Roland SH-5 Operating and maintenance manual

WPW.

MANUAL

MANOR

SH-5

Service

Notes

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CONTENTS

1.

SPECIFICATIONS

3

2.

FRONT

PANEL

4

3.

ASSEMBLY

DESCRIPTION

5

3-1

Keyboard

Unit

Assembly

K3-1

5

3-2

Control

Unit

Assembly

CU-1

5

3-3

Sub

Chassis

Unit

Assembly

SU-1

7

3-4

Power

Supply

Unit

Assembly

PC-5

7

4.

GENERAL

CAUTIONS

8

5.

GENERAL

BLOCK

DIAGRAM

,

9

6.

CABINET

DISASSEMBLY

10

7.

WIRING

BLOCK

DIAGRAM

11

8.

KEYBOARD

UNIT

ASSEMBLY

KB-1

11

,

8-1

Keyboard Assembly

SK-142B

11

8-2

Bender

Assembly

PB-1

11

8-3

Control Unit

Assembly

CU-2

12

8-4

Manual

Board

Assembly

OP-25

12

1

8-5

Circuit

Diagram

KB-1

13

9.

CONTROL

UNIT

ASSEMBLY

CU-1

14

9-1

Circuit

Diagram

CU-1

16

9-2

Circuit

Board

Assembly

OP-19

18

9-3

Circuit

Diagram

OP-19

(±10V,

Phones,

LFO-1,

LFO-2,

S/H,

Noise

Gen.)

19

9-4

VCO

Board

Assembly

VO-3

20

9-5

Circuit

Diagram

VO-3

(VCO-1)

21

9-6

Circuit

Board

Assembly

OP-20

22

9-7

Circuit

Diagram

OP-20

(VCO-2,

Ring

Mod)

23

9-8

Mixer

Board

Assembly

OP-23

24

9-9

Circuit

Diagram

OP-23

(Mixer,

Ext.

Amp.)

25

9-10

Circuit

Board

Assembly

OP-21

26

9-11

Circuit

Diagram

OP-21

(VCF,

VCA,

BPF)

27

9-12

Circuit

Board

Assembly

OP-22

28

9-13

Circuit

Diagram

OP-22

(AR,

ADSR,

Fixed

Env.

Lamp.)

29

10.

SUB

CHASSIS

UNIT

ASSEMBLY

SU-1

30

10-1

Circuit

Diagram

SU-1

31

11.

POWER

SUPPLY

UNIT

ASSEMBLY

PC-5

32

11-1

Circuit

Diagram

PC-5

32

11-2

Power

Supply

Board

Assembly

PS-17

33

11-3

Power

Supply

Board

Assembly

PS-23

33

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1976-10-30

SH-5

12.

ADJUSTMENT

34

12-1

PS-17,

PS-23

..

34

12-1-1

+14V,

-14V

34

12-2

OP-19

34

12-2-1

+10V,

-10V

34

12-2-2

LFO-1

34

12-2-3

SAMPLE

&

HOLD

35

12-2-4

NOISE,

GENERATOR

36

12-3

K3-1

36

12-3-1

KEY

VOLTAGE

36

12-3-2

BENDER

VOLTAGE

37

12-4

VO-3

37

12-4-1

VCO

RANGE

SET

37

12-4-2

VCO-1

37

12-4-3

VCO-1

38

12-4-4

VCO-1

FREQUENCY

WIDTH

38

12-4-5

VCO-1

FREQUENCY

ADJUSTMENT

41

12-5

OP-20

41

12-5-1

VCO-2

41

12-5-2

VCO-2

41

12-5-3

VCO-2

FREQUENCY

WIDTH

42

12-5-4

VCO-2

FREQUENCY

ADJUSTMENT

42

12-5-5

RING

MOD

43

12-6

OP-21

44

12-6-1

VCA

44

12-6-2

VCF

45

12-7

OP-22

48

12-7-1

ADSR

48

13.

PARTS

LIST

49

13-1

OP-25

49

13-2

OP-19

49

13-3

VO-3

50

13-4

OP-20

51

13-5

OP-23

52

13-6

OP-21

52

13-7

OP-22

53

13-8

PS-17

53

13-9

PS-23

54

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I

1.

SPECIFICATIONS

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2.

FRONT

PANEL

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3.

DESCRIPTION

OF

ASSEMBLIES

The

MODEL

SH-5

consists

of

4 main

units

shown

below

in

order

of

disassembly

procedure.

1)

KEYBOARD

UNIT

ASSEMBLY

KB-1

2)

CONTROL

UNIT

ASSEMBLY

CU-1

3)

SUB

CHASSIS

UNIT

ASSEMBLY

SU-1

4)

POWER

SUPPLY

UNIT

ASSEMBLY

PC-5

3-1.

KEYBOARD

UNIT

ASSEMBLY

KB-1

This

unit

is

subdivided

into

smaller

blocks:

1)

KEYBOARD

ASSEMBLY

SK-142B

2)

CONTROL

UNIT

ASSEMBLY

CU-2

MANUAL

BOARD

ASSEMBLY

OP-25

BENDER

ASSEMBLY

PB-1

A.

Keyboard

Circuit

Consists

of

a

constant

current

source

fed

to

the

keyboard

resistors

which

provids

specific

voltage

drops

when

keyboard

keys

are

pressed.

This

voltage

is

fed

to

an

S

&

H

Circuit

where

it

is

held

until

another

voltage

is

produced

by

depressing

another

key.

The

output

of

this

circuit

is

used

for

controlling

the

VCO's

and

VCF.

A

second

circuit

generates

trigger-pulses

by

means

of

the

ON-OFF

manuals

under

the

keys

for

control

of

triggering

LFO-1, LFO-2,

S/H,

and

ENV

GEN.

B.

TUNING,

TRANSPOSE,

PORTAMENTO

Each

controls

2

VCO's

simultaneously.

C.

BENDER

The

voltage

output

is

variable

from

+

to

-,

and

the

circuit

is

for

the

control

of

VCO's

or

VCF,

selected

with

a

switch.

In

the

VCO

mode,

there

are

further

selections

of

3

ranges:

SEMI

-

WHOLE

-

QUINT.

Setting

the

slide

switch

on

VCF,

the

starting

tone

color

of the

bender

effect

can

be

changed

by

moving

the

CUT

OFF

FREQ.

control

in

the

VCF

section.

3-2.

CONTROL

UNIT

ASSEMBLY

CU-1

Subdivided

as

follows:

1)

CIRCUIT

BOARD

ASSEMBLY

OP-19

2)

VCO

BOARD

ASSEMBLY

VO-3

3)

CIRCUIT

BOARD

ASSEMBLY

OP-20

4)

MIXER

BOARD

ASSEMBLY

OP-23

5)

CIRCUIT

BOARD

ASSEMBLY

OP-21

6)

CIRCUIT

BOARD

ASSEMBLY

OP-22

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3-2-1.

CIRCUIT

BOARD

ASSEMBLY

OP-19

Contains:

±10V

Regulator,

PHONES,

LFO-1,

LFO-2,

S/H,

and

NOISE

GEN,

circuits.

A.

±10V

Regulator

The

constant

voltages

+14V

and

-14V

of the input

are

converted

into

highly

stable

D.C

outputs:

+10.00V

and

-10.00V.

Generally

speaking,

the

more

accurate

the

adjustment

(the

more

zeroes

after

the

decimal

point)

the

more

accurate

the

VCO

tracking

will

be.

B.

PHONES

Controls

the

LEVEL

without

any

relat/on

to

the

OUTPUT

LEVEL

of

VCA.

C.

LFO-1

This

is

a

Low

Frequency

Oscillator

to

produce

both

inverted

and

non-inverted

Sawtooth

waveforms

with

a

phase

difference

of

180°.

D.

LFO-2

Produces

Sine

wave,

Square

wave

(inverted

and

non-inverted),

and

Triangular

wave

for

use

in

modulation,

and

TRIG,

for

AR.

and

ADSR.

DELAY

TIME

utilizes

Sine

wave

alone.

E.S/H

This

circuit

is

for

sampling

voltages

from

different

waveforms,

using

LFO-1

(

|)j^

),

LFO-2

(

AA

),

and

RANDOM

(NOISE)

for

its

input

source.

The

output

can be

used

to

control

VCO-1

and

the

VCF

for

getting

special

effects.

Sample

time

decides

the

timing

of

the

sampling

operation.

Lag

time

uses

an

RC

filter

to

add

lag

to

quick

voltage

changes.

F.

NOISE

GEN.

The

sound

source

here

is

the

white

noise

produced

at

the

B-E

(base

—

emitter)

junction of

a

reverse

biased

transistor.

It

is

amplified

and,

through

filtering,

is

changed

to

either

WHITE

or

PINK

at

the

output.

3-2-2.

VCO

BOARD

ASSEMBLY

VCO-1

A

VCO

is

an

oscillator

whose

frequency

is

controlled

by

a

control

voltage

coming

from

the

Keyboard

or

other

external

sources.

Incoming

linear

control

voltages

are

first

converted

into

voltages

with

an

exponential

increasing

ratio.

The

oscillator

itself

is

a

sawtooth

generator.

Wave

shapers

convert

this

sawtooth

to

triangle

and

square

waves.

This

assembly

functions

as

VCO-1,

and

is

capable

of

synchronous

driving

of

VCO-2

by

means

of

the

synchronizing

pulses

generated

in

this

assembly.

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3-2-3.

CIRCUIT

BOARD

ASSEMBLY

OP-20

VCO-2,

RING

MOD.

VCO-2

is

an

oscillator

which

is

about

the

same

as

VCO-1.

With

the

Keyfollower

turned

to

OFF,

the

frequencies

generated

here

are

held

at

a

constant

level

and

not

subject

to

follow

the

keyboard.

RING

MOD.

(ring

modulator)

is

a

circuit

for

producing

sounds

of

special effect,

such

as

bell-like

sounds.

The

sum

and

difference

of

the

two

input

frequencies

are

the

only

frequencies

to

appear

at

the

output

of

the

ring

modulator.

3-2-4.

MIXER

BOARD

ASSEMBLY

OP-23

This

is

the

section

that

decides

where

the

signals

coming

from

NOISE

GEN.,

VCO-1,

VCO-2,

RING

MOD.,

EXT.

IN.

will

go.

Also

provided

here

is

an

amplifier

circuit

for

the

signals

of

EXT.

IN.

3-2-5.

CIRCUIT

BOARD

ASSEMBLY

OP-21

VCF,

BAND

PASS

FILTER,

VCA

The

VCF

is

a

Voltage

Controlled

Filter

and

can

be

used

either

as:

LPF,

BPF, and

HPF.

The

LPF

consists

of

a

ladder

type

network

of

diode

chain

transistors,

and

is

capable

of

generating

by

itself

fre

quencies

of

a

wide

range

so

that

it

can

be

used

to

make

musical

scales

following

the

keyboard

manuals.

Band

Pass

Filter

is,

unlike

the

others,

a

fixed

filter

and

not

voltage

controlled.

The

VCA

has

its

gain

under

control

of the

control

voltage

applied

to

the base of

the

current

source

transistor

in

this

circuit.

3-2-6.

CIRCUIT

BOARD

ASSEMBLY

OP-22

AR,

ADSR,

FIXED

ENV.

The

Envelope

Generators

have

separate

controls

for

controlling

the

elements

of

the

envelopes

(ATTACK

and

RELEASE

for

the

AR,

and

ATTACK,

DECAY,

SUSTAIN:,

and

RELEASE

for

the

ADSR).

The

Envelope

Generators

are

triggered

from

the

Keyboard

Circuit

gate

pulses

or

from

LFO-2,

S/H,

or

EXT.

The

FIXED

ENV,

however,

is

triggered

only

by

the

keyboard

gate

pulse.

3-3.

SUB

CHASSIS

UNIT

ASSEMBLY

SU-1

(Including

Pack

Assembly

BX-13)

Located

here

are

the

output

jacks

of

SH-5,

also

with

jacks

for

control

from

external

sources.

3-4.

POWER

SUPPLY

UNIT

ASSEMBLY

PC-5

This

is

to

produce

the

regulated

±14V

and

in

order

to secure

voltage

accuracy,

potentiometers

are

provided

in

this

circuit.

Note

that

PS-17

is

for

100

-

120V,

while

PS-23

is

for

200

-

250V.

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1976-10-30

SH-5

4.

GENERAL

CAUTIONS

4-1.

Fuses

When

replacing

fuses,

use

only

those

rated

as

shown

on

the

caution

label

on

the

circuit

board.

Repeatedly

blown

fuses

indicate

something

wrong

with

the

circuits.

Using

larger

value

fuses

will

only

aggravate

this

condition

and

will

result

in

damage

to

the

circuits.

4-2.

Adjustment

Calibration

adjustments

should

be

done

in

the

order

given.

Accurate

adjustment

can

be

assured

only

if

the procedures

are

followed

exactly

as

given.

4-3.

Slide

Switch

Double

check

the

positions

of

slide

switches.

Slide

switches

set

in

between

positions

is

the

largest

cause

of

malfunction

of

this

synthesizer.

4-4.

Replacement

of

parts

Use

only

those

as

specified

in

the

Parts

List.

Use

of

parts

other

than

as

specified

can

cause

function

instability

or

circuit

damage.

-8-

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SH-5

5.

GENERAL

BLOCK

DIAGRAM

HOLD

PORTAMENTO

VARIABLE

OFF

FIXED

TRIG.

CIRCUIT

BENDER

VCO

SEMI

WHOLE

QUINT

VCF

TUNE

TRANSPOSE

L-M-H

CONTROLLERS

COMPUTAR

or

SEQUENCER

KYBD«NOTE

TO

VCO

TO

VCF

SYNC

OUT

RANGE

—

2.4.8.

16.32

PITCH

—

OSC

WAVE

FORM

AAN\

runu

u

VOLT.

CONT

II

MOD.

—J

MANUAL

VCO-1

PULSE

WIDTH

MOD.

ENVELOPE

GEN.

ADSR

KYBD

FOlPw

ON/OFF

RANGE

2.4.8.

—

16.32

PITCH

-

MOD.

-J

WAVE

FORM

J

VOLT.

CONT

WIDTH

I—I

MOD.

vco-J

RING

MOO.

EXT.

IN

JACK

AUDIO

ORGAN:

H

GUITAR:

M

.MIC:

L

VCO-1

LEVEL

VCO-2

LEVEL

RING

MOD.

-

LEVEL

VCF

VCF+

BPF

VCA

EXT.

IN

LEVEL

NOISE

LEVEL

MIXER

EXPRESSION

PEDAL

CONT.

FREQ

RESONANCE

LEVEL

•

VCF

CONT.

JACK

HPF

BPF-

LPF

RESONANCE

II

CUT

OFF

_

FREQ.

\

MOD.

—

VOLT.

CONT

VCF

PANNING

VOLT.

CONT

AR

ADSR

'

VCA

OUT

LEVEL

PHONES

MONO

OUT

STEREO

OUT

L-R

ADSR.

AR,

FIXED

ENV.

-9-

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Roland SH-5 Operating and maintenance manual

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