Korg Trident MK1 User manual

PERFORMING KEYBOARD
SERVICE MANUAL
CONTENTS
1. SPECIFICATIONS. 1
2. STRUCTURAL DIAGRAM . 2
3. BLOCK DIAGRAM. 3
4. CIRCIT DIAGRAM. 4
5. PC BOARD. 11
6. CONNECTOR FUNCTION. 17
7. SEMI-FIXED RESISTORS DIAGRAM ... 18
8. ADJUSTMENT PROCEDURE . 19
9. PARTS LIST.22
KEIO ELECTRONIC LABORATORY CORPORATION
TOKYO/JAPAN

1. SPECIFICATIONS
KEYBOARD.• C~C, 61 Keys, 8 voices
SYNTHESIZER SECTION (*this marked facilities are programmable)
VCO-1*.•Scale (16', 8,4')
• Waveform ( r\ , r\_ , PW. PWM)
• PW/PWM Intensity
• PWM Speed
VCO-2*.• Scale (Off, 16'. 8', 4')
• Waveform ( r\ )
• Detune
VCF* .• Cut-off Frequency
• Resonance
• EG Intensity
• KBD Track (Off, Half. Full)
VCA* .• EG Mode I /'—^~[ )
ENVELOPE GENERATOR.•Attack
• Decay
• Sustain
• Release
VCO-2.• Detune Memory (On/Off)
ENVELOPE GENERATOR.eSolo Release (On/Off)
PROGRAMMER <x16) .• Program Select (1 ~ 8)
• Bank Select (A, B)
• Manual
• Write
• Memory
• Protect (On/Off)
PRESET (x3).•Piano-1
• Piano-2
• Clav
MIXER .•Output (On/Off)
• Volume
BRASS SECTION
SCALE (x2).• 16', 8'
VCF.• Cut-off Frequency
• Resonance
• EG Intensity
ENVELOPE GENERATOR.•Attack
• Decay
• Sustain
• Release
TRIGGER.• Multiple Trigger (On/Off)
• Trigger Select (On/Off)
• Silence Note (2, 4, 6, 8)
MIXER .•Output (On/Off)
• Volume
VOLUME CONTROL .... •Total Volume
• Headphone Volume
POWER SWITCH.•Power (On/Off)
INPUT & OUTPUTS
OUTPUTS.• Mix Outputs x2 (High, Low)
• Separate Outputs x3 (Synthe, Brass, Strings)
• Headphone Output (Stereo)
INPUTS.• Synthe VCF fcM In (-5V ~ +5V)
• Damper ( T_gno )
• Brass VCF fcM In (-5V — +5V)
• Brass Trigger In ( ~i-oun )
• Total Expression (0 ~ +5V)
• Separate Expression x3 (0 ~+5V)
DIMENSIONS.• 1012 (W) x 52 (H) x 524 (D) mm
WEIGHT .*21 kg
ACCESSORIES.•Connection Cord
• Dust Cover
• Foot Switch S-1
POWER CONSUMPTION . . • Voltage (Local Voltage, 50/60Hz)
• Wattage (41W)
STRINGS SECTION
SCALE (x3).•16', 8', 4'
ENVELOPE GENERATOR.• Attack
• Release
EQUALIZER.*High
• Low
EFFECT.• Bowing (On/Off, Level, Tone)
• Vibrato (On/Off, Delay Time, Intensity, Speed)
• Ensemble (On/Off)
FILTER.•KBD Balance
MIXER.• Output (On Off)
• Volume
TOTAL CONTROL SECTION
KEY ASSIGNOR.
KEYBOARD SPLIT.
PITCH CONTROL
VIBRATO.
JOYSTICK
FLANGER
• Assign Mode (1,2)
• Synthe (L, L+H, H)
• Brass (L, L+H, H)
• Strings (L, L+H, H)
• Tune (±100 Cents)
• Delay Vibrato (On/Off)
• Intensity
• Pitch Bend (X-Axis)
• Vibrato Depth/Trill Depth (Y-Axis)
• Intensity
• Speed
• Select (Synthe, Brass, Strings)
• Manual
• Intensity
• Feedback
• Speed
1

2.STRUCTURAL DIAGRAM

3.BL0CK DIAGRAM
3

4.CIRCUIT DIAGRAM
KLM-298 KLM-299 KLM-300

KLM-292

KLM-301 KLM-302

KLM-294 (NEW PRODUCTION)
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FROM
LM291
UK
ic-ts £
4558

KLM-291
KLM-297
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R36 W
VIBRATO
Id 26-2
M.M-294
STj-SlGlHl R3
toM-12 H
KLM -293

5.PC BOARD
KLM-291 FRANGER
KLM-292 PROGRAMER
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; i|i —
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KLM-293 BRASS
KLM-294 STRINGS (OLD PRODUCTION)
-i
H 3 6
ICIO
RI06
RIQ7
D6. „
RI34
O—
RI29
VRI3
RI99 L
CI07 R200
R2I3
;R203
R204
RI95
R205
”187
RI88
RI76
RI90
R209
CI04
R2I7
SW7
A 'ca
U
Yrt
_*
l - 1 -
L
_ 1
R2I6
KLM-294F
12

KLM-294 STRINGS (NEW PRODUCTION)
KLM-343
aaofri 'MC14G46B
8S10W0W
510A
MC14O130
100KB
100KB
TC9130P
KHC
11901 11901
00047
00047
0.0047 0.0047
0.0047
0.0047
KLM'2B4 C
V*
KHC
*1
“1=
11901
13

KLM-300 ASSIGNER
m
myrM
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K 120K
K 2SK30A(GI
KLM-341
(14
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19
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1
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6. CONNECTOR FUNCTION
P.C.B CONNECTOR
FUNCTION CONNECTOR COLOR
P.C.B
CONNECTOR
FUNCTION CONNECTOR COLOR P.C.B CONNECTOR FUNCTION
CONNECTOR
COLOR P.C.B CONNECTOR FUNCTION
CONNECTOR COLOR
KLM-291
01- 1 JOY-INT3
JOYSTICK BR KLM-300
12- 1
TOTAL-ORG 49-2
BR
KLM-301 25- 13
DETUNE
42-3
RE
2 SY-ON/OFF
47-6 YE
2 JOY-INT2 (CCW)
it
RE 2
ST-ORG 35-3
RE 26- 1 TOTAL TUNE
47-1
BR 3
DAMPER
JACK
BR
3
Y
if
OR 3
SY-ORG
41-4 OR
2 DELAY VIB
49-6 OR
4 SY-ORG
12-3 OR
4 X
it
YE 4 BR-ORG 36-3
YE 3
MODULATION
49-5 YE 5
TO PROTECT SW
WH
5 JOY-SPEED 2
i t
GR
5
Z-BRG
36-7 GR
4
MPX CV
11-2 RE
6 FROM PROTECT SW
BK
6
JOY-1 NT 1 (CW)
if
BL
13- 1
GATE 0 15-2
BK 5 D
11-5
GR
42- 1 VC02 16'
25-9 WH
7 JOY-SPEED 3
11
PU
2 RC 0
15-1
91
6 C 11-7
PU 2
- 8' 25-10 BK
8
YOY-SPEED 1 (CW)
19
GY
3
GATE 1 16-2
BR 7
B
11-9 WH 3
DETUNE
25-13 RE
9
+5V
If
WH 4
RC 1 16-1
99
8 A
11-11 PI
4 CUTOFF FREQ
24-1 BR
10 -5V
It
BK
5
GATE 2 17-2
RE
27- 1 ST-SIG 0
40-8 BK
5 RESONANCE
24-3 OR
KLM-294 02- 1 -5V
CATHODE BR
6
RC 2
17-1
9 9
2 BR- "
38-8
• 9
6 RELEASE
24-9 WH
2
GND ANODE
RE 7
GATE 3 18-2 OR
3
SY- -
15-4
99 7
N 25-5 GR
3 GND
PHONE
OR
8 RC 3
18-1
99
28- 1
ST-SIG 1 40-7
BR
8
KBD TRACK 24-5
19
4 PHONE OUT 1
91
YE
14- 1
GATE 4
19-2
YE 2
BR- "
38-7 9
9
9 PRESET
24-10 BK
5 PHONE OUT 2
99
GR
2 RC 4
19-1
99 3
SY- -
16-4
99
10 M.PROTECT
11-1 BR
6
MIX OUT TOTAL VOL BL
3
GATE 5 20-2
GR
29- 1
ST-SIG 2
40-6 RE
43- 1 VCA EG MODE
24-2
RE
7
IN PUT 3
99
PU
4 RC 5
20-1
99
2 BR- ”
38-6 9
9
2
DECAY
24-7 PU
8
" 2
91
GY
5
GATE 6 21-2
BL 3
SY- «
17-4
99
3 EGINT
24-4 YE
9
" 1
9 9
WH
6
RC 6 21-1
99
30- 1 ST-SIG 3
40-5 OR
4
ATTACK
24-6 BL
KLM-291
03- 1
GND
MIXER VOL
—
7
GATE 7 22-2
PU
2 BR- "
38-5 9
9
5 AUSTAIN
24-8 GY
2 SY-SIG-OUT
91
BR
8
RC 7
1
99
3
SY- -
18-4
9 9
6 PW/PWM
25-1 BR
3
GND
9 t —
KLM-302 15- 1
13-2
BK
31- 1
ST-SIG 4 40-4 YE
7 VCO 1 16'
25-11 PI
4
BR-SIG-OUT
19
RE
2
GATE 0 13-1
9 9
2
BR- "
384
99
8 » 8'
25-12 LB
5
GND
99
—
3
SY-CV 0 08-1
9 9
KLM-301
31- 3 SY-SIG 4 194
YE 9V
VC02 OFF 25-4
YE
6 ST-SIG-OUT
9 9
4
SY-SIG0
27-3
99
32- 1 ST-SIG 5
40-3
GR
10 PRESET VOLUME
24-11
PI
KLM-300 04- 1 XO KLM-298
BK
5
SIG MIX 0 23-1
99
2 BR- "
38-3
99
44- 1
PRESET-CLAV
45-1 BR
2
XI
9 9
BR
16- 1
RC-1
13-4 BR 3
SY- -
204
99
2 " -PIANO 2
45-2
RE
3 X2
It
RE
2
GATE 1 13-3
99
33- 1 ST-SIG 6
40-2 BL
3
- -PIANO 1 45-3 OR
4
X3
99
OR
3
SY-CV 1 08-2
99 2
BR- "
38-2
9 9
4
- -DATA 45-4
YE
5 X4
9 9
YE 4 SY-SIG1 28-3
9 9 3
SY- -
214
9 9
5
- -INH2 45-5 GR
6
99
GR _ 5 SIG-MIX 1
23-2
9 9
34- 1
ST-SIG 7
40-1 PU
6 - -INH 1
45-6 BL
KLM-300 05- 1 M0
KEYBOARD
BK
17-
1
RC-2
13-6
RE
2 BR- -
38-1
9 9 7
- -C 45-7 PU
2
Ml
9 9
BR
2 GATE 2
13-5
9 9
3
SY- -
224
9 9
8
/• -B
45-8
GY
3 M2
99
RE
3
SY-CV 2 08-3
RE
KLM-294
35- 1
ST-RELEASE 374
BR 9 " -A
45-9
WH
4 M3
• 9
OR 4 SY-SIG2 29-3
99
2 - -ATTACK
37-5 OR
10 - +5V
45-10 BK
5
M4
99
YE
5
SIG MIX 2 23-3
9 9
3 " -ORG
12-2 RE
11
" -5
45-11 PI
6 M5
99
GR
18- 1 RC-3
13-8
OR
4 " -4'
25-2
9 9
KLM-317
45- 1 PRESET-CLAV 44-1
BR
7
M6
99
BL
2
GATE 3
13-7
9 9
5 - -8'
25-8
GY 2
" -PIANO 2 44-2 RE
8 M7
99
PU
3
SY-CV 3
08-4
99
6
" -16'
25-7
PU 3
” -PIANO 1
44-3 OR
9 M8
99
GY 4
SY-SIG3 30-3
9 9 7
" -ON/OFF
46-1 YE 4 - -DATA
44-4 YE
10 M9
99
WH
5
SIG MIX 3
23-4
99
8 T.S.-SW
36-12 GR 5
" -INH 2
44-5 GR
11 M10
9 9
_ BK
19- 1
RC 4
14-2
YE
9
" -ON/OFF
36-6 BL 6 - -INH 1
44^ BL
KLM-293 06- 1
ST-SIG-7 KLM-317 PU
2
GATE 4
14-1
99
10 ST-SIG IN (-*293) 37-1
OR 7
- -C 44-7
PU
2 " 6
99
BL 3
SY-CV 4 08-5
99 11
GND — —
8
- -B
44-8 GY
3
•• 5
99
GR 4 SY-SIG 4 31-3
99
12
ST-SIG OUT (-291)
46-2 OR 9 " -A
44-9 WH
4 " 4
99
YE
5
SIG MIX 4 23-5
99
KLM-293 36- 1 ■ -i i ■
H;l«l
10 " -+5V
44-10
BK
5
" 3
99
OR
20- 1
RC 5
14-4 GR
2
GND
mmm 11
” - -5V
44-11
PI
6 " 2
19
RE
2
GATE 5 14-3
99 3
BR-ORG 124
YE
KLM-291
46- 1 ST-ON/OFF
35-7 YE
7
" 1
99
BR
3
SY-CV 5 08-6
99
4
BR-TRIG IN JACK OR
2 ST-SIG IN«-294
35-12 OR
_ $
" o
99
BK _
4 SY-SIG 5 32-3
99
5 NC
3 BR-ON/OFF
36-11 PU
KLM-294 07- 1 -15
9 9
BL
5
SIG-MIX 5 23-6
99
6
T.S.-ON/OFF
35-9 BL
4 BR-SIG IN-293
36-1 RE
2
GND
99
BK
21- 1 RC-6
14-6
BL
7
£BRG 12-5 GR
47- 1
TOTAL TUNE
26-1 BR
3 + 15
99
RE
2 GATE 6
14-5
99
8
BR-TRIG OUT
JACK
YE 2
SY-EXPRESSION
JACK
BL
4 ST-CUTOFF FREQ
99
BR
3 SY-SV6
08-7
99
9 BR-16 25-3 OR 3
ST- -
JACK GY
KLM-300 08- 1 SY CV-0 15-3 BK
4 SY-SIG 6 33-3
9 9
10 BR-8 25-6 BL
4
BR- "
JACK PU
2 " CV-1 16-3 BR
5 SIG-MIX 6
23-7
99
11
BR-ON/OFF
46-3 PU 5
SY-SIG IN
24-13 BR
3 " CV-2
17-3
RE
22- 1
RC 7 14-8
PU
12 T.S.-SW
35-8 GR
6 SY-ON/OFF
41-2 YE
4 " CV-3 18-3 OR
2
GATE 7 14-7
9 9
37- 1
ST-SIG OUT (-*294)
35-10
OR
48- 1 ST- >
10-3 OR
5 " CV-4
19-3
YE
3
SY-CV 7 08-8
99
2 GND
2
- ◄ 0
10-2 RE
6 " CV-5
20-3
GR
4 SY-SIG 7 34-3
99
3 BR-EXT fcM
JACK
GR
3 " ◄
10-1
BR
7
" CV-6 21-3 BL
5
SIG MIX 7 23-8
9 9
4
ST-RELEASE
35-1 BR
4 BR 0
10-6 BL
8 " CV-7
22-3
PU
23-
1
SIG MIX 0 15-5
BK
5 ST-ATTACK
35-2
OR
5
" ◄ > 10-5 GR
09- 1 ST CV-0 39-1 BK
2 " 1
16-5 BR
6
D
11-6 BL
6
" ◄ 10-4
YE
2 " CV-1
39-2
BR
3
" 2 17-5
RE
1
c
11-8
GY 7
SY t>
10-9 WH
3 " CV-2 39-3 RE
4
" 3
18-5 OR
8
B
11-10
VJ 1
BK
8
" ◄ >
10-8
GY
4
" CV-3
39-4 OR
5
- 4 19-5
YE
9
A
1 R
9 - ◄
10-7
PU
5 ” CV^I 39-5 YE
6
" 5 20-5
GR
10 BR-MPXG
BK
10 ASSING MODE
11-4
YE
6 " CV-5 39-6
GR
7 " 6
21-5
BL
11
MPX GATE
11-3 OR
49- 1
VIB INT 2
VR-GND
BK
7
" CV-6
39-7 BL
8 " 7
22-5
PU
12 ST-MPXG
10-11 PI
2
TOTAL-ORG
12-1 BR
8
" CV-7
39-8 PU
24-
1
CUT OFF FREQ 42-4
BR
38- 1
BR-SIG 7
34-2 PU
3 VIB INT 1
VR-CW RE
10- 1 ST- A
48-3
BR
2
VCA EG MODE 43-1
RE
2
99 m 99 ft
33-2
1
R 1
4 VIB INT 3
VR-CNT BR
2
ST- A>
48-2 RE
3 RESO NANCE
42-5 OR 3
•• - "5
smsj 4
32-2
D L
GR
5
MODULATION
26-3 YE
3 ST- >
48-1
OR
4
EG INTENSITY
43-3
a a n
YE
4
99 m "4
31-2 YE
6
DELAY VIBRATO
26-2 OR
4 BR- a 48-6 YE
5
KBD TRACK 42-8 CjR 5
•f . 99 ^
30-2
OR
5
BR- ◄ D> 48-5 GR
6
ATTACK
43-4 BL
6
99 - 99 O
29-2
v n
RF
6 BR- l> 48-4 BL 7 DECAY 43-5
GY
7
Am
99 m 99 1
Amrn/ A
28-2
n
RR
7 SY- A
48-9 PU
8 SUSTAIN
43-5
GY
8
■
•• - "0
27-2
o n
BK
COLOER
DD- RROlAr
M
SY- A t>
48-8 GY
9
RELEASE 42-6
WH
KLM-317 39- 1 ST-CV 0
09-1
9 9
Dn— Dnuvv IN
9
SY- O 48-7 WH
10 PRESET 42-9
BK
2
99 99 1
09-2
RR
RE= RED
10 BR-MPXG
37-10
BK 11
PRESET VOLUME 43-10
PI
3
•
99 99 O
09-3 RF
UR= ORANGE
11 ST-MPXG 37-12 PI
12 GND
—
—
4
fc
99 99 7
Vv V
09-4
n u
OR
YE= YELLOW
11- 1 M.PROTECT 42-10 BR
13
SY-SIG OUT (— ► 291) 47-5
BR
5
mm
9 9 99 A
-*r
09-5 YF
GR= GREEN
2
MPX-CV
26-4
RE
KLM-301 25-
1
PW/PWM 43-6
9 9
6
■
99 99 5
vw/ yj
09-fi
* u
OR
BL=BLUE
3 MPX-GATE 37-11 OR
2 ST-4'
35-4 RE
7
9 9 9 9 p
v
09-7
vj n
D 1
PU= PURPLE
4 ASSIGN MODE
48-10
YE
3 BR-16'
36-9
OR
•
8
u
99 99
Vil7*/
09-8
D L
P| 1
GY= GRAY
5 D 26-5 GR
4 VC02 OFF 43-9
YE
40- 1 ST-SIG 7
34-1
■ U
99
WH=WH ITE
6 D
37-6
BL
5
42-7 GR 2
99 99 K
33-1
R I
BK=BLACK
7
C 26-6 PU
6 BR-8'
36-10 BL
mm
3
v
99 5
O sj 1
32-1
D L
OR
Pl= PINK
8 C 37-7
GY 7
ST-16'
35-6
PU
4
99 99 4
31-1
vj n
YF
LB= LIGHT BLUE
9
B 26-7 WH 8
ST-8'
35-5
GY
5
99 99 3
O 1 1
30-1
I L_
OR
10 B 37-8 BK
9
VC02 16' 42-1
WH
6
99 99 O
\m mm 1
29-1
v n
R F
11 A
26-8
PI
10 VC02 8'
42-2
BK 7
Am
99 9 9 I
4v 1
28-1
n l.
RR
FUNCTION
12
A
37-9 LB 11
VC01 16'
43-7
A A
PI
i f“>
8
■
•• •• 0
27-1
on
BK
SY= SYNTHE
12 VC01 8 43-8
LB
KLM-292
41- 1
SY-EXT fcM
JACK RE
on- d nasi
1_1 _
o 1 = STRINGS
17

7.SEMI-FIXED RESISTORS DIAGRAM
VR4
VR1
i
VR2
KLM-292
VR3
VR16 ~ VR30
VR6
'VR7
»VR5
»VR4
’VR3
»VR2
VR1
I
i
I
I
I
I
0
//
//
// //
//
KLM-302
KLM-300
VR12
VR11
VR9
VR8
VR10
•
VR8
•
VR6
•
VR7
•
VR1
•
VR5
•
VR4
•
^ VR2
VR3
1
KLM-293
KLM-294
18

8.ADJUSTMENT PROCEDURE
Note: This instrument has been precisely adjusted at the factory. Therefore, do not change the position of any variable
resistors other than those necessary for servicing.
1. Power supply (KLM-297)
(1) Use a digital multi-meter to check power supply
leads (possible on any of the circuit boards) which
should measure ±15V (±14.7 — ±15.8V) and ±5V
(±4.7V — ±5.3V).
(2) Check KLM-301 +5V (above ground) directly with a
digital multi-meter and adjust VR-1 to obtain
5.000V (±0.001V).
(3) Also ascertain that the -5V supply is -4.995 —
-5.005V.
2. Key assigner (KLM-300)
(1) Assign mode: Switch away from test position, then
reset before proceeding.
1) At assign mode 1, play one key at a time and
ascertain that the LEDs light up in the order:
Di~D 8 .
2) At assign mode 2, play two or more keys at once,
then release them and ascertain that the LEDs
light up beginning from the position of the last
key released.
(2) KBD SPLIT: Check each section (synthe, brass,
strings) as follows.
1) KBD SPLIT at < t>— all 61 keys sound.
2) KBD SPLIT at ◄ — only lower two octaves
sound.
3) KBD SPLIT at >-only upper three octaves
sound.
4) Check to see that there is a clear and accurate
split between C3 and B2 for all 8 units. If not,
adjust VR-1 as necessary.
3. Programmer (KLM-292)
(1) With EG INT (EG INTENSITY) at 0, adjust VR-1
so that EG INT CV (302-24-4 or 29243-3) is
0.00V (±60mV).
(2) With EG INT at -5, adjust VR-2 so that the EG
INT CV is +5.00V (±60mV).
(3) With EG INT at +5, ascertain that EG INT CV
is -5.00V (±60mV).
(4) Adjust V R-3 if these tolerances cannot be met.
(5) Reset EG INT to standard 0 setting after adjust¬
ment.
(6) PW/PWM CV adjustment
Set VCO 1 scale to 16', waveform to PW, and PW/
PWM to 10. Use a digital multi-meter to ascertain
that PW/PWM CV (301-25-1 or 292-43-6) is 2.9V
(±50mV). Adjust VR-4 if necessary.
4. Synthesizer (K LM-302)
(1) Offset check and adjustment
1) Set VCO waveform to r\, set cutoff frequency
to 0 (and set other controls to standard settings).
Check SY-SIG OUT (302-24-13) with oscillo¬
scope (0.1 sec/cm, 50mV/cm).
2) Play any single key and ascertain that the DC
output pulse is within ±50mV for units 0—7.
3) If tolerances are not met, set assign mode to 2,
and adjust VR-1 for the unit in question.
4) After finishing, return assign mode to 1 and cut¬
off frequency to 10.
(2) VCA check and adjustment
1) Set VCO 1 waveform to r\and check SY-SIG
OUT (302-24-13) with an oscilloscope (1 msec/
cm, 0.65V/cm).
2) Play key C3 and ascertain that sawtooth wave¬
form amplitude is 0.65Vp-p (±0.05V) for units
0-7.
3) If tolerances are not met, adjust VR-4 for the
unit in question.
4) After finishing, set waveform to PW.
(3) Resonance adjustment
1) Set PW/PWM to 10, cutoff freq to 5, and reso¬
nance to 8. Measure cutoff freq CV (302-24-1)
with a digital multi-meter and adjust cutoff freq
and cutoff freq fine to obtain OmV (±10mV).
2) Measure resonance CV (302-24-3) with the multi¬
meter and adjust resonance to obtain 8.00V
(±80mV).
3) Measure SY-SIG OUT (302-24-13) with an
oscilloscope (1 msec/cm, 0.15V/cm).
Play any single key and ascertain that the VCF
waveform amplitude (sine wave) is 0.15Vp-p
(±10mV).
4) If tolerances are not met, adjust VR-3 for the
unit in question.
(4) Cutoff frequency adjustment
1) Set resonance to 10, PW/PWM to 10, and cutoff
freq to about 6.3 (ascertaining that this gives
OmV ±10mV). Measure SY-SIG OUT (302-24-
13) with an oscilloscope (1 msec/cm, O.IV/cm)
and a frequency counter.
2) Play any single key and adjust VR-2 so that the
filter oscillation frequency (measured with
WT-12) is C=523Hz for units 0-7.
3) Adjust cutoff freq and cutoff freq fine to obtain
3.00V (±10mV) for the cutoff freq CV (302-
24-1).
4) Play any single key and adjust VR-7 for units 0—
7 to obtain C=4186Hz for the filter oscillation
frequency.
5) With cutoff freq CV (302-24-1) at OmV (±10mV),
adjust cutoff freq fine to obtain C=523Hz for
the oscillation frequency of unit 0.
6) Repeat steps 2 through 5 as many times as neces¬
sary to reduce deviation to within ±5 cents.
(5) KBD TRACK adjustment
1) Set KBD TRACK to FULL, PW/PWM to 10,
cutoff freq to about 6.3, and resonance to 10.
2) Play G3 and adjust cutoff freq fine to obtain
C=523Hz (measured with WT-12) for the oscilla¬
tion frequency of unit 0.
3) Adjust VR-2 for units 1—7 so that each unit's
oscillation frequency is C=523Hz, under the
same conditions as above.
4) Play G4 and adjust VR-5 for units 0—7 so that
each unit's oscillation frequency is C=1109Hz.
5) Repeat steps 3 and 4 as many times as necessary
to reduce deviation to within ±5 cents.
6) Check from Cl through C6 by ear to make sure
it sounds approximately like a scale. (No need to
use WT-12.)
7) Set KBD TRACK to HALF and check to see
that it changes to a 1/4 scale.
8) After finishing, switch KBD TRACK to OFF.
(6) EG INTENSITY check and adjustment
1) Set cutoff frequency to 0, EG intensity to +5,
PW/PWM to 10, and resonance to 10. Check
SY-SIG OUT with an oscilloscope (20psec/cm,
O.IV/cm) and a frequency counter.
2) Play any single key and ascertain that the oscilla¬
tion frequency for units 0—7 is 5.5kHz—6.0kHz.
If not within these tolerances, adjust VR-6.
3) After finishing, set EG INT to 0, cutoff freq to
10, PW/PWM to 5, and resonance to 0.
(7) EG check and adjustment
1) Set attack to 10 and sustain to 0. Play any eight
keys simultaneously and ascertain that the attack
time is 20—25 seconds. If not within these
tolerances, use a digital multi-meter to measure
the potential difference between the +5V power
supply and the attack common line (the chart
pattern closest to the keyboard side). Adjust
VR-8 in accordance with the chart in figure 1.
2) Set attack to 0, decay to 10, and sustain to 0.
Play any single key and ascertain that the decay
time is 20—30 seconds. If not within these toler¬
ances, use a digital multi-meter to check the
potential difference between the +5V power
supply and the decay common line (the chart
pattern after attack). Adjust VR-9 in accordance
with the chart in figure 1.
3) With attack at 0 and decay at 0, turn sustain
from 0 to 10 and check to see that there is a
smooth change in sustain level for units 0—7.
4) Set attack to 0, decay to 0, and sustain to 0.
With release time at about 5 seconds, there
should be no greater than about 1 second error
between units.
5) After finishing, return release to 0 to return to
the standard setting.
(8) Presets
1) Play keyboard, using piano 1,2, and clav.
2) Based on the data on the following page, check
and adjust test points on the page after next.
Adjust circled points only; others should only be
checked. Adjustment voltages are valid up to
two places.
Figure 1. Attack and decay voltage values vs. temperature.
Temperature
Tolerance: Within ±1mV of value on graph.
( V J
Test
point
PIANO 1
PIANO 2
CLAV
1 VC02.SCALE
+ 1.25 4’
+5 OFF
+5 OFF
2
VCOI.
WAVE FORM
-1.25 PW
-1.25 PW
-1.25 PW
3
^VCOI.SCALE
0 8'
-5 16'
-5 16'
©
PRESET VOL
+2 4
+2 4
-2 2
JD
PW/PWM
-5
-3.95
(+2.6V)
6
KBD TRACK
‘+5 HALF
-5 FULL
0 OFF
7
LFO SPEED
-10 (LOW SPEED)
(D
DETUNE
0
0
0
@
SUSTAIN
-5
-5
-4.3
© RESONANCE
+5
+3.07
+5
©
CUTOFF FREQ
+2.74
+ 1.94
+3.86
©
RELEASE
+0.64
+0.18
-5
DECAY
* 1
-5
-5
©
EG INT
+0.65
-0.66
-0.8
ATTACK
+3.2
+5
+5
16
EG MODE
+5 -A“\-
O: Need adjustment.
Others require check only.
19
KLM-292