Korg MS-10 Manuel utilisateur

MONOPHONIC SYNTHESIZER

SERVICE MANUALMS-10

CONTENTS

1SPECfFiCATIONS 2

2. STRUCTURAL DIAGRAM 3

3CIRCUIT DIAGRAM 4

A. PRIfsiTED CIRCUIT BOARD KLM-126B 5

6PARTS LIST (Mecf>anical parts not listed) 6

6BLOCK DIAGRAM 7

7. ADJUSTMENT PROCEDURE 8

KEIO ELECTRONIC LABORATORY CORPORATION

TOKVO/JAPAN

1, SPECIFICATIONS

1.KeyOoafO •F-^C 32 Keys/(2-2/3 oCBves)

2. Voltagdccntrolled •Scales 132', 16'. S'. 4M/

ceoilaior ^Soctaves (FM))

•Wave form (A/s. PW/PWM.

No4e]/(4 modes)

•PW adjitsi/PWM imensity

•Pitch (1 OCTAVE OR MOREl

•portarnento

•Frecuercy modulation intensity

oy MG

•Frequency modulation intensity

OyEG/eXT

3. Voltage controlled eCut'Ott frequency

low pass Filter •Peak Iflat —self OSC)

•Cut*oH frequency rncdulation

intensity by MG

•Oul^off frequency modulation

intensity by EG/EXT

4. Envelope generator* Hold time

•Attack time

•Decay time

•Sustain level

•Release time

5. Modufabon •Waveform r\-A-^in-nj*Lfl

generator CONTINUALLY

Frequency

6. Extcrnalinput •Signal level adjust

7Manual controller Control wheel CENTER CLICK

STOP

6- Power. SW A*Volume

volume

t. Keyboard

2. VCO

3. VCF

4- VCA

5EG

6. M3

•Keyboard control voltage output

(eirponentiai) 8V

•Keyboard trigger output/

•VCO control voltage Inpul

{linear reepor»se)/OV-- 48V

•External frequency corttrol

input (OCT/V)/ -3V- 43V

•External pulse width modulation

input/ -5V-^ 45V

•External signal input/3VPf max.

•External cut-otl frequency con-

trol hput (2CCT/V)/ -5V -45V

•Imtial gair> control In-

put/0V-45V

•External trigger Input/ “Loo

•Envelope signal reverse out-

put/ -5V-- 45V

•Triangle output (f\-A*AD/

5VPP

•Rectangle output (tn‘rU*Ln)

/0^+6V

7.Noise generaiot •Pin k noise outp ut/5V PP

•White r^oise ouipui/5VPP

8. Manual controller Cor>trol wheel output/

-5V'-0V'-*-5V

Signal out •Signal ouipui/2VPP max

(output impodance 3.5kQ)

to. Powerconsumpiion*5 Watts

•Dimension

•weight

•Acceesonee

•499(W) X 309(0) X249(H) mm

6.3 kgs

•Patch cord/36 cm x1

3. CIRCUIT DIAGRAM

IPPOM PO>(KEB SUP I

5. PARTS LIST

(Mechanical parrs not listed)

#CARBON RESISTORS •POLYPROPYLENE •ROTARYVARIABLE RESISTORS

noUistdd CAPACITORS EVH-SLA802B15 x3

200V-0,22^iF X1EVH.5LA802B14 x3

•METAL FILM RESISTORS 6VH.5LA802A16 x4

1/4W-100R X1•POLYSTYRENE CAPACITORS EVH-5LA802A16 x2

l/4W-4C3ii X16 50V-6200pF X1EVH.5LA802616 x 2

1/4W-4270 X16 EVH.5LA802A26 X 3

r/4W-2.94k« X1•POLYESTER CAPACITORS EVC-BQ5P18814 k1

1/4W-4.27Wi X1

1/4W-5.11W? X1

100V- 1*iF X 1 RJAP20614 K1

1/4W-619W X15 •TRANSISTORS •ROTARY SWITCH

l/4W-IOOkfJ X15 2SA-564A(S) x3SRM.103420P X 2

t/4W-nOkO X12$C-644(R) X1

2SC-946<L)K x1•KEY

•MYLAR CAPACITORS (special selected) F-E 32 key x1

SOVO.OOIkF X32SC 1583G X1

50V*0,0033*iF X22SC-168SS X7•CONNECTORS

50V-O.OI;<F X1<rj^ BE4P-SHF-1 X1

BE7P-SHF.1 X1

50V-0.0224<F X3•F£T

2SA-30A(0) *1Lb€9P-8HF.1 X1

•TANTALUM CAPACITORS 2SA-30A(RG) x2^BS3P-SHF-i X1

^BS4P-SHF.1 X1

I6V-6.8mF X1

ISV-IOmF X 1 •DIODES Female Connectors

IS- 1565 X24 3PMS-I002 X1

•CERAMIC CAPACITORS tS-l36S X44P MS-1003 X1

Z5V-0.VF X 1 4PUS-1004 X1

50V-22pF X1•LEO 7PMS-1005 X1

50\/*47pF X1GD-4-203RD x19P MS- 1006 X1

50V-100pF X3MLR-03TRC-1 x1

50V-5600F X1•1C

KORQ35 X»

MLR-03TRC«t50 x1

•ELECTROLYTIC CAPACITORS MC14007 K1•PHONE JACKS

16V-10«F X10 «PC4556 Xe2PSQ-7501 X11

16V*33mF X1»A7816 X12PSG-7615 X5

50V.1.0*iF X2CA3I40 X1

50V-470^iF X1TL08 1(071) X 2 •PC BOARD

«A791S X1KLM-130A X1

MC1406SB X1

•SEMI.FIXED RESISTORS

$Rl9DSlOMt X 2

8R19D8l00kil x 4

KLM.126& X1

6. BLOCK DIAGRAM

7. ADJUSTMENT PROCEDURE

7-1 Power supply checK

1Positive ripple.

Should be no more than 2mVp-p.

Set oscilloscope vertical gain at 10mV/cm and

check that power supply ripple is 2mV or less.

2. Negative rippie.

Same as positive, should be no more than

2mVp*p.

7*2 Pitch adjustment

1. VCO-1.

Perlorm adjustment with synthesizer controls at

"normal setting" {Scale =0, Waveiorm^ ru ,

Master Tune. Pitch, arid all other knobs at "0").

See figure 1

a. Play C-3 (high C) on the keyboard and ad-

just the high 0semi-fixed screw uniM you obtain

the correct tuning as indicated by WT-10A

(connected to tne SiG OUT jack).

b. Play key C<1 and adjust the tow 0semi,

fixed screw.

c. Repeat steps aand bas many times as

necessary until both are tuned to the correct

pitch.

d. Check the tuning of C*1. C-2. and C-3 on

the WT-lOA meter io make sure pitch deviation

iswilh t2 cents for each.

e. Change the scale to 32', 1S’, $\ and 4' and

check the tuning of all four Ckeys to make sure

that the pitch oeviatlon of each Is within tio cents.

7-3 KBD CV adjustment

Use a4-1/2 digital voltmeter to measure the KBD

CV OUT signal.

a. Measure output voltage first when you play

key C-3, then when you play key C-2. The output

voltage icr c-3 should be exactly half that for

C-3. Adjust the KBD CV high 0semi-fixed

screw as necessary so that C-2 produces half

the voltage of C-3.

b. Measure C-2 and then C- 11n the same way.

Adjust the KBD CV low Oeemi-fixed screw as

necessary so that C-2 produces exactly half the

voltage of C-3

c. Repeat steps a arxf bas many times as

necessary until ouiput vdtage of each of

C- 1,C-2. and C-3 is exactly half ft^al of the next.

©'©

pH*

•oU

mrn

ATUC«

WT-10A

Digital voltage

meter

C-1 C-2 C-3

Ftg. I

7-4 VCF Fc adjustment

Connect afrequency counter to the SiQ oul jack.

1. VCLPF

Refer to the settings shown in figure 2. Set the Fc

knob at "5'\ and the LPF PEAK knob a1 “10”.

Then adjust the Osemi-fi)(ed screw as neces*

sary $0 that the LPF oscillation frequertcy is

500Hz.

o 0 ©

nr«h oo0

AOAS

Lgw* o(cU

>©

MAO

AttACK

OiCAt

SUSTAIN

FREQUENCY

COUNTER

cHIEIho o-^

Fig-

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