Roland SH-3A Operating and maintenance manual

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ELECTRONIC MUSICAL INSTRUMENT
ROLAND SYNTHESIZER
SH-3A
}•'■ - A
THE 5th EDITION
Printed in Japan. '76.Apr.
APPLIED FROM SERIAL No.270800

CONTENTS
1. SPECIFICATIONS 2
2. GENERAL CIRCUIT DIAGRAM 4
3. CONTROL CIRCUIT 5
3-1. CONTROL CIRCUIT BLOCK DIAGRAM 5
3-2. FILTER BOARD ASSEMBLY (FL-5) 6
3-3. PACK No.7B ASSEMBLY 7
4. VCO CIRCUIT 8
4-1. VCO PULSE BOARD ASSEMBLY (OP-9A) 8
4-2. PACK No,8 ASSEMBLY 12
4-3. PACK No.4 ASSEMBLY 12
5. VCF-VCA CIRCUIT 13
5-1. VCF-VCA BOARD ASSEMBLY (OP-1OB) 13
6. POWER SUPPLY CIRCUIT 17
6-1. POWER SUPPLY BOARD ASSEMBLY (PS-12C) 17
7. ADJUSTMENT 18
7-1. PREPARATION 18
7-2. VCO TUNING 18
7-3. VCA ADJUSTMENT 18
7-4. CLICK BIAS ADJUSTMENT 18
7-5. RESONANCE ADJUSTMENT 19
7-6. ADSR ZERO ADJUSTMENT 19
7-7. VCF OCTAVE ADJUSTMENT 19
7-8. CHORUS ADJUSTMENT 19
7-9. NOISE ADJUSTMENT 20
8. PARTS LIST 21

ELECTRONIC MUSIC SYNTHESIZER MODEL SH - 3A
ROLAND SYNTHESIZER
1. SPECIFICATIONS
* 44Keys(F Scale)
Note can be raised or lowered by one octave via Transpose switch.
* VCO Assembly(Voltage Controlled Oscillator).
5 Octave Combination(32», 16', 81, 4f, 2«) 5
Waveform Selector •••• •• ••••• 5
Modulation Waveform Selector (N\/njAv ) 3
Modulation Depth Control (VIBRATO) 1
Pitch Control 1
Glide Switch 1
Portamento Time (PORTAMENTO) 1
Portamento OFF Switch (OFF) 1
Transpose Changeover Switch ( L/M/H ) 1
8f Chorus Speed Control/OFF (81 CHORUS) 1
Sampler
Sampled Waveform Selector (MODE - OFF//WIm/a/s/RANDOM) 1
Sampling Time (SAMPLE TIME) 1
Sampling Level Control (LEVEL) 1
* VCF Assembly (Voltage Controlled Filter)
Filter Resonance Control
CUTOFF FREQ 1
RESONANCE 1
Modulation Waveform Selector ( Ns/fLJ If\j ) •••• ••• 1
Modulation Depth Control (GROWL) 1
Envelope Selector (ADSR//1 /a_ ) • 1
Envelope Sensitibity Control (SENS) 1
* VCA Assembly (Voltage Controlled Amplifier)
Modulation Waveform Selector (N\/rLl/rVy ) l
Modulation Depth Control (TREMOLO) 1
Envelope Selector (ADSR/./T /A. / J~"L ) 1
Hold Control 1
OUTPUT Level Control (OUT LEVEL) 1
* Others
Envelope Control 4
Attack Time/Decay Time/Sustain Level/Release Time
Low Frequency Oscillator 1 Rate •••••••••• 1
Low Frequency Oscillator 2 Rate • • • 3
Low Frequency Oscillator 2 Delay Time Control 1
Noise Cenerator Level Control 1
White/Pink Noise Changer 1
Noise Input Selector • ]
Phones Level Control !)
Tuning ( on rear Panel) ]
OUTPUT Jack 1
OUTPUT VOLTAGE CHANGEOVER SWITCH (L/M/H) ]
PHONES Jack 1
Jack for VCO CONTROL 1
Jack for VCF CONTROL 1
- 2 -

Voltage Changer (for changing AC voltage)
* Power Source
* Power Consumption
Dimensions
* Weight(Net)
* Accessories
Accessories(optional)
+-* *•♦*+
9 25OV 5O/6OHZ
W ; 1005mm (40.2")
D 5 320mm (12.8")
H ; 150mm ( 6.0")
14.5 Kg (32 Lbs.)
Music Rack
Conection Cord
(2.5m with Pin-Plug Adaptor)
Volume Control Pedal FV-1
(for controlling Sound Volume, VCO
GLIDE effect or VCF CUTOFP'-
PREQUENCY)
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Note :
Specifications changed from 3H-3
VCF-VCA BOABD A33E?.'3LY
Some Potentiometers
ADJUSTMENT

2.
GENERAL
CIRCUIT BLOCK
DIAGRAM
,

3.
CONTROL CIRCUIT
3-1.
Control
Circuit
Block
Diagram
VCO
FULSE BOARD
Of~tO
VCP-VCA
BOAPJ)
-
5
-

3-2 FILTER BOARD ASSEMBLY (FL-5) (Serial mimber XX254 9 and below)
A.Parts Layout
EVA-QOAAOOA14
MR. /OKA
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/0kA
m/\
- 6 -

3-2. FILTER HOARD ASSEMBLY (FL-5) (Serial number XX2550 and above)
A. Parts Layout
Tr :
/>. US 2473
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EVA-QOAAO0A/4
-6 1-

3-2. KILTER BOARD ASSEMBLY (FL5) (Serial number XX2550 and above)
A.Parts Layout
-6-2-

3-3. PACK Na7fi ASSEMBLY (Serial Nwniter XX2549 ami below )
A. I'ar I s Layout
5s
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B. Circuit Diagram (Pack No.7B)
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4. VCO CIRCUIT
4-1. VCO PULSE HOARD ASSEMBLY (OP-9A) (Serial Number XX2399 ami below)
A. Part 8 Lavout
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P'"l» Capacitor
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ft mm O E/ectro|y<lc Capacftor
- 6 -

4. VCO CIIU.TIT
4-1 VCO ITL2SK BOARD ASSEMBLY (Serial Numbers XX2400-XX2549 inrhmiw)
A. I'air I s I.avuii t
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4
mlE BOABD «S«BLY(OMU)
A.Parts Layout
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B. Circuit Diagram (0P-9A)
(Serial Number XX2399 and below)
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NOTE i UNLESS OTHERWISE SPECIFIED
ALL NFN TRANSISTORS 2SC945
ALL PHP TRANSISTORS 2SA733
ALL DIODES IS2473
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pun OOPZXX
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C. Hear tiiiJr purls layuiil (l)l' 9A)
(Serial Number XX25-I9 iirul hrl
120X240
O52-99OA

4-2. PACK No.8 ASSEMBLY
A. Parts Layout
C. Circuit Diagram (PACK No.8)
1 2 3
B. Rear oido (PACK No.8)
D i 1S2473
4-3. PACK No.4 ASSEMBLY
A* Parts Layout
B. Cirouit Diagram (PACK No.4)
/ 2
t> 7
S i 132473
- 12 -

purls liiyi
P-!On) (Seri
(Serial Number XX2549 im.Ibrl.iw)
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- 14 -

5. VCFVCA CimTIT
5 1. VCF \('.\ IJUAIII) ASSEMBLY(OP-10H) (Serial NhiiiIht XX2 55 0-.VX3049 in.-lnsivp)
A . Parts Layout
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-14 1