Korg Mono/Poly User manual

4VCO SYNTHESIZER
MANUAL
CONTENTS
1. SPECIFICATIONS 1
2. STRUCTURAL DIAGRAM 2
3. BLOCK DIAGRAM 3
4. CIRCUIT DIAGRAM. 5
5. PC BOARD 13
6. INTERCHANGE LIST OF CONNECTOR
TERMINAL NUMBER 18
7. SEMI-FIXED RESISTORS DIAGRAM ... 19
8. ADJUSTMENT PROCEDURE 20
9. PARTS LIST 23
KEIO ELECTRONIC LABORATORY CORPORATION
TOKYO/JAPAN

1. SPECIFICATIONS
KEYBOARD
VCO (x4) ...
VCF
VCF EG
VCA EG
NOISE (White Noise)
TRIGGER MODE ..
AUTO DAMP
MG-1
MG-2
PWM
PW
PORTAMENTO
DETUNE
TRANSPOSE
EFFECT
KEY ASSIGN MODE
ARPEGGIATOR
WHEEL (x2)
OUTPUTS
INPUT JACKS
OUTPUT JACKS
TRIGGER POLARITY SWITCH
DIMENSIONS
WEIGHT
ACCESSORIES
POWER CONSUMPTION
44 Keys (F -C)
Waveform (A,N, PWM, PW)
Octave Selector (16', 8', 4', 2'0)
Level
Tuning (Master Tune x1, ±50 Cents or More,
Tune x3, ±50 Cents or More)
Cutoff Frequency Adjustment
Resonance Adjustment
Envelope Generator
Modulation Sensitivity Adjustment
Keyboard Tracking (0~ 150%)
Attack Time
Decay Time
Sustain Level
Release Time
Attack Time
Decay Time
Sustain Level
Release Time
Level
Single/Multiple
ON/Off
Waveform (A,N,/I,n)
Frequency (Below 0.1 Hz to above 20Hz)
Waveform (A)
Frequency (Below 0.1 Hz to above 30Hz)
Sensitivity Adjustment
Mode (VCF EG, MG-1, MG-2)
Pulse Width Adjustment
Time Adjustment
VC04 (-35 <+ +35) when VC02 is (+35 *-35)
Up/Normal/Down
On/Off
Mode (Synchro, Cross-Modulation,
Synchro +Cross-Modulation)
Connection (Single, Double)
Frequency Modulation Sensitivity Adjustment
Cross-Modulation Sensitivity Adjustment
Poly
Unison/Share
Unison
Chord Memory
Hold
Range (Full, 2oct, 1oct)
Mode (Up, Down, Up/Down)
Arpeggio (Off, On, Latch)
Bend (Sensitivity Adjustment, VCO 1/Slave
BCO, Pitch, VCF)
MG-1 (Sensitivity Adjustment, VC01/ Slave
VCO, Pitch, VCF)
Level Selector (Off, Low, High)
Volume
Arpeggio Trigger In (GND)
Portamento (GND)
VCFfcM In (-5V-+5V)
VCO FM In (-5V -+5V)
Trigger In
CV In (DctAO
Trigger Out
CV Out (Oct/V)
Headphone
Output
H_gnd. ZJT q^o
744(W) x450(D) x144(H) mm
12kg
Connection Cord
Sound Sample Tape
Voltage (Local Voltage 50/60Hz/Wattage 28W)
1

2. STRUCTURAL DIAGRAM
PART
NO. PART NAME REMARKS
1Wooden case KOC-D1004
2Front panel KOC-C20112
3Phone jack plate KOC-C30177
4Metal fitting of tact board KOC-C40395
No.1 (U)
5Metal fitting of tact board KOC-C40395
No.2 (L)
6Metal fitting of MG C. BKOC-C40396
7Power plate KOC-C40397
8Metal fitting of KLM-376 KOC-C40405
9Radiation board KOC-C40406
10 Metal fitting of slide sw KOC-C40266
11 Control panel KOC-E20028
12 Control wheel KOC-E40091
13 Key board ESK-721 (E-C)
14 Model number plate KOC-C40144
15 Small radiation board KOC-C40416

3.BL0CK DIAGRAM (1)
NOISE
44 KEYS
PHONE
AMP PHONE
OUT
CONTROL LINE
>SIGNAL LINE

4. CIRCUIT DIAGRAM
KLM-353
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ira
BEND WHEEL
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16-2 VCF(MGI)
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02 l^P"23
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KLM-327 (OLD PRODUCTION)
KLM-327 has been replaced by KLM-355 (New production)
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*T 'R52
R52I
Q40
iClt C*
J2fl4«<47
SWl SWl
«AV
0403
RV)li VR403 J16$
-AW
R96
ROi Wsaw
,—304
0305
l0405Rt4
R531
VRI4
C309
R5.9 nj25 J20L^24 LB4Q4
VR404
O, J210
VR401
C310
L.IVH3
16

KLM-376-MP
**-
Q2
B
J3 J2" R2 *^d**Aaa**»
-vw VR3
(+15)
8
BQ4(+J5
RI5
.; >
*4f
•t
.,
-VvV.
;
Is '-£
ICI
fS Q8
RI4 Vl/ Rie +
-> »'*%
i_
-> -
02 03 D4 05
•t ** t**«^**^ n
CI3
v
.-._- -v «-
VR2(+5) i
41
**» ^
****
-3**
"i. *«--*,*.• 1**
+iT
rr
J6
..•"-
R9RI0 '"*-'
Vft ** "»Iv
lTl l rf A. ^
t* CI4 ^*r
i•*.«»
KLM-376A-MP
KLM-357 rQl Q2 tut Q3
.:-.' -1
ICI
RIO
IC2 C8
RI3 RI4
+< R5
CIO +
o-
J2
Of "8 :iH
R3 R4
'j
*
*
-.
CN29
17

6. INTER CHANGE LIST OF CONNECTOR TERMINAL NUMBER
This list was made with the change of the connector. Please compare new number with old one reffering to the list.
RCCCPTACLC
OLO RECEPTACLE NEW :onnecJ
TOR
N*. ;OLOrt P.C.B. FUNCTION RECEPTACLE RECEPTACLE C°?oiC'QLOII
OLO J
NEW ™R-°LOfl P.C8. FUNCTION 1RECENTAClC
OLO RECENTACLJlCONNHC-L_, _J
tor COLOR
NO P.C.B. FUNCTION •ECIPTACIE
OLO RECETACLI
NEW CONNEcJ ^, J
tor COLOF
No. P.C.B. FUNCTION
1-1 1-6 58N KLM-353 ARPEGGIO TRIG 15-1 15-5 11 GR KLM-3S5 AUTO DAMP COM 126* 26-2 00 BU 90 -15 PI PI 5BU JACK OUTPUT
1
1-2
1-3
1-4
1-5
1-6
1-5 00 RD 90 PHONE GNO 15-2 154 99 tf 00 NOISE 26* 26-1 00 00 00 15 P2 P2 00 GR t« •• GNO
1-4 00 OR tf PHONE OUT-2 15-3 15-3 00 •9 00 FMEG 27-1 27-4 16 PU KLM-356 CV4 P3 P3 tt YE ft PHONE 1
1-3 99 YE 09 PHONE OUT-1 15-4 15-2 00 00 00 PWM EG |27-2 27-3 09 90 00 CV3 P4 P4 ft OR ft 2
1-2 00 GR 00 OUT GNO 155 15-1 00 99 00 VCO OUT I27-3 27-2 90 09 00 CV2 P5 P5 90 RD *t GND
1-1 ft BU 90 SIGNAL OUT O274 27-1 00 tf 00 CV1 P6 P6 18 GR JACK CVOUT
^S9 161 164 3RD 355 VCA OUT GND [P7 P7 ft PU tf •• IN
2*1 2-4 3RO 353 VCAOUTGND 16-2 16 300 00 00 VCA OUT 28-1 28-7 18 BN 356 TRIG IN JACK-P14 P8 P8 If BU ft »IN
2-2 2-3 Mm M VGA OUT 16-3 16-2 09 ft 40 VCF MG1 28-2 28* ff RD ft TRIG IN JACK-P13 P9 P9 ft YE 00 «GNO
2-3 2-2 ff *MVCF(MGl) 16-4 16-1 *# 90 ••VCF 8END 128-3 28-5 ff OR fARPTRIGIN-P22 P10 P10 12 OR SW TRIG OUT
2-4 2-1 t# •• •# VCF (BEND) 28-4 28-4 90 YE ft CV IN GND-P9 Pll P11 tf YE ff TRIG OUT
&^^ *17-1 17-5 13 BL 355 GND 128-5 28-3 00 GR ft CV OUT-P6 P12 P12 ft PU JACK TRIG IN
3-1
3-2
3-3
3-4
3-4 48L 353 GNO 17-2 174 Pi 09 99 90 \l 28* 28-2 ff BU 94 CVIN(SW)-P8 P13 P13 18 RO MTRIG IN {SW)
3-3 ## 00 ft GNO 17-3 17-3 00 OR 00 5128-7 28-1 ffPU 09 CV IN-P7 P14 P14 f# BN 90 00 00 {99 )
3-2 wBU 00 -15V17-4 17-2 00 BU 90 -* 1P15 P15 12 GR SW PORSW
3-1 t» RO 00 15V 175 17-1 00 RO 09 15 29-1 29-10 21 4_ 357 NC P16 P16 ft BU 00 90 00
»^29-2 29-9 00 RD ft VCO 4P17 P17 ft GY 90 »COM
4*1 4-6 1BN 353 MG 1(WHEEL) 18-1 18-3 10 Y6 355 S.TR1G 129-3 29* 00 OR ft «3HEATER P18 P18 14 OR JACK FMIN
4-2
4-3
4-5 MRD 00 MG 118-2 18-2 00 •» ft M.TRIG 29-4 29-7 mY6 tf *• 2CONTROL P19 P19 12 RD tt FcM IN
4-4 •# OR 99 GNO 18-3 18-1 00 "# ft KBD TRACK 29-5 29* 00 GR ft -1P20 P20 14 RD 00 PORTA
4-4
4-5
4*
4-3 ff YE m-15V29* 29-5 00 BU ft VCO 4P21 P21 tt BN 00 GND
4*2 ff GR 90 BENO 19-1 19-8 12 —355 NC 29-7 29-4 90 PU 00 «3TEMP P22 P22 18 OR 00 ARP TRIG IN
4-1 #t BU 09 15V 19-2 19-7 09 RD tf FCM IN D29* 29-3 00 GY 00 •• 2CHECK P23 P23 5 BN 90 «TRIG U>
19-3 19* 00 OR 00 TRIG OUT 129-9 29-2 09 WT 00 «1
5-1
5-2
5-3
5-4
5-5
5-8 2BN 353 ARPSW 19-4 19-5 00 YE 00 TRIG OUT !| 29-10 291 ff BL 00 HEATER-COM HI HI 21 KLM-354 HEATER-COM
5-7 f# 00 00 VCOI/SLAVC OSC (BENO) 19-5 194 09 GR 09 TRIG IN |H2 H2 09 i00 vcot
5-6 99 MmPITCH (BEND) 19* 19-3 09 BU 90 TRIG IN I30-1 30-3 22 BU 357 -15V H3 H3 ft VC02 TEP
5-5 00 ** 00 VCOI /SLAVE OSC IMG 11 19-7 19-2 09 PU 00 TRIG IN (From JACK* 30-2 30-2 «BL 09 GNO H4 H4 ft VC03 CHECK
54 99 09 00 PITCH (MG1) 19-8 19-1 90 GY 00 TRIG IN (to JACK) 130-3 30-1 ff RD 00 15V H5 H5 ft VC04
5*
5-7
5-8
5-3 90 00 00 MG1 OUT H6 H6 ft VCOl
5-2 90 00 00 PWM (MG 2) 20-1 20-3 10 YE 356 ST 131-1 31-4 4BL 376 GND H7 H7 tt VC02 HEATER
5-1 M90 09 PWM(MG 1) 20-2 20-2 99 ft uMT 31-2 31-3 f# ff ft 90 H8 H8 ft ft VC03 CONTROL
20-3 20-1 00 00 00 KBD TRACK 31-3 31-2 ff BU ft -15V H9 H9 ff tf VC04
6-1
6-2
6-10 6OR 353 ARP RESET 31-4 31 -1 99 RD 09 +15V
6-9 00 00 00 COM 21-1 21* 7BN 356 SWCOM SI SI 9TACTSW EFFECT LED
6-3 6-8 Mm»00 ARP ON 21-2 21-5 00 RO 00 SW POLY ji 32-1 33* 13 8L 376 GNO S2 S2 tf 09 LED -
6-4 6-7 09 #4 09 LATCH 21-3 214 90 OR 00 SW U/S 32-2 334 90 00 09 00 S3 S3 800 LEO HOLD
6-5
6-6
6-6 00 00 99 DOWN 21-4 21-3 00 Y6 00 SW UNISON 132-3 33-3 00 OR 09 5V S4 S4 ff 00 '• CHORD
6-5 00 99 00 UP/DOWN 21-5 21-2 00 GR 00 SW CHORD 32-4 33-2 00 BU 00 -15VS5 S5 ft 00 -UNISON
6-7 6-4 M** Pi UP 21-6 21-1 09 BU 00 SWHOLD 32-5 33-1 ft RD ff 15V S6 S6 ft 90 00
6-8
6-9
6-10
6-3 00 00 00 10CT S7 S7 tf 09 »POLY
6-2 00 #00 2OCT 22-1 22-14 20 356 K14 32-1 32* 17 'BL 376 GND S8 S8 ft 09 -COM
6-1 00 M00 FULL 22-2 22-13 90 04 ••13 32-2 32-5 99 ft 99 09 S9 S9 990 EFFECT SW
^^r ^22-3 22-12 99 04 -12 |32-3 324 09 OR ft 5V S10 S10 00 99 tt tt
7-1
7-2
7-3
7-6 17 BL 354 GNO 22-4 22-11 00 If -11 |l 32-4 32-3 ffBU tf BU S11 S11 740 SWHOLD
7-5 00 90 ** 94 22-5 22-10 00 04 »10 i; 32* 32-2 09 RD 90 RD S12 S12 ft 90 "CHORD
7-4 09 OR 99 5V 22-6 22-9 00 09 -9 i! 32* 321 tr »t ft RD S13 S13 00 99 »UNISON
7-4 7-3 00 BU 0W -15V 22-7 22-8 00 90 -8 !S14 S14 09 09 «• UNISON/SHARE
9^^
7-5
7-6
7-2 00 RD 09 15V 22-8 22-7 90 00 »7 I34-1 34* 19 BL 376 GND S15 S15 00 99 -POLY
7-1 90 RO 00 90 I22-9 22* 00 09 »1 |34-2 34* mm ft f# tf S16 S16 90 90 •• COM
w*
I22-10 22-5 ft 00 ••2 34-3 34-4 40 OR ft 5V .
8-1
8-2
83
8-3 14 BN 354 PORTAGNO-P21 22-11 22-4 *00 ••3 I34-4 34-3 90 00 ft 00 A1 A1 23 354 VCOl AMP OUT
8-2 00 RO 00 PORTA-P20 22-12 22-3 00 90 »4
134-5 34-2 09 BU #f -15VA2 A2 90 tt *• IN
8-1 90 OR 9* FMIN-P18 22-13 22-2 00 40 "5 |34* 341 90 RD ff 15V A3 A3 90 VC02 «OUT
*^ *2214 22-1 00 99 ••6 A4 A4 09 «IN
9-1
9-2
9-3
9-4
9-4 9BN 354 EFFECT SW 35-1 35-3 22 BU 376 -15V A5 A5 90 VC03 •» OUT
9-3 tf RO ft $0 23-1 23-10 6OR 356 ARP RESET I35-2 35-2 ff BL 00 GNO A6 A6 t# IN
9-2 00 OR 00 EFFECT LED- 23-2 23-9 ft •1»t COM [35-3 351 #t RD 00 15V A7 A7 99 VC04 »OUT
9-1 00 YE 00 •• 23-3 23-8 -If 49 ARP ON A8 A8 tt «IN
**" »23-4 23-7 00 *00 LATCH 39-1 39-11 23 RD 398 16V A9 A9 09 -15V
10-1
10-2
10-3
10-4
10-5
10-8 2BN 354 ARPSW 23-5 23* #* •f 09 DOWN 39-2 3910 ff BL t# GNO A10 A10 00 GND
10-7 00 tf 00 VCOVSLAvCOSOBENOf 23-6 23-5 90 09 09 UP/DOWN 139-3 39-9 •t BU 99 -15V All All 00 15V
104
10 5
00 00 00 PITCH (8END) 23-7 234 m00 00 UP 394 39* ff YE 90 VC04 AMP IN
00 00 00 VCOl/SLAVC OSC (MG tl 23-8 23-3 00 90 09 10CT 39* 39-7 ff GR 00 •• OUT
104 00 00 00 PITCH (MGU 23-9 23-2 00 00 00 2OCT 39* 39* t# BU 90 VC03 •• IN
1v/ »*
10-6 10-3 00 09 00 PWMMG1 23-10 23-1 09 99 99 FULL 39-7 39* f» PU 00 .. OUT
10-7
10-8 10-2 00 00 •9 PWMMG2 ^k &&^M 39* 39-» ff GY 99 VC02 «IN
10-1 09 90 00 PWMMG1 24-1 24* 8PU 356 GND 39-9 39-3 ff WT 90 »OUT
™^^F *24-2 24-5 ft GY 09 LED HOLD 39-10 39-2 ff BL ft VCOl •• IN
12-1 12-4 16 PU 354 CV4 124-3 244 MWY 99 LED CHORD 39-11 39-1 *f PK 90 .. OUT
12-2 12-3 mft 00 CV3 24-4 24-3 09 81 00 LED UNISON »»^^^^ ^^^
12-3 12-2 w00 90 CV2 24-5 24-2 •9 PK 00 LED U/S 4\ 1
2
£09^ j^h ^k K6
K5
12-4 12-1 M00 90 CV1 24-6 24-1 90 LB 99 LED POLY i
220
ff K8D tt
13-1
13-2 13-8 13-7 IS
ff BU 354 NC
GATE 425-1
25-2 25-8 25-7
25*
25-5
25-4
253
25-2
251
26*
26-5
264
26-3
15
90 8UWW 356
00
NC
GATE 4
3
43
4ff
09
ft
40
K4
K3 NOTE
13-3
13-4 13* 13-5
ft
09
09
00
00
00 GATE 3
GATE 2
$m 09 9h
125 3
25-4
00 00
09
09
99
GATE 3
GATE 2
5
65
6
40
90
99
00
K2
Kl BROWN -BN PURPLE -PU
13-5
13-6
13-7
13-8
14-1
14-2
14-3
14-4
145
134
13-3
13-2
13-1
145
144
14-3
14-2
14-1
•0
00
09
tt
ii
40
00
M
##
00
00
•
tf
GR
00
00
00
00
00
00
•
00
354
00
00
00
90
GATE 1
EFFECT ON
NORMAL
OCT UP
VCOTRIGIN
NOISE
FMEG
PWM EG
VCOSIGOUT
i**9 ^
25-5
25*
25-7
25-8
26-1
26-2
126-3
I264
00
if
09
90
19
*#
ft
M
90
00
09
09
8L
09
OR
90
tf
49
99
ft
356
ff
99
"
GATE 1
EFFECT ON RES T
NOR
UP
G2
G1
5
5
7
8
9
10
ii
12
13
14
7
8
9
10
11
12
13
14
00
99
ff
ff
•1
tf
90
•0
00
90
•..
99
40
90
99
99
K7
K8
K9
K10
K11
K12
K13
K14
RED
ORANGE
-
YELLOW-
GREEN -
BLUE -
RD
OR
YE
GR
BU
GRAY -GY
WHITE -WT
BLACK -BL
PINK -PK
LIGHT BLUE- LB
18

7. SEMI-FIXED RESISTORS DIAGRAM
©©
DR-4 VR-5
KLM-353
KLM-398
VR1 VR3
©VR2 VR4
VR15
KLM-354
VR403 VR401
©©©©.©
VR402 VR404 VR301
VR303
©©©
VR302 VR304
VR203
©©©
VR202 VR204
VR103
•©©©VR201
VR102 VR104 ©Q)
VR101
VR11
VR10
VR19 (T)
©© ^©
VR18 VR4
©
©
VR3 KLM-355
KLM-327 ©
VR-3
VR-2
KLM-376
LOW HI
©©
MID VR-2 VR-1
©
VR-3
KLM-356
KLM-372
19

8. ADJUSTMENT PROCEDURE
Caution: This unit has been precisely adjusted at the factory before shipment. Therefore, absolutely do not turn any
variable resistors other than those required for servicing. Furthermore, please allow thirty minutes of warm-up
time after turning on the power before beginning check or adjustment. Please refer to the separate VR location
chart.
Cs
Normal setting
1. POWER SUPPLY adjustment (KLM-376).
Connect DVM to KLM-356; GND is J12.
1) -15V: Check J11 with DVM and confirm -15V
(±0.01V).
Adjust KLM-376 VR-3 if necessary.
2) +15V: Check J40 with DVM and confirm +15V
(±0.5V).
3) +5V: Check left side of R54 (J39) with DVM and
confirm +5V (±0.02V). Adjust KLM-376 VR-2 if
necessary.
2. KEY ASSIGNER adjustment (KLM-356).
1)Assignor slope.
CV1 output: Short the TUNE POINT; connect
DVM to right side of KLM-356 R8 (GND is J12);
change TRANSPOSE SW position in the order UP
-* DOWN -» NORMAL and adjust to obtain the
values shown in the chart.
TRANSPOSE VR CV1
UP HI ADJVR-1 +10.583 ±1mV
DOWN LOW ADJVR-2 +0.000 ±1mV
NORMAL MIDADJVR-3 +5.250 ±1mV
2) Open the TUNE POINT and confirm keyboard CV
as shown.
KEY TRANSPOSE CV
Absolute value ±10mV
Slope ±2mV/Oct.
C2 DOWN 1.000V
C2 NORMAL 2.000V
C3 NORMAL 3.000V
C4 NORMAL 4.000V
C5 NORMAL 5.000V
C5 UP 6.000V
3. PITCH adjustment (stretch tuning) (KLM-354).
1) OFFSET adjustment
Check KLM-398 lead wire connection points with
DVM and confirm that each VCO offset voltage is
±0.1mV. Adjust the KLM-398 VR if necessary..
Color code:
VCO 1—Red
VCO 2—Yellow
VCO 3+Blue
VCO 4-* Gray
2) VCO-1 adjustment
Settings: VC01 LEVEL 10
VC02-4 LEVEL
MASTER TUNE center
TRANSPOSE NORMAL
DETUNE
WHEEL BEND, MG .VCF
Connect properly calibrated WT-12 to SIG OUT or
PHONE OUT and adjust as follows. Set WT-12 to
METER function and set chromatic dial to A#.
WT-12
OCTAVE VCO-1
OCTAVE KEY Meter
Indication
(centsfVR
M(L) 16' A*4 VR102
LL 16' A*, -7 (-5~- 10) VR103
M(L) 2' A*, VR101
HH 2' A#4+7(+5~+10) VR104
The 2' A#3and A#4pitch indications should ideally
be +4 cent and +7 cent, respectively.
20