Hitachi FT-4000 - Disassembly and Replacement

7.
A
Ceramic
Filter,
(C
in
AM
Tuner
A
ceramic
filter
is
employed
in
the
AM
tuner
to
obtain
sive
use
of
IC
enables
stable
reception
to
be
achieved.
8.
Two
Extra-Wide
Meters
and
a
Large-sized
Fly-wheel
Tuning
knob
Two
easy-to-read
meters
are
used
for
signal
and
tuning.
A
dial
mechanism
employs
a
large-sized
fly-wheel
with
a
high
moment
of
inertia
for
easy
operation
RECEIVING
BROADCASTS
1.
Receiving
FM
Broadcasts
(1)
Set
the
FUNCTION
switch®
to
FM.
(2)
Set
the
MODE
switch@
to
AUTO MUTE
ON
(0).
In
this
position,
interstation
noise
can
be
cut
out.
(3)
Tune
to
the
station
by
turning
TUNING
knob
@.
The
SIGNAL
meter
@)
needle
should
make
the
biggest
deviation
to
the
right
and
the
TUNING
meter
@)
needle
should
be
central
for
precise
tuning.
See
the
figure
below.
(4)
When
FM
stereo
is
received
the
FM
STEREO
indicator @) lights up.
CAUTION:
When
input
signal
from
antenna
is
low
in
an
area
where
the
radio
waves
are
weak,
broadcasts
some-
times
cannot
be
received
when
the
MODE
switch
@
is
set
to
MONO
(2).
o 1234 5
=
SIGNAL
te
~~
__
Tuning
a
How
to
use
“MPX
NOISE
FIL”
switch
When
broadcasting
waves
are
particularly
.weak
and
also
accompanied
with
‘‘noise’’,
the
MPX
Noise
Filter
switch
damps
the
noise
level
by
blend-
ing
the
high
frequency
range
of
the
incoming
left
and
right
channel
stereo
signals,
thus
cancelling
out
any
negative
phase
noise.
The
result
is
significantly
better
in
signal-to-noise
ratio.
Antenna
Connection
When
the
FM
feeder
antenna
provided
is
used
This
FM
feeder
antenna
is
sufficient
to
receive
broadcasts
in
an
area
near
to
the
broadcasting
station
where
the
radio
waves
are
strong.
Connect
the
FM
feeder
antenna
provided
to
the
antenna
terminal,
and
with
the
antenna
extended
in
a
T-
shape,
install
it
in
the
most
sensitive
position
(where
reception
is
best).
eee Caer
FM feeder ||
antenna ANTENNA
(provided) a eM 5,
10
[ohms [ ohms |
GND
high
selectivity
and
AGC
characteristics.
The
exten-
Outdoor FM antenna
When
using
this
tuner
far
from
the
broadcasting
station
or
behind
a
ferroconcrete
building
where
the
radio
field
strength
is
low,
install
an
outdoor
FM
antenna.
Then
height
and
direction
of
the
outdoor
antenna
should
be
adjusted
for
the
opti-
mum
reception.
°
When
the
distance
between
the
antenna
and
this
tuner
is
over
30
meters
(around
100
feet),
or
in
areas
subject
to
heavy
traffic
or
close
to
a
high-
tension
power
line,
noise
may
disturb
listening
even
when
the
FM
exclusive
antenna
is
used.
In
this
case,
use
a
75-ohm
coaxial
cable
for
the
feeder
line.
However,
since
this
coaxiable
cable
is
a
‘“75-
ohm
unbalanced’’
type,
install
a
matching
trans-
former
between
the
antenna
and
the
coaxial
cable
to
prevent
wave
loss.
When
this
conversion
transformer
is
incorporated
in
the
antenna,
a
normal
75-ohm
coaxial
cable
can
be
used.
FM outdoor antenna
Direction from which
radio waves come
300 ohms
' 75 ohms
feeder line
coaxial cable
ad
—
/
Pa ~
per een nee n nen nnn
end
a
‘S.
eee
een
n
2. Receiving AM Broadcasts
(1)
Set
the
FUNCTION
switch
©
to
AM.
(2)
Tune
the
desired
station
with
the
TUNING
knob@),
while
watching
the
SIGNAL
meter@®.
Maximum
deviation
of
the
meter
needle
to
the
right
indicates
the
best
tuning
point.
Ferrite Bar Antenna
When
this
set
is
used
in
a
location
near
a
broad-
casting
station,
the
built-in
ferrite
bar
antenna
will
give
optimum
reception.