
tor
G
(S-1)
to
lug
2
of
switch
N
(8-1),
()
Connect
a
5”
black
wire
from
lug
5
of
switch
N
(S-1)
to
lug
10
of
socket
B
(S-1),
()
Connect
a
1-1/2"
black
wirefrom
lug4(S-1)
to
lug
6
(NS)
of
switch
N,
()
Connect
a
1-1/2"
black
wire
from
lug
6
of
switch
N
(S-2)
to
lug
2
of
circuit
breaker
P
(8-1).
()
Melt
a
small
amount
of
solder
onto
each
of
the
bared
ends
of
the
line
cord
to
hold
the
wire
strands
together,
Then
insert
the
end
of
the
cord
through
grommet
C
and
tie
a
knot
6"
from
the
end,
(EE
eee
==
__
Page
11
( )
Connect
one
of
the
line
cord
wires
to
lug
1
of
circuit
breaker
P
(S-1),
(_)
Connect
the
remaining
line
cord
wire
tolug
6
of
terminal
strip
J
(S-3)
[S-2
if
wired
for
240
V.)
Pull
any
excess
line
cord
back
through
grommet
C,
and
position
the
portion
that
is
is
inside
the
chassis
as
shown,
This
completes
the
wiring
of
the
Power
Supply.
Carefully
examine
all
connections,
looking
for
unsoldered
connections,
short
circuits,
and
loose
wires
or
components,
Make
sure
that
none
of
the
lugs
of
socket
B
are
touching
each
other.
Tip
and
shake
the
Power
Supply
to
dislodge
any
wire
clippings
or
bits
of
solder
that
may
have
fallen
into
the
wiring,
then
proceed
to
the
Final
Assembly
section
that
follows,
FINAL
ASSEMBLY
Refer
to
Pictorial
5
for
the
following
steps,
(_)
Install
four
rubber
feet
on
the
bottom
plate.
Use
8-32
x
3/8"
screws,
#8
lockwashers,
and
8~32
nuts,
()
Install
the
blue
and
white
label
on
the
bottom
plate
at
the
location
shown
in
Pic-
torial
5,
Carefully
peel
away
the
backing
paper
and
press
the
label
into
position,
Be
sure
to
refer
to
the
numbers
on
this
label
in
any
communications
you
have
with
the
Heath
Company
about
this
kit.
TAKING
CARE
NOT
TO
CUT
THE
INNER
CONDUCTORS.
THE
OUTER
INSULATION
OF
THE
CABLE
sover”
PAL
>
Detail
5A
()
Install
the
bottom
plate
on
the
chassis
with
#6
x
3/8"
sheet
metal
screws,
(_)
Install
the
cabinet
shell
on
the
chassis,
Use
#6
x
3/8"
sheet
metal
screws,
Power
Cable
(_)
Refer
to
Detail
5A
and
prepare
one
end
of
the
8-wire
cable,
Page
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,
aS
__
(_)
Set
your
ohmmeter
to
the
R
x
10
k
resist-
ance
scale,
Now
use
the
remaining
meter
lead
to
verify
the
resistance
measurements
in
each
of
the
follow-
ing
steps,
Note
that
the
resistance
at
pin
11
will
vary
with
the
setting
of
the
BIAS
ADJUST
control.
When
the
meter
needle
continues
to
move
upscale,
it
indicates
that
there
is
a
large
capacitor
in
the
circuit,
Give
the
needle
a
few
seconds
to
com-
plete
its
movement
before
making
the
reading,
SOCKET
PIN
OHMS
()
1
22
kO
minimum
()
2
Infinity
()
3
‘75
k2
minimum
()
4
75
k2
minimum
Page
13
SOCKET
PIN
OHMS
(=)
5
Infinity
(a) 6
Infinity
()
¥
on
ei
8
Infinity
(=)
9
Infinity
a)
10
Infinity
()
un
10
kQ
to
20
ka
NOTE:
DO
NOT
turn
on
the
Power
Supply
until
the
proper
connector
for
your
equipment
has
been
installed,
as
outlined
in
the
following
Operations
section
of
this
Manual,
OPERATION
CAUTION:
The
output
voltage
of
this
Power
Supply
can
be
lethal,
Also,
the
potential
stored
in
the
large
capacitors
is
dangerous,
Allowtime
for
these
capacitors
to
discharge
through
the
bleeder
resistors
before
working
on
the
Power
Supply.
The
capacitors
can
be
discharged
more
quickly
by
shorting
the
capacitor
lugs
to
the
chassis
with
a
screwdriver
blade,
In
a
situa-
tion
where
electrical
shock
is
a
possibility,
‘stand
on
some
dry
insulating
material
and
work
with
one
hand
behind
your
back,
Never
attempt
to
do
any
work
on
the
Power
Supply
with
the
line
cord
connected
to
an
AC
outlet,
Connections
at
the
free
end
of
the
8-conductor
power
supply
cable
will
depend
on
the
require-
ments
of
the
equipment
to
be
powered,
With
the
cable
wired
as
directed
in
this
Manual,
the
no-
load
voltages
shown
in
Table
1
will
be
available
at
the
free
end
of
the
cable,
It
is
recommended
that
a
connector
which
attaches
to
the
power
input
socket
on
your
equipment,
be
permanently
in-
stalled
on
the
free
end
of
this
cable,
Connectors
and
connection
instructions
are
supplied
with
Heath
products designed
for
use
with
this
Power
Supply.
Color
-130
VDC
or
-40
to
-80
VDC
at
1
mA,
Filament
common,
+275
VDC
or
+350
VDC,
+820
VDC,
6
VAC
or
12
VAC,
Ground
wire,
AC
switch
in
equipment,
AC
switch
in
equipment,
*The
voltage
or
function
available
at
these
cable
wires
depends
upon
how
the
plug
at
the
other
end
of
the
cable
was
wired
in
the
steps
on
Page
12,
TABLE!
Page
14
()
Connect
the
power
cable
from
the
Power
Supply
to
your
equipment.
()
Connect
the
line
cord
plug
to
an
electrical
outlet
supplying
the
voltage
for
which
the
Power
Supply
was
wired
(120
VAC
or
240
VAC),
(_
)
Select
the
desired
low
B+
voltage
by
moving
the
AC
OFF
switch
tothe
right
for
350
VDC,
or
to
the
left
for
275
VDC,
If
your
equipment
does
not
have
provisions
for
remote
control
of
the
Power
Supply,
this
will
turn
the
Power
Supply
ON,
(Plate
and
filament
voltages
are
always
turned
on
and
off
simultaneously.)
(_)
If
your
equipment
has
provisions
for
remote
control
of
the
Power
Supply,
turn
the
equip-
ment
off-on
switch
to
ON,
()
If
you
are
using
the
adjustable
bias,
adjust
the
bias
voltage
as
necessary
with
the
BIAS
ADJUST
control,
()
The
Power
Supply
may
be
turned
off
by
the
AC
OFF
switch
onthe
chassis,
or
by
the
off-
‘on
switch
on
your
equipment,
provided
that
it
was
wired
for
remote
control,
IN
CASE
OF
DIFFICULTY
‘This
section
of
the
Manual
is
divided
into
two
parts,
The
first
part,
titled
General
Trouble-
shooting
Information,
describes
what
todo
about
any
difficulties
that
may
occur
right
after
the
Power
Supply
is
assembled,
‘The
second
part,
a
Troubleshooting
Chart,
is
provided
to
assist
in
servicing
ifthe
General
In-
formation
does
not
clear
up
the
problem,
or
if
difficulties
occur
after
the
Power
Supply
has
been
in
operation
for
some
time,
This
Chart
lists
some
difficulties
which
could
arise,
and
several
possi-
ble
causes,
GENERAL
TROUBLESHOOTING
INFORMATION
1,
Recheck
the
wiring,
Trace
each
leadincol-
ored
pencil
on
the
Pictorial
as
itis
checked,
It
is
frequently
helpful
tohave
a
friend
check
your
work,
Someone
whois
not
familiar
with
the
unit
may
notice
something
consistently
overlooked
by
the
builder.
2,
About
90%
of
the
kits
that
are
returned
to
Heath
Company
for
repair
do
not
function
properly
due
to
poor
connections
and
solder-
ing.
Therefore,
many
troubles
can
be
elimi-
nated
by
reheating
all
connections
to
make
sure
that
they
are
soldered
as
described
in
the
soldering
section
of
the
Kit
Builders
Guide.
3.
Check
the
values
of
the
parts,
Be
sure
that
the
proper
part
has
been
wired
intothe
cir-
cuit,
as
shown
in
the
Pictorial
diagrams
and
as
called
out
in
the
wiring
instructions,
4,
Check
for
bits
of
solder,
wire
ends
or
other
foreign
matter
which
may
be
lodged
in
the
wiring,
5,
If,
after
careful
checks
the
trouble
is
still
not
located,
check
voltage
readings
against
those
on
the
Schematic,
NOTE:
All
voltage
readings
were
taken
with
an
11
megohm
input
voltmeter,
Voltages
shown
are
with
no
load
on
the
output,
6.
A
review
of
the
Circuit
Description,
and
a
study
of
the
Schematic
Diagram
will
help
you
locate
a
difficulty
in
the
Power
Supply.
7.
Check
for
loose
hardware,
Be
especially
careful
that
metal
capacitor
mounting
wa-
fers
and
terminal
strip
mounting
feet
are
well
grounded,
NOTE:
Inan
extreme
case
where
you
are
unable
to
resolve
a
difficulty,
refer
to
the
Service
and
Warranty
sections
of
the
"Kit
Builders
Guide",
andtothe
"Factory
Repair
Service"
information
on
the
fold-out
from
Page
18
of
this
Manual.
Troubleshooting
Chart
Completely
inoperative,
Circuit
breaker
open,
Switch
defective,
Pin
9
or
10
on
power
output
socket
or
cable
plug
open
or
incorrectly
wired,
Remote
switching
circuit
in
associated
equipment
faulty.
Power
transformer
defective,
Circuit
breaker
opens
Short
in
power
transformer
windings,
when
reset,
Short
in
rectifier
or
filter
circuits,
Short
in
associated
equipment,
Overload
in
associated
equipment,
No
high
B+
voltage,
Diodes
D1,
D2,
D3
or
D4
faulty,
Pin
4
on
power
output
socket
or
power
cable
plug
open
or
incorrectly
wired,
Power
transformer
defective,
No
low
B+
voltage,
Diode
D5
and/or
D6
open,
Filter
choke
Li
open.
Pin
3
of
power
output
socket
or
cable
plug
open
or
incorrectly
wired,
Switch
incorrectly
wired
or
faulty,
Polarity
of
diodes
or
filter
capacitors
is
incorrect,
No
bias
voltage,
Diode
D7
open.
Resistors
R7,
R8
or
R9
open,
Pin
11
or
1
of
power
output
socket
or
cable
plug
open
or
incorrectly
wired,
High
B+
voltage
only
half
Diode
D1,
D2,
D3
or
D4
open,
of
indicated
value
with
no
load,
less
under
load,
Low
B+
voltage
only
half
Diode
D5
or
D6
open.
of
indicated
value,
All
voltages
only
half
of
Power
transformer
primary
wired
for
220
indicated
values.
VAC
when
Power
Supply
is
used
on
120
VAC,
Page
16
SPECIFICATIONS
HIGH
VOLTAGE
SUPPLY
Output
Voltage.
sss
eeeeeerererececcees
Effective
Output
Capacitance,
Ripple...
Duty
Cycle,
LOW
VOLTAGE
SUPPLY
(high
tap)
Output
Voltage...
seers
eeeeeeeeeeees
LOW
VOLTAGE
SUPPLY
(low
tap)
Output
Voltage.
.
...
Ripple,
.
«
Duty
Cycle
OTHER
OUTPUT
VOLTAGES
Fixed
Bias,
Adjustable
Bias.
.
.
GENERAL
Power
Requirements,
.....+++seseeeeee
Dimensions,
....+eeeseeeeeeeceeeeees
Net
Weight.
820
volts
DC,
no
load,
700
volts
DC
at
250
mA,
62.5
uF.
Less
than
1%
at
250
mA,
Continuous
up
to
150
mA,
50%
at
300
mA,
350
volts
DC,
no
load,
300
volts
DC
at
150
mA
(with
100
mA
load
on
High
Voltage).
Less
than
,05%
at
150
mA,
Continuous
up
to
175
mA,
275
volts
DC,
no
load,
250
volts
DC,
at
100
mA
(with
100
mA
load
on
High
Voltage),
Less
than
.05%
at
150
mA,
Continuous
up
to
175
mA,
-130
volts
DC,
no
load,
-100
volts
DC,
at
20
mA,
-80
to
-40
volts
DC,
at
1
mA
maximum,
6,3
volts
AC
at
11
amperes,
12.6
volts
AC
at
5.5
amperes,
120/240
volts
AC,
50/60
Hz,
350
watts
maximum,
9"
long
x
4-3/4"
wide
x
6-3/4"
high,
16
Ibs,
The
Heath
Company
reserves
the
right
todiscon-
tinue
instruments
and
to
change
specifications
at
any
time
without
incurring
any
obligation
to
incorporate
new
features
in
instruments
pre-
viously
sold,
Page
17
CIRCUIT
DESCRIPTION
To
better
understand
the
circuit
operation,
refer
to
the
Schematic
Diagram
while
reading
the
following
description,
Each
section
of
the
Power
Supply
will
be
discussed
individually,
PRIMARY
CIRCUIT
The
AC
OFF
switch,
circuit
breaker,
trans-
former
primary,
and two
terminals
of
the
power
output
Socket
are
wired
in
series
across
the
AC
line,
The
Power
Supply
may
be
controlled
by
its
AC
OFF
switch,
or
by
the
off-on
switch
in
the
equipment
being
used
with
it,
The
dual
pri-
mary
winding
may
be
connected
in
series
for
240
VAC
line
operation,
or
inparallel
for
use
on
a
120
VAC
line,
HIGH
VOLTAGE
SECONDARY
CIRCUIT
The
high
voltage
winding
applies
approximately
282
volts
AC
(RMS)
to
a
full-wave
voltage
doub-
ler
rectifying
circuit
consisting
of
silicon
diodes
Di, D2,
D3
and
D4,
and
capacitors
C1
and
C2,
These
diodes
are
connected
so
that
during
one-
half
cycle,
capacitor
C2
becomes
charged;
and
during
the
next
half
cycle
capacitor
C1
is
charged,
Resistors
R1, R2,
R3,
and
R4
are
connected
in
the
circuit
to
provide
a
discharge
path
for
capacitors
C1
and
C2,
The
capacitors
are
charged
individu-
ally,
but
discharge
in
series
to
produce
aDC
volt-
age
equal
to
approximately
twice
the
applied
peak
AC
voltage,
Excellent
dynamic
regulation
is
pro-
vided
by
the
large
capacitance
values
of
C1
and
C2,
The
output
of
the
voltage
doubler
circuit
has
a
low
ripple
content
and
no
further
filtering
is
re-
quired,
LOW
VOLTAGE
CIRCUIT
‘The
low
voltage
winding
is
tapped
so
that
either
95
or
125
volts
AC
(RMS)
may
be
applied
to
a
half-wave
voltage-doubler
rectifying
circuit
consisting
of
diodes
D5
and
D6,
and
capacitors
C3
and
C4,
Capacitor
C4
is
‘also
used
with
choke
L1
and
capacitor
C5
in
a
pi
filter,
C4
being
the
input
capacitor
in
the
filter
network,
The
use
of
a
high-capacitance
input
pi
filter
network
provides
a
well
filtered
DC
output
that
has
a
very
low
percentage
of
ripple,
BIAS
VOLTAGE
CIRCUIT
The
bias
voltage
is
obtained
from
the
lowtap
on
the
low
voltage
winding,
About
95
volts
AC
(RMS)
is
applied
to
half-wave
rectifier
diode
D7,
Capacitors
C6
and
C7,
with
resistor
RT,
pro-
vide
a
filter
network
to
remove
the
ripple
from
the
bias
voltage,
Either
-130
volts
of
fixed
bias
or
from
~40
to
-80
volts
of
adjustable
bias
may
be
used
by
connecting
to
the
appropriate
pin
of
the
power
output
socket,
The
adjustable
bias
is
set
by
the
Bias
Adjust
control
R9,
Resistors
R8
and
R10
are
used
to
limit
the
range
of
the
Bias
Adjust
control,
FILAMENT
VOLTAGE
CIRCUIT
The
12,6
volt
filament
winding
is
center
tapped
so
that
either
6,3
or
12,6
volts
AC
can
be
ob-
tained,
Page
18
CHASSIS
PHOTOGRAPH
a=
Page
19
REPLACEMENT
PARTS
PRICE
LIST
To
order
parts,
use
the
Parts
Order
Form
fur-
nished
with
this
kit,
If
Parts
Order
Form
is
not
available,
refer
to
Replacement
Parts
in
the
Kit
Builders
Guide,
The
following
prices
apply
only
on
purchases
from
the
Heath
Company
where
shipment
is
toa
U,S.A,
destination,
Add
10%
(minimum
25
cents)
to
the
price
when
ordering
from
an
authorized
Service
Center
or
Heathkit
Electronic
Center
to
cover
local
sales
tax,
postage
and
handling,
Out-
side
the
U,S,A,
parts
and
service
are
available
from
your
local
Heathkit
source
and
will
reflect
additional
transportation,
taxes,
duties
and
rates
of
exchange,
PART
PRICE
DESCRIPTION
No,
Each
RESISTORS
1-9-1
10
10
k®
1
watt
1-15-2
15
1
k&
2
watt
1-24-2
15
100
kf
2
watt
CAPACITORS
25-19
55
20
uF
electrolytic
25-36
1,05
40
uF
electrolytic
25-34
2.25
125
4
F
tab-mount
electrolytic
HARDWARE
#6
Hardware
250-8
205
#6
x
3/8"
sheet
metal
screw
250-89
205
6-32
x
3/8"
screw
252-3
05
6-32
nut
254-1
205
#6
lockwasher
PART
PRICE
No,
_Each
#8
Hardware
250-137
05
252-4
+05
254-2
+05
259-2
205
MISCELLANEOUS
10-57
57-27
431-40
431-55
481-1
481-3
+10
438-29
440-1
434-118
435-1
61-12
1,70
65-17
+85
73-1
+10
73-4
+10
54-198
12,40
46-22
x
200-505
1,60
205-168-1
.65
100-538-1
1.35
261-6
+10
347-18
15/ft
346-1
.05/ft
89-19
355
490-5
10
331-6
+15
2,00
DESCRIPTION
8-32
x
3/8"
screw
8-32
nut
#8
lockwasher
#8
solder
lug
10
k
tab-mount
control
Silicon
diode
4-lug
terminal
strip
6-lug
terminal
strip
Metal
capacitor
mounting
wafer
Phenolic
capacitor
mounting
wafer
11-pin
plug
Plug
cap
11-pin
socket
Socket
mounting
ring
DPDT
toggle
switch
Circuit
breaker
3/8"
grommet
5/16"
grommet
Power
transformer
Filter
choke
Chassis
Bottom
plate
Cabinet
shell
Rubber
foot
8-wire
cable
Black
sleeving
Line
cord
Nut
starter
Solder
Manual
(See
front
cover
for
part
number.)
Other Heathkit Power Supply manuals
