Marantz 1090 Manuale utente

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TABLE

CONTENTS

SECTION

PAGE

INFRODUCTION)

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PRE-AMPLIBUER:

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MAIN

(AMPLIFIER:

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TROUBLESHOOTING

ANALYSIS

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POWER

AMPLIFIER

ADJUSTMENT

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TEST

EQUIPMENT

REQUIRED

FOR

SERVICING

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PERFORMANCE

VERIFICATION

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VOLTAGE.

CONVERSION

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MAJOR

COMPONENT

LOCATIONS

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9.1

Front

Panel

Adjustment

and

Component

Locations

.....

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9.2

Main

Chassis

Component

Locations

(Top

View)

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9.3

Rear

Panel

Adjustment

and

Component

Locations

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9.4

Main

Chassis

Component

Locations

(Bottom

View)

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10.

DIAGRAM

AND

COMPONENT

LOCATIONS

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10.1.

Tone

Component

Assembly

(PFO1)

Schematic

Diagram

and

Component

Locations

.........0.ee

eee

10.2

Rear

Panel

Assembly

(PVOO)

Schematic

Diagram

and

Component

Locations

.........0.0ce

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eaae

10.3

Speaker

Switch

Assembly

(PSO1)

Schematic

Diagram

and

Component

Locations

.......eee

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eeeees

10.4

Pre-Amp.

Assembly

(P400)

Schematic

Diagram

and

Component

Locations

........

cece

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10.5

Main

Amp.

Assembly

(P700)

Schematic

Diagram

and

Component

Locations

.........0cececeeuecees

11.

CONNECTION

DIAGRAM

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12.

SCHEMATIC

DIAGRAM

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13.

EXPLODED

MECHANICAL

DIAGRAM

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14.

PACKING

MATERIAL EXPLODED

VIEW

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DIAGRAM.

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163

PARTS:

LIST)

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Beste

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Recede

damier

binds

Ber

17.

TECHNICAL

SPECIFICATIONS

INTRODUCTION

This

service

manual

was

prepared

for

use

Authorized

Warranty

Stations

and

contains

service

information

for

the

Marantz

Model

1090

Stereo

Console

Amplifier.

Servicing

information

and

voltage

data

included

this

manual

are

intended

for

use

knowledgeable

and

expe-

rienced

personnel

only.

All

instructions

shouid

read

carefully.

attempt

should

made

proceed

without

good

understanding

circuitry

operation.

The

parts

list

furnishes

complete

ordering

information.

Most

replacement

parts

should

ordered

from

the

Marantz

Company.

However,

simple

description

included

for

parts

which

can

obtained

locally.

PRE-AMPLIFIER

Signals

from

the

input

jacks

(TUNER,

AUX,

TAPE

are

applied

the

selector

switch.

Signals

from

the

PHONO

and

PHONO

jacks

are

applied

the

other

section

the

selector

switch,

then

the

phono-amplifier

and

equalized

for

proper

frequen-

MAIN

AMPLIFIER

The

main

amplifier

consists

differential

pre-amplifiers

Q701

and

Q703,

class

‘A’

driver

Q707,

Q709

and

direct-

coupled

drivers

Q717

and

Q719.

Q713

and

O715

act

current

limiters.

response.

The

gain

the

phono-amplifier

(Q401,

Q403

and

Q405)

40dB.

The

outputs

the

phono-amplifier

are

fed

the

selector

switch.

The

selector

switch

selects

one

signals

from

PHONO

TUNER,

AUX,

TAPE

jacks

and

feeds

the

TAPE

MONITOR

switch

and

TAPE

OUT

jacks.

The

selected

signal

then

applied

the

MODE

switch,

the

balance

and

volume

controls,

and

finally

the

pre-amplifier

consisting

QEO1,QE03,

QE05

and

QE07.

The

frequency

response

controlled

the

Bass,

Middle

and

Treble

controls

and

the

resultant

output

passed

the

PRE

OUT

jacks

through

the

High-cut

filter

net-

works.

These

networks

are

switched

and

out

the

circuit

the

filter

switches.

TROUBLESHOOTING

ANALYSIS

Excessive

line

consumption

Check

for

shorted

0801,

through

0804.

Check

for

shorted

transistor

HOO1,

through

HO04.

Check

for

open

HOO5,

HOO6,

R733,

R734.

line

consumption

zero

bias

voltage

Check

line

cord,

fuse,

check

for

shorted

H005,

HO06,

R733,

R734.

Check

for

open

rectifiers

Q801,

Q802

open

L001.

High

hum

and

noise

level

Check

filter

capacitors

C809,

C810,

C803,

C807.

Parasitic

oscillation

Check

C707, C708,

C709,

C710,

C727,

C728.

POWER

AMPLIFIER

ADJUSTMENT

OF IDLING

CURRENT

Connect

vacuum

voltmeter

between

emitters

Q721

and

0723.

Adjust

R771

until

reached,

Likewise,

adjust

Q724,

Q722

and

R722.

TEST

EQUIPMENT

REQUIRED

FOR

SERVICING

Line

Switch

OFF

Variable-line

switch

Variable

Table

lists

the

test

equipment

required

for

servicing

the

Wattmeter

Switch

Mode!i

1090

Stereo

Console

Amplifier.

The

wattmeter,

Variable

Autotransformer

(fully

CCW)

voltmeter,

and

variable

autotransformer

may

assem-

Load

ohms

(0.5

mfd

—

OFF)

bled

test

fixture

shown

schematically

Figure.

Audio

Generator

1kHz

The

load

resistors

and

ammeter

may

assembled

into

Output

range

second

test

fixture

shown

Figure

Gain

Minimum

VTVM

range

PERFORMANCE

VERIFICATION

Make

sure

that

connections

between

the

resistive

TEST

PROCEDURE

load

and

the

system

terminals

the

Model

1090

have

negligible

resistance

when

compared

with

the

TEST

EQUIPMENT

resistance

the

load

itself.

Appreciable

resistance

Refer

Table1

for

required

test

equipment.

wiring

adds

the

total

load,

resulting

inaccu-

rate

measurements

output

power.

PRELIMINARY

PROCEDURES

Connect

amplifier

output

load

and

connect

Make

the

test

setup

shown

Figure

with

the

cord

line

power.

Connect

shorting

plugs

the

instrument

controls

set

the

following

positions:

Phono

input

jacks

the

Model

1090.

Table

Test

Equipment

Required

for

Servicing

Item

Manufacturer

and

Model

No.

Use

eee

oer

Distortion

Analyzer

Distortion

measurements

Audio

Oscillator

Sound

Technology

Model

1700B

Sinewave

and

squarewave

signal

source

VTVM

voltage

measurements

(AC}

Tektronix

Model

T932

Waveform

analysis

and

trouble

shooting

and

Oscilloscope

Philips

Model

3232

ASO

alignment

Circuit

Tester

—-

Trouble

shooting

‘

Fluke

Model

8000

“Digital”

Simpson

Voltage

measurements

(DC

Oey

Model

313,

Triplet

Model

801

Wattmeter

lr.

Simpson

Model

1379

Monitors

primary

power

amplifier

{

pee

ppeerllen.

Moni

ifi

ircui

ReReameter

Conmercial

Graded

S10-A)

OGiEOTs

armel:

ier

output

under

short

circuit

condition

nee

ate

Sete

ast

Moni

;

Line

Voltmeter

Simpson

Model

1359

SPuOlS

Potential

Maly

BOWEr

amplifier

shan

Superior

Electronic

Co.,

fat

Variable

Autotransformer

Pee

Model

116B-10A

Adjusts

level

primary

power

amplifier

Use

phono

plug

with

600

ohm

Shorts

amplifier

input

eliminate

noise

Shorting

Plug

across

center

and

shell

pickup

Output

Load

Conaiarsial

Grade

Provides

8-ohm

load

for

amplifier

output

ohms,

+0.5%

100

termination

Load

Provides

4-ohm

load

for

amplifier

output

Commercial

Grade

ohms,

0.5%

100

termination

Output

Load

Capacitor

Mytar

Provides

capacitive

load

for

instability

checks

(0.5

mfd)

Goal

Bax

Optional

Item.

Rabricate

Monitors

and

controls

primary

power

for

accordance

with

Figure

amplifier

upline

Outaue

bakBox

Optional

Item.

Fabricate

Provides

various

amplifier

loads

and

can

accordance

with

Figure

monitor

shorted

output

105

125VAC

50/60

LINE

SWITCH

SLO-BLO

VARIAC

VARIABLE

OUTLETS

WATTMETER

150

WATTS

VOLTMETER

150VAC

Figure

Power

Control

Box

Simplified

Schematic

(MOMENTARY

SWITCH)

AMMETER

AMPERES

INPUT

OUTPUT

GRD

{GRD

Figure

Amplifier

Output

Load

Box

Simplified

Schematic

TOTAL

HUM

AND

NOISE

TEST

With

shorting

plugs

connected

the

Phono

input

jacks

and

ohm

resistive

load

connected

across

HARMONIC

DISTORTION

TEST

Set

the

frequency

the

audio

oscillator

and

the

distortion

analyzer

kHz.

the

speaker

system output

terminals,

connect

dis-

;

Set

the

controls

the

analyzer

for

voltage

measure-

tortion

analyzer

across

the

load.

ment

the

volt

scale.

NOTE:

Adjust

the

audio

oscillator

output

level

until

the

analyzer

meter

indicates

16.8

VAC.

the

distortion

analyzer

does

not

contain

built-in

volt-

meter,

VTVM

may

substituted.

Switch

the

distortion

analyzer

Set

Level

and

adjust

SENSITIVITY

for

full

scale

readingon

scale.

Set

the

distortion

analyzer

controls

for

voltage

measurements

and

apply

power

the

amplifier.

Set

the

volume

contro!

fully

CCW.

Set

the

SELECTOR

switch

PHONO.

Measure

the

total

harmonic

distortion

with

the

analyzer

and

verify

less

than

0.1%.

the

distortion

analyzer

indicates

than

2.0

mV,

NOTE:

refer

the

trouble

analysis

section

this

manual.

Any

parasitic

oscillation

the

amplifier

will

displayed

the

oscilloscope

when

capacitance

switched

into

the

load.

Set

the

volume

control

fully

CW.

the

distortion

analyzer

indicates

than

mV,

refer

the

trouble

analysis

section

this

manual.

MAXIMUM

POWER

OUTPUT

Connect

the

audio

oscillator

the

AUX

input.

Set

Switch

the

distortion

analyzer

back

SET

LEVEL.

(Do

not

readjust

sensitivity

analyzer.)

audio

oscillator

frequency

kHz.

Set

SELECTOR

Change

the

frequency

the

audio

oscillator

and

dis-

switch

AUX.

tortion

analyzer

kHz.

Adjust

audio

oscillator

With

the

distortion

analyzer

connected

across

the

GURUS

fOr

¢.

ull

<seale

Neading

onthe

~cle-scale:

output

load

(8-ohm),

set

the

analyzer

the

VAC

Measure

the

distortion,

verifying

it'is

greater

than

scale.

0.1%.

Turn

the

analyzer

and

increase

the

audio

oscillator

Repeat

steps

and

changing

frequency

Hz.

output

180

mV.

The

VTVM

should

read

16.8

Distortion

should

than

0.1%,

VAC

10.

Check

for

parasitic

oscillation;

there

should

none.

EUROPEAN

MODEL

ONLY

VOLTAGE

CONVERSION

This

Model

equipped

with

universal

power

transform-

permit

operation

110, 120,

220

and

240

CAUTION

50/60

Hz.

DISCONNECT

POWER

SUPPLY

CORD FROM

convert

the

unit

the

required

voltage,

set

the

piug

OUTLET BEFORE

CONVERTING

VOLTAGE.

illustrated

that

you

can

adjust

the

voltage

required.

8.1

Voltage

Conversion

Chart

For

110V

Operation

For

120V

Operation

For

220V

Operation

For

240V

Operation

MAJOR

COMPONENT

LOCATIONS

9.1

Front

Panel

Adjustment

and

Component

Locations

Mid

LOI

wakes

pan

Eo.

comule

Hirre

amplifier

“3

a“

—y—

{

;

ph.

filter

meine

balance

peakers|

power

Ls)

L076

S403

Ssot

Soot

iui

ree

9.3

Rear

Panel

Adjustment

and

Component

Locations

SPEAKER

SYSTEMS:

CRUTION

\eUED

YECTION

AGAINST

FIRE

HAZ

REPLACE

GALY

WITH

SAME

TYPE

AMP

2500

FUSE

——

3005

INGA

eee

how

4O'8G

aeee

Mine

”

wou

‘

AAC

hte

: :

dagen

Powegenict

See

wae

foe.”

ney

gee

thes

10.

DIAGRAM

AND

COMPONENT

LOCATIONS

10.1

Tone

Component

Assembly

(PF01)

Schematic

Diagram

and

Component

Locations

RFO2

22k

100k

RFO4

22k

CFO!

CFOS

0.015

9.015

50V

RF20

cFr12

e-{

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