Korg MONOPOLY POLYSIX MS-20 Manuel utilisateur

MONOPHONIC

SYNTHESIZER

SERVICE

MANUAL

MS-20

SPECIFICATIONS

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STRUCTURAL

DIAGRAM...

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CIRCUIT

DIAGRAM

(1)...

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CIRCUIT

DIAGRAM

(2)...

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FRONT

VIEW

PRINTED

CIRCUIT

BOARD

MMe

Poo

ianccceisescpeceadenctceastivicsaastonseacsdenedepasdies

PARTS

LIST

(Mechanical

parts

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

BLOCK

DIAGRAM

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ADJUSTMENT

PROCEDURE

........

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KEIO

ELECTRONIC

LABORATORY

CORPORATION

TAaxYO/

JAPAN

SPECIFICATIONS

CONTROL

SECTION

é.

Keyboard

Voltage

controtled

oscillator

VC.0.2

V.C.0.

master

control

V.C.0.

mixer

Voltage

controlled

high

pass

filter

Voltage

controlled

low

pass

filter

Envelope

generator

Envelope

generator

Modulation

generator

Manual

controller

Switch

and

volume

Indicator

"C~C

keys

octaves)

*Scale

(32',

16°,

octaves,

cent,

—

cent)

*Wave

form

(A,

(TU

ILJ),

white

noise)

modes)

*Pulse

width

adjust

1:1

Scale

(16',

8",

4’,

2°}

octaves,

cent,

cent)

*Wave

form

(M,C,

fl,

ring

modulator)

mcdes}

*Pitch

(+1

OCTAVES)

Master

tune

(+100

cent}

*Portamento

(max.

sec)

*Frequency

modulation

intensity

MG/T.

EXT

(+5V)

*Frequency

modulation

intensity

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

MG/T.EXT

(-5¥

+5V}

Cutoff

frequency

modulation

in-

tensity

EG2/EXT

(-5V

+5V}

Cutoff

frequency

(50Hz~

15,000Hz)

*Peak

(flat~seif

OSC)

Cutoff

frequency

modulation

in-

tensity

MG/T.EXT

(-5V

+5V}

*Cutotf

frequency

modulation

in-

tensity

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(

71,

ul)

Frequency

(1:

1:80)

*Control

wheet

(center

(O.tH2

20Hz}

*Momentary

switch

“tenn

*Volume

cli¢k}

*LED

(KBD

trigger,

rate}

EXTERNAL

SIGNAL

PROCESSOR

Control

section

Input

and

output

Indicator

{LED}

PATCH

PANEL

Keyboard

VCF

VCO

VCF

VCA

*|Input

signal

levei

(dB

max.)

*Low

cut

frequency

(50

2,500Hz)

*High

cut

frequency

(100

5,000HZz}

*CV

adjust

Threshold

ievel

Signal

(auto

pad

system)

(3.0

~+14.0V)

Amplifier

Out

“Band

pass

filtered

Out

*CV

Out

(Fo

¥)

+8.4¥)

*ENV

Out

+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}

BV)

*V¥CO-1

VCOQO-2

external

frequency

control

input

(OCT)

—5V}

“External

signal

input

(3Vp-p

max.)

*External

filter

frequency

control

input

(2O0CT/V)

(-5V

+5V)

*External

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

envelope

signal

normai

output

(

-5V

=7—7=0V)

*EG

envelope

signal

reverse

output

SVL.

OV)

"EG

trigger

input

(“tGno}

*EG

trigger

input

(“Leno

}

*EG

envelope

signal

reverse

output

(4,-7.0)

Triangié

output

(Mi~

(SVp-p-Px-

OV)

*Rectangle

output

(I~

ingut

cutott

(UT

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}

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

watts

*S/H

output

(5Vp-p

max.)

15.

Dimensions

*569(W)

308{D)

249(H}

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

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)

STRUCTURAL

DIAGRAM

Side

panel

(ret)

Rotary

knob

{iarge)

Rotary

knoo

(amait)

From

panet

Power

supply

“!

“FI

_Vaaslormer

C.onrol

whee:

Main

chassis

Aubber

tee

eae

CIRCUIT

DIAGRAM

(1)

-180506

(SM

~1-02)

raeol

rte

Ras

R30

vRIO

925

B80L

2uA

K3CAIGAD

3140

100K18

101%

SELecter

)

{FROM

EG-2]

Dearere

tees,

Ya20

OOK

‘e

ROM

TEXT,

(i)

6945

SELECTED

covcce

OPER

TLoez

(REVERSE

OUT|

+8¥

"NSS

veasse

Rez

CIRCUIT

DIAGRAM

(2)

KLM-128

KLM-129

[516

LEVEL

+18

-198v

FRONT

VIEW

PRINTED

CIRCUIT

BOARD

KLM-127

POWER

SUPPLY

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

1/4W

4039

1/4W

4279

1/4W

1kQ

1/4W

2kQ

/4W

2.94k0

1/4W

4.27k9

1/4W

10ka

1/4W

T5ka

T/4aW

20k2

1/4W

61.9k2

1/4W

100ka

1/4W

1102

1/4W

5.11kQ

MK KM uM WK

RK KH

@SOLIO

AESISTOAS

1/4W10%

10M

MYLAR

CAPACITORS

not

listed

@STYAOL

CAPACITORS

50V-12000pF

x 1

CERAMIC

CAPACITORS

5OV-56pF

50V-22pF

50V-100pF

50V-220pF

S0V-47pF

25V-100000pF

TANTALUM

CAPACITORS

16V-3.3uF

16V-6.8nF

ELECTROLYTIC

CAPACITORS

16V-10uF

16V-39uF

16V-100uF

SOV-ipF

ox)

25V-470~F

25¥-10000uF

16V-220uF

@POLYSTYRENE

CAPACITORS

50V-3000pF

50V-6200pF

@POLYPROPPYLENE

CAPACITORS

200V-0.22uF

@TRANSISTORS

2SA-564(S)

28C-945(L)K

(special

selected}

28C-1688G

285C-1685SS

2SC-644R

2SK-30(0)

2SK-30(GR)

@DIODES

18-1555

@.éED

GD4-203RD

@PHOTOCOUPLER

HTV-P873-G35-201B

@Ic

wPC-4558C

#17

O81

TL-(97

{3140)

O82

TL-(O072)

(3140)

MC-14007

MC-14069B

wPO4011C

uPC339C

#PCi4915

wATIM15

KORG35

@SEMI-FIXED

RESISTORS

SRISR(10kKB)

SRISR(IGOkKB)

@ROTARY

VARIABLE

RESISTORS

JOKB

100KA

IMB

2MA

1MA

Printed

10KA

Printed

10KB

Printed

1MB

Printed

4-ganged

100KC

249

10KB

Center

click-stop

10KB

aan

nen

aun

hry

KM MH

@ROTARY

SWITCH

SRM-1034

1-15mm

@KEYBOARD

ESK-431

key

@TERMINAL

LUG

BOARD

2L4P

@PUSH

SWITCH

MS-102

@CONNECTORS

TW3P

Femaie

Connectors

ADJUSTMENT

PROCEDURE

7-1

Power

supply

check

Positive

rippie,

Should

than

2mVp-p.

Set

oscilloscope

vertical

gain

10mV/em

and

check

that

power

supply

ripple

jess.

Negative

ripple.

Same

positive,

should

than

2mVp-p.

7-2.

Pitch

adjustment

¥CO-1.

Perform

adjustment

with

synthesizer

controls

“normal

setting’

(Scale=8,

Waveform=

Master

Tune,

Pitch,

and

ail

cther

knobs

“0").

See

figure

Play

C-4

(high

the

keyboard

and

ad-

just

the

high

semi-fixed

screw

until

you

obtain

the

correct

tuning

indicated

WT-10A

{connected

the

SIG

OUT

jack).

Play

key

C-1

and

adjust

the

low

semi-

fixed

screw.

Repeat

steps

and

many

times

necessary

until

both

are

tuned

the

correct

pitch.

Check

the

tuning

C-1,

C-2,

C-3,

and

C-4

the

WT-10A

meter

make

sure

pitch

devia-

tion

within

cents

for

each.

Change

the

scale

32’,

16',

8’,

and

check

the

tuning

all

four

keys

make

sure

that

the

pitch

deviation

each

within

+10

cents.

¥VCOQ-2.

Set

the

VCO-1

level

“O"

and

the

VCO-2

level

"10".

Then

the

same

procedure

for

VCOQ-1,

adjusting

the

hign

and

low

semi-fixed

screws.

7-3.

KBD

adjustment

Use

4-1/2

digital

voltmeter

measure

the

KBD

OUT

signal.

Measure

output

voliage

first

when

you

play

key

C-4,

then

when

you

play

key

C-3.

The

output

voltage

for

C-3

shoud

exactly

half

that

for

C-4.

Adjust

the

KBD

high

semi-fixed

screw

necessary

that

C-3

produces

half

the

voltage

C-4.

ob.

Measure

C-2 and

then

C-1

the

same

way.

Adjust

the

KBD

low

semi-tixed

screw

necessary

that

C-2

produces

exactly

half

the

voltage

C-4.

Repeat

steps

and

many

times

necessary

until

the

output

voltage

each

C-1,

G-2,

C-3,

and

C-4

exactly

half

that

the

next.

DIGITAL

VOLTMETER

7-4.

VCF

adjustment

Connect

frequency

counter

the

PHONES

jack

(since

high

output

level

needed

for

measure-

ment).

Set

VCO-1

and

¥VCO-2

level

at"0”.

HPF

Refer

the

settings

shown

figure

Set

the

LPF

PEAK

knob

“0”,

and

the

HPF

PEAK

knob

OOOO

SIG

LEVER

Loweu)

cut

TWRER

LEVEL

Fig.

"10".

Then

adjust

the

semi-fixed

screw

necessary

that

the

HPF

oscillation

frequency

500Hz.

VOLPF

Set

HPF

PEAK

“0”,

and

LPF

PEAK

“10”.

Then

adjust

the

semi-fixed

screw

the

same

way

you

did

for

the

HPF.

FREQUENCY

COUNTER

£5)

PAOCESSDA

POLE

0-0

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