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Heathkit SB-220
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csi*e:*-w*=
-1
page
49
Refer to Pictorial 4-1 1 for the following steps.
(,,/'prepare the following lengths of large black stranded
-
wire:
4-1 12"
13-112"
13-112"
NOTE: DIODES MAY BE SUPPLIED IN ANY OF THE FOUR
SHAPES SHOWN IN THE FOLLOWING ILLUSTRATION. THE
CATHODE END OF THE DIODE IS MARKED WITH A BAND
OR BANDS. THIS END SHOULD ALWAYS BE POSITIONED
AS SHOWN IN THE PICTORIAL WHERE IT IS INSTALLED.
Detail
4-1
1A
(4
Install a large connector tab (#432-137) on =end of
each of the three wires.
(Vl
Connect a 33 kS2 (orange-orangeorange) resistor from
-
lug 1 (NS) to lug 2 (NS) of terminal strip BT.
J
(fl
Connect a 22 kS2 (red-red-orange) resistor
from
lug 2
(
1
Push the tab on'the 4-112" wire onto lug 4 of switch
(S-3) to lug 5 (NS) of terminal strip BT.
AN.
((1
Connect the positive
lead
(marked
+)
of a
20
pF
(6
Push the connector tab on one of the 13-112" wires
electrolytic capacitor to lug 5 (NS) and the other lead
onto lug 1 of switch
2,
and the connector tab on the
to lug 1 (S-3) of terminal strip BT.
other 13-1 12" wire onto lug 2.
(4
Connect the black stranded wire coming from
(J(
Prepare a 12-112" length of
&
black stranded wire.
grommet AL to lug
5
of relay
F
(S-1).
(4
Connect a 3"
red
hookup wire from lug 2 (NS) to lug
J
11 (S-1) of the relay.
(
Connect the free end of the black-yellow wire coming
from grommet AK and one end of the 12-112" wire in
(VJ
Connect a 9-112" length of red hookup wire from lug
the preceding step to one large tab connector ($2).
5 of terminal strip BT (S-4) to lug 2 of the relay (NS).
Then push this connector tab onto lug 3 of switch AN.
~XConnect the free end of the black-red lead coming
from grommet AK and the free end of the black wire
coming from lug 4 of switch AN to one large tab
connector 6-21.
Push
this tab onto lug 4 of switch
2.
Detail
4-118
(4
Refer to Detail QllB and form a 1-114"
length
of
The
free
ends of the "tabbed" wires in the preceding steps
bare wire as shown.
will
be
connected later.
I
4''
Connect the bare wire from lug
1
6-1) to lug 3 ($1)
of relay
F.
(
t/)
Refer to Detail 41 1
A
and connect the cathode lead of
a silicon diode (#57-27) to lug 5 (NS) and the anode
(4
Connect the blackgreen transformer lead
fmm
lead to lug 4 6-21 of terminal strip BT.
grommet
Y
to lug 3 of terminal strip
AE
62).

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