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Eico HF-20 Instruction Manual page 11

High fidelity

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SWITCH WIRING
(
)
Fig.
2.
Connect on
850mmf
capacitor,
C19, and
a
100K
5%
resistor,
R34, from IB
(S) to
1C
(S).
(
)
Fig.
2.
Connect a
500mmf
capacitor,
C20, and a 100K
5%
resistor,
R35,
from
5C
(S) to
5B
(S).
(
)
Fig.
2.
Connect a 5000
mmf 10%
capacitor,
Cl
8,
and a
4.
7
meg
resistor,
R36, from
7C
(C)
to
8A
(S).
(
)
Fig. 2.
Connect
a2700mmf
capacitor,
C21
,
anda
2.2
meg
resistor,
R38,
from
8D
(S)
to
9B
(S).
4
(
)
Fig.
2.
Connect a 3300
mmf
capacitor,
C17, and a
560K
resistor.
R37,
from
1
ID
(S)
to
11
A
(S).
(
)
Fig.
2.
Connect a
blue lead from
4D
(S)
to
7C
(S).
(
)
Fig.
2.
Connect a
2" blue
lead
to
12C
(S).
Leave
the other
end
free.
(
)
Fig.
2.
Connect one
end
of
a
Jmfd 20%
capacitor,
C25,
to
2D
(C).
This
lead should
be
only
1" long.
Leave
the other
end
free.
(
)
Fig.
2.
Connect a
bare
lead from
2D
(S) to
3E
(S).
(
)
Fig.
2.
Connect a
2" blue
lead from
10E
(C)
to
6E
(S).
(
)
Fig.
2.
Connect
a 5" pieceof bare wire
to
8F
(C).
Leave
the other
end
free.
(
)
Fig.
2.
Cut
four
5" length of shielded cable.
On one
end ofeach,
strip
back
the
braided
shield
and
outer
insulation
3/4"
.
Strip
back
the inner insu-
lation
3/8".
(Call
this
end "A".)
On
the other
end
of
each
(end
n
B"),
the
outer insulation
is
stripped
back
1", the braid shield
3/4",
and
theinnerin-
su lotion
3/8"
.
(
)
Fig.
2.
Connect
the inner leads of
theffour
cables (end "B"), so
that
one
connects
to
each
of the following
four
switch
terminals:
(
)
IF
(S)
(
)
2F
(S)
(
)
1
1F
(S)
(
)
12F
(S)
(
)
Fig.
2.
Cut a
5" piece of bare wire.
Wrap
this
wire
one
turn
around
the
exposed
outer braid
on
the "B"
end
of
each
of the shielded cables
now
connected
to
2F,
IF, 12F,
and
1 1
F consecutively
and
in that order,
leaving
3/8"
of
bare wire
between
wrappings.
Solder the bare
to
the outer braid
on
each cable
quickly with a
hot,
clean
iron so as to
minimize
heating of the
cable
insulation.
Connect
the free
end
of the bare wire (coming
off the braid
of the
cable connected
to
1
IF) using spaghetti,
to
8F
(S).
(
)
Fig. 2.
Cut
a 6"
length of shielded cable.
On one
end,
strip
back
the
braided
shield
and
outer
insulation
3/4"
.
Strip
back
the inner insulation
3/8"
.
(Call
this
end "A".)
On
the other
end
(end "B"), the outer
insulation
is
stripped
back
1"
the braided
shield
3/4"
and
the inner
insulation
3/8".
On
end
"B",
wrap one
turn
of
a 2" piece
of bare wire around the braided
shield
and
solder
with
a
minimum
of heat.
Connect
the inner
leadtf end
"A"
to
10E
(S).
Leave end "B" and
the small
piece
of
bare wire
free.
SI
R35
C20
Fig.
»

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