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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

telex.

In

both

cases,

MARANTZ

part

number

has

to

be

specified.

If

you

order

by

mail,

fulfil

MARANTZ

order

forms.

MARANTZ

S.A.

SUPERSCOPE

NATIONAL

PARTS

DEPARTMENT

EUROPEAN

PARTS

DEPARTMENT

20525

Nordhoff

Street

2,

Avenue

Léopold

III

Chatsworth,

California

91311

B-7120

PERONNES-lez-BINCHE

Phone:

1-800-423-5108

BELGIUM

Phone:

1-213-998-9333

TWX:

57589

SEPLT

B

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.

OX

OV

oS

PARTS

ORDERING:

Parts

may

be

ordered

from

the

following

addresses:

EUROPE

MARANTZ

S.A.

MARANTZ

DENMARK

MARANTZ

BELGIUM

MARANTZ

NEDERLAND

8.V,

MARANTZ

AUSTRIA

Ge.M.8.H.

European

Parts

Department

Bregnergdvej

132b

45

Rue

Auguste

Van

Zande

Wagenmakersweg

3

25

Franz

Lisztgasse

2,

Avenue

Léopold

III

3460

Birkergd

1080

Brussels

3449

HV

Woerden

2380

Perchtoldsdorf

B-7120

Péronnes-lez-Binche

Denmark

Belgium

Netherlands

Austria

Belgium

Telex:

39137

Telex:

113583

Telex:

57589

MARANTZ

S.A.

MARANTZ

FRANCE

MARANTZ

SVENSKA

A.B.

MARANTZITALIANA

S.p.A.

MARANTZ

GERMANY

G.M.B.H.

326

Avenue

Louise

Bte32

4

Rue

Bernard

Palissy

Svartviksvagen

56

Via

Monte

Napoleone,

10

Max-Pianckstrasse

22

1050

Bruxelles

92600

Asniéres

Traneberg

Bromma

20121

Milano

6072

Dreieich

1

Belgium

France

Sweden

Italia

Germany

Telex:

26602

Telex:

611651

Telex:

13449

Telex:

4185316

MARANTZ

AUDIO

U.K.

LTD.

Unit

15/16

Saxon

Way

Industrial

Estate

AUSTRALIA

U.S.A.

JAPAN

Moor

Lane

MARANTZ

AUSTRALIA

PTY.,,

LTD.

MARANTZ

COMPANY,

INC.

MARANTZ

JAPAN,

INC.

Harmondsworth

UB7

OLW

19

Chard

Road

Nationai

Service

Dept

35-1,

7-chome,

Sagamiono

Great

Britain

Brookvale,

NSW

2100

P.O.

Box

577

Sagamihara-shi,

Kanagawa

Telex:

935196

Australia

Chatsworth,

CA

91311

Japan

Telex:

24121

US.A

Telex:

22878

Telex:

4720284

All

of

the

above

locations

are

fully

equipped

to

take

care

of

your

total

service

needs.

Because

various

countries

have

differing

configuration

requirements,

it is

necessary

that

you

contact

the

service

facility

in

your

particular

country.

In

the

event

that

there

is

no

service

location

listed

for

your

country,

please,

contact

the

nearest

facility

for

the

necessary

assistance.

In

case

of

difficulties,

do

not

hesitate

to

contact

the

Technical

Department

at

abovementioned

address.

NOTE-—FOR

U.S.A.

ONLY

Parts

for

your

MARANTZ

stereo

are

generally

available

within

72

hours

throughout

the

nation

via

a

toll-free

line

to

our

National

Parts

Depot

in

California.

The

sales

professionals

who

take

your

call

immediately

refer

to

their

own

desk

top

computer

terminal

and

can

quickly

determine

the

availability

and

price

information

you

require.

If,

for

some

reason,

your

order

should

exceed

our

available

stock,

we

usually

can

instantly

provide

an

alternate

replacement

part

or

current

delivery

information.

When

the

order

is

placed

and

confirmed,

the

computer

simultaneously

generates

“hard

copy”

orders

at

the

distribution

center.

As

hard

copies

come

directly

from

the

computer

to

the

national

parts

depot,

your

requested

stock

is

assembled

and

prepared

for

shipment

and

placed

on

the

first

available

carrier

for

delivery

to

you.

Phone

orders

will

eliminate

mail

delays,

and

we

encourage

the

use

of

this

method.

If

you

order

by

mail,

use

MARANTZ

Parts

order

forms

which

are

available

from

SUPERSCOPE

NATIONAL

PARTS

DEPARTMENT.

ERR

eR

Bek

BRE

ZZ’

“—s~

TABLE

OF

CONTENTS

SECTION

PAGE

INTRODUCTION.

sessed

see

we

to

oak

ese

Ne

SS

ee

ee

ee

Wa

hae

eae

1

1.

SHOCK,

FIRE

HAZARD

SERVICE

TEST:

.....

2.

ee

eee

1

2:

(PWBOARDS

2.6603

seeded

See

ES

ee

ee

ee

Se

die

ees

ee

eh

rae

ts

eee

1

3.

TEST

EQUIPMENT

REQUIRED

FOR

SERVICING

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

00.0

e

eee

eee

eee

1

4:.

(DESCRIPTIONS

15

cod

Sc

iciinc

8G

Oe

phelah

ec

Maraita

hoard

WA

aca

ere

a

Ee

Ee

eee

gee

eS

2

4.1

FORWARD/REVERSE

Mechanism

Switching

..........

20

0c

eee

ee

ee

eee

eee

eee

ee

eee

2

4.2

Playback

Equalizer

Amplifier

2...

0.00.

ccc

ee

ee

ee

eee

eee

eee

3

4.3

Dual

Pre-Amp

for

Auto

Reversw

TA7405P

(QJ25)

2.0...

ee

eee

eee

3

4.4

Operation

of

Playback

Equalizer

..

2.2.

2...

oe

ee

eee

ee

nee

4

4.5

Equalizer

Switching

.....

20.0.0...

ee

ee

eee

eee

ee

ee

eee

eee

eee

eee

tees

4

4.6

Forward/Reverse

Playback

Level

Adjustment...

.......-.

0.2

eee

eee

ee

ee

eee

eee

ee

eee

4

5..

ELECTRICGAL-ADJWSTMENTS

ess

ceehtves

Soibbck

Baiaren

Son

ee

Mk

ae

ad

ee

ed

ote

5

5.1

Precautions

for

Adjustment

and

Measurement

.......-.

000

eee

ee

eee

ee

eee

ee

5

5.2

Head

Azimuth

Adjustment...

1...

2...

2

ee

eee

ee

eee

ees

5

5.3

Tape

Speed

Adjustment...

2.2.2.0...

0c

ee

ee

eee

ee

eee

eee

6

5.4

Playback

Equalizer

Measurement...

0.2.00...

ccc

ee

eee

ee

ee

ee

eee

tte

ee

eee

eee

6

5.5

Playback

Output

Adjustment

...

2...

6.

ce

ee

ee

eee

eee

eee

eee

6

5.6

Peak

Level

Meter

Measurement

......-.-

02.

e

ee

ee

eee

eee

eee

eee

ee

ee

ee

6

5.7

MPX

Filter

Adjustment

...

2.0.0.0

0

cee

ee

eee

eee

eee

eee

ete

ee

6

5.8

Record-Playback

Level

Adjustment

.........

00.

ee

eee

eee

ee

eee

eee

eee

eee

7

5.9

Recording/Playback

Frequency

Response

Adjustment...

..

2.0...

2.2

e

eee

eee eee eee

eee

ee

ee

eee

7

6:

(DISASSEMBLY

ese

he

Ses

od

Greets

Ads

teeta

eee

ae

ete

Se

eee

deg

ee

ane

wh

ON

eee,

8

6.1

Removing

the

Top

Cover

..

1.2...

2.

cece

ee

ee

eee eee

ee

eee

8

6.2

Removing

the

Front

Panel

..

2.0...

0...

ee

ee

ee

ee

eee

ee

eee

eee

8

6.3

Removing

the

Front

Chassis

0.0...

0.0

ce

eee

ee

eee

eee

ee

eee

eet

8

6.4

Removing

the

Main

P.W.

Board

.........

2.0.

ccc

ce

ee

eee

ee

ee

te

8

6.5

Removing

the

Mechanism...

2.2...

0

ee

ee

ee

eee

ett

ee

eee

eee

8

7.

BLOCK/LEVEL

DIAGRAMS

—

2...

ce

eee

ee

een

eee

enn

ne

tnie

9

8.

VOLTAGE

CONVERSION

oo.

ccc

cc

ee

ee

ee

een

ee

re

ene

eens

10

9.

TECHNICAL

SPECIFICATIONS

....

1...

en

ee

eee

ees

11

10.

WIRING

DIAGRAMS

§

....

1.

ee

eee

ee

ee

eee

12

11.

EXPLODED

VIEW

AND

PARTS

LIST

..........

2...

eee

ee

eee

eee

ees

14

12.

ELECTRICAL

PARTS

LIST

..

ww...

cc

cc

cc

ee

nee

ee

eee

nee

ete

ee

eens

21

13.

SCHEMATIC

DIAGRAM

...

2.1...

ee

eee

eee

eee

ee

eens

26

MARANTZ

MODEL

SD340

STEREO

CASSETTE

DECK

AUTO

REVERSE

SYSTEM

ween

geen

ene

ree

INTRODUCTION

This

service

manual

are

prepared

for

use

by

Authorized

Warranty

Station

and

contains

service

information

for

Marantz

Model

SD340

Stereo

Cassette

Deck.

Servicing

information

and

voltage

data

included

in

this

manual

are

intended

for

use

by

the

knowledgeable

and

experienced

technician

only.

All

instructions

should

be

read

carefully.

No

attempt

should

be

made

to

proceed

without

a

good

understanding

of

the

operation

of

the

Cassette

Deck.

The

parts

list

furnishes

information

by

which

replacement

parts

may

be

ordered

from

the

Marantz

Company.

A

simple

description

is

included

for

parts

which

can

be

usually

obtained

through

local

suppliers.

1.

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

repaired

or

corrected

before

AC

power

is

applied,

and

verified

before

return

to

user/customer.

Ref.

UL

Standard

No.

1270.

Para.

66.

3.

D

(Mandatory

Test

after

servicing

Electrical

Appliances,

effective

7-1-88).

2.

P.W.

BOARDS

As

can

be

seen

from

the

circuit

diagram,

the

chassis

of

your

Cassette

Deck

consists

of

the

following

units.

Each

unit

mounted

on

a

printed

circuit

board

is

described

within

the

square

enclosed

by

a

bold

dotted

line

on

the

circuit

diagram

R/P

MainAmp.

.....

mounted

on

P.W.

Board

PJ0O1

1.

2.

BiasOSC..........

mounted

on

P.W.

Board

PLO1

3.

Tape

Selector/

Dolby

NR

Switch

..

.

.mounted

on

P.W.

Board

PU01

4.

Direction

Switch

.

.mounted

on

P.W.

Board

PUO2

5.

L.&.D

Meter/Rec

Volume

..........

mounted

on

P.W.

Board

PX01

6.

Dolby

NR/B-C......

mounted

on

P.W.

Board

P600

7.

Power

Switch.......

mounted

on

P.W.

Board

P800

3.

TEST

EQUIPMENT

REQUIRED

FOR

SERVICING

For

measuring

or

checking

your

Cassette

Deck,

the

follow-

ing

instruments

and

materials

are

necessary.

VTVM

4.

DESCRIPTIONS

This

auto

reverse

stereo

cassette

deck

is

capable

of

single

direction

recording

and

reverse

playback.

Four

channel

heads

(fixed

type)

are

mounted

in

the

unit.

e

@

Audio

Oscillator

(AF

OSC)

4.1

FORWARD/REVERSE

Mechanism

Switching

.

ee

a.

Auto

Reverse

switching

at

the

end

of

the

tape:

©

Bandpass

Filter

(1

kHz)

When

the

tape

reaches

the

end,

the

direction

switch

©

IEC

A-Curve

Filter

(S072)

is

switched

to

the

ON

position

by

the

action

@

Woavrsnd

Blutiec

Mott

of

the

mechanism.

Voltage

of

—12V

is

applied

to

@

Torque

Meter

(Cassette

Type)

the

solenoid

(L071)

and

it

attracts

its

counterpart.

w:

Digital

Erequéney:

Counter

This

moves

the

mechanism

into

the

run

direction.

®@

Distortion

Meter

b.

Forward/Reverse

switching

by

the

direction

switch

@

Blank

Tapes

(Completely

erased

with

bulk

eraser)

QU24

is

switched

to

the

ON

position

by

the

opera-

TDK

AC-212

(Normal)

tion

of

direction

switch

SY01,

SYO2.

Voltage

of

TDK

AC-512

(Special/CrO2z)

—12V

is

applied

to

the

solenoid

(LO71)

and

it

TDK

AC-711

(Metal)

attracts

its

counterpart.

This

moves

the

mechanism

into

the

run

direction.

Note:

If

any

doubt

is

noted

in

a

measured

value,

use

new

c.

Depending

upon

constants

of

RU33

and

CU25,

tape.

QU24

will

only

come

on

when

CU25

is

charged,

even

if

SYO1

and

SYO2

are

kept

depressed.

The

ON

time

of

QU24

can

be

changed,

changing

attraction

©

Test

Tapes

(New

Tape)

time

of

the

solenoid,

by

varying

the

constants

of

MTT-111

Wow

and

Flutter,

Tape

Speed

;

RU33

and

CU25.

MTT-212

Measurements

of

Output

Level

Signal-

to-Noise

Ratio

d.

If

the

REC OFF

is

off

in

the

record

mode

in

the

MTT-150

Adjustment

of

Play

Back

Level

cases,

voltage

will

not

be

applied

to

the

solenoid

coil

MTT-216

Frequency

Response

(for

Normal)

(L071)

and

thus,

switching

operations

will!

not

be

MTT-316

Frequency

Response

(for

Special/CrO2

possible.

and

Metal)

e.

When

the

mechanism

is

the

record

mode,

switching

MTT-121

Cross

Talk

into

the

reverse

direction

does

not

occur

at

the

end

MTT-141

Channel

Separation

of

the

tape.

(13.20)

—=

PLAY,

REC

{OV}

pu2

40/0744

Ss

é)

an

Qu24

ean

eee

oe,

ls

ce

a

ar

RU33_

220k

wis

wo7l

CGQOOEOOQOOO®O

RU35

680

10.70V)

—

PLAY

/0V}

—_

—e——

—

i

I

RUIE_jyy

680

REV

PAUSE

ER-REW

MO?

|

as

te

®

=cille

syo2

syol

N

DIRECTION

as

ce

OO.

O—

N

x

3

a

so73

$074

so75

so76

sor?

so7l

|

4.2

Playback

Equalizer

Amplifier

4.3

Dual

Pre-Amp

for

Auto

Reversw

TA7405P

(025)

1.

The

playback

equalizer

uses,

for

auto

reverse

opera-

tions,

the

|C

TA7405P

dual

pre-amp.

This

integrated

circuit

has

a

two

channel

amplifier

and

a

forward/reverse

electronic

changeover

switch.

An

electronic

changeover

switch

is

also

internally

mounted

in

the

dual

equalizer

(Normal

120us,

CrO2/Metal

70s).

2.

The

forward/reverse

electronic

changeover

switch

allows

switching

between

the

two

channels

of

the

one

circuit,

IN

mes

=)

The

dual

equalizer

also

has

an

internally

mounted

electronic

changeover

switch

for

switching

between

the

two

channels.

I

\

!

Bias

circuit

\

!

|

a

ete

ee

Se

es

aes.

i

ae

a

se

a

Block

Diagram

©

Maximum

Ratings

(T,=

25°C)

Supply

Voltage

ee

@

Electrical

Characteristics

(Unless

otherwise

specified,

Vcc=

9V,

f=

1

kHz,

RL=

10

KQ,

Rg=

60022,

Ta=

25°C,

Normal

EQ)

Item

Symbol

Test

Min.

Typ.

Max.

Unit

Ieco

(1)

VIN=

0,

Normal

EQ

_

5.0

_

Quiescent

Current

mA

leco

(2)

Vin=

9,

Metal

EO

-

6.0

9.0

Loop

Voltage

Gain

Out

Gvo

C=

100uF,

Re=

0

_

98

—

|

aa

|

Max.

Output

Voltage

VOM

THD=

0.5%

1.5

2.0

-

Total

Harmonic

Distortion

THD

VouT=

0.5

Vrms

—

0.035

0.12

%

.

:

Rg=

6202,

Input

Noise

Voltage

Conversion

VIN

Bw=

20

Hz

~

20

kHz

=

0.9

1.7

LW

rms

f=

1

kHz

Gain

Conversion

Input

Resistance

Rin

_

500

_

K2

Ripple

Removed

R.R

f

ripple=

100

Hz,

Vin=

1Vrms

-

55

-

dB

Cross

Talk

C.T

VouT=

0

dBm

|

50

60

_

dB

|

F

orward/Reverse

Cross

Talk

C.T(F/R)

VouT=

0

dBm

60

lL

70

ca

cB

4.4

Operation

of

Playback

Equalizer

1,

When

the

mechanism

is

to

be

operated

in

the

forward

direction,

the

movement

of

the

mechanism

causes

the

switch

(SO75)

to

apply

+12V

pin

3

of

OJ25(TA7405P),

which

is

connected

to

the

forward

side,

and

pins

5

and

13

are

connected

to

the

internally

mounted

amplifier.

This

allows

operation

in

the

forward

direction

of

the

L

CH

and

R

CH

heads

connected

to

these

terminals.

2.

Switching

the

mechanism

into

the

reverse

direction

causes

the

switch

to

drop

the

voltage

applied

to

pin

3

(connected

to

the

reverse

side)

to

OV.

The

internally

mounted

amplifier

is

connected

to

pins

7

and

11.

This

allows

operation

in

the

reverse

direction

of

the

L

CH

and

R

CH

heads

connected

to

these

terminals.

3.

The

threshold

voltage

of

pin

3

only

switches

the

input

side

of

the

internal

amplifier,

the

output

side

for

forward

and

reverse

is

not

affected

by

switching

of

pin

2

(R

CH)

and

pin

16

(L

CH).

4.

Threshold

voltage

of

pin

3

(F/R

switching

voltage)

Reverse

0

~

0.5V

Forward

1.0

aad

vcc

4.5

Equalizer

Switching

1.

Playback

equalizer

switching

uses

the

normal

circuit

(SU01—3)

of

the

tape

selector

switch.

suol

-

3

(70S)

aha

|

tI5V

RK27

22k

2.

The

equalizer

is

set

to

120us.

SU01—3

is

grounded

when

the

normal

button

is

pushed

and

the

voltage

to

pin

15

drops

to

OV.

The

set

constant

of

120us

does

not

change.

3.

When

the

CrO2z

or

metal

button

of

the

tape

selector

is

pushed,

SU01—3

is

connected

to

a

+15V

source

and

voltage

is

applied

to

pin

15.

This

operates

the

switch

inside

the

IC,

connection

is

made

to

pins

4,

2,

and

14,

16,

switching

to

7Ous

occurs.

Thus,

the

set

constant

value

for

7Ous

is

the

compound

value

of

the

parallel

connected

constant

for

120us

using

pins

4

and

14.

4.6

Forward/Reverse

Playback

Level

Adjustment

This

unit

uses

four

channel

heads,

allowing

level

adjustment

of

differences

in

sensitivity

when

an

amplifier

is

used.

1.

Forward

direction

The

switch

(S075)

is

moved

by

the

mechanism

causing

+12V

to

pass

through

RJ33

and

RJ34

and

to

be

applied

to

the

base

of

QJ21

and

QJ22.

These

transis-

tors

are

turned

on

and

the

output

from

pins

2

and

16

passes

through

QJ21

and

QJ22.

The

level

gain

can

be

adjusted

by

RJ43

and

RJ44.

2.

Reverse

Direction

in

the

same

way

as

in

the

forward

direction,

the

switch

(S075)

causes

+12V

to

pass

through

RJ31

and

RJ32

and

then

for

the

voltage

to

be

applied

to

the

base

of

QJ23

and

QJ24.

These

transistors

are

turned

on

and

the

reverse

output

from

pins

2

and

16

passes

through

QJ23

and

QJ24.

The

level

gain

can

be

adjusted

by

RJ31

and

RJ32.

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5.

ELECTRICAL

ADJUSTMENTS

5.1

Precautions

for

Adjustment

and

Measurement

1)

Before

playing

back

the

test

tape,

thoroughly

demagne-

tize

the

heads,

capstan

and

similar

metal

parts

using

an

erase,

as

the

test

tape-recorded

tone

is

easily

erased.

2)

Do

not

place

the

test

tape

on

any

measuring

instru-

ment.

3)

Do

not

put

the

test

tape

near

a

place

where

the

eraser

is

used.

4)

Method

of

Demagnetization:

Turn

the

eraser

power

switch

on

at

a

position

far

away

from

the

heads.

Bring

the

eraser

close

to

the

heads,

capstan

and

other

parts

to

be

demagnetized,

and

move

it

up

and

down

four

or

five

times

to

demagnetize.

Slowly

separate

the

eraser

far

away

from

the

parts,

and

turn

the

power

switch

off.

5)

Do

not

use

any

magnetized

adjusting

tool.

If

necessary,

demagnetize

with

a

bulk

eraser

from

time

to

time

in

the

course

of

each

adjustment.

6)

Do

not

turn

semi-fixed

resistor

or

coil

more

than

needed.

7)

Measure

speed

and

wow

and

flutter

in

the

normal

operating

state.

8)

Do

not

apply

locking

bond

excessively.

Adjustment

Point

“bd

6

beuat

ee

TOP

VIEW

Ss:

5.2

Head

Azimuth

Adjustment

=

Set

the

TAPE

SELECT

Switch

to

the

NORM

position.

2.

Play

the

14

kHz

signal

of

the

test

tape

MTT256

back.

Adjust

the

head

azimuth

adjusting

screw

for

maximum

VTVM

reading.

3.

If

the

peak

output

reads

of

the

right

and

left

channels

are

different,

set

the

screws

to

obtain

the

mechanical

center

between

the

peaks.

4.

After

adjustment,

repeat

the

playback

and

stop

setting

a

few

times

to

make

certain

of

no

head

azimuth

decia-

tion.

5.

Then,

lock

the

screws

with

bond.

6.

Make

the

same

check

for

the

reveres

side.

Mode:

Playback

Test

Tape

MTT-256

(14

kHz)

5.3

Tape

Speed

Adjustment

Play

the

3

kHz

signal

of

the

test

tape

MTT-111

back.

Adjust

the

tape

speed

adjusting

resistor

inside

the

motor

(M071)

for

3015

to

3030

Hz

counter

indication.

Notes:

1.

tf

a

strong

shock

of

simitar

vibration

is

applied

to

the

back

after

adjustment,

make

certain

that

the

measured

tape

speed

had

not

changed.

2.

Be

careful

that

the

frequency

counter

may

indicate

a

wrong

value

because

of

too

low

counter

input

level.

3.

Before

adjustment,

allow

for

30

seconds

or

more

after

depressing

of

the

PLAY

button.

FREQUENCY

COUNTER

©

©

Mode:

Playback

Test

Tape

MTT-111

(3

kHz)

=

LINE

OUTPUT

5.4

Playback

Equalizer

Measurement

1.

Set

the

TAPE

SELECTOR

switch

to

the

NORM

posi-

tion.

2.

Playback

the

315

Hz

signal

on

test

tape

MTT-256

and

adjust

so

that

VTVM

indication

is

0

dB.

3.

Playback

the

12.5

Hz

signal

on

test

tape

MTT-256

and

make

sure

that

indication

is

within

3

dB

with

respect

to

the

315

Hz

signal.

4.

Measurement

the

reverse

side

in

the

same

manner.

Notes:

1.

Proceed

both

for

the

right

and

left

channels

in

the

same

manner.

Mode:

Playback

Test

Tape

MTT

-256

LINE

OUTPUT

5.5

Playback

Output

Adjustment

1.

Set

the

TAPE

SELECTOR

switch

to

the

NORM

posi-

tion.

2.

Playback

the

test

tape

MTT-150.

Adjust

RJ43

(L),

RJ44

(R)

so

that

the

terminal

voltage

at

the

Dolby

test

points

(TPOQ5-L,

TPO6-R)

becomes

580

mV.

3.

Next

push

the

direction

switch

and

begin

playback

in

reverse

direction.

Adjust

RJ41

(L)

and

RJ42

(R)

to

the

same

as

step

(2).

4.

After

rewinding

the

tape,

check

that

the

voltage

is

still

580

mV

when

replaying

it.

5.

When

checking

at

output

terminal

JJO4,

please

connect

a

100

kohm

load

resistor,

Output

level

is

390

mV.

Mode:

Playback

Test

Tape

TPOS(L)

MTT-150

ters

TPO6(R)

5.6

Peak

Level

Meter

Measurement

1.

Place

a

recording

tape

into

the

tape

mechanism.

Set

the

unit

to

record

pause.

2.

Apply

a

1

kHz

100

mV

signal

to

the

LINE

INPUT

jack.

3.

Adjust

the

input

of

the

RX16

until

the

voltage

at

the

Dolby

test

points

(TPO5-L

and

TPO6-R)

and

at

TP04

(GND)

is

580

mV.

4.

Check

to

make

sure

that

under

these

conditions,

the

reading

of

the

LED

peak

meter

lights

the

OG

mark

(OdB).

5.

Lower

the

input

signal

by

—3

dB

and

confirm

that

the

LED

reading

lights

at

—5

dB.

5.7

MPX

Filter

Adjustment

Set

the

TAPE

SELECT

switch

to

the

NORM

position.

Connect

the

1

kHz,

100

mV

input

signal

to

the

LINE

INPUT

cord.

3.

Setup

the

deck

to

the

recording

state.

Adjust

the

REC

LEVEL

control

for

0

dB

meter

reading

5.

Adjust

the

tine

output

level

for

0

dB,

andturn

the

DOLBY

NR

switch

to

the

ON

position.

6.

Turn

the

input

signal

to

the

19

kHz.

7.

Adjust

L601

(L)

and

L602

(R)

for

minimun

output

level.

nN?

>

Notes:

1.

Proceed

both

for

the

right

and

left

channds

in

the

same

manner.

2.

If

the

filter

characteristic

is

better

than

30

dB,

the

MPX

filter

needs

not

to

be

adjusted.

Mode:

Record

AF

OSC

YTVM

TONE:

1

kHz,

A

LINE

INPUT

LINE

OUTPUT

=

-5.8

Record-Playback

Level

Adjustment

Set

the

TAPE

SELECT

switch

to

the

NROM

position.

Connect

the

1

kHz,

—60

dBV

signal

to

the

MIC

jack.

Set

up

the

deck

to

the

recording

state.

Adjust

the

REC

Level

control

for

0

dB

LED

PEAK

LEVEL

meter

reading.

Play

the

recorder

portion

back

and

adjust

RK23

(L)

and

RK24

(R)

for

0

dB

LED

PEAK

LEVEL

meter

reading.

Proceed

both

for

the

right

and

left

channels

in

the

same

manner,

5.9

Recording/Playback

Frequency

Response

Adjustment

~

SOV

10.

Set

the

TAPE

SELECT

switch

to

the

NORM

position.

Connect

the

1

kHz

100

mV

Input

signal

to

the

LINE

Input

jack.

Set

up

the

deck

to

the

REC

PAUSE

mode.

Adjust

input

level

so

that

the

peak

level

meter

reads

0dB.

Attenuate

the

output

of

the

AF

osillator

by

25

dB.

Press

the

PAUSE

button

and

start

recoding.

After

recoding

the

1

kHz

signal

for

about

5

seconds.

Set

the

Frequency

to

12.5

kHz.

Same

manner

for

another

5

seconds.

Press

the

REW

button

and

return

to

the

beginning

of

the

recoding.

PALY

PAUSE

mode

is

entered.

Press

the

PAUSE

button

to

start

Playback

and

adjust

the

semi-fixed

resistor

RK25

(L),

RK26

(R)

so

that

the

difference

between

1

kHz

and

12.5

kHz

level

ts

from

0

dB

to

—1

dB.

Next,

Repeat

steps

6

to

8

using

a

CrO2

tape,

making

the

same

adjustments.

(Adjustment

point

RK32

L/R)

Perform

the

same

steps

for

Metal

tape

as

well.

{(Adjust-

ment

Point

RK33

L/R)

Note:

Independent

adjustment

of

(L)

and

(R)

is

not

pos-

sible

for

CrOz,

and

METAL

tapes.

Use

the

NOR-

MAL

POSITION

for

adjustment

if

there

is

a

great

difference

in

levels.