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AKAL

TAPE

RECORDER

woo.

IWI=10

2B

BO

MRR

SSS

<

TABLE

OF

CONTENTS.

SPECIFICATIONS

....

0.

cece

ee

ene

1

MEASURING

METHOD

......

2...

00

eee

eee

ees

2

CONTROL

LOCATIONS

...

2.0...

eee

eee

ee

eee

4

DISMANTLING

OF

TAPE

TRANSPORT

UNIT

&

AMPLIFIERS

....

2.6.06.

ccs

ence

eee

eee

ees

5

TRANSPORT

MECHANISM

..........0-02

02

eee

eee

7

MECHANISM

ADJUSTMENT

............-2+2

2000)

11

AMPLIFIER

ADJUSTMENT

...

1.0.0...

eee

ee

eee

eee

19

MAINTENANCE

PROCEDURES

.......-..-2--00055

21

COMPOSITE

VIEWS

OF

COMPONENTS

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

22

TROUBLE

SHOOTING

CHART

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

05s

25

SCHEMATIC

DIAGRAM

I.

SPECIFICATIONS

STYLE

:

Portable

WEIGHT

37.4

lbs

(17

kg)

DIMENSIONS

14”

x

14”

x

8-7/8”

(358

x

358

x

227

mm)

POWER

SUPPLY

AC

100

to

240

V,

50/60

Hz

RECORDING

SYSTEM

In-line

4-track

stereo,

monaural

record-

ing

by

using

Cross-field

Bias

Head.

PLAYBACK

SYSTEM

IN-line

4-track

stereo,

monaural

play-

back.

TAPE

SPEED

1-7/8,

3-3/4

and

7-1/2

ips.

TAPE

SPEED

DEVIATION

Within

+

0.8%

WOW

AND

FLUTTER

(Play

back

only)

:

Less

than

0.1%

1r.m.s.

at

7-1/2

ips.

Less

than

0.2%

r.m.s.

at

3-3/4

ips.

Less

than

0.3%

r.m.s.

at

1-7/8

ips.

FREQUENCY

RESPONSE

30

to

25,000

Hz

+

db

at

7-1/2

ips.

30

to

18,000

Hz

+

db

at

3-3/4

ips.

40

to

9,000

Hz

+4

db

at

1-7/8

ips.

SIGNAL

TO

NOISE

RATIO

:

Better

than

48 db

(Forward

Operation)

-

Better

than

45

db

(Reverse

Operation)

DISTORTION

Within

3%

at

Line

Output,

1,000

Hz

O

VU

Recording

and

Playback.

CROSS

TALK

Less

than

—65

db

(Monaural)

Less

than

—43

db

(Stereo)

ERASE

RATIO

Less

than

—70

db

INSULATION

RESISTANCE

:

More

than

50

M.Ohms

INSULATION

DURABILITY

:

$00

V.

AC

for

more

than

one

minute

duration.

LINE

OUTPUT

Output

Impedance

........

100

Ohms.

Required

load

impedance

more

than

25

K.Ohms.

1.23

V

(+4

dbs)

POWER

OUTPUT

8

Watts

(r.m.s.)

per

channel,

total

16

(External

watts

.

Speaker

Jack)

Inpedance:

«4

vscceas

coeds

8

ohms

DIN

OUTPUT

:

O4V

Output

Impedance

.......

10

K.Ohms.

Required

load

impedance

more

than

50

K.Ohms.

LINE

INPUT

Above

50

mV

(~25

dbs)

Impedance

.......:.....

175

k.Ohms.

DIN

INPUT

High

........

Above

50

mV

(—25

dbs)

Impedance

........

150

mV

(—45

dbs)

LOW

exe

ee

ont

Avove

5

mV

(—45

dbs)

Impedance

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

27

K.Ohms.

MIC.

INPUT

Above

0.5

mV

(—65

dbs)

Impedance

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

4.7

K.Ohms.

FAST

FORWARD

AND

REWIND

TIME

:

85

seconds

for

a

full

1,200

foot

tape

at

50

Hz.

65

seconds

for

a

full

1,200

foot

tape

at

60

Hz.

MONITOR

SYSTEM

:

The

program

being

recorded

can

be

monitored

by

using.

Stereo

Headphonc

(8

Ohms)

.......

Stcteo

Headphone

Jack.

Crystal

Receiver

.

Line

Output

Jack.

MOTORS

CAPSTAN

MOTOR

Hysteresis

Synchronous

3-speed

(2-4-8

pole)

motor

Condenser

Capacity

3

uF

(50

Hz)

2

uF

(60

Hz)

Revolution

3,000

—

1,500

750r.p.m.

(50

Hz)

3,600

—

1,800

900r.p.m.

(60

Hz)

REEL

MOTOR

i112,outer-rotor

motors.

Revolutions

930

r.p.m.

at

50

Hz

100

V

1,120

r.p.m.

at

60

Hz

110

V

HEADS

REC/PLAY

HEAD

:

In-line

4-track

stereo

and

monaural

Impedance

...

1,200

Ohms

at

1,000

Hz.

Capi:

fii

ote

Bae

OF

Se

2/1,000

mm

ERASE

HEAD

In-line

4-track

stereo

Impedance

......

500

Ohms

at

60

KHz.

Gap:

erected

Be

0.2mm

BIAS

HEAD

In-line

4-track

stereo

Impedance

......

500

Ohms

at

60

KHz.

Gap:

:onccrseea

ea

taal

aca

Se

0.2

mm

RECORDING

LEVEL

INDICATOR

VERTICAL

Indication

VU

Meter

x

2

TRANSISTOR

&

IC

USED

2

ICAA-072D

4

2SD92

2

2SC458

(B)

7

28C372

4

2SC693FU

4

2SC971

1

2SD223

DIODE

USED

1

SB-3-01P

3

IN34A

1

10D4

15B2

4

V06C

1

RD24A

(M)

REELS

USED

7”,

5”,

3”

reels

10-1/2”

Reel

Adaptor

available

optional

accessory)

a

ll.

MEASURING

METHOD

TAPE

SPEED

DEVIATION

1.

Method

involving

use

of

pre-recorded

tape.

For

measuring

the

tape

speed

diviation,

play

back

the

pre-recorded

tape

at

1,000Hz+

0.1%.

Connect

the

appropriate

output

to

a

frequency

counter

meter

in

order

to

measure

the

tape

speed

deviation

from

the

resulting

deviation

of

the

measured

frequency.

2.

Method

involving

use

of

timing

tape.

(designed

for

tape

speed

measurement)

This

method

utilizes

a

timing

tape

marked

at

intervals

of

7-1/2”.

The

running

time

of

over

60

marked

sections

of

tape

is

measured

in

order

to

calculate

the

deviation

of

the

tape

speed.

In

applying

this

method,

however,

it

should

be

kept

in

mind

that

the

timing

tape

stretch

or

contract

measurement

enor

is

inevitable,

so

that

it is

necessary

to

measure

the

total

length

of

the

tape

in

advance.

WOW

AND

FLUTTER

Playback

the

3,000

Hz

pre-recorded

tape

of

which

the

wow

and

flutter

level

is

guaranteed

to

be

smaller

than

0.07%

for

measurement

by

means

of

a

wow

meter.

It

is

also

possible

for

a

3,000

Hz

sine

wave

to

be

recorded

and

played

for

measurement

by

means

of

the

wow

meter.

In

this

case,

however,

the

wow

meter

indicates

a

value

as

much

as

twicc

the

value

given

in

the

specifi-

cations

on

the

first

page.

FRQUENCY

RESPONSE

RECORD

:

1)

Give

a

sine

wave

of

1,000

Hz

to

the

Line

Input

of

the

recorder

to

be

tested

through

an

attenuator

from

an

audio

frequency

generator.

2)

Set

the

Record/Playback

Knob

to

“Rec”

position

and

adjust

the

line

input

volume

so

that

the

VU

Meter

needle

indicates

“O”’

VU.

3)

Set

the

Equalizer

Switch

to

7-1/2”

or

3-3/4”

position.

4)

Under

the

condition

described

in

(2),

lower

the

input

level

16

db

by

means

of

the

attenuator.

5)

Record

the

spot

frequency

in

the

range

of

30

Hz

to

25,000

Hz

from

the

audio

frequency

generator.

PLAYBACK

:

6)

Set

the

Record/Playback

Knob

to

“Play”

position.

7)

Connect

a

Vacuum

Tube

Volt

Meter

to

the

Line

Output

Jack.

(VTVM

with

milli

volt

scale.)

8)

Playback

the

reocrded

tape.

9)

Playback

the

recorded

spot

frequencies

and

make

a

memo

of

output

level

and

plot

the

value

on

a

graph.

Mic.

input

Oscillator

Microphone

Line

output

jack

TOTAL

HARMONIC

DISTORTION

FACTOR

1

KHz

Distortion

meter

Audio

Oscillator

Connect

the

measuring

instrument

as

shown

above,

and

record

the

1,000

Hz

sine

wave

at

“O”

VU.

Playback

the

resulting

signal

and

measure

the

overall

distortion

factor.

Measure

the

noise

level

of

the

tape

recorder

with

the

tape

removed

;

connect

the

audio

oscillator

directly

to

the

distortion

meter

for

measurement

of

the

distortion

factor

of

the

oscillator.

The

required

distortion

factor

may

be

obtamed

from

the

results

of

the

above

measuement

by

the

following

formula

:

do=d-di_

dz

where,

do

=

Required

d

=

Overall

distortion

factor

di

=

Noise

level

d2

=

Distortion

factor

of

the

oscillator

(Note

:

New

tape

of

particularly

good

quality

should

be

used

for

measurement

of

the

distortion

factor.)

SIGNAL

TO

NOISE

RATIO

M-10

Set the

Equalizer

Switch

to

“7-1/2

ips”

position

and

playback

a

tape

containing

a

25

Hz

sine

wave

recorded

at

“O”

VU

level

on

a

standard

recorder.

Connect

a

V.T.V.M.

to

the

line

output

jack

of

the

recordir

and

measure

its

output.

Then

remove

the

tape

and

measure

the

noise

level

under

the

same

condition.

Convert

into

decibels

each

of

the

measured

values.

CROSSTALK

(Crosstalk

between

the

tracks)

(TAPE)

Tape

direction

2

Tape

direction

As

shown

in

the

figure,

first

record

a

1,000

Hz

sine

wave

on

track

No.3

at

+3

VU

level.

Next,

remove

the

1,000

Hz

input

signal

and

record

under

a

non-input

condition.

Then,

Playback

the

tape

on

track

No.3

and

No.

1

(reversed

condition

of

tape)

through

the

1,000

Hz

B.P.F.

(Band

Pass

Filter,

Sensitivity....

1:1)

and

obtain

a

ratio

between

the

two

from

the

following

formula.

Eo

C

=

20

log

——*—

(db

eee

Bi

(db)

C

=

Desired

crosstalk

ratio

(db)

Ls

2]

Eo

=

1,000

Hz

signal

output

level

CLZLZZZ2

E2

=

1,000

Hz

crosstalk

output

level

RES

Ei

=

Non-input

signal

record

level

lll.

CONTROL

LOCATIONS

:

eNO

MH

suet)

tees.

seaveess

asecrt

rs

taurion

To

penega?

tctcres

debe,

Bo

ait

‘wonerk

Contd

eit

SEMICEARCE

faci

eBUiaL

DATE

HeRUICIRE

Te

ALi

Stee

PeaaNRL.

|

IV.

DISMANTLING

OF

TAPE

TRANSPORT

UNIT

&

AMPLIFIERS

sen

a

ee

In

case

of

trouble,

etc,

necessitating

disassembly,

please

disassemble

in

the

order

shown

in

photographs.

Remantle

in

reverse

order.

DISASSEMBLY

OF

TAPE

TRANSPORT

jai

tl

BACK

PAN

DISASSEMBLY

OF

AMPLIFIER

V.

TRANSPORT

MECANISM

4

{|

SUPPLY

3:

‘

MOTOR

"bos

fo)

t

TAPE

SPEED

SW.

re)

oO

O1OV

AGIOOVO

OH?

—e]

-»

6OHE

$

SWOO6

x

swoos

REVI

6w45W)

§

GW

2201N)

TEN(

LI

ofo

swoos

*

revi

me

Swoldd

SOHz~»

6OHZ

°

TAKE

UP.

I

id

3

i]

motor

Toe

FM

Fig.

5-1]

AC

COM,

ool

SQ>>—r

TO

FORWARD

—é

(82)

REV4

REVERSE

PLGR.

G

AClOOVO

t

”

seo

|

—£X<}H

sovenoip

—17}+

RELAY

—He—

NORMAL

CLOSED

CONTACT

——{}-—

NORMAL

OPEN

CONTACT

Fig.

5-2

1.

SUPPLY

VOLTAGE

OF

BOTH

TORQUE

2.

PINCH

ROLLER

PRESSUR

1.5

Kgr

MOTORS

DURING

RECORDING/PLAYBACK

TO

1.8

Kgr.

Recording/Playback

(Normal

Recording)

[ee

a

a

SUPPLY

Set

Recording/Playback

Knob

(A)

to

Playback

Position.

30

V

(50

to

60

gr)

The

Pinch

Roller

presses

against

Capstan

to

move

the

47

V

(100

gr)

tape

at

the

rated

speed.

The

Brake

Levers

free

the

Brake

severse

and

the

Lever

Spring

(G)

turns

‘“‘ON’’

Microswitch

60

V

(180

gr)

(SW006)

(F)

so

that

both

torque

motors

become

operative

(at

shown

in

diagram

illustration).