Vcf Circuit Board & Wiring (Vcf->- 1**50).10 - Yamaha CS-30 Service Manual

VCF
Circuit Board & Wiring
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a wk
• m*rk : CS 301 only
* m*/k :CS-30oniv
View from the printed pattern side of the circuit board
(Note)
1. 1C
IC1,2 : IG00156
IC3.4 : NJM4558
2. Resistor
® marks : ± 1 %
R1R2R3R4: Rank of IC1,2
1C Rank R1R2 R3R4
/
Q
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1?
IXT
CXT
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S/H
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3
0
- Q
1
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KEP-NA 80290-78A
CS-30(S/# 1001—)
VCF-EG (IG00152)
This 1C 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
T 7 " '
AL 1
-H-v
It:/
KEY-ON
- AT -w««DT*,
-H I
SL
KEY-OFF
4. GND .... Earth
5. Vcc . +15V input power source.
6. G1 .Gate 1
7. G2 .Gate 2
8. Vee
9. AT
AT starting data
Key ON-OFF data
-15V input power source.
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
IS.
ur AT
0
10. DT 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.
IDT
11. RT
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 10 m second until 10
second.
KEY-OFF
12. TC . Output of the time control.
Output of DC voltage is produced
so that the each time of attack, DT
and RT are controlled.
I A ! 11
Time
control
voltage
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 IL and AL is
-5V
level
control
voltage
+5V
-0
- —5V
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
-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.
-10-