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MONOPHONIC

SYNTHESIZER

SERVICE

MANUAL

MS-20

.

SPECIFICATIONS

...ccsesetereeeereieeecacine

2

2.

STRUCTURAL

DIAGRAM...

eee

4

5

_

3.

CIRCUIT

DIAGRAM

(1)...

een

reerernneerces

CIRCUIT

DIAGRAM

(2)...

ccc

eeeeerteeereees

4.

FRONT

VIEW

OF

PRINTED

CIRCUIT

BOARD

MMe

Fe

Poo

ianccceisescpeceadenctceastivicsaastonseacsdenedepasdies

7

5.

PARTS

LIST

(Mechanical

parts

notlisted)...........

&

6.

BLOCK

DIAGRAM

wee

@

7.

ADJUSTMENT

PROCEDURE

........

ccc

10

KEIO

ELECTRONIC

LABORATORY

CORPORATION

TAaxYO/

JAPAN

1.

SPECIFICATIONS

<

CONTROL

SECTION

>

1.

é.

Keyboard

Voltage

controtled

oscillator

t

VC.0.2

V.C.0.

master

control

.

V.C.0.

mixer

,

Voltage

controlled

high

pass

filter

.

Voltage

controlled

low

pass

filter

.

Envelope

generator

1

.

Envelope

generator

2

.

Modulation

generator

.

Manual

controller

.

P.

Switch

and

volume

.

Indicator

"C~C

37

keys

(3

octaves)

*Scale

(32',

16°,

8

43

(6

octaves,

+

cent,

—

cent)

*Wave

form

(A,

&,

PW

(TU

~

ILJ),

white

noise)

(4

modes)

*Pulse

width

adjust

1:1

~

1:

*

Scale

(16',

8",

4’,

2°}

(6

octaves,

+

cent,

-

cent)

*Wave

form

(M,C,

fl,

ring

modulator)

(4

mcdes}

*Pitch

(+1

OCTAVES)

*

Master

tune

(+100

cent}

*Portamento

(max.

00

sec)

*Frequency

modulation

intensity

by

MG/T.

EXT

(+5V)

*Frequency

modulation

intensity

by

EG1/EXT

(+54)

*V.C.0.-1

level

*V.C.0.-2

level

*

Cutoff

frequency

(50Hz

~

+5,000Hz)

*

Peak

(flat~self

OSC)

*

Cutotf

frequency

modulation

in-

tensity

by

MG/T.EXT

(-5¥

~

+5V}

*

Cutoff

frequency

modulation

in-

tensity

by

EG2/EXT

(-5V

~

+5V}

*

Cutoff

frequency

(50Hz~

15,000Hz)

*Peak

(flat~seif

OSC)

*

Cutoff

frequency

modulation

in-

tensity

by

MG/T.EXT

(-5V

~

+5V}

*Cutotf

frequency

modulation

in-

tensity

by

EG2/EXT

(+5V~

+5V)

*

Delay

time

(10

sec)

*

Attack

time

(10

sec}

*

Release

time

(10

sec)

*

Hold

time

(20

sec)

*

Attack

time

(10

sac)

*

Decay

time

(10

sec)

"Sustain

level

(Q~5¥}

"

Release

time

(10

sec)

*Wave

form(

K~

A

~

71,

m~

fh

~

ul)

*

Frequency

(1:

1

~

1:80)

*Control

wheet

(center

(O.tH2

~

20Hz}

*Momentary

switch

“tenn

*Volume

cli¢k}

*LED

(KBD

trigger,

MG

rate}

<

EXTERNAL

SIGNAL

PROCESSOR

>

1.

Control

section

2.

Input

and

output

3.

Indicator

{LED}

<

PATCH

PANEL

>

Ly

Keyboard

VCF

.

VCO

+

VCF

VCA

EG

*|Input

signal

levei

(dB

max.)

*Low

cut

frequency

(50

~

2,500Hz)

*High

cut

frequency

(100

~

5,000HZz}

*CV

adjust

*

Threshold

ievel

*

Signal

In

(auto

pad

system)

(3.0

~+14.0V)

*

Amplifier

Out

“Band

pass

filtered

Out

*CV

Out

(Fo

¥)

(0

~

+8.4¥)

*ENV

Out

(0

~

+5¥V}

*Trig

Out

(+5V

“tonp}

*Peak

indicator

*

Trigger

indicator

*

Keyboard

control

voltage

output

(exponential)

(Q~

+8V)

*Keyboard

trigger

output

{+5

~tenp)

*V¥CO-1

+

VCO-2

control

voltage

input

(linear

response)

(O~

+

8V)

®VCO-2

control

voltage

(linear

response}

(0

~

BV)

*V¥CO-1

+

VCOQO-2

external

frequency

control

input

(OCT)

(4

5V

—5V}

“External

signal

input

(3Vp-p

max.)

*External

HP

filter

frequency

control

input

(2O0CT/V)

(-5V

~

+5V)

*External

LP

fitter

cutoff

frequency

control

input

{2OCT/V)

(—-5SV~

+

5V)

*Total

externa!

modulation

input

(T.

ext)

(-5~

+64)

*

External

initial

gain

control

input

(O~

+

5¥)

"EG

1

envelope

signal

normai

output

(

-5V

=7—7=0V)

*EG

1

envelope

signal

reverse

output

(+

SVL.

OV)

"EG

7

+

EG

2

trigger

input

(“tGno}

*EG

1

trigger

input

(“Leno

}

*EG

2

envelope

signal

reverse

output

(4,-7.0)

*

Triangié

output

(Mi~

A

~

1)

(SVp-p-Px-

OV)

*Rectangle

output

(I~

Tu

~

ingut

cutott

(UT

8.

Noise

generator

=

*

Pink

noise

output

(5Vp-p

+20)

12.

Signal

out

*Signal

output

(2Vp-p

output

in-

*

While

noise

output

(SVp-p

+20)

pedance

3.5kn}

9.

Sample

and

hold

=

*

Clock

trigger

input

(“+

gnp}

13.

Head

phones

*Head

phones

output

((i)

*Sample

signat

input

(5Vp-p

120m

watts

§.6)

max.)

14,

Power

consumption

10

watts

*S/H

output

(5Vp-p

max.)

15.

Dimensions

*569(W)

x

308{D)

x

249(H}

mm

10.

Modulation

VCA

=

*

Control

voltage

input

(0~

+

5V)

16.

Weight

"7.7

kgs

*

Signal

input

(-5V~

+5V)

17.

Accessories

*Patch

cord,

connection

cord

*

Signal

output

(-—5V~

+5V)

(35

emx2,3mx

1)

11.

Manual

controller

*Control

wheel

output

18,

Options

*Stand,

nard

case,

foot

pedal

{-5V

+

OV—

+5V)

(MS-01)

"Momentary

switch

output

*

Junction

box

(MS-02)

(tno)

C

2.

STRUCTURAL

DIAGRAM

Side

panel

(ret)

a

Rotary

knob

{iarge)

ay

Rotary

knoo

(amait)

From

panet

Power

supply

“!

“FI

fe

+

_Vaaslormer

i

c

C.onrol

whee:

Main

chassis

Aubber

tee

#5

PE

eae

Ou

3.

CIRCUIT

DIAGRAM

(1)

15

-180506

(SM

~1-02)

&

raeol

rte

Ras

R30

vRIO

925

B80L

2uA

K3CAIGAD

5,

3140

100K18

101%

SELecter

!

)

Le

{FROM

EG-2]

|

.

Dearere

tees,

Ya20

OOK

‘e

C)

fF

ROM

TEXT,

(i)

6945

SELECTED

*F

covcce

OPER

TLoez

(REVERSE

OUT|

+8¥

"NSS

veasse

Rez

am

CIRCUIT

DIAGRAM

(2)

KLM-128

A

ea

az

KLM-129

[516

LEVEL

J

+18

-198v

4.

FRONT

VIEW

OF

PRINTED

CIRCUIT

BOARD

KLM-127

POWER

SUPPLY

EG

2

MIXER

HP-FILTER

LP-FILTER

|

VCA

Ras

OMe?

(/FRE@

MOD

EGI/

ExT

KBD

FOLLOWER

FREQ

TRIG

DETECTOR

‘>

|

“~

KLM-128C

Woiyyanz)

asion

PARTS

LIST

(Mechanical

parts

not

listed)

@

CARBON

RESISTORS

not

listed

@METAL

FILM

RESISTORS

1/4Wi%

1000

x

2

1/4W

1%

4039

18

1/4W

1%

4279

22

1/4W

1%

1kQ

1/4W

1%

2kQ

1

/4W

1%

2.94k0

1/4W

1%

4.27k9

1/4W

1%

10ka

1/4W

1%

T5ka

T/4aW

1%

20k2

1/4W

1%

61.9k2

1/4W

1%

100ka

1/4W

1%

1102

1/4W

1%

5.11kQ

x

x

x

MK KM uM WK

MK

RK KH

KK

@SOLIO

AESISTOAS

1/4W10%

10M

x

7

@

MYLAR

CAPACITORS

not

listed

@STYAOL

CAPACITORS

50V-12000pF

x 1

@

CERAMIC

CAPACITORS

5OV-56pF

x

1

50V-22pF

x

1

50V-100pF

x

5

50V-220pF

x

2

S0V-47pF

x

1

25V-100000pF

x

2

@

TANTALUM

CAPACITORS

16V-3.3uF

x

1

16V-6.8nF

x

2

@

ELECTROLYTIC

CAPACITORS

16V-10uF

x

42

16V-39uF

x

2

16V-100uF

x

4

SOV-ipF

ox)

6

25V-470~F

x

1

25¥-10000uF

x

1

16V-220uF

x

1

@POLYSTYRENE

CAPACITORS

50V-3000pF

x

+t

50V-6200pF

x

1

@POLYPROPPYLENE

CAPACITORS

200V-0.22uF

x

7

@TRANSISTORS

2SA-564(S)

x

4

28C-945(L)K

x

1

(special

selected}

28C-1688G

x

2

285C-1685SS

x

13

2SC-644R

x

1

2SK-30(0)

x

4

2SK-30(GR)

x

4

@DIODES

18-1555

x

33

@.éED

GD4-203RD

x

4

@PHOTOCOUPLER

HTV-P873-G35-201B

x

1

@Ic

wPC-4558C

x

#17

O81

x

5

TL-(97

1)

{3140)

O82

x

1

TL-(O072)

(3140)

MC-14007

x

2

MC-14069B

x

2

wPO4011C

x

1

uPC339C

x

1

#PCi4915

=

x

1

wATIM15

x

1

KORG35

x

2

@SEMI-FIXED

RESISTORS

SRISR(10kKB)

x

6

SRISR(IGOkKB)

x

7

@ROTARY

VARIABLE

RESISTORS

JOKB

x

4

100KA

100KA

IMB

2MA

1MA

Printed

10KA

Printed

10KB

Printed

1MB

Printed

4-ganged

100KC

249

10KB

Center

click-stop

10KB

aan

nen

aun

hry

bo

x

xX

KX

KM MH

KH

KM

MM

KR

OM

@ROTARY

SWITCH

SRM-1034

1-15mm

x

4

@KEYBOARD

ESK-431

37

key

@TERMINAL

LUG

BOARD

2L4P

x

1

@PUSH

SWITCH

MS-102

x

1

@CONNECTORS

TW3P

x

6

4P

x

2

SP

x

2

7P

x

1

BP

x

2

SP

x

3

SP

x

1

Femaie

Connectors

3P

x

10

4P

x

2

SP

x

3

7P

x

2

BP

x

2

7.

ADJUSTMENT

PROCEDURE

7-1

Power

supply

check

1.

Positive

rippie,

Should

be

no

more

than

2mVp-p.

Set

oscilloscope

vertical

gain

at

10mV/em

and

check

that

power

supply

ripple

is

2m

or

jess.

Negative

ripple.

Same

as

positive,

should

be

na

more

than

2mVp-p.

7-2.

Pitch

adjustment

1.

¥CO-1.

Perform

adjustment

with

synthesizer

controls

at

“normal

setting’

(Scale=8,

Waveform=

Tu

,

Master

Tune,

Pitch,

and

ail

cther

knobs

at

“0").

See

figure

1.

a.

Play

C-4

(high

C)

on

the

keyboard

and

ad-

just

the

high

@

semi-fixed

screw

until

you

obtain

the

correct

tuning

as

indicated

by

WT-10A

{connected

to

the

SIG

OUT

jack).

b.

Play

key

C-1

and

adjust

the

low

@

semi-

fixed

screw.

c.

Repeat

steps

a

and

b

as

many

times

as

necessary

until

both

are

tuned

to

the

correct

pitch.

d.

Check

the

tuning

of

C-1,

C-2,

C-3,

and

C-4

on

the

WT-10A

meter

to

make

sure

pitch

devia-

tion

is

within

+2

cents

for

each.

10

e.

Change

the

scale

to

32’,

16',

8’,

and

4'

and

check

the

tuning

of

all

four

¢

keys

to

make

sure

that

the

pitch

deviation

of

each

is

within

+10

cents.

2.

¥VCOQ-2.

Set

the

VCO-1

level

at

“O"

and

the

VCO-2

level

at

"10".

Then

follow

the

same

procedure

as

for

VCOQ-1,

by

adjusting

the

hign

@

and

low

@

semi-fixed

screws.

7-3.

KBD

CV

adjustment

Use

a

4-1/2

digital

voltmeter

to

measure

the

KBD

CV

OUT

signal.

a.

Measure

output

voliage

first

when

you

play

key

C-4,

then

when

you

play

key

C-3.

The

output

voltage

for

C-3

shoud

be

exactly

half

that

for

C-4.

Adjust

the

KBD

CV

high

@

semi-fixed

screw

as

necessary

so

that

C-3

produces

half

the

voltage

of

C-4.

ob.

Measure

C-2 and

then

C-1

in

the

same

way.

Adjust

the

KBD

CV

low

@

semi-tixed

screw

as

necessary

so

that

C-2

produces

exactly

half

the

voltage

of

C-4.

c.

Repeat

steps

a

and

b

as

many

times

as

necessary

until

the

output

voltage

of

each

of

C-1,

G-2,

C-3,

and

C-4

is

exactly

half

that

of

the

next.

DIGITAL

VOLTMETER

7-4.

VCF

Fe

adjustment

Connect

a

frequency

counter

to

the

PHONES

jack

(since

a

high

output

level

is

needed

for

measure-

ment).

Set

VCO-1

and

¥VCO-2

level

at"0”.

1.

VC

HPF

Refer

to

the

settings

shown

in

figure

2.

Set

the

LPF

PEAK

knob

at

“0”,

and

the

HPF

PEAK

knob

OOOO

SIG

LEVER

Loweu)

mp

cut

Ce

Ds

TWRER

LEVEL

Fig.

2

1

at

"10".

Then

adjust

the

@

semi-fixed

screw

as

necessary

so

that

the

HPF

oscillation

frequency

is

500Hz.

.

VOLPF

Set

HPF

PEAK

at

“0”,

and

LPF

PEAK

at

“10”.

Then

adjust

the

@

semi-fixed

screw

in

the

same

way

as

you

did

for

the

HPF.

FREQUENCY

COUNTER

£5)

Sf

PAOCESSDA

:

Oe

POLE

}O

pi

0-0