Heathkit IT -3120 User Manual

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( ) Temporarily install a 250 kD/5000 D (5 k) control on
Connect a 1" bare wire from lug 9 (NS) through lug 4
the
su bpanel at S. Use a control lockwasher and a
(S-2)
of switch M to lug 6 of switch N (NS).
control nut.
Connect a 1-1/4" white wire from lug 6 of switch N
( )
Temporarily install a 15 kD control on the subpanel at
(S-2)
to lug 6 of switch P (NS).
T.
Use a control lockwasher and a control nut.
( )
Connect a 1-1/4" white wire from lug 6 of switch P
(S-2)
to lug 6 of switch R (NS).
Refer
to Pictorial 5 (fold-out from this page) for the
following steps.
( ) Prepare the
following lengths of wire:
( ) Position the free ends
of the wires coming from the
circuit board out of the way as shown.
8" white-red 12" white-gray
NOTE: When bare wire is called for in the following steps,
9" brown
8" yellow
cut the white wire to the indicated length; then remove all
6" white-violet
7" wh ite-green
of the insulation.
3" white
( ) Prepare the
following lengths of hookup wire :
1" bare 3/ 4" bare
1-1/2" white
1" bare
NOTE: Most wire lengths are longer than needed to reach
3/4" bare
1-1/4" white
their terminating points. Therefore, use square corners (bent
3/4" bare
1-1/4"white
90 degrees) when you position the wires to make the kit as
neat as possible when it is completed.
( ) Connect an 8" white-red wire from lug 10 of switch B
(S - l), through clamps AC and AD, to lug 5 of switch
( ) Connect a 1" bare wire between lugs 3 (NS) and 6
K (S-l).
(S·l) of control S.
Connect a 9" brown wire from lug 11 of switch B
( ) Connect a
1-1/2" white wire between lugs 5 (S-l) and
(S-l), through clamps AC, AE, AF, and AG, to lug 3
7 (S-l) of con trol S.
of control S (S-2).
NOTE: Use the switch lug numbering drawing of Pictorial 5
for help in identifying the pushbutton switch lugs in the ( ) Connect a 6" white - violet wire from lug 3 of switch B
following steps.
(S-l), through clamps AC and AD, to lug 2 of switch
G (S-l).
( )
Connect a 3/4" bare wire from lug 2 of swi tch M (S-l)
to lug 5 of switch N (NS).
Connect a 3" white wire from lug 5 of switch B (S-l),
through clamp AC, to lug 2 of switch D (S-l).
( ) Connect a
3/4" bare wire from lug 2 of switch N (S-l)
to lug 5 of switch P (NS).
( ) Connect one end
of a 12" white-gray wire to lug 2 of
switch A (S-l). Insert the other end through clamps
( ) Connect a
3/4" bare wire from lug 2 of switch P (NS)
AC,
AE, and AF. It will be connected later.
tolug50fswitch R (S-l).
( )
Connect an 8" yellow wire from lug 7 of switch A
NOTE : Where a wire passes through a connection and then
(S - 1), through clamps AC, AE, and AF, to lug 2 of
goes to another point, as in the next step, it will count as
control T (S-l) .
two wires in the solder instructions (S-2) one entering and
one leaving the
connection . Be especially careful, when
( )
Connect a 7" white-green wire from lug 18 of switch B
soldering these connections,
to apply enough solder and heat
(S-l), through clamps AC and AD, to lug 11 of switch
to solder these "through wires."
G (S-l).
1" 2"
3"
4"
5"
6"
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Heathkit IT -3120 Specifications

General

Brand	Heathkit
Model	IT -3120
Category	Test Equipment
Language	English