1976-7-30
SYSTEMIOO-IOI
2-3. VGA is a
voltage
controlled amplifier,
haying
its
gain controlled
by
the
voltage
supplied
from ADSR,
LFO
and
applied
on
its current
source
transistor.
2-4.
Envelope
Generator
produces
the
ADSR triggered
by
the
keyboard gate
voltage, the
positions of the four
sliders
in the
ADSR
section
determine
the
steepness of the
curves of each section
and
level of
the
envelope.
2-5.
Noise
Generator is
using,
as its
sound
source,
white noise
appearing upon
the
junction
of the
reverse
biased
transistor, and
on
use,
by
further
amplifying such noise.
2-6. LFO is a
low
frequency
oscillator
for
use
of modulation, whh the
Sine
Wave,
Sawtooth
and Square
Waves
for
modulation
of VCO,
VGF
and VGA,
while
Triangular Wave for Pulse Width
modulation.
2-7. Head-Phone
Amplifier
provides A-class
amplified signals through
Its
output
transformer.
>
2-8.
Mixing
Amplifier
mixes
the
signals
from VCA with that of A-440 Hz
Standard
Oscillator, thus providing
the
output
of tfie
mixed
signals
from
here.
3.
A-440
HZ
OSC
BOARD ASSEMBLY
(OP-30)
This
circuit is a
very
stable
LC Oscillator.
4. POWER
SUPPLY
BOARD
ASSEMBLY (OP-22, OP-24)
The assembly is a
voltage
regulator
circuit, to provide
the
constant voltages of -I-14V
and —14V, and in
order
to
assure
of such precise
voltage
an
adjustable trimmer potentiometer is
incorporated.
Note:
The
board PS-22
is
for
100V
-
200V, while PS-24
for
220V
-
240V.
Fuse 0.5A,
Fuse
Holder
TF-758, of
Label
No.
69,
are
to be used on PS-24 alone.
For PS-22, use
such
ones
having
jumper
wire on
Fuse Holder.
1976-7-30
SYSTEMIOO-KJI
CONTENTS
1.
SPECIFICATIONS
^
2.
PANEL DIAGRAM
3. DISASSEMBLY
'
5
4. GENERAL
LAYOUT
g
5. CIRCUIT
DESCRIPTION
^
6. GENERAL
BLOCK
DIAGRAM
_
7. SEMICONDUCTOR
ELECTRODES
g
8.
PRINTED
CIRCUIT
BOARD
ASSEMBLY PARTS
LAYOUT
AND
CIRCUIT
DIAGRAM
8-1.
VCO-4
VCO
BOARD
.,q
8-2.
OP-27
VCF-VCA
BOARD
^2
8-3.
OP-30
A-440HZ
OSC
BOARD
^4
8-4.
PS-22,
PS-24
POWER SUPPLY
BOARD
9. WIRING
DIAGRAM,
,
.,g
10.
ADJUSTMENT
11. PARTS
LIST
32
12. PARTS
PICTURE
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