sequential-circuits Sequential Circuits Multitrack SCI-multitrak-service-manual

SEQUENTIAL

Publications

Department

Publication

MULTI-TRAK

MODEL

SYNTHESIZER/SEQUENCER

615

//:

TM615A

Issued:

April,

1985

TECHNICAL

by

Chet

and

Stanley

MANUAL

Wood

Jungleib

Sequential

POSTBUS

3640

Netherlands

16

AA

Mijdrecht

02979-6211

TELEX:

12721

SQNTL

NL

Wine

1572

Park

San

Jose,

(408)265-2008

Email:

Prophet™,

are

use{*

Sequential™,

trademarks

^y

Wine

ALL

RIGHTS

www.

WineCountrySequendaLcom

Country

sales@winecountrysequential.com

Productions,

Crest

Ct,

Ste.#5O5

California

of

Country

under

95118

*

FAX

266-6591

&

Sequential

Yamaha

Productions,

license.

Inc.

USA

Circuits™

Corporation

Inc.

MULTI-TRAK

MODEL

615

%

1

TECHNICAL

by

Chet

Manual

Issued:

SEQUENTIAL

All

April,

by

rights

MANUAL

Wood

No.

and

TM615A

1985

reserved.

Stanley 3ungleib

ii

Table

of

Contents

TOPIC

SECTION 1 GENERAL

Overview

Digital

Inputs

Generating

Outputs

DESCRIPTION

circuitry

control

signals

Tuning

Synthesizer

Audio

circuitry

Figure

circuitry

1:

Abstract

schematic

SECTION 2 SYSTEM/CHASSIS

SECTION

3

Abnormal

Resetting

Initializing

Updates

[vi€(jn<jHii(jcil

Board

Parts

PCB

1

Schematics

Sheet

Designator

Parts

Integrated

Passive

Non-designated

power-on

the

sequencer

the

ui2>ci;>5diiLJiy/rcds^cii

extender

list/functional

for

A

B

C

map,

list/functional

circuits

components

indications

pitch

description

PCBs 1 and

PCB

description

components

wheel

2

1

2

rtrti

(PCB

1)

PAGE

1

2

3

7

-8-

9

10

15

16

17

18

19

20

21

SECTION

TM615A

PCB

2

Keyboard

Parts

Integrated

Passive

Non-designated

scanner

list/functional

components

reset

problem

description

circuits

components

23

34

35

SECTION 5 PCB

Schematics

Designator

DAC

Audio

Parts

3

for

PCB

3

Sheet

D

E

map,

PCB

trim

Figure

Integrated

Passive

Non-designated

2:

Trimmer

out

field

update

3:

Silkscreen

4:

Component

5:

Solder

list/functional

side

description

circuits

Figure

6:

3394

components

component

3

and

test

side

traces

block

diagram

point

traces

locations

39

40

41

42

43

44

45

46

47

51

59

63

TM615A

IV

SECTION

Overview

The

controlled

chip1

Included

microcomputer,

sequencer,

1

615

("MULTI-TRAK")

hybrid

voices are

GENERAL

(digital

controlled

are a velocity-sensitive

a

switch

MIDI

computer

DESCRIPTION

from

plus

Sequential

analog)

synthesizer.

by a Z-80A

keyboard

panel

interface,

with

LED

and

multiple

is a polyphonic

Six

microprocessor

scanned

displays,

audio

voltage-

fvoice-on-a-

system.

by a 6801

multi-timbral

outputs.

Note:

Instruction

and

The

rev

performance.

should

onto

volatile

are

To

the

component

rev

instrument.

While

helpful

Digital

For

operation

Card

MIDIGUIDE

instrument

B,

has

be

updated.

the

boards,

memory

contained

determine

circuit

B,

boards.

side

so

any

reading

to

refer

circuitry

(CN615-1),

(MG615).

has

several

Early

chips.

in a separate

which

silkscreen.

mix

the

to

has a redesigned

the

information,

been produced

modifications

rev

Bfs

may

Rev

C,

in

Notes

document.

rev

of

the

Each

board

Rev A boards

of

rev A and B boards

following

abstract

see

Controls

addition

Rev C schematics

instrument

has a rev

general

schematic,

and

in

to

not

have

PCB

the

Operation

Indicators

two

basic

the

all

to

incorporating

2,

which

you

letter

are

circuit

page

versions.

PC

boards

the

mods

uses

and

are

working

clearly

electrically

can

be used

description,

5.

Manual

Card

designator

marked

(CM615),

(CN615-2),

The

first,

to

improve

installed,

these

different

on,

the

in a rev

it

and

mods

non-

map

look

on

the

same

may

at

as

B

be

The

Z-80A

control

analog

interface

DAC

and

signal

three

they

TM615A

envelope

are

microprocessor

inputs,

synthesizer

between

demultiplexers.

generators

generated

(CPU)

generates

circuitry,

the

for

generators.

in

and

sums

and

CPU

each

software

and

Also

voice:

Although

by

is

the

heart

control

checks

the

synthesizer

associated

a

low

frequency

functionally

the

CPU.

of the

signalsf

the

oscillator

with

615.

It

accepts

sends

is

the

oscillator

part

them

primarily

CPU

of

to

tuning.

(LFO)

the

The

via

are

four

and

voices,

the

Inputs

The

CPU

MIDI

checks

occurs.

see

if

respond

separate

events

is

interface,

the

The

any

have

immediately.

from

as

it

has

itself

keyboard,

switches

controlled

and

sequencer.

and

pots

changed.

MIDI

And

the

CPU,

been

advances

programmed.

by

the

keyboard,

The

keyboard

interrupts

are

inputs

the

sequencer,

the

CPU

periodically

interrupt

at

precise

front

panel

scanner

when a key

checked

the

through

intervals

by

CPU,

forcing

physically

and

switches,

constantly

event

polling

to

it

to

not

initiates

Generating

When

sending

key

is

control

Between

must

advance

into

other

with

minimum

programmed

interrupted,

Outputs

All

the

outputs:

The

voices are

by

the

control

milliseconds.

the

DAC

the

demultiplexer

sample/hold

the

path

the

updated.

control

an

input

to

the voices

pressed, a voice

voltage

events,

control

to

the

control

the

voices,

DAC,

demultiplexers,

voltage

The

one

signals

event

must

be

also,

each

envelope,

signals.

overhead

interrupt

CPU

signals

the

controlled

inputs,

CPU

at a time,

for

capacitor

to

that

capacitor

cap

selected,

This

takes

happens,

or

using

must

be

calculated

initiated,

the

CPU

Sequencer

by

the

synchronizes

the

CPU

LEDs,

by

and

sends

and

that

to

the

and

two

the

CPU

to

control

be

assigned

and

etc.

is

busy.

LFO,

means

CPU

and

glide,

timing

of

an

at

the

the internal

generates

the

sequencer,

48

control

and

sample/holds.

they

data

after

voltage

DAC

the

so

forth,

to

three

voltages,

must

representing

allowing

and

voltage,

milliseconds.

changes

itself.

to

play

corrected

Every

and

is

outboard

sequencer

must

and

all

be

the

For

instance,

it,

for

seven

add

the

handled

counter,

be

applied

MIDI.

which

Every

updated

voice

required

the

DAC

voice.

the

number

all

48

to

After

demultiplexer

is

sent

sample/holds

signals

the

tuning

milliseconds

latest

by

clock.

are

every

voltages

settle,

charging

it

is

when

frequency

the

which

a

errors,

it

value

CPU

is

When

to

various

generated

has

eight

seven

to

opens

the

opens

to

the

DAC,

have

In

contrast,

separated

for a few

illusion

Finally,

MIDI,

and,

the

into

milliseconds

of a steady

most

input

in

record

TM615A

LEDs

several

are

multiplexed

while

display.

events

mode,

quite

are

simple

the

relayed

recorded

to

control.

banks,

others

each

are

to

the

in

the

Panel

bank

off.

being

This

outside

sequencer

LEDs

turned

creates

world

memory.

are

on

the

through

Tuning

Due

to

temperature

in

the

615

must

the

frequency

required

use

Then,

voices1

In

preparation

enable

opened

voice

voltage

DAC.

not

time,

played,

than a C

the

second,

occur

for

it

the

tuning

after

every

envelopes

switch, a sawtooth

for

the

is

tuned

that

was

If

the

measured

correct,

until

octave.

during

the

it

the

voltage

is

played,

The

and

Is

the

drift

and

be

corrected

of

each

to

play

corrections

30

fully

for

tuning,

voice

at

seven

last

voltage

is

in

tune.

required

its

entire

fully

process.

oscillator

in

tune.

established

seconds

decayed),

the

wave

to

be

tuned,

Cfs

over

known

control

lnterruptlble,

to

frequency

is

incremented

This

to

tuning

component

to

remain

When

of

"standby11

the

audio

selected,

the

produce

is

result

produce

voltage

process

should a keystroke

aging,

in

tune.

and

determines

power

is

the

last

first

time

615

tunes

output

and

other

range

is

the

of

the

one

shut

voices

that C is

correct,

is

stored,

is

the

or

decremented

so

it

is

known.

found

for a voice

by

the

analog

The

applied,

time

(power

oscillators

CPU

the

measures

correction

the

voices

power

was

on

but

on.

voice.

off

by

the

audio

filter

oscillator.

applied

next C is

when

interpolating

and

amplifier

disabled.

First,

through

tuned.

one

this C is

If a note

takes

or

MIDI

The

the

step

at

later

other

within

about

inpux

all

If

a

Yi

If a voice

cannot

most

zeroed.

SCI

Combo

it

is

higher

the

Synthesizer

The

analog

chips

voices,

counters

Since

synthesis

is

so

far

bring

it

in,

significant

The

resulting

Chip

than

desired,

most

voltage

(described

and a comparator

located

all

is

significant

is

determined.

circuitry

synthesizer

under

on

controls

possible

out

of

tune

successive

bit

(MSB)

oscillator

and

the

U315

U220

for

with

of

result

the

bit

portion

in

for

combo

each

the

615.

that a few

approximation

the

DAC

frequency

compared

MSB

is

reset,

is

set, a trial

of

the

Section

feeding

chip.

voice

are

increments

is

set

is

then

to

the

otherwise

made,

615

consists

3), a noise

back

audio

separate,

or

decrements

used.

high

desired

generator

To

begin,

and

all

measured

by

frequency.

it

is

set.

and

so

on

until

of

the

six

for

signals

true

to

the

multi-timbral

others

all

the

U220

If

Then,

the

voice

six

tune

TM615A

Audio

circuitry

Audio

buffers,

The

during

brought

is

The

controlled

If

circuitry

and

audio

the

out

cut

off

from

chorus

•

Pre-emphasis

•

Anti-aliasing

•

Delay

•

Smoothing

•

De-emphasis

•

Phase

•

Output

delay

falls

the

chorus

switches tune

routine,

separately.

the

circuit

line

filter

inversion

mixing,

line

is

driven

by a sine-wave

the

chorus

is

switched

under

and

mixed

comprises

filter

for

two

main

section.

buffers

and

If

an

output.

provide

for

the

individual

the

following

'dry + effect1

by a high-frequency

LFO,

off,

whose

Mix A and B outputs

categories:

for

voices

to

voice

stages:

and

fdry -effect1

depth

audio

the

audio

be

mixed

output

switches

to

is

used,

signals

sampling

and

clock

rate

are

identical.

and

be

muted

together

its

which

or

signal

is

adjustable.

TM615A

FOOT8WITCH>—

|_BACI

PANEL

SWfTCKS

KEYBOARD

MATRIX

(FR8T

MAKE)

(LAST

I

MAKE)

111

III

RE3ET

SWITCH

DATA BUSS

UT6B/H

■+•-=

KEY

WT

DATA

4/3

4603

REVBaTa

I

U(RC5ET

UT

LEDSDI

BUFFEB

LED

mse

KPUT

,

TAPE

ICOMPABATDB

BUFFH

2/3

4603

DfVmER

CLOCK

POWEB

SUPPLY

•»-6VD

+5VA

-6.6VA

NQWOUTILE

tniitl

LOfitt

3/4

HC02

WTEBBUFTLOBC

KCOO/

HC02

ftbWfett

ON

(RESET)

AUDIO

ENABLE

DAC

LATCH

2X

14

DAC

AD

7641

TUNECOflPARATn

TYPICAL

FlfE

OTira

AUDIO

SWITCH

IOCB

TB*aUM0OOOTTOT

RATS

OUTPUT

HLTEB/Dl-UMAStt

TBACX

Aura

DNMFFBT,

SECTION

2

SYSTEM/CHASSIS

Abnormal

When

read

also

indicated

there

sequences

troubleshoot

associated

Resetting

If

the

operational

sequencer.

Program

CAUTION:

Initializing

'power-on1

power

'00'

light.

is

first

and

one

If

instead,

by a slow

may

be a problem

and

the non-volatile

circuitry.

the

sequencer

error,

Switch

Record.

This

procedure

the

pitch

of

stacks

does not

first

on

indications

switched

the

Seq

the

count

on

on,

the

LEDs

should

instrument

from 1 to 6

with

non-volatile

tape

(see

power

operate,

save

SEQUENCER

wheel

the

sequences

Record,

destroys

all

Value/Program

light.

goes

in

the

Chorus

through a tune

Value/Program

memory.

the

operation

supply,

and

sequences

memory

you

are

to

tape,

then

in

display

On/Off

Save

programs,

manual),

chips

not

making

then

hold

Seq

memory.

should

may

routine,

display,

then

and

an

reset

and

the

press

If

recorded

wheel

Record

Updates

Three

repaired

is

1.

sequences

in,

moved,

and

press

conditions

under

Hum

procedure.

2.

Occasionally,

not

work

back

on.

3.

The

various

star

lockwasher

3.

(Alternatively,

a

small

amount

play

back

or

voices

warranty

or

(S/N

until a certain

See

pins

symptoms.

go

the

pitch

3,

then

exist

noise

in

less

when

page

20.

of

P202

To

between

out

wheel

move

early

if a customer

the

than

power

(S/N

can

correct

with a pair

from

the

in a different

of

tune

with

each

may

need

the

wheel

production

audio

and

complains:

output.

68*.)

is

first

turned

key

is

hit

or

less

than

approximately

short

each

length

to

traces

this

problem,

of

the

two

of

diagonal

of

each

tuning

other

initializing.

return

models

See

on,

power

than

they

when

Hold

it

to

center.

which

p.

*3

for

the

keyboard

is

turned

the

Program

should

off

100.)

near

add a 4-^0

4-40

cutters,

of

the

J302,

standoffs

causing

external

and

carefully

pins

of

P202.)

were

pitch

be

update

does

and

PCB

trim

TM615A

Mechanical

1.

Turn

connector.

2.

Of

loosen

3.

Remove

bottom

4.

Remove

keyboard

position

the

panel.

5.

Power

6.

To

power

PCB 3 by

PCB

2.

holding

disassembly

off

power

the

five

the

remaining

four

panel.

the

cable

without

Place

may

be

gain

access

supply

Finally,

it

cable

removing

to

PCB

and

remove

screws

top

so

disconnecting

it

reapplied

gently

2.

on

each

three.

on

panel

that

from

the

on a protective

and

to

the

computer

that runs

the 5 6-32

pull

side

the

rear,

the

panel

the

pad.

the

unit

from

screws

PCB 3 out,

power

cord

panel,

remove

holding

chassis.

may

be

propped

cable.

Be

tested

board

PCB 1 to

IPCB

and 2 4-*0

disengaging

from

the

top

There

should

up

careful

in

this

PCB

not

position.

2j,

first

3,

screws

the

rear

panel

top

two

and

panel

to

be

enough

the

in a working

to

scratch

unplug

then

holding

connectors

trie

remove

it

to

7.

Boards 1 and 2 must

from

the 5 6-32

With a %"

PCB

Mechanical

1.

2.

40

standoffs

PCB

CAUTION;

3.

plugging

standoffs

4.

in.

work,

the

top

screws

nut

2.

reassembly

Reverse

When

M-F

3.

When

order

installing

threaded

into

Do

installing

it

in

and

Test

unit

to

Test

the

Master

the

PCB 3 to

and

holding

driver,

of

standoffs

the

not

over-tighten

to

PCB

make

be

removed

remove

disassembly.

PCB 2 to

holes

PCB

3.

Install

sure

Volume

PCB 2 connectors

the

PCB 1 and

remove

the

into

that

3,

line

2.

Be

sure

the 2 4-40

the

keyboard

and Master

together.

pitch/mod

the k 6-32

the 5 M-F

top

panel,

the

smaller

match

the

up

standoffs!

up

the

to

install

screws

and

Tune

may

First,

wheel

threaded

be

holes,

with

connectors

pull

cable.

screws

careful

the

holding

standoffs

to

and

mounting

carefully

lockwashers

into

the

smaller

wheels

controls.

not

have

been

If

the

knobs

Then

put

the 3 6-32

off

remove

PCB

holding

the 2 4-

holes

before

between

all

holes.

been

plugged

they

do

not

lined

up.

2.

in

5.

Tighten

TM615A

all

screws.

Board

extender

Ordinarily,

3

removed*

operating

board

consists of a PCB

cables.

troubleshooting

However,

while

extender

The

probing

kit,

cables

of

PCB 1 or

in a few

test

SCI

part

that

can

themselves

cases,

points

number

be

used

are

PCB 2 can

PCB 3 must

on

PCB

2.

PC-0615-BS,

with

ordinary

not

supplied

by

be

done

with

PCB

be

installed

For

this

purpose,

is

available.

double-row

Sequential.

The

header

and

a

kit

TM615A

DESIGNATOR

SCI

PART//

DESCRIPTION

Wl

PARTS

S-090

870

E-173

M-016

M-071

M-199

M-357

M-383

M-420

M-438

M-475

M-*81

M-498

M-505

M-506

M-507

LIST/FUNCTIONAL

PASSIVE

NON-DESIGNATED

COMPONENTS

DESCRIPTION

15VAC

100K

Function:

5

PANASONIC

Function:

61.5

9"

RECEPTACLE

LARGE

1-54A

1-KA

LINEAR

OCTAVE

PARTS

l*lAcl\jRY

RIBBON

RUBBER

6-32 X 1/4"

4-40 X 1/4"

BLACK

#4

KNOB

STAR

m X 5/8"

HD

PHIL

RED

1.75"X

//8xl/4

ACETATE

10

BLACK

10-32 x 3/8

6-32

STANDOFF

HD

M5-5

SCREW

MALE/FEMALE

OX

5/8"

X

3/8"

PHIL

(METRIC)

CT

WALL

CT

WALL

MOUNT

MOUNT-220V

POTENTIOMETER

Pitch,

mod

wheels

WEIGHTED

SK7020

Keyboard

PROGRAM

CABLE

FEET

PAN

HD

BLACK

.250 X .156

WASHER

BLACK

EXT

SHEETMETAL

PHIL

PAN

TAPE

W/FEMALE

MS

HD

TOOTH

WINDOW

ml

PAN

HEAD

BLK

PAN

HD

PHIL

THREADED

BLACK

STANDOFF

SHEETMETAL

CHEEZE

110V

VELOCITY,

.1"

PHIL

PAN

1.25"X

SMS

5/8"

HEX

PAN

HEAD

TM615A

MW0615-1

MW0615-2

PC0615-BS

PW0620-1

PW0620-2

Z-339

615

TOP

0615

BOTTOM

PCB

cables)

(For

3

service

PLASTIC

HALF

SUBASSEMBLY

10

PANEL

to

PCB

use

only)

END

CAP

END

CAP

CUT

2

extender

LEFT

RIGHT

MOD

kit

(less

WHEEL

DESIGNATOR

SCI

PART//

3-056

DESCRIPTION

5

HOUSING

M-070

M-090

M-192

M-384

M-397

M-485

M-497

MW0000-2

PW0000-1

Function:

Pitch

and

mod

6-32 X 1/2"

6-32

HEX

#8

BLACK

1/8" X 1/8"

6-32 X 7/8"

PITCH

#6

MOD

MOLDED

wheels.

WHEEL

INTERNAL

WHEEL

Has

SET

NUT

FLAT

ALUM

PAN

BRACKET

HALF

set

screw.

SCREW

WASHER

RIVET

HD

PHIL

SNAP

TOOTH

CUT

BUTTON

LOCK

MOD

WASHER

1/HT

WHEEL

TM615A

11

SECTION

3

BOARD

1

TM615A

13

3051

Nl

SAN

JOSE.CA.

SCHEMATIC

DIAGRAM

HRST

8S134

ST.

ADbRESS

buss

INTERRUPT

CLOCK

SWITCH

DRIVER

B

J\\

I

niscouT

M

MISC.

OUTPUT

LATCH

1.9

KHz

CLOCK

DIVIDER

ASS

INTERRUPT

REQUEST

LATCH

MISC.

INPUT

BUFFER

3051

N.

SAN

JOSE.CA.

SCHEMATIC

DIAGRAM

RR8T

ST.

85134

KEYBOARD

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CONTACT

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NON-VOLATILE

RtSET

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3051

SAN

JOSE.CA.

SCHEMATIC

DIAGRAM

N.

FRST

ST.

85134

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SAN

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fr^vaB-z

DESIGNATOR

FUNCTION

SCI

PART#

DESCRIPTION

U101

U102

PARTS

+5V

analog

C-l,

regulator,

Power

negative

-6.5V

Input

from

change

filters

LIST/FUNCTIONAL

INTEGRATED

regulator

sheet

C.

Regulates

because

comes

from

regulator

analog

is

S101.

the

regulator

n v t

"i-Q'""ii-i

the

rectified

Divider

the

output

output.

DESCRIPTION

Z-340

CIRCUITS

1-428

the

+5V

Analog

it

is

the

basis

+V

UNREG.

powers-up

and

RIO*/105

of

this

first.

■»"

"■■

filtered

(with

regulator

R103

C103

"i

filter

615

ASSEMBLED

780-05

of

the

supply.

DAC

This

reference

prevents

stabilizes

the

LM7905/79M05

1A

voltage

j

■■■— — ■■—■

(by

D105-8

C106)

(normally

and

bias

-5V) to

1

BOARD,

is

a

+/-

1%

voltage.

latch-up

if

the

supply.

-5V

regulator

»p

*~-

——-— y

C102)

the

15

VAC

reference

-6.5V.

C104

-

to

U103

+15V

analog

D-l,

sheet

the

DAC.

regulator

C.

Regulates

Input

is

from

1-405

the

+15v

Analog

voltage

doubier

78L15

supply,

D101/2

which

and

15V

regulator

goes

only

C105,7.

to

TM615A

20

DESCRIPTION

PASSIVE

COMPONENTS

3300

16V

1000

35V

47

35V

ELECT

2.2

10V

47

35V

ELECT

.1

50V

DECOUPLER

100V

1N914

100V

5

DIN

LARGE

5

10K

150

301

86.6

20K

IK

1AMP

240

CONN

/4"

MONO

LOCKING

LINEAR,

OHM

1/4W

ELECT

20%

TANT

1N4002

DEGREE

PHONE

RED

TI

REV

1/4W

1/4 W 1%

5%

RADIAL

MONO

RT

3ACK

PC

5%

1%

RADIAL

ANG

PC

LOW

MNT

S101

S102-16

S-092

S-089

NON-DESIGNATED

S-093

S-094

Z-338

3-084

P-031

PC0615-1

Rev B uses a jumper

Rev C has

no

mods.

to

DPDT

ROCKER

Function:

OMRON

(used

with

COMPONENTS

OMRON

POWER

7

LOCKING

POLARIZING

0615 1 BOARD

connect

two

RT

KEY

GRAY

ANGLE

SWITCH

Power

cap,

On/off

SWITCH

below)

SWITCH

ORANGE

SUPPLY

HARNESS

HOUSING

PINS

grounds

on

PC

switch

CAP

SWITCH

CAP

board.

MOUNT

TM615A

21

SECTION

BOARD

2

DESIGNATOR

U201

KEYBOARD

Units

with

unreliable

turned

or

until

To

correct

electrolytic,

FUNCTION

PARTS

+5V

digital

C-l,

circuitry.

sheet

supplied

filtered

5.7V,

digital

off,

on,

which

nominal,

supply,

+Vnv

D210

would

SCANNER

serial

number

keyboard

on,

their

power

keyboards

is

turned

this

from

PCB

LIST/FUNCTIONAL

regulator

C.

U201

Its

input

through

by

C101.

J101

D205

which

and

by

is

supplied

prevents

be

lithium

dangerous.

RESET

scanner

off

problem,

2.

PROBLEM

less

than

reset.

do

not

and

back

simply

SCI

PART

DESCRIPTION

Z-341

regulates

is

+V

UNREG,

and

switch

raises

is

D209

instead

the

dropped

for

+Vnv

by

BT201

battery

100

(approximately)

Sometimes,

work

until a particular

on.

remove

//

the

+5V

which

S101,

output

to

BT201

voltage

5V by

(V

non-volatile).

through

from

when

C203,

DESCRIPTION

615

ASSEMBLED

7805

supply

comes

rectified

of

D208

D210.

attempting

power

10

2

for

the

from

for

the

by

D105-8

the

regulator

+Vd,

When

have

key

BOARD,

is

first

is

hit

uf

16V

an

digital

15VAC

and

the

5V

power

to

charge,

to

is

U202

TM615A

+V

UNREG

Switch

C-l,

sheet

RESET

octal buss

the

demultiplexer.

lines

remainder

activate

closed,

data

buss

connected

also

driver

B.

(pin

2),

A5-A7

one

the

high

buffer.

to

each

supplies

Normally,

placing

encode

go

of

the

is

coupled

D211-17

other

U309

Q7

the

When

strobed

the

low.

This

columns

to

if

more

23

(C-4,

1-275

of

chip

output

high

the

prevent

sheet

this

latch

in a mode

by

-SWOUT

bit

output

of

the

switch

corresponding

the

than

one

E).

4099

latch

is

high,

where

it

(from

(Q0-Q6)

goes

which

through

matrix.

outputs

switch

of

U202

is

pressed.

addressable

which

operates

activates

as

U204),

is

address

to

go

high,

a diode

If a switch

of

U203,

Switch

from

being

an

to

is

U203

Switch

D-2,

which

the

decoded

One

by

overriding

down

column,

input

sheet

are

switch

of

U202,

resistors

buffer

B.

The

combined

array

by

U204

the

seven

the high

the

then,

is

low

R203

1-216

4503

tri-state

(pin 1 tied

on

to

the

data

and

applied

columns

propagates

normally

and

placed

on

to

of

kept

R219-23.

the

buffer

to

buss.

U203

the

switch

through

data

is

15)

The

as

-SWIN.

any

on

the

The

pattern

buss

while

4503

buffer

divided

to

command

array

closed

input

into

gate

information

from

having

switch

by

one

of

switches

-SWIN

hex

two

been

is

active.

3-state

sections,

the

CPU

set

on

the

of

the

for

from

is

high

row,

pull

that

U204

U205-3f-6

U203

footswitch

opened

I/O

A-3,

output

A*

present

A2).

Interrupt

Metronome

A-2,

(Metronome

holding

C205

logic

charges

remains

2),

also

serves as

line

is

or

closed,

chip

select

sheet

latches,

is

high,

on

The

Acknowledge

sheet

decoder

A,

Decodes

and

-IOREQ

the

output

Ml

signal

one-shot

A. A low

output)

-6

high

gradually

threshold,

through

low,

keeping a high

until

the

as

discharges

U205-3

CS

the

footswitch

normally

transition

pulled

is

1-253

I/O

chip

selects

stimulates

is

low,

corresponding

is

included

cycle

pulse

to

go

high.

U204-9

the

and

-Ml

to

of

the

1-26*

(CS)

Pin 3 (and

returns

through

goes

R204,

high,

returning

on

-3

and

pulse.

input.

up

smoothed

by

R202.

Plugged

When

by

R203

74HC138

to

various

metronome

is

not

to

the

(see

active,

address

prevent a chip

Z-80A.

7*HC00

nand

from

to

R204,

forcing

-1

-4

U204-9

-4)

immediately

its

normally

and

when

-6 to

to

its

equilibrium

(therefore

in

to

J102,

the

switch

and

C204.

input

buffers

U205-3).

an

active

on

pins

1-3

select

during

quad

causes

goes

high

condition.

it

crosses

return

a

low

on

low.

high.

-6

the

is

and

When

low

is

(A0-

the

2-in

U205-6

low,

the

C204

-2

and

-

U205-8

U205-11

U206-9

TM615A

Not

used

Interrupt

B^-l,

Divide-by-2

D-4,

MHz

logic

sheet

square

B.

See U235-1.

A. A •■•T"

wave.

1-264

1-252

flip-flop

which

74HC00

nand

74HC00

nand

74HC74

flip-flop

converts

the 8 MHz

quad

Dual

MO1

clock

to a 4-

2-in

U206-6

Interrupt

A2,

interrupt

U210-7,

U206-6

U235-1).

an

I/O

signal

low

request

sheet

B.

The

mask

programmable

to a high

When

read

with

from

the

state.

latch 1-252

-Q

output

(U215-11)

interrupt

state,

the

A3

SCI

placing

Z-80A

low

combo

(-6)

is

low, a -CARRY

clock,

an

acknowledges

and

A2

chip

(U220-33),

74HC74

flip-flop

is

normally

inverted

interrupt

the

high,

which

low.

by

request

interrupt,

activates

presetting

Dual'D'

If

the

OUT

signal

U207-4,

on

U235-3

it

the

U206-6

counter

from

strobes

(see

executes

-IORD

to

the

U207-2

U207-4

U207-6

U207-8

U207-10

Inverter

A-4,

sheet

Inverter

A2,

sheet

Inverter

A3,

sheet

Inverter

Not

used.

Inverter

C-4,

sheet

A.

B.

See

B.

See

A.

Inverts

Buffers

the

U206-6.

U209-1.

the

1-249

-Ml

signal

1-249

output

of

from

the

clock

oscillator

74HC04

CPU.

74HC04

hex

See

hex

U207-12.

inverter

U204

hex

inverter

hex

inverter

hex

inverter

U207-12

U208

U209/10

TM615A

Inverter

D-4,

sheet

as a simple

1.95

kHz

B3,

sheet

256

to

Prog,

B2,

interrupt

sheet

value

This

is

A.

RC

clock

B.

Divides

drive

by

the

B.

The

performing

decoded

1-249

Works

oscillator.

divider

clock

with

Y201 8 MHz

1-272

the

500

kHz

programmable

Z-80A

by

loads

an

I/O

U233-8

25

interrupt

1-276

the

write

and

U220

crystal,

from

SCI

clock.

counter

with

A4

and

to

provide

74HC04

R207/8,

4040

counter

combo

chip

(See

4029

with

the

A3

low

the

hex

inverter

and

C206/7

U220-19,

U209.)

desired

and

-IOWR

preset

A2

signal,

by

high.

U2L1/12

U213/14

U220-34.

U209/10.

complete, a carry

clocks

CPU.

clock.

(See

LED

C-*

df

LED

used

section

D3.

U20*-13, a decoded

data

column.

(for

applied

active,

cathode

column

targets

-IOWR

U209

U206-6

This

informs

passive

driver

and

D-4,

information

for

DO,

of

U214

The

latching

buss

at

This

the

others),

to

the

with a low

of

only

the

is

immediately

(if

"counter

components)

latches

sheet

and

latches

this

high

current

anodes

the

LED

stays

inverted

out

the

CPU

B.

U213

from

the

other

is

accomplished

Z-80

time

is

buffered

of

on

its

and a high

lit

for a few

by

U207-6

begins

signal

from

mask,"

that

1-227

and

U214

the

data

three

D4,

and

I/O

write

for

each

by

LED

limited

the

LEDs

output

continually

of

on

and

counting,

U210-7,

U215-11,

it

is

time

together

bus.

The

for

D5-D7.

the

other

on

command

signal.

LED

by

in

U217.

milliseconds,

lit

drivers

a 39

the

With

the

anode,

multiplexing

strobes

is

to

first

three

A

in

Q202

ohm

row.

the

and

when

inverted

low),

advance

4042

latch

section

Likewise,

sections

of

high

the

(for

resistor

One

this

low

the

then

the

data

buss

into

the

count

by

U207-*,

interrupting

the

sequencer

quad

latch

the

eight

of

U213

the

latch

-LEDOUT,

is

present

currently

DO)

and

in

U211,

of

the

columns

applied

LED

lights.

the

processor

LEDs.

is

the

rows

is

first

Dl-

from

on

the

active

U212

and

is

to

the

This

U215

Misc.

A-4,

-MISC

chorus

25,

program,

output

C209.

The

output

sheet

OUT

latch

B.

of

on/off

and

27).

stack

goes

through

The

output

fourth

output

U206-6.)

Latches

U204-11

switch

The

and

the

is

(U337-6)

third

sequence

voltage

appears

of

U215

1-227

first

strobed.

output

four

Its

and

the

(pin

dumps,

divider

on

J103,

is

the

To

4042

bits

of

first

two

audio

1)

clock

R209/10

Tape.

Counter

enable

is

the

put

and

Interrupt

quad

latch

the

data

outputs

buss

control

switches

tape

out,

sync

to

is

ac

coupled

mask.

when

the

(U32*,

used

tape.

for

This

by

(See

TM615A

26

DESIGNATOR

U216

FUNCTION

Tape

comparator

B-l,

sheet

which

(U229-12).

high.

supplied

signal

inverting

the

comparator

improves

B.

Converts

are

read

With

Divider

is

R211/12

to

the

referred

input

stability.

through

oscillations

SCI

1-301

ac-coupled

by

the

Z-80A

ho

input,

R218

provides

reference

to

the

output

input

same

R215. A positive

low.

during

bias

R217

slow

PART//

data

from

through

pulls

a

open

bias

voltage

(pin

2)

through

signal

provides

input

transitions,

DESCRIPTION

311

comparator

tape

into

digital

the

Misc.

collector

of

R214

hysteresis

and

on

input

output

2.5

volts

R216.

applied

the

input

to

discourage

and

The

C211

precision

pulses

buffer

7

which

is

input

to

the

drives

also

U217

U218

U219

LED

matrix

B-4,

sheet

LED

current.

LED

sink

B-4,

sheet

strobed

currently-active

ACIA

B-l,

sheet

Adaptor

form

for

to

the

CPU.

The

CPU

various

Chip.

low,

read,

RSEL,

data

edge

To

by

address

lines

of

sink

B.

Inverts

the

Normally,

latch

B.

Latches

by

miscellaneous

output

A.

U219

(ACIA)

transmission

converts

communicates

address

write

addressing

A0,

are

fEf.

lines,

or

read,

any

Al,

going

selects

the

steady,

and

ACIA

1-235

signal

only

the

is

Asynchronous

over

with

the

location

to

the

from

one

1-228

LED

output

high,

1-066

parallel

MIDI,

the

control

CPU

R/-W,

internal

actual

LED

output

sink

data

chip

the

rest

data

and

ACIA

sets

between

is

register.

data

MCU

sink

latch

is

active

from

select

are

low.

68A50

Communications

from

transfers

by

means

lines

set

from

A14

and

C000H

high;

Once

transfer

13(2003)

U218,

(low)

the

received

A15

it is

occurs

at a time.

hex

latch

data

-LED

SINK.

CPU

of

the

TJ220

SCI

high,

and

DFFFH.

low

the

address

on

and

sinks

buss

when

The

Interface

into

serial

MIDI

data

the

data

buss,

Combo

and

A13

To

to

write.

and

falling

TM615A

Once a byte

shifted

(pin

bits

DATA

output

5,

If

out

4).

Since

proceed

output

is

the

external

TXDATA

to

TXDATA,

at

is

low,

Q201

is

high,

be

transmitted

bit

by

the

TX

clock

31.25

applied

MIDI

kBaud—the

to

turns

no

on,

circuit,

current

27

has

been

bit,

one

bit

is

supplied

MIDI

the

base

of

forcing

and

back

flows.

placed

for

every

by

500

in

16

kHz

transmission

Q201

current

through

emitter

through

3202,

the

ACIA,

TX

clock

from

U220,

rate.

follower.

R228,

pin 4 and

it

pulses

the

The

TX

If

the

J202

R227.

is

DESIGNATOR

FUNCTION

SCI

PART//

DESCRIPTION

U220

Incoming

cable

of

the

referring

After a byte

-IREQ

the

CPU

Since

are

not

SCI

combo

C-3,

lliici

devices.

a

reset

ACIA,

The

AH

-MREQ,

a

memory

refresh

is

combined

MIDI

to a logic

ACIA.

goes

via

RS-232

used.

sheet

Ikj

It

pulse

and

decoding

and

A15

-RD

This

it

to

the

is

true,

-UINT

protocols

chip

A.

The

prOuUCC

also

for

synchronizes

function

together with

and

cycle

cycle,

which

with

data

is

converted

signal

by

U231

data

RX

completely

requesting

of

stream

clock

U220.

(pin

are not

1-602

combo

CTTTp

measures

the

-WR.

is

being

A14

chip

5CreJUt5

oscillator

CPU,

provides

the

ACIA

uses

inputs

If

-MREQ

requested.

is

not

used

and

A15

from a current

optoisolator,

is

converted

and

3).

received

non-maskable

applicable,

decodes

fur

interrupt

CPU

is

in

to

produce

or

completely

interrupt

-RTS,

SCI

the

CPU

IIic

memory

frequencies

fE'

and

500

(see

from

control

this

address

signals

active

(-RFSH

and

active

system.)

chip

selects.

loop

in

applied

to

parallel

transmitted,

service

-CTS,

combo

address

and

for

kHz

chip

and

lnput/OUXpux

tuning,

clocks

U118).

buss

signals

-IOREQ,

-RFSH

is

not

would

The

memory

the

MIDI

RXDATA

form

and

by

from

-DCD

control

provides

for

the

A0-A3,

-RFSH,

active,

indicate

a

request

If

A1*

and

A15

are

low,

still

low,

-RAM0

RAM1

combination

ACIA,

The

the

is

produce

-LATCH

The

produce

is

enabled.

U124.)

-IOREQ

Combo

active,

4-MHz

chip receives

-RD

chip

3.

the

programmable

from

-RESET

The

internally

These

buss

For

U221.

U235-10

input

TUNE

input

to

counters,

(D0-D7)

description

is

selected,

If

of

AH

and

input

system

of

and

selects

clock

500

kHz

interrupt

and

of

the

Z-80A.

is

driven

two

counters

in

turn,

and

the

address

of

the

-ROM0

both

A15

U220

-WR

is

an

-IOWR,

is

(pin

clock

is

fed

by

is

and

are

high,

high

isi

gated

-IOREQ

are

combined

-IORD,

brought

19)

ACIA

(U209/10).

through

U329-7

which

communicate

buss.

-INT

(pin

23)

selected.

if

A15

there

used by

with

signal.

in

clock

If

AH

is

high

is

no

other

A4

by

U233-8.

If

U220fs

logically

and

on

-LATCH 0 through

for

-RESET

U220-24,

comparator,

measure

with

and

oscillator

the

-NMI

(pin

is

high,

and

chip

logic

-IOREQ

with

18

and

the

ACIA

(pin

-RESOUT,

and

CPU

22)

and

AH

is

select.

to

select

If

A*

A0-A3

divided

and

25)

is

connected

frequency.

via

the

outputs,

A15

low,

-

(The

the

is

low,

input

to

the

comes

to

the

data

see

TM615A

28

DESIGNATOR

FUNCTION

SCI

PART//

DESCRIPTION

U221

CPU

C-4,

U119

execution

memory

control

command

(D0-D7)

chip

U204).

only

Interrupt

-INT

-KEYINT

signal

7-millisecond

Whon

13)

The

data

(See-KEYDATA,

sheet

MHz

clock

SCI

selects

-BUSAK,

for

(from

ancu/Prinp

to

determine

-KEYINT

ready.

A.

The

from

U206-9.

Combo

at

ROM

or

I/O

location

signals

external

or

take

-IOREQ,

it

during

-HALT,

factory

inputs

testing,

-INT

U235-1),

from

U230

U209/10

timeout

an

where

signal

The

CPU

Z-80A

Chip

location

devices

off.

the

and

Keyboard

interrupt

tells

then

U228/29-1.)

1-058

microprocessor

At

power

(-RESOUT)

0.

on

the

-RFSH,

to

-Ml

is

Z-80A

and

so

it

is

-NMI

is

the

on, a reset

that

The

CPU

address

either

used

buss

-MREQ,

place

to

protect

interrupt

-WAIT

pulled

are

up

important

combination

Processor,

Programmable

produced

the

by a timer

th*

rPI I pnlir

interrupt

the

CPU

reads

came

that

the

information

Z-80A

unit

(CPU)

pulse

causes

places

the

(A0-A15)

-RD,

data

against

runs

is

generated

CPU

the

address

and

on

the

spurious

acknowledge

not

used.

with

R229.

the

interrupt

in

U220

MISP

-BUSRQ

signals

of

COUNT

in

the

three

COMPLETE

clock,

SCI

Combo

1M

(rnn

from.

the

Keyboard

from

scanner

the

on a 4

by

to

begin

of

a

activates

-WR

data

to

buss

I/O

cycle

(see

is

used

system.

interrupts:

and

1H19

scanner.

a

Chip.

11,

has

The

COUNT

clock

countdown

(via

advances

programmable

interrupt.

separately

interrupts.

The 7 millisecond

be

done

and

LFOs

-NMI

where

applied

received a byte

for

All

"background

responding

milliseconds

comes

it

to

another

functions

COMPLETE

U206-6)

is

complete,

the

sequencer

interrupt

Provision

is

(U215-11),

interrupt

regularly,

and

from

is

synchronized

-NMI

byte.

loop11.

to

for

such

updating

U219-7

(pin

from

that

the 7 millisecond

background

MIDI

are

not

Typically

signal

used

the

to

clock,

made

so

the

paces

as

calculating

to

time

CPU,

the

for

CPU

from

the

sequencer

in

response

event,

interval

this

interrupt

can

those

CPU

the

sample/holds.

-IREQ

with

17).

It

or

done

the

processing

to

U220

the

system

occurs

has

on

when

finished

interrupts

CPU

spends

interrupt,

before

SCI

clock.

transmitting

interrupt

events.

to

then

presets

desired

to

prioritize

operations

value

Combo

From

U219

ACIA

are

accomplished

about

the

kYz

leaving

the

interrupt,

U209/10,

to

the

be

masked

the

which

for

envelopes

Chip

there

either

and

is

milliseconds

about

interrupt.

the

must

-UINT

it

is

has

ready

in

a

2)4

TM615A

29

DESIGNATOR

FUNCTION

SCI

PART//

DESCRIPTION

U222

U223-27

U22S/29

U228/29

pins

(11,13)

Operating

D-3,

and

data

U220

would

Non-volatile

D-1,-2,

firmware

sheet

A.

busses

by

pulling

SCI

save

and-3,

non-volatile

either

through

3-9

Data

B-4,

(through

the

Misc.

B-l,

I/O

are

COUNT

read

U232

buss

buffers

sheet

-KEYDATA

keyboard

input

sheet

chip

select

from

the

COMPLETE.

Contains

are

connected

-OE

low

Combo

power,

RAM

program,

(-OE)

C.

Chip.

this

sheet

A.

or

and

one

inese

sequence,

write

of

xn-staxe

from

scanner

(U230).

buffer

B.

These

ADC

tri-state

decoder

and

Z-106*

the

operating

to

(active)

through

Although

method

These R A

allows

1-0*3

Ms

and

(-WE),

the

OR

gates

1-216

U20<f-7)

1-216

buffers

U204.

tape

The

comparators,

firmware

the

CPU,

and

decoded

use of

provide

stack

the

-CE

use

of a slower

scratchpad

storage

chip

select

U233/34.

ire

enabled

when

signals

it

wants

are

enabled

gated

from

MULTI-TRAK

software

for

the

for

2-1

CPU.

CPU

-ROM0

the

output

chip

Address

reads

EPROM.

6116

LP-4

storage

for

the

Z-80A.

must

buffer

to

*503

buffer

by

on

-KEYINT,

be

hex

read

data

hex

-MISC

to

the

data

and

the

of

select

and

To

enabled

3-state

ttHA

from

3-state

IN

from

buss

from

U230

Keyboard

D-4,

microcomputer

function

closure

80A

velocity

-KEYINT

output

from

U230-39,

output

message

are

sent;

byte

another

The

column

Enable

scanner

sheet

CPU.

C.

The

with

is

to

scan

information

When

has

it

been

(pin 12,

port

3.

When

the

data

buss

SCI,

port

have

key

is

sent.

key

keyboard

at a time

decoded

and

interrupts

been

number

The

scanner

event

is

scanning

counter

the

detects

pulled

buffers

transferred.

of

1-612

keyboard

internal

dual-contact

to

key

on

that a key

calculated),

up

the

CPU

(U228/29),

the

scanner

the

and

velocity.

then

detected.

is

conducted

keyboard

U236

scanner

RAM

and

keyboard

off

and

has

it

interrupts

by

R2*H),

responds,

and

strobing

the

then

CPU

For a 'key

resumes

matrix

places

again,

For

'key

scanning

by

applying a high

using a clock

Masked

is a single-chip,

masked"

and

velocity

been

closed

places a byte

-KEYDATA

strobe

Wl,

is

the

until

all

on1

message,

off,'

just

by

from

68B01

8-bit

ROM.

convert

data

or

the

also

the

keyboard

advancing

U230-8

Its

the

for

the

opened

Z-80A

picked

byte

bytes

key

signal

(P20).

using

of

data

to

up

on

in

two

bytes

number

to

Column

Each

sole

(and

read

until

key

Z-

on

the

one

TM615A

30

DESIGNATOR

FUNCTION

key,

it

can

be

seen,

through

(pins

current

the

subtracted

of

the

internal

The

has

input

The

communicating

(U236-14)

negative

approximate 1 kHz

interruption

is

waiting

pulse

-KEYINT

responding

port 1 (pins

30-37).

When a closure

reading

outer

6801

used

keyboard

contact

from

key.

This

look-up

comes

the

1MHZ

to

4MHz

instead

is

should

pulses,

when a key

for

fh^

trains

indicates

or

the

(-KEYDATA).

has

of

an

of

the

present

time

table,

in

two

part,

continuously

with

be

(in

and

P-PT1

scanner

SCI

PART//

two

contacts.

13-20),

internal

the

is

and

of

the

square

that

and

is

detected

free-running

same

counter

then

converted

sent

to

speeds,

and a jumper

the

CPU.

2MHz

8MHz

scanned

The

case

of a 1

CARRY

wave,

is

depressed

tn

reply

tn

either

does

DESCRIPTION

The

inner

the

outer

ones

on

the

counter

key

closes,

value,

the

CPU.

giving

to a velocity

and 1 MHz.

on

PCB 2 connects

indicated

except

column

MHz

output

or

thp

the

not

recognize

on

enable

6801)

(U230-8)

except

released,

interrupt-

CPU

is

contacts

through

inner

is

the

noted

the

value

Early

the

schematic.

when

the

an 8 kHz

for a momentary

while

Ahsf*nra»

not

that

are

read

port

four

contact,

noted.

time-of-flight

the

When

value

using

is

an

production

its

clock

scanner

CLOCK

string

should

the

scanner

of

responding

the

CPU

is

input

of

be

an

to

is

U231

U232

The

outputs

inputs

from

internal

or

4MHz

and 3 (pins

11

is

unused

(pin

38)

through reset

Optoisolator

B-l,

(pin

sheet

(described

internal

through

phototransistor

places a low

pulls

RXDATA

Memory

to

the

shift

the

matrix

clock

is

connected

and

is

port 3 (pins

LED,

the

oscillator

supplied

10/11)

connected

unused,

to

are

not

directly

to

as

22-29),

6)

at

power

A.

The

under

through

LED

up

current

U219)

turns

(internal

on

U219-2,

high.

address

decoder

register

rows

is

pin 3 (EXTAL)

+5V

is

by

comes

U231-1

it

are

pulled

are

pulled

not

used,

pin 2 (XTAL)

from

used.

10

is

to

+5V

digital.

digital,

40.

as

Output

buffered

-RESET,

1-330

from a MIDI

in

on,

to

U231,

RXDATA.

1-253

U235-10.

pin 5 of

and

R226,

and

its

between

If

up

by

R234/35,

down

by

RP201/02.

is

grounded,

U207-10.

pulled

is

by

transmitter

up

Both

standby

to

the

U228/29.

PC-900

J201,

and

out

light

turns

Port

through

interrupt

Vcc

CPU

The

optoisolator

similar

through

J201-*.

on

pins 4 and

no

current

is

flowing,

7*HC13S

and

the

Since

the

and

two

bits

R240,

inputs

(pin

data

and

are

21).

SC2

buss

scanner

to

Q201

U231-2,

the

5),

the

Current

adjacent

which

R224

8

2

is

TM615A

B-3,

sheet

volatile

(-MREQ

A.

RAMs,

true)

Decodes

U223

with

the

through

A15

31

memory

U227.

high

and

chip

selects

When a memory

AH

low,

for

request

U220

the

five

is

Combo

non

made

chip

DESIGNATOR

FUNCTION

SCI

PART*

DESCRIPTION

U233-3

U233-6

U233-8

produces

low,

(pins

Before

-PWR

chip

on

power-up,

NV

C-2,

Battery

NV

C-2,

Battery

-IOREQ

a

-RAMO

according

1-3).

the

chip

ON

signal

selects

chip

sheet

chip

sheet

from

or

select

A.

Inhibits

powered

select

A.

Inhibits

powered

gate

true,

enabling

to

the

state

select

gets

from

the

to

power

occurring

during

gate

from

gate

from

power^down.

1-251

chip

selects

+Vnv.

1-251

chip

selects

+Vnv.

U232.

of

address

the

until

See

U232.

See U232.

1-251

One

buss

memory

on

logic

the

power

to

U223

to

UZZ1

of

its

outputs

lines

chip,

(see

supplies

while

While

All

through

it

is

gated

U235-4)

have

7«HC32

power

7*HC32

power

7*HC32

then

goes

A13

with

the

to

prevent

stabilized

is

unstable.

Is

unstable.

U233-11

U23*-3,-li

U234-6

U234-8

B-3,

sheet

is

enabled

NV

chip

C-2,

Battery

OR

gate

Not

used.

NV

chip

C-2,

Battery

NV

chip

C-2,

Battery

A.

when

select

sheet

powered

select

sheet

powered

select

sheet

powered

Inhibits

gate

A.

Inhibits

gate

A.

Inhibits

gate

A.

Inhibits

-IOREQ

A4

is

high.)

chip

from

+Vnv.

chip

+Vnv.

chip

+Vnv.

signal

Battery

1-251

selects

See

1-251

selects to

See

1-251

selects

See

to

U22Q

powered

to

U225

U232.

U226

U232.

to

U227

U232.

while

from

while

A*

+Vnv.

7*HC32

power

7WC32

power

74HC32

power

is

high.

is

(U204

unstable.

is

unstable.

is

unstable.

TM615A

32

DESIGNATOR

FUNCTION

SCI

PART//

DESCRIPTION

U235-1

Interrupt

B-l,

sheet

function.

the

-KEYINT

active U235-2.

A

high

U221-16,

U235-4,-10,-13

Power

Incoming

R106

of

from

10*

at

low,

produce a change

charges

takes

the

normal

and

U235.

BT201

detect

-5

and

Previously,

making

-RESET

logic

B.

Sums

First,

(low)

Completion

on

either

-INT

detect

15VAC

R232,

U235

-6

the

"seven

signal

on

of

its

of

the

logic

power

and

filtered

is

always

through

the

first

wave,

rises

past

pins 8 and 9 wore

pins g ana y wore

-RESET

in

the

through

place

operation

R233

after

signal.

the

When

commences.

1-248

the

three interrupt

millisecond"

from

CPU.

U230-12

either

count

inputs

is

or

both

by

U209/10

produces a low

(See

U221.)

1-248

full-wave

by

C108.

are

rectified

operational

D210.

true

to

supply

When

C108

U235's

and

output

the

-RESET

begins

logic

high,

-PWR

until

low

has

power

threshold,

ON

pin 9 also

on

stabilized,

goes

7*HC02

inputs

interrupt

combined

of

them

produces

on

74HC02

by

D219

because

protects

it

is

first

to

charge

produces a low

of

ol

false. A low

goes

4.

This

controls

high

and

with a logicai

from

U230-23

by

U205-11.

produces a high

a

high

on

1,

which

D103/0*,

divided

inputs

is

supplied

turned

and,

charge

-PWR

on,

as

the

»,

su

»,

so

p

on

pin 8 cannot

low,

after

time,

the

length

ON

goes

OR

and

An

on

U235-3.

goes

to

by

-5

and-6

by

Vnv

D103

or

voltage

on

10

C219

which

of

low,

U236

When

through

causing

^PWR

chip

RAM

that,

length

Keyboard

A-3,

columns from

keyboard

negative

advancing

through

Q4-Q7

to

power

R232,

(through

ON

is

selects

from

if

power

is

obtained.

Column

sheet

of

U235-13

scanner

pulse

it

Q3

are

high,

keep

track

is

false.

to

involuntary

C.

the

resets

to

are

of

removed

and

when

-RESET

non-volatile

from

the

8)

the

threshold

10

to

stops

RAM

erasure.

is

immediately

Enable

This

decoded

keyboard

the

counter

(U230)

out

P20

(pin

the

CARRY

the

state

re-applied,

1-207

divide-by-eight

matrix.

has

finished

8)

to

count.

CARRY

is

low.

of

the

counter.

circuit,

is

passed,

go

low,

the

Z-80A

(see

U233

D220

discharges

a

On

power

to

"0."

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reading

the

CLOCK

Now

Ql

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output

This

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way

the

(See

C108

discharges

U235-4

so

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and

-PWR

and

U232),

C219

-RESET

4022

pulse

octal

counter

up,

the

-PWR

pin 2 is

high.)

column

input

12)

scanner

U230.)

of

1)

is

high.

is

highland

quickly

goes

high,

is

true

and

ON

inhibits

protecting

quickly

of

counter

drives

ON

When

0,

it

the

counter,

When

so

normal

the

signal

the

sends

a

Q0

when

can

read

P21

TM615A

33

DESIGNATOR

SCI

PART//

DESCRIPTION

BT201

E-040

PASSIVE

COMPONENTS

2.9V

LITHIUM

BATTERY

DESCRIPTION

TB201

U211

U212

Y201

E-171

R-300

T-011

E-112

NON-DESIGNATED

J-016

3-045

M-486

DUAL

10K

2K

10K

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240

270

150

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(see

20

ANGLE

39 X 8

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8

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5%

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SIP

KEY

switch

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RESISTOR

MHZ

CRYSTAL

100K

5%

REV

100K

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cap

RIB

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CA3082

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40

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SOCKET

28

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(Used

on

HEATSINK

U201.)

LINEAR

PC

LINEAR

5%

below)

JUMP

NETWORK

3/10"W

TAPER

RIGHT

S-093

S-094

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ORANGE

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CAP

TM615A

35

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See

Figure 2 for

1.

Warm-up

2.

Hold

Program

sets

the

DAC

(This

switching

3.

accuracy

4.

reading

,5.

6.

figured

also

power

Use a 3&

or

On

PCB

of

OV

Add 1 millivolt

Connect

in

step

location of

615

(with

Record

output

locks-up

off/on.)

digit

DVM

better.

3,

connect

+/-

0.1

DVM

to

5_»

+/-

trimmers

cover

to

the

closed)

and

press

OV

to

allow

computer

with a

DViM

100

to

TPA

millivolt.

to

the

reading

TPB

and

0*1

millivolt.

obtained

trim

and

test

points.

for

at

least

five

minutes.

PROGRAM/PARAMETER

you

to

measure

so

that

millivolt

and

trim

R309

Inverter

full

R311

in

step

to

the

reset

scale

range

DAC

4.

offset

7.

DAC

will

require

and

offset

to

the

This

offset.

0.05%

for

a

value

Figure

Trimmer

7.

polish

2

and

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the

trimmers

as

it

will

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215

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sealer

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ADJUSTMENT

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make

is

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131st

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with

latex

readjustment

available

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from:

Inc.

90061

FOR

TP(A)

TP<B)

FOR

TP(B)

sealer

or

equivalent*

impossible.

Do

not

use

nail

order

TM615A

Model

TC-530

flexible

mask

and

mold

seal

AUDIO

OUTPUT

FIELD

UPDATE

Some

present

following

procedure

PARTS

QUANTITY

PROCEDURE;

instruments

on

the

procedure

also

REQUIRED

SCI

3

1

2

1

1"

1.

Disassemble

2.

Refer

to

a.

Remove

prior

audio

increases

PART

C-045

C-103

R-047

R-068

R-014

the

Figure

one

to

S/N

output.

should

the

//

In

audio

instrument

3,

Siikscreen,

R-029

68*

had

excessive

response

be

performed

output

to

customer

under

volume

DESCRIPTION

.1

uf

DECOUPLING

47

uf

ELECTROLYTIC

10

ohm

ft W 5%

100

ohm

»W5%

15k

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or

smaller

and

remove

wire,

PCB

and perform

1M K W.

resistor.

hum

and

complaints,

warranty.

slightly.

CAP

RESISTOR

Teflon

insulated.

3.

the

following

noise

the

This

steps:

b.

Replace

ohm % W.

3.

Refer

following

e.

4.

Refer

following

a.

b.

c.

a.

Cut

b.

Add

c.

Add

d.

Add

steps:

Cut

Add

to

Figure

steps:

five

one

to

Figure

one

two

one

R-076

4,

Component

traces

R-068

R-047

C-045

C-103

100

10

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5,

trace.

jump.

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27K

54

W.

resistor

side

ohm

54

W.

resistor

ohm

S4

W.

resistor

uf

capacitor

uf

capacitor

Solder

side

traces,

capacitors

with

one

traces,

and

perform

and

perform

R-014

15k

the

5.

Reassemble

TM615A

d.

Add

one

R-068

and

100

ohm

J4

W.

resistor.

perform a complete

functional

test.

—

R-010

—

R-010

—

R-010

-

R-008 — C-0031

—R-052—

—R-030—

—

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—

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—

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—

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615-3

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37

—

TM615A

CUT

TRACE

R-68

100

SI

CUT 2 TRACES

Figure « Component

TM615A

side

.1uF

CUT 2 TRACES

traces

Figure 5 Solder

TM615A

side

traces

DESIGNATOR

FUNCTION

SCI

PART//

DESCRIPTION

U301/02

U303

U304

PARTS

Not

used

DAC

C-4,

sheet

the

most

lines

DAC

D-4,

strobed, the

data

buss

LIST/FUNCTIONAL

INTEGRATED

latch-hi

E.

When

significant

D0-D5.

latch-lo

sheet

E.

least

lines

Z-342

CIRCUITS

1-228

-DAC

When

significant

D2-D7.

HI,

six

bits

-DAC

1-228

DESCRIPTION

from

of

LO,

DAC

from

six

bits

U220

SCI

data

U220

of

combo

is

latched

DAC

Board

4174

data

hex

SCI

3,

chip,

from

combo

is

Assembled

latch

is

strobed,

data

buss

latch

chip,

latched

is

from

U305

U306

Mux/demux

A-4,

sheet

all,

it

outputs

data

is

Secondly,

data

buss

address

B.

This

holds

taken

the

Q3

(least

from

the

13th,

bit

7,

address

and

U311.)

Thirdly,

appears

selected,

the

The

Demux

A-*,

U307),

output.

latched

goes

(U312/13,

addressed

input.

the

pot

multiplexer

on

Ql

and

D304

and

open-collector

latch

DAC

strobe

enable

sheet

to

E.

U306

The

by

selects

selection

the

U314,

is

low

The

selected

voltage

is

latch

After

-SHEN

Inhibit

and

(see

latch

is

an

significant),

bits

or

goes

Q2,

D305,

output

-SHAD

1-228

output

of

the

Q4,

D0-D2

sign

of

bit,

from

address

and

goes

through

of

U310.

from

latch

with

sample/hold

and

Q5

the

CPU

of

the

DAC

U305-7

is

latched~ffom

to

U311-10

R316,

(See

U220

provide a pullup

U311.)

Combo

1-228

the

DAC

one

of

data

comes

signal

lines

U318-20,

the

rest

Sample/Hold

has

had

the

multiplexers

from

(decoded

of

the

CPU

by

multiplexers

respectively.)

are

inhibited

now

opens

U312).

4174

three

functions.

currently

(most

data

to

and

significant).

buss.

is

latched

U311

-9.

Chip.

4174

time

U220

to

data

buss

SCI

settle

receive

Combo

The

by a high

and

begins

hex

latch

First

selected,

from

address

bits

When a pot

hex

A.

D5

and

voltage

latch

(see

the

bits

D0-D5,

Chip)

for

Voices

voice

currently

on

their

to

charge

of

on

This

CPU

(See

D6,

is

for

U305,

DAC

is

and

1-6.

T

to

TM615A

DESIGNATOR

FUNCTION

SCI

PART#

DESCRIPTION

U307

12-Bit

D-4,

synthesizer

The

reference

current

ladder.

controlled

off,

connected

1),

output

feedback

U308

that

is

connected

Therefore,

Note

than

any

12

are

causing a non-linearity

DAC

sheet

E.

chips.

7541

which

the

problem,

causes

dependent

is a CMOS

internal

voltage

to

How

At

the

by

the

current

to

ground.

goes

amplifier

resistor

produces

is

enual

and

action

to

U308-6

that

the

.lmV

by

but

error

Generates

The

DAC-

resistor

from

through

other

end

corresponding

is

dumped

If

to

the

twelve-bit

It

ladder

U309-1.

each

of

each

the

bit

virtual

(current-to-voltage

connected

an output

opposite

of

the

ground)

swings

input

R311.

offset

because

currents

on

the

voltage

to

op

and

inverting

from 0 to

voltage

This

is

any

to

pattern

in

the

that

amp

not

flow

control

word

gets

network

This

weighted

arm

bit

onto

current

is

on,

ground

voltages

comes

15-volt

is

voltage

arm

is a current

from

the

current

inverting

converter).

from

II

to

Rfb

that

drives a current

flowinc

to

from

keep

inputs

^4V.

of

U308

because a DC

difference

through

of

bits

output.

in

applied

DAC7541

that

from

analog

supplied a stable

(12

bit)

control

latches

power

U303/0*f.

at

the

16.

+*V

causes a proportional

of

the

12-bit

steering

DAC

bus

its

at

must

voltage

the

latch.

12

(pin

is

input

Inside

(pin

Vref

If

2)j

routed

of

U30S

the

18)

and

through

throuch

noninverting

the

same

be

trimmed

output

ladder

error

between

whose

to

the

DAC,

DAC

switch,

the

bit

is

which

to

is

II

(pin

DAC

is

a

U308-6.

Rfb

11.

This

(pin

3,

potential.

to

less

would

be

II

and

effects

thus

U308

U309-1

DAC

output

C-4,

sheet

high

capacitors.

slows

Input

slew

down

offset

description

temperature,

acceptable

bias

currents

similar

DAC

reference

D-4,

sheet

provided

within

frequency,

the

input

amplifier

E.

See

rate,

Its

overall

the

slewing

voltage

under

often a problem

limits

to

the

E.

by

divider

1%

by

bypassing.

impedance

by

flowing

problems

buffer

Unity

U101.

U307

which

for

functional

is

settling

just

enough

must

be

U307.)

the

LF411. A BIFET

through

caused

gain

non-inverting

R314/15

C313

of

provides

Buffering

U307

1-3*6

description.

useful

precisely

1-32*

for

time

is

to

prevent

controlled

Input

with

II

by

offset

BIFET

of

U307

excess

charging

improved

is

can

input

buffer.

from

+5V

Analog,

low

the

reference

(VREF)

is

frequency,

low

LF411

The

sample

by

C309,

overshoot

in

this

voltage

op

amps,

used

cause

offset

NE5532

The

which

is

and

is

here

because

non-linearities

voltage.

dual

4V

is

and

necessary

varies

LF*11

and

circuit.

drift

reduced

reference

regulated

C3136,

considerably

has

a

and

hold

which

ringing.

(See

with

to

input

op-amp

is

to

high

because

TM615A

DESIGNATOR

FUNCTION

SCI

PART//

DESCRIPTION

U309-7

from

accurate

has

headroom

rejection

supply.

DAC

C-4,

(See

image

then

and

is

output

as

tune

octave,

within

The

output

than

this

temperature

chip-to-chip.

reference.)

positive

inverter

sheet

U307,

of

selected

feedback

-i

+/-0.1%.

(TPB)

.05%.

routine

each

volt/octave),

inverter

at

TPA,

adjustment

power

for

the

ratio

of

E.

Inverts

U308)

the

DAC

by

resistor

This

could

Ordinarily,

corrects

therefore

octave.

0.05%/10 = 0.005%

DC

offset

TPB

exactly 1 LSB

when

the

characteristic

(The

3394

Pin 4 of

supplied

swing

the

to

5532

is

1-32*

adequate

the 0 to

The

result

output.

U311

means

be

this

th£

Since

DAC

is

One

as

the

R313

are

the

different

would

for

any

DAC

the

must

enhanced

be

is

loaded

of

synthesizer

U309

+4V

is

by

+V

(see

-4V

DAC

(U309-7

of

these

sign,

long-range

must

DAC

or

matched

slope

than

not

of

the

do

for a 13-bit

have

can

or

adjusted,

(VREF/4096 = .976

with

by

the

5532.

voice

supplied

UNREG,

U309-7).

to

work

signal

or

TPB)

two

outputs

13th

bit.

to

.1%

the

negative

nonlinearity

true

cover

true

13-bit

with

chip

with

to

The

with

5532

amp

from

is

a 0

Input

so

positive

(TPA),

DAC,

13-Uil

10

octaves

accuracy.

R309,

mV)

all

zeroes.

superior

requires

-6.5V

provide

an

dual

(TPA

that

The

offset

and

ample

power

supply

unregulated

low

noise

U308-6

to

resistor

portion

but

by

linediity

to

more

(TPA).

+4V

mirror

or

TPB)

R310

overall

by

tuning

(8

produce

gain

of

the

as

much

here

the

each

only

volts

positive

stability

drift

an

8

is

at

an

of

vs.

U310

U311

ADC

comparator

B-3,

sheet

U311

on

U310-2,

(pin

3)

R318.

R317

R316

DAC

ADC

B-^,

switch.

appears

(see

sign

multiplexer

sheet

VOUT

The

sign

effective

3394

synthesizer

E.

is

selected,

the

is

driven

When

provides

DAC

U305)

bit

switch/

E.

If

control

at

VOUT.

is

the

final

bit

scheme

13th

1-301

When

bit

one

of

the

pots

its

voltage

non-inverting

by

the

0 to

voltage

hysteresis

and

drives

inputs B and C are

input A is

If A is

DAC

voices.

signal

doubles

as

well

appears

comparator

+4V

DAC

exceeds

for stability.

12

1-211

low,

high,

the

going

the

as the -4

connected

on

U311-3

input.

voltage

pot

voltage,

The

of

misc

input

low,

U311

the

negative

positive

to

all

six

range

of

to

+4 V range

311

comparator

to

inputs

and,

The

inverting

from

output

U309-7,

the

output

is

buffer

4051

8-in

acts

as a DAC

DAC

signal

demultiplexers

the

DAC,

required

precision

X2-X7

through

of

R319,

input

through

goes

low.

pulled

up

by

U228.

analog

signal

is

mux

sign

bit

on

XO

selected.

(Vdac).

providing

by

an

the

TM615A

DESIGNATOR

FUNCTION

If

inputs B or C are

U310).

voice

demultiplexers

The

active.

In

this

case

the

demultiplexers

are

enabled.

Inhibit

input

Positive

(I)

and

negative

SCI

high,

the

output

(U312,

is

etc.),

tied

active

analog

PART//

switch

(Vdac)

acts

from

is

ignored,

low,

supplies

DESCRIPTION

as a

pot

multiplexer

Vout

to

pin 3 of

because

making

the

switch

are

provided.

all

none

of

(see

the

these

always

U312

R305-3,

that

DAC

signals.

Sample/hold

D-3,

On

for

two,

voices

First

and-11)

is

settling,

applied

switches.

or

between

The

connected

the

maximum

voltage

to

found

(W).

C3171/2,

demultiplexer

sheet

E.

Voice 1 Sample/Hold

oach 7 millisecond

each

opens

etc.

work

the

which

to

its

cap

begins

of

the

six

voices.

The

following

the

same.

DAC

Then

the

is

loaded

is

converted

the

demultiplexer

A,

B,

and C of

T,

U312-6,

selected

capacitor

to

charge

the

tops

of

the

on

the

wipers

on

pins

1-211

(S/H)

interrupt,

description

sample

(C335

to

tho

First,

with

to

is

for

the

voice

the

Vdac

U312,

on

address

brought

and

example,

DAC

CPU

selecting

voltage.

pots,

is

12

and

divide

less

the

than

15,

smooth

4051

8-in

(no

National)

pot

voltage

the

analog

demultiplexer.

updates

one

is

for

CV

value

U312-3,

is

loaded

low

by

hold,

completing

if

A=B=C=0)

all

08

is

updated,

voice

U306-2.

one

(see

Vin.

While

into

one

of

U307,-08,-09,

and

S/Hfs,

then

only—other

U305,

U312fs

This

the

so

maximum

wheel

mux

eight

voice

the

DAC

and

is

eight

strobes,

circuit

the

DAC.

U313

U314

TM615A

After a short

(through

Each

very

path

U306)

S/H

high

the

strobed,

R320/C318,

'digitation1

Sample/hold

B-3,

sheet

Sample/hold

D-2,

sheet

period,

and

the

consists

impedence

capiacitor

until

of a

the

for the

noise

which

demultiplexer

E.

Voice 2 Sample/Hold

demultiplexer

E.

Voice 3 Sample/Hold

the

strobe

S/H

capacitor

.01

low-leakage

of

the

339*

retains

would

the

strobe.

and

otherwise

1-211

(U312-6)

is

open

capacitor

inputs.

DAC

filter

(S/H)

Since

voltage

Lag

networks

lines

appear

demultiplexer.

is

shut

off

by

the

CPU

circuited.

in

concert

there

present

is

R321/C317

respectively,

on

the

envelopes.

4051

8-in

(no

National)

4051

8-in

(no

National)

with

the

no

discharge

when

it

was

and

smooth

analog

(See

analog

(See

out

mux

U312.)

mux

U312.)

DESIGNATOR

FUNCTION

SCI

PART//

DESCRIPTION

U315

Synthesizer

D-3,

controlled

a

(OSC)

a

input,

a

resonance

a

frequency

voice

sheet

E.

voices

multi-waveshape

and

pulse

mixer

(MIX)

four-pole

(RES),

VCA

which

input

and a final

See

Figure

filter

CAP

actually

attached

6.

CAPS A through D determine

pole.

The

to

the

VCO

ac-couples

REF

chip

The

which

1-336

CEM

3394s

contain:

oscillator

width

to

low-pass

applies

CV

VCA

(VCA)

CAP

pin,

OUT

(PW),

balance

filter

(FIL

which

sets

the

sets

are

(SHAPE)

the

oscillator

with

adjustable

the

oscillator

MOD),

shapes

the

basic

filter

basic

output

oscillator

CEM3394

highly-integrated

with

variable

against

frequency

output

the

voice

the

oscillator

to

the

range.

dynamics.

frequencies

range.

VCA

voltage-

frequency

an

external

(FIL),

to

the

The

input.

and

filter

of

each

VCA

R326,

Figure

339*

TM615A

6

BLOCK

DIAGRAM

The

external

and

amplifier

R338

Voice

U324

serves

audio

(for

30Ott

F*€Q

audio

as

outputs,

feedback

input

Q302.

an

C384

output

to

the

of

all

voices

ac-couples

load.

19,

go

to

switches

CPU

for

the

is

driven

the

noise

tune

routine).

BAL.

by

Q301

to

U327

noise

the

3394s,

(for

audio)

source

and

DESIGNATOR

FUNCTION

SCI

PART//

DESCRIPTION

U316

U317

U318

U319

U320

Synthesizer

B-3,

sheet

Synthesizer

D-2, sheet

Sample/hold

B-2,

sheet

Sample/hold

D-l,

sheet

Sample/hold

B-l,

sheet

voice

E.

voice

E.

chip

Voice

chip

Voice

demultiplexer

E.

Voice

demultiplexer

E.

Voice

demultiplexer

E.

Voice

1-336

2

synthesizer

3

synthesizer

chip.

1-336

chip.

(See

1-211

-4

Sample/Hold

1-211

5

Sample/Hold

1-211

6

Sample/Hold

(S/H)

CEM3394

U315.)

CEM3394

U315.)

4051

8-in

analog

(no

National)

demultiplexer.

4051

(no

demultiplexer.

4051

(no

demultiplexer.

(See

8-in

analog

National)

(See

8-in

analog

National)

(See

mux

U312.)

mux

U312.)

mux

U312.)

U321

U322

U323

U324

Synthesizer

B-2,

sheet

Synthesizer

D-l,

sheet

Synthesizer

B-l,

sheet

Tune

analog

A-4,

sheet

FET

switch.

the

gates

inputs,

ordinarily

(indicating

inverter

to

the

voice

E.

voice

E.

voice

E.

D.

of

A-F).

be

the

outputs

inverting

chip

Voice 4 synthesizer

chip

Voice 5 synthesizer

chip

Voice 6 synthesizer

switch

The

control

the

six

The

output

the

inverter

TUNE

to

input

4049

is

connected

input,

FET's

of

cycle),

Vss,

of

U326-1.

1-336

chip.

1-336

1-209

(what

each

output.

there

8,

effectively

(See

chip.

-AUDIO

(See

in

an

would

voice

ordinarily

is

When

is a low

CEM3394

U315.)

CEM3394

U315.)

CEM3394

U315.)

4049

hex

invtr/driver

unconventional

ENABLE,

is

be

connected

-AUDIO

ENABLE

impedance

connecting

way

connected

the

inverter

to

what

would

is

from

all

the

inputs

as

a

to

high

the

TM615A

52

DESIGNATOR

FUNCTION

This

is a current-mode

a

current

switch

voltage

which

inputs

swings

is

and

from

SCI

PART//

switch,

converted

output

damaging

that

to a voltage

should

be

the

is,

the

outputs

by

OV.

D307-18

switch.

DESCRIPTION

of

the

3394's

U326.

The

signal

prevent

excessive

are

at

the

U325

U326-1

Note

defect

The

individually

Audio

B-4,

is

-AUDIO

three

connected

if a plug

U32S

the

These

switch

excessive

Tune

A-ft,

input

C304

diminish

that

in

bad

switch

sheet

used

sections

he

input

mixer.

input

are

input

buffer

sheet

(see

improves

since

any

voice

D.

for

all

of

the

should

tested

Audio

each

ENABLE,

are

to

either

is

not

present

current

If a plug

is

switched

current-mode

and

voltage

D.

Current-to-voltage

U324).

overshoot.

Has

overall

3394

using the

output

and

inhibited.

the X or

Is

sleeted

outputs

swing

outputs

voice.

is

to

very

speed

could

have

Track

1-243

switch

Inhibit

when

U326-13,

from

high

When

the Y output.

in

3305,

d

lu

present

switches.

should

damaging

1-332

high

by

are

tied

together

cause

no

audio

them

audio

output.

outputs

all

on

*053

for

voices

input

(as

during

inhibit

U325-10

llie Y uutput,

in

3305,

voice 4 output

As

with

be

4-6. A separate

(pin

the

is

low,

On

voice

is

pulled

the

U325-10

buffer.

U324,

0V.

D307-18

the

switch.

084/TL07*CN

op

converter

gain

so

slowing

for

that

it

down

the

acts

during

to

be

Voices

the

6)

comes

tune

the A input

4,

up

by

summing

is

grounded,

the

amp

tune

tune,

out

of

can

back

panel.

section

a

tune.

be

from

routine),

for

example,

R350,

signal

prevent

comparator

all

is

and

node

and

at

the

any

quad

of

as a comparator.

slewing

enough

to

U326-7

U326-8

TM615A

Track 6 audio

B-4,

sheet

track

production

resistor

arrangement,

output.

to

Track 5 audio

B-4,

sheet

output

D. Buffer

Gm-setting

from

protect

see

output

D.

Buffer

U326--7.

buffer

and

2.7k

to 1.2k

the

output.

U325.

buffer

for

53

1-332

V-to-I

resistor

converter

R345

ohms.

For

R344

explanation

1-332

voice 5 individual

084/TL074CN

op

amp

for

voice 6 individual

was

changed

is a current

of

the

084/TL074CN

op

amp

track

in

limiting

3303

switching

output.

quad

early

quad

See

DESIGNATOR

FUNCTION

SCI

PART//

DESCRIPTION

U326-14

U327

U328-1

U328-7

Track 4 audio

C-4,

U326-7.

Audio

B-4,

sheet

switch

sheet

output

D.

Audio

Mixer

Sums

bus

becomes

Track 3 audio

C-*,

U326-7.

the

current outputs

of

U325/27.

the

dry

output

sheet

D.

buffer

Buffer

R362

MIX

for

output

sets

audio

buffer

Buffer

for

1-332

voice

1-2*3

switch

individual

for

voices

1-332

of

all

339Vs

the

output

output,

which

level.

and

is

1-332

voice 3 individual

084/TL07»CN

op

4053

1-3.

084/TL074CN

op

are

The

processed

084/TL074CN

op

amp

track

See

amp

switched

output

amp

track

output.

U325.

of

by

the

chorus.

output.

to

this

quad

See

quad

the

Y

stage

quad

See

U328-8

U328-14

U329

Track 2 audio

D-^,

U326-7.

sheet

Track 1 audio

D-4,

U326-7.

Tune

A-3,

is

the

through

output

to

measure

and

sheet

comparator

sheet

operated.

inverting

R353.

changes

U220

C3130

output

D.

output

D.

During

Its

signal

input

When

polarity.

Combo

the

oscillator's

is

also

buffer

Buffer

for

buffer

Buffer

for

the

tune

proceeds

of

U329.

the

oscillator

The

chip,

added

where

period.

for

1-332

voice 2 individual

1-332

voice 1 individuals

1-301

routine,

through

The

only

U324,

non-inverting

signal

output

counters

is

R356

adds

pulled

under

08*/TL07*CN

op

amp

track

084/TL074CN

op

amp

track

311

comparator

one

oscillator

U326-1,

input

crosses

OV,

up

by

R3127

control

hysteresis

stability.

quad

output.

See

quad

output.

See

precision

at a time

and

R3128

is

grounded

the

comparator

and

goes

of

the

CPU

for

stability,

to

U330

TM615A

Analog

C-l,

but

delay

sheet

the

location

line

D.

This

1-338

designator

is

U331,

is

not

printed

sharing

Reticon

delay

on

Rev B silk

the

same

5106

16-pin

analog

screens,

DIP

hole

DESIGNATOR

FUNCTION

SCI

PART//

DESCRIPTION

U331

U332-1

pattern.

stuffed,

bias

not

which

Analog

D-l,

stage

several

R368

voltage

C3173

1

is

output goes through

description

Not

In

most

U331

for

used.

Pin 4 is

clocks

delay

sheet

D.

bucket

other

models,

will

also

5,

which

the

sampled

line

If

U330

brigades.)

brigade.)

parts

added,

provides a bias

at

pin 5 should

capacitively

the

clock

under

used

couples

input,

U333-f.

is

and

R372

this

part

is

not

be a 5106.

filtered

output,

signal

Input

by

C3141.

and

pin 1 is

through

1-349

present,

Otherwise,

Also,

as

for

be

about

pin 4 is

to

both

parts

U331

if

U330

indicated

5,

is

on

which

-5.8V.

the

input.

buffer

1-205

Sync,

the

output.

U333-7.

stuffed

is

to

the

(see

2,

the

square

stages.

Reticon

analog

will

be

will

be a 5107.

used,

R369

R372

the

schematic.

is

filtered

biases

on

If

U330

If

U330

4013

U331).

6.

R371

the

sync

If

derives

input,

wave

5107

delay

5106!s.

(Two

(One

is

removed

by

C3140.

the

input,

2,

is

not

used.

is

not

used,

is

used,

dual

see

flip-flop

it

is

a

is

input

(5106)

512-

1024-

and

The

6.

the

U332-13

U333-1

U333-2

Chorus

A-l,

symmetrical

Chorus

D-2,

capacitively

At

U333-16.

the

to

The

schematic,

Chorus

B-2,

Q303,

wiper

clock

sheet

input

sheet

the

divider

D.

Divides

square

filter

D.

coupled

input

of

R3109/C3163,

three

improve

poles

damping.

substrate

A-2,

LFO

sine

sheet

D.

Emitter

rounds

of

off

R236.

Emitter

of

of sheet

shaper

the

wave

the

to

follower

through

filter,

R3107/C3160,

the

filter,

U333

D,

under

follower

peaks

1-205

chorus

drive

T-011

clock

the

stage.

C3164

R3110

to a three-pole

output

bucket

provides-

and

C3160

is

bypassed

to

"spares11.)

T-011

of

the

stage.

This

triangle

4013

dual

flip-flop

by

two.

brigades.

Multiple

CA3082

The

output

bias

of

low-pass

for

R3108/C3162

provides

-6.5V

wave

positive

by

C3170.

Multiple

CA3082

stage,

in

concert

coming

Provides

transistor

U336-1

the

a

is

filter.

base,

comprise

feedback

(See

transistor

with

in

from

the

TM615A

DESIGNATOR

FUNCTION

SCI

PART//

DESCRIPTION

U333-*

U333-7

U333-9

U333-12

Chorus

D-l,

has

If

through

base,

signal

input,

Delay

C-3,

line.

capacitor

Chorus

C-2,

Chorus

D-3,

isolation

of

signal,

emphasis

delay

sheet

no

U330

D.

function.

is

used,

input

U333-6.

is

developed

U330-6.

line

output

sheet

Input

C3143.

output

sheet D.

input

sheet

resistor

base

U333-U

which

stage,

line

D.

is

D.

buffer

Emitter

resistor

The

follower

R372

is

R367

base

is

absent,

across

buffer

Emitter

from

R370

filter

Same

buffer

Emitter

R382

and

is

capacitively

U336-1.

follower

R372

provides

as

input

follower

and

bias

T-011

stage.

and

coupling

biased

emitter

through

resistor

T-011

buffering

or

R374

bias,

and

I-oil

filter,

T-011

coupling

resistor

U333-1.

buffer.

capacitor

R380.

coupled

If

U330

the

output

R375

(see

R376

The

R384

to

Multiple

CA3082

is

not

present,

of

U331

capacitor

and

R371.

R373

the

and

Multiple

CA3082

output

U330/31)

develops

Multiple

CA3082

Multiple

CA3082

input

C3146

develops

the

input

is

C3137

The

applied

of

and

the

transistor

comes

to

the

of

transistor

U333-4

coupled

to

the

output

to

the

transistor

the

delay

coupling

output.

transistor

through

junction

output

the

pre-

U333-14

U334-2

U334-6

TM615A

Not

used

A-2,

sheet

Chorus

A-l, sheet D.

Chorus

A-l,

sheet

Chorus

A-l,

frequency

chips

through

D.

For

clock

sheet

buffer

Drives

buffer

D.

Drives

oscillator

D.

oscillator

U330/31.

one

FET

T-011

explanation

of

1-209

the

bucket

brigade

1-209

the

chorus

With

U334-15,

to

clock

Oscillator

of

U335

(pins

56

clock

1-209

C3158,

the

frequency

10-12).

C3170,

see

clock

divider.

and

signals

is

Multiple

CA3082

U333-1.

«049

hex

inputs.

*049

hex

R3111,

through

controlled

transistor

invtr/driver

forms a high-

bucket

by

the

brigade

LFO

DESIGNATOR

U334-10

U334-12

FUNCTION

Chorus

B-2,

U337-8

U335-8.

Not

on/off

sheet

so

used

D.

that

switch

Boosts

buffer

it

goes

the

SCI

PART//

1-209

chorus

rail-to-rail,

1-209

on/off

signal

to

completely

DESCRIPTION

4049

hex

invtr/driver

from

40*9

level

turn

hex

invtr/driver

shifter

off

switch

U334-15

U335-6,7,8

U335-li,12

U336-1

Chorus

A-2,

Chorus

B-2,

providing a low

Chorus

A-2,

determines

and

sine

Chorus

D-2,

coupling

network

high-frequency

the

C5153

clock

sheet

on/off

sheet

clock

sheet

is

determined

shaper.

oscillator

D.

See

U334-6.

switch

D.

When

impedance

VC

FET

D.

The

resistance

the

frequency

by

pre-emphasis

sheet

D.

the

output

The

input

C3150/R388/R386

components

tendency

rolls

of

off

the

response

U334-10

the

of

delay

1-209

1-202

is

high

path

1-202

between

of

the

bucket

voltage

on

1-332

to

this

stage

emitter

follower

provides

of

the

line

to

above

the

40*9

hex

(Chorus

between

pins

11

brigade

the

gate,

4007

and

4007

and

dual

inverter.

off),

the

C307

dual

inverter

and

12

clock

(see

10,

from

084/TL074CN

op

amp

is

from

pre-emphasis,

input

generate

signal

audio

C3149,

U333-12

in

Rev

boosting

"to

compensate

high-frequency

range.

invtr/driver

comp

FET

and

comp

of

pair

is

on,

-6.5V,

pair

the

FET

U334-6),

the

LFO

quad

capacitively

B.

Input

the

for

noise.

U336-7

Output

B-2,

through

R389/C3152/R391

input

through

frequency

overall

stability.

de-emphasis

sheet

pre-emphasis

D.

C3147

this

noise

cut,

since

The

output

to

input

rolls

off

stage

are

generated

it

wasn't

57

returned

1-332

of

smoothing

resistor

high

frequencies

U336-1.

in

the

boosted

R387.

Input

to

their

delay

before.

084/TL074CN

op

amp

filter

U333-9

Feedback

with a curve

high

line,

frequencies

former

however,

C3151

levels.

provides

quad

is

coupled

network

inverse

to

passing

High-

suffers

an

stage

DESIGNATOR

FUNCTION

SCI

PART//

DESCRIPTION

U336-8

U336-14

U337-1

Chorus

B-2,

"dry + effect"

the

Dry -effect

C-l,

through

the

resistor

passed

its

and

Low

B-3,

positive

through

is

resulting

inverter

sheet

delay

sheet

D.

signal

D.

R301,

delayed

R394

to

the

wiper

at the

through

Freq

sheet

R3125

Oscillator

D. This

feedback.

R3114.

positive

in a square

Unity

output

applied

output

Inverting

the

signal

is

shunted

top

of

R3100

When

U337-14.)

1-332

gain

inverter

(U337-8)

to

the

summer

dry

from

dual-ganged

to

the

is a comparator

The

the

supply

1-332

summer

(original)

U336-7

by

C3157

to

the

ring

1-332

inverting

input

rail.

wave

generates a delay

that

is

"dry -effect"

of

signal

via

to

Master

tip

of

J310

input

to

R3120

The

transitions

with

08*/TL07*CN

op

180

degrees

output

08*/TL07*CN

op

signals

through

R397

improve

3309

(Mix

circuit,

from

R398

and

stability.

Volume

(Mix

AUDIO

08*/TL07*CN

op

with

is

referenced

is

above

are

rounded

leading

amp

signal

out

of

for

phase

(U336-14).

amp

the

metronome,

and

R390,

R396.

pot

R23S,

AUDIO

OUTPUT

amp

R3118

ground,

slewed

Feedback

The

output

and

OUTPUT

B).

providing

to

ground

the

output

by

C3165,

edges.

quad

the

with

quad

and

is

from

A)

quad

(See

U337-7

U337-8

U337-14

Level

3-2,

biased

applied

pin 7 swings

Dry + effect

B-l,

from

with

Low

B-3,

from

R3124.

control,

it

output

The

controlled

shifter

sheet

D.

to

+2.5V

to

the

from

output

sheet

D.

inverter

this

output

Freq

Oscillator

sheet

D.

U337-1

Depending

output

crosses

the

changes

resultant

by

RATE.

non-inverting

Similar

U336-S.

Integrator.

is

threshold

polarity,

1-332

Open-loop

through

one

summer

is

R243.

comparator.

R3115

signal

rail

to

the

1-332

to

U336-14,

The

portion

1-332

(See

fed

through

on

the

size

14

is a ramp

of

comparator

and

the

output

is a triangle

The

and

R3117.

crosses

other.

except

of

the

dual-ganged

U337-1.)

RATE

of

control

the

signal

proceeding

U337-1,

ramp

at

U337-14

wave,

084/TL074CN

op

amp

non-inverting

When

the-2.3V

the

logic

threshold,

08*/TL07«CN

op

amp

that

the

delay

pot

associated

084/TL07*CN

op

amp

The

square

R237

as

adjusted

at a certain

wave

to

input

by

rate.

the

comparator's

changes

with

its

quad

input

is

signal

output

quad

input

is

quad

output

resistor

the

rate

When

direction.

frequency

TM615A

DESCRIPTION

PASSIVE

COMPONENTS

47

35V

ELECT

1.0

25V

20%

33P 50V

2.2UF

RADIAL

.1

50V

DECOUPLER

33P

50V

.1

50V

DECOUPLER

10

16V

10%

.01

50V

20%

.001

50V

.01

50V

20%

.001

50V

.01

50V

20%

.001

50V

.01

50V

20%

.002

5%

♦ 1 50V

.01

.1

.033

560PF

10

.01

.002

.1

.01

.1

.033

560PF

10

.01

.002

.1

.01

.1

.033

560PF

10

.01

.001

.01

.001

.01

.001

1UF

2.2

1UF

.01

.002

DECOUPLER

50V

20%

50V

DECOUPLER

100V

50V

16V

10%

50V

20%

5%

50V

DECOUPLER

50V

20%

50V

DECOUPLER

100V

50V

16V

10%

50V

20%

5%

POLY

50V

DECOUPLE-R-MONO

50V

20%

50V

DECOUPLER

100V

50W

16V

10%

50V

20%

50V

20%

50V

20%

50V

15V

ELECT

50V

20%

5%

POLY

RADIAL

TANT

10%

50V

DISC

RADIAL

NONPOLAR

MONO

10%

DISC

ELECT

MYLAR

10%

MYLAR

10%

MYLAR

10%

MYLAR

POLY

MYLAR

10%

DISC

ELECT

MYLAR

POLY

MYLAR

10%

DISC

ELECT

MYLAR

10%

DISC

ELECT

MYLAR

10%

MYLAR

10%

MYLAR

10%

ELECT

RADIAL

MONO

AXIAL

RADIAL

MYLAR

RADIAL

MYLAR

RADIAL

MYLAR

RADIAL

AXIAL

MONO

RADIAL

MONO

MYLAR

RADIAL

AXIAL

RADIAL

AXIAL

MONO

RADIAL

MONO

MYLAR

RADIAL

AXIAL

RADIAL

AXIAL

RADIAL

MONO

MYLAR

RADIAL

AXIAL

RADIAL

MYLAR

RADIAL

MYLAR

RADIAL

MYLAR

RADIAL

AXIAL

RADIAL

ELECT RADIAL

MYLAR

AXIAL

RADIAL

ELECT

RADIAL

NON-POL

TM615A

59

DESCRIPTION

.1

50V

DECOUPLER

.01

50V

20%

MYLAR

.1

50V

DECOUPLER

.033

100V

560PF

10

16V

.01

50V

.002

.1

50V

.01

50V

.1

50V

.033

560PF

10

16V

.01

50V

.002

5%

.1

50V

ni

snv

.1

50V

.033

560PF

10

16V

.1

50V

.1

50V

.1

50V

.1

50V

1UF

47UF

A7

35V

.033

1UF

.0033

470P

.0*7

.068

.0082

.47UF

.0068

100P

.0068

100P

.1

50V

100P

68P

20%

33P 50V

.0082

.1

50V

*70P

.0033

.033

.01

50V

.1

50V

10%

MYLAR

50V

DISC

10%

ELECT

20%

MYLAR

5%

POLY

DECOUPLER

20%

AXIAL

MYLAR

DECOUPLER

100V

10%

MYLAR

50V

DISC

10%

ELECT

20%

MYLAR

POLY

DECOUPLER

70%

DECOUPLER

50V

10%

AXIAL

MYLAR

10%

MYLAR

DISC

ELECT

DECOUPLER

50V

ELECT

10V

ELECT

20%

TANT

100V

10%

MYLAR

50V

ELECT

5%

MYLAR

50V

10%

DISC

50V

10%

M_YLAR

5%

MYLAR

10%

RADIAL

5%

MYLAR

3%

MYLAR

50V

10%

DISC

3%

MYLAR

50V

10%

DISC

DECOUPLER

50V

10%

DISC

CERAMIC

10%

DISC

10%

RADIAL

DECOUPLER

50V

10%

DISC

5%

MYLAR

100V

10%

20%

MYLAR

DECOUPLER

MONO

RADIAL

MONO

RADIAL

AXIAL

RADIAL

MONO

RADIAL

MONO

RADIAL

AXIAL

RADIAL

MONO

RADIAL

MONO

RADIAL

AXIAL

MONO

RADIAL

MYLAR

RADIAL

MONO

RADIAL

DISC

RADIAL

MYLAR

MONO

RADIAL

MONO

RADIAL

NON-POL

RADIAL

60

DESCRIPTION

100P

50V

10%

DISC

.1

50V

DECOUPLER

07UF

2.2

.1

1UF

.007

.1

07UF

1N910

INT*

30

16

1/0"

NPN

10V

ELECT

15V

ELECT

50V

DECOUPLER

50V

ELECT

50V

10%

50V

DECOUPLER

10V

PC

1"

PC

STEREO

TRANSISTOR

AXIAL

MYLAR

ELECT

MOUNT

MNT

JACK

RADIAL

MONO

RADIAL

MONO

RADIAL

MONO

RADIAL

DBL

RECEPT1CLE

RADIAL

NON-POL

RADIAL

ROW

SOCKET

W/SWTON

2N3900

R310

R311

R-160

R-218

3CJ0K

180K

10

2K 27K

100K 1 TURN

Inverter

3.01K

matched

10K 1 TURN

DAC

2.2M

3.0

matched

IK

0.02K

1.5K

2.2M

070

1M

301K

1M

2.2K

200K

15K

IK

7.5K

30

IK

1/0 W 5%

1/0K

5%

I/O W 5%

1/0W

5%

1/0W

5%

offset

1/0W

to

offset

1/0W

IK

1/0W

5%

1/0 W 1%

to

5%

1/0 W 1%

1/0W

5%

1/0W

IK

1/0W

5%

1/0W

5%

1/0W

5%

1/0W

5%

1/0 W 1?6

5%

1%

within

trimmer

within.t%

1%

TOP

ADJUST

trimmer

.1%

TOP

ADJUST

of

R313.

of

R310.

~

61

DESCRIPTION

1.2K

1/4W

596

IK

1/4W

5%

2K

1/<AV

2.2M

1.2K

IK

1/4W

300K

470

2.2M

2K

1/fW

IK

1MW

1.2K

910

1.2K

IK

1/4W

1.2K

IK

1/4W

27K

20K

100K

20K

15K

10K

15K

100K 1/4W 10K

330K

10K

1M

1MW

10K

1M

10K

47K

10K 47K 62K

47K

52.3K

IK

1/4W

20K

IK

1/4W

150K

100K

18K

1.2K

10K

1M

1/«W

10K 1/4W

330K

270K

1M

1/*W

10K

5%

1MW

5%

1/4W

5%

1/4W

5%

1/4W

5%

1/4W

5%

1/4W

5%

1/4W596

1/4W

5%

1/4W

5%

1V»W

5%

1/4W

5%

l/»W

5%

1/4W

5%

1/4W

596

1/4W

5%

1/4W

5%

1/4W

5%

1/4W

5%

1/4W

5%

1AW

1%

5%

1/4W

5%

1/4W

1/fW

1AW

1/*W

1/4W

5%

1/4W

5%

TM615A

62

DESCRIPTION

TB301

P-093

NON-DESIGNATED

J-082

100K 10K

100

10K

U7K

62K

33K

52.3K

33K

20K

470K

IK

4.7K

7

1M\V

lMW

1/4 W 5%

1MW

1/*W

1MW

1/4W

1MW

1/^W

1/*W

5%

1/4W

RT

5%

1%

5%

596

5%

ANGLE

COMPONENT

20

DUAL

INLINE

LOCKING

SOCKET

MOLEX

TM615A

63

sequential-circuits Sequential Circuits Multitrack SCI-multitrak-service-manual

Specifications and Main Features

Frequently Asked Questions

User Manual