Sony Seq-555es User manual

SERVICE

MANUAL

Inputs

Refer

to

RM-31

Service

Manual

issued

previously

for

information

of

remote

commander

supplied

with

this

set.

US

Model

Canadian

Model

AEP

Model

E

Model

SPECIFICATIONS

(0dBs

=0.775V)

level

LINE

IN

~10dBs

(245

mV)

AUX

1,2

|

-10dBs

(245

mV)

ie

Reference

input Input

:

Connector

impedance

erineet

Low

ae?

impedance

50

kohms

Phono

jack

50

kohms

Phono

jack

50

kohms

TAPE

1,

2

|

—10dBs

(245

mV)

Phono

jack

Outputs

(0dBs

=

0.775V)

Reference

|

Max.

output

|

Load

im-

output

Connector

level

pedance

level

LINE

-10dBs

+19dBs

;

|

out

(245

mV)

[91

V)

50

kohms

|

Phono

jack

REC

OUT/-10dBs

+19dBs

:

1,2

(245

mV)

(6.91)

50

kohms

|

Phono

jack

Frequency

response

MIC:

Adjusted

according

to

the

supplied

microphone

LINE:

10

Hz-

100

kHz

*3dB

Total

harmonic

distortion

LINE:

Less

than

0.006%

(1

V

output,

1

kHz)

Signal-to-noise

ratio

LINE:

More

than

97

dB

(A

network,

flat,

1V

output)

Center

frequencies

31.5Hz,

63Hz,

125Hz,

250

Hz,

500

Hz,

1kHz,

2kH

(for

both

g

analyzer)

Adjustable

range

+12dB

(2d

z,

4kHz, 8kHz,

16

kHz

raphic

equalizer

and

spectrum

L,

Ror

L+R

B

step),

+6dB

(1dB

step)

adjustable

Frequency

response

reverse

function

(CHARACTER

button)

Gain

0dB

Level

adjustable

range

(at

manu

TTT

One

ton

Pra

hay

|]

MICROFILM

al

operation)

Automatic

sound

field

adjustment

Measuring

level:

About

74dB

SPL

(at

microphone

position)

Measuring

time:

About

2

seconds

for

each

channel

after

level

reaches

the

measurable

level

Number

of

measurements

(averaged):

Max.

16

times

A:

for

rhythm

music

B:

for

female

vocal

C:

for

classical

and

mood

music

FLAT:

0dB

(flat

response)

Fixed

memories

SAFETY-RELATED

COMPONENT

WARNING!!

COMPONENTS

IDENTIFIED

BY

SHADING

AND

MARK

A

ON

THE

SCHEMATIC

DIAGRAMS,

EXPLODED

VIEWS

AND

IN

THE

PARTS

LIST

ARE

CRITICAL

TO

SAFE

OPERATION.

REPLACE

THESE

COMPONENTS

WITH

SONY

PARTS

WHOSE

PART

NUMBERS

APPEAR

AS

SHOWN

IN

THIS

MANUAL

OR

IN

SUPPLEMENTS

PUBLISHED

BY

SONY.

ATTENTION

AU

COMPOSANT

AYANT

RAPPORT

A

LA

SECURITE!

LES

COMPOSANTS

IDENTIFIES

PAR

UNE

TRAME

ET

UNE

MARQUE

/\

SUR

LES

DIAGRAMMES

SCHE-

MATIQUES,

LES

VUES

EXPLOSEES

ET

LA

LISTE

DES

PIECES

SONT

CRITIQUES

POUR

LA

SECURITE

DE

FONCTIONNEMENT.

NE

REMPLACER

CES

COMPOSANTS

QUE

PAR

DES

PIECES

SONY

DONT

LES

NUMEROS

SONT

DONNES

DANS

CE

MANUEL

OU

DANS

LES

SUPPLEMENTS

PUBLIES

PAR

SONY.

PROGRAM

EQUALIZER

SONY.

SEQ-555ES

General

Power

requirement

120

or

240

V

ac,

adjustable,

50/60

Hz

(AEP,

E

model)

120

V

ac,

60

Hz

(US,

Canadian

model)

Power

consumption

25

watts

AC

outlets

(US,

Canadian

only)

2

switched,

450

watts

max.

1

unswitched,

450

watts

max.

Dimensions

Approx.

430

x

105

x

275

mm

(wi/h/d)

(17

x

4Y,

x

107,

inches)

including

projecting

parts

and

controls

Weight

Approx.

5.2kg

(11

1b

802)

Approx.

6.5kg

(141b

502)

in

shipping

carton

FEATURES

The

SEQ-555ES

program

equalizer

is

a

system

control

center

that

provides

you

with

maximum

enjoyment

from

the

world

of

audio-video

presented

by

digital

audio

sources

such

as

CD

(Compact

Disc)

and

PCM

(Pulse

Code

Modulation),

and

by

Hi-fi

video.

It

also

works

as

an

ordinary

graphic

equalizer,

allowing

you

to

create

your

own

original

sound.

System

selector

for

the

AV

era

Enriched

input/output

terminals,

in

line

with

the

develop-

ment

of

systems

connected

with

AV

(Audio-Video)

units

*,

characterized

by

clear

image

and

excellent

tone

quality,

especially

with

a

Hi-fi

video

unit

connected.

Five

input

and

three

output

channels,

permitting

signal

switching

with

the

SEQ-555ES

main

unit

or

with

the

sup-

plied

remote

commander

RM-31,

are

provided.

*

As

no

video

signal

terminal

is

provided

in

the

SEQ-555ES,

it

is

not

possible

to

process

the

video

signal.

Automatic

equalization

The

flat

frequency

response

of

the

playback,

including

the

listening

room

and

speaker,

gives

a

reference

for

op-

timizing

adjustment

of

each

frequency

band

with

the

equalizer.

In

the

SEQ-555ES,

the

sound

field

is

measured

and

analyzed

by

the

built-in

microprocessor

combined

with

the

microphone,

supplied

especially

for

sound

field

measurement.

Adjustment

inverse

to

the

analysis

result

is

automatically

carried

out

so

that

the

frequency

response

becomes

flat

at

the

measuring

position.

Infrared

remote

commander

Each

time

adjustment

is

made

by

operating

the

equal-

izer

switches

and

controls,

the

effect

at

the

listening

position

must

be

checked

with

the

conventional

graphic

equalizer.

However,

ideally,

adjustment

should

be

carried

out

with

the

listener

actually

at

the

listening

position.

The

RM-31

remote

commander

makes

this

possible.

In

addition

to

on-band

equalizer

adjustment,

it

permits

on/off

control

of

the

power

supply

(US,

Canadian),

input

selection

recall

of

memorized

equalizer

curves

and

sound

volume

control.

Memory

permitting

immediate

recall

of

equalization

As

it

is

difficult

to

determine

the

most

appropriate

levels

of

equalizer

adjustment,

four

equalization

curves

of

dif-

ferent

types

of

music

are

stored

in

the

fixed

memory

of

the

SEQ-555ES.

Each

curve

can

be

recalled

by

one-touch

operation

of

the

corresponding

key.

Moreover,

four

memories

are

provided

for

storing

original

curves

made

by

the

user.

NOTES

ON

REPAIR

The

frequency

response

of

this

set

is

adjusted

to

match

the

microphone.

Therefore,

frequency

re-

sponse

adjustment

is

required

when

the

microphone

is

replaced.

(Refer

to

page

23,

Frequency

Response

Adjustment.)

REPAIR

CHECK

POINTS

1.

Before

checking

the

microcomputers,

be

sure

that

power

supply

voltage

is

being

properly

applied

and

that

the

clock

signal

is

being

applied.

Also

confirm

that

the

reset

is

high.

Microcomputers

A

(IC751)

and

C

(IC451)

are

controlled

by

microcomputer

B

(1C501).

.

Microcomputer

A

(IC751)

This

microcomputer

controls

key

input

and

re-

mote

control

input.

It

sends

the

data

to

micro-

computer

B

when

there

is

key

input

or

remote

control

input.

Checking

is

performed

as

follows.

@

Data

should

be

output

at

ay

when

the

power

supply

plug

is

pulled

and

then

plugged

in

again.

@

(5)

and

(16)

interrupt

signals

should

be

generated

when

any

key

is

pressed.

@

A

microcomputer

clock

signal

(4.19MHz)

should

be

being

applied

to

pin(7).

®

Confirm

that

pins

Q)

—

key

scan

signals

are

being

output’

(except

for

pins

and

@5)

@

should

be

high

level.

When

this

is

low,

the

key

scan

signal

is

not

output

and

key

input

is

not

accepted.

@

Pins

Q)

_

(4)

are

for

accepting

key

input,

so

check

that

the

key

scan

signal

of

any

appears

when

a

key

is

pressed.

bo

—2—

3.

Microcomputer

C

(IC451)

Microcomputer

C

controls

LED

display,

and

should

be

checked

when

there

are

any

abnormal-

ities

in

LED

display.

@

Pins

qd)

-

@)

are

input

pins

for

data

from

microcomputer

B.

Check

that

data

is

applied

to

these

pins

when

the

power

switch

is

turned

on

and

off.

@

Check

that

signals

are

being

output

from

output

pins

@)

-

:

4.

Microcomputer

B

(IC501)

This

contorls

microcomputers

A

and

C

and

other

IC’s.

Therefore,

this

microcomputer

should

also

be

checked

when

microcomputer

A

and/or

C

is

thought

to

be

defective.

MODE

L

IDENTIFICATION

—

Specification

Label

—

SONY:

PROGRAM

EQUALIZER

WLLL

LLL

SEQ-555ES

MODEL

NO.SEQ-555ES

US,

Canadian

model:

120V

60Hz

25W

AEP,

E

model:

120/220V

~

50/60Hz

25W

SAFETY

CHECK-OUT

(US

Model)

After

correcting

the

original

service

problem,

perform

the

following

safety

check

before

releasing

the

set

to

the

customer:

Check

the

antenna

terminals,

metal

trim,

‘‘metallized”’

knobs,

screws,

and

all

other

exposed

metal

parts

for

AC

leakage,

Check

leakage

as

described

below.

LEAKAGE

TEST

The

AC

leakage

from

any

exposed

metal

part

to

earth

ground

and

from

all

exposed

metal

parts

to

any

exposed

metal

part

having

a

return

to

chassis,

must

not

exceed

0.5mA

(500

microampers).

Leakage

current

can

be

measured

by

any

one

of

three

methods.

1.

A

commercial

leakage

tester,

such

as

the

Simpson

229

or

RCA

WT-540A.

Follow

the

manufacturers’

instructions

to

use

these

instru-

ments.

2.

A

battery-operated

AC

milliammeter.

The

Data

Precision

245

digital

multimeter

is

suitable

for

this

job.

3.

Measuring

the

voltage

drop

across

a

resistor

by

means

of

a

VOM

or

battery-operated

AC

volt-

meter.

The

“limit”

indication

is

0.75V,

so

analog

meters

must

have

an

accurate

low-

voltage

scale.

The

Simpson

250

and

Sanwa

SH-63Trd

are

examples

of

a

passive

VOM

that

is

suitable.

Nearly

all

battery

operated

digital

multimeters

that

have

a

2V

AC

range

are

Suitable.

(See

Fig.

A)

|

weary

Fig.

A.

Using

an

AC

voltmeter

to

check

AC

leakage.

we

0.15

pF

S154:

voltmeter

(0.75

V)

_—

To

Exposed

Metal

Parts

on

Set

AC

Earth

Ground

————__|

SEQ-555ES

LOCATION

AND

FUNCTION

OF

CONTROLS

Each

number

in

the

photo

is

keyed

to

descriptive

text.

6

Front

panel

FRONT

PANEL

@

POWER

switch

Press

this

switch

to

turn

the

power

on.

Press

it

again

to

turn

the

power

off.

@

EQ

(equalizer)

CHARACTER

switch

Press

this

switch

to

invert

“+”

and

‘“—”

of

the

equalizer

curve.

When

this

switch

is

pressed,

the

built-in

indicator

lights.

As

a

similar

effect

to

the

noise

reduction

system

is

ob-

tained,

hiss

noise

can

be

reduced

if

this

switch

is

used

at

playback.

As

tape

hiss

noise

is

a

high

frequency

component,

make

a

curve

which

gradually

rises

from

4kHz

and

higher

at

recording.

When

this

switch

is

pressed

in

playback

mode,

the

curve

is

inverted

to

that

at

recording,

and

hiss

noise

is

reduced.

At

recording

At

playback

Signal

level

ee

Signal

level

When

the

equalization

curve

is

inverted,

the

actual

fre-

quency

response

of

the

listening

point

is

displayed.

©

EQ

(equalizer)

LEVEL

selectors

These

buttons

select

the

equalizer

curve

level

adjusting

ranges.

+6

dB:

Fine

correction

in

1dB

steps.

When

this

button

is

pressed,

the

built-in

indicator

lights.

+12dB:

Correction

in

2dB

steps.

When

this

button

is

Pressed,

the

built-in

indicator

lights.

When

the

range

is

switched

to

+12dB

while

indication

is

in

the

+6dB

range,

—1dB

is

added

to

the

odd

setting

in

the

positive

(+)

and

the

negative

(—)

directions.

Wr

migii

Tigi

Hida

<P

318

63128

250

800

1k

2k

4k

ak

Yk

He

©?

+12

dB

indication

y

When

a

point

over

8dB

is

included

in

the

indication

of

12

dB,

the

+6

dB

button

is

not

accepted

even

if

it

is

press-

ed,

and

the

indicator

built

in

the

+6dB

button

blinks.

When

the

BEEP

switch

(rear

panel)

is

ON,

a

beep

tone

is

emitted,

notifying

key-in

operation

is

not

accepted.

@

EQ

(equalizer)

MODE

selectors

These

buttons

select

the

equalization

modes:

simul-

taneously

in

left

and

right

channels,

and

separately.

L:

Press

this

button

to

equalize

the

left

channel

inde-

pendently.

The

built-in

indicator

lights.

In

the

equalizer

display,

only

the

yellow

indicators

are

lit.

R:

Press

this

button

to

equalize

the

right

channel

inde-

pendently.

The

built-in

indicator

lights.

Orly

the

red

indicators

are

lit

in

the

equalizer

dis-

play.

—4—

L+R:

Press

this

button

to

equalize

left

and

right

channels

simuitaneously

at

the

same

step.

The

built-in

indicator

lights.

In

the

equalizer

display,

both

yellow

(left

channel)

and

red

(right

channel)

indicators

are

lit.

@

UP/DOWN

(equalizer

level

adjust)

buttons

These

buttons

correct

each

frequency

band

of

the

graphic

equalizer

display.

@

Graphic

equalizer

display

This

indicates

the

curves

of

automatic

equalization

and

adjustment

with

the

equalizer.

The

yellow

indicator

shows

the

left

channel

level,

and

the

red

the

right

chan-

nel

level.

One

graduation

is

1dB

when

the

+6dB

button

of

EQ

LEVEL

selector

is

being

pressed,

and

2dB

when

the

+12dB

button

is

being

pressed.

@

LEVEL

indicator

This

shows

the

output

level

of

the

LINE

OUT

jacks.

Usually,

set

so

that

all

the

indicators

are

lit

(dB

gain).

This

shows

the

sound

volume

when

the

SEQ-555ES

is

used

as

an

audio

system

selector.

©

AEQ

(automatic

equalization)

indicator

This

indicator

blinks

when

the

level

is

too

low

in

the

sound

field

measurement

and

a

signal

of

1kHz

does

not

reach

the

—5dB

white

line.

In

this

case,

increase

the

amplifier

volume

gradually

so

that

the

signal

ap-

proaches

the

white

line.

This

indicator

remains

lit

for

one

minute

after

the

sound

field

is

measured

by

pressing

the

START

button.

If

the

START

button

is

pressed

again

while

this

indicator

is

lit,

the

value

averaged

with

the

last

measurement

is

input

as

a

data.

©

REAL

TIME

ANALYZER

display

This

is

a

10-division

real

time

analyzer,

and

the

frequen-

cy

band

is

the

same

as

that

of

the

graphic

equalizer.

It

indicates

the

acoustic

energy

of

sound

field

picked

up

by

the

microphone

at

sound

field

correction,

and

the

acoustic

energy

of

left

and

right

channels

of

program

source

at

adjustment

with

the

equalizer.

The

—5dB

white

line

(thick

line)

shows

the

optimum

level

at

equalization.

For

music

playback,

an

environment

where

the

external

noise

measured

at

sound

field

correc-

tion

is

lower

than

—5dB

is

required.

@

FIXED

MEMORY

keys

These

keys

access

the

equalization

curves

for

three

kinds

of

music

memorized.

When

the

key

is

pressed,

the

corresponding

built-in

indicator

fights.

A:

Effective

for

jazz

and

rock

B:

Effective

for

female

vocal

C:

Effective

for

classical

and

mood

music

FLAT:

The

equalizer

frequency

response

becomes

flat.

@

INPUT

SELECTOR

buttons

These

buttons

select

the

input

required.

The

indicator

of

the

pressed

button

lights.

SEQ-555ES

LINE:

Press

this

button

to

listen

to

the

program

source

selected

by

the

amplifier

connected

to

the

LINE

IN

jacks.

AUX

1,

2:

Press

these

buttons

to

listen

to

the

program

source

connected

to

AUX

1

and

2

jacks.

TAPE

1:

Press

this

button

to

listen

to

the

tape

deck

connected

to

the

TAPE

1

jacks.

TAPE

2:

Press

this

button

to

listen

to

the

tape

deck

connected

to

the

TAPE

2

jacks.

@®

EQUALIZATION

selector

keys

These

keys

select

the

output

to

be

equalized.

The

indicator

of

the

pressed

key

lights.

AEQ:

Press

this

key

to

carry

out

equalizer

adjustment

after

adjustment

of

sound

field.

Press

the

AEQ

key

for

normal

playback

through

speakers.

LINE

OUT:

Press

this

key

to

equalize

the

program

source

to

be

listened

to.

As

sound

field

correction

is

not

added,

press

the

LINE

OUT

button

for

playback

through

headphones

or

for

comparing

two

pairs

of

speakers.

OFF:

Press

this

key

when

making

no

equalization.

When

the

OFF

key

is

pressed,

the

indicator

and

graphic

equalizer

display

the

equalization

go

out.

REC

OUT:

Press

this

key

to

equalize

only

the

signal

to

be

recorded,

without

equalizing

the

current

program

_

source.

Press

the

REC

OUT

key,

and

select

the

pro-

gram

source

to

be

recorded

by

pressing

the

cor-

responding

button

of

the

REC

OUT

SELECTOR.

®

REMOTE SENSOR

The

infrared

beam

transmitted

by

the

supplied

remote

commander

is

received

here.

@®

Remote

control

signal

indicator

This

lights

when

the

power

cord

is

connected

to

a

wall

outlet,

indicating

the

unit

is

ready

to

accept

the

remote

control

signal.

It

goes

out

when

the

POWER

switch

is

pressed

to

turn

on.

It

lights

when

the

remote

control

signal

is

received.

@®

MEMORY

keys

Press

these

keys

to

memorize

the

equalization

curves.

SET:

Press

this

key

after

the

equalization

curve

to

be

memorized

is

determined.

The

built-in

indicator

lights

for

a

few

seconds.

Memorize

the

curve

during

this

period

by

pressing

the

corresponding

[1]

-

[4}

keys.

[4]:

Press these

keys

to

memorize

the

required

equalization

curve,

or

recall

the

memorized

curve.

@

REC

OUT

SELECTOR

buttons

These

buttons

select

the

program

source

applied

to

the

REC

OUT

jacks

on

the

rear

panel.

LINE

OUT:

Press

this

button

to

record

the

current

sound

as

it

is.

LINE:

Press

this

button

to

record

the

source

selected

by

the

amplifier

connected

to

the

LINE

IN

jacks.

—5—

AUX

1,

2:

Press

this

button

to

record

from

the

program

source

connected

to

the

AUX

jacks.

TAPE

1

—

2:

Press

this

button

to

copy

from

tape

deck

1

to

tape

deck

2.

TAPE

2

—

1:

Press

this

button

to

copy

from

tape

deck

2

to

tape

deck

1.

@®

AUTO

EQ

MIC

jack

(minijack)

Connect

the

supplied

microphone

for

sound

field

meas-

uring

to

this

jack.

Rear

panel

The

photo

shows

type

2

model.

(41)

21

mm

Ob

@

REAR

PANEL

@

LINE

IN

jacks

Connect

these

jacks

to

the

tape

output

jacks

of

the

amplifier.

@

LINE

OUT

jacks

Connect

these

jacks

to

the

tape

input

jacks

of

the

amplifier.

@

AUX

1,

2

(auxiliary

1,

2)

jacks

Connect

these

jacks

to

the

audio

output

jacks

of

a

CD

player,

etc.

@

TAPE

RECORDER

1

REC

OUT

jacks

When

only

one

tape

deck

is

connected

for

recording,

connect

these

jacks

to

the

fine

input

jacks

of

the

deck.

@

TAPE

RECORDER

1

TAPE

jacks

When

only

one

tape

deck

is

connected

for

playback,

con-

nect

these

jacks

to

the

line

output

jacks

of

the

deck.

To

play

a

Hi-fi

video,

connect

these

jacks

to

the

audio

line

output

jacks

of

the

video.

@

TAPE

RECORDER

2

REC

OUT

jacks

When

two

tape

decks

are

connected

for

recording

in

the

second

deck,

connect

these

jacks

to

the

line

input

jacks

of

the

deck.

@

TAPE

RECORDER

2

TAPE

jacks

When

two

tape

decks

are

connected

for

playing

in

the

second

deck,

connect

these

jacks

to

the

line

output

jacks

of

the

deck.

@®

AUTO

EQ

START

button

Press

this

button

to

generate

a

pink

noise

from

the

built-

in

pink

noise

generator

for

sound

field

adjustment.

When

the

sound

field

measuring

microphone

is

connected,

this

button

can

be

actuated.

The

pink

noise

is

radiated

from

the

left

channel

speaker,

and

then

the

right

channel

speaker.

This

pink

noise

is

picked

up

by

the

microphone

and

input

as

a

sound

field

data.

@®

Level

UP/DOWN

button

When

the

SEQ-555ES

is

used

as

a

system

selector,

this

button

is

used

for

volume

adjustment.

The

amplifier

volume

should

be

set

to

an

attenuation

of

20-30dB.

27

(4)

@

BEEP

(remote

control

signal)

switch

When

this

switch

is

set

to

the

ON

position,

a

beep

tone

is

emitted

when

the

button

of

the

supplied

remote

com-

mander

is

pressed.

If

a

point

of

over

8dB

is

included

in

the

indication

of

+12dB,

switching

to

+6dB

is

not

ac-

cepted

and

the

beep

tone

is

generated

even

if

the

+6dB

button

is

pressed.

Set

this

switch

to

the

OFF

position

when

the

beep

tone

is

unnecessary.

@

AC

OUTLETS

(US,

Canadian

only)

These

outlets

are

used

for

connecting

the

power

cords

of

compact

disc

player,

tuner,

tape

deck

and

other

pro-

gram

sources.

When

the

power

cord

of

the

equipment

to

be

connected

has

a

white

mark

indicating

the

polarity,

connect

the

power

cord

so

that

the

white

mark

comes

to

the

left

side

of

the

outlet.

SWITCHED:

This

outlet

interlocks

with

the

POWER

switch

of

the

program

equalizer:

the

power

on/off

of

the

connected

equipment

can

be

controlled

by

the

POWER

switch

of

the

program

equalizer,

when

the

power

switch

of

the

connected

equipment

is

set

to

ON.

This

is

convenient

when

the

program

source

to

be

played

frequently

is

connected

to

this

outlet.

The

total

power

consumption

is

450W.

UNSWITCHED:

This

outlet

provides

power

irrespective

of

whether

the

POWER

switch

of

the

program

equalizer

is

ON

or

OFF.

Connect

equipment

with

a

power

consumption

of

450W

maximum

to

this

outlet.

@

Power

cord

—6§—

AUTO

ADJU

&

a

7

(HHo

Press

and

&

Set

t

than

Conn

Place

Press

Pir

sys

inc

red

cat

2s

rig

Even

main

After

butto

Repe

Each

tin

cessor

measure

Press

th

data.

Q-555ES

SEQ-555ES

n

source

LINE

IN

program

ipe

deck

ipe

deck

justment

through

n

source

ress

the

dphones

on.

ator

and

alization

nal

to

be

program

the

pro-

the

cor-

TOR.

1

remote

iO

a

wall

2

remote

witch

is

»

control

curves.

ve

to

be

ndicator

e

during

g

4)

-

(4)

required

|

curve.

2d

to

the

it

sound

ected

by

KS.

AUX

1,

2:

Press

this

button

to

record

from

the

program

source

connected

to

the

AUX

jacks.

TAPE

1

—

2:

Press

this

button

to

copy

from

tape

deck

1

to

tape

deck

2.

TAPE

2

—

1:

Press

this

button

to

copy

from

tape

deck

2

to

tape

deck

1.

@®

AUTO

EQ

MIC

jack

(minijack)

Connect

the

supplied

microphone

for

sound

field

meas-

uring

to

this

jack.

Rear

panel

The

photo

shows

type

2

model.

@®

AUTO

EQ

START

button

Press

this

button

to

generate

a

pink

noise

from

the

built-

in

pink

noise

generator

for

sound

field

adjustment.

When

the

sound

field

measuring

microphone

is

connected,

this

button

can

be

actuated.

The

pink

noise

is

radiated

from

the

left

channel

speaker,

and

then

the

right

channel

speaker.

This

pink

noise

is

picked

up

by

the

microphone

and

input

as

a

sound

field

data.

@®

Level

UP/DOWN

button

When

the

SEQ-555ES

is

used

as

a

system

selector,

this

button

is

used

for

volume

adjustment.

The

amplifier

volume

should

be

set

to

an

attenuation

of

20-30dB.

REAR

PANEL

@

LINE

IN

jacks

Connect

these

jacks

to

the

tape

output

jacks

of

the

amplifier.

@

LINE

OUT

jacks

Connect

these

jacks

to

the

tape

input

jacks

of

the

amplifier.

@

AUX

1,

2

(auxiliary

1,

2)

jacks

Connect

these

jacks

to

the

audio

output

jacks

of

a

CD

player,

etc.

&

TAPE

RECORDER

1

REC

OUT

jacks

When

only

one

tape

deck

is

connected

for

recording,

connect

these

jacks

to

the

tine

input

jacks

of

the

deck.

@

TAPE

RECORDER

1

TAPE

jacks

When

only

one

tape

deck

is

connected

for

playback,

con-

nect

these

jacks

to

the

line

output

jacks

of

the

deck.

To

play

a

Hi-fi

video,

connect

these

jacks

to

the

audio

line

output

jacks

of

the

video.

@®

TAPE

RECORDER

2

REC

OUT

jacks

When

two

tape

decks

are

connected

for

recording

in

the

second

deck,

connect

these

jacks

to

the

line

input

jacks

of

the

deck.

@

TAPE

RECORDER

2

TAPE

jacks

When

two

tape

decks

are

connected

for

playing

in

the

second

deck,

connect

these

jacks

to

the

fine

output

jacks

of

the

deck.

@

BEEP

(remote

control

signal)

switch

When

this

switch

is

set

to

the

ON

position,

a

beep

tone

is

emitted

when

the

button

of

the

supplied

remote

com-

mander

is

pressed.

If

a

point

of

over

8dB

is

included

in

the

indication

of

+12dB,

switching

to

+6dB

is

not

ac-

cepted

and

the

beep

tone

is

generated

even

if

the

+6dB

button

is

pressed.

Set

this

switch

to

the

OFF

position

when

the

beep

tone

is

unnecessary.

@

AC

OUTLETS

(US,

Canadian

only)

These

outlets

are

used

for

connecting

the

power

cords

of

compact

disc

player,

tuner,

tape

deck

and

other

pro-

gram

sources.

When

the

power

cord

of

the

equipment

to

be

connected

has

a

white

mark

indicating

the

polarity,

connect

the

power

cord

so

that

the

white

mark

comes

to

the

left

side

of

the

outlet.

SWITCHED:

This

outlet

interlocks

with

the

POWER

switch

of

the

program

equalizer:

the

power

on/off

of

the

connected

equipment

can

be

controlled

by

the

POWER

switch

of

the

program

equalizer,

when

the

power

switch

of

the

connected

equipment

is

set

to

ON.

This

is

convenient

when

the

program

source

to

be

played

frequently

is

connected

to

this

outlet.

The

total

power

consumption

is

450W.

UNSWITCHED:

This

outlet

provides

power

irrespective

of

whether

the

POWER

switch

of

the

program

equalizer

is

ON

or

OFF.

Connect

equipment

with

a

power

consumption

of

450W

maximum

to

this

outlet.

@

Power

cord

—6—

AUTOMATIC

SOUND

FIELD

ADJUSTMENT

Amplifier

ee

|

@--

000+

0

6!

AEQ

indicator

1

Press

the

POWER

switches

of

the

program

equalizer

and

amplifier.

2

Set

the

volume

level

of

the

amplifier

slightly

higher

than

that

for

normal

listening.

Connect

the

microphone

to

the

MIC

jack.

Place

the

microphone

at

your

listening

position.

5

Press

the

START

button.

Pink

noise

is

first

emitted

from

the

left

speaker

system

and

its

level

gradually

increases.

The

AEQ

indicator

flickers.

When

the

pink

noise

level

reaches

the

reference

level

of

-5dB,

the

AEQ

indi-

cator

steadily

lights

and

noise

is

emitted

for

about

2

seconds.

Then,

pink

noise

is

emitted

from

the

right

speaker

system

for

about

2

seconds.

6

Even

when

pink

noise

stops,

the

AEQ

indicator

re-

mains

lit

for

about

1

minute.

After

the

AEQ

indicator

goes

out,

press

the

START

button

again.

7

Repeat

step

6

at

least

once

more.

mw

Each

time

the

data

is

obtained,

the

built-in

micropro-

cessor

analyzes,

compensates

and

memorizes

the

measured

data.

Press

the

AEQ

key

to

recall

the

compensated

sound

field

data.

SEQ-555ES

The

graphic

equalizer

display

indicates

the

sound

field

adjustment

curve

at

the

place

at

which

the

microphone

is

placed.

After

second

adjustment,

the

measured

data

is

added

with

the

To

carry

out

automatic

sound

field

adjustment

effec-

tively,

obtain

the

data

at

least

3

times

at

the

same

posi-

tion.

Data

can

be

compensated

and

measured

up

to

16

times.

More

than

16

measurements

cannot

be

accessed

while

the

AEQ

indicator

remains

lit.

To

resume

adjustment,

wait

until

the

AEQ

indicator

goes

off

or

turn

the

power

off

and

on

again.

When

automatic

sound

field

adjustment

is

completed,

return

the

amplifier

volume

contro!

to

the

normal

listen-

ing

position.

To

observe

the

actual

sound

characteristics

at

your

listening

position

Press

the

CHARACTER

button.

The

equalization

curve

is

inverted

to

display

the

actual

sound

characteristics

at

your

listening

position.

With

this

operation,

you

can

see

the

sound

characteristics

of

the

audio

system

and

listening

room.

Notes

@

Be

sure

to

carry

out

automatic

sound

field

adjustment

before

playing

back

the

sound

source.

If

the

START

but-

ton

is

pressed

while

playing

the

sound

source,

the

acoustic

energy

remaining

from

the

played

sound

source

is

added

to

the

pink

noise

and

correct

sound

field

adjustment

is

not

possible.

@

When

the

level

of

the

emitted

pink

noise

is

insuffi-

cient,

the

AEQ

indicator

remains

flickering.

In

this

case,

increase

the

amplifier

volume

level.

SEQ-555ES

1-1.

SECTION

1

OUTLINE

BLOCK

DIAGRAM

CNJ353~3

@

TAPE

|

CNJ354-3

iC

TAPE2

(7)

TAPE|

INPUT

REC

OUTPUT

1(8)

(6)

TAPE

2

INPUT

REC

OUTPUT

2(9)

CNU35I~1

e

LINE

IN

(2)

LINE

INPUT

LINE

OUTPUT(1O)

CNJ352~1

AUXI

CNU352-3

AUX2

(4)

AUX!

INPUT

(3)

AUX2

INPUT

FUNCTION

SWITCH

1C

351

J301

mo

(3)

MIC

AMP

(1)

iC

201

SEQ-555ES

(5)

LINE

AMP

(7)

(14)

LINE/PINK

NOISE

SELECT

LINE/PINK

NOISE

Dao,

(setter)

<8

>

STEP

(2)

VOLUME

@)

1C

103

SV

0116

LINE

MUTE

CD

8-

(r\

alle

)

LINE

MUTE

Qt

LINE

MUTE

B+

9102

switcHING

Quis

ila

LINE

MUTE

IC

101

1c

102¢172)

Pp-o—

PINK

NOISE

CH

Osc

EQ

AMP

(i)

3)

£0

amp

(@)

1C102

(1/2)

10106

se

10105

SWITCHING

LINE

PINK

NOISE)

(IE

@108

SWITCHING

EO

VOLUME

(LINEZEINK

Novse)

1108

—

112

de.

TON

BEEEET,

SWITCHING

C?

SWITCHING

RESONANCE

CIRCUIT

(LEVEL)

5

peaicyeaioes

Ic

107

NSELECT

ay

7

4

ey

9109

SWITCHING

(LEVEL

)

SELECT

aior

sp

ING

ray,

SN

(LD

MUTING

$|—47

,

701

—

707

(POWER,

FUNCTION

SWITCH,

OTHER}

0401

REMOTE

SENSER

REMOTE

CONTROL

PRE

AMP

1C40t

»

BANDPASS

LOGARITHM

(2)

EQ

AMP

(1)

ae

RECT

MULTI

PLEXER

AMP

1518

1c513—518

Ic519—523

ie

soe

6

Q105

——gi04

\e;

SWITCHING

(LINE/MIC

SELECT),

Q5i2

D

MICRO

COMPUTER

1505

INPUT/OUTPUT

PORT

F

Ch

(INVERTER)

My,

|

1C508,

509

Q513

LCD

MUTE

(j~

A/D

CONVERTER

1C507

(IO)SENS

INPUT

$

05

OUTPUT

PORT

0

08

A

MICRO

COMPUTER

CLOCK

OSC

1504

(1/2)

T501

04(2)

(2)

SEQ-55

QUT

Nt

QlI9

REC

MUTE

Qus

REC

MUTE

=

Q120

7

REC

MUTE

BUFFER

AMP

(I)

MULTI

PLEXER

Ie510(1/2)

1c512

VOL.R

Q30%

DECODER

C

MICRO

COMPUTER

(20

10.456

1451

(1)

39

(2)

|

DECODER

INDICE

458

(BUZZER)

8

41

Ic

Ic4

(S)

26

(16)

|

DECODER

INDICE

RESET

SWITCHING

RESET

—

29

1454

ICé

esoatiey

|

RESET

extar

if

TO

MICRO

COMPUTER

gy

VOL.R

SECTION

522!

“

{

VOL.R

Q5i9

B+

:

switching

RYSO!

9301,

TO

ANALOG

WOL.

REG,

ON

e+

TO

MICRO

COMPUTER

SECTION

B+

POWER

TRANSFORMER

VOL.

REG,

RECT

Q5i7,518

0533

3

Hs

SEQ-555ES

.

(5)

LINE

AMP

(7)

{C

10t

LINE/PINK

NOISE

SELECT

1€

1021/2)

PINK

NOISE

“LT

SPV

TSSEINE

MUTE

ry)

aie

osc

aA)

AJ,

ws

LINE

MUTE

1C10211/2)

nibs

SWITCHING

B-

(LINEZPINK

No¥S

SELECT

ani

LINE

MUTE

B+

9108

‘>

EQ

VOLUME

STLINEY

PINK.

NOISE

Q102

—

switcHine

Quis

Qiia

on

my

SELECT

)

LINE/PINK

NOISE

LINE

MUTE

1C

108

—

Il2

-_

)

SELECT

aa

‘A101

SWITCHING

S

LEVEL

iene

C107

SELECT)

:

SD

i

@

7

et]

0109

SWITCHING

(SEVEN)

8)

SELECT

O07

Cp

ray,

D

MICRO

COMPUTER

@.

{

6

~

1C505

INPUT/OUTPUT

Q105

Q104

unl)

PORT

F

SWITCHING

(LINE/MIC

SELECT).

Q5le

SWITCHING

(INVERTER)

ay

BANDPASS

LOGARITHM

A/D

BUFFER

(2)

£0

AMP

(1)

FILTER

RECT

MULTI

PLEXER

AMP

CONVERTER

(I0)SENS

INPUTS

042)

AMP

1C518

1C513—

518

C519

—523

1508,

509

16506

1c

507

Q513

Ps

LCD

MUTE

(97

9

A

MICRO

COMPUTER

RAM

We

—

1c502

09

f\

BZ501

(BUZZER)

RESET

SWITCHING

Q516

Q5i4

}

C

MICRO

COMPUTER

RESET

1C504(1/2)

CLOCK

OSC

1€504

(1/2)

B+

VOL.

REG,

Q521

TO

MICRO

COMPUTER

SECTION

B+

TSOH

POWER

TRANSFORMER

TO

MICRO

COMPUTER

SECTION

B+

Q519

RY501

B+

o520

SWITCHING

79

ANALOG

(RESET)

|

=

(2)

@

6

1C503

i

I

8-

IC510(1/2)

CNBC!

REC

OUTI

SWITCHING

REC

OUT}

©

_cNu351~4

10353

REC

OUT2

gj)

cN381-3

LINE

OUT

QUIZ

a

Gig

REC

MUTE

oy

e~

oO

QHge

REC

MUTE

ne

Q120

8

REC

MUTE

LCD

DRIVE

C5172)

LCO

DRIVE

ICS1O{1

72)

LCD

DRIVE

IC5I(/2)

MULTI

PLEXER

1C512

INDICATOR

DRIVE

1C455,

457

VOL

REG,

0303,

304

LED

INDICATOR

T80l

POWER

TRANSFORMER

AC

IN

SEQ-555ES

SECTION

2

CIRCUIT

DESCRIPTION

CIRCUIT

DESCRIPTION

11

bit

Control

Data

Structure

This

model

employs

4

microcomputers,

to

control

11

10

3

2

1

9

8

7

6

5

4

automatic

acoustic

compensation

and

frequency

rs

oe

equalizer

adjustment,

etc.

F3

TaN

data

The

operation

of

each

section

is

described

below.

bit

: ;

INPUT

SECTION

position

:

=|

|

position

LD

ee

6

5

3

2

1

IC

351,352

(CX-7977

are

used

for

input

source

(LINE

:

IN,

AUX,

etc.)

selection.

SS

0

SO

ee

|

20

PE

These

IC’s

are

controlled

by

data

from

the

micro-

L

D2)

ome

Rs

“0;

3

IZ

jo

0

1

computers.

R

1

0}

joutputE?

}1

0

ae

|

eee

Their

functions

and

features

are

explained

below.

L+R

!/1-

1]

|

output

F:

1 1

I,

|0

1

2

4

CX-7977

Ir

/1

0

0O

Features:

This

is

a

semiconductor

switch

with

low

Ie

}1

O

1

distortion

ratio

containing

two

matrix

circuits

with

6

inputs

and

3

outputs

each,

and

control

by

digital

signals

is

possible.

Control

is

done

by

11

bit

or

8

bit

serial

data

from

a

microcomputer,

etc.

and

on

this

model

it

is

performed

by

11

bit

data.

F,

and

F3

outputs

are

interlocked,

and

Is

input

signal

is

not

output

from

F2.

Ig

input

signal

is

not

output

from

F3.

Both

L

and

R

channels

can

be

used with

this

ASP

IC,

but

on

this

model,

L

and

R

use

one

each,

and

the

Functions:

equalizer

ON/OFF

matrix

is

formed.

I~6

(@~@,

@~

@)

Audio

signal

input

On

this

model

the

connections

are

as

follows.

(6

inputs

)

x

2

I,

LINE

IN

F

F,~3(®~

@,

@~@)

Audio

signal

output

I,

AUX,

Fig

to

equalizer

circuit

(3

outputs)

x

2

input

CS

(@)

_—

Signal

chip

selection

pin,

I;

AUX,

F,

REC

OUTi

selects

when

the

9th

bit

of

Iq

from

equalizer

F3;

REC

OUT2

serial

data

is

the

same

level

circuit

output

as

the

CS

pin.

I;

TAPE2

F,,

to

buffer

amp

“QO”

=

Vss

(@),

Ig

TAPE1

“1”

OPEN

or

Vpi

(

4

)

M/S

(4)

Serial

data

input

mode

switch

pin,

11

bits

for

OPEN

or

VoL.

Vo.

(G3)

Power

supply

(5V_

higher

than

Vss)

Vss

(@))

Power

supply

(-14V)

Clock

(4)

Clock

signal

input

pin;

takes

in

data

at

signal

rise.

Data

(46)

Serial

data

input

pin.

Strobe

(G7)

Strobe

signal

input

pin;

latches

data

taken

into

the

IC.

Lvref

(48)

Sets

control

signal

(clock,

data,

strobe)

input

level.

Von

(@9)

Power

supply

(+14V).

input

output

Data

taken

into

the

IC

is

input

serially

from

the

MSB

(most

significant

bit).

The

data

is

taken

into

the

IC

shift

register

at

signal

rise,

the

clock

signal

is

stopped

after

input,

the

strobe

signal

pulse

rises

and

data

is

transmitted

to

the

latch.

The

contents

of

the

data

determine

which

switch

goes

on

or

off.

—1

1—

SEQ-555ES

to

equalizer

circuit

Sg

switch

LINE

IN

AUX,

from

equalizer

circuit

TAPE2

TAPE]

to

LINE

OUT

REC

OUT2

REC

OUT1

F,

and

F3

are

interlocked.

EQUALIZER

CIRCUIT

ICios

Ry20

13k

Crip

220P

controlled

by

microcomputer

Cros

CX-7976

resonance

circuit

63H2

resonance

circuit

31.5Hz

The

equalizer

circuit

is

structured

as

shown

in

the

above

diagram,

and

actually,

four

IC’s

are

connected

parallel

to

ICj93

and

determine

the

frequencies.

These

IC’s

are

controlled

by

microcomputer.

In

the

example

above,

many

switches

and

resistors

are

connected

inside

ICj9g,

and

because

it

is

con-

nected

to

the

resonance

circuits

via

these

resistors,

and

the

NF

circuit

is

connected

to

these

resonance

circuits

when

it

is

on

the

UP

side,

the

frequency

component

output

gain

becomes

high.

When

DOWN,

these

resonance

circuits

connect

to

the

attenuation

circuit,

so

the

frequency

component

gain

drops.

ICiog

is

controlled

by

microcomputer,

and

depending

on

the

data

sent

from

the

microcomputer,

can

control

only

Q;

or

Qz,

or

both.

The

equalizer

frequency

is

controlled

by

these

combi-

nations.

+6dB

or

+12dB

switching

is

done

by

ICj97.

When

ICjo7

internal

switch

is

off,

it

is

+12dB,

and

+6dB

when

on.

CX-7976

Features:

This

is

a

2

channel

independent

variable

2dB

step

electronic

volume

for

low

dis-

tortion

equalizer,

containing

two

circuits

which

can

obtain

+12dB

attentuation.

Control

is

done

by

11

bit

serial

data

from

a

microcomputer,

etc.

Functions:

Qi.

(@,

@,

&,

@

)

These

pins

are

connected

to

L

and

R_

channel

resonance

circuits.

UP

(@,

@

)

Connected

to

op

amp

invert-

ed

input.

DOWN

(@,

@)

Connected

to

op

amp

non-

inverted

input.

Serial

data

bits

9,

10

and

11

are

all

selected

at

the

same

time

as

pins

CS,,2,3

level.

“<Q”

=

Vss

“1”?

=

OPEN

or

Voi

CSi,2,3

(©,

©,

@)

VDL

(@)

Power

supply

(5V

higher

than

Vss).

Vss

(@)

Power

supply

(-14V).

CLOCK

(

@)

Clock

signal

input

pin.

Data

(dad)

Serial

data

input

pin.

Strobe

(@)

Latches

data

taken

into

the

IC

at

signal

rise.

Lyref

(4)

Sets

control

signal

(clock,

data,

strobe)

input

level.

Vpp

(@)

Power

supply

(+14V).

The

11

bit

serial

control

data

is

input

to

the

IC

from

the

MSB

(most

significant

bit).

Data

is

taken

into

the

IC

shift

register

at

clock

signal

rise.

After

data

is

taken

in,

the

clock

signal

is

stopped,

and

the

strobe

signal

rises.

The

strobe

signal

transmits

the

data

to

the

latch,

and

the

data

contents

determine

which

switch

is

turned

on

or

off.

connected

to

resonance

circuit

Q

1

UP

Q

}

connected

to

resonance

circuit

Q,

DOWN

Lyvref

Strobe

Data

CLOCK

Control

Data

Structure

ll

ol

5

4 3

2

1

|

0

9

8

7 6

esfesfes[e[-[e]:

[

mae

position

Bi

position

ia

6 5

4321

no

change

no

change

|

0

—12dB}

0110

Qi

01

—10

0101

Q2

10

—8

0100

Q+Q:

[11

—6

—4

0010

~—2

0001

0

0000

+

2

ool

+4

1010

+6

1011

+

8

1100

+10

1101

+12

1110

input

=>

SEQ-555ES

AUTOMATIC

ACOUSTIC

COMPENSATION

Pink

noise

is

output

from

the

oscillator

inside

this

set

and

radiates

from

the

speaker.

These

signals

are

input

at

the

microphone,

divided

into

10

bands,

measured

and

analyzed,

then

equalization

is

applied

to

flatten

frequency

response.

The

signal

input

from

the

MIC

jack

is

amplified

at

the

ICy9;

mic

amp

circuit.

(The

frequency

response

is

corrected

at

the

same

time.)

The

amplified

signal

is

applied

to

ICs;g.

The

ICs)

output

signal

is

applied

to

the

frequency

filter

cir-

cuits,

then

is

rectified

at

the

rectification

circuit,

passes

the

multiplexer

circuit

and

is

digitalized

at

the

A/D

converter,

and

is

memorized

in

the

RAM

by

microcomputer

B.

The

equalizer

is

controlled

by

this

memorized

con-

tent

to

flatten

frequency

response.

FILTER

CIRCUIT

IC,

rectification

circuit

In

the

circuit

above,

the

RLC

resonance

circuit

is

formed

by

Q1,

C2,

C3,

R2

and

R3.

IC,,

Cy,

Ri

and

the

resonance

circuit

form

a

band

pass

filter.

C2, C3,

Ro

and

R3

determine

the

center

frequency.

a

1

10

pe

J

RIRICIC

After

passing

the

filter

circuit,

it is

converted

to

DC

voltage

by

the

rectification

circuit.

This

DC

voltage

is

applied

to

the

A/D

converter

via

the

multiplexer.

SEQ-555ES

ICsog,509

(MULTIPLEXER)

This

is

an

input

selection

IC,

and

determines

the

to

be

selected

by

combinations

of

signals

of

pins

@,

@

and

@.

The

truth

table

is

given

below.

©

|

@

|

@

|

@

onPin

INH

A

B

C

Ee

Sg

2)

6.

Sse

-@

ol)

ee

1

Be}

te.

SS

Pate.

|e

L

|

L|H

|

H

|]

3

L}|H]|LI]

LI

4

L

|

AH]L]

Hi]

5

L

|

H/|

Hj]

Li]

6

L

H H

H

7

DC

voltage

of

the

frequency

selected

at

the

multi-

plexer

is

sent

to

the

A/D

converter

via

the

logarithmic

amp.

ICsos

(MICROCOMPUTER

D)

The

main

functions

of

this

microcomputer

are

A/D

converter

(ICs97)

control

and

LCD

display

control.

It

operates

independently

of

microcomputer

B,

and

microcomputer

B

receives

A/D

converted

data

from

microcomputer

D

only

during

acoustic

compensation.

Multiplexer

control

signals

(@,

©~@®)

are

output

from

microcomputer

D

and

the

frequency

to

be

selected

is

determined.

Next,

a

start

signal

is

sent

from

9

to

start

the

A/D

converter.

When

the

A/D

converter

receives

this

signal,

it

divides

that

frequency

voltage

into

a

6

bit

(64

step)

digital

signal.

When

this

conversion

is

completed,

an

END

signal

is

output

from

the

A/D

converter.

Then

micro-

computer

D

aplies

6

pulses

to

the

CE

pin.

This

pulse

enables

reception

of

the

serial

data

output

from

A/D

converter

@).

During

acoustic

compensation,

microcomputer

B

receives

this

data,

and

stores

the

data

in

the

RAM.

This

data

is

simultaneously

sent

by

microcomputer

C

to

the

LCD

display

circuit

and

lights

up

the

LCD.

For

other

than

acoustic

compensation

A/D

con-

version

as

LCD

display

data

takes

place.

Functions

@

:

ICs,

(multiplexer)

switching

signal.

@

:

LCD

display

use

output

signal.

@,®~@®:

Output

pins

for

frequency

selec-

tion

signal

output.

@

:

Strobe

signal

for

LCD

display.

@®

:

Clock

signal

output

pin.

Pins

@,

@):

LCD

display

data

output

pin.

@3:

Reset

signal

input

pin.

@:

A/D

converter

END

signal

input

pin.

@:

Data

input

from

A/D

converter.

:

Chip

enable

output

to

A/D

converter.

:

Start

signal

output

to

A/D

converter.

ICso,

(MICROCOMPUTER

B)

This

microcomputer

controls

the

entire

system

and

interacts

with

microcomputers

A,

C

and

D

to

control

them.

Functions

Pins

@~@)

control

the

8

ASP

IC’s.

The

upper

3

bits

of

each

ASP

IC

correspond

to

the

chip

select

(CS),

and

each

is

set

as

follows.

000

001

010

orl

100

ICios

ICxo9 ICiio

Gri

Irie

CX7976

OX7976

101

110

ICyos

ICasi

IC352

CX7978

CX7977

@:

Output

for

ASP

clock

signal.

@:

ASP

data

signal

output

pin.

@:

ASP

strobe

signal

output

pin.

Pins

@~@

control

which

IC

is

to

be

selected.

ICiog~1i2

form

the

equalizer

volume

circuit,

and

by

controlling

these

IC’s,

each

frequency

is

con-

trolled

UP

or

DOWN.

ICio3

performs

level

UP/DOWN

and

operates

as

a

2dB

step

volume.

1C351,352

are

input

selection

IC’s.

Pins

@)~@)

are

analog

signal

switching

signals,

and

are

as

follows:

©):

PINK

NOISE/LINE

H:

PINK

NOISE

switching

@):

MIC/LINE

H:

MIC

@:

+6dB/+12dB

H:

+6dB

:

MUTING

H:

MUTING

ON

Pins

()

and

©

are

low

except

during

acoustic

com-

pensation.

(Pin

@

can

be

switched

between

H/L.)

@)

inputs

the

interrupt

signal

output

by

micro-

computer

A

before

it

sends

data

to

microcomputer

B.

When

interrupt

is

received,

an

interrupt

permission

signal

is

output

from

@

to

microcomputer

A.

Pins

@)

and

@)

output

REC

OUT

MUTING

circuit

control

signals.

When

high,

REC

MUTING

turns

ON.

MUTING

is

turned

on

so

that

TAPE,

signal

is

not

output

to

REC

OUT,

and

TAPE,

signal

is

not

output

to

REC

OUT,.

@

outputs

an

interrupt

signal

before

data

is

sent

to

microcomputer

C.

@

is

the

output

for

reset

signal

to

micro-

computer

C.

@

is

the

output

for

the

signal

which

turns

power

supply

switch

relay

ON/OFF.

Pins

@)~

@

are

microcomputer

C

data

output

pins,

and

microcomputer

C

outputs

an

end

signal

after

receiving

the

data.

Pins

@0

receives

this

signal.

@0

is

the

microcomputer

A

clock

signal

input

pin.

@)

is

the

microcomputer

A

serial

data

input

pin.

@3

is

the

output

for

serial

data

to

micro-

computer

A.

Pins

64

~

@)

are

input

pins

for

address

(of

each

frequency)

data

from

microcomputer

D.

Pins

63

~

@

are

input

pins

for

the

control

signal

sent

from

microcomputer

D

to

the

A/D

converter.

G8

is

the

A/D

converter

END

signal

input

pin.

is

the

input

for

A/D

converted

data.

@

is

the

chip

enable

signal

input

pin.

@

is

the

A/D

converter

start

signal

input

pin.

Pins

@

~

are

output

pins

for

data

to

the

RAM.

Pins

60

~

6)

are

output

pins

for

the

address

signals

to

the

RAM.

Pins

68

and

69

are

RAM

R/W

signal

output

pins.

IC493

CX-7978

is

a

2dB

step

low

distortion

ratio

electronic

volume,

with

two

circuits

each

of

which

can

obtain

0

~

78dB,

oo

attenuation.

Functions:

IN,

OUT(@,@,@,@)_

Audio

signal

1/O

pins.

CS

(@,®)

Chip

select

pins;

the

chip

is

se-

lected

when

serial

data

bit

9

and

bit

10

match

CS,,

CS,

levels.

“0”

=

Vss

*°1?

=

OPEN

or

Voi

M/S

(@)

Serial

data

input

mode

switching

(11

bit

input

when

OPEN

or

Vo

)-

Vor

(@)

Power

supply

(higher

voltage

than

Vss).

Vss

(®)

Power

supply

(-14V).

CLOCK

(@)

Clock

signal

input;

takes

in

data

at

clock

signal

rise.

DATA

(@

)

Serial

data

input

pin.

Strobe

(

@

)

Strobe

signal

input

pin.

The

data

taken

into

the

IC

is

latched

at

the

rise

of

this

pulse,

and

the

internal

switch

goes

on

according

to

the

data.

Lvref

(

@))

Sets

control

signal

(clock,

data,

strobe)

input

level

range.

Vop

(

@)

Power

supply

(+14V).

SEQ-555ES

Control

Data

Structure

11

3

2

1

10

9

8

7

6 5

4

CS2|

CS:

pe

[|

8dB

step

data

te

step

ata

|

bit

m

bit

aio

|_

bit

position

Sd

position

87

6543

21

no

change

odB

|0000|{

oa

|

00]

16

dB

0010

24

dB

0011

32

dB

0100

The

attenuation

amount

is

the

sum

of

8dB

step

and

2dB

step.

ICs}.

(TC4052BP)

The

ICs;

truth

table

is

given

below.

IN

HIBIT

B

A

ON

CHANNEL

L

eH

1X,

1Y

L

H

L

2X,

2Y

On

this

model,

it

can

only

be

used

under

the

condi-

tions

shown

inside

the

.

The

voltage

output

from

ICs

is

divided

and

applied

respectively

to

OX,

3Y/3X,

OY.

SEQ-555ES

Making

of

divided

voltage

47k

from

IC5o,

Ei

(microcomputer

D)

ICs10

Actual

separation

E/2

is

by

resistor,

but

equivalently

it

is

by

battery.

In

the

above

figure,

a

high

or

low

signal

is

applied

to

ICsi9

©

from

the

microcomputer.

ICsi9

does

switching

operation,

and

output

voltage

is

as

follows.

When

E/2

is

0

e

E(5.6V)

5V

Ea

E/2(2.8V)

0

ov

E(5.6V)

—_—

E

4.2V

———-

2/3e

Eb

E/2(2.8V)

0

IV

———-2/3e

OV

E(5.6V)

3.4V

——_|/3e

Ec

E/2(2.8V)

:

2

—1/3e

OV

Ea,

Eb

and

Ec

voltages

are

determined

as

shown

above.

However,

1/3e,

2/3e,

—1/3e

and

—2/3e

are

1/3

and

2/3

of

E

and

E/2

voltage

difference,

respec-

tively,

or

are

—1/3

and

—2/3

of

E/2

and

—E

voltage

difference.

Ea,

Eb

and

Ec

output

voltages

are

switched

by

ICs),

switch.

ICyo,

(from

microcomputer

D)

switch

signal

Es

4

switching

signal

2/3E

or

—2/3E

voltage

is

constantly

output.

OX

3X

OX 3x

OY

3Y

OY

3Y

ON

ON ON

ON

e

Ye

A

output

voltage

~Ye

—e

B

output

voltage

we

—Nwe

Voltage

as

shown

above

is

output

in

the

A,

B

outputs,

A,

B

and

C

voltage

and

1/2E

voltage

are

applied

to

the

LCD

unit

and

IC’s.

The

LCD

display

circuit

is

as

follows.

O

A

voltage

O

B

voltage

When

the

potential

difference

at

the

two

LCD

pins

is

more

than

1.5V,

it

lights

up.

The

following

is

for

A

voltage

only.

E

E/2(0)

ok

Interval

when

C

1/2E

interval

voltage

is

applied

As

can

be

seen

from

the

diagram,

the

LCD

does

not

light

up

while

the

C

voltage

is

being

applied.

When

1/2E

voltage

is

applied,

it

lights

up,

but

only

when

E

and

—E

voltage

are

applied,

and

goes

off

SEQ-555ES

A

signal

which

indicates

that

data

may

be

sent

is

output

from

microcomputer

B

to

pin@®.

Data

is

transmitted

after

this

signal

is

received.

Pins

@,

@

~

@

output

key

scan

signals.

1C4s,

(MICROCOMPUTER

C)

This

microcomputer

controls

LED

display.

It

receives

data

to

be

displayed

from

microcomputer

B,

and

controls

which

LED

is

to

be

lit

up

according

to

that

data.

Pins

@

~@

receive

key

inputs.

@

is

for

remote

control

input,

and

is

low

1C75,

(MICROCOMPUTER

A)

because

Qs27

is

ON.

This

judges

which

key

has

been

pressed

for

key

input

When

the

remote

control

signal

is

received

at

IC4o1,

After

data

is

completely

received,

microcomputer

C

or

remote

control

input,

and

transmits

the

data

to

Q152

goes

off

momentarily,

so

@)

goes

high

and

informs

microcomputer

B

of

this

by

a

signal.

ICs9;

microcomputer

B).

stops

the

key

scan

signal.

Then

the

remote

control

Pins

O~@:

@

is

a

data

output

pin,

and

data

is

sent

serially.

signal

passes

Q752

buffer

and

is

received.

when

1/3E

voltage

is

applied.

Before

data

is

sent

out,

microcomputer

B

sends

an

interrupt

signal

to

microcomputer

C.

data

is

transmitted.

Input

pins

for

data

from

micro-

computer

B.

@

is

for

the

transmission

clock

signal,

and

ICso1

©

Interupt

signal

input

pin.

(microcomputer

B)

reads

in

data

at

the

rise

of

this

©

:

Reset

signal

input

pin.

clock

signal.

@

:

Outputs

signal

which

informs

that

When

data

is

transmitted,

a

sign

that

data

is

to

be

sent

iatas

has

hesnceeeived:

to

ICs9;

(microcomputer

B)

is

required,

and

this

is

@

Clock

signal

input

pin.

output

by

@.

.

[(A)

MICRO

COMPUTER

BOARD]

1c751

iit

A

MICRO

COMPUTER

os

Others

pins

(except

power

supply

and

ground)

are

data

output

pins.

TO

ANALOG

0an0

(3)

[(C)

MICRO

COMPUTER

BOARD]

—

(POWER

SW

BOARD(I/3))

[EQ

UP/DOWN

BOARD(I/2)]

1C452,453,459,460_MS4560P

1C451

CX-565

Deas

aL

case

casavane

ase

1C455,457,

M54566P

7

Jc

MICRO

COMPUTER

6.3

T

On

“rasan

LED

ORIVE

;

Lr

£

_

|

0751—755

1ss202

|

Necoanen

+

+——

7

2h

teil

etae|fas

par

ee

ae

ee

Se

mw

oguy

ate

eee

ANE

@

nis

3

oS

ok

om

VOD

(125Ha

‘oon

(ean)

(BkHz)

T

pe

nes

:

“

|

BH,

te,

tee

|]

ee

PO-1

@—X2

{

pos

{48

1

&

8

+

oS

eI

D70I—706

AA34225

|

013

%

ose

oe

oo

By

esd

PO-2

EF

T

Pe-

s4 86

se

S10

Rons

‘

oy

oe

|

te

|

te

3

+s

or

t

r3

+0?

a

PH-0

G2)

5

:

i

ok

06

08

10

:

CHARACTER

‘iit

|

em

annette

t

pe!

'

&

Oe.

Hh

pe

|

of

fe

|

ob

E

ob

ft

s

a

8

(rower

iM)

o7ss

g

'

[za]

—

gee

ic

wees

ae

Be

BO

y

|

1)

Pc-0

DI—

20

1SS53

075!

0752

0754

ast

ca

D708

‘$707

id

°

-

D753,

PE-3

(18)

oy)

+

=

|

7

c

@

-

'

ze

‘gro

}

[POWER]

#

?

=:

oy”

.

R767

78s

‘i

R759

"

net

—_

~]

t

0704

e751

a

:

zy

pr34z2s

|

4,

-4-

fea)

—y--—____—_—

4

bea

.

(zq

0703

‘

I

4

RECEIVED

4

am

ian

ie

erngate

7)

;

@—

L

0707

1s$202

5

TJ

¥

FUNCTION

eat

_—_—

(BONGrioN.,

BG

ee,

ee

ee,

a.

a

BL

pececron

|

feo

{FUNCTION

BOARD(I/3)}

ove

fe

7 7

AGE)

|

oS

GOT]

A

R]]

SH

[Tare?]

|

4Ga)

023—D45

AA3422S

s

e

DOWN]

Hu

a8

§

'

i

POO

s27

Ho)

se6

$25

Ae

As

0751753

DTAIMES

i:

To

cae

4

a

_

4+—

(LEVEL)

[EQUALIZATION]

|

C3)

i

+

5}

eS

Sees

eee

£0

[8]

|

oe

[etl]

GF]

es

[ED

|e

=

we

aa

UP/DOWN

pot

ss

sea

FO

©]

s30

$28

e770

©

t

cal

=e

GI)

Pa-s

7>

S044

oT

11/2),

Fine

FAKED,

Ea

ar]

BS

EQUALIZATION

$703

s702

fi

=

<r

is

oe

p]

ee

Pr-2@

9

8

>

8

oe]

;

=2}-+{leven]

Fx}

$35

$33

$34

$32

.

INPUT

@—

y

SELECTOR

T

he

:

=

men

ga

ws

ar

|

®t

-4

+--+

-

4-4

--]

1@

we

1

:

7

xP

Pb

MEWORY

4

[any

weworr3]

|

[wewory

©

cH,

aa

Sa

ate

jot

ae

ss

Si

oS

a"

Leche

8)

=

z

Ses

7

EQ)

oo

to

=

3

—

|

3)

PA-3.

031

ne

zy

|

l

{REC

OUT

SELECTOR]

Pr

@

Ea

malar)

10>

[une]

wk

(craracrem

f

MODE]

1

(BF

a

TINE

soar

—

oh

4

$701

$704

gu

sms,

AW)

aS aS

Gon

sie

LINE

eo

is

+R)

®

$07

58-07%)

So

fo°B)

$2

0°

4

|

i

Xb

% +

¢

MEMORY

4)

PB-0

Ext=nt

G

Ey

Tea

=

u

J

al

.

|

eo

INPUT

SELECTOR]

EXTAL(T

12

Xb

a

f

b

SET

(rarez=i)

|

[rare

=

2]

=

wise

anes

arse

[e=3}

1

|

+E

7

BUX

2]

WH

037

MEMORY

lbe-aes

LF

oe

Le

se

Loe

$24

.

{ea

|

1

38

¥

8)

PB-4

Ga

:

|

€a

TNE

(POWER

SW

BOARD(I/3)]

(FUNCTION

BOARD(I/3))

RESET

©

En}

|

43)

Hi

=

_———

=

to

|

jo

pene

T

"

WEWORY

7)

PA-3

Go

|

42

é

SET

Ga!

eter

is

I

1C401

pPCI373H

-

-1(9

Ga

T

8)

L

TREMOTE

CONTROL

BOARD)

C0)

(pPETIF

A769

60

-

joa

|

ea

|

cs

R401

mT

caoy

Te

caoz

egos

T+

caos

ape

es

i

|

49)

+

—

'

403

O01

7

ie

tv

ce

i

T

fem)

i

k

™

G

[2]

TAPE

1=2

'

TAPE

21

9752

OTC44ES

{

=

‘SWITCHING

_—

0401

PH3028

et

eu

JREMOTE

SENSER

Sn

SEQ-555ES

|

SECTION

3

DISASSEMBLY

Note:

Follow

the

disassembly

procedure

in

the

numerical

order

given.

SYSTEM

CONTROL

BOARD

@

PTPWH3

x

8

@

8V7T3x6

\

Lit

System

control

board

REMOVE

CASE.

@

BVTT3x6

ANALOG

BOARD

JACK

BOARD

Remove

Bottom

Case

Screw

six

pieces

0

Unsolder.

sacscoal

A

MICRO

COMPUTER

BOARD,

C

MICRO

COMPUTER

BOARD,

PANEL

MOLD

2]

Sub

panel

@

BVTT3

x6

™

=

LAS:

_ay-—O

BVTT3

x6

SEQ-555ES

EQ

UP/DOWN

BOARD,

LED

CHIP

UNIT

@

C

micro

computer

board

@

BVTT3x6

@Remote

con

vival

QA

micro

computer

board

©

8VTT3

x6

@@

~

OLED

CHIP

UNIT

=

@

~-

@

EQ

UP/DOWN

BOARD

@

P3x8

FUNCTION

BOARD,

LCD

BOARD

LCD

board

Function

board

B

Q

Insulator

washer

we

EQ

up/down

oS

board

Poe

eres

a

Yn

a

toy

B

Q

Insulator

washer

SS,

P|

Neo

SECTION

4

ADJUSTMENTS

Frequency

Response

Adjustment:

Be

sure

to

perform

the

following

adjustment

when

replacing

the

microphone.

(This

adjustment

is

performed

to

flatten

the

frequen-

cy

response

by

correcting

the

125Hz

and

16kHz

level

difference

relative

to

4kHz.)

Connection

Diagram:

low

frequency

oscillator

more

than

1001

/6.3V

MIC

jack

MIC

amp

output

test

Procedure:

The

set

may

be

in

any

state.

1)

Apply

a

4Hz

signal

to

the

MIC

jack

from

the

oscillator,

and

adjust

input

level

so

that

output

is

—10dBs.

2)

Set

frequency

to

16kHz,

and

adjust

RV201

to

correct

MIC

data

value

only.

3)

Set

frequency

to

4kHz

and

adjust

input

so

that

output

is

—10dBs.

4)

Set

frequency

to

125Hz,

and

adjust

RV202

to

correct

MIC

data

value

only.

MIC

data

is

as

follows.

oe

ee

eee

’

'

+10dB

OdB

+5dB

The

level

difference

relative

to

4kHz

for

each

frequency

is

to

be

corrected.

In

this

example,

125Hz

is

corrected

+10dB

relative

to

4kHz.

16kHz

is

corrected

+5dB

relative

to

4kHz.

(When

the

adjustment

is

not

exact

with

the

adjustment

resistors,

get

it

as

close

as

possible.)

frequency

response

adjustment

test

SEQ-555ES

RV201

RV202

SEQ-555ES

CTION

4

JSTMENTS

snt

when

frequen-

d

16kHz

frequency

response

adjustment

VTVM

RV201

RV202

test

)

output

from

the

output

is

V201

to

t

so

that

V202

to

for

each

|

+10dB

0

4kHz.

with

the

ossible.)

SEQ-555ES

|

SEQ-555ES

SECTION

5

DIAGRAM

5-1.

MOUNTING

DIAGRAM~

©@

Refer

to

page

38

for

semiconductor

lead

layouts.

1

2

3

4

5

6

7

8

9

Q

;

iC

|

ic2

Ic

.

oe

a

ee

ts

1

;

1

'

’

39 38

4l

42

43

32.44

Note:

B

e

Color

code

of

sleeving

over

the

end

of

the

jacket.

Cc

@

oO—-:

parts

extracted

from

the

component

side.

e

68

part

mounted

on

the

conductor

side.

e

B

+

pattern

@

=x==—p—

::

signal

path

D

eo

ame

=

L-CH

signal

path

©

esecemeep>

=

R-CH

signal

path

E

F

G

H

I

38

37

J

A

a a

a

ee

SN

SUBS

COAG

A

BEN

OR

Pe

LED

CHIP

UNIT

{EQ

UP/DOWN

BOARD)

Down]

Sut

—s

Fe

S46

TAPE

2

45

10

SEQ-555ES

11

12

13

14

15

16

IC

460

;

1C459

1C458

706

755

704

705

ae

703

707

TO

MIC

JACK

BOARD

{(A)MICRO

COMPUTER

BOARD

(W]

——————~30,

31,

37,

38>

22,

23,24,

32—34)>-_______—____—_—_—

(CHASSIS)

[POWER

SW

BOARD)

$7

v7

((C)MICRO

COMPUTER

BOARD

37

14

|

SVp-p

olapsece—s}

SS

a

oe

—{20,

21,30

,

31)—

Sony SEQ-555ES User manual

Popular Stereo Equalizer manuals by other brands