Marantz 1090 User manual

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TEST

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REQUIRED

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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

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8

10.2

Rear

Panel

Assembly

(PVOO)

Schematic

Diagram

and

Component

Locations

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10.3

Speaker

Switch

Assembly

(PSO1)

Schematic

Diagram

and

Component

Locations

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10

10.4

Pre-Amp.

Assembly

(P400)

Schematic

Diagram

and

Component

Locations

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11

10.5

Main

Amp.

Assembly

(P700)

Schematic

Diagram

and

Component

Locations

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11.

CONNECTION

DIAGRAM

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12.

SCHEMATIC

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17.

TECHNICAL

SPECIFICATIONS

1.

INTRODUCTION

This

service

manual

was

prepared

for

use

by

Authorized

Warranty

Stations

and

contains

service

information

for

the

Marantz

Model

1090

Stereo

Console

Amplifier.

Servicing

information

and

voltage

data

included

in

this

manual

are

intended

for

use

by

knowledgeable

and

expe-

rienced

personnel

only.

All

instructions

shouid

be

read

carefully.

No

attempt

should

be

made

to

proceed

without

a

good

understanding

of

circuitry

operation.

The

parts

list

furnishes

complete

ordering

information.

Most

replacement

parts

should

be

ordered

from

the

Marantz

Company.

However,

a

simple

description

is

included

for

parts

which

can

be

obtained

locally.

2.

PRE-AMPLIFIER

Signals

from

the

input

jacks

(TUNER,

AUX,

TAPE

1

&

TAPE

2)

are

applied

to

the

selector

switch.

Signals

from

the

PHONO

71

and

PHONO

2

jacks

are

applied

to

the

other

section

of

the

selector

switch,

then

to

the

phono-amplifier

and

equalized

for

proper

frequen-

3.

MAIN

AMPLIFIER

The

main

amplifier

consists

of

differential

pre-amplifiers

Q701

and

Q703,

class

‘A’

driver

Q707,

Q709

and

direct-

coupled

drivers

Q717

and

Q719.

Q713

and

O715

act

as

current

limiters.

cy

response.

The

gain

of

the

phono-amplifier

(Q401,

Q403

and

Q405)

is

40dB.

The

outputs

of

the

phono-amplifier

are

fed

to

the

selector

switch.

The

selector

switch

selects

one

of

signals

from

PHONO

1,

PHONO

2,

TUNER,

AUX,

TAPE

1,

TAPE

2

jacks

and

feeds

it

to

the

TAPE

MONITOR

switch

and

TAPE

OUT

jacks.

The

selected

signal

is

then

applied

to

the

MODE

switch,

to

the

balance

and

volume

controls,

and

finally

to

the

pre-amplifier

consisting

of

QEO1,QE03,

QE05

and

QE07.

The

frequency

response

is

controlled

by

the

Bass,

Middle

and

Treble

controls

and

the

resultant

output

is

passed

to

the

PRE

OUT

jacks

through

the

High-cut

filter

net-

works.

These

networks

are

switched

in

and

out

of

the

circuit

by

the

filter

switches.

4.

TROUBLESHOOTING

ANALYSIS

1.

Excessive

line

consumption

a.

Check

for

shorted

0801,

through

0804.

b.

Check

for

shorted

transistor

HOO1,

through

HO04.

c.

Check

for

open

HOO5,

HOO6,

R733,

R734.

2.

No

line

consumption

or

zero

bias

voltage

a.

Check

line

cord,

fuse,

check

for

shorted

H005,

HO06,

R733,

R734.

b.

Check

for

open

rectifiers

Q801,

Q802

or

open

L001.

3.

High

hum

and

noise

level

a.

Check

filter

capacitors

C809,

C810,

C803,

C807.

4.

Parasitic

oscillation

a.

Check

C707, C708,

C709,

C710,

C727,

C728.

5.

POWER

AMPLIFIER

ADJUSTMENT

OF IDLING

CURRENT

Connect

a

vacuum

voltmeter

to

between

emitters

Q721

and

0723.

Adjust

R771

until

12

mA

is

reached,

Likewise,

adjust

Q724,

Q722

and

R722.

6.

TEST

EQUIPMENT

REQUIRED

FOR

SERVICING

Line

Switch

OFF

Variable-line

switch

Variable

Table

1

lists

the

test

equipment

required

for

servicing

the

Wattmeter

Switch

ON

Mode!i

1090

Stereo

Console

Amplifier.

The

wattmeter,

Variable

Autotransformer

0

V

(fully

CCW)

AC

voltmeter,

and

variable

autotransformer

may

be

assem-

Load

8

ohms

(0.5

mfd

—

OFF)

bled

as

a

test

fixture

as

shown

schematically

in

Figure.

Audio

Generator

1kHz

The

load

resistors

and

AC

ammeter

may

be

assembled

into

Output

5

V

range

a

second

test

fixture

as

shown

in

Figure

2.

Gain

Minimum

AC

VTVM

30

V

range

7.

PERFORMANCE

VERIFICATION

2.

Make

sure

that

connections

between

the

resistive

TEST

PROCEDURE

load

and

the

system

terminals

of

the

Model

1090

have

negligible

resistance

when

compared

with

the

A.

TEST

EQUIPMENT

resistance

of

the

load

itself.

Appreciable

resistance

Refer

to

Table1

for

required

test

equipment.

in

wiring

adds

to

the

total

load,

resulting

in

inaccu-

rate

measurements

of

output

power.

B.

PRELIMINARY

PROCEDURES

xe

3.

Connect

amplifier

output

to

load

and

connect

AC

1.

Make

the

test

setup

shown

in

Figure

1

with

the

cord

to

line

power.

Connect

shorting

plugs

to

the

instrument

controls

set

in

the

following

positions:

Phono

input

jacks

of

the

Model

1090.

Table

1.

Test

Equipment

Required

for

Servicing

Item

Manufacturer

and

Model

No.

l

Use

\

ss

S

=

eee

oer

Distortion

Analyzer

Distortion

measurements

Audio

Oscillator

Sound

Technology

Model

1700B

Sinewave

and

squarewave

signal

source

AC

VTVM

voltage

measurements

(AC}

.

Tektronix

Model

T932

Waveform

analysis

and

trouble

shooting

and

Oscilloscope

i

F

Philips

Model

3232

ASO

alignment

Circuit

Tester

a

ad

—-

:

Trouble

shooting

‘

Fluke

Model

8000

“Digital”

Simpson

M

Voltage

measurements

(DC

Oey

Model

313,

Triplet

Model

801

pe

AC

Wattmeter

lr.

Simpson

Model

1379

_

Monitors

primary

power

to

amplifier

{

pee

es

ppeerllen.

ee

.

4

Moni

ifi

ircui

ReReameter

Conmercial

Graded

S10-A)

OGiEOTs

armel:

ier

output

under

short

circuit

condition

=

ae

1

nee

ate

St

Sete

os

ast

a

Moni

;

:

Line

Voltmeter

Simpson

Model

1359

SPuOlS

Potential

OR

PU

Maly

BOWEr

TO

amplifier

ae

|

shan

|

Superior

Electronic

Co.,

.

fat

Variable

Autotransformer

Pee

Model

116B-10A

Adjusts

level

of

primary

power

to

amplifier

l

.

>

Use

phono

plug

with

600

ohm

i

Shorts

amplifier

input

to

eliminate

noise

Shorting

Plug

.

:

across

center

and

shell

pickup

Output

Load

Conaiarsial

Grade

Provides

8-ohm

load

for

amplifier

output

(8

ohms,

+0.5%

100

W)

termination

t

Load

Provides

4-ohm

load

for

amplifier

output

Commercial

Grade

(4

ohms,

0.5%

100

W)

termination

Output

Load

Capacitor

Mytar

Provides

capacitive

load

for

instability

checks

(0.5

mfd)

AC

ve

Goal

Bax

Optional

Item.

Rabricate

in

Monitors

and

controls

primary

power

for

accordance

with

Figure

1

amplifier

upline

Outaue

bakBox

Optional

Item.

Fabricate

in

Provides

various

amplifier

loads

and

can

accordance

with

Figure

2

monitor

shorted

output

105

TO

125VAC

50/60

Hz

l-

LINE

SWITCH

SLO-BLO

VARIAC

VARIABLE

OQ

AC

OUTLETS

AC

WATTMETER

0

TO

150

WATTS

AC

VOLTMETER

0

TO

150VAC

Figure

1.

AC

Power

Control

Box

Simplified

Schematic

,

(MOMENTARY

SWITCH)

O

AC

AMMETER

QO

TO

10

AMPERES

oO

INPUT

OUTPUT

GRD

{GRD

Figure

2.

Amplifier

Output

Load

Box

Simplified

Schematic

TOTAL

HUM

AND

NOISE

TEST

With

shorting

plugs

connected

to

the

Phono

input

jacks

and

an

8

ohm

resistive

load

connected

across

HARMONIC

DISTORTION

TEST

.

Set

the

frequency

of

the

audio

oscillator

and

the

distortion

analyzer

to

20

kHz.

the

speaker

system output

terminals,

connect

a

dis-

2

;

.

Set

the

controls

of

the

analyzer

for

voltage

measure-

tortion

analyzer

across

the

load.

ment

on

the

30

volt

scale.

NOTE:

3.

Adjust

the

audio

oscillator

output

level

until

the

analyzer

meter

indicates

16.8

VAC.

If

the

distortion

analyzer

does

not

contain

a

built-in

volt-

4

meter,

an

AC

VTVM

may

be

substituted.

.

Switch

the

distortion

analyzer

to

Set

Level

and

adjust

SENSITIVITY

for

full

scale

readingon

O~

1%

scale.

Set

the

distortion

analyzer

controls

for

voltage

5

measurements

and

apply

power

to

the

amplifier.

Set

the

volume

contro!

fully

CCW.

Set

the

SELECTOR

switch

to

PHONO.

.

Measure

the

total

harmonic

distortion

with

the

analyzer

and

verify

it

is

less

than

0.1%.

3.

If

the

distortion

analyzer

indicates

more

than

2.0

mV,

NOTE:

refer

to

the

trouble

analysis

section

of

this

manual.

Any

parasitic

oscillation

in

the

amplifier

will

be

displayed

on

the

oscilloscope

when

capacitance

is

switched

into

the

load.

4.

Set

the

volume

control

fully

CW.

If

the

distortion

analyzer

indicates

more

than

20

mV,

refer

to

the

trouble

analysis

section

of

this

manual.

MAXIMUM

POWER

OUTPUT

Connect

the

audio

oscillator

to

the

AUX

input.

Set

.

Switch

the

distortion

analyzer

back

to

SET

LEVEL.

(Do

not

readjust

sensitivity

of

analyzer.)

audio

oscillator

frequency

to

1

kHz.

Set

SELECTOR

7.

Change

the

frequency

of

the

audio

oscillator

and

dis-

switch

to

AUX.

tortion

analyzer

to

1

kHz.

Adjust

audio

oscillator

j

~

Q

With

the

distortion

analyzer

connected

across

the

GURUS

fOr

¢.

ull

<seale

Neading

onthe

O

~cle-scale:

output

load

(8-ohm),

set

the

analyzer

on

the

30

VAC

8.

Measure

the

distortion,

verifying

it'is

no

greater

than

scale.

0.1%.

Turn

the

analyzer

on

and

increase

the

audio

oscillator

9.

Repeat

steps

7

and

8,

changing

frequency

to

20

Hz.

output

to

180

mV.

The

AC

VTVM

should

read

16.8

Distortion

should

be

no

more

than

0.1%,

VAC

:

an

:

i

10.

Check

for

parasitic

oscillation;

there

should

9e

none.

@

EUROPEAN

MODEL

ONLY

8.

VOLTAGE

CONVERSION

This

Model

is

equipped

with

a

universal

power

transform-

er

to

permit

operation

at

110, 120,

220

and

240

V

AC

CAUTION

50/60

Hz.

DISCONNECT

POWER

SUPPLY

CORD FROM

AC

To

convert

the

unit

to

the

required

voltage,

set

the

piug

as

OUTLET BEFORE

CONVERTING

VOLTAGE.

illustrated

so

that

you

can

adjust

the

voltage

as

required.

8.1

Voltage

Conversion

Chart

For

110V

Operation

For

120V

Operation

For

220V

Operation

For

240V

Operation

9.

MAJOR

COMPONENT

LOCATIONS

9.1

Front

Panel

Adjustment

and

Component

Locations

2

i

H

»

by

Mid

LOI

O

wakes

pan

we

Eo.

comule

Hirre

amplifier

“3

4

i

!

a“

°

99

—y—

©

&

G

|

:

{

i

L

i

;

ph.

bi

filter

meine

balance

peakers|

power

ce

ee

=

Ls)

|

<=

L076

S403

SE

28

Ssot

Soot

iui

~

aa

=

ree

a

|

9.3

Rear

Panel

Adjustment

and

Component

Locations

SPEAKER

SYSTEMS:

CRUTION

#1

\eUED

YECTION

AGAINST

FIRE

HAZ

REPLACE

GALY

WITH

SAME

TYPE

SS

AMP

2500

FUSE

——

3005

INGA

iy

Fo

8

ba

eee

how

4O'8G

|

:

a

aeee

Aw

TF

Mine

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A

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ad

wou

‘

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ee

hte

\

x

: :

a

ge

wk

dagen

Powegenict

See

we

wae

foe.”

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ney

gee

we

_

f

a

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

iv

8

1

T

8

RF20

cFr12

e-{

Fe

Marantz 1090 User manual

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