Download - Korg VC-10 Service Notes
SERVICE MANUALVC-10CONTENTS . .
1. SPECIFICATIONS 2
2. STRUCTURAL DIAGRAM 3
3. CIRCUIT DIAGRAMKLM-136 4
KLM-135 5
KLM-134 6
4. PC BOARDKLM-136 7
KLM-135 8
KLM-134 9
5. BLOCK DIAGRAM 10
6. PARTS LIST (Mechanical parts not listed) 1
1
7. CHECK AND ADJUSTMENT 12
KEIO ELECTRONIC LABORATORY CORPORATIONTOKYO/JAPAN
1. SPECIFICATIONS
< Controls >1. Keyboard 32 keys F ~C
Octave range: normal 16'
up 8'
Tuning ±100 cents
Accent bend
Vibrato speed (1 Hz ~ 10 Hz)
Vibrato depth (0 ~ 100 cent P-P)
External pitch control
Pitch control wheel (±Vi octave)
2. Signal mixers Input signal balance (keyboard/
noise)
External signal level
3. Frequency response Microphone level
simulator
4. Meter VU meter
5. Final controls Ensemble
Power switch/final volume
Output balance (simulator/mike)
Headphone level
< Inputs >1. Mike inputs
2. Signal inputs
< Outputs >1. Final
2. Headphone
Power consumption
Dimensions
Weight
BTS connector input ) __
2P phone jack input
Signal input 3V p-p MAXPitch control input ( 1 /3-oct/vol
-3V-3V
Final out -10dB (output imp
ance 3KQ)
Headphone out 812 1 20mW25W499(W) x 309(D) x 249(H) mm7kg
I. STRUCTURAL DIAGRAM
Front panelRotary knob
Side pane! (left)
Control wheel holder
Rubber feet #5Main chassis
small)
Rotary knob
P (large)
/
3PBTS Connector
3. CIRCUIT DIAGRAM KLM-136
(LEVEL EXPANDER)
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KLM-134
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CHANNEL 2C502-IO))/l6V C602-1>i/50V
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CHANNEL 3
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4
C504-ICv/l6V 0604 - l)i/50V
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CHANNEL
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1 CHANNEL 13 .
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JCHANNEL 16
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\ CHANNEL 17
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RI4 I0OQVW O ACCENT OUT
O +I5V
O GND
O -I5V
KLM-135
A*3 A3 G*3 G3
sotor
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KORG VC-10
KLM-I35B
4. PC BOARD KLM-136
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5. BLOCK DIAGRAM
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6. PARTS LIST(Mechanical parts not listed)
•CARBON RESISTORSnot listed
•METAL FILM RESISTORS1/4W1%100Q x 1
1/4W1%1kft x 40
1/4W1%1.21K% x 40
1/4W1%4.03KQ x 1
1/4W1%5.1Kfl x 1
1/4W1%10KO x 1
1/4W1%16.9KQ x - 1
1/4W1%29.4KQ x 11
1/4W1%100KQ x 3
1/4W1%162Kfi x 1
1/4W1%200KQ x 40
1/4W1%243KH x 40
1/4W1%301KQx 1
1/4W1%402KG x 2
1/4W1%619Kfi x 32
1W1%330Q x 32
•MYLAR CAPACITORS50V- 0.00
1
MF x 4
50V - 0.0022MF x 1
50V-0.01 MF x 1
50V - 0.022MF x 6
,50V - 0.27MF x 4
50V - 0.33MF x 4
50V-0.39MF x 1
50V - 0.47MF x 3
50V - 0.56MF x 1
50V - 0.68MF x 1
50V-0.082MF x 1
•CERAMIC CAPACITORS50V - 22pF x 1
50V-47pF x 1
50V-100pFx 6
50V-120pFx 1
50V-t50pFx 1
50V-180pFx 5
50V - 220pF x 7
50V - 270pF x 1
50V-330pFx 3
50V - 390pf x 4
50V-470pF x 7
50V-680pFx 2
•TANTALUM CAPACITORS16V2.2MFx 2
•ELECTROLYTIC CAPACITORS1.6V - IQmF x 64
16V-100MF x 8
50V-1.0mF x 29
25V -2200MF x 2
•POLYPROPYLENE •SEMI-FIXED RESISTORS
CAPACITORS SR29R4.7KflBx 2
100V- 0.001 VF x 1 SR19R100KQB x 33
100V - 0.001
2
MF x 8 SR19R100KQB x 1
100V-0.0015/zF x 9 SR19R47K12B x 1
100V-0.0018MF x 8 SR19R220KQB x 2
100V-0.0022MF'x 8
100V-0.0027MF x 8 •ROTARY VARIABLE RESISTORS
100V-0.0030MF x 2 EVH-5LA802B15 x 4
100V-0.0033mF x 9 EVH-5LA802B14 x 1
100V-0.0036mF x 2 EVH-5LA802A15 x 2
100V-0.0039juF x 9 EVH-5LA802B16 x 1
100V-0.0043MF x 2 EVC-BQ5P18B14 x 1
100V-0.0047MF x 9 EVH-OFA-803B14 x 1
100V - 0.005 1 juF x 2 EVH-OFA-803B15 x 1
100V-0.0056MF x 10 EVH-RTAP20B15 x 1
100V-0.0062MF x 1 (Center click-stop)
100V-0.0068MF x 10
100V-0.0075MF x 1 •SLIDE SWITCH
100V-0.0082,xF x 10 SSB- 12208 x 3
100V- 0.009
1
MF x 1.
100V-0.000VF x 11 •KEY
100V- 0.001 ImF x 1 F-c 32 key
100V - 0.01
2
MF x 9
100V-0.013mF x 3 •PHONE JACK100V- 0.01
5
MF x 9 2P (RC-707) x 3
100V-0.016MF x 2 3P (ST) x 1
100V-0.018MF x 9
100V-0.022MF x 8 •FUSE100V-0.027MF x 8 250V-0.1A x 1
100V-0.033MF x 8
10GV-0.039mF x 8 •CONNECTORS100V-0.047MF x 8 ^ BE4P-SHF-1 x 1
100V-0.33^F x 1 BE8P-SHF-1 x 1
LBE11P-SHF-1 X 1
•TRANSISTORS /}-BS9P-SHF-1 x 1
^BS^P-SHF-I x 22SA-798G x 1
2SA-564AS x 32 BS10P-SHF-1 x 1
2SC-1685S x 5 _ BS4P-SHF-1 x 1
(special selected) Female Connectors
2SA-733K x 35 MLR-3RRC-1 x 1
2SC-945LK x 55 4PVC-1001 x 1
2SC-644R x 1 4PVC-1002 x 1
8PVC-1003 x 1
•DIODES 9P x 1
1S-1555 x 85 10P x 1
1S-1885 x 4 11P x 1
12P x 1
•IC MLP-03TRC-220 x 1
N13T-1 x 32
MN-3004 x 2
MPC-4558 x 87
,iPC-14315 x 1
mA-7915 x 1
MC-14069 x 2
NE-570 x 1
7. CHECK AND ADJUSTMENT
(refer to figures 1 and 2)
Setup for testing.
a. Connect VC-10 FINAL OUT to WT-10 (Korg
Tuning Standard) input jack.
b. Connect microphone (audio signal) to VC-10MIC INPUT.
7-1 TOTAL PITCH Adjustment.
a. Set TUNE knob to center.
b. Set OCTAVE switch to down position.
c. Play A-2 (on keyboard) and adjust VR1 so that the
WT-10A indicates the correct pitch.
d. Adjust each of the trimmer screws from F-1 to C-3
to the correct pitch as indicated on the WT-10 Ameter.
7-2 OCT UP PITCH Adjustment.
a. Set OCTAVE switch to UP position.
b. Play F-3 (on keyboard) and adjust trimmer screw
VR-2 as necessary, so that the pitch is one octave
higher than before.
7-3 SLOPE ADJUST Adjustment.
a. Play F-1 and adjust VR-3 so that the pitch is one
octave higher than before.
(Repeat adjustments 7-2 and 7-3 as many times as
needed, so that all keys stay in tune at both OCTAVEswitch positions.)
7-4 BIAS Adjustment.
a. Disconnect microphone from MIC INPUT.
b. Disconnect WT-10A, and connect FINAL OUT to
amplifier.
c. Play each of the keys on the keyboard and adjust
VR-4 just as much as necessary so that no sound
will be produced. Do not turn VR-4 further (clock-
wise) than the point where the sound first stops. If
turned too far, sensitivity to a microphone input
signal will be too low.
0.TUNE
SB"OCTAVE
at-
B Q
G1
O QCg CV OJ
B2
POWER FIN VOL
D3
O
FINAL OUT
O
OO
o <2 °9 * *u- O <
G3 83
•TO SOUND
-TO KORG Tuning Standard WT-10A
Fig.1
PICH ADJUST
B3 *
A3 G3 F3 D#3 C*3 82 A2 G2 F2 D#2 C«2 B1 At Gl
oo A#3 G#3 F#3 E3 D3 C2 a#2 G#2 F#2 E2 02 CI A#
CIRCUIT BOARD KLM- 135
Fig. 2
L«$O
VR3 SLOPE ADJ QVRl TOTAL PITCH QVR2 OCT UP PITCH
VR4 BIAS
Circuit Board KLM- 134
Oo