Marantz SC-8 User manual

MARANTZ

DESIGN

AND

SERVICE

Using

superior

design

and

selected

high

grade

components,

MARANTZ

company

has

created

the

ultimate

in

stereo

sound.

Only

original

MARANTZ

parts

can

insure

that

your

MARANTZ

product

will

continue

to

perform

to

the

specifications

for

which

it

is

famous.

Parts

for

your

MARANTZ

equipment

are

generally

available

to

our

National

Marantz

Subsidiary

or

Agent.

ORDERING

PARTS:

Parts

can

be

ordered

either

by

mail

or

by

telex.

In

both

cases,

MARANTZ

part

number

has

to

be

specified.

If

you

order

by

mail,

fulfil

MAR

ANTZ

order

forms.

MARANTZ

S.A.

EUROPEAN

PARTS

DEPARTMENT

2,

Avenue

Léopold

ill

B-7120

PERONNES-lez-BINCHE

BELGIUM

TWX:

57589

SEPLT

B

The

following

information

must

be

supplied

to

eliminate

delays

in

processing

your

order:

Complete

address

Complete

part

numbers

and

quantities

required

Description

of

parts

Model

number

for

which

part

is

required

Way

of

shipment

Signature:

any

order

form

or

telex

must

be

signed

otherwise

such

part

order

will

be

considered

as

null

and

void.

OOS

Ne

PARTS

ORDERING:

Parts

may

be

ordered

from

the

following

addresses:

EUROPE

MARANTZ

S.A.

MARANTZ

NORSKE

A.S.

MARANTZ

DENMARK

MARANTZ

GMBH

AUSTRIA

European

Parts

Department

Refstadalleen

13

Bregnergdvej

132b

Wiedner

Hauptstrasse

98

2,

Avenue

Léopold

Il

Oslo

5

3460

Birkergd

1050

Wien

B-7120

Péronnes-lez-Binche

Norway

Denmark

Austria

Belgium

Telex:

19659

Telex:

39137

Telex:

113583

Telex:

57589

MARANTZ

S.A.

MARANTZ

FRANCE

MARANTZ

BELGIUM

MARANTZ

SVENSKA

A.B.

326

Avenue

Louise

Bte

32

4

Rue

Bernard

Palissy

45

Rue

Auguste

Van

Zande

Svartviksvangen

56

1050

Brussels

92600

Asniéres

1080

Brussels

Traneberg

-

Box

12016

Belgium

France

Belgium

16112

Bromma

Telex:

26602

Telex:

611651

Sweden

Telex:

13449

MARANTZ

GERMANY

GMBH

MARANTZ

AUDIO

U.K.

LTD.

Max

Planckstrasse,

22

Unit

15/16

6072

DREIEICH

1

Saxon

Way

Industrial

Estate

West

Germany

Moor

Lane

Telex:

4185316

Harmondsworth

UB7

OLW

Great

Britain

Telex:

935196

AUSTRALIA

MARANTZ

AUSTRALIA

PTY.,

LTD.

32

Cross

Street

Brookvale,

N.S.W.

2100

Australia

Telex:

24121

All

of

the

above

locations

are

fully

equipped

to

take

care

of

your

total

service

needs.

Because

various

countries

have

dé

ffering

configuration

requirements,

it

is

necessary

that

you

contact

the

service

facility

in

your

particular

country.

In

the

ev

nt

that

there

is

no

service

location

listed

for

your

country,

please,

contact

the

nearest

facility

for

the

necessary

assistance.

In

case

of

difficulties,

do

not

hesitate

to

contact

the

Technical

Department

at

abovementioned

address.

ERR

en

Been

ERE

ZZ’

TABLE

OF

CONTENTS

SECTION

PAGE

INTRODUG

TION:

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TEST

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6.

DIAGRAM

AND

COMPONENT

LOCATIONS

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nes

4

6.1.

MC

Phono

Assembly

(P400)

Schematic

Diagram

and

Component

Locations

...........--

000+

eee

4

6.2

Balance

VR/Mode

Switch

Assembly

(PGOO)

Schematic

Diagram

and

Component

Locations

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

4

6.3.

Power

Supply

Assembly

(P800)

Schematic

Diagram

and

Component

Locations

...............-022005

7

6.4

L.E.D.

Assembly

(PY00)

Schematic

Diagram

and

Component

Locations

...............00

ees

eee

7

6.5

Input

Selector

Switch

Assembly

(PSO01)

Schematic

Diagram

and

Component

Locations

..............+.-:

8

6.6

Tone

Amp.

(L-Ch)

Assembly

(PEO1)

Schematic

Diagram

and

Component

Locations

...........-.+.005

8

6.7.

Loudness

Switch

&

Volume

Assembly

(PJ00)

Schematic

Diagram

and

Component

Locations

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

9

6.8

Headphone

Assembly

(PX00)

Schematic

Diagram

and

Component

Locations..............02

0000

eee

9

6.9

Tone

In/Out

Switch

Assembly

(PTOO)

Schematic

Diagram

and

Component

Locations

................-

9

6.10

Tone

Amp.

(R-Ch)

Assembly

(PE02)

Schematic

Diagram

and

Component

Locations

...............65.

9

7.

EXPLODED

VIEW

AND

PARTS

LIST

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PARTS:

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9.

TECHNICAL

SPECIFICATIONS

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24

MARANTZ

MODEL

Sc-8

STEREO

CONSOLE

AMPLIFIER

INTRODUCTION

This

service

manual

was

prepared

for

use

by

Authorized

Warranty

Staions

and

contains

service

information

for

the

Marantz

Model

Sc-8

Stereo

Console

Amplifier.

Servicing

information

and

voltage

data

included

in

this

manual

are

intended

for

use

by

knowledgeable

and

ex-

perienced

personnel

only.

All

instructions

should

be

read

carefully.

No

attempt

should

be

made

to

proceed

without

a

good

understanding

of

circuitry

operation.

The

parts

list

furnishes

complete

ordering

information.

Most

replacement

parts

should

be

ordered

from

the

Marantz

Company.

However,

a

simple

description

is

included

for

parts

which

can

be

obtained

locally.

1.

SHOCK,

FIRE

HAZARD

SERVICE

TEST

CAUTION:

After

servicing

this

appliance

and

prior

to

returning

to

customer,

measure

the

resistance

between

either

primary

AC

cord

connector

pins

(with

unit

NOT

connected

to

AC

mains

and

its

Power

switch

ON),

and

the

face

or

front

Panel

of

product

and

controls

and

chassis

bottom.

Any

resistance

measurement

less

than

1

Megohms

should

Cause

unit

to

be

repaired

or

corrected

before

AC

power

is

applied,

and

verfied

before

return

to

user/customer.

Ref.

UL

Standard

No.

1270.

Para.

66.

3.

D

(Mandatory

Test

after

servicing

Electrical

Appliances,

effective

7-1-83).

2.

FEATURES

@

MC

Head

Amplifier

(13

transistors

for

each

channel)

The

MC

head

amplifier

uses

a

push-pull

amplifier

in

the

first

stage

which

consists

of

4

very

low

noise

NPN

tran-

sistors

and

4

very

low

noise

PNP

transistors.

It

uses

also

push-pull

transistors

in

the

second

stage

and

an

SEPP

circuit

in

the

output

stage.

The

feedback

circuit

impedance

is

reduced

és

much

as

possible

to

improve

the

S/N

ratio,

and

a

voltage

gain

of

26

dB

(20

times)

is

obtained

at

a

rated

input

level

of

110

uV.

@

PHONO

Amplifier

(11

transistors

for

each

chamel!)

The

PHONO

amplifier

uses

full

push-pull

citcuits

con-

sisting

of

11

transistors

for

each

channel,

sc

low

TIM

distortion

and

a

high

S/N

ratio

are

obtained.

The

first

stage

is

a

push-pull

circuit

consisting

of

very

low

noise,

high

Gm

N

channel

and

P

channel

FETs,

combined

with

a

cascode

current

Miller

circuit

so

that

degradation

of

characterisitics

of

following

crcuits

due

to

input

stage

impedance

fluctuations

is

prevented.

The

second

stage

consists

of

an

emitter

follower

buffer

amplifier

and

a

push-pull

voltage

amplifier.

The

output

stage

uses

an

SEPP

circuit

which

s

adequate

to

any

type

of

load.

The

equalizer

elements

have

very

low

impedance

compared

with

conventiona

equalizer

circuits,

so

a

S/N

ratio

of

90

dB

is

obtained

a

the

rated

input

level.

The

equalizer

elements

used

are

metal

filn

resistors

with

tolerance

of

1%

and

polypropylene

capei

tors

with

tolerances

of

2%,

so

RIAA

phono

equalizationaf

/0.2

dB

is

obtained

over

the

audio

range

from

20

Hz

to?O

kHz.

The

input

impedances

of

27

kQ,

47

kQ

and

00

kQQ

are

provided

to

allow

different

cartridges

to

be

connected

when

the

PHONO

1

input

is

selected.

The

output

stage

is

provided

with

a

relay

tc

snute

un-

desireable

noise

when

the

power

is

switched

ON

and

OFF,

and

with

an

EQ

subsonic

filter

to

reduce

turnta

#e

rumble

and

flutter

noise.

e@

TONE

Switch

The

TONE

switch

allows

the

number

of

coupling

capa-

citors

to

be

reduced

to

one

by

applying

the

PHONO

amplifier

output

signal

directly

to

the

line

amplifier

when

the

switch

is

set

to

the

TONE

OUT

position.

The

gain

and

input

sensitivity

are

not

changed

by

operating

this

switch.

TONE

OUT

HEADPHONE.

OUT

@

Line

Amplifier

The

line

amplifier

consists

of

15

transistors

for

each

channel,

and

uses

push-pull

circuits

which

operate

in

class

A

in

all

stages

to

reduce

TIM

distortion

and

im-

prove

the

S/N

ratio.

The

input

stage

uses

a

source

follower

with

dual

FETs

to

prevent

it

(the

input

stage)

from

affecting

following

stage

characteristics.

The

source

follower

output

signal

is

applied

to

the

differential

amplifier

through

dual

transistors.

One

of

the

differential

amplifier

output

signals

is

phase-

inverted,

then

both

output

signals

are

applied

to

the

second

stage

push-pull

amplifier

through

buffer

amplifiers.

The

power

amplifier

stage

uses

newly

developed,

super

high

f7

(200

—

250

MHz)

power

transistors

which

are

connected

in

a

Darlington

configuration.

This

power

amplifier

stage

operates

in

pure

class

A,

and

features

flat

frequency

response

and

low

TIM

distortion.

This

amplifier

can

drive

headphones

in

class

A

operation,

as

well

as

a

main

amplifier.

3.

P.W.

BOARDS

As

can

be

seen

from

the

circuit

diagram

the

chassis

of

Model

Sc-8

consists

of

the

following

units.

Each

unit

mounted

on

a

printed

circuit

board

is

descrided

within

the

square

enclosed

by

a

bold

dotted

line

on

the

circuit

diagram.

1.

MCPhono.........

mounted

on

P.W.

Board

P400

2.

Power

Supply

......

mounted

on

P.W.

Board

P800

3.

Tone

Amp.

(L-Ch)

...

mounted

on

P.W.

Board

PEO1

4.

Tone

Amp.

(R-Ch)

...

mounted

on

P.W.

Board

PEO2

5.

Balance

VR/i

Mode

Switch

..

....

mounted

on

P.W.

Board

PGOO

6.

Loudness

Switch

&

Volume

......+-55

mounted

on

P.W.

Board

PJOO

7.

Input

Selector

Switch

.

mounted

on

P.W.

Board

PS01

8.

Tone

In/Out

Switch

..

mounted

on

P.W.

Board

PTOO

9.

Headphone

........

mounted

on

P.W.

Board

PX00

10.

L.ED.

.

.......-

mounted

on

P.W.

Board

PY00O

4.

VOLTAGE

CONVERSION

@

EUROPEAN

MODEL

ONLY

CAUTION

To

convert

the

unit

to

a

different

power

source

voltage,

DISCONNECT

POWER

SUPPLY

CORD

FROM

AC

change

the

position

as

illustrated

in

the

drawing

below.

OUTLET

BEFORE

CONVERTING

VOLTAGE.

Voltage

Conversion

Chart

VOLTAGE

SELECTOR

Note

on

safety:

Symbo!

A\

Fire

or

electrical

shock

hazard.

Only

orignal

parts

should

be

used

to

replace

any

part

marked

with

symbol

A\

.

Any

other

component

substitution

(other

than

original

type),

may

increase

risk

of

fire

or

electrical

shock

hazard.

:

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AMP

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DIAGRAM

AND

COMPONENT

LOCATIONS

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Schematic

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Marantz SC-8 User manual

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