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°

Sansui AU-999 Troubleshooting guide

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