Heathkit HP-23A - Page 14

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!