Korg MS-20 Service Manual

KORG
MS-20
1. SPECIFICATIONS
<
CONTROL SECTION >
t.
Keyboard
*C^C 37 kays
(Socwvas)
2.
Voltage controtfed
•Scale
(32'.
b\
4'>
(6
o&citlaior
1
ociaves,
+
canL
-
cent)
•
Wave
rofm
(At K *
Pw
{ nj
nj
white noise)
(4
modes]
•
Pulse
widtin
adjust
i
:
1 1
3.
V.C.0-2
•
Scale
(
W, &\
4\
20 (6
ociaves.
+ ceni,
-
cant)
•
Wave
tofm
(
K ,
PL
.
ring
riKxJuietor)
(4
modes)
•
Pitch
(±1
OCTAVES)
4,
rnasier
•MastaMuna (±100
cent)
control
•
Portamento (max. 00 sac)
•^Frequency modulatk>n
inieruity
by MG/T. EXT (+5V)
•
Frequency
moduletior»
intensify
by EG1/EXT( + 5V)
5,
V,C-0.
mixer
•V.C^O
-1
level
•v.c,0.-2
level
6
Voltage coi^trolled
high
pass
filter
7. Voliage
controlled
low
pass liller
8,
Envelope
generator
1
9.
Envelope
generalor 2
10. Modulaiion
generalor
1
U
Manual
controller
12. P. Swilchand
volume
13.
Indicalor
•
Cutolf Ireqyency
(50H2-15.000HI)
*Peak(llel'^seirOSC)
•
Cuiod
frequency modulation
in-
tensity
by MG/T.EXT
(^5V
-
+ SV)
•Culofl
frequency modulaiion in-
tensity
by
EG2/EXT
(-SV +5V)
•Cutoff
frequency
(SOHi-
15.000HI)
•
Peak
(flat ^selfOSC)
•
Cutoff
frequency
modulation
in-
tensity
by
MG/ThEXT
(-5V- +5V)
•Cutoff
frequency
moduteiion
in-
tensify by EG2/EXT
C
-
5V
--
4
5V)
•Defay
time
fiOsec)
•Attack
lime
[10
sec)
•
Release time
(10
sec)
•
Hold
lime
[20
sec)
•Attack
lime
[10
sec)
•
Decay lime
(10
sec)
•
Sustain
level
[0
--5V)
•
Release time
(
1 0 sec)
•VVsva
form
(
iV
A
/I
.
in
-
ru
-
LTl)
•
Frequency
(
l :
l
1
:
80)
•
Control
wheel (center click)
(0.1Hz- 20Hj)
•
Momentary switch
•
Volume
•
LED
(KBD trigger, MG rale)
<
EXTERNAL SIGNAL PROCESSOR>
1. Conirol seclion
2. Input and output
3. Indicator (LEO)
•
Input
signal levet
(QdB
max.)
•
Low col
Irequancy
[50
-
2.500Hz)
•High cut
frequency
(100
-
5.000Hz)
•
CV adjust
•
Threshold level
•
Signal
In
(auto pad
system)
(1.0
-+
14.0V)
•Amplifier
Out
•Band pass filiered Out
•CV Out(F-V)
(0
-
+&.4V)
•£NVOut(0-
+5V)
•Trig Out
(+SV”Lgm})
•Peak
indicaiof
•Trigger
indicator
<
PATCH PANEL
>
1,
Keyboard
2. VCO
3. VCF
4. VCO +
VCF
5. VCA
6. EG
7.
MG
•
Keyboard caniroi
voltage
output
(exponeniial)
(Q-
+SV)
•Keyboard
nigger
output
(
+
5V
“toNo)
•
VCO-l
+ VCO-2
control
voUege
input [linear response)
(0-+8V)
•VCO-2
control
voflage
input
(iinear response)
(0
—
8V)
•VCO’1
+
VCO-2
external
frequerKy
control input
(OCT/V)(
+
SV -SV)
•External signal
input
(3Vp-pmax.)
•External
HP
liHer cutoff
frequency conirol
input
(20CT/V)(-SV-
+
5V)
•External LP filter
cutoff
frequency control
Input
(20CT/V)( -5V- + SV)
•
Total
external
modulation Input
(T.ext)(-6-+5V)
•
External initial gain
control Inpul
(0-+SVJ
•EG 1 envelope signal
normal
output
(
-
SV
—cr OV)
•EG 1 envelope
signal reverae
output
t
+
5Vz:i
—
r::::0V)
•EG 1 + EG 2
trigger
inpul
i
”^C3M3)
•
EG 1
trigger
input
[
“Lgmj
)
•
EG
2 envelope
signal reverse
output
(A^,^ f-OV)
•
Triangle
oulpul [fs.^ /\
^^)
(SVp-p-K-OV)
•
Rectangle
ouiput
(tn^
fU
^
LJI)
( in::^,)
8. Noise
generator
•
Pink noise ouiput (5Vp-p
±
20)
•
White noise
output
(SVp-p
±20)
9.
Sample and
hold
•
Clock trigger input
(
~Lqw)
•Sample signal input (5Vp-p
max.)
•
S/H output (5Vp-p max.)
10.
Modulation
VCA
•
Control
vpliago
input
(0-
+
5V)
•Signal
input
{
-
SV—
+SV)
•Signal
ouipui(
^-SV—
+
SV)
11^
Manual controller
Conirol wheel
ouiput
(-5V
^
OV- +5V)
•
Momentary
switch output
12. Signal out
13.
Headphones
•Signal outpul (2Vp-p output in-
pedance 3.5kn)
•Head
phones
output
((8P]
12dm wans
5.6)
14.
Power
consumption^ 10
watts
15. Dimensions
16.
Weight
17. Accessories
18. Options
•
SS9[WJ
X 309(D) X 249(H) mm
•7,7
kgs
•Patch
cord,
connection
cord
(35
cm
X
2.
3
m X
1
)
•Stand,
hard
case, fool
pedal
(MS01)
•Junclion box [MS
-02]

Korg MS-20 Specifications

General

Type	Analog Monophonic Synthesizer
Oscillators	2 VCOs
Year Released	1978
VCO 1	Sawtooth, Pulse
VCO 2	Sawtooth, Pulse
Filter	High-pass and Low-pass
LFO	Triangle
Keyboard	37 keys
Patch Panel	Yes
Connectivity	CV/Gate