Korg POLYSIX User manual

POLYSIX
CONTENTS
1. SPECIFICATIONS .
2. STRUCTURAL DIAGRAM .
3. BLOCK DIAGRAM .
4. CIRCUIT DIAGRAM ..
5. PC BOARD .
6. CONNECTOR FUNCTION.
7. SEMI-FIXED RESISTORS DIAGRAM
8. ADJUSTMENT PROCEDURE .
9. PARTS LIST .
1
2
3
4
5
17
18
19
24
PROGRAMMABLE 6VOC
SYNTHESIZER
SERVICE MANUAL
KEIO ELECTRONIC LABORATORY CORPORATION
TOKY O /JAP AN

1. SPECIFICATIONS
KEYBOARD . • 61 keys (C - C)
VOICES: 6
(Program and edit functions are possible for items marked *)
vco *.
SUBOSCILLATOR*
VCF* .
ENVELOPE GENERATOR*.
VCA*...
MODULATION GENERATOR*
EFFECT*.
KEY ASSIGN MODE .
ARPEGGIATOR .
TUNE .
BEND .
OUTPUT .
PROGRAMMER
TAPE INTERFACE
CONTROL WHEEL x 2
INPUT JACKS .
OUTPUT JACKS
DIMENSIONS .
WEIGHT .
ACCESSORIES INCLUDED
POWER CONSUMPTION
• Octave Selector (16', 8', 4')
• Waveform ( [\ , PW, PWM)
• Pulse Width/PWM Sensitivity Adjustment
• PWM Speed
• Off
• 1 oct Down
• 2 oct Down
• Cutoff Frequency Adjustment
• Resonance Adjustment
• Envelope Generator Modulation
• Sensitivity Adjustment
• Keyboard Tracking Adjustment (0 ~~ 150%)
• Attack Time
• Decay Time
• Sustain Level
• Release Time
• Mode Switch (EG,n_)
• Attenuator (~10dB~ +10dB, 11 Steps)
• Frequency
• Delay Time
• Level
• Modulation (VCO, VCF, VCA)
• Mode (Off, Chorus, Phase, Ensemble)
• Speed/Sensitivity Adjustment
• Poly
• Unison
• Chord Memory
• Hold
• Speed
• (0.4Hz ~ 40Hz)
• Range (Full, 2 oct, 1 oct)
• Mode (Up, Down Up/'Down)
• Latch (On/Off)
• Arpeggio (On/Off)
• ±50 Cents
• Sensitivity Adjustment (MAX ±1300 Cents)
• Level Selector (Off, Low, High)
• Volume
• Bank (A, B, C, D)
• Program (1 ~ 8)
• Write (Enable, Disable)
• Switch (Enable, Disable)
• To Tape
• From Tape
• Verify
• Error/Cancel
• Tape Indicator x 2 (Found, Loading)
• Bend
• MG
• From Tape (With High/Low Switch)
• Chord Memory Qgno)
• Arpeggio Trigger In (1
• VCF fcM In (-5V ~ +5V)
• To Tape (With High/Low Switch)
• Headphone
• Output
• 980 (W) x 373 (D) x 132 (W) mm
• 11.5kg
• Connection Cord
® Plug Adaptor (Phone-To-Mini)
• Memory Cassette
• Voltage (Local Voltage 50/60 Hz)
Wattage (25 W)

EFEECT
OFF
CHORUS
PHASE
ENSAMBLE
ATTENUATOR

4. CIRCUIT DIAGRAM
KLM-366 KEY ASSIGIMER (OLD PRODUCTION)
4

KLM-366 SYNTHESIZER (OLD PRODUCTION)
5

KLM-366 {NEW PRODUCTION)
(KLM-366 includes KLM-396)
i-*
co
O-J
HNd
O -l
TO
KLM-368
TO
" KLM-376
6

KLM-367
cm t
TO KLM - 30?
GND
(cWTTT )—i
DATA ^
tCNIl-2
ICS
>/2 393
CN03
TO KLM -368
DIO D9 \
m IC22
MPD804-8C
C22
10P C E
C23
22 P
CE if?
□
+ 5V
XI
6 MHZ
40
26
20
DU
CN02
TO KLM-376
10U,
DBO
TO
DB 1
DB2
XTALI
DBS
XTAL2
DB4
DBS
Vcc
DB6
DB7
Vdo
P10
PH
PI2
Vss
P13
P/4
EA
PI5
P16
PI 7
SS ALE
NR
REST
RD
Tnt
P20
P2I
Tl
P22
P23
P24
P25
P26
P27
+ /5V
(CNOZ-'iy
16 V
x 4-
C (C3I, C38
C39, C4-I)
O.OtyuCE x 4
+ 5V C7&
0 CN02-2) -
&N D d
(CN 02 - 3 ) - ■
-5V C2
(C NO 2-43 -
- 15 V 66 4 *
0CN02-S ) —
GNDA
( CN 02 - 6 ) —
+ SVA
(CN 02 - 7 )—
+ 5V
~rh
\-5V
-15 1 /
• \+5VA\
CN08
TO REAR PANEL
IC2I
13600
339
© +5
7 2-5
IC5
393
IC6
393
1C20
13600
© f 15
© - 1 5
® + 5
@ 6ND
© + /5
®-15
® *-5
© -5
—— (CN05 19)
CNO-5
TO KLM- 366
7

KLM-368 EFFECT

SE

KLM-376, 375 425
POWER
SW
KLM-372AI
rFUSE. T T
CN 2 0 O
SPA R K
KILLER
Ptiizm nsn
OR I
A/YE ZbSPjCPH I
<S—<§!
i TA-OOI
T8-001
OP
I TA-005
T3-005
KLM - 4 25
I
SPARK
KILLER
POWER
TA-005
T3-C>05
KLM”37 6A — RS
FUSE
1A
FUSE
1A
D2,3,4,5
---1S-1885
D1 LED
LT8001P
TH1 THERMISTOR
TD 5 - A 150 DA
TA
TB
VOLTAGE
100 V
120 V
220V
240V
3 BROWN
ORANGE
YELLOW GREEN
4
WHITE
WHITE
NC
ORANGE
BROWN
GREEN
YELLOW
ogllAv 2>SB744AP^a
2S/\733 I—.iB
R15 7|
► ——-VW-f-"——
130n
+ +C11
zC14 A: zzICf
4700 £12 2 $
CE 1 I c 2
M5230L
+ I +C 6
LC13 =L zzio
220 Qg C7 nPj
- 3 5 V 0.0 ^
Cc 4
--A/W-i- —
R 4
130n
Q7
2SC945
R12
0.5ii 1/2w
Q3
2SD794APpi.Q
CN01(BR) ^
TO KLM-366
+Mj—CHEDl
Tgvl — fflfT)
R13 C8
243n IJt.
196 ^qV
CIO'
100^
A
R3
_ 47.K _
Q 2 TSfl R2 y
2SD794A IfiF
r- -—«
>r-.
"at
C 10 F"
t
D 1
i IS
>243
cvj CM
gfot- ,
>CM>, 5
^ >
S <
a k
1+15V] I Q5 1
6rT0 < 2SC945
^\72R6
■ ' C 4 “
IC 1 0.0 Im-
2 p 1/2 455? CE
JIG
C5 I I
100 GND
16 v
Ignd A^
EIv^dedI
CN02CRE) |
TO KLM-367
-615V — 002-1) |
;9 Efg Ci
)> A ic
10O R9 R5 VR1
4.87K 3.24 ft fo[££L.220 a
1 % T ^ v '“cw vV ''
2r^
- G ND] . .
GND A'
IC1
1/2 4555
R4
,-^niK
HA I Q 6
rrEn 42SA733
CS r— 1 T(
0.0 I ‘
bAc2 I e
zzz iOOA' [7
! A tei
CN13 CGY)
TO KLM-369
-/ *—4^VVW-
Q1 P<*^
2SB744A i P j/2w-
CN15 (BlO
TO KLM-368
F15V
GND
CONNECTOR
10

1Z3DEXZM
p. YY
So DO 2
6. D03
CH05 *?P

KLM-368 EFFECT
CNI4 Z (3 m
PS m m «-
CNiS *j
N<<* R| 15
">? VW
.VR8 CNI6
LEVEL ^
324 R 1 ®6
-1 AAAr
RIOS
IQ “VvV
_/R I
AAAr
C80A ™ __
: vw
R I 55
■ VvV
R 156
-AAV
R I 8 I
-AAAr
R I 82
■ VvV
R I 83
wv
R I 84
c) -VW
J S?0
» D24
"V „ 025
R 43 K_____V
AW C27
R44
_VvV
Q2 VW C3 I
/ " ' \ R4 a
( ) AAAr
—w 5 c r :cdi l
) VW CI8
—-' R 9 I
^AV VW
AAAr WV
18 RIO I
VW «|
R I 14
C82
VW Rise
VW R 189
— ■ — JS8
VW Rf 90
VW
R I 23
VW
AW
VW
"x R25
VW
"X R45
AAAr
vw
R26
vw
R93 R92
VW
J2S
VW
R28
J29
R94
AAV
R96 C66
AAAr 1
■ (—) vw
Vo 'R97 R227
VW •
( )QI9 (
^vw -
R95
vw
■ AAAr
R I 2
AW.
R32
AAAr.
8 C79
R 1 70
AAAr
AW
R I 32
R I 35
Vw
R72
VW
R73
AAAr
P^- 11—J
TP2 R55 AAAr
O R54 VW
5 C35/\ j
R74
AAV
R1& D M R
AAAr
AAAr
R I 36
R I 73
AAAr
R I 78
VVV
R ! 76
VW
AAAr
^ 7
AAAr
J40 CC^ CK'
R (Of
AAAr
R 102
VW
r 103 <n <n
AW
R209
VW
R2 I 0
VW
CN03
vw
R I 40
VW
R I 4 I
-AAAr
R I 79
J48
+ R §5^ IC9
s fSsTi
o AAAr
AAV
AAV
105 RI 20
RI 43
AW
gWV
vw
R I 46
VW
gWV
vw
AAAr
R84
vw
R2I6
13

KLM- 372
KLM-396
Oq
a gy
Q N
UJ <
3 X
H a
g-
o h-
A- 00
9£ z
£<
2<
2z
f— CD
Dh
<q
Oh
i *
3 uj
3 .
O— 1
UJ
oz
H o
a
uj
a.
UJ
2
UJ
O
<
tJLi
O
CD
tn
CM
UJ
a
>
H
UJ
2
<
co
UJ
X
H
CL >
uj a
a uj
CO
a
Hi
ll. H
iii uj
a: ll a. >
LU
o
<
UJ
CO
3
Ll,
TH
a LaJ
UJ H
3 UJ
COS
CO <
< n
©s $il» 8 ss*»
q cr
UJ
z a
<r z
9
Z L ,
Ouj
r* h
a
LaJ Q»*»
t UJ
1"*“ Z
ZD
uj a z
.Q UJ UJ
1x1 ^ z
a uj
uj a
o>
<£ j—
o r 1
Z 9:
X
o
hiD y
a •“
co UL
LjJ
3
O
CO
a
co
UJ
uj a z
a uj 3
§—» CO
z 52 a
O < <
QJQ.
a
2
uj
a
UJ
UJ
UJ
O
UJ
m
co
3
. a
UJ
a __ —
UJ LD
< a
ZD <r uj
OCL Q
!2>*
CD
TO'
NC
KLM-425
16

6. CONNECTOR FUNCTION
P.C.B.
TO
CONNEC¬
TOR
COL¬
OR
P.C.B.
CONNEC¬
TOR
FUNCTION
TO
CONNEC¬
TOR
COL¬
OR
P.C.B.
CONNEC¬
TOR
FUNCTION
P.C.B.
TO
CONNEC
TOR
COL¬
OR
,,
10
KLM-369
11- 4
C
■
5
,,
KLM-371
J35 1
D07
KLM-371
J35 1
>>
9
<<
5
INH1
6
> ■
2
PI 2
-3 "
2
"
8
<•
6
IN H2
7
3
+5
..
3
7
"
KLM-369 13- 1
+ 15
■ M ™ ns»
13- 1
GY
4
GND
n
4
KLM-366
6
GR
2 +5
2
</
5
TE
/.
5
"
5
"
3
GND "
3
KLM-376
01- 1
+15
KLM-366
01- 1 BR
"
4
4
-5 "
4
> ■
2 +5
"
2
• >
"
3
"
KLM-369
13- 5
-15
KLM-376 13- 5
GY
3
GND
"
3
,,
"
2
••
KLM-369
15- 1
NC
KLM-368 15- 3 BK
4
-5
"
4
> ■
"
1
"
2
GNDA
"
2
KLM-376 01- 5
-15
KLM-366 01- 5
BR
KLM-369 06- 1
BL
3
SIG IN "
1
' ■
6
GNDA
-
6
"
2
"
KLM-369
201- 1
INH-1
KLM-370 201- 1
7
+5
»
7
,,
"
3
" ;
2
DATA
„
2
KLM-376
02- 1
+ 15 KLM-367
02- 1 RE
"
4
"
3
A
„
3
2 +5
n
2
,,
"
5
"
4 B
,,
4
3
GND
./
3
,,
" 6 "
5
C
„
5
4
-5
..
4
,,
"
7
6
GND
n
6
5 -15
u
5
,,
"
8
7 -5
„
7
6
GNDA
"
6
,,
"
9
8
+5
,,
8
7
+5
„
7
,,
"
10
"
9 P10
1,
9
KLM-376
13- 1
+ 15
KLM-369
13- 1
GY
REAR BR
10 P11
,,
10
2
+5
2
,,
PANEL
RE
11
PI 2
11
3
GND
,,
3
,,
"
OR
12
PI 3
,,
12
4 -5
4
,,
" —
13
D03
,,
13
5
-15
5
,,
KLM-371
10- 1
BR
14
D02
,,
14
KLM-376
16- 1
+ 15
KLM-368 16- 1 BK
-2 " 2
RE
15 KBD-TRACK
• •
15
2
GND
-
2
"
3
OR
KLM-370
201 - 1
INH-1
KLM-369
201- 1
3 -15
"
3
"
4
YE
2 DATA
,,
2
"
5 GR
3
A
,,
3
"
6
BL
4
B
,,
4
"
7 PU
5
C
,,
5
"
8
GY
6
GND
,,
6
"
9
WH
7
-5 7
"
10 BK
8 +5
„
8
"
11 BR
9 P10
„
9
"
12
RE
10 P11
,,
10
"
13 OR
11 P12
,,
11
"
14
YE
12 PI 3
,,
12
"
15
GR
13
D03
„
13
"
16 BL
14
D02
,,
14
"
17
PU
15 KBD TRACK
„
15
KLM-369
PU
11- 1 PU
KLM-371
10- 1 D03
KLM-367
10- 1 BR
2
2
D02
"
2
RE
Q
3
DOI
"
3
OR
4
DOO
"
4 YE
5
5
P13
"
5
GR
a
6 P12
"
6
BL
KLM-367
03- 7
OR
7
P11 "
7 PU
6
8 P10
" 8
GY
5
9
D04
«
9
WH
4
10
D05
"
10
BK
3
11 D06
"
11
BR
„
2
■ r '
12
D07
"
12
RE
13 P26
"
13
OR
KLM-366
14- 1
WH
14
P27
"
14
YE
?
15 +5
11
15
GR
3
..
16
GND
"
16
BL
KLM-369
15- 3
BK
17
TE
"
17 PU
„
2
,,
KLM-371
12- 1
ARPE
KLM-366 12- 1
BR
,,
1
,,
2
POLY
"
2
RE
KLM-376 16- 1
PI
3
UNISON
"
3
OR
,,
2
4
CHORD
"
4 YE
„
3
n 5
HOLD
"
5 GR
KLM-367
06- 1 BL
6
PI 7 "
6
BL
,,
2
ii
7
P16
"
7
PU
,,
3
, ,
8
PI 5
"
8
GY
,,
4
,,
9
P14
"
9 WH
,,
5
„
10
P13
"
10 BK
6
ti
11 PI 2
"
11 BR
,,
7
12
P11
"
12
RE
} ,
8
13 P10
..
13
OR
9
14
P20
<•
14 YE
ff
10
15
P21
15
GR
REAR
BR
16
ACKR " 16 BL
PANEL
RE
17 ACKI
"
17
PU
„
OR
KLM-371
J3 1
+5
KLM-371
J3 1
NOTE
„
YE
2
GND
-
2
/<
GR
3
ARP
»
3
BROWN -»
BN PURPLE -+ PU
CONTROL
BR
4
POL 4
PANEL
RE
5
UNI
"
5
RED ->
RD GRAY
-+ GY
„
OR
6
CH
6
„
YE
7
HO
7
ORANGE ^
OR WHITE
-> WT
,,
GR
8
P17
"
8
„
BL
9
P14
9
YELLOW ->
YE BLACK -+ BL
KLM-367
11- 1
PU
10 P12
"
10,
,,
2
„
11 P11 11
GREEN ->
GR PINK
-* PK
,,
3
„
12 P10 12
"
4
13
P20
"
13
BLUE -> BU LIGHT BLUE -+ ■
LB
P.C.B.
CONNEC¬
TOR
FUNCTION P.C.B.
TO
CONNEC¬
TOR
COL¬
OR
P.C.B.
CONNEC
TOR
FUNCTION
KLM-366
KLM-366
KLM-366
KLM-366
KLM-366
KLM-366
KLM-367
KLM-367
KLM-367
01 - 1
2
3
4
5
6
7
04- 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
05- 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
12 - 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
14- 1
2
3
1
2
3
4
1
2
3
4
5
6
7
03- 1
2
3
4
5
6
7
05- 1
2
3
4
5
6
7
8
9
17-
02 -
+ 15
+5
GND
-5
-15
GNDA
+5A
PI 7
P16
PI 5
P14
PI 3
PI 2
P11
P10
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
IR
8 '
4'
ST
TE
KBDTRACK
VCF MOD/CUTOFF
VCO MOD
PW/PWM
EG INT
RESO
ATTACK
DECAY
SUSTAIN
RELEASE
,/T
SUB 1/2
SUB OFF
EG MODE
ARPE
POLY
UNISON
CHORD
HOLD
PI 7
P16
P15
PI 4
PI 3
PI 2
P11
P10
P20
P21
ACKR
ACKI
SIG OUT
GND A
NC
ACKI (IN)
CHORD
Fc MOD IN
ACKI (OUT)
+15
+5
GND
-5
+ 15
GNDA
+5A
EFF-SP/INT
CHO
PHA
ENS
VCA MOD
P-VOL
RESO
EG MODE
SUB OFF
SUB 1/2
y\
RELEASE
SUSTAIN
DECAY
ATTACK
RESO
KLM-376 01 - BR
KEY¬
BOARD
KLM-367
KLM-371
KLM-368
REAR
PANEL
KLM-376
KLM-368
KLM-366
05- 19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
12 - 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
14 - 1
2
3
02 - 1
2
3
4
5
6
7
03- 7
6
5
4
3
2
1
05- 19
18
17
16
15
14
13
12
11
GR
BR
RE
OR
YE
GR
BL
PU
GY
WH
BK
BR
RE
OR
YE
GR
BL
PU
WH
BR
RE
OR
YE
RE
KLM-367
KLM-367
KLM-367
KLM-367
KLM-368
KLM-368
KLM-368
KLM-368
KLM-369
KLM-369
KLM-369
KLM-369
10
11
12
13
14
15
16
17
18
19
06- 1
2
3
4
5
6
7
8
9
10
08- 1
2
3
4
10- 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
11 - 1
2
3
4
5
6
7
03- 1
2
3
4
5
6
7
14- 1
2
3
15- 1
2
3
16- 1
2
3
06- 1
2
3
4
5
6
7
8
9
10
07- 1
2
3
4
5
09- 1
2
3
4
5
6
11 - 1
2
3
EG INT
PW/PWM
VCO MOD/CUTOFF
VCF MOD
KBD TRACK
TE
ST
4'
8 '
IR
MOD
LFO
DOO
DOI
D02
D03
P10
P11
P12
P13
TO TAPE
GND
FROM TAPE
GNDA
D03
D02
DOI
DOO
PI 3
P12
P11
P10
D04
D05
D06
D07
P26
P27
+5
GND
TE
GND
DATA
A
B
C
INH1
IN H2
RESO
P. VOL
VCA MOD
ENS
PHA
CHO
EFF SP/INT
SIG IN
GNDA
NC
NC
GNDA
SIG OUT
+15
GND
-15
MOD
LFO
DOO
DOI
D02
D03
P10
P11
PI 2
PI 3
GND
PHONES
PHONES
DATA
SIG OUT
-5
BEND
+5
GND
VIB
LFO
DATA
A
B
17

? a SEMI-FIXED RESISTORS DIAGRAM
KLM-368
VR6 VR8
000®
VR5 VR7
0 0 0
VR1 VR2 VR3
KLM-367
VR1
0
KLM-366
1UNIT 3UNIT 5UNIT
-OUNIT-2UNIT-4UNIT-
r~VR8T I T I-T-1
I 0001000
I I
VR6 VR7
l l
I I
VR1 VR2 VR5
0 0 000 vR^ 9 0 " d
0 0!Q® !®®
SW1 VR3
VR6VR4VR2
N°RMA L Q Q) Q
TEST 00®
VR7 VR5 VR3
VR4
VR11
VR12
((*) VR2, VR13, VR14, VR15^ NEW PRODUCTION.)
8

8. ADJUSTMENT PROCEDURE
Caution: This unit has been precisely adjusted at the factory before shipment. Therefore, absolutely do not turn any of
the variable resistors other than those required for servicing. Testing and adjustment should be performed only after
allowing the unit to warm up for ten minutes. Variable resistor locations are marked on separate charts.
* The following are required for the test procedures:
Digital voltmeter (DVM) 4-1/2 digit
Oscilloscope
Tuner Korg WT-12, etc.
Audio amp and speaker, or headphones.
1. Please check the following before proceeding.
1) Check all connections to make sure they are correct
and secure.
2) Check memory back-up battery voltage. KLM-367
circuit board battery voltage should be 3.60V~4.10V.
2. Power supply check and adjustment (KLM-376).
Use a DVM to check the following test point (TP)
voltages. (Obtain ground in front of LED.):
1) +15V for TP-J7. Adjust VR3 to obtain +15.000V
±50mV.
2) -15V for the right side of TP-R18. Confirm -15.000
mV ±3Q0mV.
3) +5V for TP-J2. Adjust VR2 to obtain +5,000 ±10mV.
4) -5V for TP-J1. Adjust VR1 to obtain -5.000V ±10mV.
3. KLM-367 check and adjustment.
(1) R e set circuit.
With controls at the normal setting (fig. 1), connect a
dummy 56kohm 2P (2-pin) connector to the KLM-376
2P plug (male). If connector not available attach 56K
resister with small test clips (E-Z-Hook or Similar)
o
TUNE
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OCTAVE WAVEFORM PW/PWM PWM SPEED SUB OSC
vco
(To) (¥) (tT) ®
CUTOFF RESONANCE EG INTENSITY KBD TRACK
VCF
K ©
MODE ATTENUATOR
VCA |
o
INTENSITY
BEND
o ® ® ® Si
FREQUENCY OELAY LEVEL MOD
MG
(T) (T) (jo) (¥)
ATTACK DECAY SUSTAIN RELEASE
EG
(of) (T)
MODE SPEED/INTENSITY
EFFECTS
Fig. 1 Normal setting.
1) Turning VR1 from the counterclockwise position
towards the clockwise direction, adjust so that the
BANK A~D, MANUAL, TAPE ENABLE, and
PROGRAM 1 ~ 8 LEDs all light up (instead of only
BANK A and PROGRAM 1).
2) Confirm that only the BANK A and PROGRAM 1
LEDs light up when you remove the 56kohm 2P
connector.
(2) D / A adjustment.
1) Set MANUAL to ON, CUTOFF to 10, and EFFECT
INTENSITY toO.
2) Set circuit board SW1 to TEST position.
3) Confirm that PROGRAM LEDs 1 & 8 alone light up
when the TAPE SW is switched back and forth
from DISABLE to ENABLE and back to DISABLE.
4) If LEDs other than 1 and 8 light up, adjust VR6
(offset) and VR7 (width) so that only 1 & 8 light up.
5) Turning VR7 clockwise, adjust so that the lit LEDs
shift to 1 & 8. In the shift from 2 & 7 to 1 & 8
there may be some time lag between the two. If this
is very large, adjust VR6 to minimize it.
OIOOOOI o->® OOOOOOI
12345678 12345678
6) Switch the circuit board SW1 to the NORMAL
position. Confirm that LEDs 1 & 8 remain lit up
without any change.
7) Confirm that output DC click noise is within 6Vp-p
when power is switched off.
8) Turn power on and confirm that the BANK A and
PROGRAM 1 LEDs light up.
(3) M G adjustment.
Leaving other controls at the normal setting, set MG
FREQUENCY to 10, LEVEL to 10, and MOD SW to
VGA.
1) O b serve connector CN03-5 on oscilloscope.
Fig. 2.
2) Adjust VR2 to obtain 1 Vp-p (±5%) level; adjust VR5
to obtain frequency of 50Hz (20msec ±10%). If
these values cannot be obtained after replacing 1C
LM13600, adjust R78 and R52 respectively.
3) Leave the other controls at the same settings as
above, but change MG FREQUENCY to 0. Confirm
a cycle of 10 ~ 40 sec.
Leave other controls at same settings but change
MG FREQUENCY to 4, and DELAY to 10. Confirm
that the waveform appears 8 ~ 12 seconds after a
key is depressed.
Fig. 3. (LEVEL 1 Vp-p; frequency about 10Hz.)
(4) P W/PWM check and adjustment.
Set waveform to PW and PWM SPEED to 0, and
PW/PWM to 10.
1 ) Connect oscilloscope and DVM to CN05-11.
2) Adjust VR3 to obtain +2.2V (±1%).
3) Change WAVEFORM to PWM and PWM SPEEDto 10.
Adjust VR4 to obtain a frequency of 20Hz.
Use resistor inseries with VR4 if adjustment cannot
be obtained in the same way as for the MG.
4) A t this time confirm that there is a DC component of
+0.2 ~ +0.5V.
4. KLM-366 check and adjustment. Obtain ground at
TPS.
(1) VCF offset adjustment.
Leaving other controls at standard settings, set WAVE¬
FORM to PW and PW/PWM to 10.
1) Use oscilloscope or DVM to check Q5 (2SC945)
collector.
2) Adjust VR7 to obtain OmV ±2mV.
3) Repeat steps 1 & 2 for units No. 0 ~ No. 5.
(2) VGA level adjustment.
Set OCTAVE to 4; leave others at normal setting.
1) Connect oscilloscope to SIG OUT (TP-1).
2) Play C3 and adjust VR9 to obtain a sawtooth wave¬
form amplitude of 1 Vp-p (±5%).
3) Repeat for units No. 0 ~ No. 5.
(3) VCF RESONANCE adjustment.
Set OCTAVE to 8, WAVEFORM to PW, and PW/PWM
to 10. Check CN05-7 with DVM and adjust to obtain
0.000V ±20mV.
Check CN05-11 with DVM and adjust RESONANCE VR
to obtain 8.000V ±20mV.
Leave other controls at normal setting.
1) Check SIG OUT (TP1) with oscilloscope and fre¬
quency counter.
2) Play any single key and adjust VR6 so that the
VCF waveform amplitude is 300mVp-p ±20mV.
3) Repeat for units No. 0 ~ No. 5.
(4) VCF fo adjustment.
Set RESONANCE to 10; leave others at same setting as
above (3).
1) Check oscillation frequency with frequency counter
and tuner (WT-12, properly calibrated, chromatic
dial set to C). <
2) Adjust VR8 to obtain fo=523Hz (±10 cent).
3) Repeat for units No. 0 ~ No. 5.
4) Turn CUTOFF from 0 to 10 and check to see that
each unit's oscillation frequency is 10 ~ 25Hz at 0
and 19 ~ 24kHz at 10; amplitude should be at least
300mVp-p throughout.
(5) EG INTENSITY adjustment.
Set WAVEFORM to PW, PW/PWM to 10, CUTOFF to 0,
RESONANCE to 10, EG INT to +5. Leave others at
normal setting.
1) Check SIG OUT (TP-1) with oscilloscope and fre¬
quency counter.
2) Play any single key and adjust VR4 to obtain an
oscillation frequency of 5kHz (±500Hz) for units
No. 0 ~ No. 5.
3) Set EG SNT to ±3 and check to see that there is no
wide variation in pitch between units No. 0 ~ No. 5.
4) Set octave to 4', RESONANCE to 0, EG INT to ±5,
SUSTAIN to 0, DECAY to 5. Leave others at same
setting as 3) above.
Check to see that there is no click noise for units
No. 0 ~ No. 5.
(6) KBD TRACK adjustment.
Set OCTAVE to 16', connect DVM to CN05-6, and
adjust KBD TRACK VR to obtain ±1.6V.
19

Leave others at same setting as (4).
1) Cl ~ C2 should sound approximately like a scale.
2) Adjust VR5 if necessary,
(7) PITCH check and adjustment.
Set OCTAVE to 4'; leave others at normal.
1) Change circuit board slide switch to opposite position,
(away from VR1)
2) Play C6 and adjust VR11 to obtain Ocent.
3) Repeat step 2) for units No. 0 ~ No. 5.
4) Play C2 and adjust KLM-396 VR1 to obtain 0 cent.
Do this for one unit.
5) Set OCTAVE to 16', play C2 and adjust VR10 to
obtain 0 cent.
6) Repeat step 5) for each unit. (VR3 is used to adjust
for deviation of all units.)
7) Play Cl, C2, C3, C4, C5, and C6, and confirm that
each unit's deviation is within specifications.
(Refer to Poly-6 deviation standards.)
PS-6 VCO adjacent octave deviation standards at the final inspection at our factory
8) C heck to confirm that deviation between adjacent
octaves is within specifications, (for unit 0 only.)
(Refer to VCO adjacent octave deviation standards.)
±L
9) C onfirm that difference between 4' D^4 and E4 is
within 2 cents.
(Switch between POLY and UNISON and check unit
0 only.)
10) Switch SW1 to the front while playing C6 (stretch
tuning) and confirm +8 ~ +12 cent.
11) Confirm difference of no more than 2 cents between
4' G5 and G^5. Unit 0 only is OK,
12) Confirm that KLM-366'S VR1 is approximately in
the center position and not turned in the clockwise or
counterclockwise directions.
(8) EG TIME check and adjustment.
1) Attack time adjustment.
Check CN05-12 with DVM and adjust ATTACK VR
to obtain +0.9V ±20mV. Set SUSTAIN to 0; leave
others at normal setting.
2) Test top side of R143 10K with oscilloscope. (Set
sweep mode to normal.)
3) Set ARPEGGIO to ON, ARPEGGIO SPEED to 2.5,
LATCH to ON, and UNISON to ON.
4, Play any single key and adjust VR12 to obtain an
attack time of 250msec ±10msec. See fig. 5.
5. KLM-368 check and adjustment.
(1) HEADPHONE AMP OFFSET adjustment.
1) Use normal setting. Connect oscilloscope and DVM
to TP4 (GND is TP-6). Adjust VR6 to obtain offset
of OmV ±20mV.
(2) HEADPHONE AMP LEVEL adjustment.
Set OCTAVE to 4'; leave others at normal. Check point
is same as (1) above.
1) Play C3 and adjust VR5 to obtain a sawtooth waveform
amplitude of 0.3Vp-p (±5%).
2) Check to be sure there is no waveform distortion at
this point.
(3) OUTPUT AMP OFFSET adjustment.
Set WAVEFORM to PW, PW/PWM to 10, MG FRE¬
QUENCY to 7, LEVEL to 10, and MOD to VCA.
Check SIG OUT (TP-5) with oscilloscope.
1) Adjust VR7 to minimize waveform amplitude. See
fig. 6.
Less than 0.2 Vp-p
5) Repeat steps 2) ~ 4) for units 0 ~ 5.
6) Set ATTACK to 10; leave others at setting 1).
Repeatedly play a single key and confirm that dif¬
ferences between the fade-out of the six notes are
within 5 seconds and that all fade out within 15 ~ 25
seconds.
7) DECAY TIME check.
Set OCTAVE to 4', WAVEFORM to PW, PW/PWM to
10, CUTOFF to 2, RESONANCE to 10, EG INTEN¬
SITY to +3, DECAY to 8,SUSTAIN toO, ARPEGGIO
to ON, ARPEGGIO SPEED to 1 ~ 3, LATCH to
ON, and KEY ASSIGN MODE to POLY. Leave
others at normal.
Listen to each unit and check to see that there are
no deviations.
8) RELEASE TIME check.
Set DECAY to 0, SUSTAIN to 10, and RELEASE
to 8; leave others at same as 7) above.
Listen to each unit and check to see that there are
no deviations.
Fig. 6
(4) OUTPUT AMP LEVEL adjustment.
Set OCTAVE to 4'; leave others at normal.
1) Play C3 and adjust VR8 to obtain a sawtooth wave¬
form amplitude of 3Vp-p (±5%).
2) Confirm that click noise occuring when power is
turned off is less than volume of sound made by
playing C3. DC click noise amplitude should be no
greater than 6Vp-p.
(5) BBD CLOCK adjustment.
Set EFFECTS MODE to ENSEMBLE, SPEED/INTEN¬
SITY to 10. Leave others at normal.
1) Check TP-1 with oscilloscope.
2) Adjust VR1 to obtain maximum clock cycle of
30jusec. See fig. 7.
r
t
15 V
_L
I 25 ~ 30 m sec '
Fig. 7
3) Check TP-2 with oscilloscope.
4) Adjust VR2 to obtain maximum clock cycle of
30iUsec.
5) Check TP-3 with oscilloscope.
6) Adjust VR3 to obtain maximum clock cycle of
SO/isec.
20
21