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Akai GX-2800D-SS

Akai GX-2800D-SS
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—--——
LOW
SPEED
3-3/4ips
——-—
HIGH
SPEED
Flow
of
braking
current
—_—""
to
Servo
Coil
SS
FREQUENCY
(Hz)
Fig.
36
6.In
case
of
the
capstan
motor
revolutions
having
reached
the
speed
of
nz,
the
detector
signal
pro-
duced
at
the
detector
coil
surpasses
fy
and
advances
toward
the
higher
f,
frequency.
(See
Figs.
36
&
37)
Accordingly,
the
flow
of
current
to
the
servo
coil
increases,
and
because
the
electro-magnetic
braking
supplied
to
the
capstan
motor
is
increased,
the
capstan
motor
revolutions
become
slower,
and
nor-
mal
revolutions
are
regained.
-In
case
of
the
capstan
motor
revolutions
having
*
slowed
to
n,,
the
detector
signal
produced
at
the
detector
coil
drops
to
lower
than’f,
and
descends
toward
the
low
f,
frequency
(See
Figs.
36
&
37).
Accordingly,
the
flow
of
current
to
the
servo
coil
decreases,
and
because
the
electro-magnetic braking
supplied
to
the
capstan
motor
is
decreased,
the
capstan
motor
revolutions
speed
up
and
normal
revolutions
are
regained,
Flow
of
braking
current
="
to
Servo
Coil
——---——
LOWSPEED
7-1/2
Ips
———~-——
HIGH
SPEED
Q;
aaa
FREQUENCY
(Hz)
Fig.
37
8.
To
obtain
the
proper
number
of
revolutions,
adjust-
ment-
of
the
flow
of
brake
current
to
the
servo
coil
is
necessary.
“1)
At
3-3/4
ips
tape
speed
As
shown
in
Fig.
36,
resonance
frequency
f,
(between
the
arrow
mark)
is
changed
by
adjusting
the
dust
core
of
discriminator
coil
L1
(V12031SC-
01).
Accordingly,
fy
is
also
changed
between
f,
and
fy,
and
the
flow
of
braking
current
(i)
to
the
servo
coil
is
also
changed
between
i,
and
iz.
Consequently,
correct
tape
speed
can
be
attained
by
using
a
tape
speed
measuring
tape
and
a
Frequency
Counter
and
adjusting
the
dust
core
of
coil
LI.
2)
At
7-1/2
ips
tape
speed
|
As
shown
in
Fig.
37,
Q,
of
the
resonance
circuit
(within
the
arrow
mark
with
f,
as
center
fre-
quency)
is
changed
by
adjusting
discriminator
semi-fixed
resistor
VR202
(5
kB).
Therefore,
f,
is
also
changed
between
f,
and
f,
and,
the
flow
of
current
(i,)
to
the
servo
coil
is
also
changed
between
i,
and
iz.
Consequently,
correct
tape
speed
can
be
attained
by
using
a
tape
speed
measuring
tape
and
a
Frequency
Counter
and
adjusting
semi-fixed
resistor
VR202.
27

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