Yamaha CS-60 Service Manual page 19

CS60(S/# 1001-
)
VCA
IC (IG00151)
.
Input voltage for level control.
Input of the control voltage
is
pro-
vided for changing the level
expotenen
tially.
OdB
Fixed
2.
LI Input of level control voltage.
Input of the control voltage
is
pro-
vided for linear
change of the
level.
Input
wave
-shape
dB
3.
+IN Input
Input of the level modulated signal
is
provided.
INPUT OUTPUT
From Ll^l
/VCA-EG
\
4.
—IN
Negative feed back.
Normally unused.
5.
Vee
—15V
input power source.
6.
Vcc +15V
input
power
source.
7.
GND
Earth
8.
OUT
Output
Output of the following
wave
shaj
is
produced.
For
checking,
connect
the
resistor of 10K*~30K
ohm
as illustrated.
VCOE
IC
(IG00150)
VI Input of the control voltage.
The frequency
is
variable in accord-
ance with
the voltage supplied.
VCJ
100
K
Input of the
voltage 0-10V
is provided.
GND
Earth
©-VV
o
VI
t
°
o
VCOD
3.
C
Capacitor for
determination of the
frequency.
4.
Vee —15V input power source.
5.
Vcc +15V
input
power
source.
6.
SIO Output of sine wave.
/~\
y
^
3.20 VPP
7.
SO Output of sawtooth
wave
sx
3.5Vpp
.
Setting for standard electric current.
The standard electric current
is
set
so as to be the
output 200Hz when
VC1
is
10V and
VC2
is
zero volt.
VCA-EG IC (IG00159)
This IC generates
envelope wave shape which
supplied to
VCA
and control the
tone volume.
1.
|L
Input of
initial level.
Fixed to
0V
OV.-t
2. Bl
Input of buffer amplifier.
3.
OUT
.
The buffer amplifier is built in for
the purpose of
matching inpedance.
Output
wave shape.
1DT
-AT
3
4.
GND
Earth
5.
Vcc +15V input power source.
6.
G1
Gate 1
7.
G2 Gate 2
KEY-ON
0V
G1
—
KEY-OFF
T\
Y
AT
starting data
r«
Key
ON-OFF
data
Vee
+15V
input
power source.
AT
Input of buffer voltage for
determi-
nation
of
attack time.
Input of the voltage
between zero
V
and 10V
is
provided
and the attack
time is
controlled from
1
mS
until
IS. KAT-*
10.
IDT
Input of buffer voltage for determi-
nation of decay time.
Input of the voltage
between zero
V
and 10V
is
provided and the
decay
time is
controlled from 10
m
second
until 10 second. }•
—
*|lDT
X
11.
2DT
Input of buffer voltage for determi
nation of release time.
Input of the voltage
between zero V
and 10V
is
provided and the time
key-off until
I
release is
controlled
from 10
mS
until 10 S.
H2DT
(R)
^
12.
TC Output of time control.
Output of the
DC voltage
is
pro-
duced so that the each time of
Attack, 1st
Decay and 2nd Decay are
controlled.
KEY-ON
i
OFF
1st
DT
2ndDT
The higher the voltage,
the
shorter the time and the
lower
the voltage, the lon-
ger the time.
13.
LC Output of level control
Level
control
j.
voltage
f
L
7iu\
10
Output of the
DC voltage
for
AL
and SL control
is
provided.
The higher the voltage
,
the
higher the level
and the
lower the voltage, the lower
the level.
14.
NC
Not connected.
15.
SL
Input of
buffer voltage for determi-
nation of the sustain level.
Input of the voltage between zero
V
and
10V
is
provided
so
that the
sustain level can be controlled. —
10
3=SI
16.
NC Not connected.
Pitch
Adjustment
"Before earring out pitch adjustment, be sure to stabilize electrical circuits of your synthesizer
more
than 10 minutes after power switch
is
turned on.
1.
Adjust the following variable
resistors,
when
tuning knob on the panel
is in
the center position, so that the voltage of
TU
terminal
is
+4V ±
0.1% between the terminals
TU
(67) and E on
KAS
circuit board.
5.
CS-50
CS-60
CS-80
Circuit
Board
SUB
SUB
BA
VR
No.
VR11
VR14
VR3
B-200J2
B-100KS7
B-100KS2
*Make
sure, all the levers
on
the panel are in
"OFF"
position.
Short circuit terminals
EK
(19)
and E
(1)(2)
on
M
circuit
board when tone selector
is
set to
"FLUTE"
and
transposition lever
is
in
OCT-UP
(2'
on
CS-80) (+15V, terminal VIII on
M
circuit
board) position. Then, adjust
VR1
(B-10K) on
M
circuit
board so that
the voltage of terminal
Cp
(5) is
within
0V
±120/jV.
With checking
the
output frequency from
the 9th pin of IC9
(WSC) on
M
circuit board, adjust the
VR3
(B-5K) to have the certain
highest note.
CS-50,
60
C7 to be
4186 Hz +
1
cent when C6 key
is
depressed.
CS-80 C8 to be
8372 Hz ±
1
cent
when C6
key
is
depressed.
In the
same manner,
set the lowest note by adjusting the
VR2
(B-500) as follows.
CS-50 C3
to be 261 .6Hz
±
1
cent
when C2
key
is
depressed.
CS-60 C2
to be
130.8Hz ±
1
cent
when
C1 key
is
depressed.
CS-80 C3
to be
261.6Hz ±
1
cent
when
C1 key
is
depressed.
Note:
(1
)
You
can
easily find
out which
M
circuit
board
is
corresponding
to the
key
depressed
by
hearing the subtle change of the
tone with
hum
modulation when you
are adjusting
VR2
on
A M
circuit board.
(2)
The order the
possible
sounds when keys
are
depressed
in turn
is:
©
+
©
+
©
+
©* ©
+
© *® *©
When
keys
are
depressed
at a time: ©+©*©*©*©>©
+
©+©*©
Therefore, when you
adjust the
M8
circuit board, depress the 8th
key
while 7th
key
is
holding
down,
then release the 7th
key. In this
way, you can take out
the
sound
of 8th
key
depressed.
Adjust the following variable resisters,
when
transposition lever
is
in
"NORMAL" ("4'" on CS-80)
position
(+15V
at terminal
IV) as below.
CS-50,
60 VR4
(B-1K);C6 to be
2093Hz ±
1
cent
when C6
key
is
depressed.
CS-80 VR4
(B-500):
C7
to be
4186Hz ±
1
cent
when C6
key
is
depressed.
Adjust the following
variable resistors,
when
transposition lever
is
in
"1
OCT-DOWN"
("8"'
on
CS-80) position
(+15V
at terminal
II) as
below.
CS-50, 60
VR5
(B-2K);05
to be
1046Hz ±
1
cent
when C6 key
is
depressed.
CS-80
VR5
(B-1 K);
C6
to be
2093Hz ±
1
cent
when C6 key
is
depressed.
Likewise, adjust the followings, when
transposition lever
is
in
"2 OCT-DOWN" ("16' "
on CS-80)
position
(+15V
at
terminal
I)
as
below.
CS-50, 60
VR6
(B-5K);
C4
to be
523.2Hz ±
1
cent
when C6
key
is
depressed.
CS-80
VR6
(B-2K);C5
to be
1046.4Hz ±1
cent
when C6 key
is
depressed.
Finally, adjust the generating circuit for tuning standard voltage, when A3 key
is
depressed, so that the
output
is
443 Hz.
Circuit Board
CS-50
SUB
CS-60
SUB
CS-80
BA
Mcircuit Board
PITCH
,
ADJUSTMENT—
VR. No.
VR11
VR14
VR3
CS-50 SUB
Board CS-60 SUB Board
B-200
Q.
B-1
00
£2
B-100KJ2
.JX
r3
nEij VR
5 c£Eb
cS
cEij
cSVBlfcgj
VR2 VR4 VR6 VR11VR12VR13
VR21
VR3
VR18 VR20 VRJ7
VR7 VR8 VR9 VR10VR19VK15"
"
VR16
"
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3 <==? <=^*
•^
==? "SI C^J
17