Sansui Au-6500 Troubleshooting guide

OPERATING

INSTRUCTIONS

&

SERVICE

MANUAL

_

AM/FM

STEREO

AMPLIFIER

SANSUI

AU

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:

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SESSIONS

CAFAS

TL

SANSUI

ELECTRIC

CO.,

LTD.

We

are

grateful

for

your

choice

of

the

AU-6500

Integrated

Ampli-

fier.

For

over

a

quarter

of

a

century,

Sansui

has

been

building

hi-fi

audio

equipment,

and

nothing

else.

Our

mission

is

very

old

and

at

once

ever

new

to

us:

to

bring

the

reproduced

sound

closer

and

closer

to

the

original.

The

AU-6500

now

in

your

hands

is

one

answer

from

us

to

this

never-ending

quest.

It

is

a

product

of

the

cream

of

sophisticated

modern

audio-electronics

knowhow,

coupled

with

our

long

experi-

ence,

and

as

such,

we

present

it

to

you

with

our

full

confidence.

The

AU-6500

is

a

new

breed

of

Sansui’s

AU

series

integrated

amplifiers.

Its

tone

quality

has

been

polished

and

perfected

through

an

unprecedented

number

of

listening

tests

in

different

acoustic

environments.

We

feel

certain

that

you

will

like

it,

but

you

will

find

this

out

as

soon

as

you

play

your

first

record

through

it.

This

manual

has

been

prepared

to

guide

you

in

operating

and

caring

for

the

amplifier

correctly,

so

that

you

will

get

the

most

out

of

its

built-in

high

performance

and

exceptional

versatility.

May

we

suggest

that

you

read

it

once

carefully?

CONTENTS

SWITCHES

AND

CON

TROLS

sccescedoocsctireacaccsunmdanieee

ae

Oye

SETTING

UP

YOUR

AU-6500/

|

OPERATING

PROCEDURE

............

Eb

eamitneneteenotaiei

5,

6

RECORDING

AND

PLAYBACK

BY

TAPE

DECK

...............

7

UPGRADING

YOUR

STEREO

(4-CHANNEL

STEREO

SYSTEM/ELECTRONIC

CROSSOVER

SYSTEM)

......

8

SIMPLE

MAINTENANCE

HINTS/ACCESSORY

LIST......

9,10

QUICK

CHECK

LIST

OF

SIMPLE

MISTAKES..........0..0004,

1

SPECIFICATIONS:

cuasaiasirssumtucttues

cen

taduemencsatagateaneea

sti:

12

SCHEMATIC

DIAGRAM

........

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err

ee

P34

NOTES

TO

SERVICE

ENGINEERS

ccsareessestetetatentaeeuseus

15

GENERAL

TROUBLESHOOTING

CHART

.......

cee

16

DISASSEMBLY

PROCEDURE:

Ss

.cannctuiscitsaticanenintimeicats

17

PTE

ING

aa

ats

cestoctersen

ears

spr

rors

eoeestoe

aah

acai

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18

PRINTED

CIRCUIT

BOARDS

AND

PARTS

LIST.........

19~24

OTHER

PARTS

AND

THEIR

POSITION

ON

CHASSIS...

25,

26

VOLUME

Sansai

StenEC

AMPLIFIER

Aue

SPEAKERS

4-CH

TAPE

ALAPTOR

MONITOR

BUTIRNG

LOUDNESS

MODE

LA

RII

I

LIISA

LALA

IOLA

IRL

ALESIS

ALIA

BE

HT

SWITCHES

AND

CONTROLS

Power

Indicator

.

Lights

when

you

turn

on

the

Power/Speakers

Switch,

and

remains

lit

until

you

turn

off

the

switch.

Power/Speakers

Switch

Controls

both

the

power

supply

and

selection

of

speaker

systems.

|

POWER

OFF:

Cuts

off

power

supply

for

the

amplifier.

A:

Turns

on

power

supply

and

energizes

the

speaker

systems

connected

toSYSTEM-A

speaker

terminals

on

the

rear.

|

Because

of

the

built-in

amplifier/speaker

protec-

tion

circuit,

sound

will

come

out

with

a

delay

of

a

few

seconds.

B:

Energizes

speaker

systems

connected

to

SYSTEM-B

speaker

terminals.

A+B:

Energizes

both

A

and

B

pairs

of

speaker

systems.

SPKR

OFF:

Cuts

off

the

sound

from

all

speaker

systems

to

permit

private

listening

with

head-

phones

connected

to

the

Headphone

Jack.

Headphone

Jack

Plug

stereo

headphones

into

this

jack

for

private

listening

or

monitoring,

but

be

sure

to

turn

the

Power/Speakers

Switch

to

SPKR

OFF

first

unless

someone

is

listening

to

the

sound

from

speaker

systems

in

another

room.

The

jack

will

accept

any

standard

stereo

phone

plug,

but

for

best

tone

quality,

we

recommend

a

dynamic

type

such

as

the

Sansui

SS-20

or

SS-10.

Filters

,

Low:

Push

down

to

IN

to

eliminate

low-fre-

quency

noise

such

as

the

rumbling

of

your

turn-

table

motor.

If

no

such

noise

is

present,

be

sure

to

keep

it

off.

High:

Push

down

to

IN

to

eliminate

high-fre-

quency

noise

such

as

the

surface

noise

from

a

worn

record

or

as

the

fluorescent

lamp

noise

mixed

in

radio

broadcasts.

Tone

Controls

Let

you

tailor

the

tone

quality

of

reproduced

sound

to

your

taste

by

adjusting

the

amplifier’s

frequency

response

curve.

The

Bass

Control

is

for

adjust-

ing

the

loudness

of

bass

notes

as

may

be

produced

by

a

bass,

and

the

Treble

one

for

adjusting

that

of

treble

notes

as

may

be

produced

by

cymbals.

—

Muting

Switch

Reduces

the

sound

volume

by

20dB

at

once

with-

out

the

use

of

the

Volume

Control.

Most

con-

venient

to

lower

the

sound

volume

temporarily

when

the

telephone

rings,

to

avoid

the

noise

of

the

pickup

stylus

descending

on

a

record,

etc.

Balance

Control

Push

down

the

Mode

Switch

to

MONO

once

and

adjust

this

control

for

equal

sound

volume

from

the

left

and

right

speaker

systems,

then

return

the

switch

to

STEREO.

If

there

is

a

large

dif-

ference

in

the

sound

volumes

from

the

two

speak-

er

systems

even

with

this

control

set

near

the

center,

it

may

be

because

the

left

and

right

output

signal

levels

from

the

program

source

component

(turntable,

tuner,

tape

deck,

etc.)

are

different.

Check

the

component

once.

__-

Mode

Switch

The

STEREO

position

is

normal.

If

you

connect

a

monophonic

signal

to

either

left

or

right

input

terminal,

it

is

heard

from

both

speaker

systems

by

pushing

down

to

MONO.

——

Loudness

Switch

If

desired,

push

down

to

IN

to

emphasize

the

highs

and

lows

when

listening

at

low

volume

levels.

This

is

because

the

mechanism

of

human

hearing

is

such

that

the

high

and

low

notes

seem

greatly

enfeebled

at

low

listening

levels.

Velanie

Control

Selector

Control

Turn

to

an

appropriate

position

to

hear

the

de-

sired

program

source.

PHONO-2,

PHONO-1:

To

play

records

on

a

turntable

connected

to

the

PHONO

2

or

1

termi-

nals

on

the

rear.

TUNER:

To

hear

a

aid:

broadcast

from

a

tuner

connected

to

the

TUNER

terminals

on

the

rear.

AUX:

To

reproduce

whatever

program

source

1s

connected

to

the

AUX

terminals

on

the

rear.

(Connect

a

turntable

with

a

crystal

or

ceramic

cartridge,

the

audio

outputs

of

a

television,

the

playback

outputs

of

a

tape

recorder,

etc.

to

the

AUX

terminals.)

|

Tape

Monitor

Switch

Push

down

to

PLAYBACK

to

reproduce

a

recorded

tape

or

monitor

a

recording

as

you

make

it

on

a

tape

deck

connected

to

the

amplifier

(monitoring

is

possible

only

if

the

tape

deck

is

equipped

with

separate

recording

and

playback

heads).

Otherwise,

be

sure

to

keep

it

at

SOURCE.

4-Channel

Adaptor

Switch

If

you

connect

a

4-channel

adaptor

to

the

AU-

6500

and

make

other

necessary

connections,

you

can

upgrade

this

2-channel

stereo

amplifier

to

hear

4-channel

stereo

sound

by

pushing

this

switch

down

to

IN.

(refer

to

page

8).

Otherwise,

be

sure

to

keep

it

off.

SETTING

UP

YOUR

AU-6500/

OPERATING

PROCEDURE

GROUNDING

OF

TURNTABLE

‘2

wz

|

KAKE

)-

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a

|

x

AC

OUTLETS

FOR

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E

NT

TURNTABLE

ee

aa

nat

(With

Magnetic

Cartridge)

—

.

|

4-CHANNEL

STEREO

|

CONNECT

OUTPUTS

OF

SYSTEM

(SEE

PAGE

8)

AUXILIARY

COMPONENT

Ty

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eun

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|

-

;

S

meme

AU

-6500

Eiwee®

STEREO

AMPLIFIER

SANSUD

ELECTRIC

ca.

tTo

PRE-MAIN

CONNECTORS

|

ELECTRONIC

CROSSOVER

SYSTEM

(SEE

PAGE

8)

RECORD

a

eee

2

|

PLAYBACK

WALL

AC

OUTLET

SPEAKER

SYSTEMS

DIN

RECORD/

PLAYBACK

CABLE

NOTE:

Do

not

connect

tape

deck(s)

to

jack

terminals

and

DIN

socket

simultane-

ously.

LEFT

CHANNEL

woe

RIGHT

CHANNEL

Connecting

Speaker

Systems

If

you

are

connecting

only

one

pair

of

speaker

systems

to

the

AU-6500,

they

may

have

any

im-

pedance

from

4

to

16

ohms.

Connect

them

to

the

SYSTEM-A

or

-B

terminals

on

the

rear,

making

sure

not

to

confuse

the

left

and

right

cables,

plus

and

minus

leads

on

the

amplifier

and

speaker

ends.

But

if

you

wish

to

connect

two

pairs

of

speaker

systems

and

drive

them

simultaneously

by

turning

the

Power/Speakers

Switch

to

A+B,

each

speaker

system

should

have

impedance

of

8

to

16

ohms.

Using

a

system

with

lower

impedance

could

result

in

a

breakdown

of

the

amplifier.

Connecting

a

Turntable

Connect

it

to

the

PHONO

1

or

2

terminals

on

the

rear.

Fot

best

results,

use

a

turntable

with

a

magnetic

pickup

cartridge.

Connecting

a

Tuner

Connect

the

output

terminals

of

a

tuner

to

the

TUNER

input

terminals

on

the

amplifier’s

rear

panel.

Connecting

Grounding

Be

sure

to

connect

the

grounding

terminal

(or

lead)

of

the

turntable

and

tuner

to

the

grounding

termi-

nal

of

the

amplifier.

It

may

suppress

the

hum

noise

which

may

otherwise

occur.

PRE

MAIN

OUTPUT

INPUT

Operating

Procedure

1.

Set

the

Selector

Control

to

the

desired

program

source.

2.

Set

the

4-Channel

Adaptor

Switch

to

OUT

and

the

Tape

Monitor

Switch

to

SOURCE,

unless

you

want

to

use

them.

3.

Set

the

Power/Speakers

Switch

to

as

required.

4.

Start

the

program

source

component

and

play

the

program

source.

5.

Use

the

amplifier’s

other

controls

and

switches

to

suit

your

taste

or

room

acoustics.

Note:

To

play

a

monophonic

record

on

a

stereo

turntable,

follow

the

same

procedure

as

for

playing

a

stereo

record.

Better

results

are

normally

obtained.

|

RECORDING

AND

PLAYBACK

BY

TAPE

DECKS

Connecting

a

Tape

Deck

Connect

the

input

terminals

of

a

tape

deck

to

TAPE

REC

terminals

of

the

amplifier,

and

its

output

termi-

nals

to

the

PLAY

terminals.

The

DIN

socket

can

be

used

only

if

your

tape

deck

is

equipped

with

a

similar

socket.

It

is

manu-

factured

according

to

the

German

industrial

standard

to

permit

tape

recording

and

playback

from

a

single

cable

with

a

special

5-pin

plug

on

each

end.

Should

you

wish

to

connect

more

than

two

tape

decks,

you

may

connect

it

to

the

4-CH

ADAPTOR

terminals.

The

2-CH

OUTPUT

terminals

have

the

same

electrical

function

as

the

REC

terminals,

while

the

INPUT

terminals

are

equivalent

to

the

PLAY

terminals.

Note:

Do

not

connect

the

tape

deck(s)

to

the

jack

terminals

and

DIN

socket

simultaneously.

:

es

TAPE

se

az

4-CH

ADAPTOR

2-CH

REO

YPLAY

REC

PLAY

GUTPUT

INPUT

fom

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‘9oao00d.

eek

RECORD—_.

|

PLAYBACK

DIN

RECORD/

PLAYBACK

CABLE

NOTE:

Do

not

connect

tape

deck(s)

to

jack

terminals

and

DIN

socket

simultane-

wm

RIGHT

CHANNEL

ously.

===

LEFT

CHANNEL

Recording

&

Playback

Procedure

Recording

1.

Set

the

Selector

Control

to

the

program

source

you

wish

to

record.

2.

Adjust

the

recording

volume

control

of

the

tape

deck

to

preset

the

recording

level.

3.

Start

the

tape

deck

in

the

recording

mode.

4.

To

monitor

the

recording

as

you

make

it,

push

down

the

Tape

Monitor

Switch

to

PLAYBACK.

Be

sure

to

set

the

monitor

switch

of

the

tape

deck

to

the

playback

mode

as

well.

Playback

1.

Set

the

Tape

Monitor

Switch

to

PLAYBACK.

2.

Start

the

tape

deck

in

the

playback

mode.

3.

Use

the

amplifier’s

other

switches

and

controls

to

suit

your

taste

or

room

acoustics.

Procedure

for

Copying

a

Recorded

Tape

Oo

If

you

want

to

copy

a

recorded

tape,

connect

one

tape

deck

for

playback

to

the

TAPE

terminals,

the

other

for

recording

to

the

4-CH

ADAPTOR

termi-

nals.

©

By

operating

the

4-Channel

Adaptor

Switch,

you

can

monitor

the

recording

as

you

copy

it

from

one

tape

deck

to

the

other.

To

monitor

the

recording

before

it

is

copied,

keep

the

4-Channel

Adaptor

Switch

at

OUT.

To

monitor

the

recording

after

it

is

copied,

push

down

to

IN.

Notes

about

Recording

1.

Monitoring

of

recorded

sound

is

possible

only

if

the

recording

tape

deck

is

equipped

with

separate

heads

for

recording

and

playback.

Otherwise,

set

the

Tape

Monitor

Switch

to

SOURCE

and

listen

to

the

original

input

sound

before

it

is

recorded.

2.

The

various

switches

and

controls

on

the

AU-

6500

do

not

affect

the

sound

recorded

into

the

tape

deck.

They

only

adjust

the

sound

from

the

speaker

systems

or

headphones.

UPGRADING

YOUR

STEREO

4-Channel

Stereo

System

The

sound

we

hear

daily

is

a

mixture

of

the

sound

that

reaches

our

ears

straight

from

the

sound

source—be

it

a

musical

instrument,

a

jet,

a

man’s

mouth

cr

what

have

you—and

the

‘indirect

sounds’

that

arrive

at

our

earsonly

after

they

are

reflected

off

various

surfaces,

such

as

the

walls,

ceiling

and

so

forth.

Four-channel

recordings

are

made

using

two

microphones

in

the

front

of

the

concert

hall

and

two

in

the

rear

(to

simplify

the

explanation).

The

‘indirect

sounds’

with

their

complicated

waveforms

are

mainly

picked

up

by

the

two

microphones

in

the

rear,

and

reproduced

out

of

the

two

rear

speakers

in

a

4-channel

stereo

set-up

for

greatly

enhanced

‘ambience’

effects.

The

effect

is

almost

as

if

the

original

live

performance

were

re-played

right

in

your

own

room.

|

This

new

approach

can

now

be

yours

simply

by

adding

certain

equipment—mainly,

a

Sansui

4-

channel

rear

amplifier

with

its

unique

QS

(RM)

synthesizer

decoder

matrix

(patents

pending),

and

a

second

pair

of

speaker

systems—to

your

2-channel

stereo

system.

Connection

of

such

a

rear

amplifier

or

4-channel

adaptor

is

easy.

Just

connect

the

4-

CH

ADAPTOR

2-CH

OUTPUT

terminals

of

the

AU-6500

with

the

input

terminals

of

such

rear

amplifier

or

4-channel

adaptor,

then

connect

its

4-

CH

ADAPTOR

INPUT

terminals

with

the

output

terminals

of

such

unit.

To

operate

the

rear

amplifier

or

4-channel

adaptor

so

connected,

push

the

4-Channel

Adaptor

Switch

on

the

amplifier’s

front

panel,

and

otherwise

follow

its

manufacturer’s

instructions.

Electrically,

the

4-CH

ADAPTOR

2-CH

OUTPUT

and

INPUT

terminals

possess

the

some

functions

as

the

TAPE

REC

and

MON

terminals,

respectively.

4-CHANNEL

REAR

AMP.

4-CHANNEL

ADAPTOR

Electronic

Crossover

system

The

electronic

crossover

system

affords

these

ad-

vantages:

1.

It

enables

the

tweeters,

midranges

and

woofers

to

be

driven

by

separate

power

amplifiers.

So

you

can

make

optimum

use

of

speakers

of

different

im-

_

pedances

and

efficiencies,

as

well

as

power

amplifiers

of

different

output

capacities

and

tone

qualities.

2.

It

eliminates

the

need

for

the

conventional

LC

type

crossover

network.

With

the

electronic

cross-

over

divider,

the

amplifier’s

damping

factor

is

no

longer

affected

and

you

can

set

crossover

frequencies

as

you

like.

Electronic

Crossover

System

Using

the

AU-6500

The

preamplifier

and

power

amplifier

sections

of

the

AU-6500

can

be

disconnected

for

independent

usage,

the

latter

section

being

available

for

driving

a

separate

speaker

in

an

electronic

crossover

system.

To

build

such

a

system,

you

will

need

two-

or

three-

way

speaker

systems

and

an

electronic

crossover

divider,

along

with

at

least

one

or

two

additional

power

amplifiers.

Connection

is

not

all

that

difficult.

First

remove

the

Pre-Main

Connectors

uniting

the

amplifier’s

pre-

amplifier

outputs

and

main

(power)

amplifier

inputs.

Then

just

connect

the

PRE

OUTPUT

to

the

input

terminals

of

the

electronic

crossover

divider,

which

divides

the

input

signals

into

high,

medium

and

low

range(s).

Finally,

couple

the

separate

output

term1-

nals

of

the

electronic

crossover

divider

to

the

ampli-

fier’s

MAIN

INPUT

and

the

additional

power

ampli-

fier(s),

feeding

their

outputs

separately

into

in-

dividual

speakers,

as

illustrated

below.

ELECTRONIC

CROSSOVER

DIVIDER

PROGRAM

70)

8]

£69

WOOFER

SIMPLE

MAINTENANCE

HINTS

/ACCESSORY

LIST

Rear-Panel

AC

Outlets

Of

the

three

AC

outlets

provided

on

the

rear

panel,

the

ones

marked

‘SWITCHED?’

are

controlled

by

the

front-panel

Power/Speakers

Switch.

The

third

one,

marked

‘UNSWITCHED,’

is

always

‘live’

and

independent

of

the

Power/Speakers

Switch.

The

voltage

delivered

at

these

AC

outlets

is

the

same

as

the

power

supply

voltage

used.

The

two

‘SWITCHED’

outlets

have

a

total

power

capacity

of

100

VA,

while

the

UNSWITCHED

one

150VA.

Before

you

connect

any

appliance

to

them,

be

sure

that

it

is

adjusted

for

use

at

the

same

power

supply

voltage,

and

that

its

power

consumption

is

not

beyond

these

figures.

Otherwise,

serious

danger

could

result.

Make

Proper

Connections

Connect

the

loadwires

of

speaker

cables

properly.

If

they

are

loose

or

touch

other

parts,

the

amplifier

may

produce

noise

and

eventually

break

down.

Also,

before

connecting

a

turntable,

tuner

and/or

tape

deck,

be

sure

to

read

their

manufacturers’

instructions.

CONNECTING

SHIELDED

CABLE

TO

A

PLUG

(l)

REMOVE

PLUG

COVER

4

PLUG

({7//LLA

CCC

WS

SANS

JACK

a

it

~

i

SEWER

=

ye

:

CUT

OFF

EXCESS

a.

aN

Speaker

Impedance

Do

not

ever

connect

two

pairs

of

speaker

systems

with

impedance

of

less

than

8

ohms

each.

Doing

so

will

reduce

the

composite

speaker

impedance

in

each

channel

to

less

than

4

ohms,

and

may

cause

the

quick-acting

fuses

to

blow

or

result

in

a

more

serious

breakdowns

over

a

long

period

of

time.

Phasing

of

Speakers

Listen

to

any

monophonic

reproduction.

If

the

speak-

er

systems

are

correctly

phased,

the

sound

will

seem

to

come

from

a

point

midway

between

the

left

and

right

speaker

systems.

If

the

sound

is

not

directly

in

front

of

you,

however,

the

speaker

systems

are

out

of

phase.

If

you

notice

this

condition,

check

the

speaker

connections

once.

To

correct

the

condition,

switch

the

amplifier

off

and

reverse

the

connection

of

plus

and

minus

leadwires

of

one

speaker

cable.

Also,

be

careful

not

to

connect

a

single

speaker

system

between

the

SYSTEM-A

and

SYSTEM-B

terminals

by

mistake.

Howling

and

Hum

Take

care

never

to

place

a

turntable

on

or

too

near

a

speaker

system,

or

the

vibration

produced

by

the

speaker

system

is

transmitted

and

causes

an

oscillat-

ing

phenomenon

called

howling.

It

is

best

to

keep

these

components

completely

separated,

but

if

this

is

impossible,

place

a

thick

cushion

between

them.

Humming,

in

contrast,

is

a

phenomenon

caused

by

incomplete

or

incorrect

turntable-amplifier

connect-

tions.

Should

this

occcur,

check

to

see

if

all

con-

nections

are

completely

made

and

if

the

connecting

cables

are

sufficiently

thick.

Hum

noise

may

some-

times

be

eliminated

by

connecting

the

grounding

lead

of

the

turntable

to

the

GND

terminal

on

the

amplifier’s

rear.

Voltage

Adjustment

Your

AU-6500

is

adjusted

to

operate

at

the

correct

power

supply

voltage

of

your

area

prior

to

shipment

from

our

factory.

If

you

move

after

purchasing

it

or

send

it

as

a

gift

to

a

friend

living

in

an

area

where

the

voltage

is

different,

it

may

be

necessary

to

adjust

its

Voltage

Selector.

To

adjust

it,

remove

the

two

screws

securing

the

name

plate

on

the

rear,

then

set

the

arrow

mark

on

the

Voltage

Selector

Plug

to

the

correct

voltage

indication

(100,

117,

220,

or

240

volts).

Also,

it

may

by

necessary

to

replace

the

power

fuse

as

will

whenevr

the

voltage

has

changed.

For

opera-

tion

at

100—117

volts,

use

a

3-ampere

fuse.

For

operation

at

220—240

volts,

use

a

2-ampere

one.

CAD

emmmene

omen

VT

220V——-

i

IOOV

240V

Ti7v

ae:

‘©

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TOOV

220V

(2A)

240Van

117V

Ct

|

©)

220V

T00V

240V

(2A)

Heat

Radiated

inside

the

Amplifier

The

bonnet

of

the

AU-6500

is

designed

so

that

any

heat

radiated

inside

will

effectively

escape

through

it.

Proper

care

should

therefore

be

taken

of

the

dissipation

of

such

heat

if

you

wish

to

place

some-

thing

on

top

of

the

amplifier

or

place

it

inside

a

closed

box,

etc.

Above

all,

avoid

placing

it

where

it

may

be

exposed

to

the

direct

sunlight.

It

is

prohibited,

however,

to

remove

the

amplifier’s

bonnet

or

bottom

plate

to

improve

the

ventilation.

Accessory

List

1.

OPERATING

INSTRUCTIONS

AND

SERVICE

MANUAL

.......0..-0

008%

1

2.

OPERATING

INSTRUCTIONS

SHEET

....

1

3.

PLUGS

sachs

cetwacciaemekneaeee

notes

4

As

BUTTERELY

BOLTS

scicnsiiactsavedoek

2

Bu,

WASHERS

ccaccavensidnacnaunedaucdennwes

2

6.

POLISHING

CLOTH...........0

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1

7.

QUICK-ACTING

FUSES

(3A)........2

00ers

2

4G

4

QUICK

CHECK

LIST

OF

SIMPLE

MISTAKES

Some

of

the

troubles

which

seem

to

result

from

a

malfunction

of

the

amplifier

are

caused

by

wrong

operation

and

the

negligence

of

simple

maintenance,

and

can

be

quickly

corrected

by

making

a

simple

investigation

and

providing

simple

cures.

To

make

sure

you

haven’t

made

any

of

these

mistakes,

go

over

the

following

check

list

once.

Connections

1.

Have

you

connected

the

power

cord

to

a

wall

AC

outlet

?

O

2.

Are

the

connecting

cables

for

the

turntable

and

tape

deck

not

loose

?

|

3.

Are

the

speaker

cables

not

loose

from

amplifier’s

jacks

or

the

speaker

systems?

4.

Do

your

speaker

systems

have

impedance

of

8

ohms

more?

(They

must,

if

you

wait

to

drive

two

pairs

at

one

time.)

5.

Have

the

power

fuse

or

quick-acting

fuses

not

blown?

Operating

Procedure

1.

Have

you

turned

on

the

Power/Speakers

Switch?

2.

Is

the

Tape

Monitor

Switch

not

set

to

PLAY-

BACK

position,

though

you

don’t

want

to

reproduce

a

tape?

|

3.

Is

the

Selector

Control

set

to

the

correct

position?

4.

Is

the

Power/Speakers

Switch

set

to

the

correct

position

?

5.

Is

the

4-Channel

Adaptor

Switch

not

pushed

down,

though

you

are

not

using

a

4-channel

rear

amplifier

or

adaptor

?

If,

even

after

these

examinations,

the

amplifier

does

not

return

to

normal,

it

may

be

faulty.

Contact

the

Sansui

dealer

from

whom

you

purchased

the

am-

plifier

or

your

nearest

Sansui

Authorized

Service

Station.

Do

not

attempt

opening

the

bonnet

for

yourself.

Such

repair

must

be

left

to

a

qualified

serviceman.

Should

the

Power

Fuse

Blow

If

no

Power

Indicator

should

glow

and

the

ampli-

fier

simply

remains

dead

even

after

you

have

turned

on

its

power

fuse

has

blown.

If

this

happens,

dis-

connect

the

power

cord

from

the

wall

AC

outlet

at

once

and

examine

the

power

fuse

on

the

rear

panel.

If

you

find

it

blown,

replace

it

with

a

new

glass-

tubed

fuse

of

the

rated

capacity

(3-ampere

for

100

‘to

117

volts,

2-ampere

for

220

to

240

volts).

Never

use

a

fuse

of

a

different

capacity

or

a

piece

of

wire,

even

as

a

stop-gap

measure,

or

serious

danger

could

result.

Reploce

with

same

type

3A-250V

fuse

ot

100/117¥

2A-250V

fuse

at

220/240V

Vane

on

ve

%

«

is

%

te

y

_"

Quick-Acting

Fuses

The

AU-6500

is

doubly

protected

with

a.

relay-

equipped

protection

circuit

and

four

quick-acting

fuses.

If

no

sound

or

distorted

sound

is

heard

from

either

or

both

speaker

systems,

switch

off

the

ampli-

fier,

disconnect

the

power

cord

from

the

wall

AC

outlet,

remove

the

cover

on

the

rear

panel

conceal-

ing

the

quick-acting

fuses

and

examine

them.

If

you

find

any

of

them

blown,

find

and

eliminate

the

cause

of

the

blowout,

then

replace

it

with

a

new

glass-tubed

quick-acting

fuse

supplied.

If

the

relay-equipped

protection

circuit

ever

goes

to

work,

the

sound

may

come

out

intermittently.

If

it

happens,

check

the

connections

of

various

equip-

ment

and

your

operating

procedure

once.

es

|

SPECIFICATIONS

QC,

eGO"“_—_—

POWER

OUTPUT

SWITCHES

&

CONTROLS

IHF

MUSIC

POWER:

94W

(4)

at

1,000Hz

BASS:

+15dB,

—15dB

at

50Hz

CONTINUOUS

RMS

POWER

TREBLE:

+.

15dB,

—15dB

at

15,000Hz

(each

channel

driven):

—

32/32W

(8Q)

at

1,000Hz

LOUDNESS:

+10dB

at

ne

+

8dB

-

|

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RMS

POWER

|

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cia

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FILTER:

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at

10,000Hz

(6dB/oct)

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SEMICONDUCTOR:

transistors;

35

diodes;

6

INTERMODULATION

DISTORTION

(70Hz:7

,QOOOHz

=4:1

SMPTE

method):

less

than

0.1%

at

rated

output

IHF

POWER

BANDWIDTH

POWER

REQUIREMENTS:

100,

117,

220,

240V

50/60Hz

POWER

CONSUMPTION

(each

channel

driven

at

8Q)):

ee

—

5

to

40,000Hz

:

a

FREQUENCY

RESPONSE

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1Watt

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outpnt)

DIMENSIONS:

po

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and

2:

RIAA

equalization

curve

322mm

(1

2y,")

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+0.5dB

(30

to

15,000Hz)

AUX:

10

to

30,000Hz

+1.0dB

WEIGHT:

11.5kg

(25.3

Ibs)

MAIN

INPUT:

10

to

40,000Hz

+1.0dB

LOAD

IMPEDANCE:

4

to

160,

DAMPING

FACTOR:

approximately

40

at

822

load

INPUT

SENSITIVITY

AND

IMPEDANCE

(at

1,Q00HZz)

PHONO-1:

2.5mV

(50kQ)

PHONO-2:

2:5mV

(50k)

(Maximum

input

capability

300mV

THD

:

less

than

0.5%)

TUNER:

100mV

(50kQ)

AUX:

100mV

(50kQ))

TAPE

PLAY

(Pin):

100mV

(50kQ))

TAPE

REC/PLAY

(DID):

=

100mV

(50kQ))

4-CH

ADAPTOR:

100mV

(50kQ)

MAIN

INPUT:

g00mV

(40kQ)

OUTPUT

VOLTAGE(at

1,000HZz)

TAPE

REC

(Pin):

100mV

TAPE

REG/PLAY

(DIN):

30mv

4-CH

ADAPTOR:

100mV

PRE

OUTPUT:

0.8V

(THD:

less

than

0.08%)

(Maximum

Output

Voltage

4.0V

THD:

less

than

0.5%)

CROSSTALK

(at

rated

output,

1,000HZz):

PHONO-1:

better

than

50dB

PHONO-2:

better

than

50dB

TUNER:

better

than

50dB

AUX:

.

better

than

50dB

MAIN

INPUT:

better

than

50dB

IHF

HUM

AND

NOISE

PHONO-1:

-

better

than

70dB

PHONO-2:

|

better

than

70dB

TUNER:

|

better

than

80dB

AUX:

|

better

than

80dB

MAIN

INPUT:

_

better

than

100dB

—

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NOTES

TO

SERVICE

ENGINEERS

MM

Please

-contact

the

nearest

Sansui

Authorized

Service

Station

for

replacement

parts.

When

order-

ing

them,

look

up

the

part

lists

on

pages

19

to

26

and

let

us

know

(1)

the

amplifier’s

model

number,

2)

name

of

the

printed

circuit

board,

(3)

part

No.,

(4)

name

of

the

part,

and

(5)

its

stock

No.

Using

nonstandard

parts

for

temporary

relief

often

impairs

the

sound

quality

and

over-all

reliability

of

the

amplifier.

Please

take

the

trouble

to

contact

your

nearest

Sansui

Authorized

Service

Station.

Mi

Consult

pages

17

to

26

when

making

repairs

or

adjustments.

To

check

or

measure

the

amplifier

performance,

connect

load

resistance

of

4

to

16

ohms

to

the

amplifier’s

speaker

output

terminals

first.

To

check

the

electrical

output

characteristics,

do

not

remove

the

bonnet

and

bottom

plate.

GENERAL

TROUBLESHOOTING

CHART

PROGRAM

SOURCE

SYMPTOM

PROBABLE

CAUSE

|

WHAT

TO

DO

Tuner.

*

Noise

during

AM

recep-

|

*

Interference

by

adjacent

sta-

|

*

Peculiar

to

AM

waves,

and

unavoid-

tion.

tions

(called

beat

interfer-

able

to

some

extent.

ence).

*

TV

set

is

being

used

simul-

|

*

Move

TV

set

away

from

tuner

and

taneously.

amplifier.

Noise

heard

at

certain

|

*

Interference

by

nearby

elect-

|

*

Attach

noise

limiter

to

appliance

hours,

in

certain

areas

rical

appliances.

producing

noise.

oe

over

part

of

dial

*

In

some

cases,

can

be

eliminated

by

uring

AM

reception.

reversing

power

cord

plug-AC

outlet

connections.

Pop

noise

during

FM

|

*

Ignition

noise

from

nearby

|

*

Adjust

antenna

location

and

height

reception.

automobile,

motorcycle,

etc.

for

maximum

sensitivity.

*

Keep

antenna

away

from

streets.

Note:

In

many

cases,

high-frequency

noise

during

radio

reception

cannot

be

entirely

eliminated.

Try

turning

on

amplifier’s

High

Filter

Switch

or

turning

Treble

Control

counterclockwise.

Turntable.

Hum

noise.

*

Unshielded

cables

used

to

|

*

Use

regular

shielded

cables.

connect

turntable.

*

Examine

connecting

cables,

especial-

*

Minus

(ground)

wire

of

con-

ly

their

plugs.

stones

a

1s

not

connect-

|

*

Connect

grounding

lead

of

turntable

ea

completely.

to

amplifier’s

GND

terminal.

*

Turntable

motor

or

tonearm

is

not

grounded.

Loud

oscillating

noise.

*

Turntable

is

placed

on

top

|

*

Place

thick

cushion

between

turntable

of

or

too

close

to

speaker

and

speaker

systems.

*

Change

location

of

turntable

and

speaker

systems.

*

If

using

microphone(s),

move

or

direct

them

away

from

speaker

systems

Sound

is

shaky.

*

Dust

on

record

or

pickup

|

*

Clean

record

and

pickup

stylus.

7

stylus.

-*

Replace

pickup

stylus.

*

Worn

pickup

stylus.

*

Adjust

stylus

pressure.

*

Improper

stylus

pressure.

Tape

Deck.

Hiss

noise.

*

Magnetic

heads

are

magnet-

|

*

Demagnetize

heads.

ized.

*

Turn

on

High

Filter

Switch.

*

Connect

noise

reduction

adaptor.

Sound

is

not

clear.

*

Dust

on

magnetic

heads.

*

Clean

heads.

*

Tape

is

not

pressed

tight

to

|

*

Align

tape

transport

mechanism.

heads.

7

General.

When

left

and

right

|

*

Left

and

right

channel

|

*

Never

mind.

Optimum

stereo

effect

channel

sound

volumes

are

balanced

with

ampli-

fier’s

Balance

Control,

it

does

not

come

to

center

position.

Musical

and

singer

not

located

clearly.

Want

to

listen

at

very

low

volume

level

at

night.

instruments

*

is

obtained

by

adjusting

Balatice

Control

so

that

sound

comes

from

Left

and

right

speaker

sys-

midway

point

between

two

speaker

tems

have

different

efficien-

systems

with

Mode

Switch

set

to

cies.

MONO.

signal

strengths

vary

with

program

source.

Left-right,

plus-minus

con-

|

*

Examine

connections

once.

nections

of

speaker

systems,

input

cables

are

wrong.

*

Turn

on

Muting

Switch,

then

adjust

Volume

Control.

Fine

adjustment

of

very

low

volume

cannot

be

done

with

Volume

Control.

2416

2

DISASSEMBLY

PROCEDURE

=

Lid

Zz

z

.o)

a

=)

<

he

ve)

=

SCREW

BOTTOM

PLATE

FRONT

PANEL

Sees

by

oe

ALIGNMENT

Output

of

Power

Amplifier

Current

Alignment

of

Power

Section

Amplifier

Section

STEP

CONNECT/ADJUST

REMARKS

step

|AMMETER|

CONNECT/ADJUST

[REMARKS

(TESTER)

1.

Remove

Foo.

and

Foo.

|

Use

1.

|

Connect

load

resistance

(8

ee

ene

ee

to

16

ohms)

to

left

(right)

2.

Turn

VRgo3

and

VRgox

|v.

channel

SYSTEM-A

fully

eaunterelociewise:

laa

speancraceminal:

3.

Turn

Power/Speakers

|

range.

Switch

to

SPKR

OFF.

Set

to

Connect

ammeter

100mA

where

Fo92

was.

(Con-

3.

|

Turn

Power/Speakers

?

range.

nect

(21)

on

schematic

|

Swith

to

SYSTEM-A.

,

2

to

minus

terminal

of

ammeter,

other

end

to

4.

Adjust

VRgo:

(VRgo2)

so

plus

terminal.)

that

voltmeter

indicates

5

Adjust

VRene

(left

chan-

0+50mA.

Repeat

above

eels

SO

that

Nee

procedure

for

right

chan-

‘nadicates

O08

to

Som

A

nel

(notations

in

parenthe-

ses

are

for

right

channel).

6.

Turn

off

Power/Speak-

|

ers

Switch

and

replace

Foo2

:

7.

|

Set

to

Turn

Power/Speakers

100mA

Switch

to

SPKR

OFF,

range.

then

connect

ammeter

where

Fo93

was.

(Con-

nect

(22)

on

circuit

schematic

to

minus

ter-

minal

of

ammeter,

other

end

to

plus

ter-

minal.)

8

.

Adjust

VReos

(right

channel)

so

that

am-

meter

indicates

28

to

32mA.

9.

Turn

off

Power/Speak-

ers

Switch

and

replace

Foos.

2.

|

Connect

voltmeter

in

par-

|

Set

voltmeter

to

allel

with

load

resistance.

|

0.5V~3V

range.

>

VR803

VR804

VR801-

PRINTED

CIRCUIT

BOARDS

AND

PARTS

LIST

W:

Parts

No.

X:

Parts

Name

Y:

Stock

No.

Z:

Position

of

Parts

DRIVER

BLOCK

<F-2034-A>

Stock

No.

7570680

w

|

x

|

y

|

z

w

|

x

oy

|

z

Reot

150k

0101154

|

2B

VRe03

1k

Q(B)

(Left)

1035070

|

1A,

B

Reo2

150kQ

0101154

|

2B

VR804

era

De

Wasnt:

(Right)}

1035070/18,C

Rso3

10kQ

0101103

|

2B

R804

10kQ,

.

0101103

|

2B

Cso1

ee

nye

0519101

|

2B

R805

47kQ

0101473

|

2A

C802

1

LF

;

0519101

|

2B

R806

A7kQ

0101473

|

2c

C803

pees

10%

s0V

cc

0660101

|

2B

R807

18kO

0101183

|

2A,

B

C804

100pF

0660101

|

2B

R808

18kQ

0101183

|

2B,C

C805

pees

ee

0515470

|

2A

Rso9

18kO,

0101183

|

2A

Cs06

47

uF

.

0515470

|

2C

R810

18kO

0101183

|

2c

C807

om

‘oy,

BEES

0531470

|

2A

Rat

3.3kQ

0101332

|

2A

Ceos

47

uF

0531470

|

2C

Rai2

3.3kQ

0101332

|

2C

Caos

PF

10

eis

ae

0660100

|

1A

Rei3

39.0,

0101390

|

2A

Cai0

10pF

0660100

|}

1C

R814

390

0101390

|

2C

Cait

yal

SOV

EC

0515470

|

1A

Rais

39

0101390

|

2A

Cai2

47

pF

0515470

|

1C

Raié

390,

0101390

|

2C

C813

0.

ont

Be

eau

We

0601477

|

1A

Rei7

18kQ,

0101183

|

2A

Cal4

0.047

uF

0601477

|

1C

Reis

18kQ,

0101183

|

2C

C815

aa

she

cee

0515101

|

1,2A

Reis

1.8kQ

0101182

|

2A

C816

100/HF

0515101

|

1,2C

Re20

1.8k0,

0101182

|

2C

C817

sn

Nee

eae

eG

0660220

|

2B

Rea

39kQ,

0101393

|

1,2A

Cais

22pF

0660220

|

2B

Rez2

39kO,

0101393

|

1,2C

Cai9

sal

sas

cee.

0510221

|

2B

Re23

220k0.

|

1994

YN

CR

0101224

|

1,2A

C820

220

uF

0510221

|

2B

Reo

220k0,

(

~

0101224

|

1,2C

Ce2r

|

a

an

ee

0515101

|

1,28

R825

—3.3k0,

0101332

|

2A

C822

—

1004F

0515101

|

1,28

R826

3.3k

0101332

|

2C

Rez

aa

0101103

|

1,2A

TReoi

0300450

|

2B

Re2s

10kQ,

0101103

|

1,2C

TR802

|

95,4493

(GR)

Seas

Naas

Re29

4.7kQ

0101472

|

1,2A

TRe03

0300450

|

2A

Reso

4.7kO,

0101472

|

1,2C

TRe04

0300450

|

2C

tm

|

win

ors)

|

28

rag

|

eva

oe

Rese

1800,

0101181

|

2B

Ra33

8200,

|

0101821

|

1B

TReo7

25C281

(B,

C)

0305121,

2;

1A

Res4

8200,

0101821

|

1B

TRe08

0305121,

2

|

10

Ress

3.3k0,

0101332

|

2A,

B

oe

25C959

(L,

M)

poe

:

Re36

3.3kQ,

0101332

|

2B,

C

Reaz

390,

0101390

|

1A

TRe11

25,4606

(L,

M)

0300211,

2

|

18

Ress

39.0

0101390

|

1C

TRei2

0300211,

2)

15

R39

1800,

0101181

|

1A

we

Sayi040

|

BA

Redo

1802,

0101181

|

1C

Sas

nase

(De

he

ten

ser

aL

Dg03

ree

0311040

|

2A

Re42

22029

0101221

|

1C

a

aanioael

ae

Res)

2200)

|

Adee

a

tid

Printed

Circuit

Board

F-2034

2570460

Res4

2202

0101221

|

1B,C

)

Re45

1.5kQ

|

0101152

|

1B

Ras6

1.5kQ

0101152]

1B

R8si

Pee

0%

IW

CR

0104100

|

1A

Re52

100

0104100

|

1C

R847

100

0101100

|

1A

Rs48

100

0101100

|

1C

Reso

a

Oe

aN

ER

0101100

|

1B

Reso

|

109

0101100

|

1B

VReo1

|

4.7kQ(B)

(Left)|

1035110

|

2A

VReo2

fae

AC

Balance

Adi.

(a:

ity}

1035110

|

2C

—

19

——

Sansui AU-6500 Troubleshooting guide

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