Technics SL-23-X - Page 2

BLOCK
DIAGRAM
OF
THE
F-G-SERVO
*
The
output
frequency
which
occurs
at
the
F-G-
section
is
in
proportion
to
the
rotation
of
the
motor.
And
this
output
frequency
is
amplified
and
converted
to
rectangular
wave
at
pulse
shaping
circuit.
*
This
wave
is
converted
to
trigger
pulse
and
converted
to
rectangular
neving
constant
amplitude
and
constant
time
base
of
Ts.
*
This
rectangular
wave
is
in
proportion
to
the
rotation
of
the
motor,
too.
*
At
next
integrating
circuit.
this
wave
is
converted
to
DC
voltage
Ti.
This
circuit
controls
the
rotation
of
the
motor
by
changing
the
voltage.
If
the
speed
of
the
motor
is
fast
than
standard
speed,
then
the
output
frequency
of
the
F-G-section
becomes
higher
so
that
the
periodic
time
T
of
the
constant
time
base
becomes
narrow,
too.
Thus
the
DC
voltage
Ei
will
be
increased.
The
rotation
of
the
motor
is
in
proportion
to
DC
voltage
Ei.
At
voltage
comparator,
DC
voltage
Ei
is
compared
with
refference
voltage
Es/n
which
is
supplied
through
refference
voltage
reising
circuit
and
divider.
If
the
DC
voltage
Ei
is
higher
than
refference
voltage
Es/n.
This
DC
voltage
will
be
controled
to
decrease
the
rotation
of
the
motor,
and
if
lower
than
Es/n,
DC
voltage
Ei
will
be
controled
to
increase.
*
At
phase
compensating
circuit,
to
get
more
stable
and
accuracy
rotation
of
the
motor
is
feedbacked
the
only
AC
component
of
the
output
signal
from
the
motor
driving
circuit
to
the
voltage
comparator.
BLOCK
DIAGRAM
OF
THE
F.G.
SERVO
)
:
.
T
a
Te
T
a
Ts
Phase
com-
EL
aw
Ah
Ch
Je
ih
puss
Gare
pensating
&
Rectangu:
Trigger
plus
Integrat-
DC
drivi
r
wave
;
riving
Bical
circuit
ing
circuit
amplifier
circuit
F.G
(Frequency
Generator
)
/
Refference
/
.
voltage
E's
/
raising
Driver
/
/
circuit
1/n
/
Constant
time base
generator
compara-
tor
[2] SL-23-(x)