Nakamichi 350 User manual

4.

350

2

Head

Cassette

Deck

Operating

Instructions

WARNING

TO

PREVENT

FIRE

OR

SHOCK

HAZARD,

DO

NOT

EXPOSE

THIS

APPLIANCE

TO

RAIN

OR

MOISTURE.

‘A

record

of

the

serial

number

will

help

you

in

the

event

of

insurance

claims,

shipping

or

warranty

service.

Record

the

serial

number

(embossed

on

a

plate

on

the

rear

panel

of

the

unit)

in

the

space

provided

below.

Model

Number:

Nakamichi

350

Serial

Number:

Contents

Control

Functions

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

1,2

Important

Notices

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

3

Connections

...........00

cece

eeee

4,5,6

Mounting

Instructions

.......

Pe

ee

7

Fuse

Replacement

................000.

8

Playback

Procedure

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

9

Recommended

Cassette

Tapes

and

Tape

Selector

Switch

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

10

Record

Procedure

.................00.

11

Dolby

Noise

Reduction

System

..........

12

Maintenance,

Service

Information

........

13

Troubleshooting

Chart

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

14

DPECINICAUONS:

2

ooo

cao

cea

42a

15

AccessorieS

...........0c

cece

eee

ee

eeee

16

_

We

wish

to

take

this

opportunity

to

thank

you

for

your

purchase.

Your

Nakamichi

350

should

provide

you

with

many

years

of

trouble-free

use

assuming

it is

operated

and

maintained

as

outlined

in

this

manual.

Please

take

the

time

to

read

this

manual

in

its

entirety

before

attempting

to

operate

or

install

your

350.

If

you

are

using

your

350

with

one

of

the

ADS

miniature

speaker

systems,

which

we

most

strongly

recommend,

please

also

read

the

instructions

accompanying

the

ADS

product

before

proceeding

with

interconnections.

Thank

you.

Nakamichi

Corporation

Control

Functions

TAPE

COUNTER

Facilitates

the

location

of

pre-recorded

selec-

tions

on

the

cassette.

CASSETTE

LID

©

PAUSE

BUTTON.

Depressing

this

button

will

cause

the

tape

to

temporarily

halt

in

the

Play

or

Record

Mode.

Depressing

it

a

second

time

will

release

the

transport

from

the

Pause

mode.

FAST

FORWARD

BUTTON

—

PLAY

BUTTON

STOP/EJECT

BUTTON

=

It

is

necessary

to

depress

the

Stop

button

when

changing

from

one

transport

mode

to

another.

An

extra

firm

push

of

this

button

will

eject

the

cassette.

|

REWIND

BUTTON

RECORD

BUTTON

6

DC

12

VOLT

CAR

CONNECTOR

|

This

single

connector

interfaces

the

350

to

the

ADS

2002

system.

All

audio

and

power

connec-

tions

are

made

through

this

connector.

The

|

ADS

2002

system

is

supplied

12

volts

DC

only

when

the

350’s

play

button

is

depressed.

LEFT

AND

RIGHT

MIC

INPUT

JACKS

LINE

OUTPUT

JACKS

LINE

INPUT

JACKS

PEAK

LEVEL

METER

©

Reads

the

higher

of

the

left

and

right

channels

during

record

and

playback.

INPUT

LEVEL

CONTROLS

=—

Controls

line

input

recording

levels

unless

the

Left

and

Right

microphones

are

in

use,

in

which

case

these

control

the

L/R

Mic

input

levels.

Controls

are

concentric

and

friction

coupled

so

that

individual

levels

for

each

channel

may

be

set

separately.

,

BLEND

MIC

LEVEL

CONTROL

PHONES/OUTPUT

LEVEL

CONTROL

Controls

the

levels

at

the

Headphone

and

Line

outputs.

Controls

are

concentric

and

friction

coupled

so

that

L/R

balance

may

be

obtained.

TAPE

SELECTOR

SWITCH

DOLBY

NOISE

REDUCTION

SYSTEM

DC

12

VOLT

JACK:

use

of

the

350.

HEADPHONE

JACK

|

For

best

results

use

moderate

to

high

efficiency

stereo

headphones

within

the

impedance

range

of

8—16

ohms.

BLEND

MIC

INPUT

JACK

|

[ear

the

AC

Power

Pack

which

allows

home

Important

Notices

.

It

is

imperative

that

the

heads,

capstan

and

pressure

roller

be

cleaned

frequently.

Most

of

the

problems

you

are

likely

to

encoun-

ter

can

‘usually

be

traced

to

dirty

heads

and/or

dirty

capstan

and

pressure

roller.

See

page

13.

.

The

Nakamichi

350

is

equipped

with

the

B

type

Dolby

Noise

Reduction

circuitry.

Make

sure

to

switch

the

circuit

IN

when

playing

Dolby

encoded

cassettes

and

OUT

when

playing

non-encoded

cassettes.

.

The

EQ

switch

on

the

350

must

be

set

for

the

cassette

to

be

played.

The

choice

of

either

70

or

120

microseconds

will

depend

on

the

type

of

tape

and

which

equalization

was

used

during

the

recording

of

that

tape.

See

page

10.

.

Take

good

care

of

your

cassette

tapes.

They

should

always

be

stored

in

their

plastic

boxes

to

protect

them

from

dust.

Avoid

touching

the

tape

itself.

With

proper

care

your

cassette

tapes

will

provide

you

with

many

years

of

enjoyment.

.

Avoid

the

use

of

inferior

cassettes.

By

sticking

to

well

Known

brands,

you

can

avoid

premature

head

replacement

and

possible

damage

to

the

350’s

transport

mechanism.

WE

DO

NOT

RECOMMEND

THE

USE

OF

C-120

OR

CHROMIUM

DIOXIDE

CASSETTE

TAPES.

.

Wind

up

any

slack

in

the

tape

manually

before

inserting

the

cassette

to

prevent

the

possibility

of

jamming.

10.

The

Nakamichi

350

will

operate

only

in

12

volt

NEGATIVE

GROUND

systems.

When

installing

the

350

in

a

car,

boat

or

plane,

make

sure

its

normal

operating

position

is

as

level

as

possible.

Keep

the

12

volt

supply

wire

away

from

wiper

motors,

light

switches

or

any

other

device

that

is

likely

to

induce

unwanted

noise,

Do

not

install

the

350

too

close

to

heat

or

air

conditioning

ducts.

.

Even

in

mild

weather,

if

all

the

windows

are

kept

closed,

the

temperature

inside

a

car

may

rise

to

levels

high

enough

to

cause

damage

to

the

350

and

to

cassette

tapes.

The

350

and

the

tapes

should

be

removed

from

the

vehicle

if

it

is

to

be

parked

for

an

extended

period

in

direct

sunlight.

If

this

is

not

possible,

make

sure

there

is

some

ventilation,

and

keep

the

350

and

the

tapes

out

of

the

path

of

direct

sunlight.

Never

store

the

350

or

your

cassette

tapes

in

the

©

glove

compartment

or

the

trunk

for

long

periods

in

hot

weather.

Using

the

350

with

the

ADS

2002

—

System

|

The

Nakamichi

350

can

be

easily

connected

to

the

ADS

2002

bi-amplified

miniature

speaker

system

to

provide

an

extremely

high

quality

cassette

playback

system

in

automobiles,

planes,

boats

or

any

other

mobile

environment

with

a

12

volt

DC

source.

The

system

can

also

be

used

indoors

with

household

AC

power

by

utilizing

a

special

optional

AC

adaptor

available

from

ADS

(not

the

AD-550/551

AC

Power

Packs

manufactured

by

Nakamichi).

Connect

the

350

to

the

ADS

system

as

described

below:

1.

Locate

the

20

ft.

connecting

cable

supplied

68-pin

Female

Plug

with

the

ADS

system.

One

end

is

fitted

with

a

female

6

plug

and

two

“‘pigtail’’

wires.

.

The

two

pigtail

wires

should

be

connected

to

the

12

volt

DC

source

at

suitable

points

in

the

vehicle’s

wiring

system.

The

wire

with

the

built-in

fuse

holder

and

noise

suppres-

sion

choke

should

be

connected

to

the

+12

volt

source,

and

the

remaining

wire

should

be

secured

to

a

suitable

ground.

Consult

the

literature

accompanying

the

ADS

system

for

further

recommendations

on

connecting

the

system

to

the

battery

supply.

If

you

are

unfamiliar

with

your

vehicle’s

wiring

sys-

tem,

it

is

best

to

consult

a

qualified

mobile

stereo

systems

dealer.

Ground

—_—

“T

Noise

Suppression

Choke

Fuse

Hoider

20

ft.

cable

a

57

Le

SS

Connections

1

3.

Connect

the

female

6

connector

at

the

end

of

the

20

ft.

ADS

cable

to

the

male

6

12

volt

car

connector

on

the

rear

panel

of

the

Nakamichi

350

as

shown

in

the

illustration

below.

4.

Consult

the

ADS

operating

instructions

for

speaker

interconnections.

Note:

1)

Since

all

audio

and

power

connections

are

made

with

the

single

6

connector

it

is

unnecessary

to

make

any

connections

to

the

350’s

line

outputs.

;

2)

When

using

the

system

indoors

with

the

ADS

2002

AC

Adaptor,

follow

the

connecting

instructions

supplied

with

the

AC

Adaptor.

ADS

2002

Bi-amplified

Miniature

Speaker

System

Connections

2

Using

the

350

in

a

Home

System

1.

Connect

the

optional

AC

Power

Pack

to

the

DC

12

volt

jack on

the

350.

2.

Plug

the

AC

Power

Pack

into

the

wall

socket.

|

3.

Connect

the

line

output

jacks

of

the

350

to

the

‘’Tape

In’’

or

‘Tape

Play,”

jacks

of

the

amplifier

or

receiver

of

the

music

system.

Use

a

standard

double

phono

plug-to-phono

plug

stereo

connecting

cable,

and

observe

left

and

right

indications.

.

In

a

similar

manner,

connect

the

line

input

jacks

of

the

350

to

the

‘’Tape

Out’

or

“Tape

Rec’’

jacks

of

the

amplifier

or

re-

ceiver.

Phono

Plug

(right)

Phono

Plug

(left)

Amplifier

|

ae

ot

.

oo

Ol

Oo

©

88085

Stereo

Cable

AC

Power

Pack

ten

Connections

3

Using

the

350

with

its

Carrying

edge

of

the

case

to

make

sure

it

clears

2.

Connect

the

6-pin

connector

on

the

carrying

Case

(optional)

the

tape

counter

button

on

the

350.

case

to

the

6-pin

12

Volt

DC

Car

Connector

. .

c)

Once

the

350

is

properly

seated

in

the

on

the

rear

panel

of

the

350.

1.

Install

the

350

in

its

carrying

case

in

the

case,

tighten

the

thumbscrew

at

the

Note:

This

connector

should

be

unplugged

following

manner:

bottom

of

the

case

to

secure

the

unit.

when

the

rear

flap

of

the

carrying

case

a)

Open

the

rear

flap

of

the

carrying

case

.Note:

The

rear

flap

of

the

carrying

case

_

is

to

be

closed.

and

make

sure

that

the

6-pin

connector

should

be

turned

around

and

fastened

is

out

of

the

way.

On

the

side

of

the

carrying

case

to

keep

3.

Connect

microphones

and

headphone

to

the

b)

Slowly

slide

the

350

into

the

carrying

it

out

of

the

way.

appropriate

jacks

on

the

rear

panel

of

the

case

as

shown

in

the

illustration.

It

may

350.

be

necessary

to

slightly

lift

the

front

,

Nakamichi

350

Carrying

Case

ios

:

o

5

Oo

OQ

3

5

D

3}

oe

oO

“

Mounting

Instructions

Using

the

mounting

bracket

: ; ; ;

Nut

Nylon

Washer

Lock

Washer

,

Flat

Washer

.

Nut

1.

Choose

a

mounting

location

that

is

suffi-

Choose

the

holes

that

give

the

most

ciently

far

from

all

heat

and

air

conditioning

ducts

(especially

the

former).

Make

sure

that

the

350

can

be

mounted

as

level

as

-

possible.

2.

Using

the

upper

bracket

as

a

template,

drill

four

holes

using

a

6mm

or

1/4

inch

drill

as

shown

in

the

illustration.

3.

Attach

the

upper

bracket

to

the

dashboard

using

the

nuts,

washers

and

5

x

16

bolts

as

shown

in

the

illustration.

4.

Using

the

four

5

x

10

bolts,

washers

and

nuts,

attach

the

lower

bracket

to

the

upper

bracket

as

shown

in

the

illustration.

Choose

the

rear

holes

on

the

upper

bracket

that

yields

the

most

Jevel

installation

of

the

lower

bracket.

Lower

Bracket

5.

Place

the

350

on

the

lower

bracket

and

push

it

in

as

far

as

it

will

go.

6.

Tighten

the

two

dial

knobs

on

the

lower

bracket

to

secure

the

350.

7.

Make

the

appropriate

connections

as_in-

structed

on

page

4.

OYE

OT"

Fuse

Replacement

The

12V

supply

wire

for

the

350/2002

system

‘incorporates

an

in-line

fuse

holder.

The

fuse

inside

this

holder

will

blow

if

a

short

circuit

or

unusually

heavy

load

exists

in

the

power

line.

If

the

fuse

should

blow,

it

may

be

an

indication

of

an

error

in

wiring,

a

loose

wire

or

a

defect

somewhere

in

the

system.

Check

all

wiring,

then

replace

the

fuse

in

the

following

manner:

1.

Disconnect

the

6-pin

plug

from

the

rear

panel

of

the

350.

2.

Open

the

fuse

holder

by

first

pushing

the

two

ends

together

and

then

twisting

as

shown

in

the

diagram.

3.

Remove

the

blown

fuse

and

install

the

proper

replacement

(6

ampere,

fast-acting

type).

7

4.

Re-connect

the

6-pin

plug.

Note:

If,

upon

attempting

to

operate

the

sys-

tem,

the

fuse

blows

again,

have

the

system

checked

by

a

qualified

service

technician.

Playback

Procedure

1)

2)

3)

4)

5)

6)

\

Open

the

cassette

lid

by

firmly

pressing

the

Stop/Eject

button.

Insert

the

cassette

into

the

well

and

press

down

on

the

cassette

until

it

is

firmly

in

place.

Close

the

cassette

lid.

If

it

does

not

close

completely,

eject

the

cassette

and

repeat

step

2.

Select

the

proper

playback

equalization

by

using

the

Tape

Selector

switch.

If

you

are

unsure

of

which

position

to

use,

consult

the

table

of

recommended

cassette

tapes

on

page

10.

Depress

the

Dolby

NR

switch

to

the

“IN”

Position

if

the

tape

to

be

played

was

Dolby

encoded

during

record.

Depress

the

Play

button.

7)

8)

9)

10)

Turn

the

Output

Level

Control

to

the

desired

listening

level.

If

the

350

is

being

used

in

conjunction

with

a

home

music

system,

it

may

be

desirable

to

leave

the

Output

Level

Control

at

maximum

(fully

clockwise)

and

adjust

the

listening

volume

with

the

preamplifier/amplifier/receiver

in

the

system.

Depressing

the

Pause

button

will

tem-

porarily

halt

the

tape.

Depressing

the

Pause

button

a

second

time

wil!

resume

the

playing

of

the

cassette.

To

stop

the

cassette,

depress

the

-Stop/

Eject

button

lightly.

A

firm

push

of

this

button

will

cause

the

cassette

to

eject.

If

the

cassette

is

allowed

to

play

to

its

end,

the

350

will

automatically

return

to

the

Stop

mode.

Note:

The

350

has

no

power

switch

as

such.

Depressing

the

transport

function

but-

tons

automatically

turns

on

the

power.

The

entire

deck

is

“off”

in

the

stop

mode.

In

addition,

if

the

350

is

being

used

with

one

of

the

ADS

miniature

speaker

systems

with

the

proper

con-

necting

cables,

power

to

the

ADS

system

will

be

turned

‘‘on’’

only

when

the

Play

button

on

the

350

is

depressed.

The

tape

selector

switch

on

the

Nakamichi

350

_has

been

specially

designed

to

simultaneously

change

both

the

Bias

and

Equalization.

Although

the

unit

has

been

factory

adjusted

for

Nakamichi

EX

(or

EX

II)

tape

in

the

“EX”

position

and

for

Nakamichi

SX

tape

in

the

"SX"

position,

certain

other

tapes

shown

in

the

recommendation

table

below

may

be

used

with

excellent

results.

The

‘‘EX’’

position

utilizes

the

standard

120

microsecond

equalization

and

a

“high”

bias

(approximately

10%

higher

than

normal)

compatible

with

a

variety

of

low-

noise/high-output/high-density

formulations.

The

SX"

position

utilizes

the

“high

resolu-

tion’’

70

microsecond

equalization

and

a

special

bias

(approximately

45%

higher

than

normal)

which

allows

the

use

of

high

coercivity

tapes.

To

realize

the

full

potential

of

your

Nakamichi

cassette

deck,

it

is

recommended

that

you

use

one

of

the

following

cassette

tapes

(tapes

other

than

Nakamichi

are

listed

in

alphabetical

order):

Recommended

Cassette

Tape

and

Tape

Selector

Switch

-

Position

of

Tape

Selector

Switch

Nakamichi

Fuji

Maxell

TDK

Nakamichi

Fuji

Maxell

TDK

Type

or

Model

SX

FX

Il

UDXL-II

SA

C-60,

C-90

C-60,

C-90

C-60,

C-90

C-60,

C-90

C-60,

C-90

C-60,

C-90

C-60,

C-90

C-60,

C-90

C-60,

C-90

C-60,

C-90

10

11

Record

Procedure

1)

9)

3)

4)

5)

6)

7)

8)

Open

the

cassette

lid

by

firmly

depressing

the

Stop/Eject

button.

Insert

the

cassette

into

the

well

and

press

~down

on

the

cassette

until

it

is

firmly

in

place.

Close

the

cassette

lid.

If

it

does

not

close

completely,

eject

the

cassette

and

repeat

step

2.

Set

the

Tape

Selector

switch

to

the

proper

position

for

the

type

of

tape

in

use

(see

page

10.)

_

Depress

the

Dolby

NR

switch

to

the

“IN”

position

if

the

recording

is

to

be

Dolby

encoded.

Reset

the

Tape

Counter

to

‘000’

by

depressing

the

reset

button.

Depress

the

Pause

button.

Depress

the

Record

button.

While

holding

it

down,

push

the

Play

button

until

both

buttons

lock

into

place.

Adjust

the

recording

levels

while

in

the

Record/Pause

mode.

Take

a

sample

of

the

material

to

be

recorded

(pick

the

loudest

passage).

Set

the

Input

Level

Controls

so

10)

11)

that

the

Peak

Meter

indicates

just

up

to

the

red

(0

dB)

on

maximum

peaks

(see

note

below).

If

the

left

and

right

channels

are

to

be

checked

independently,

turn

only

one

Input

Level

Control

up

at

a

time

(hold

the

outer

knob

fixed

while

turning

the

inner,

and

vice

versa).

Start

recording

by

depressing

the

Pause

button

to

release

it.

At

the

end

of

the

recording,

stop

the

deck

by

depressing

the

Stop/Eject

button.

Note:

Recording

levels

will

vary

depending

On

the

type

of

source

material

and

the

type

of

tape

in

use.

With

certain

types

of

music

and

tape

it

may

be

possible

to

record

with

the

Peak

Meter

indicating

slightly

into

the

red.

Other

combina-

tions

may

require

more

conservative

level

settings.

It

is

best

to

experiment

with

various.

situations

to

gain

Maximum

familiarity

with

your

350.

2)

Plugging

microphones

into

the

350’s

left

and

right

mic

jacks

will

cause

the

line

inputs

to

be

blocked.

If

a

record-

ing

is

to

be

made

from

the

line

inputs,

make

sure

no

microphones

are

plugged

into

the

left

and

right

inputs

(this

does

not

apply

to

the

Blend

Mic).

.

3)

In

order

to

prevent

the

accidental

erasure

of

a

recording

at

some

future

date,

break

off

the

tabs

on

the

top

edge

of

the

cassette

as

shown

in

the

photograph

below.

This

will

prevent

the

recorder

from

going

into

the

record

mode.

Break

off

both

tabs

only

if

both

sides

A

and

B

are

to

be

protected.

The

tab

for

any

given

side

of

a

cassette

is

located

on

its

upper

left.

The

Dolby

Noise

Reduction

System

The

Nakamichi

350

incorporates

the

‘’B-Type”’

Dolby

Noise

Reduction

circuitry

under

license

from

Dolby

Laboratories,

Inc.

It

is

a

system

that

significantly

reduces

the

‘“‘hiss’’

noise,

which,

although

inherent

in

magnetic

tape

Dolby

Noise

Reduction

System

recording,

is

particularly

noticeable

in

cassette

recording

because

of

the

narrow

track

width

and

slow

tape

speed.

Such

tape

noise

is

generally

distributed

over

a

frequency

range

of

2

kHz

to

10

kHz.

Very

basically,

the

Dolby

System

reduces

the

noise

by

amplifying

the

signals

in

this

range

during

record

and

attenuating

them

during

playback

as

shown

in

Fig.

1.

INPUT

—

PREAMP.

—-|

DOLBY

|—

REC.AMP.

am

cg

ee

{-

_,

PLAYBACK

__

EQ.

AMP.

DOLBY

|

—-

PREAMP.

-+

OUTPUT

In

actuality,

however,

the

system

is

quite

a

bit

more

complicated

because

it

is

clear

that

if

all

high

frequency

signals

were

boosted

during

record,

the

tape

would

become

grossly

satu-

rated

and

the

sound

would

be

very

distorted.

The

Dolby

System,

therefore,

is

selective

in

its

boosting:

a

special

threshold

sensing

circuit

makes

sure

that

only

the

low

level

high

fre-

quency

signals

are

amplified

(the

lower

the

level,

the

greater

the

boost).

This

same

circuit

is

applied

in

reverse

during

the

playback

process

to

restore

flat

frequency

response.

In

attenuat-

ing

the

boosted

signals

it

also

reduces

the

noise.

If

high

frequency

signals

(at

4

kHz)

of

—40dB,

for

example,

enter

the

Dolby

circuit

during

record,

they

will

be

boosted

to

a

level

of

—30dB

before

being

recorded

onto

the

tape.

Then,

during

playback,

high

frequency

signals

entering

the

Dolby

circuit

at

a

level

of

—30dB

will

be

attenuated

to

a

level

of

—40dB.

The

accompanying

reduction

in

the

recorded

noise

will

be

10dB.

The

circuit,

however,

will

not

affect

signals

greater

than

—5dB

(see

Fig.

2).

Input

Signals

—40

-30

-20

-10

(dB)

‘o)

c

ot

n°]

c

--

2

So

3

ry

a

Amplification

&

Attenuation

at

4kHz

Fig.

2

Working

Principle

of

Dolby

NR

Circuit

As

is

clear

from

the

foregoing

explanation,

it

is

possible

to

gain

an

overall

improvement

in

signal-to-noise

ratio

of

approximately

10dB

if

a

tape

is

recorded

and

played

with

the

Dolby

System.

The

system,

furthermore,

is

interna-

tionally

standardized

so

that

any

tape

recorded

on

any

machine

with

Dolby

NR

can

be

played

on

any

other

machine

with

Dolby

NR.

12

13

Maintenance

Cleaning

All

parts

that

come

into

contact

with

the

tape

must

be

frequently

cleaned.

Even

the

best

tape

formulations

leave

a

deposit

of

oxide

sheddings

on

the

heads,

pressure

roller

and

capstan.

Failure

to

perform

a

periodic

cleaning

of

these

parts

can

result

in

signal

dropouts,

loss

of

high

frequencies

and

excessive

wow/flutter.

A

clean-

ing

kit

is

supplied

with

the

Nakamichi

350,

but

some

Q-tips

and

methanol

alcoho!

(preferably

undiluted)

will

perform

quite

adequately.

Dip

the

Q-tip

in

alcohol

and

squeeze

off

the

excess.

Rub

the

Q-tip

over

the

surface

of

the

heads.

To

clean

the

capstan

and

pressure

roller,

put

the

deck

into

the

play

mode

with

the

power

on.

Apply

the

moist

Q-tip

to

the

right

side

of

the

rubber

pressure

roller

(applying

to

the

left

side

may

cause

cotton

to

become

pressure

roller

ehead

[pb

head

7

|

/

f

\OY

a

caught

between

the

roller

and

the

capstan).

Move

the

Q-tip

about

so

as

to

clean

the

entire

surface

of

the

roller.

Then,

put

the

machine

into

the

fast

forward

mode

and

repeat

the

process

with

the

capstan.

Demagnetizing

All

metal

parts

that

come

into

contact

with

the

tape

must

be

occasionally

demagnetized

to

prevent

the

build-up

of

residual

magnetism

that

can

add

hiss

to

and

partially

erase

the

high

frequencies

on

a

tape

being

played.

Although

the

heads

and

capstan

of

Nakamichi

cassette

decks

require

demagnetization

much

less

fre-

quently

than

most

other

tape

decks,

it

should

nevertheless

be

performed

once

every

50

hours

of

use

to

be

on

the

safe

side.

A

Nakamichi

Demagnetizer

is

recommended

for

this

purpose

Since

it

is

specially

designed

for

ease

of

use

with

Cassette

decks,

but

any

properly

designed

demagnetizer

will

do.

Remove

all

tapes

from

the

vicinity

of

the

tape

©

player

before

proceeding.

Make

sure

the

tape

deck

is

OFF’.

Turn

the

demagnetizer

on

and.

slowly

bring

the

tip

as

close

as

possible

to

the

rec/pb

head.

Do

not

make

contact

with

the

head

unless

the

tip

of

the

demagnetizer

is

covered

with

thin

vinyl

or

rubber

to

avoid

scratching

the

surface

of

the

head

(a

piece

of

vinyl

tape

may

be

used

to

cover

the

tip

if

it is

not

already

covered).

Move

the

demagnetizer

tip

slowly

in

a

random

pattern

about

the

©

surface

of

the

head

for

at

least

10

seconds

and

then

slowly

move

it

toward

the

capstan.

Repeat

with

the

capstan,

and

then

slowly

withdraw

the

demagnetizer.

Turn

it

off

after

it is

at

least

2

feet

(approximately

60

cm)

from

the

player.

Never

turn

the

demagnetizer

off

while

it

is

close

to

the

head

or

capstan

as

this

may

semi-

permanently

magnetize

the

metal

part.

It

is

not

necessary

to

demagnetize

the

erase

head.

Lubrication

The

moving

parts

of

the

Nakamichi

350

trans-

port

are

fitted

with

oil-less

bearings.

It

is

not

necessary

for

the

user

to

provide

lubrication.

SERVICE

INFORMATION

Repairs

Please

read

the

Warranty

Card

and/or

notices

accompanying

this

unit

very

carefully.

We

sincerely

trust

that

you

will

never

ex-

perience

difficulties

with

your

Nakamichi

350,

but

should

it

ever

require

servicing,

please

consult

your

Nakamichi

dealer

or

the

Naka-

michi

dealer

closest

to

you.

As

there

are

no

user

serviceable

parts

inside

the

unit,

please

do

not

attempt

your

own

repairs.

Thank

you

for

your

confidence

in

Nakamichi

products.

CONDITION

‘No

power

‘No

sound

Noise

during

playback

Excessive

wow

and

flutter

Dropout

of

sound

Distortion

Loss

of

high

frequencies

No

fast

forward

or

rewind

PROBABLE

CAUSE

Biown

Fuse.

Ignition

key

switch

is

‘‘off"’.

No

AC

power

to

AC

adaptor.

Poor

Connection:

Tape

loose

inside

cassette.

Poor

cassette

insertion.

Jammed

cassette.

Dirty

heads,

capstan,

roller.

Poor

connection.

(Hiss

noise)

Head

is

magnetized.

Poor

power

or

audio

connection.

Induced

engine

or

motor

noise.

Dirty

heads,

capstan,

pressure

roller.

Defective

cassette.

Poor

recording.

Distorted

recording.

Dirty

head.

Deformed

tape.

Magnetized

head.

Dirty

head.

Improper

EQ

selected.

Dolby

NR

_

being

used

with

non-encoded

tape.

Poor

tape

winding.

Troubleshooting

Chart

REMEDY

Replace

Fuse.

Turn

on

ignition

key

switch.

Check

AC

power

source.

Use

a

different

wall

outlet,

if

necessary.

Check

all

power

connections.

Eject

cassette,

wind

up

any

slack

and

re-insert.

Eject

cassette

and

re-insert.

Replace

or

repair

cassette.

Clean

all

dirty

parts.

Check

all

audio

connections.

Demagnetize

heads

and

capstan.

Re-check

all

connections.

Re-position

all

audio

and

power

wiring

away

from

motors,

ignition

lines,

etc.

Clean

all

dirty

parts.

Replace

or

repair

cassette.

Re-record

or

replace

cassette.

Re-record

or

replace

cassette.

Clean

head.

.

Replace

cassette.

Demagnetize

heads

and

capstan.

Clean

head.

Select

proper

EQ

switch

position.

Switch

Dolby

NR

off.

Eject

and

re-insert

cassette.

Replace

if

necessary.

Uneven

sound

Crosstalk

Dirty

heads,

capstan,

pressure

roller.

Dirty

capstan,

pressure

roller.

Clean

all

dirty

parts.

Clean

all

dirty

parts.

14

15

@

The

word

“DOLBY

NR”

and

the

Double-D-Symbol

are

trade-

Specifications

Power

Supply

--s-s+seeesseseeeseeeees

12

V

DC

(AC

with

AC

Power

Pack)

Power

Consumption

—

«+--+.

5W

Tape

Speed

edesavebchcndedenecasswives

1-7/8

inches

per

second

4.8

centimeters

per

second

Wow

&

Flutter

-----ceecsesesreeeeees

Less

than

0.13%

(DIN

45507

Wtd

Peak)

Less

than

0.08%

(Wrms)

Frequency

Response

.....-......

40

—

15,000

Hz

+3

dB

(SX,

EXII

tapes,

with

or

w/o

Dolby)

Signal-to-Noise

Ratio

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

Better

than

58

dB

(@

400

Hz,

3%

Distortion,

CCITT,

Wrms,

SX

tape)

Total

Harmonic

Distortion

...

Less

than

2%

(@

400

Hz,

0

dB)

EraSUre

ccrrccccceerseceeeeeesersveseeeseees

Better

than

60

dB

(@

1

kHz

saturation

level)

Channel

Separation

«++...

Better

than

35

dB

(@

1

kHz,

0

dB)

Crosstalk

—

sssssssscsessesesesesesseeeees

Better

than

60

dB

(@

1

kHz,

OdB)

Bias

Frequency

----rcssseesesereseee

105

kHz

Input

Sensitivity

/Impedance

NATGm

©

aetecesncecndecsacdasioses

0.2

mV/600

ohms

Blend

Mic

+--+...

«-

0.2

mV/600

ohms

CAA.

Aeeiseskecicttensee

assess

-

50

mV/50

kohms

Output

Level

Pind:

cieitad

tee.

580

mV

(0

dB)

Headphone

—

-ee---e-+-e

2

mW

into

8

ohms

(0

dB)

DiMeNsiONns

es-sersereesseeeeesreeees

7-1/3"

(W)

x

3-1/2""(H)

x

9-1/2"

(D)

inches

186(W)

x

90(H)

x

242(D)

mm

WEIGH

creserrrceceeecesserreeseecseeecees

6.6

Ibs.

(3

kg)

e

Specifications

and

appearance

design

are

subject

to

change

for

further

improvement

without

notice.

e

Dolby

NR

under

license

from

Dolby

Laboratories.

marks

of

Dolby

Laboratories.

186(7%")

182(7%")

Optional

Accessories

Heavy-Duty

Carrying

Case

EXII

Cassette

Tape

C-60,

C-90

Nakamichi 350 User manual

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