Sequential Prophet 5 Manuale utente

pRophet-^

TECHNICAL

MANUAL

^EOUEnUiAL

ci^cuici

;nc

About

This

Manual

and

Servicing

The

Prophet

The

Prophet

sophisticated

instrument,

and

SEQUENTIAL

CIRCUITS

INC.

issues

its

technical

manual

for

use

qualified

technicians

only.

course

the

manual

will

also

read

Prophet

owners

and

others

interested

synthesizer

design.

And

realize

will

also

used

some

modify

their

instruments.

While

support

this

innovative

attitude

spirit,

cannot

support

financially.

Modifications

unauthorized

service

void

the

Prophet's

warranty.

They

also

invariably

extend

service

time

(thus,

cost)

factory

repair

required.

Familiarize

yourself

thoroughly

with

this

manual

before

attempting

any

work

the

Prophet.

This

will

least

help

you

judge

whether

you

should

working

all.

doubt

please

contact

our

Service

Department.

The

manual

organized

follows:

SECTION

describes

the

Prophet's

physical

organization

and

procedure

for

its

complete

disassembly.

SECTION

covers

principles

the

system

(hardware

and

software)

design.

SECTION

contains

complete

schematics

and

pictorials

identifying

all

components.

SECTION

explains

how

tune

and

adjust

the

Prophet

for

optimum

musicality.

SECTION

offers

aid

identifying

and

correcting

malfunctions.

SECTION

included

for

you

order

replacement

parts

from

SCI.

Your

response

the

Manual

User’s

Questionnaire

the

page

will

help

monitor

our

publication’s

usefulness.

MODEL

1000

PROPHET-5

SYNTHESIZER

TECHNICAL

MANUAL

STANLEY

JUNGLEIB

Wine

Country

Productions,

Inc.

1572

Park

Crest

Court.

Su4e

#505

San

Jose.

CaWomia

95110

USA

nooe

(408)

265-2008

PAX

(408)

266-6591

SEQUENTIAL

Product

Soecw/.sTs

Since

1987

058

MANUAL

NO.

TM1000C

Issued:

January.

1980

SEQUENTIAL

CIRCUITS.

INC

All

rights

reserved.

Printed

USA.

The

contents

this

manual

are

the

property

SCI

and

are

not

copied

reproduced

any

whatsoever

without

our

prior

written

permission.

manner

Table

Contents

SECTION

MECHANICAL

PROCEDURES

1-0

GENERAL.

1-1

PRECAUTIONS

1-2

SERVICE

POSITION.

1-3

PC84

VOICE

BOARD

SWINGOUT

REMOVAL

1-4

PCB3

COMPUTER

BOARD

REMOVAL.

1-5

PCB1

AND

CONTROL

PANEL

REMOVAL

....

1-6

PCB6

POWER

SUPPLY

BOARD

REMOVAL-

1-7

KEYBOARD

REMOVAL.

PAGE

1-1

1-3

1-4

1-5

1-6

1-7

1-8

THEORY

OPERATION

2-0

OVERVIEW.

2-1

SYNTHESIZER

BACKGROUND.

2-2

THE

PROPHET.

2-3

VOICE

FUNCTION

2-4

OSCILLATOR

(OSC

A).

2-5

OSCILLATOR

(OSC

2-6

FILTER

ENVELOPE

GENERATOR

(FILT

ENV

GEN)

2-7

FILTER

(FILT).

2-8

AMPLIFIER

ENVELOPE

GENERATOR

(AMP

ENV

GEN)

AND

AMPLIFIER

(FIN

2-9

AUDIO

OUT

(AUD

OUT).

2-10

COMMON

ANALOG.

2-11

MICROCOMPUTER

SYSTEM.

2-12

AND

GENERATION

2-13

MATRICES

2-14

POTENTIOMETER

MULTIPLEXER

(POT

MUX)

AND

ANALOG

DIGITAL

CONVERSION

(ADC)

2-15

TUNE.

2-16

HARDWARE

DESCRIPTION.

2-17

BD001

INTERCONNECTION.

2-18

SD211

CONTROL

PANEL-POTS

2-19

SD212

CONTROL

PANEL-SWITCH

AND

LED

MATRICES

2-20

SD311

COMPUTER-CPU.

MEMORY.

I/O.

2-21

SD312

ADC.

DAC,

COMMON

ANALOG.

2-22

SD313TUN

MUX.S/HS.

AUDOUT.

2-23

SD411-15

VOICES

1-5.

2-24

SD711

BACK

PANEL

AND

PCB6

2-1

2-4

2-7

2-8

2-11

2-12

2-16

2-18

2-19

2-20

2-21

2-22

2-26

2-27

2-32

DOCUMENTS

3-0

DOCUMENT

LIST

3-1

DOCUMENT

NOTES

SECTION

TRIMMING

AND

TUNING

4-0

GENERAL.4-1

4-1

PREPARATION

4-2

R603

+15V

ADJUSTMENT

.4-3

4-3

R301

DAC

GAIN

4-3

4-4

R302

ADC

GAIN

.4-3

4-5

R304

WHEEL-MOD

NOISE

VCA

8ALANCE.

4-4

4-6

R305

WHEEL-MOD

LFO

VCA

BALANCE

-4

4-7

R306

LFO

TRIANGLE

SYMMETRY.

-4

4-fl

R307

MASTER

SUMMER

OFFSET

4-6

4-9

TRIMMINC

THE

VOICES

.4-6

4-10

R401

AMPLIFIER

ENVELOPE

GENERATOR

TIME

CONSTANT.4-6

4-11

R402

FILTER

ENVELOPE

GENERATOR

TIME

CONSTANT.4-7

4-12

R403

FILTER

ENVELOPE

AMOUNT

VCA

BALANCE

.4-7

4-13

R404

POLY-MOD

FILTER

ENVELOPE

AMOUNT

VCA

BALANCE

...

4-7

4-14

R405

POLY-MOD

OSCILLATOR

AMOUNT

VCA

BALANCE

_4-7

4-15

R413

OSCILLATOR

TRIANGLE

SYMMETRY

.4-8

4-16

R415

FINAL

VCA

BALANCE.4-8

4-17

FILTER

TUNING.4-8

4-18

OSCILLATOR

TUNING.4-9

4-19

R416

VOICE

LEVEL.4-13

R303

SEQUENCER

OFFSET.4-13

SECTION

SERVICE

NOTES

GENERAL.5-1

5-1

POT

MUX/ADC

.5-1

5-2

KEYBOARD

(KBD).5-1-

5-3

SWITCH

MATRIX.5-1-

5-4

LED

MATRIX.5-2

5-5

COMPUTER.5-2

5-6

NON-VOLATILE

PROCRAM

MEMORY.5-3.

5-7

DAC.

OMUX.

S/HS.5-4

5-8

COMMON

ANALOC.5-4

5-9

AUDIO

OUTPUT.5-4

5-10

VCOS

.5-4

5-11

VCAS.5-4.

5-12

ENV

GENS

.5-4

5-13

VCFS.5-5

5-14

POWER

SUPPLY.5-5

SECTION

PARTS

LIST

PCS!.6-1

PCB2.6-1

PCB3.6-2

PCB4.6-7

PCB6.6-10

ASSEMBLY

7.6-11

SECTION

GLOSSARY

pRopteet-i'

Section

Mechanical

Procedures

1-0

GENERAL

This

section

shows

how

remove

the

Prophet's

main

assemblies.

Not

all

the

procedures

given

here

should

necessary

any

one

time.

For

most

service

situations

you

will

only

need

separate

the

top

and

bottom

panel

assemblies

and

arrange

them

shown

Figure

1-0.

This

configuration,

discussed

paragraph

1-2,

allows

access

all

trimmers

PCB

VOICE

BOARD

(Figure

7-7).

For

extensive

service

you

may

have

"swingout"

completely

remove

PCB

Procedures

below

show

how

either,

also,

how

remove

the

remaining

assemblies:

PCB

COMPUTER

BOARD.

PCB

LEFT

and

PCB

RIGHT

CONTROL

PANELS.

PCB

POWER

SUPPLY

BOARD

(PSB),

and

the

KEYBOARD

(KBD).

Generally,

each

procedure

gives

disassembly

removal

instructions

only.

assumed

that

re¬

placement

procedures

are

just

the

reverse.

Sections

2-5

this

manual

assume

that

you

are

familiar

with

the

Prophet's

mechanical

design

covered

this

section.

1-1

PRECAUTIONS

Observe

the

following

precautions

when

working

the

Prophet:

•

prevent

damage

the

top

panel,

keyboarder

woodwork,

use

carpetted

similarly-covered

work

surface

when

opening

the

cabinet.

•

Set

S701,

power

switch,

OFF,

and

check

S702,115/230V,

the

back

panel

units

184

and

above

before

connecting

power

outlet.

•

Never

switch

line

voltage

with

instrument

power

on.

•

Trimming

and

tuning

must,

course,

performed

with

power

on.

So,

avoid

the

power

supply

primary

circuitry,

which

conducts

lethal

voltages.

•

Switch

power

off

before

disconnecting

connecting

any

internal

circuitry,

removing

in¬

stalling

PCBs.

•

not

bend

strain

the

PCBs.

Otherwise

may

cause

tiny

breaks

the

printed

circuit

traces

which

will

extremely

difficult

find.

•

replace

soldered

components,

switch

power

off.

remove

the

PCB

completely

from

the

instru¬

ment

and

desolder

from

both

sides.

Use

vacuum

syringe

DIP

desolderer.

Don't

overheat

the

pads.

WORK

CAREFULLY.

•

Remember

that

service

position,

the

top

panel

assembly

balances

its

rear

edges.

Don’t

upset

this

balance

pushing

too

hard

when

trimming.

1-1

TOP

■

'PANEL

ASSEMBLY

CONTROL

PANEL

BACK.

PANEL

BOTTOM

—

PANEL

ASSEMBLY

J709/P402

PCB6

WARNING

LETHAL

VOLTAGE

PRESENT

WHEN

INSTRUMENT

Figure

1-0

Service

Position

••

•;

TL-:;

ttSJflMWi

PCB

COMPUTER

BOARD

W703

PCB

3/4

INTERFACE

PCB

VOICE

BOARD

BACK

VOICE

PANEL

POWER

CABLE

1-2

SERVICE

POSITION

set

the

Prophet

for

service

first

switch

power

off

and

turn

instrument

over

expose

bottom

panel.

Figure

1-0

identifies

(•)

screw

hole

locations

around

the

per

imeter

the

bottom

panel.

Remove

eleven

bottom

panel

screws.

Holding

top

and

bottom

panel

assemblies

together,

turn

the

Prophet

right-side-up

again.

Remove

four

screws

(•)

along

the

top

edge

the

back

panel.

Slowly

slide

the

top

panel

assembly

forward

—

about

six

inches

—

when

raised,

the

control

panel

knobs

will

dear

the

power

supply

capacitors.

Raise

the

top

panel

assembly

service

position

shown

Figures

1-0

and

1-1.

For

best

stability

both

top

panel

side

back

edges

should

rest

the

bottom

panel.

The

top

panel

upper

edge

rests

cable

from

the

back

panel.

This

normal;

but

small

(half-inch)

prop

may

added

support

the

top

panel

edge,

and

perhaps

improve

stability.

WARNING

LETHAL

VOLTAGE

PRESENT

THE

POWER

SUPPLY

PRIMARY

CIRCUITRY.

CAREFUL.

The

instrument

can

operate

normally

this

position.

shown

Figure

7-7,

PCB

completely

accessible

for

trimming

(see

Section

4).

Figure

1-1

Service

Position

1-3

PCB

VOICE

BOARD

SWINGOUT

REMOVAL

Although

most

trimmers

are

accessible

when

the

Prophet

opened,

PCB

may

swung

out

access

PCB

trimmers

which

are

otherwise

concealed.

For

this

setup,

switch

power

off.

remove

five

screws

identified

(•)

Figure

7-7,

and

position

PCB

shown

Figure

7-2.

not

strain

the

audio

output

cable

which

connects

the

back

panel.

Power

may

switched

back

this

con¬

figuration.

remove

PCB

completely,

switch

power

off

and

disconnect

voice

power

cable

PCB

(Figure

7-7).

Also

remove

W703.

with

gentle

“see-saw”

motion

P303.

Then

detach

audio

output

cable

quick-disconnects

J709/P402

back

panel

1701

AUDIO

OUT

(Figure

7-0).

When

reconnecting

voice

power

cable,

sure

tabs

interlock.

PCB

RIGHT

CONTROL

PANEL

PCB

TRIMMERS

AUDIO

OUTPUT

CABLE

Figure

1-2

PCB

Swingout

1-4

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