Marantz PM 68 78 Service Manual

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TABLE OF CONTENTS
SECTION PAGE
1.8PECIFICATIONS ...................................................................................................................................... 1
2.TEST EQU|PMENT REQUIRED SERVICING ......................................................................................... 2
3.IC INFORMATIONS ................................................................................................................................... 3
4.BLOCK DIAGRAM ...................................................................................................................................... 5
5.WIR|NG DIAGRAM .................................................................................................................................... 7
6.SCHEMATIC DIAGRAM AND PARTS LOCATION (PARTS SIDE) .......................................................... 9
7.EXPLODED VIEW AND PARTS LIST ...................................................................................................... 45
8.IDLING CURRENT AND DC OFFSET VOLTAGE ALIGNMENT .............................................................. 48
9,ELECTRICAL PARTS LIST ...................................................................................................................... 49

Please use this service manual with referring to the user guide (D.F.U )without fail.
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Model PM-68 / PM-78 4822 725 51168

PCS 98 228 First issue 1998.01
214W855010 ACT

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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 equipment are generally available to our National Marantz Subsidiary or Agent.

ORDERING PARTS :

Parts can be ordered either by mail or by Fax.. In both cases, the correct part number has to be specified.

The following information must be supplied to eliminate delays in processing your order :

1. Complete address

2. Complete part numbers and quantities required.

3. Description of parts

4. Model number for which part is required

5. Way of shipment

6. Signature :any order form or Fax. must be signed, otherwise such part order will be considered as null and void.

-USA - CANADA -EuROPE
MARANTz AMERICA, INC. LENBFIOOK INDUSTRIES LIMITED MARANTz EUROPE EN.
440 MEDINAH ROAD 033 GRANITE COURT, ROBOX 00002
ROSELLE, lLLINOIS 50172- 2330 PlCKEFlING, ONTARIO L1W 3K1 BUILDING SFF2
USA CANADA 5500 .10 EINDHOVEN
PHONE :030 - 307 - 3100 PHONE :416-831-6333 THE NETHERLANDS
FAX 1630 . 507 - 2007 FAx :416-831-6936 PHONE :+31 - 40 - 2732241
FAX : +31 - 40 - 2735573
'MDFEJIGNAL USA ' MGFESSIONAL CANADA -TRADING
SUPERSCOPETECHNO Loeies, INC. Tc ELECTRONICS CANADA LTD. MARANTz EUROPE e.v.
MARANTz PROFESSIONAL PRODUCTS 540 FlRING AVE. ROEOX 50002
1000 CORPORATE BLVD., SUITE D BAIE DURFE, QUEBEC Hex 5T2 BUILDING SFF2
AURORA, ILLINOlS 60504 USA CANADA 5600 JB EINDHOVEN
PHONE 2530 - 020 - 4000 PHONE 2 514 - 457 - 4044 THE NETHERLANDS
FAX :530 - 020 - 0103 FAX : 514 < 457 - 5524 PHONE : +31 - no - 2732241
FAX : +31 - 4o - 2735570
- BRAZIL -THAILAND - HONG KONG-------
MARANn BRAZIL MRz STANDARD co., LTD. FORWARD INTERNATIONAL CORRLTD.
Calxa Postal 21462 740 - 750 WANGBURAPA BANGKOK 15 TH FLOOR, REGENT CENTRE,
CEP 04500-970 10200 THAILAND 00 QUEENS ROAD, CENTRAL. H. K,
Sao Paulo, SP. BRAZIL PHONE use 2222 0101 PHONE ; +052 521 - 00133
PHONE :0000 - 123123lDiscegem Direta Granite) FAX : +66 2225 0071 FAX : +552 521 - 7035
FAX :+55 11 534. 0900
- TAIWAN - MALAYSIA

PAI-YUING C0., LTD.

6TH FL NO, 148 SUNG KIANG ROAD,
TAIPEI, 10429,TAIWAN FLOC.
PHONE :+686 (2) 5221304 - 8

FAX : +866 (2) 5630415

W0 KEE HONG ELECTRONICS SDN. BHD.
NO. | 02 JALAN SS 21/35, DAMANSARA
UTAMA, 47400 PETALING JAYA
SELANGOR DARUL EHSAN,

MALAYSIA

PHONE :+60 3 - 7184666

FAX : +60 3 - 7173828

JAPAN Technical
MAFIANTZ JAPAN INC.

25- I , 7- chome, Sagamiono
Sagamihara - shl. Kanagawa

Japan
PHONE : +81 427 44 7950
FAX : +81 427 48 0889

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-SINGAPORE

FORWARD MARKETING (SINGAPORE) PTE. LTD.
29, LENG KEE ROAD

SINGAPORE | 59099,

PHONE : +65 475 - 4555

FAX 2 +65 475 - 8623

SHOCK, FIRE HAZARD SERVICETEST :

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
verified before it is return to the user/customer.

Flef. UL Standard NO.,1492.

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

970928ACT
PCS 98 229