Marantz SM500DC User manual

SERVICE

MANUAL

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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

stereo

are

generally

available

within

72

hours

throughout

the

nation

via

a

toll-free

line

to

our

National

Parts

Depot

in

California.

The

sales

professionals

who

take

your

call

immediately

refer

to

their

own

desk

top

com-

puter

terminal

and

can

quickly

determine

the

availability

and

price

information

you

require.

If

for

some

reason,

your

order

should

exceed

our

available

stock,

we

usually

can

instantly

provide

an

alternate

replacement

part

or

current

delivery

infor-

mation.

When

the

order

is

placed

and

confirmed,

the

computer

simultaneously

generates

“hard

copy”

orders

at

the

distribution

center.

As

hard

copies

come

directly

from

the

computer

to

the

national

parts

depot,

your

requested

stock

is

assembled

and

prepared

for

shipment

and

placed

on

the

first

available

carrier

for

delivery

to

you.

,

ORDERING

PARTS

Phone

orders

will

eliminate

mail

delays,

and

we

encourage

the

use

of

this

method.

If

you

order

by

mail,

use

MARANTZ

parts

order

forms

which

are

available

from

our

National

Parts

Depot

located

at

the

following

address:

SUPERSCOPE

NATIONAL

PARTS

DEPARTMENT

20525

Nordhoff

Street

Chatsworth,

California

91311

Phone:

1-800-423-5108

1-213-998-9333

The

following

information

must

be

supplied

to

eliminate

delays

in

processing

your

order:

.

Complete

address.

.

Complete

part

numbers.

.

Complete

description

of

parts.

.

Model

number

for

which

part

is

required

(indicate

MARANTZ).

.

Account

number

(for

account

customers

only).

OPWN

=

Direct

consumers

will

be

provided

with

the

current

retail

prive

quotation

on

available

parts

in

order

to

advise

them

of

the

cost

of

the

parts

and

shipping.

OVERSEAS

PARTS

ORDERING

Parts

may

also

be

ordered

from

the

following

overseas

addresses:

U.S.A.

CANADA

AUSTRALIA

JAPAN

Marantz

Company,

Inc.

Superscope

Canada,

Ltd.

Marantz

Australia

;

Marantz

Japan,

Inc.

National

Service

Dept.

3710

Nashua

Drive

32

Cross

Street

3622

Kamitsuruma

P.O.

BOx

577

Mississauga

,

Brookvale,

NSW

2100

Sagamihara-shi

Chatsworth,

CA91311

Ontario,

Canada

L4V1M5

Australia

Kanagawa,

Japan

U.S.A.

.

EUROPE

;

Marantz

Europe

S.A.

Marantz

France

Marantz

Audio

U.K.,

Ltd.

Marantz

Germany

GMBH

326

Avenue

Louise

Bte

32.

+4

rue

Bernard

Palissy

193

London

Road

Max-Planck-Strasse

22

1050

Brussels

92600

Asnieres

Staines,

Middlesex

:

6072

Dreieich

Belgium

France United

Kingdom

West

Germany

Marantz

Belgium

Marantz

Svenska

A.B.

Marantz

Norske

A.S.

45

rue

Auguste

Van

Zande

Franzengatan

6

Refstadalleen

13

1080

Brussels

:

10425

Stockholm

Oslo

5

Belgium

Sweden

‘Norway

All

of

the

above

locations

are

fully

equipped

to

take

care

of

your

total

service

needs.

Because

various

countries

have

differing

configuration

requirements,

it is

necessary

that

you

contact

the

service

facility

in

your

particular

country.

In

the

event

that

there

is

no

service

location

listed

for

your

country,

please

contact

the

nearest

facility

for

the

necessary

assistance.

TABLE

OF

CONTENTS

SECTION

PAGE

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4.

TEST

EQUIPMENT

REQUIRED

FORSERVICING

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ALIGNMENT

PROCEDURES

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5.1

Idling

Current

Alignment

Procedure...

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5.2

Power

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Alignment

Procedure...

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6.

DIAGRAM

AND

COMPONENT

LOCATIONS

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3

6.1

Main

Amp

&

Power

Supply

Assembly

(P700)

Schematic

Diagram

and

Component

Locations

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

3

6.2

Speaker

Switch

Assembly

(PS00)

Schematic

Diagram

and

Component

Locations

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

5

6.3

Headphone

Assembly

(PWO00)

Schematic

Diagram

and

Component

Locations

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

ores

5

6.4

Lamp

Assembly

(PZ00)

Schematic

Diagram

and

Component

Locations

.................c0ceeeuuees

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MODEL

SM500

DC

STEREO

POWER

AMPLIFIER

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1.

‘INTRODUCTION

This

service

manual

was

prepared

for

use

by

Authorized

Warranty

Stations

and

contains

service

information

for

the

Marantz

Model

SM500DC

Stereo

Power

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.

3.

BLOCK

DIAGRAM

FEEDBACK

NETWORK

POSITIVE

PREDRIVER

DRIVER

BIAS

CIRCUIT

DIFFERENTIAL

INPUT

NEGATIVE

PREDRIVER

DRIVER

DC

SERVO

AMPLIFIER

PR

AR

REGIE

POSITIVE

LOAD

LINE

LIMITING

PROTECTION

CIRCUIT

NEGATIVE

2.

P.W.

BOARDS

As

can

be

seen

from

the

circuit

diagram,

the

chassis

of

Model

SM500DC

consists

of

the

following

units.

Each

unit

mounted

on

a

printed

circuit

board

is

described

with-

in

the

square

enclosed

by

a

bold

dotted

line

on

the

circuit

diagram.

1.

Main

Amp

&

Power

Supply............-

mounted

on

P.W.

Board

P700

2.

Speaker

Switch.

...

mounted

on

P.W.

Board

PSOO

3.

Head

Phone......

mounted

on

P.W.

Board

PWOO

4,

Lamp..........

mounted

on

P.W.

Board

PZ00

POWER

METER

POSITIVE

CIRCUIT

POWER

SPEAKER

PROTECTION

RELAY

HEAD

TO

RCHO——

||

PHONES

2

NEGATIVE

OWE,

SPEAKERS

SYSTEM

1

TO

RCH

SPEAKER

SYSTEMS

SYSTEM

2

TO

RCH

4.

TEST

EQUIPMENT

REQUIRED

FOR

SERVICING

This

table

lists

the

test

equipment

required

for

servicing

for

the

Model

SM500DC

Stereo

Power

Amplifier.

Item

Manufacturer

and

Model

No.

Distortion

Analyzer

Audio

Oscillator

AC

Voltmeter

Sound

Technology

Model

1700B

Use

Distortion

Measurements

Sinewave

and

squarewave

signal

source

voltage

measurements

(AC)

;

Tektronix

Model

T932

Oscilloscope

oa

Philips

Model

3232

Circuit

Tester

Waveform

analysis

and

trouble

shooting

and

ASO

alignment

Trouble

shooting

DC

Voltmeter

Fluke

Model

8000

“‘Digital’’

Simpson

Model

313,

Triplet

Model

801

Voltage

measurements

(DC)

AC

Wattmeter

Simpson

Modei

1379

Monitors

primary

power

to

amplifier

AC

Ammeter

Commercial!

Grade

(1

~

10

A)

Monitors

amplifier

output

under

short

circuit

condition

Line

Voltmeter

Simpson

Model

1359

Monitors

potential

of

primary

power

to

amplifier

,

Variable

Autotransformer

Superior

Electronic

Co.,

Powerstet

Model

116B-10A

Shorting

Plug

Output

Load

(8

ohms,

+0.5%

100

W)

Output

Load

(4

ohms,

+0.5%

100

W)

Use

phono

plug

with

600

ohm

across

center

and

shell

Commercial

Grade

Commercial

Grade

Adjusts

level

of

primary

power

to

amplifier

Shorts

amplifier

input

to

eliminate

noise

pickup

Provides

8-ohm

load

for

amplifier

output

termination

Provides

4-ohm

load

for

amplifier

output

termination

Output

Load

Capacitor

(0.5

mfd)

Mylar

Provides

capacitive

load

for

instability

checks

AC

Power

Control

Box

Optional

Item.

Fabricate

in

accordance

with

Figure

1

Monitors

and

controls

primary

power

for

amplifier

Amplifier

Output

Load

Box

CL

Optional

Item.

Fabricate

in

accordance

with

Figure

2

Provides

various

amplifier

loads

and

can

monitor

shorted

output

5.

ALIGNMENT

PROCEDURES

5.1

Idling

Current

Alignment

Procedure

Where

to

be

adjusted:

R733

and

R734

Adjusted

value:

20

mV

(20

mA

ea.)

’

Procedure

1

With

the

input

of

the

set

placed

in

Open,

set

the

power

switch

to

ON.

2

Adjust

semi-fixed

resistance,

R733

and.

R734,

so

that

the

voltage

of

both

the

ends

of

R741

and

R742

may

become

20

mV

after

10

seconds.

5.2

Power

Meter

Alignment

Procedure

Where

to

be

adjusted

Lchannelee-<

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dee

eek

RX74

R:

channelnns

sh.

SSNS

ees

tele

eees

RX08

Procedure

1

Connect

the

load

resistance

892

to

the

speaker

ter-

minal

of

the

set.

2

Connect

the

1

KHz

from

SG

to

input.

3

Set

the

power

switch

of

the

set

to

ON,

increase

the

SG

output,

and

adjust

the

speaker

output

to

be-

come

50W

—

822

(20V).

4

Adjust

RX07

and

RX08

so

that

the

meter

may

indi-

cate

50W

(82).

DIAGRAM

AND

COMPONENT

LOCATIONS

6.

6.1

Main

Amp

&

Power

Supply

Assembly

(P700)

Schematic

Diagram

and

Component

Locations.

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Marantz SM500DC User manual

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