Akai CS-34 User manual

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1

Table of contents

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CASSETTE

TAPE

DECK

MODEL

CS

_

34

D

ALSO

APPLICABLE

TO

MODEL

CS-34

CASSETTE

TAPE

RECORDER

SECTION

1

SERVICE

MANUAL

..............-0

20

cece

neces

3

SECTION

2.

PARTS

LIST

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

2.0...

cece

ence

ees

17

SECTION

1

SERVICE

MANUAL

TABLE

OF

CONTENTS

SPECIFICATIONS

©.

35:4

Wisc.

asees

ego

encased

elegans

ete

oysea

30s

Sata

Nee

Poe

enare

ed

DISMANTLING

OF

UNIT

.......

0...

ccc

eens

ARRANGEMENT

OF

PRINCIPAL

PARTS

«..........00

00s

eee

eee

MECHANISM

ADJUSTMENTS

...........

2

ee

cee

cee

cece

neces

1.

PAUSE

LEVER

ADJUSTMENT

.........

002

ccc

cee cee

eee

eens

2.

ADJUSTMENT

OF

GAP

BETWEEN

TAKE-UP

REEL

TABLE

AND

TAKE-UP

WHEEL

AT

PAUSE

MODE

..........

.

F.FWD

SLIDE

ADJUSTMENT

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

00000.

e

cece

ee

eee

.

RWD

SLIDE

ADJUSTMENT...

2...

eee

tenes

.

REC.

SLIDE

ADJUSTMENT

...

2.0...

0c

ccc

ccc

cee

eee

.

OPERATION

SWITCH

POSITION

ADJUSTMENT

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

.

MUTE

SWITCH

ADJUSTMENT

.....

0.02...

cece

ce

eee

eee

.

TAKE-UP

TORQUE

AT

VARIOUS

MODES

AND

TORQUE

MEASURING

METHOD.............

9.

PINCH

WHEEL

PRESSURE

MEASURING

METHOD

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

HEAD

ADJUSTMENT

.........

0.0.

c

ccc

cece

cette

eee

t

eens

AMPLIFIER

ADJUSTMENTS

...........

00.

c

ec

ce

cee

ee

eee

eee ees

DOLBY

N.R.

CIRCUIT

ADJUSTMENT

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

0.

cece

eee

.

D.C.

RESISTANCE

OF

VARIOUS

COILS

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

0.0.

ee

eee eee

CLASSIFICATION

OF

VARIOUS

P.C.

BOARDS

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

020.0005

1.

P.C.

BOARD INTERCHANGEABILITY

CHART

...............0..

2.

COMPOSITE

VIEWS

OF

COMPONENTS

..........

00.20

c

eee

ene

i

—

on

HM

FF

WY

Rgas

For

basic

adjustments,

measuring

methods,

and

operating

principles,

refer

to

GENERAL

OPERATING

PRINCIPLES

AND

ADJUSTMENTS.

I.

SPECIFICATIONS

An

asterisk

next

to

a

figure

indicates

the

minimum

guaranteed

performance.

TRACK

SYSTEM

4

track

2

channel

stereo

system

TAPE

SPEED

E

1-7/8

ips.

(4.75

cm/sec)

+3%

WOW/FLUTTER

Less

than

0.13%

WRMS

*Less

than

0.28%

RMS

TOTAL

WOW/FLUTTER

*Less

than

0.35%

RMS

FREQUENCY

RESPONSE

LOW

NOISE

TAPE

CHROME

TAPE

40

to

13,000

Hz

+3

dB

*40

to

12,000

Hz

+3

dB

40

to

15,000

Hz

+3

dB

DISTORTION

FACTOR

L

*40

to

13,000

Hz

+3

dB

Less

than

1.5%

TOTAL

DISTORTION

FACTOR

*Less

than

3%,

1,000

Hz,

“0”

VU

recording

SIGNAL

TO

NOISE

RATIO

Better

than

52

dB,

1,000

Hz,

“0”

VU

recording

*Better

than

48

dB

TOTAL

SIGNAL

TO

NOISE

RATIO

*Better

than

43

dB

RESIDUAL

NOISE

if

Less

than

10

mV/8

ohm

load

(CS-34

only)

OUTPUT

LINE

OUTPUT

0.775V

(0

dBm

+1.5

dB)

using

a

333

Hz,

“0”

VU

pre-recorded

tape

DIN

OUTPUT

0.55V

(-3

dBm

+1.5

dB)

using

a

333

Hz,

“0”

VU

pre-recorded

tape

HEADPHONE

OUTPUT

30

mV/8

ohm

using

a

333

Hz,

“0”

VU

pre-recorded

tape

SPEAKER

OUTPUT

2W/8

ohm

each

channel

(CS-34

only)

INPUT/IMPEDANCE

MIC

INPUT

More

than

0.35

mV/4.7

k

ohm

LINE

INPUT

More

than

80

mV/510

k

ohm

DIN

INPUT

More

than

3

mV/25

k

ohm

RECORDING/PLAYBACK

LEVEL

0

dBm

+2

dB,

1,000

Hz,

“0’”’

VU

recording

ERASE

RATIO

Better

than

70

dB

CROSS

TALK

Better

than

25

dB,

1,000

Hz

+3

VU

recording

*Better

than

65

dB

RECORDING

BIAS

FREQUENCY

BIAS

LEAK

60

+5

kHz

Less

than

-45

VU

with

recording

volume

at

position

“6”.

een

RECORDING

TIME

FAST

FORWARD

AND

REWIND

TIME

HEAD

RECORDING/PLAYBACK

HEAD

ERASE

HEAD

90

min.

using

a

C-90

cassette

tape

Within

80

seconds

using

a

C-90

cassette

tape.

4

track

2

channel

recording/playback

head

Type:

P4-303

Gap:

1

micron

Impedance:

1,050

ohm

+25%

at

1

kHz

D.C.

Resistance:

110

ohm

2

track

1

channel

erase

head

Type:

E4-100

Gap:

0.3mm

Impedance

:

730

ohm

+10%

at

100

kHz

1

DOC.

Resistance:

5.2

ohm

MOTOR

Mechanical

Governor

Type

D.C.

Motor

Type:

MHT-5PS

Specified

Voltage:

13.2V

Revolutions:

2,200

rpm

TRANSISTORS/F.E.T.

2SC1647

(R)

(S)

(E)

2SC1648

(R)

(S)

(E)

(U)...

6

2SA628

(E)

(F)

2SC458LG

(C)

(D)......

4

2SC94SL

(Q) (R)

..----

2

2SK34

(D)..

6...

eee

eee

2

2SC1096

(K)

(L)

.....-

2

DIODES

IN60...........

6

WZ-085

.........

1

IN4001.........

8

W213

90

int

areca

1

1S2473VE.......

8

WZ-192

1.2.04.

1

SR-103D

........

1

10D05

..........

4

(CS-34

only)

LC.

LC-4032

........

2

(CS-34

only)

POWER

REQUIREMENT

Universal

Models:

110

to

240V

A.C.,

50/60

Hz

Japan

Models:

100V

A.C.,

50/60

Hz

CSA

Models:

120V

AC.,

60

Hz

CEE

Models:

220V

A.C.,

50

Hz

BSI

Models:

240V

A.C.,

50

Hz

POWER

CONSUMPTION

CS-34D:

12W

CS-34:

25W

i

a

S0—0—_—0_._—0—

DIMENSIONS

378(W)

x

110(H)

x

225(D)

mm

(14.9

x

4.3"

x

8.9")

(includes

all

protruding

parts)

WEIGHT

CS-34D:

4.8

kg

(10.6

lbs.)

CS-34:

4.9

kg

(10.8

lbs.)

NOTES:

1.

Specifications

determined

with

Low

Noise

Tape

unless

otherwise

noted.

2.

Specifications

subject

to

change

without

notice.

Ii.

DISMANTLING

OF

UNIT

In

case

of

trouble,

etc.

necessitating

disassembly,

please

disassemble

in

the

order

shown

in

photographs.

Reassemble

in

reverse

order.

CONTROL

KNOBS

VU

PANEL

LID

COVER

FRONT

PANEL

WOOD

FRAME

LOWER

COVER

ADJUSTMENT

lil.

ARRANGEMENT

OF

PRINCIPAL

PARTS

VU

METER

CASSETTE

BASE

D.C.

MOTOR

LAMP

P.C,

BOARD

CG-5003

DOLBY

N.R.

SWITCH

LIMITER

SWITCH

a

TAPE

SELECTOR

INDEX

COUNTER

LAMP

P.C.

BOARD

CJ-l038

PAUSE

SWITCH

POWER

SWITCH

HEADPHONE

JACK

MIC

JACK

RECORDING

MICRO

SWITCH

HEAD

BLOCK

PAUSE

BUTTON

EJECT

BUTTON

KEYBOARD

BLOCK

FLYWHEEL

OPERATION

SWITCH

POWER

SWITCH

PRE,

AMP.

P.C.

BOARD

Cw-5214

(2D)

MUTE

SWITCH

Post

ea

eto

fe

alow

. -

;

Sib

;

AUTOMATIC

STOP

MECHANISM

POWER

TRANSFORMER

D.C.

MOTOR

IV.

MECHANISM

ADJUSTMENTS

PAUSE

LEVER

PINCH

WHEEL

ARM

Fig.

1

WIND

PULLEY

TAKE-UP

REEL

TABLE

:

WIND

PLATE

SPRING

7

SUPPLY

REEL

TABLE

:

0.5mm

_-7:

WIND

PULLEY

"

RwD

REAR

SIDE

“S—

RWD

SLIDE

STOP

Fig.

4

1.

PAUSE

LEVER

ADJUSTMENT

(See

Fig.

1)

Bend

the

part

of

pause

lever

indicated

by

arrow

in

Fig.

1

so

that

at

playback

mode,

the

gap

between

the

pinch

wheel

arm

and

pause

lever

is

more

than

0.5

mm.

2.

ADJUSTMENT

OF

GAP

BETWEEN

TAKE-UP

REEL

TABLE

AND

TAKE-UP

WHEEL

AT

PAUSE

MODE

(See

Fig.

2)

Bend

the

take-up

lever

in

the

direction

of

the

arrow

in

Fig.2

so

that

when

the

machine

is

set

to

pause

mode

from

playback

mode,

the

take-up

wheel

com-

pletely

separates

from

take-up

reel

table

pulley

and

the

gap

width

is

from

0.3

to

0.5mm.

3.

F.LFWD

SLIDE

ADJUSTMENT

(See

Fig.

3)

Adjust

by

bending

the

F.FWD

Slide

so

that

when

the

F.FWD

and

STOP

buttons

are

gently

braked

simulta-

neously,

the

wind

pulley

separates

from

the

take-up

reel

table

and

this

gap

width

is

0.5mm.

TAKE-UP

REEL

TABLE

PULLEY

TAKE-UP

LEVER

0.3

to

0.5mm

TAKE

-UP

WHEEL

PAUSE

SLIDE

Fig.

2

WIND

PLATE

SPRING

REAR

SIDE

Fig.

3

OBTAIN

PARALLELISM

BETWEEN

ARROW

MARK

WIND

SPRING

Fig.

5

4.

RWD

SLIDE

ADJUSTMENT

(See

Fig.

4)

Adjust

by

bending

the

Rewind

Slide

so

that

when

the

RWD

and

STOP

Buttons

are

gently

braked

simultaneously,

the

wind

pulley

separates

from

the

Supply

Reel

table

and

this

gap

width

is

0.5mm.

NOTE:

In

the

event

that

by

bending

the

F.Fwd

and

Rwd

Slides

a

0.5mm

gap

on

both

cannot

be

attained,

check

the

wind

spring

for

parallel-

ism.

If

it

is

not

parallel,

remove

and

bend

wind

spring

by

hand

to

obtain

parallelism.

(See

Fig.

5)

REC.

SLIDE

REC,

MICRO

SWITCH

ADJUSTMENT

POINT

Fig.

6

i

SETTING

SCREW

|__MUTE

SWITH

REC.

SLIDE

HEAD

BASE

Fig.

8

5.

REC.

SLIDE

ADJUSTMENT

(See

Fig.

6)

At

Stop

mode,

bend

adjustment

point

(phosphor

bronze

plate)

of

Rec.

Slide

toward

arrow.

(Fig.

6)

When

the

Rec.

Button

is

depressed,

the

phosphor

bronze

plate

must

properly

turn

ON

the

Rec.

microswitch.

6.

OPERATION

SWITCH

POSITION

ADJUSTMENT

(See

Fig.

7)

Loosen

setting

screw

and

move

switch

base

in

direc-

tion

of

arrow

in

Fig.

7

until

when

PLAYBACK,

F.FWD

or

RWD

mode

is

effected,

the

wind

slide

turns

ON

Operation

Switch

perfectly

and

fix

setting

screw

to

maintain

optimum

condition.

7.MUTE

SWITCH

ADJUSTMENT

(See

Fig.

8)

Loosen

setting

screw,

and

move

Mute

Switch

back

and

front

and

set

so

that

at

Playback

or

Recording

mode,

Head

Base

turns

OFF

the

Mute

Switch.

SETTING

SCREW

WIND

SLIDE

Fig.

7

|

CASSETTE

TORQUE

METER

Ea

ee

CI

Fig.

9

:)

SPRING

SCALE

PINCH

WHEEL

PRESSURE

300250q

PINCH

WHEEL

ARM

Fig.

10

8.

TAKE-UP

TORQUE

AT

VARIOUS

MODES

AND

TORQUE

MEASURING

METHOD

(See

Fig.

9)

As

shown

in

Fig.

9,

set

a

cassette

torque

neter

on

cassette

base,

and

take

a

reading

of

the

A

inlication

at

each

respective

mode.

Playback

mode

50

+

10

gr-cm

F.FWD

mode

80

gr-cm

RWD

mode

80

gr-cm

NOTE:

Take

the

torque

meter

indicatio

value

+10

gr-cm

as

recorder

Take-up

torqu:.

9.

PINCH

WHEEL

PRESSURE

MEASURING

METHOD

(See

Fig-

10)

As

shown

in

Fig.10,

at

playback

mode,

pess

the

pinch

wheel

arm

toward

shaft

with

a

spring

sale,

and

when

the

pinch

wheel

separates

from

the

:apstan,

read

the

spring

scale

indication.

V.

HEAD

ADJUSTMENT

HEAD

HEIGHT

ADJUSTMENT

SPACERS

TAPE

REC/RB

HEAD

P4-303

AZIMUTH

ALIGNMENT

NUT

Fig.

11

NOTES:

1)

Clean

heads

prior

to

head

adjustment.

2)

Be

careful

not

to

use

a

magnetized

driver

or

other

magnetized

tools

in

the

vicinity

of

the

heads.

3)

Use

only

new

tape

as

level

variation

is

likely

to

occur

when

using

old

tape.

4)

Demagnetized

heads

with

head

demagnetizer

before

and

after

head

adjustment.

5)

As

perfect

head

adjustments

are

vital

to

tape

deck

or

recorder

performance,

be

sure

that

these

adjustments

are

carried

out

properly.

VI.

AMPLIFIER

ADJUSTMENTS

Adjustment

Item

aioe

Tape

Mod

Aaiusimaett

Result

Remarks

Supply

Signal

Point

ee

Playback

Level

333

Hz

“0”

VU

VR-4

ig

Adjustment

Test

Tape

Pu,

1

k(B)

OF

ieeem

|

Recording

Level

Low

Noise

Blank

Rec

VR-3

Set

Tape

Adjustment

Tape,

1,000

Hz,

and

20

k(B)

0+2

dBm

Selector

to

(Low

Noise

Tape)

“Q”?

VU

recording

Play

|

(CW-5214)

LOW

NOISE

ee

Se

S|

Low

Noise

Blank

10,000

Hz

Frequency

Response

Tape,

1,000

Hz,

Rec

VR-5

0+

1.0

dB

Adjustment

and

200

k(B)

:

:

(Low

Noise

Tape)

10,000

Hz,

-20

VU

Pla

(CW-5214)

in

relation

al

acai

ene

recording

4

to

1,000

Hz

Chart

1

NOTES:

1.

Set

Tape

Selector

to

LOW

NOISE

2.

Set

Dolby

N.R.

Switch

to

OFF

position.

3.

Use

new

tape

4.

The

letter

b

following

an

adjustment

parts

number

indicates

“right

channel”