Korg MS-10 User manual

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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
<CONTROL SECTION >
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
<PATCH PANEL SECTION >
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
9.
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
2

3. CIRCUIT DIAGRAM
IPPOM PO>(KEB SUP I
4

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
1
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

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.
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Digital voltage
meter
C-1 C-2 C-3
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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.
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FREQUENCY
COUNTER
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Fig-
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