Marantz ST500 Manuale utente

SERVICE

MANUAL

Ay C4

MARANTZ

DESIGN

AND

SERVICE

Using

superior

design

and

selected

high

grade

components,

MARANTZ

Company

has

created

the

ultimate

stereo

sound.

Only

original

MARANTZ

parts

can

insure

that

your

MARANTZ

product

will

continue

perform

the

specifications

for

which

famous.

Parts

for

your

MARANTZ

stereo

are

generally

available

within

hours

throughout

the

nation

via

toll-free

line

our

National

Parts

Depot

California.

The

sales

professionals

who

take

your

call

immediately

refer

their

own

desk

top

com-

puter

terminal

and

can

quickly

determine

the

availability

and

price

information

you

require.

for

some

reason,

your

order

should

exceed

our

available

stock,

usually

can

instantly

provide

alternate

replacement

part

current

delivery

infor-

mation.

When

the

order

placed

and

confirmed,

the

computer

simultaneously

generates

“hard

copy”

orders

the

distribution

center.

hard

copies

come

directly

from

the

computer

the

national

parts

depot,

your

requested

stock

assembled

and

prepared

for

shipment

and

placed

the

first

available

carrier

for

delivery

you.

ORDERING

PARTS

Phone

orders

will

eliminate

mail

delays,

and

encourage

the

use

this

method.

you

order

mail,

use

MARANTZ

parts

order

forms

which

are

available

from

our

National

Parts

Depot

located

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

supplied

eliminate

delays

processing

your

order:

Complete

address.

Complete

part

numbers.

Complete

description

parts.

Model

number

for

which

part

required

(indicate

MARANTZ).

Account

number

(for

account

customers

only).

OhWN

Direct

consumers

will

provided

with

the

current

retail

prive

quotation

available

parts

order

advise

them

the

cost

the

parts

and

shipping.

OVERSEAS

PARTS

ORDERING

Parts

may

also

ordered

from

the

following

overseas

addresses:

CANADA

AUSTRALIA

JAPAN

Marantz

Europe,

S.A.

Superscope

(Australasia)

Pty.,

Ltd.

Marantz

GmbH

3710

Nashua

Drive

Cross

Street

(P.O.

Box

604)

3622

Kamitsuruma

Mississauga

Brookvale

2100

N.S.W.

Sagamihara

Shi

Ontario,

Canada

L4V1M5

Australia

Kanagawa,

Japan

EUROPE

Superscope

Europe,

S.A.

Marantz

France

Marantz

Audio

U.K.

Ltd.

Superscope

GmbH

Avenue

Leopold

Il,

Rue

Louis

Armand

London

Road,

203

Max-Planck-Strasse

7120

Peronnes-Lez-Binche

92600

Asnieres

Staines

D-6072

Dreieich

Belgium

Hauts-de-Seine

Middlesex

West

Germany

France

England

All

the

above

locations

are

fully

equipped

take

care

your

total

service

needs.

Because

various

countries

have

differing

configuration

requirements,

necessary

that

you

contact

the

service

facility

your

particular

country.

the

event

that

there

service

location

listed

for

your

country,

please

contact

the

nearest

facility

for

the

necessary

assistance.

BRnem

Been

watz.

sound

better

TABLE

CONTENTS

SECTION

PAGE

ANT

DUC

ies

oie

See

aac

aan

ard

PW.

BOARDS

scsi

cise

hae

SRW

See

Seah

ols

woe

Wack

TEST

EQUIPMENT

REQUIRED

FOR

SERVICING

...

1...

ccc

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eens

TUNER

ALIGNMENT

PROCEDURES.....

1.2...

cece

cere

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ete

2~5

VOLTAGE

CONVERSION...

0...

ccc

eee

ene

eee

neta

FREQUENCY

SYNTHESIZER

RADIO

TUNING

SYSTEM

.....

0...

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eens

7~17

DIAGRAM

AND

COMPONENT

LOCATIONS

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

ccc

cee

cece

nee

eeeeeeeeenas

FUNCTIONAL

BLOCK

DIAGRAM

.....

1...

eee

nee

eeees

EXPLODED

VIEW

AND

PARTS

LIST...

1.2...

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ELECTRICAL

PARTS

LIST

sce

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PREG

VERE omer

11.

TECHNICAL

SPECIFICATIONS.

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39,

12.

SCHEMATIC

DIAGRAM

MODEL

ST500

AM/FM

STEREOPHONIC

TUNER

SFOS

G00

INTRODUCTION

This

service

manual

was

prepared

for

use

Authorized

Warranty

Stations

and

contains

service

information

for

Marantz

Model

ST500

AM/FM

Stereophonic

Tuner.

Servicing

information

and

voltage

data

included

this

manual

are

intended

for

use

the

knowledgeable

and

experienced

technician

only.

All

instructions

should

read

carefully.

attempt

should

made

proceed

without

good

understanding

the

operations

the

tuner.

The

parts

list

furnishes

information

which

replacement

parts

may

ordered

from

the

Marantz

Company.

simple

description

included

for

parts

which

can

usually

obtained

through

local

suppliers.

NOTE

SAFETY:

computer

Sim

tuner:

selector

Tartine

SCaee

power

P.W.

BOARDS

can

seen

from

the

circuit

diagram,

the

chassis

Model

ST500

consists

the

following

units.

Each

unit

mounted

printed

circuit

board

described

within

the

square

enclosed

bold

dotted

line

the

circuit

dia-

gram.

Tuner

Synthesizer

. .

mounted

P.W.

Board

P100

2..Noise

Amplifier.......

mounted

P.W.

Board

PBOO

Display

Ass’y........

mounted

P.W.

Beard

P900

DE-Emphasis

Switch

...

mounted

P.W.

Board

PCOO

Scan

Step...........

mounted

P.W.

Board

PC50

FUSC:)

bcc

eee

mounted

P.W.

Beard

PPOO

Function

Switch......

mounted

P.W.

Beard

PSOO

Mode

Switch

........

mounted

P.W.

Board

PT00

Preset

Switch........

mounted

P.W.

Board

PU0O

THE

PARTS

MARKED

WITH

ARE

IMPORTANT

PARTS

THE

SAFETY.

PLEASE

USE

THE

PARTS

HAVING

THE

DESIGNATED

PARTS

NUMBERS

WITHOUT

FAIL.

FTZ

REGULATION

Instruction

for

the

use

the

range

other

than

specified

FTZ

codes.

Achtung

fiir

die

Leute,

die

dem

Gebiet

wohnen,

die

FTZ-Bestimmungen

vorherrschend

sind.

Sollte

des

Geradt

auch

fiir

Frequenzen

auszerhab

des

den

FTZ-Bestimmungen

angegebenen

Bereiches

«mpfange-

bereit

sein,

bitten

wir,

den

Bereich

durch

Nachzellen

des

Kernes

der

Oszillatorspule

(in

der

Abbildung

nit

“FTZ”

gekennzeichnet)

korrigieren,

dass

den

Betimmun-

gen

entspricht.

TEST

EQUIPMENT

REQUIRED

FOR

SERVICING

This

table

lists

the

test

equipment

required

for

servicing

the

Model

ST500

Tuner.

Use

Signal

source

for

alignment

[Trem

|___

Manufacturer

and

Model

No,

Signal

Generator

Test

Loop

Use

with

Signal

Generator

Signal

Generator

Signal

source

for

alignment

ane

tand

MPX

Signal

Generator

Sound

Technology

Mode!

1000A

ereo

separation

alignment

and

trouble

shooting

Distortion

Analyzer

Distortion

measurements

Audio

Oscillator

‘|

Sound

Technology

Model

1700A

Sinewave

and

squarewave

signal

source

VTVM

Voltage

measurements

(AC)

Tektronix

Model

T93

;

Oscilloscope

isaac

pede

Waveform

analysis

and

trouble

shooting

Philips

Model

3232

MPX

Oscillator

adjustment

(VCO)

Trouble

shooting

Frequency

Counter

Circuit

Tester

Fluke

Model

8000

“‘Digital’’

Simpson

Model

313,

Triplet

Model

801

Wattmeter

Simpson

Model

1379

Monitors

primary

power

tuner

Line

Voltmeter

Simpson

Model

1359

Monitors

potential

primary

power

tuner

Superior

Electronic

Co.,

‘ :

Variable

Autotransformer

Powerstat

Model

116B-10A

Adjusts

level

primary

power

tuner

VTVM

Voltage

measurements

(DC)

TUNER

ALIGNMENT

PROCEDURES

dummy

resistor

kohms

must

connected

across

the

tuner

output

terminals

before

alignment.

4.1

Alignment

Procedures

(Selector

switch

the

“FM”

position,

mode/tuning

switch

the

Mono/Manual

Position.)

Local

Oscillator

Alignment

Indicator

Connection

Signal

Frequency

Set

the

Digital.

Readout

Frequency

Signal

Source

Connection

Repeat

steps

and

107.90

MHz

C117

for

201V

voltmeter

30V

and

range

J505

88.10

MHz

L106

for

3.0)

;

Alignment

Signal

Source

Connection

Signal

tndicator

Set the

Digital

Frequency

Connection

Readout

Frequency

generator

antenna

terminal

through

matching

network

(300

ohms,

balanced)

Maintain

level

below

limit.

C101,

C107,

C110

for

106.10

MHz

106.10

MHz

maximum

output

and

VTVM

Lor

minimum

distortion.

channel

output

(3102)

L101,

L102,

L103

for

90.10

MHz

90.10

MHz

maximum

output

and

minimum

distortion.

Repeat

steps

and

generator

antenna

terminals

through

matching

network

(300

ohms,

balanced)

Maintain

fevel

below

limit.

generator

1mV

output

antenna

terminals

through

matching

network.

(300

ohm,

balanced)

generator

1mV

output

antenna

terminals

through

matching

network.

(300

ohms,

balanced)

generator

1mV

output

antenna

terminals

through

matching

network.

(300

ohms,

balanced)

VTVM

LorR

98.10

MHz

channel

output

98.10

MHz

(J102)

L105

for

maximum

output

and

minimum

distortion.

“0”

center

meter

current

98.10

MHz

meter

100uA

98.10

MHz

range

between

J201

and

J202

L202

primary

core

that

the

meter

indicates

its

center

may

read

“Q",

Band

switch

"“Wide’’.

202

secondary

core

for

minimum

distortion.

Band

switch

“Narrow”.

L201

core

for

minimum

distortion.

Distortion

meter

channel

98.10

MHz

output

(J102)

98.10

MHz

RTO1

that

signal

strength

Led

may

light

points.

98.10

MHz

98.10

MHz

generator

antenna

terminals

through

matching

network

(300

ohms,

balanced)

with

the

signal

level

that

the

sigral

strength

LED

may

light

points

.at

band

switch

“Wide"’.

Band

switch

“Narrow”.

R215

that

signal

strength

Led

may

light

points.

98.10

MHz

98.10

MHz

4.2

Muting

Circuit

Alignment

(FM

stopping

level

scanning.

stereo

indicator

threshold

level.)

Signal

Source

Connection

Signal

Frequency

Indicator

Connection

Set

the

Digital

Readout

Frequency

Adjust:

generator

12.5uV

output

antenna

terminal

through

matching

network

(300

ohm,

balanced)

98.10

MHz

4.3

Multiplex

Alignment

Procedures

(Selector

switch

the

“FM”

position.

Mode/Tuning

switch

the

Stereo/Auto

position.)

Signal

Source

Connection

Signal

Frequency

VTVM

RorLl

channel

output

(J102)

98.10

MHz

Set

the

Digital

Readout

Frequency

indicator

Connection

R229

for

12.5uV

threshold

level

(setting

Auto

position

“Mode”

switch)

Adjust:

generator

antenna

terminals

through

matching

network

(300

ohms,

balanced)

with

1mV

stereo

simulator

level

and

100%

modulation

(Pilot

9%)

generator

antenna

terminals

through

matching

network

(300

ohms,

balanced)

with

1mV

stereo

simulator

level

and

Pilot

modulation.

4.4

Alignment

Procedures

modulation

Stereo

left

(1,000

Hz)

Stereo

right

(1,000

Hz)

Pilot

only

Frequency

counter

(J301)

VTVM

right

channel

output

(J102)

98.10

MHz

VTVM

left

channel

output

terminal

(J102)

Repeat

steps

and

VTVM

right

and

left

channel

output

(J102)

(Selector

switch

the

“AM”

position.

Mode/Tuning

switch

the

Mono/Manual!

position.)

Local

Oscillator

Alignment

(Scan

step

selector

switch

(SC51)

the

“10

kHz”

position.)

Signal

Source

Connection

Signal

Frequency

Set

the

Digital

Readout

Frequency

Indicator

Connection

voltmeter

1,610

kHz

30V

and

range

(J505)

530

kHz

Repeat

steps

and

R303

that

Frequency

may

precisely

read

kHz

Band

switch

’’Wide”

RSO5.

Band

switch

‘‘Narrow”

RS04.

For

same

separation

‘both

channels,

R306

that

minimum

output

should

the

sarne

both

channels.

CA10

for

23V

LAO2

for

2.0V

Alignment

Signal

Source

Connection

Signal

Frequency

Indicator

Connection

Set

the

Digital

Readout

Frequency

Adjust:

Sweep

generator

(RAOS)

AMRF

Alignment

Stopping

Level

Scanning

(Mode/Tuning

switch

the

“Stereo/Auto”

Position.)

Signal

Source

Connection

450

kHz

marker

Signal

Frequency

Oscilloscope

(JAO5)

Indicator

Connection

Quiet

point

band

Set

the

Digital

—

Readout

Frequency

LAO3

LAO4

for

maximum

and

symmetric

response

Adjust:

Apply

the

signal

the

bar

antenna

from

the

generator

using

the

test

loop.

per

the

Figure

1,400

kHz

600

kHz

VTVM

Lor

channel

output

(J102)

1,400

kHz

600

kHz

CAO2

for

maximum

output

L051

for

maximum

output

Apply

the

signal

the

bar

antenna

from

the

generator

using

the

test

loop.

per

the

Figure

(with

3mV/m)

Signal

Source

Connection

Repeat

steps

and

necessary

obtain

maximum

sensitivity.

1,000

kHz

Signal

Frequency

Indicator

Connection

1,000

kHz

Set

the

Digital

Readout

Frequency

RSO6

that

signal

strength

LED

may

light

points.

Apply

the

signal

the

bar

antenna

from

the

generator

using

the

test

loop.

per

the

Figure

(with

600uV/m)

1,000

kHz

VTVM

channel

output

(J102)

Test

Loop

60cm

1,000

kHz

Bar

Antenna

Figure

Application

Signal

RA18

for

600;V

threshold

level

VOLTAGE

CONVERSION

EUROPEAN

MODEL

ONLY

convert

the

unit

different

power

source

voltage,

change

the

position

illustrated

the

drawing

below.

CAUTION:

DISCONNECT

POWER

SUPPLY

CORD

FROM

OUTLET

BEFORE

CONVERTING

VOLTAGE.

NOT

DISASSEMBLE

THE

VOLTAGE

SELECTOR

ABSOLUTELY.

(T)

(A)

Versions

(N)

Version

—

(P)

Version

Figure

Voltage

Conversion

Chart

FREQUENCY

SYNTHESIZER

RADIO

TUNING

SYSTEM

[1]

Construction

Synthesizer

System

This

frequency

synthesizer

composed

microcomputer

(MN1400SJ),

PLL

LS!

(MN6142),

CMOS

RAM

(MN1203),

prescaler

(uPB551C),

low

pass

filter,

crystals

and

fluorescent

indicating

tubes,

shown

Figure

PLL

6142

PRESCALER

yPBSSIC

MICROCOMPUTER

14008J

CMOS

RAM

1203

INDICATOR

KEY

BOARD

Figure

[2]

Microcomputer

MN1400SJ

[2]-1.

Terminal

Connections

[2]-2.

Block

Diagram

TOP

VIEW

INSTRUCTION

PLA

rE)

STACK

LEVEL

eof

1400

Figure

COINCIDENCE

DETECTOR

GATE

LATCH

SYNCHRONIZING

CIRCUIT

Figure

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