Marantz 74SR50 avr sm

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wwwareeservicemanualanfo 30/7/2014

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TABLE OF CONTENTS

SECTION PAGE
1. BLOCK DIAGRAM ....................................................................... 1
2 SCHEMATIC DIAGRAM AND PARTS LOCATION (Pattern side) .................................. 3
34 EXPLODED VIEW AND PARTS LIST ...................................................... 17
4. TEST EQUIPMENT REQUIRED FOR SERVICING ............................................ 18
5 IDLING CURRENT ADJUSTMENT ........................................................ 19
6. VOLTAGE CONVERSION .............................................................. 19
7 HOW To CHANGE THE SUPPLY VOLTAGE ................................................ 19
s. SERVICE PROGRAM ................................................................... 20
9. TUNER ALIGMENT PROCEDURS ........................................................ 20
10. ALIGMENT AND TEST POINT ........................................................... 23
11. TUNER MICROPROCESSOR SPECIFICATIONS ....... 23
12. ELECTRICAL PARTS LIST .............................................................. 26

maranll®

model SR-50L

Flrst Issue. 1990

4822 725 50917

Digitized in Heiloo, Holland

Page 2

www.freeservicemanuals.info 30/7/2014

MARANTZ DESIGN AND SERVICE

I
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.

I Parts for your MAFIANTZ equipment are generally

MARANTZ INTERNATIONAL
Vestdijk 9

5600 MD Eindhoven

The Netherlands

Phone: +31/40.758290
Telefax: +31/40.75.82.99

l

available to our National Marantz Subsidiary or Agent.

ORDERING PARTS:

Parts can be ordered either by mail or by telex, In both
cases, correct part number has to be specified.
The following inIormation must be supplied to eliminate

delays in processing your order:

. Complete address

. Way of shipment

OKJIJBQN

Telex: 35000 PHTC NL routing IND NLMTFAT

. Complete part numbers and quantities required
. Description of parts
. Model number for which part is required

. Signature: any order form or telex must be signed

othenNise such part order will be considered as null

and void.

PARTS ORDERING

Parts may be ordered at the following addresses:

AUSTRIA

HORNYPHON
Vertriebsgesellschatt GmbH
Wienerbergstrasse 1

A 1101 Wien

Austria

Telex: 132.332

BELGIUM

SVD DIVISION MARANTZ
lndustrialaan 1

1720 Groot~Bijgaarden
Belgium

Telex: 24466

CHILE

MARANTZ

DIVISION OF PHILIPS SA.
AV. Santa Marie. 0760
Casllla 2687

Santiago

Telex: 240.239

DENMARK

MARANTZ

DIVISION OF PHILIPS
SERVICE A/S

Prags Boulevard 80
Postoox 1919
DK»2300 Kebenhavn S
Denmark

Telex: 31201

FINLAND

MARANTZ

DIVISION OF OY PHILIPS Ab
Kaivokatu B

00100 Helsinki

Finland

Telex: 124811

FRANCE

MARANTZ FRANCE
4 Rue Bernard Palissy
92600 Asnieres
France

Telex: 611651

GERMANY

MARANTZ GERMANY GmbH
Alexanderstrasse 1

2000 Hamburg

Germany

THE NETHERLANDS
Elpro Marantz

Wint Hontlaan 28
3526 KV Utrecht
The Netherlands
Telex: 4748

NORWAV

MARANTZ

DIVISION OF PHILIPS A/S
Sandstuveien 40

0680 Oslo 6

Norway

Telex: 72640

GREAT BRITAIN
MARANTZ AUDIO UK. Ltd
Unit 15/16

Saxon Way Industrial Estate
Moor Lane

Harmondsworth UB7 OLw
Great Britain

Telex' 935196

GREECE

SHERTON ELECTRONICS SA.

P.O.Box 21025
Hippocratus Street 188
Athens 11471

Greece

Telex: 216.795

JAPAN

MARANTZ JAPAN. Inc
354. 7-chome, Sagamiono
Sagamihara-shi, Kanagawa
Japan

KUWAIT

AL ALAMIAH ELECTRONICS
Ussama Building

Fahd al Saleem Street
P.O.Box 23781

SatataKuwait

Telex: 22694

ITALV

MARANTZ ITALIANA SPA.
Via Chiese, 74

20126 Milano

ltaly

SAUDI ARABIA

Al. ALAMIAH ELECTRONICS
P.O.Box 5954

Universny Street

Riyadh 11432

Saudi Arabia

Telex: 401530

SOUTH AFRICA
MARANTZ

DIVISION OF PHILIPS SA.
Main Road Martindale
PO. Box. 58088

Newville 21114

South AIrica

SPAIN

PHONO SA

Ignacio Iglssias 10
Badalona (Barcelona)
Spain

Telex: 59355

SWEDEN

MAFIANTZ

DIVISION OF PHILIPS
Forsaljning AB
Tegeiuddsvagen 1
S-115 34 Stockholm
Sweden

Telex; 14060

SWITZERLAND
MAFIANTZ
Technischer Service
Duenstrasse 3
3186 Dudingen
Switzerland

TURKEV
DOGRUOL Ltd.
|.M.C.

6 Blok N°6310
Unkapani
Istanbul
Turkey

Telex: 22085

MALTA

CACHIA & GALEA
Republic Street. GED
Valetta

Telex: 1682

PORTUGAL

MARANTZ

Divisao philips SA. service
OutureIa-carnexlde

2795 LinDA-A-VELHA
Telex: 43906

All of the above locations are fully equipped to take care of your total service needs. Because various countries have
dittering configuration requirements, it is necessary that you contact the service tacility in your particular country. In
the event that there is no service location listed for your country, please, contact the nearest facility tor the necessary

assistance.

M2 2551

In case of difficulties, do not hesitate to contact the Technical
Department at abovementioned address.

Digitized in Heiloo, Holland