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Technics ST-9600 - Page 5

Technics ST-9600
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VOR
DEM
ABGLEICH
SORGFALTIG
DURCHLESEN
SKALENZEIGER-
EINSTELLUNG
DES
ANGEIGE
SCHALTUNG
FREQUENZ
|
EMPFANGERS
(ROHRENVOLTMETER
ODER
OSZILLOGRAPH)
{ABSTAND]
ABGLEICH
BEMERKUNGEN
FM
HF-ABGLEICH
Anschiuf
an
den
FM
Antennenanschlu&
87.5MHz
uber
die
kunsiliche.
|
(100%
Mod
FM
Antenne
bel
400Hz)
(Vgl.
Abb.
1)
Output
meter
Uber
Lautsprecher-
:
Auf
max.
Ausgan
schwingspule
anschlieRen.
Ea
tOncillatorspale)
abgleichen
a
L4
(Zwischenkreis)
(S)
L3
(Zwischenkreis)
(P)
L2
(Antennenspule)
(S)
L1
(Antennenspule)
(P)
CT1
(ANT.
Trimmer)
(P)
_y
CENTER
EQUENCY
POINT
fe
iP
Be
To
Tuner
Meter
1K
MUTING
IF
FREQUENCY
VR601
~~
CURVE
A~B,D—E:
Stereo
OFF
Position.
1F
FREQUENCY
CURVE
6-D:
Stereo
ON
Position
(indicator
Lighting).
Cc:
Adjust
Point
of
Pilot
Circuit.
5
\
1
1
1
'
To
Output
|
|
1
J
r-|-------
LOW
PASS
FILTER
(for
=
15kHz
~
19kHz)}
2.
Automatic
High-Blend
Circuitry
This
circuitry
is
designed
to
reduce
noise
in
FM
stereo
broadcasts,
especially
thatnoise
=
"row
Reh
heard
during
reception
of
weak
signals
8
|
e
from
the
broadcasting
station,
and
thus
g
ae
Right
Output
making
FM
stereo
broadcasts
more
plea-
—s
|§
sant
and
easier
to
hear,
This
‘‘high
blend”
circuitry
operates
automatically,
if
the
in-
put
signal
is
below
a
certain
specified
level,
as
controlled
by
an
electronic
switch.
(See
figure
7.)
In
general,
the
noise
component
of
a
signal
is
at
a
high
level
in
the
high-frequency
range;
and,
because
the
reverse-phase
noise
of
the
left
and
of
the
right
FM
signals
Fig.
7
received
by
the
multiplex
circuitry
be-
TRUZ
To
Muting
AND
Circuluy
Lh
(Automatic
High-Blend
Circuitry)
comes
mutually
mixed
with
each
other,
the
high-frequency
ranges
of
both
channels
become
blended
and
the
noise
components
cancel
each
other,
thus
giving
this
circuitry
the
name
‘hi
blend"
circuitry.
When
input
signals
are
weak,
the
circuitry
is
designed
so
that
TR521
will
not
function,
and
positive
B
voltage
is
applied
to
the
collector
of
TR521.
Positive
and
negative
B
voltages
are
separately
applied
to
the
gate
of
TR523,
and,
if
the
positive
voltage
is
high,
TR523
is
in
the
operating
condition.
In
other
words,
the
hi-blend
switch
will
change
to
the
“on”
condition.
Lett
Ourpur
Fig.
3
Fig.
4
Fig.
5
Then,
when
an
input
signal
which
exceeds
the
muting
level
(30
dB)
is
received,
bias
begins
to
be
applied
to
TR521.
When
this
happens,
the
collector
becomes
the
grounding
potential,
and,
because
the
voltage
becomes
negative
and
the
gate
of
TR523
becomes
open,
the
“hi-blend"’
switch
becomes
‘‘off.’’
TR522
and
TR521
are
transistors
provided
to
UNA
Me
anAURt
ta
oANN
AA
NNeee-Ad
EEN
sent
ct
ae
eam
Agha
aU
ADH
AUt-oA
NA
Lt
vedhdnoeMaoRA
DU
se
ob
taal
tea
-<UUN
to
oAdout
be
oaRE
AL
aA
UMN
oN
Bae
Ahan
Nes
MDM
de
AYER
tee
Ago
-y
ALUM
-ea
gS
-stb
ldo
-efgoARNN
SOL
aL
tata
@
SERVICE
AID
1.
Muting
Circuitry
.
:
.
A
NARROW-BAND
SIGNAL
The
muting
level
of
this
model
is
electable
in
two
steps.
There
are
three
positions
of
the
muting
switch:
‘‘on,”
“off”
and
“deep.”
This
circuitry
is
designed
so
that
when
the
|
muting
switch
is
moved
from
the
‘’on'’
position
to
the
“deep"’
position,
the
muting
circuitry
will
then
operate
at
an
input
level
which
is
about
20
dB
larger
than
the
level
at
the
|
ane
TREO2
caciiey
“ton”
position.
on
(1488)
The
principles
of
this
circuitry
are
as
follows.
Utilizing
the
WIDE-BAND
SIGNAL
AND
circuitry
consisting
of
TR501
and
TR502,
the
FM
IF
signal
from
terminal
(5)
of
1C103
passes
from
TR251
and
through
the
IFT
for
muting,
thus
becoming
a
narrow-band
signal,
and
is
apptied
to
TR501.
Meanwhile,
the
FM
IF
signal
from
terminal
(1)
of
1C101
passes
from
TR201
through
the
control
circuitry
of
CF201
and
CF202,
and
is
applied
to
TR502
as
a
wide-band
IF
signal.
The
muting
circuitry
operates
in
the
following
way.
TR503
operates,
and,
in
order
to
cause
the
output
relay
of
the
AF
circuitry
to
operate,
the
signals
applied
to
both
TR501
and
TR502
overlap
each
other.
The
reason
that
the
AND
circuit
consists
of
TR501
and
TR502
is
in
order
to
combine
the
signals
of
both,
and,
even
if
one
of
the
transistors
operates,
the
muting
circuitry
will
not
operate.
(Muting
AND
Circuitry)
Fig.
6
In
addition,
in
order
for
the
muting
level
to
be
selectable
in
two
steps,
the
level
of
the
wide-band
signal
applied
to
TRS502
can
be
changed
by
a
switch
(S3-1),
and
the
selection
is
made
according
to
the
change
of
the
operation
level
of
TR502.
ST-9600
make
this
operation
quick.
3.
“Pink-Noise’’
Circuitry
Because
the
level
of
“white
noise’
of
discrete
output
is
high
in
the
high-frequency
range,
it
can
be
used
for
determination
of
the
recording
level,
when
recording
an
FM
broadcast,
by
making
the
frequency
response
flat.
(See
figure
8:)
Chessentiriie
Pink
Noise
-3d8/oct
4B
48
(
re
ee
ee
|
—
Ff
—-fF
——
f
o
SI-é
yR105
R_
rape
2
rkKy
REC
OUT
TRI04
yeting
H
‘
TAPE
305
R35
one]
15K
REC
OUT
OUTPUT
OUTPUT
(Pink
Noise
Circuitry)
Fig.
8
ST-9600
Sage
doce

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