Roland SH-5 Bedienungs- und Wartungshandbuch

WPW.

MANUAL

MANOR

SH-5

Service

Notes

Scan by Manual Manor

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CONTENTS

SPECIFICATIONS

FRONT

PANEL

ASSEMBLY

DESCRIPTION

3-1

Keyboard

Unit

Assembly

K3-1

3-2

Control

Unit

Assembly

CU-1

3-3

Sub

Chassis

Unit

Assembly

SU-1

3-4

Power

Supply

Unit

Assembly

PC-5

GENERAL

CAUTIONS

GENERAL

BLOCK

DIAGRAM

CABINET

DISASSEMBLY

WIRING

BLOCK

DIAGRAM

KEYBOARD

UNIT

ASSEMBLY

KB-1

8-1

Keyboard Assembly

SK-142B

8-2

Bender

Assembly

PB-1

8-3

Control Unit

Assembly

CU-2

8-4

Manual

Board

Assembly

OP-25

8-5

Circuit

Diagram

KB-1

CONTROL

UNIT

ASSEMBLY

CU-1

9-1

Circuit

Diagram

CU-1

9-2

Circuit

Board

Assembly

OP-19

9-3

Circuit

Diagram

OP-19

(±10V,

Phones,

LFO-1,

LFO-2,

S/H,

Noise

Gen.)

9-4

VCO

Board

Assembly

VO-3

9-5

Circuit

Diagram

VO-3

(VCO-1)

9-6

Circuit

Board

Assembly

OP-20

9-7

Circuit

Diagram

OP-20

(VCO-2,

Ring

Mod)

9-8

Mixer

Board

Assembly

OP-23

9-9

Circuit

Diagram

OP-23

(Mixer,

Ext.

Amp.)

9-10

Circuit

Board

Assembly

OP-21

9-11

Circuit

Diagram

OP-21

(VCF,

VCA,

BPF)

9-12

Circuit

Board

Assembly

OP-22

9-13

Circuit

Diagram

OP-22

(AR,

ADSR,

Fixed

Env.

Lamp.)

10.

SUB

CHASSIS

UNIT

ASSEMBLY

SU-1

10-1

Circuit

Diagram

SU-1

11.

POWER

SUPPLY

UNIT

ASSEMBLY

PC-5

11-1

Circuit

Diagram

PC-5

11-2

Power

Supply

Board

Assembly

PS-17

11-3

Power

Supply

Board

Assembly

PS-23

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1976-10-30

SH-5

12.

ADJUSTMENT

12-1

PS-17,

PS-23

12-1-1

+14V,

-14V

12-2

OP-19

12-2-1

+10V,

-10V

12-2-2

LFO-1

12-2-3

SAMPLE

HOLD

12-2-4

NOISE,

GENERATOR

12-3

K3-1

12-3-1

KEY

VOLTAGE

12-3-2

BENDER

VOLTAGE

12-4

VO-3

12-4-1

VCO

RANGE

SET

12-4-2

VCO-1

12-4-3

VCO-1

12-4-4

VCO-1

FREQUENCY

WIDTH

12-4-5

VCO-1

FREQUENCY

ADJUSTMENT

12-5

OP-20

12-5-1

VCO-2

12-5-2

VCO-2

12-5-3

VCO-2

FREQUENCY

WIDTH

12-5-4

VCO-2

FREQUENCY

ADJUSTMENT

12-5-5

RING

MOD

12-6

OP-21

12-6-1

VCA

12-6-2

VCF

12-7

OP-22

12-7-1

ADSR

13.

PARTS

LIST

13-1

OP-25

13-2

OP-19

13-3

VO-3

13-4

OP-20

13-5

OP-23

13-6

OP-21

13-7

OP-22

13-8

PS-17

13-9

PS-23

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SPECIFICATIONS

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un-u

FRONT

PANEL

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DESCRIPTION

ASSEMBLIES

The

MODEL

SH-5

consists

4 main

units

shown

below

order

disassembly

procedure.

KEYBOARD

UNIT

ASSEMBLY

KB-1

CONTROL

UNIT

ASSEMBLY

CU-1

SUB

CHASSIS

UNIT

ASSEMBLY

SU-1

POWER

SUPPLY

UNIT

ASSEMBLY

PC-5

3-1.

KEYBOARD

UNIT

ASSEMBLY

KB-1

This

unit

subdivided

into

smaller

blocks:

KEYBOARD

ASSEMBLY

SK-142B

CONTROL

UNIT

ASSEMBLY

CU-2

MANUAL

BOARD

ASSEMBLY

OP-25

BENDER

ASSEMBLY

PB-1

Keyboard

Circuit

Consists

constant

current

source

fed

the

keyboard

resistors

which

provids

specific

voltage

drops

when

keyboard

keys

are

pressed.

This

voltage

fed

Circuit

where

held

until

another

voltage

produced

depressing

another

key.

The

output

this

circuit

used

for

controlling

the

VCO's

and

VCF.

second

circuit

generates

trigger-pulses

means

the

ON-OFF

manuals

under

the

keys

for

control

triggering

LFO-1, LFO-2,

S/H,

and

ENV

GEN.

TUNING,

TRANSPOSE,

PORTAMENTO

Each

controls

VCO's

simultaneously.

BENDER

The

voltage

output

variable

from

and

the

circuit

for

the

control

VCO's

VCF,

selected

with

switch.

the

VCO

mode,

there

are

further

selections

ranges:

SEMI

WHOLE

QUINT.

Setting

the

slide

switch

VCF,

the

starting

tone

color

of the

bender

effect

can

changed

moving

the

CUT

OFF

FREQ.

control

the

VCF

section.

3-2.

CONTROL

UNIT

ASSEMBLY

CU-1

Subdivided

follows:

CIRCUIT

BOARD

ASSEMBLY

OP-19

VCO

BOARD

ASSEMBLY

VO-3

CIRCUIT

BOARD

ASSEMBLY

OP-20

MIXER

BOARD

ASSEMBLY

OP-23

CIRCUIT

BOARD

ASSEMBLY

OP-21

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.

±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

accurate

the

adjustment

(the

zeroes

after

the

decimal

point)

the

accurate

the

VCO

tracking

will

be.

PHONES

Controls

the

LEVEL

without

any

relat/on

the

OUTPUT

LEVEL

VCA.

LFO-1

This

Low

Frequency

Oscillator

produce

both

inverted

and

non-inverted

Sawtooth

waveforms

with

phase

difference

180°.

LFO-2

Produces

Sine

wave,

Square

wave

(inverted

and

non-inverted),

and

Triangular

wave

for

use

modulation,

and

TRIG,

for

AR.

and

ADSR.

DELAY

TIME

utilizes

Sine

wave

alone.

E.S/H

This

circuit

for

sampling

voltages

from

different

waveforms,

using

LFO-1

(

|)j^

LFO-2

(

and

RANDOM

(NOISE)

for

its

input

source.

The

output

can be

used

control

VCO-1

and

the

VCF

for

getting

special

effects.

Sample

time

decides

the

timing

the

sampling

operation.

Lag

time

uses

filter

add

lag

quick

voltage

changes.

NOISE

GEN.

The

sound

source

here

the

white

noise

produced

the

B-E

(base

—

emitter)

junction of

reverse

biased

transistor.

amplified

and,

through

filtering,

changed

either

WHITE

PINK

the

output.

3-2-2.

VCO

BOARD

ASSEMBLY

VCO-1

VCO

oscillator

whose

frequency

controlled

control

voltage

coming

from

the

Keyboard

other

external

sources.

Incoming

linear

control

voltages

are

first

converted

into

voltages

with

exponential

increasing

ratio.

The

oscillator

itself

sawtooth

generator.

Wave

shapers

convert

this

sawtooth

triangle

and

square

waves.

This

assembly

functions

VCO-1,

and

capable

synchronous

driving

VCO-2

means

the

synchronizing

pulses

generated

this

assembly.

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3-2-3.

CIRCUIT

BOARD

ASSEMBLY

OP-20

VCO-2,

RING

MOD.

VCO-2

oscillator

which

about

the

same

VCO-1.

With

the

Keyfollower

turned

OFF,

the

frequencies

generated

here

are

held

constant

level

and

not

subject

the

keyboard.

RING

MOD.

(ring

modulator)

circuit

for

producing

sounds

special effect,

such

bell-like

sounds.

The

sum

and

difference

the

two

input

frequencies

are

the

only

frequencies

appear

the

output

the

ring

modulator.

3-2-4.

MIXER

BOARD

ASSEMBLY

OP-23

This

the

section

that

decides

where

the

signals

coming

from

NOISE

GEN.,

VCO-1,

VCO-2,

RING

MOD.,

EXT.

IN.

will

go.

Also

provided

here

amplifier

circuit

for

the

signals

EXT.

IN.

3-2-5.

CIRCUIT

BOARD

ASSEMBLY

OP-21

VCF,

BAND

PASS

FILTER,

VCA

The

VCF

Voltage

Controlled

Filter

and

can

used

either

as:

LPF,

BPF, and

HPF.

The

LPF

consists

ladder

type

network

diode

chain

transistors,

and

capable

generating

itself

fre

quencies

wide

range

that

can

used

make

musical

scales

following

the

keyboard

manuals.

Band

Pass

Filter

is,

unlike

the

others,

fixed

filter

and

not

voltage

controlled.

The

VCA

has

its

gain

under

control

of the

control

voltage

applied

the base of

the

current

source

transistor

this

circuit.

3-2-6.

CIRCUIT

BOARD

ASSEMBLY

OP-22

AR,

ADSR,

FIXED

ENV.

The

Envelope

Generators

have

separate

controls

for

controlling

the

elements

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

from

LFO-2,

S/H,

EXT.

The

FIXED

ENV,

however,

triggered

only

the

keyboard

gate

pulse.

3-3.

SUB

CHASSIS

UNIT

ASSEMBLY

SU-1

(Including

Pack

Assembly

BX-13)

Located

here

are

the

output

jacks

SH-5,

also

with

jacks

for

control

from

external

sources.

3-4.

POWER

SUPPLY

UNIT

ASSEMBLY

PC-5

This

produce

the

regulated

±14V

and

order

to secure

voltage

accuracy,

potentiometers

are

provided

this

circuit.

Note

that

PS-17

for

100

120V,

while

PS-23

for

200

250V.

Scan by Manual Manor

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1976-10-30

SH-5

GENERAL

CAUTIONS

4-1.

Fuses

When

replacing

fuses,

use

only

those

rated

shown

the

caution

label

the

circuit

board.

Repeatedly

blown

fuses

indicate

something

wrong

with

the

circuits.

Using

larger

value

fuses

will

only

aggravate

this

condition

and

will

result

damage

the

circuits.

4-2.

Adjustment

Calibration

adjustments

should

done

the

order

given.

Accurate

adjustment

can

assured

only

the procedures

are

followed

exactly

given.

4-3.

Slide

Switch

Double

check

the

positions

slide

switches.

Slide

switches

set

between

positions

the

largest

cause

malfunction

this

synthesizer.

4-4.

Replacement

parts

Use

only

those

specified

the

Parts

List.

Use

parts

other

than

specified

can

cause

function

instability

circuit

damage.

-8-

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1976-10-30

SH-5

GENERAL

BLOCK

DIAGRAM

HOLD

PORTAMENTO

VARIABLE

OFF

FIXED

TRIG.

CIRCUIT

BENDER

VCO

SEMI

WHOLE

QUINT

VCF

TUNE

TRANSPOSE

L-M-H

CONTROLLERS

COMPUTAR

SEQUENCER

KYBD«NOTE

VCO

VCF

SYNC

OUT

RANGE

—

2.4.8.

16.32

PITCH

—

OSC

WAVE

FORM

AAN\

runu

VOLT.

CONT

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

VOLT.

CONT

WIDTH

I—I

MOD.

vco-J

RING

MOO.

EXT.

JACK

AUDIO

ORGAN:

GUITAR:

.MIC:

VCO-1

LEVEL

VCO-2

LEVEL

RING

MOD.

LEVEL

VCF

VCF+

BPF

VCA

EXT.

LEVEL

NOISE

LEVEL

MIXER

EXPRESSION

PEDAL

CONT.

FREQ

RESONANCE

LEVEL

•

VCF

CONT.

JACK

HPF

BPF-

LPF

RESONANCE

CUT

OFF

FREQ.

MOD.

—

VOLT.

CONT

VCF

PANNING

VOLT.

CONT

ADSR

VCA

OUT

LEVEL

PHONES

MONO

OUT

STEREO

OUT

L-R

ADSR.

AR,

FIXED

ENV.

-9-

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