Sansui Au-999 Troubleshooting guide

OPERATING

INSTRUCTIONS

&

SERVICE

MANUAL

SOLID-STATE

STEREO

AMPLIFIER

a

SANSUI

AU-999

Sansui.

SANSUI

ELECTRIC

CO.,

LTD.

Congratulations

on

joining

the

thousands

of

proud,

satisfied

owners

of

quality

stereo

components

from

Sansui.

The

AU-999

is

the

most

advanced

professional

control

amplifier

ever

manufactured

by

Sansui.

Designed

specifically

for

an

ardent

audiophile

like

you,

it

features

the

refined

dull

black

panels

common

to

all

AU

series

professional

control

amplifiers

from

Sansui.

The

preamplifier

section

is

constructed

of

carefully

selected

low-noise

PNP

silicon

tran-

sistors,

while

the

power

amplifier

section

features

direct-coupled

circuits

specially

de-

veloped

with

the

improvement

of

tone

quality

in

mind.

Together,

they

permit

the

AU-999

to

deliver

a

full

180

watts

(4Q)in

music

power

output

with

unprecedentedly

good

tone

quality.

The

AU-999

is

lavishly

endowed

with

accessory

circuits.

These

include

a

Tone

Selector

circuit,

an

improved

form

of

the

Triple

Tone

Control

circuit

that

offers

a

choice

in

selec-

ting

the

critical

frequencies

of

tone

control;

a

Speaker

Selector

which

permits

connecting

three

sets

of

speaker

systems;

a

Balance

Check

Switch

which

simplifies

the

job

of

adjusting

for

optimum

balance

of

the

right

and

left

channel

sound

volumes;

facilities

to

connect

two

phonographs

and

two

tape

decks;

and

a

tape

reprint

circuit

which

makes

it

possible

to

copy

a

recorded

tape

by

utilizing

two

tape

decks.

Special

provisions

have

also

been

made

to

permit

the

amplifier

to

be

built

up

into

an

electronic

crossover

stereo

system

and

permit

comparing

such

a

system

with

a

standard

stereo

setup.

From

the

superior

performance

characteristics

to

the

careful

finish

of

control

knobs,

Sansui’s

tradition

of

quality

is

evident.

Packed

with

the

most

advanced

circuits

throughout,

the

AU-999

comes

to

you

with

the

full

confidence

and

guarantee

of

the

manufacturer.

It

is

now

up

to

you

to

read

the

contents

of

this

manual

carefully

before

setting

out

to

use

it,

so

you

may

operate

it

correctly

and

obtain

the

maximum

performance

it

is

capable

of

offering

for

many

years

to

come.

CONTENTS

SWITCHES

AND

CONTROLS

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3,

4,

5,

6

OPERATIONS

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7,8

——SPEAKER

CONNECTION

—

RECORD

PLAYING

OPERATIONS

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——RADIO

RECEPTIONS

:

-~—MICROPHONES

OPERATIONS

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NAT

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daca:

11,

12

—TAPE

PLAYBACK

——TAPE

RECORDING

ELECTRONIC

CROSSOVER

SYSTEM.

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13,

14

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27,

28

-—TEST

POINTS

—MAIN

AMP.

SECTION

OUTPUT

BALANCE/CURRENT

ADJUSTMENT

PRINTED

CIRCUIT

BOARDS

AND

PARTS

LIST......

29,

30,

31, 32,

33,

34

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OTHER

PARTS

AND

THEIR

POSITION

ON

CHASSIS..............

37,

38

SWITCHES

AND

CONTROLS

Source

Selector

Indicator

Power

Indicator

The

Power

indicator

is

lit

when

the

Power

switch

is

turned

on.

It

remains

lit

while

the

amplifier

is

on.

Speakers

Switch

Three

pairs

of

speakers

can

be

connected

to

the

amplifier.

You

can

install

the

main

set

of

speak-

ers

(System

A)

in

your

listening

room

and

addi-

tional

speakers

(System

B

and

C)

in

the

same

room

or

remotely

in

other

rooms

of

your

home.

With

the

P-M

connector

removed,

the

amplifier

and

the

speakers

connected

to

the

System

C

out-

puts

can

be

used

asa

component

of

the

Electronic

Crossover

System.

OFF:

All

speakers

connected

to

the

amplifier

are

muted

for

private

listening

with

headphones

connected

to

the

Phones

jack.

SYSTEM

A:

Selects

the

speakers

connected

to

the

System

A

terminals.

SYSTEM

B:

Selects

the

speakers

connected

to

the

System

B

terminals.

SYSTEM

A+B:

Selects

the

A

and

B

speakers

simultaneously.

SYSTEM

C:

Selects

the

speakers

connected

to

the

System

C

terminals.

Power

Switch

Power

is

applied

to

the

amplifier

when

the

Power

switch

is

set

in

its

up

position.

This

switch

con-

trols

any

other

components

connected

to

the

upper

two

AC

outlets

on

the

rear

panel.

RE

PETTSMRE

TE

MSEC

TOE

RR

Sanstat.

Headphones

Jack

Plug

a

stereo

headset

into

this

jack

for

private

listening

or

monitoring.

This

jack

will

accept

any

standard

stereo

phone

plug,

but

a

dynamic

head-

set

is

recommended.

Balance

Check

Switch

——————-__—_

This

switch

is

used

to

check

whether

the

sound

levels

from

both

right

and

left

speakers

are

equal.

Turn

the

Mode

switch

to

any

MONO

position;

turn

all

Tone

Selector

switches

to

DEFEAT;

set

the

Balance

Check

switch

to

the

Jown

or

TEST

position;

and

adjust

the

Balance

mmtrol

so

that

the

sound

levels

from

both

speaters

are

:

minimized.

When

not

in

use,

make

wre

this

switch

is

in

its

up

position.

Note:

Headphones

cannot

be

controlled

by

this

switch.

Balance

unequal

sound

levels

fmxrn

both

speakers

as

described

above,

and

then

use

the

headphones.

Volume

Control

This

control

adjusts

the

over-all

sound

level

of

both

channels.

Turn

it

clockwise,

and

the

volume

is

increased;

and

vice

versa.

Source

Selector

Switch

This

switch

selects

from

among

the

various

pro-

yram

sources

connected

to

the

input

jacks

on

the

rear

panel

of

the

amplifier.

MIc:

Selects

a

50kQ

microphone

or

micro-

phones

connected

to

the

MIC

inputs.

PHONO

1:

Selects

a

record

player

having

a

50

kQ

cartridge

connected

to

the

PHONO

1

inputs.

PHONO

2:

Selects

a

record

player

having

a

30,

50

or

100

kQ

cartridge

connected

to

the

PHONO

2

inputs.

AUX:

Selects

other

components

connected

to

the

AUX

inputs.

TUNER:

To

select

a

tuner

connected

to

the

TUNER

inputs,

set

the

lever

to

its

down

or

TUNER

position.

When

not

in

use,

it

must

be

in

its

up

position.

Mode

Switch

STEREO

REVERSE:

Use

this

position

if

the

channels

of

a

stereo

program

are

reversed.

The

Mode

switch

connects

the

left

input

to

the

right

speaker

and

the

right

input

to

the

left

speaker.

STEREO

NORMAL:

Use

this

position

if

the

stereo

program

is

normal.

The

Mode

switch

con-

nects

the

left

input

to

the

left

speaker

end

the

right

input

to

the

right

speaker.

MONO

L+R:

The

Mode

switch

in

this

position

connects

the

left

and

right

inputs

to

bothspeak-

ers.

MONO

L:

The

Mode

switch

in

this

position

connects

the

left

input

to

both

speakers.

MONO

R:

The

Mode

switch

in

this

position

connects

the

right

input

to

speakers.

Balance

Control

This

control

adjusts

for

equal

sound

fron

both

left

and

right

channels

to

compensate

fo;

slight

imperfections

in

program

material,

variaions

in

speaker

output,

and

the

vagaries

of

room

a@cous-

tics.

Treble

Control

This

control

determines

the

amount

of

treble

tone

in

both

channels.

When

the

marker

is

centered

at

the

0

position,

the

response

curve

is

flat.

The

control

emphasizes

the

treble

tone

by

2

dB

per

step

as

it

is

turned

clockwise.

To

decrease

the

treble

loudness,

turn

it

counterclockwise.

Midrange

Control

This

contro]

determines

the

amount

of

midrange

in

both

channels.

When

the

marker

is

centered

at

the

0

position,

the

response

curve

is

flat.

The

contro]

emphasizes

the

midrange

by

1

dB

per

step

as

it

is

turned

clockwise.

To

decrease

the

midrange

loudness,

turn

it

counterclockwise.

Bass

Control

This

control

determines

the

amount

of

bass

tones

in

both

channels.

When

the

marker

is

centered

at

the

0

position,

the

response

curve

is

flat.

The

control

emphasizes

the

bass

tone

by

2

dB

per

step

as

it

is

turned

clockwise.

To

decrease

the

bass

loudness,

turn

it

counterclockwise.

Bass

Tone

Selector

This

switch

selects

the

frequency

at

which

the

Bass

control

begins

to

cut

or

boost.

DEFEAT:

Use

this

position

for

flat

response

at

low

frequencies.

200Hz:

The

Bas

cosntrol

begins

to

cut

or

boost

the

bass

tone

at

200

Hz.

400

Hz:

The

Bass

control

begins

to

cut

or

boost

the

bass

tone

at

400

Hz.

Midrange

Tone

Selector

This

switch

selects

the

frequency

at

which

the

Midrange

control

begins

to

cut

or

boost.

DEFEAT:

Use

this

position

for

flat

response

at

mid-frequencies.

1kHz:

The

Midrange

control

begins

to

cut

or

boost

the

midrange

at

1000

Hz.

2kHz:

The

Midrange

control

begins

to

cut

or

boost

the

midrange

at

2000

Hz.

Treble

Tone

Selector

This

switch

selects

the

frequency

at

which

the

Treble

control

begins

to

cut

or

boost.

DEFEAT:

Use

this

position

for

flat

response

at

high

frequencies.

6kHz:

The

Treble

control

begins

to

cut

or

boost

the

highs

at

6000

Hz.

3kHz:

The

Treble

control

begins

to

cut

ox

boost

the

highs

at

3000

Hz.

Low

Filter

Turntable

rumble

and

other

low-frequency

noises

are

reduced

by

setting

the

Low

Filter

sv

itch

to

the

ON

position.

High

Filter

Surface

noise

from

old

or

worn

records,

tipe

hiss

and

other

high-frequency

noises

are

reduced

by

setting

the

High

Filter

switch

to

the

ON

position.

Tape

Monitor

Switch

Two

stereo

tape

decks

can

be

connected

to

the

amplifier.

When

using

3-head

tape

decks,

this

switch

allows

recording

directly

from

any

program

set

up

on

the

amplifier,

and

at

the

same

time

al-

lows

listening

to

the

actual

recording

as

picked

up

by

the

playback

head.

DECK

1:

Selects

the

tape

deck

connected

to

the

TAPE

1

or

TAPE

RECORDER

jacks.

DECK

2:

Selects

the

tape

deck

connected

to

the

TAPE

2

jacks.

When

not

in

use,

make

sure

the

switch

is

in

the

SOURCE

position.

Muting

Switch

The

Muting

switch

attenuates

music

and

voice

by

20dB

over

the

whole

frequency

range

without

use

of

the

Volume

control.

This

switch

is

used

to

suppress

the

background

noise

heard

when

changing

a

record,

and

to

reduce

the

over-all

sound

level

temporarily

while

playing

a

record.

Tape-to-Tape

Reprint

When

connecting

two

tape

decks

to

the

amplifier,

this

switch

allows

tape-to-tape

recording.

DECK

1-2:

Use

this

position

for

recording

from

tape

deck

1

to

tape

deck

2.

SOURCE

RECORD:

With

the

switch

in

this

position,

any

program

source

selected

by

the

Source

Selector

switch

can

be

recorded

by

either

deck

1

or

2,

or

by

both

decks

simultaneously.

DECK

2-+1:

Use

this

position

for

recording

from

tape

deck

2

to

tape

deck

1.

Note:

During

the

tape-to-tape

reprinting

process,

monitoring

is

possible

on

either

recording

or

play-

back

side

by

setting

the

Tape

Monitor

switch

to

the

DECK

1

or

DECK

2

position.

When

the

Tape

Monitor

switch

is

returned

to

the

SOURCE

position,

it

is

possible

to

play

a

record

as

usual

while

reprinting.

SPEAKER

CONNECTIONS

___

RECORD

PLAYING

Connecting

Loudspeakers

Three

pairs

of

4-

to

16-ohm

speakers

can

be

con-

nected

to

the

amplifier.

One

set

of

speakers

con-

nected

to

the

SYSTEM

A

terminals

may

be

installed

in

your

listening

room

and

two

other

sets

of

speakers

connected

to

the

SYSTEM

B

and

C

outputs

may

be

installed

in

other

rooms

of

your

home.

The

Speakers

switch

selects

from

among

the

A,

B

and

C

speakers.

When

it

is

set

to

the

SYSTEM

A+B

position,

you

will

hear

sound

from

both

speaker

systems.

Only

the

C

speakers

can

be

used

as

a

component

of

the

Electronic

Crossover

System.

A

detailed

description

will

be

found

in

the

section

en-

titled

Electronic

Crossover

System.

To

connect

the

main

set

of

speakers

to

the

ampli-

fier:

1.

Connect

the

positive

terminal

of

the

speaker

on

your

right

(as

viewed

from

the

listening

area)

to

the

right

channel

SYSTEM

A

(+)

terminal

on

the

rear

of

the

amplifier.

2.

Connect

the

lead

from

the

negative

speaker

terminal

(marked

—)

to

the

right

channel

SYS-

TEM

A

(—)

terminal

on

the

rear

of

the

amplifier.

3.

The

left

speaker

connections

are

made

at

the

left

channel

SYSTEM

A

terminals

on

the

rear

of

the

amplifier

in

the

manner

described

above.

4,

Set

the

SPEAKERS

selector

to

SYSTEM

A.

In

connecting

speakers

to

the

amplifier,

no

more

than

44-inch

of

insulation

should

be

removed

from

the

end

of

a

speaker

cable,

since

any

greater

length

of

exposed

wire

is

likely

to

cause

shorts

at

the

ter-

minals.

Al!

wire

strands

should

be

tightly

twisted.

To

connect,

depress

the

terminal

button

with

one

hand,

push

the

stripped

end

of

lead

wire

in

the

hole

with

the

other

hand,

and

release

the

button.

1f

you

wish

to

connect

one

or

two

more

sets

of

speakers

in

the

same

room

or

remotely,

you

can

connect

such

speakers

to

the

SYSTEM

B

and

C

terminals

of

each

channel

as

indicated

above.

To

listen

to

sound

from

the

B

or

C

speakers,

be

sure

to

turn

the

Speakers

switch

to

the

SYSTEM

B

or

C

position

respectively.

RECORD

PLAYERS

Connecting

Record

Players

The

AU-999

has

two

sets

of

PHONO

inputs

to

accommodate

a

pair

of

players.

The

PHONO

1

has

the

input

impedance

of

50

kQ.

The

PHONO

2

can

be

switched

between

30,

50

and

100k

by

means

of

the

PICKUP

LOAD

switch

on

the

rear

panel.

To

connect

a

record

player

to

the

amplifier,

proceed

as

follows:

1.

Connect

the

left

channel

output

of

the

record

player

to

the

LEFT

PHONO

1

(or

PHONO

2)

input

jack

on

the

rear

of

the

amplifier.

2.

Connect

the

right

channel

output

of

the

record

player

to

the

RIGHT

PHONO

1

(or

PHONO

2)

input

jack.

3.

If

a

monophonic

player

or

turntable

is

used,

it

may

be

connected

to

either

LEFT

or

RIGHT

PHONO

input

jack.

Listening

to

a

Stereo

or

Mono

Record

1.

Set

the

SOURCE

SELECTOR

switch

to

PHO-

NO

1

or

PHONO

2

depending

on

which

input

is

being

used.

Check

the

TUNER

SELECTOR

switch

to

see

if

it

is

in

its

up

position.

2.

Set

the

MODE

switch

to

STEREO.

Ifa

mono-

phonic

record

player

is

used,

set

the

MODE

switch

to

MONO.

3.

Make

appropriate

settings

of

controls

on

the

record

player.

4,

Place

the

needle

on

the

record.

5.

Adjust

the

BALANCE

control

for

equal

sound

from

both

right

and

left

speakers.

6.

Use

all

other

controls

and

switches

accorcling

to

your

personal

taste

and

room

acoustics.

Note:

When

monophonic

records

are

played

on

a

stereo

player,

follow

the

same

procedures

as

for

stereophonic

records

for

better

results.

Insert

the

power-cord

plug

of

the

player

int»

one

of

the

two

A.C.

outlets

marked

SWITCHED

on

the

rear

of

the

amplifier.

The

power

supply

wall

then

be

controlled

by

the

front

POWER

switch.

===

LEFT

CHANNEL

RIGHT

CHANNEL

VOLTAGE

SELECTOR...

wi

PM

CONNECTOR

MAY

VOLTAGE

SELECTOR

PLUG

CONNECTING

TO

SPEAKER

TERMINALS

TO

PICKUP

RECORD

PLAYER

LOAD

SWITCH

RECORD

PLAYER

Dae

sian.

POWER

FUSE

|

GROUNDING

|

LEVEL

ADJUST

GROUNDING

——

SYSTEM

A

ecenetan

es

elazetenon!

HRN

|:

SRNR

RO

RRO

CR

Es

RIGHT

SPEAKER

LEFT

SPEAKER

LEFT

SPEAKER

RIGHT

SPEAKER

LEFT

SPEAKER

RIGHT

SPEAKER

ag)

RADIO

RECEPTION

___

MICROPHONES

TUNERS

Connecting

Tuners

For

a

stereo

tuner,

connect

its

left

channel

output

to

the

left

channel

TUNER

input

jack,

and

its

right

channel

output

to

the

right

channel

TUNER

input

jack.

For

a

monophonic

tuner,

connect

its

output

to

either

left

or

right

jack.

For

use

with

an

FM-

MPX

adaptor,

connect

the

tuner

output

to

the

adaptor

input;

then

connect

the

left

channel

output

of

the

adaptor

to

the

left

channel

TUNER

jack,

and

the

right

channel

output

of

the

adaptor

to

the

right

channel

TUNER

jack.

Listening

to

a

Stereo

FM

Program

1.

Set

the

TUNER

SELECTOR

switch

to

its

down

or

TUNER

position.

2.

Set

the

MODE

switch

to

STEREO.

3.

Use

tuning

controls

to

reach

the

desired

station.

Make

appropriate

settings

of

controls

on

the

tuner.

4,

Adjust

the

amplifier’s

front

panel

controls

and

switches

according

to

your

personal

taste

and

room

acoustics.

Listening

to

a

Mono

Program

1.

Set

the

TUNER

SELECTOR

switch

to

its

down

or

TUNER

position.

2.

Set

the

MODE

switch

to

MONO.

3.

Use

tuning

controls

to

reach

the

desired

station.

Make

appropriate

settings

of

controls

on

the

tuner.

4,

Adjust

the

amplifier’s

front

panel

controls

and

switches

according

to

your

personal

taste

and

room

acoustics.

For

Use

with

an

FM-MPX

Adaptor

1.

Set

the

TUNER

SELECTOR

switch

to

its

down

or

TUNER

position.

2.

Set

the

MODE

switch

to

STEREO.

3.

Use

tuning

controls

to

reach

the

desired

station.

4.

Make

appropriate

settings

of

controls

on

the

FM-MPX

adaptor.

5.

Adjust

the

amplifier’s

front

panel

controls

and

switches

according

to

your

personal

taste

and

room

acoustics.

MICROPHONES

One

or

two

microphones

can

be

connected

to

the

MIC

inputs

on

the

rear

of

the

amplifier.

Use

high-

impedance

50-kQ

dynamic

or

velocity

microphones

for

optimum

performance.

Connections

If

two

microphones

are

used,

connect

one

to

the

RIGHT

MIC

input

and

the

other

to

the

LEFT.

If

only

one

microphone

is

used,

connect

it

to

either

RIGHT

or

LEFT

MIC

input.

‘

Ee

Biaiictiey

\“Shieided®

wire:

Operation

1.

Turn

the

SOURCE

SELECTOR

switch

to

MIC.

Check

the

TUNER

SELECTOR

switch

to

see

if

it

is

in

its

up

position.

2.

If

two

microphones

are

used,

set

the

MODE

switch

to

MONO

L+R

for

mixing

the

two

input

signals

or

to

STEREO

for

separate

use

of

the

two

microphones.

If

only

one

microphone

is

used,

set

the

MODE

switch

to

MONO

L

or

MONO

R

de-

pending

on

which

input

is

being

used.

3.

Use

all

other

controls

and

switches

according

to

taste

and

listening

conditions.

CAUTION:

When

you

connect

one

set

of

speakers

to

the

SYSTEM

A

terminals

and

another

set

of

speakers

to

the

SYSTEM

B

in

order

to

use

them

simultaneously

with

the

Speakers

switch

set

in

its

SYSTEM

A+B

position,

each

speaker

must

have

impedance

of

8ohms

or

more.

If

a

4ohm

im-

pedance

speaker

is

used,

the

amplifier

may

be

damaged.

FM

MPX

ADAPTOR}

TO

TUNER

SEE

‘SPEAKER

CONNECTION”

WALL

0UITLET

oe

LEFT

CHANNEL

RIGHT

CHANNEL

MICROPHONE

(50

k{))

==

4o°

OPERATIONS

——

TAPE

PLAYBACK

——

TAPE

RECORDING

TAPE

DECKS

Connecting

Tape

Decks

Tape

decks

can

be

connected

to

record

from,

and

playback

through,

the

AU-999.

Tape

monitoring

is

possible

with

a

tape

machine

having

a

built-in

pre-amplifier

as

well

as

separate

recording

and

playback

heads.

Tape

Deck

with

DIN

Connector

If

your

tape

deck

has

a

DIN

(German

Industrial

Standard)

5-pin

plug,

plug

it

into

the

TAPE

RE-

CORDER

socket

on

the

rear

panel

of

the

amplifier.

Caution:

The

tape

deck

having

a

DIN

connector

must

not

be

used

together

with

another

tape

deck

connected

to

the

TAPE

1

jacks.

To

use

both

decks

simultaneously,

the

latter

tape

deck

should

be

con-

nected

to

the

TAPE

2

jacks.

Pin-Jack

Tape

Deck

To

record

on

tapes

from

the

amplifier:

1.

Connect

the

left

channel

input

of

the

tape

deck

to

the

left

channel

TAPE

1

(or

2)

REC

jack

on

the

rear

of

the

amplifier.

2.

Connect

the

right

channel

input

of

the

tape

deck

to

the

right

channel

TAPE

1

(or

2)

REC

jack.

3.

If

a

monophonic

tape

recorder

is

used,

it

may

be

connected

to

either

left

or

right

TAPE

REC

jack.

To

playback

through

the

amplifier:

1.

Connect

the

left

channel

output

of

the

tape

deck

to

the

left

channel

TAPE

1

(or

2)

PLAY

jack

on

the

rear

of

the

amplifier.

2.

Connect

the

right

channel

output

of

the

tape

deck

to

the

right

channel

TAPE

1

(or

2)

PLAY

jack,

3.

Ifa

monophonic

tape

recorder

is

used,

it

may

be

connected

to

either

left

or

right

TAPE PLAY

jack.

Recording

on

Tapes

1.

Set

the

SOURCE

SELECTOR

switch

to

the

program

to

be

recorded.

2.

Set

the

MODE

switch

to

STEREO.

Ifa

mono-

phonic

tape

recorder

is

used,

set

the

switch

to

MONO.

3.

Make

appropriate

settings

of

controls

on

the

tape

deck.

To

record

on

a

pair

of

tapes

simultaneously

by

using

two

tape

decks

connected

to

the

TAPE

1

and

2

jacks:

1.

Set

the

SOURCE

SELECTOR

switch

to

the

program

to

be

recorded.

2.

Set

the

TAPE-TO-TAPE

REPRINT

switch

to

SOURCE

RECORD.

3.

Set

the

tape

decks

in

the

recording

mode.

4,

Use

other

controls

and

switches

appropriately.

Listening

to

Tapes

1.

Turn

the

TAPE

MONITOR

switch

to

PLAY

BACK DECK

1

or

2.

Set

the

MODE

switch

to

STEREO.

Ifa

mono-

phonic

tape

recorder

is

used,

set

the

switch

to

MONO.

3.

Make

appropriate

settings

of

controls

on

the

tape

deck.

4.

Use

the

amplifier’s

front

panel

controls

and

switches

according

to

your

personal

taste

and

listen-

ing

conditions.

Tape

Monitoring

is

possible

only

with

a

tape

deck

which

has

its

own

playback

preamplifier

as

well

as

separate

recording

and

playback

heads.

Set

the

TAPE

MONITOR

switch

to

PLAYBACK

and

use

all

other

controls

and

switches

according

to

your

personal

taste

and

listening

conditions.

‘Tape-to-Tape

Reprinting

To

record

from

the

tape

deck

connected

to

the

TAPE

1

jacks

to

the

tape

deck

connected

to

the

TAPE

2

jacks:

1.

Turn

the

TAPE-TO-TAPE

REPRINT

switch

to

DECK

1

->

2.

Set

tape

deck

2

in

the

recording

mode.

3.

Set

tape

deck

1

in

the

playback

mode.

4,

Use

other

controls

and

switches

approprately.

To

record

from

tape

deck

2

to

tape

deck

1:

1.

Turn

the

TAPE-TO-TAPE

REPRINT

switch

to

DECK

2

—

1.

2.

Set

tape

deck

1

in

the

recording

mode.

3.

Set

tape

deck

2

in

the

playback

mode.

4,

Use

other

controls

and

switches

appropriately.

Notes:

l.

Tape

recorded

sound

cannot

be

controlled

by

the

controls

and

switches

on

the

front

panel

of

the

amplifier.

They

control

sound

from

the

speakers

only.

®.

For

better

results,

record

directly

through

the

RECORD-

ING

}

TAPE

DECK

iS

PLAYBACK

erm

ene

ieenemeemeremenennennnnninnnitnimememnnnell

AU-999,

rather

than

through

microphones

placed

in

front

of

the

speakers.

3.

Before

connecting

and

operating

the

tape

decks,

be

sure

to

look

up

the

manufacturer’s

operating

instructions.

4.

The

TAPE

MONITOR

switch

should

be

in

the

SOURCE

position

except

when

the

tapes

are

being

monitored

or

played

back

by

the

tape

deck.

When

the

switch

is

in

the

PLAY

BACK

position,

signals

from

any

other

source

will

not

be

heard

from

the

speakers.

RECORDING

TO

TAPED

ECK

A

(0

ae

_

moa.

|

‘ig

@@

1

@@

,

PLAYBACK

TAPE

DECK

‘SEE

“SPEAKER

CONNECTION”

LEFT

CHANNEL

RIGHT

CHANNEL

—

12

—

Electronic

Crossover

System

The

electronic

crossover

system

is

said

to

be

the

best

hi-fi

sound

reproduction

method

available,

featuring

the

following

advantages:

1.

Since

the

tweeters,

midranges

and

woofers

have

their

own

amplifier,

any

speakers

of

different

im-

pedance

and

efficiency

can

be

used

for

stereo

ar-

rangement.

2.

This

system

has

better

filter

characteristics

than

the

conventional

LC

crossover

network.

You

can

determine

the

optimum

crossover

points

for

the

speakers

used.

3.

Since

there

is

no

component

between

the

ampli-

fier

and

speaker,

the

damping

factor

of

the

amplifier

is

not

affected

and

it

is

directly

coupled

to

the

speaker.

4.

This

system

allows

use

of

the

power

amplifiers

effectively

and

efficiently.

For

instance,

a

big-power

amplifier

can

be

used

for

woofers,

and

ones

with

good

characteristics

for

midranges

and

tweeters.

You

can

select

the

amplifiers

suitable

for

each

of

the

woofers,

midranges

and

tweeters.

The

AU-999’s

preamp

and

main

amplifier

sections

can

be

used

separately

by

simply

removing

a

pair

of

connectors

from

the

PRE

OUTPUT

and

MAIN

INPUT

jacks

on

the

rear

panel.

This

feature

en-

ables

you

to

use

the

AU-999

as

a

component

of

an

Electronic

Crossover

System

in

the

following

man-

ner:

1.

Set

the

SPEAKERS

switch

to

SYSTEM

C.

2.

Remove

the

two

connectors

from

the

PRE

OUT-

PUT

and

MAIN

INPUT

jacks.

3.

Connect

an

electronic

crossover

unit

(Sansui

CD-5)

to

the

PRE

OUTPUT

jacks.

4.

Connect

the

low-frequency

output

of

the

electro-

nic

crossover

unit

to

the

MAIN

INPUT

jacks

on

the

AU-999.

5.

Connect

the

right

and

left

woofers

to

the

SYS-

TEM

C

terminals

on

the

AU-999.

6.

Connect

the

mid-frequency

output

of

the

elec-

tronic

crossover

unit

to

the

inputs

of

the

second

separate

power

amplifier

(Sansui

BA-90),

and

the

right

and

left

midrange

speakers

to

the

said

power

RONIC

CROSSOVER

SYSTEM

amplifier.

7.

Connect

the

high-frequency

output

of

the

elec-

tronic

crossover

unit

to

the

inputs

of

the

third

sepa-

rate

power

amplifier

(Sansui

BA-90),

and

the

right

and

left

tweeters

to

the

said

power

amplifier.

Notes:

1.

You

can

connect

speakers

to

the

SYSTEM

A

and

B

terminals

in

addition

to

the

SYSTEM

C

and

directly

compare

the

sound

of

the

Electronic

Crossover

System

with

that

of

the

ordinary

stereo

arrangement

by

turning

the

SPEAKERS

switch

between

the

SYSTEM

A,

B

and

C

positions.

2.

The

connection

of

an

additional

pre-amplifier

to

the

MAIN

INPUT

jacks

cuts

off

all

front

panel

switches

and

controls

except

the

BALANCE

CHECK

and

SPEAKERS

switches.

Thus,

to

adjust

the

tone

and

volume,

operate

the

controls

of

the

additional

pre-amplifier

connected

to

the

AU-999.

When

an

additional

power

amplifier

is

connected

to

the

PRE

OUTPUT

jacks,

the

tone

and

volume

can

be

adjusted

by

the

controls

of

the

AU-999.

13:

—

BASIC

AMP.

FO

HIGH

RANGE

0

a

ae

BASIC

AMP.

FOR

MIDRANGE

,

ELECTRONIC

|

CROSSOVER

UNIT

RECORD

PLAYER

PRE-AMP.

OUTPUT

BASIC

AMP.

INPUT

FOR

LOW

RANGE

2,

ARR

‘

SSNS

RRR)

RRR

ean

LEFT

CHANNEL

RIGHT

CHANNEL

WOOFER

_

LEFT

SPEAKER

©

TWEETER

RIGHT

SPEAKER

MAINTENANCE

PM

Connectors

Warning:

Be

sure

to

turn

the

POWER

switch

OFF

before

removing

the

PM

connectors.

The

PM

connectors

hook

up

the

PRE

OUTPUT

and

MAIN

INPUT

terminals

on

the

rear

panel

of

the

amplifier.

When

the

PM

connectors

are

remov-

ed

with

the

SPEAKERS

switch

set

in

the

SYS-

TEM

C

position,

the

pre-and

main

amplifier

sections

can

be

used

individually

and

separately.

They

should

not

be

removed

except

when

connecting

additional

pre-

and/or

main

amplifiers.

Refer

to

the

section

en-

titled

Electronic

Crossover

System.

Level

Adjustments

AUX:

This

level

control

determines

the

strength

of

signals

fed

into

the

AUX

inputs.

PHONO

1

and

2:

Two

level

controls

are

provided

to

adjust

the

loudness

of

each

phonograph

input.

Adjust

these

controls

so

that

there

will

not

be

any

difference

in

the

loudness

level

between

the

PHONO

1

and

2

inputs.

To

increase

the

loudness

level,

turn

the

controls

clockwise

with

a

screwdriver;

to

decrease,

turn

them

counterclockwise.

Connecting

Wire

Be

sure

to

use

adequately

thick

shieldwire

when

connecting

tape

decks,

record

players

or

other

components

to

the

AU-999.

The

use

of

an

ordi-

nary

twin

leadwire

may

cause

hum

or

noise.

Don’t

use

shieldwire

longer

than

7

feet

(2

meters).

The

use

of

a

longer

wire

leads

to

greater

attenuation

at

high

frequencies.

CONNECTING

SHIELDED

CABLE:

TO

A

PIN.

PLUG

Connections

Always

check

to

see

that

leads

are

connected

firmly

and

properly

to

their

corresponding

output

or

input

terminals.

If

the

connections

are

loose

or

in

touch

with

other

parts,

the

AU-999

will

not

perform

normally,

and

may

produce

undesirable

noise.

If

used

in

such

a

way

for

a

long

time,

it

will

eventually

break

down.

Always

read

the

manufacturer’s

in-

structions

for

tape

decks,

record

players,

etc.

before

connecting.

Where

to

Place

Since

transistors

are

extremely

susceptible

to

heat,

the

AU-999

has

been

designed

to

diffuse

heat

through

the top

and

rear

of

its

case.

Therefore,

special

consideration

should

be

given

to

where

it

will

be

used

before

installing

the

system.

It

should

not

be

operated

in

a

place

where

it

is

exposed

directly

to

the

sun,

near

radiators

or

other

heat-

generating

sources,

and

it

should

never

be

mounted

in

an

air-tight

cabinet.

Finally,

nothing

shoald

be

placed

on

top

of

it.

—

15

—

Hum

and

Howling

If,

when

using

a

tape

deck

or

record

player,

unpleasant

humming

or

howling

is

heard,

it

1s

usually

a

result

of

the

following.

The

record

player

is

placed

on

or

near

the

speaker

box

causing

sound

waves

to

be

transmitted

from

the

speaker

to

the

player

(howling).

To

prevent

this,

place

the

record

player

away

from

the

speaker

box

or

put

a

thick

cushion

between

the

two

com-

ponents.

A

low

buzzing

sound

will

also

be

produced

if

ade-

quately

thick

shieldwire

is

not

used

for

connections,

or

if

connections

have

not

been

properly

made.

Be

sure

that

the

shieldwire

is

properly

soldered

to

the

pin-plugs

as

illustrated

in

“Connecting

Wire”,

and

that

the

motor

and

pickup

arm

or

the

record

player

are

properly

grounded.

Speaker

Impedance

Combined

impedance

of

speakers

in

each

channel

should

not

be

less

than

4

ohms.

Too

low

impedance

may

blow

quick-acting

fuses

or

may

cause

damage

to

the

amplifier

after

use

over

a

long

period.

Phasing

of

Speakers

Stand

about

10

feet

in

front

of

and

midway

between

the

speakers

and

listen

to

any

monophonic

repro-

duction.

If

the

speakers

are

correctly

phased,

the

sound

will

seem

to

come

from

between

the

speakers.

If

the

sound

is

not

directly

in

front

of

you,

the

speakers

are

incorrectly

phased.

To

correct

this

switch

the

amplifier

off

and

reverse

the

leads

to

one

speaker.

Care

should

be

taken

not

te

connect

a

single

speak-

er

system

between

the

SYSTEM

A

and

B

termi-

nals,

a

minal

Grounding

Connect

one

end

of

vinyl

or

enameled

wire

to

the

terminal

screw

marked

GND

on

the

rear

of

the

amplifier,

attach

a

copper

plate

to

the

other

end

and

bury

it

underground.

Whenever

an

outdoor

AM

antenna

is

used,

grounding

becomes

necessary.

In

all

cases,

grounding

is

desirable

since

it

allows

a

better

SN

ratio

to

be

obtained.

To

ground

an

entire

audio

system,

connect

the

grounding

wire

of

each

component

used

to

this

terminal.

a

~

seeyeem

E

i

COPPER:

PLATE

a

_

[BURIED

UNDERGROUND:

as

{G5

Quick-Acting

Fuses

The

AU-999

is

double

protected

by

the

quick-acting

fuses

at

every

power

transistor

stage

and

in

the

power

circuit.

If

sound

from

the

speakers

is

distorted

or

not

heard

at

all,

immediately

remove

the

power

plug

from

its

outlet;

check

for

the

blown

SPEAK-

ER

FUSES

on

the

rear

panel;

and,

if

necessary,

replace

them

with

the

new

5-ampere

fuses

(sup-

plied).

If

OK,

remove

the

bonnet

from

the

AU-

999;

check

the

inside

fuses;

and,

if

necessary,

replace

them

with

the

new

5-ampere

fuses

(supplied).

Be-

fore

replacing,

check

for

the

source

of

trouble

that

caused

the

fuses

to

blow.

If

the

new

fuses

blow

as

soon

as

the

POWER

switch

is

turned

on,

check

for

the

defective

power

circuit.

If

the

trouble

source

cannot

be

located,

contact

the

nearest

Sansui

deal-

er

or

Service

Center.

A.C.

Outlets

The

AU-999

is

provided

with

five

A.C.

outlets

on

its

rear

panel.

The

upper

two

outlets

marked

ICE

/

ACCESSORIES

SWITCHED

are

switched

on

and

off

by

the

POW-

ER

switch

on

the

front

panel.

Caution:

The

upper

two

outlets

have

a

maxi-

mum

capacity

of

150

VA

total

and

the

three

other

outlets

300

VA

total.

Never

use

them

beyond

their

rated

capacities.

Power

Fuse

CAUTION:

For

the

power

supply

voltage

of

100

to

127

volts,

use

a

4-ampere

fuse;

for

220

to

250

volts,

use

a

3-ampere

fuse.

If

the

unit

remains

completely

dead

when

the

power

is

switched

on

(POWER

indicator

fails

to

light),

the

power

fuse

is

probably

blown.

In

this

case,

remove

the

power

plug

from

its

AC

outlet

and

replace

the

fuse

after

finding

and

eliminating

the

trouble

that

caused

the

fuse

to

blow.

(Consult

the

Troubleshoot-

ing

Section

in

your

Service

Manual)

Use

only

a

glass-tubed

4(or

3)-ampere

fuse

Never

attempt

to

use

a

piece

of

wire

or

a

fuse

of

a

tifferent

capacity

as

a

substitute.

Voltage

Adjustment

To

reach

the

voltage

selector,

remove

he

two

screws

from

the

nameplate

on

the

rear

pmel

and

then

remove

the

nameplate.

The

voltage

selector

makes

it

possible

to

operate

the

AU-999

at

the

correct

voltage

in

any

area.

The

voltage

bs

been

pre-adjusted

at

the

factory,

but

can

be

esaly

re-

adjusted

as

follows:

pas

lp

eee

srpeprnaemtpnen

siemens

sree’

STENT

get

a

ET

NASR

PPE

SCS

RET

SEI

POETS

EE

I

TITTIES

EE

LT

TLE

LEIS

ETE

ITE

INDE

TET

TTT

TIO

EET

STEP

I

Set

arrow

of

main

voltage

selector

plug

to

required

voltage:

100,

110, 117,

127,

220,

230,

240

or

250

volts.

STEP

IL

If

numerals

of

voltage

are

printed

in

red,

set

arrow

of

adjacent

sub

V.S.

plug

to

position

marked

red.

If

there

are

printed

in

white,

set

arrow

to

position

marked

white.

Note:

The

Voltage

Adjustor

can

be

also

used

to

eliminate

trouble

caused

by

considerable

voltage

fluctuation.

In

this

case,

it

should

be

set

to

the

peak

voltage.

Accessories

List

1.

OPERATING

INSTRUCTIONS

AND

SERVICE

MANUAL

......0..

ee

1

2:

OPERATING

SHEET

2.440

othe

Aaa.

a

1

2.

PINSPLUGS

eid

idsteieds

up

cae

sieesoate

es

4

4.

MIC-PLUG

woe

ci

ete

asians

2

5.

QUICK

ACTING

FUSES

(SPEAKER

PUSES)OAL

ct

ccasas

uncyasseveusaransass

See

4

en

POLISHING

CLOTH.

osteo

ae

oe

7.

BUTTERFLY

BOLT

Sissi

escci

as

ae

hth

Bi

WASHERS:

ors

cssree

ciate

ieee

Ae,

Se

PO

MP

Fe

NM

—

18

—

POWER

AMPLIFIER

SECTION:

POWER

OUTPUT:

MUSIC

POWER

(IHF):

180W

at

4

ohms

load

140W

at

8

ohms

load

CONTINUOUS

POWER:

70/70W

at

4

ohms

load

50/50W

at

8

ohms

load

TOTAL

HARMONIC

DISTORTION:

less

than

0.4%

at

rated

output

INTERMODULATION

DISTORTION

(60Hz:

7,000Hz=4:1

SMPTE

method)

less

than

0.4%

at

rated

output

POWER

BANDWIDTH

(IHF)

10

to

30,000Hz

at

8

ohms

load

FREQUENCY

RESPONSE

(at

normal

listning

level):

5

to

100,000Hz

+

1dB

CHANNEL

SEPARATION

(at

1,000Hz,

rated

out-

put):

better

than

50dB

HUM

AND

NOISE

(IHF)

better

than

100dB

INPUT

SENSITIVITY:

1V

for

rated

output

INPUT

IMPEDANCE:

50k

ohms

LOAD

IMPEDANCE:

4

to

16

ohms

DAMPING

FACTOR:

45

at

8

ohms

load

PRE-AMPLIFIER

SECTION

OUTPUT

VOLTAGE:

MAXIMUM

OUTPUT

VOLTAGE:

5V

RATED

OUTPUT

VOLTAGE:

1Vv

TOTAL

HARMONIC

DISTORTION:

less

than

0.1%

at

rated

output

voltage

FREQUENCY

RESPONSE:

20

to

70,000Hz

+

0.5dB—1.5dB

HUM

AND

NOISE

(IHF):

PHONO-1

and

2:

better

than

80dB

MIC:

better

than

80dB

TUNER

and

AUX:

better

than

85dB

INPUT

SENSITIVITY

(at

1,000Hz,

rated

output

voltage)

PHONO-1

2mV

(50k

ohms)

PHONO-2

2mV

(30k,

50k,

100k

ohms)

MIC:

3mV

(50k

ohms)

TUNER:

200mV

(50k

ohms)

AUX:

200mV

(50k

ohms)

TAPE

MON

(pin):

200mV

(50k

ohms)

TAPE

RECORDER

(DIN):

200mV

(50k

ohms)

RECORDING

OUTPUT:

TAPE

REC

(pin):

200mVv

TAPE

RECORDER

(DIN):

30mv

EQUALIZER:

PHONO,

MIC:

NF

type

—

19

CONTROLS:

BASS:

+12dB—8dB8

at

20Hz

MIDRANGE:

+

5dB—5dB

at

1,000Hz

or

2,000Hz

TREBLE:

+12dB—8dB

at

20,000Hz

TONE

SELECTOR:

BASS:

DEFEAT,

200Hz,

400Hz

MIDRANGE:

DEFEAT,

1,000Hz,

2,000Hz

TREBLE:

DEFEAT,

6,000Hz,

3,000Hz

SWITCHES:

LOW

FILTER:

—20dB

at

20Hz

(12dB/oct,

NF

type)

HIGH

FILTER:

—18dB

at

20,000Hz

(12dB/oct,

NF

type)

MUTING:

—20dB

MODE:

STEREO-REV,

STEREO-NORM,

MONO-L+R,

MONO-L,

MONO-R

SOURCE

SELECTOR:

MIC,

PHONO-1,

PHONO-2,

AUX

TUNER

SELECTOR:

OFF,

ON

TAPE

MONITOR:

PLAYBACK

DECK-1,

SOURCE,

PLAYBACK

DECK-2

TAPE

TO

TAPE

REPRINT:

DECK-1

to

2

SOURCE

RECORD,

DECK-2

to

1

SPEAKER

SELECTOR:

OFF,

SYSTEM-A,

SYSTEM-B,

SYSTEM-A+B,

SYSTEM-C

(PRE-

and

MAIN

SEPARATED)

BALANCE

CHECK:

NORMAL,

TEST

THE

OTHER

ACCESSORIES:

5-pin

DIN

socket

for

Tape

Recorder,

Head

Phone

Jack,

Input

Level

Adjuster

for

PHONO-1,

PHONO-2

and

AUX,

One-toutch

clip

type

Speaker

Terminals

Source

Selector

Indicator

TRANSISTORS

AND

DIODES:

Transistors;

41

Diodes;

16

Triac;

2

POWER

REQUIREMENTS:

POWER

VOLTAGE:

100,

110,

117,

127,

220,

230,

240,

250V

50/60Hz

POWER

CONSUMPTION:

370W

(max.

signal)

DIMENSIONS:

18144"W

x

614"Hx124%"D

WEIGHT:

38.5

Ibs.

CHARACTERISTICS

MUSIC

POWER

(%)

DISTORTIO

LOW/HIGH

FILTER

DISTORTION

(%}

PUT

—AUX

OUTPUT-8Q

LOAD

FREQUENCY-60Hz+7KH

%)

oO

=

oO oO

ro

|

IM

DISTORTION

a

0

2)

}

||

-4|

44

hese

mae

=—-6

1

$8

tw-10)

a

+

tt

B-12

{it

nt

S-14

INPUT—AUX

Wi

16

4+

QUTPUT-82.

LOAD

HH

«18

ToT

20!

wap

+4

Soe

it

“2650

100

500

IK

5K

10K.

50K

FREQUENCY

(Hz)

TRIPLETONE

CONTROL

iat

HF

ineut—aux

|

16

OUTPUT-82LOAD

ot

Math

TONE

SELECTOR-400Hz,

2KHz,

3KH2z

=H]

Bio

[|

|

Be

5

4

0

2h

wc

O

~2

-4

ar

eae

-8l

Secon

ally

50

100.

500

IK

BK

OK

SOKIOOK

|

FREQUENCY

(Hz)

TRIPLETONE

CONTROL

18

6

INPUT—AUX

14

OUTPUT—82.

LOAD

ia

TONE,

SELECTOR-200Hz,

IKHz,6KHz

a8

a

i

36

bl

4

56

~2

a-4

6

-8

-10

ia

|

r

1250

100.

500

IK

BK

OK

SOK

I00K

FREQUENCY

(Hz)

{

|

50

(oe)

500

IK

SK

FREQUENCY

(Hz

1OK

HHH

|

Ll

mH

Ol

05

]

io)

10

50

POWER

OUTPUT

(W)

POWER

BANDWIDTH

[

mnt

BO

~-|

Q-2

!

2-3

INPUT—AUX

i

o,

OUTPUT-82

LOAD

Wy

OdB-50W,/0.5%

Ft

ct

1

I

L

|

SOK

—

20

——

Sansui AU-999 Troubleshooting guide

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