Sequential Pro One Manuel utilisateur

MODEL

BOO

Manual

No.

TM100A

PRCLONE

SYNTHESIZER

TECHNICAL

MANUAL

Stanley

Jungleib

Sequentid

Circuits,

Inc.

3951

North

1st

Street

Sari

Jose,

95134

(408)

946-5240

TELEX:

36441

INTR

706

PRO-ONE

SYNTHESIZER

TECHNICAL

MANUAL

Stanley

Jungleib

Manual

No.

OOA

Issued: December,

1981

~o~~ri~ht@1981

SEQUENTIAL

CIRCUITS,

INC.

All

rights

reserved.

Printed

USA.

The

contents

this

manual

are

the

property

SCI

and

are

not

copied

reproduced

without

our

prior written

permission.

Data

sheets

reprinted

the

Appendix

are

courtesy

RCA

and

Curtis

Electrornusic

Specialties.

Table

Contents

SECTION

FUNCTIONAL

TESTS

INTRODUCTlON

PKEPARATION

KEYBOARD

TEST

OSCILLATOR

TEST

OSCILLATOR

TEST

MIXER

AND

NOISE

TEST

PITCH

WHEEL

AND

GLIDE

TEST

FILTEK

TEST

AMPLIFIER

TEST

MODULATION

TEST

BACK

PANEL

TEST

TUNING

FLOW

CHART

SECTION

THEORY

OPERATION

INTRODUCTION

GENERAL

OSCILLATOR

M1XER/NOISE/EXTERNAL

FILTER

FINAL

VCA

ENVELOPE

GENERATORS

MODULATION

SOURCES

LFO

MICROCOMPUTER

KEYBOARD/SWJTCH

MATRIX

DAC

GLIDE

GATE

AND

TRIGGER

LOGIC

POWER

SUPPLY

3-0

DOCUMENT

LIST

DOCUMENT

NOTES

SECTION

MECI-IANICAI,

INTRODUCTION

4-0

4-1

OPENING

CASE

AND

REMOVING

PCB

4-1

4-2

REVISION

LO/

PCB

MOUNTING

MODIFICA+ION

4-2

REVISION

1.01

1.1

POWER

CONNECTOR MODIFICATION

4-4

REPLACING

AND

ADJUSTING

WHEELS

4-4

TMIOOA

12/81

iii

SECTTON

SERVICE

5-0

INTRODUCTION

DAC

SCALE

5-2

TUNING

5-3

AMPLIFIER

BALANCE

DIGITAL

INTERFACE

SECTION

PARTS

6-0

CHASSIS

PCB

SECTION

GLOSSARY

APPENDIX

DATA

SHEETS

CA3280

DUAL

OPERATIONAL

TRANSCONDUCTANCE

AMPLIFER

CEM

VOLTAGE

CONTROLLED

ENVELOPE

GENERATOR

CEM

3320

VOLTAGE

CONTROLLED

FILTER

CEM

334013345

VOLTAGE

CONTROLLED

OSClLLATOR

SECTlON

FUNCTIONAL

TESTS

1-0

INTRODUCTION

This

section contains procedures

for

complete functional

testing

the

Pro-One.

The

functional

tests check

all

signal

paths

and

the range

the oscillators.

flow-chart

for

selectively checking

tuning-

page

1-12.

correct

oscillator tuning,

see

the

Service

procedures

in Section

Instruments

serviced

should

completely tested

beforehand.

This

will

reveal

unrelated malfunctions,

and

provide

basis

for

troubleshooting,

trim

can't

achieved

service

will:

certainly

required. In such

cases,

consult the

theory

operation

and

diagrams

Section

and

schematics

Section

isolate the

failure.

Mechanical

procedures are in

Section

When

operating disassembled it

can

difficult

read

the

controls:

Figure

3-1

may

help.

Also,

when

disassembled

often convenient

leave

the

wheel

cable

disconnected.

The

Pro-One will operate

normally,

that

is,

without

pitch

bend

modulation.

These

procedures

are

presented

the order recommended

for

Pro-One

assumed

completely operational.

Real-world

problems

may

require

you

change

the

order

some

tests.

Therefore each is written to

performed independently.

You

must

play

the

Pro-One

throughout

these

tests

(or

use

the ascending

and

descending

scales

preprograrnrned

into

SEQ

and

SEQ

power-up).

All

tests

are

performed

ear,

the

object

generally

being

that the

knobs

adjust smoothly

and

switches

work.

Toggle the

panel

switches repeatedly

check for intermittents.

1-1

PREPARATION

Connect

headphones,

mono

cable

between

back

panel

AUDIO

OUT

jack

and

power

amplifier,

Check

back

panel

14/23O

line

voltage selector.

Check

that

back

panel

power

switch

off.

operating

disassembled, testing

may

facilitated

placing the knobs lightly

back

their shafts..

Connect

power

cable

properly-grounded

outlet.

Switch

power

on.

WARNING!

LETHAL

VOLTAGE

PRUENT

THE

POWER

SUPPLY

AREA

THE

PCB

(IN

EARLIER

MODELS)

THE

BACK

PANEL

(IN

LASER

MODELS).

Center

MASTER

TUNE

and PITCH

wheel

and

set

MOD

wheel

minimum

(unless

*the

wheel

cable is disconnected).

Adjust

VOLUME

required, below.

1-2

KEYBOARD

EST

Patch according

Figures

1-1

1-2.

The

essential features

these

patches

are

fully

"open"

AMPLIFIER

and

FILTER,

the sawtooth

one oscillator is

on,

and

there

modulation.

Check

that

all

keys

work. Make

note

scratchy,

intermittent,

inoperative

keys,

Oxidation,

particularly

lesser-used

keys,

can

cause

keys

"dead,rt

and

may

aggravated

ambient

conditions or

handling.

Check

also

for

contact bounce

hitting

each

key

hard

and

repeatedly

while

listening for break-up

double

triggering.

For

either condition, cleaning

careful

readjustment

the

"J-wirestr

often

a1that

necessary. After

the

top

panel

removed,

the

keyboard

can

detached

from

the

bottom

panel

for

cleaning

simply

removing

four

screws.

Wipe

the

contacts

carefully

with an alcohol-

freon-wetted cotton

swab.

Donqt

use

any

abrasive

techniques,

this will simply

remove

the

gold plating.

Replacement

J-wires

can

ordered

SCI

#S-051.

the

keyboard

doesn't

work

all,

check

its

connector. The

GATE

LED

should

light

whenever

key

pressed.

still

there

no sound,

check

Final

VCA

(para.

1-8).

Switch

DRONE

an.

You

should

hear

continuous

tone.

The

frequency will

change

you play various

keys,

but

the

tone itself

not

interrupted.

Switch

DRONE

off.

Switch

REPEATJEXT

on.

The

frequency

the last

key

played

repeats

rate

set

the

LFOJCLOCK

FREQUENCY

knob.

Keys

will

not

heard

when

played,

but

repeated pitch will change. Switch

REPEATIEXT

back

NORMAL.

6..

To check

demonstrate low-note priority, hold

key

and

hit

one

above it.

The

higher

key

will

not

sound.

Now

hold the

higher

key

and

hit

the

lower

one.

The

rower

key

sounds

when

pressed.

Switch

MODE

from

NORMAL

RETRIG.

Note

that

this

switches from low-note

last-note

priority.

The

newest

key

sounds though

lower

key

may

held.

Hold

several notes

and

switch

ARPEGGIATE

UP,

then

UP/DOWN

check

function.

While

arpeggiating,

switch

SEQUENCER

RECORD

and

remove

hand

from

keyboard.

The

arpeggiator

should

remain "latched."

Switch

ARPEGGIATE

off.

With

SEQUENCER

RECORD

still

on,

select

SEQ

and

record

sequence.

Play

back. Repeat

for

SEQ

1-3

OSCILLATOR

TEST

Figure

1-1

OSC

TEST

PATCH

Patch

according

Figure

1-1.

Check

that

0SC

FREQUENCY

knob

range

exceeds

one

octave.

For

reference,

play

(which

one

octave

below

the

highest

key,

C3)

and

remember

pitch.

Then

hold

and

raise

OSC

FREQ.

The

pitch should

increase

smoothly,

approaching

the

reference

pitch

the

dial.

the

pitch

should

least

whole

step

above

the

reference.

Turn

OSC

FREO

Check

OSC

OCTAVE

switch

function

playing

and

switching

octaves

down

and

NOTE:

When

switching

octaves

with

key

depressed,

normal

hear

the

pitch

"jump"

between

octaves.

Switch

OSC

OCTAVE

and

switch

OSC

SYNC

on.

Rotate

OSC

FREQ

knob

check

sync

function.

Switch

OSC

SYNC

off.

Switch

OSC

SAWTOOTH

off.

Switch

05C

PULSE

on.

The

difference

between

the

'Ibrassylr

sawtooth

and

tfwoody"

pulse

should

obvious.

Rotate

OSC

PULSE

WIDTH

knob

lo,

listening

for

the

timbral

effect

varying

harmonics.

The

pulse

will

degenerate

(or

very

nearly

dc--99%

duty

cycle)

the

extreme

knob

settings,

resulting

(or

very

little)

sound.

Find

the

setting

where

the

second

harmonic

drops

out

(50%

duty

cycle).

This

normally

occurs

between

dial

markings

and

1-4

OSCILLATOR

lF5T

Figure

1-2

OSC

TEST

PATCH

Patch

according to Figure

1-2.

Check

that

OSC

FREQUENCY

knob

range

exceeds

one

octave.

For

reference,

play

and

remember pitch. Then

hold

and

raise

OSC

FREQ.

The

pitch should

increase

smoothly,

approaching

the

reference

tone

the

dial.

the

pitch

should

least

whole

step

above

the

reference.

Turn

OSC

FKEQ

0. Check OSC

OCTAVE

switch

playing

and

switching

octaves

down

and

NOTE:

When

switching

octaves

with

key

depressed,

normal

hear

the

pitch

"jump"

between

octaves.

Switch

OSC

OCTAVE

Switch

OSC

SAWTOOTH

off.

Switch

OSC

TRIANGLE

on.

The

difference

between

the

''brassy"

sawtooth

and

"dull1'

triangle

wave

should

obvious.

The

triangle

waveshape

has

very

little

harmonic

energy.

Switch

OSC

TRIANGLE

off.

Switch

OSC

PULSE

on.

Rotate

OSC

PULSE

WIDTH

knob

10,

listening

for

the

timbral

effect

varying

harmonics.

The

pulse will

degenerate

(or

very

nearly

dc--99%

duty

cycle)

the

extreme

knob

settings, resulting

(or

very

little)

sound.

Find

the

setting

where

the

second

harmonic

drops out

(50%

duty

cycle).

This

normally

occurs

between

dial

markings

and

Switch

OSC

FREQ

on.

Raise

6SC

FREQ

about

easily

hear

OSC

"track"

the

keyboard

lev$

frequencies.

NOTE:

OSC

FREQ

switch

extends

OSC

B's

FREQ

range

sub-audio.

therefore

normal

qhat

OSC

FREQUENCY

set

10,

the

FREQ

switch

will

appear

have

effect.

Switch

05C

FREQ

NORMAL.

Switch

OSC

KYBD

off

and

check

that

OSC

ceases

"tracking"

the

keyboard.

1-5

MIXER

NOEE

TElST

Figure

1-3

MIXER

and

NOISE

TEST

PATCH

Patch

according

Figure

1-3,

Hold

key

and

turn

MIXER

OSC

knob

10.

Check

for

smooth

vohme

increase.

Leave

knob

set

Turn

MIXER

OSC

knob

10.

Check

for

smooth

voEurne

increase.

OSC

should

loud

OSC

Leave

knob

set

Turn

MIXER

NOlSE/EXT

knob

10.

Check

for

smooth

noise

volume

increase.

(Since

noise

unpitched,

does

not

track

the

keyboard).

Leave

knob

set

External

audio

input

checked

during

the

BACK

PANEL

test

(para.

1-10).

TMlOOA

12/81

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