Yamaha CS-60 Service Manual page 18

VCO
III
IC
(IG00153) WSC
IC (IG00158)
CS60(S/# 1001-
)
This IC
is
used for voltage controlled oscillator.
Many
defferent frequencies are
produced by the
vol-
tage supplied.
1.
FT
2.
KV
Resistor for determination
of the
feet.
The
electric current is
provided to
the pin from transposition changing
circuit so that the
octave can be
determined.
Input of the key voltage
The input of the voltage
is
provided
to the pin
in
corporation with the
keys held
down.
High voltage
High frequency
Low
voltage
Low frequency
Input Voltage Output Frequency
0.250V 130.8Hz
(C2)
0.500V 261.6Hz
(C3)
1.000V
523.2Hz
(C4)
2.000V 1046.0Hz (C5)
4.000V 2093.0Hz
(C6)
Transposition "normal'
3/
VOFF-SET
....
Zero adjustment
of input
4.
buffer
circuit
5.
Vee —15V
input
power
source.
6.
Com
....
Phase compensation
for
input buffer
amplifier.
Normally, the output
(KV
+ 1V)
is
supplied to the pin.
7.
OUT
....
Output
f\
IK
—
7
"
\ \ 3.5Vp-p
As to the frequency,
N
\
i—
refer
to the
Pin
No.
(KV).
8.
GND
Earth
9.
Vref Input of the standard voltage.
10.
CT
Circuit for time constant.
The following wave shape
is
produced.
INNJl
11.
RT
Circuit for
time constant.
RT
Determines the discharging voltage
level.
12.
T1
Input for the comparator.
Input of the wave
shape (|\N
)
is
provided, from the pin no. 14
(TO).
13. Iref
Input of the standard
electronic current
14.
TO Output from
time constant circuit.
f\f\|
The following wave shape
is
produced.
15. VIB Input for vibrato control wave.
Input of the control
wave
is
provided
by
VCO
lever
of SUB-OSC.
16.
Vcc
+15V
input power source.
1.
Vcc +15V
input
power
source
2.
SIO Output of the
sine
wave
s/V.£
3.
TO
Output
of triangular
wave.
AA
W"
4.
SL Input of slice level.
Input of the
DC
voltage
is
provided
to
the pin for determination of the
inverting level which
makes
triangular
wave from sawtooth wave.
Triangular
wave
-Slice level
5.
SO.
^m
Si
Sawtooth wave
Output of the inverter
wave
Output of inverted
sawtooth wave
is
produced.
Sawtooth wave
s>
Inverted
sawtooth
wave
6.
2TO
Output of double triangle
wave
Double
triangle
wave
is
produced
from
triangle
wave.
7.
PO
Output of pulse wave.
"LTL
8.
Vee
—15V
input
power
source.
9. PI Input of pulse
wave
Input of
sawtooth wave
is
provided.
rtTLTL
10.
PWO
Output
of
OP
amplifier.
11.
PWI Input of
OP
amplifier.
l\T\r\
Input of the voltage
is
pro-
I
—
j
I
I
—
i
I
—
| '
vi
ded
for
determination of
I
LLI
LU
Li. the sensitivity of
PWM
lever
|"so that the pulse
width
is
U
U
U
changed.
13.
5T
ing
double triangular wave shape.
Input of triangular
wave
/\/\/
(TO)
is
provided for making
double triangular wave
shape.
...
Input of the pulse
for
producing
in-
verted sawtooth wave.
Input of the sawtooth wave
is
provided
from
VCO
HI
for
producing
inverted saw-
tooth wave shape.
N\N
14. Tl Input of the
wave
is
provided for
producing
triangular
wave
shape.
M
N
\i
15.
STI
Input of the wave for producing
sine
wave.
Input of the triangular wave
(TO)
is
provided
for pro-
ducing sine wave.
16.
GND
Earth
1.
Al
2.
KV
3. fc
4. Vf
5.
Vcc
6.
Q0
.
VCF
IC (IG00156)
Signal
Input
Input signals from
VCO
and WSCare
provided to this pin.
.
Key voltage input
In
order to
change
the
tone
color
according to the
tone range of key-
board, the degignated voltage of the
key will supplied to the pin. (0.25-
4.0V)
Adjustment
of
the cut off frequency.
Set the control currency of the cut
off frequency.
Input of the cut off voltage.
Input voltage of cut off frequency
is
supplied to this pin so that the tone
color can be changed.
The
center
point of the cut off
frequency can be
also set.
When
the
VK
is
0.25V and Vf
is
5V, the cut off frequency
is
set to
just
1KHz.
+15V
input
power
source
Q
adjustment.
The
Q
control current sets the
Q
equal to
5,
when
VQ
is
volt.
7.
VQ.
8.
GND
9.
FB
...
10.
LP
11.
C2
.
12. Vee
13.
BP
..
.
Input of the voltage for
Q
control.
Q
is
variable
according to the control
voltage supplied.
When
the control voltage
is
0V
(Max.),
Q=5
10V
(Min.),
Q=0.5
.
Earth
..
Q
feed back
This
is
the feed
back output
pin for
the
Q
control by which the
Q
is
determined.
...
Low-pass output
-6dB/1V
The output of lower fre-
quencies are
produced.
.
C
pin for determination of the cut
off frequency.
.
—15V power
source.
.
Band-pass output.
-12dB/1V
TU
The
output of intermediate
frequences are
produced.
14.
15.
16.
C1 C pin for determination of the cut
off frequency.
HP
Hi-pass
output
+6dB/1V
The output of higher fre-
quencies are produced.
11.
2DT
IN
Input of feed back
The input
signal
for determination of
cut off frequency.
VCF-EG
IC
(IG00152)
This
IC
generates envelope
wave shape which
is
supplied to
VCF
and control the
tone
color.
1.
NC
Not connected
2.
Bl Input of buffer amplifier.
3.
OUT
....
Output of buffer amprifier.
The buffer amplifier
is built in
for
the purpose of matching inpedance.
Output wave
shape
KEY-OFF
4.
GND
....
Earth
5.
Vcc +15V input power source.
6.
G1 Gate
1
7.
G2
Gate 2
~T\
cry
G2~L
i
r
AT
starting data
Key
ON-OFF
data
8.
Vee
—15V
input power source.
9.
AT
Input of buffer voltage for determi-
nation of the attack time.
Input of the voltage between zero
V
and
10V
is
provided and the attack
time
is
controlled
from
1
mS
until
1S.
)*AT-
'
10.
1DT
Input of buffer voltage for determi-
nation of the
decay time.
Input of the voltage between zero
V
and
10V
is
provided
and
the first
decay time
is
controlled
from
10mS
until
10
S.
,1DT
Input of buffer voltage for
determi-
nation of the release
time.
Input of the voltage
between
zero
V
to
10V
is
provided
and
the
time
from
KEY-ON
until release
is
con-
trolled
from 10m second
until
10
second.
KEY-OFF
12.
TC
2DT
(R)
Output of the time
control.
Output of
DC
voltage
is
produced
so that the each time of attack,
1
DT
and
2DT
are controlled.
i
A!
! '
i
/
v
i i
Time
control
voltage
T\:
The
higher the voltage, the shorter the time and
the lower the voltage the longer the time.
13.
LC
Output of
level control.
+5
y ^^ Output of
DC
voltage
in produced so that
the
AL
and SL
is
-5V
level
control
voltage
The
higher the voltage, the higher the
level
and
the lower the voltage the
lower the
level.
14.
AL
Input of butter
voltage for determi-
nation of attack
level.
Input of the voltage between (0V~
10V
is
provided
and the attack
level
is
controlled from
0V
until
+5V.
15.
SL.
Input of buffer voltage
for determi-
nation of the
sustain level.
Normally fixed to zero(0)
volt.
+5V
J
*--5V
16. IL Input of buffer
voltage for determi-
nation of the
initial level.
Input of the voltage between zero
0V
and
ten
10V
is
provided and the
initial
level is controlled
from
zero to
minus
5 volt.
-B-l
-16