Marantz ST 50 U Service Manual

Page 1

TABLE OF CONTENTS

ST-5OU

Stereo tuner

SECTION PAGE
9 SHOCK, FIRE HAZARD SERVICE TEST
1, TECHNICAL SPECIFICATIONS ................................................... I
2, BLOCK DIAGRAM ...................................................... 2
3. SCHEMATIC DIAGRAM AND PARTS LOCATIONS (Pattern side) ............................ 4
4. EXPLODED VIEW AND PARTS LIST ............................................... 15
5. SERVICE PROGRAM .......................................................... 17
6. TUNER ALIGNMENT PROCEDURES ............................................... 18
7. ALIGNMENT POINTS AND TEST POINTS ........................................... 20
8. TUNER MICROPROCESSOR SPECIFICATIONS ........................................ 21
9. ELECTRICAL PARTS LIST ...................................................... 26

model ST-5O

Printed in Japan

First issue : 1991

066J855040 A'O

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MARANTZ DESIGN

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 Agents

ORDERING PARTS:

Parts can be ordered either by mail or by telex. In both

cases, correct part number has to be specified.

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.

001-5de

AND SERVICE

MARANTZ INTERNATIONAL

Vestdijk 9

5600 MD Eindhoven

The Netherlands

Phone: +31/40.758290

Telefax: +31/40.75.82.99

Telex: 35000 PHTC NL routing IND NLMTFAT

MARANTZ USA

1150 FEEHANVILLE DR.

MOUNT PROSPECT, ILLNOIS 60056
U.S.A.

PHONE: 800-554-6633

FAX: 708-299-4005

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 reparied or corrected before AC power is
applied, and verified before return to user/customer.

Ref. UL Standard NO. 1270. Para 74. 3. D (Mandatory
Test after servicing Electrical Appliances, effective
7-1-83).

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