Akai 4400 User manual

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1

Table of contents

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STEREO

TAPE

RECORDER

movet

4400

ALSO

APPLICABLE

TO

MODEL

4400D

STEREO

TAPE

DECK

SECTION

1

SERVICE

MANUAL

SECTION

2

PARTS

LIST

SECTION

3

SCHEMATIC

DIAGRAM

..

.

U.

iH.

IV.

Vi.

VIL

SECTION

1

SERVICE

MANUAL

TABLE

OF

CONTENTS

SPECIFICATIONS

MEASURING

METHOD

1,

TAPE

SPEED

DEVIATION

2,

WOW

AND

FLUTTER

3,

FREQUENCY

RESPONSE

.

-

4,

SIGNAL

TO

NOISE

RATIO

.

5

6.

7

8

.

TOTAL

HARMONIC

DISTORTION

FACTOR

.

.

.

CROSS

TALK

(Cross

talk

between

the

tracks)

....

.

ERASE

RATIO

.

POWER

OUTPUT

(4400

only)

DISMANTLING

OF

UNIT

.....--

OPEN

REEL

MECHANISM

ADJUSTMENTS

1,

PINCH

WHEEL

ADJUSTMENT

«0.0.0...

00s

esc

e

cece

rene

ees

2,

SUPPLY

REEL

SHAFT

ASSEMBLY

ADJUSTMENT

3,

TAKE-UP

REEL

SHAFT

ASSEMBLY

ADJUSTMENT.

4,

RECORDING/PLAY

BACK

CHANGING

MECHANISM

HEAD

ADJUSTMENTS

.

.

1,

HEAD

HEIGHT

ADJUSTMENT

.

2.

HEAD

SLANT

ADJUSTMENT

..

3,

HEAD

AZIMUTH

ALIGNMENT

ADJUSTMENT

AMPLIFIER

ADJUSTMENTS

.

. . .

-

1,

PLAYBACK

LEVEL

ADJUSTMENT

.

2,

RECORDING

LEVEL

ADJUSTMENT

bp

est

3,

RECORDING

BIAS

FREQUENCY

ADJUSTMENT

........-.

4,

RECORDING

BIAS

VOLTAGE

ADJUSTMENT

(FREQUENCY

RESPONSE

ADJUSTMENT).

.

13

5,

ERASE

VOLTAGE

DC

RESISTANCE

....

i,

HEAD

DC

RESISTANCE

2,

MOTOR

DC

RESISTANCE

‘VIE.

COMPOSITE

VIEWS

OF

COMPONENTS

......----

5-2-2222

eect

e

centr

eee

ener

16

l..

SPECIFICATIONS

‘An

asterisk

next

to

a

figure

indicates

the

minimum

guaranteed

performance.

TRACK

SYSTEM

4-track

2-channel

stereo

system.

REEL

CAPACITY

Up

to

7”

zeel

TAPE

SPEED

7-1/2

and

3-3/4

ips

22%

(#3%)

WOW

AND

FLUTTER

Less

than

0.15%

(*0.22%)

RMS

at

7-1/2

ips

FREQUENCY

RESPONSE

AKAI

SRT

Tape

1

Less

than

0.20%

{*0.30%)

RMS

at

3-3/4

ips

30

to

23,000

Hz

(*40

to

22,000

Hz)

+3

dB

at

7-1/2

ips

30

to

15,080

Hz

(*40

to

13,000

Hz)

+3

dB

at

3-3/4

ips

Regular

Tape

|

30

to

20,000

Hz

(*40

to

20,000

Hz)

+3

dB

at

7-1/2

ips

30

to

13,000

Hz

("40

to

11,000

Hz)

+3

dB

at

3-3/4

ips

SIGNAL

TO

NOISE

RATIO

‘Better

than

50

dB

at

7-1/2

ips

|__Better

than

48

dB

at

3-3/4

ips

HUM

AND

NOISE

(4400

only)

"Less

than

5

mV

at

minimum

volume

DISTORTION

Less than

1.5%

(#2.0%)

at

7-1/2

ips

Less

than

2.5%

at

3-3/4

ips

CROSS

TALK

Better

than

70

dB

(*60

dB)

monaural

Better

than

50

dB

(745

aB)

stereo

ERASE

RATIO

Better

than

70

dB

INPUTS

Mic

input

|

0.8

mV

Impedance:

5

k2

Line

input

|

70

mV

Impedance:

150

k®

Din

input

|

_7mV

OUTPUTS

Line

output

|

1.228V

(4

#1

dB),

using

a

250

Hz

“O”

VU

recorded

tape

Din

output

|

0.4V

Speaker output

(4400

only)

|

16W

total

music

power

at

82

12W

(*8W)

continuous

power

at

8

BIAS

FREQUENCY,

105

kHz

£5%

BIAS

LEAK

a

Less

than

~30

VU

BIGH

FREQUENCY

DEVIATION

Within

2

dB,

using

an

8,000

Hz

3-3/4

ips

recosded

tape

at

7-1/2

ips

RECORDING

CAPACITY

60

min,

stereo

recording,

using

a

1,200

ft.

tape

at

7-1/2

ips

FAST

FORWARD

AND

REWIND

TIME

152/190

sec.,

using

a

1,200

ft.

tape

at

60/50

Hz

MOTOR

4-pole

induction

L-speed

motor

Type:

SSM-1

Revolutions:

1,800/1,500

rpm.

at

60/50

Hz

HEADS

Recording

Head

|

In-line

4-irack

2-channel

recording

head

|

Type:

P4-154

Gap:

1

micron

Impedance:

959

+15%

at

1,000

Hz

Playback

Head

|

Indine

4-track

2-channel

playback

head

Type:

PA-150

|

Gap:

1

micron

Impedance:

1,250

+15%

at

1,000

Hz

Erase

Head

|

In-line

4-track

2-channel

erase

head

Type:

£4-200

Gap:

0.6

mm

_

i

Impedance:

2002

+5%

at

100

kz

TRANSISTORS

=

2SCSSBLG(Q

(D)...6

28C97i(2)

@)

(red)...

2

2SC871(E)

()...2

28C1098(L)

(M).

ial

LD3141...4

STK-Oi1

..

.

2

(4400

only)

DIODES

a

IN34A...2

TODC-1...1

=

Wz-240...1

os

POWER

SUPPLY

100

to

240V

A.C.,

50/60

Hz

120V

A.C.,

66

Hz

for

CSA/UL

Models

220V

A.C.,

$0

Hz

for

CEE

Models

POWER

CONSUMPTION

60w

DECK:

35W

INSULATION

RESISTANCE

More

than

50

M2.

INSULATION

DURABILITY

1,000V_

A.C,

for

more

than

1

min.

duration

DIMENSIONS

406(W)

x

314(H)

x

194(D)

mm

(15.9%

«

12.4”

x

7.6")

WEIGHT

33.7

kg

(0.1

tbs.)

NOTE:

Specifications

subject

to

change

without

notice.

ll.

MEASURING

METHOD

1.

TAPE

SPEED

DEVIATION

3,

FREQUENCY

RESPONSE

i

440

4400

Frequency

Aig

ara

ae

0

Line

output

counter

requency

put

A

L

input

Line

input

Oscillator

output

Fig.

1

‘As

shown

in

Fig.

1,

connect

a

Frequency

Counter

to

the

Line’

Output

of

Model

4400.

Take

a

frequency

counter

reading

at

the

beginning,

middle,

and end

of

tape

winding

during

playback,

The

maximum

value

of

these

respective

readings

will

represent

tape

specd

deviation.

2.

WOW

AND

FLUTTER

4400

Line

output

Wow

and

Flutter

Meter

input

Method

A

As

stiown

in

Fig.

2,

connect

the

Line

Output

of

Model

4400

to

the

Input

of

a

Wow

and

Plutter

Meter.

Use

a

3,000

Hz

pre-recorded

test

tape

and

take

a

wow

and

flutter

meter

reading

at

the

begin-

ning,

middle,

and

end

of

tape

winding.

The

maximum

value

of

these

respective

readings

will

represent

the

wow

and

flutter.

Method

B

Supply

a

3,000

Hz

sine

wave

signal

from

an

Audio

Frequency

Oscillator

and

make

a

recording

on

a

blank

tape

at

the

beginning,

middle,

and

end

of

tape

winding.

Rewind

and

Playback

tape.

Measure

wow

and

flutter

with

a

Wow

and

Flutter

Meter.

{The

wow

and

flutter

value

of

Method B

will

be

close

to

twice

that

of

Method

A.)

High

Sensitivity

V.T.V.M,

Fig.

3

For

measuring

frequency

response,

connect

instru-

ments

as

shown

in

Fig.

3

and

proceed

as

follows:

1)

Supply

a

1,000

Hz

sine

wave

to

the

Line

Input

of

Model

4400

from

an

Audio

Frequency

Oscil-

lator

through

an

Attenuator.

Set

recorder

to

re-

cording

mode

and

turn

recording

level

volume

control

to

maximum.

Adjust

Attenuator

to

obtain

a

+4

dB

V.T.V.M.

reading.

2)

Under

conditions

described

in

1)

above,

re-adjust

Attenuator

so

that

the

Line

Output

is

—}@

dB,

and

record

40

to

‘20,000

Hz

spot

frequencies.

3)

Rewind

tape

and

playback

from

the

beginning.

Take

V.T.V.M.

spot

frequency

readings

and

plot

values

on

a

graph.

NOTE:

When

measuring

frequency

response,

new

tape

should

be

used.

4,

SIGNAL

TO

NOJSE

RATIO

aaa

|

4400

Line

output

High

Sensitivity

V.T.V.M.

Fig.

4

As

shown

in

Fig.

4,

connect

a

High

Sensitivity

V.T.V.M.

to

the

Line

output

of

Model

4400.

Play-

back

a

250

Hz

“0”

VU

pre-recorded

test

tape

and

measure

the

output.

Then

remove

the

tape

and

measure

the

noise

level

under

the

same

condition.

Convert

cach

of

the

measured

values

into

decibels.

5.

TOTAL

HARMONIC

DISTORTION

FACTOR

4400

Audio

Line

Frequency

ATT,

input

Line

Oscillator

output

Distortion

Meter

Fig.

5

Connect

the

measuring

instruments

as

shown

in

Fig.

5

and

record

a

1,000

Hz

sine

wave

signal

at

“0”

VU.

Playback

the

resultant

signal

and

measure

the

over-

al]

distortion

factor.

Measure

the

noise

level

of

the

tape

recorder

without

the

tape.

Connect

the

Audio

Frequency

Oscillator

directly

to

the

distortion

meter

for

measurement

of

the

distortion

factor

of

the

oscillator.

The

required

distortion

factor

can

be

obtained

from

the

results

of

the

above

measurement

by

the

following

formula:

dy

=d—d,

-

4,

where,

do

=

Required

distortion

factor

d

=

Overall

distortion

factor

”

dy

=

Noise

level

d,

=

Distortion

factor

of

the

oscillator

NOTE:

When

measuring

the

distortion

factor,

new

tape

should

be

used.

6.

CROSS

TALK

(Cross

talk

between

the

tracks)

(TAPE)

mmm

TAPE

DIRECTION

®@@O

Fig.

6

As

shown

in

Fig,

6,

first

record

a

1,000

Hz

sine

wave

signal

on

Track

No.

3

at

+3

VU

level.

Next,

record

under

a

non-input

condition.

Then,

playback

the

tape

on

Tracks

No,

3

and

4

through

the

B.P.F.

(band

pass

filter

sensitivity

.

..

1:1)

and

obtain

a

ratio

between

the

two

from

the

following

formula:

C=

200g

—

Eo

_

(ap)

2

Ey

where,

C

=

Desired

cross

talk

ratio

(dB)

E

,000

Hz

signal

cutput

level

E,

=

1,000

Hz

cross

talk

level

E,

=

Non-input

signal

recorded

level

7.

ERASE

RATIO

‘As

shown

in

Fig.

4,

connect

a

High

Sensitivity

V.T.VM,

to

the

Line

Output

of

Model

4400.

Play-

back

a

virgin

tape

and

take

a

V.T.V.M.

reading

of

the

output

level.

Next,

record

a

1,000

Hz

sine

wave

signal

at

+3

dB,

then

playback

this

recorded

signal

and

take

a

V.T.V.M.

reading

of

the

output

level.

Next,

using

this

pre-recorded

tape,

record

under

a

non-input

condition

and

take

a

reading

of

the

noise

level

output

of

the

erased

signal

and

obtain

a

ratio

between

the

two

from

the

following

formula:

Eo

=

——2___

(dB.

Er

=

20

log:

BE,

(dB)

where,

Er

=

Desired

erase

ratio

(dB)

E,=

1,000

Hz

signal

output

level

E,

=

Non-input

signal

recorded

level

E,

=

Virgin

tape

noise

output

level

8.

POWER

OUTPUT

(4400

only)

4400

82.

“High

Speaker

Sensitivity

output

V.T.V.M.

Fig.

7

As

shown

in

Fig.

7,

connect

an

8Q

dummy

load

resistor

to

the

speaker

output

of

the

recorder

and

connect

this

terminal

to

a

High

Sensitivity

V.T.V.M.

Playback

a

250

Hz

“O”

VU

pre-recorded

test

tape

and

take

a

V.T.V.M.

reading

of

the

output

level.

The

resultant

output

can

be

obtained

from

the

results

of

the

above

measurement

by

using

the

follow-

ing

formula:

=.

EB

aM)

where,

P=

Desired

power

output

(watts)

E=

Measured

voltage

(R.M.S.)

R=

82

Hl.

DISMANTLING

OF

UNIT

In

case

of

trouble,

etc.

necessitating

disassembly,

please

disassemble

in

the

order

shown

in

photographs.

Re-

assemble

in

reverse

order.

*

contro.

knoos

©

12

i

Ae

CONNECTION

PLUGS

&

SPRINGS)

|

13

SOREWS

i

ial

ne

‘

soreWs

14

Fea

&

t

SE

EO

AM®,

BLOCK

15

é

MESH

/AM®.

BLOCK

AMPLIFIER

ADJUSTSE:

Iv.

OPEN

REEL

MECHANISM

ADJUSTMENTS

1.

PINCH

WHEEL

ADJUSTMENT

It

is

important

that

the

pinch

wheel

shaft

be

kept

in

perfect

alignment

with

the

capstan

shaft.

Proper

pinch

wheel

pressure

is

between

1,000

and

1,150

grams

when

the

unit

is

operated

at

the

tape

speed

of

7-1/2

ips.

Any

deviation

from

this

specification

will

result

in

wow

and

flutter.

Check

pinch

wheel

pressure

with

a

spring

scale,

and

if

necessary,

adjust

the

pinch

wheel

load

spring.

2.

SUPPLY

REEL

SHAFT

ASSEMBLY

ADJUSTMENT

(See

Fig.

8

at

left)

Felt

clutch

material

(2)

is

used

between

the

lower

side

of

the

reel

table

base

plate

(1)

and

the

rewind

pulley

(3)

to

protect

recording

tape

from

excessive

tension

during

rewind

operation.

To

check

the

amount

of

friction

of

this

part,

install

a

S-inch

reel

with

a

60

mm

diameter

tape

and

gently

pull

the

end

of

the

tape

upward

with

a

spring

scale.

Adjust

the

conical

spring

(4)

so

that

the

amount

of

tension

is

kept

between

400

and

500

grams.

Other

felt

clutch

material

(5)

is

attached

to

the

supply

roller

(6)

to

provide

proper

slippage

during

FWD

and

REC

operation,

The

procedure

for

checking

friction

of

this

part

is

the

same

as

the

foregoing,

and

between

80

and

100

grams

of

tension

gives

best

results.

Adjust

the

spring

(7)

just

under

the

supply

roller

(6).

When

the

unit

is

set

to

fast

forward

operation,

the

amount

of

friction

will

decrease

to

from

15

to

20

grams.

Check

to

see

whether

this

is

satisfactory.

If

not,

adjust

the

spring

plate

(8)

and

the

pressure

of

the

pulley

(9).

Fig.

9

Fig.

10

z

3.

TAKE-UP

REEL

SHAFT

ASSEMBLY

ADJUSTMENT

(See

Fig.

8

at

right)

Felt

clutch

material

(2)

is

attached

to

the

bottom

side

of

the

reel

table

base

plate

(1)

so

that

the

re-

*

cording

tape

will

not

stretch

during

fast

forward

operation

due

to

excessive

tension.

To

check

the

amount

of

friction

of

this

part,

install

a

5-inch

reel

with

a

60

mm

diameter

tape,

and

gently

pull

the

end

of

tape

upward

with

a

spring

scale.

Adjust

the

conical

spring

(4)

so

that

the

amount

of

tension

at

this

part

is

kept

between

400

and

500

grams.

Other

felt

clutch

material

(10)

is

attached

to

the

take-up

roller

(11).

This

is

to

provide

proper

slippage

during

FWD

or

REC

operation,

The

procedure’

for

checking

friction

of

this

part

is

the

same

as

the

foregoing,

and

between

150

and

180

grams

of

fric-

tion

provides

the

best

results.

Adjust

the

spring

plate

(7)

just

under

the

take-up

roller

(11).

When

the

unit

is

set

to

rewind

operation,

the

amount

of

friction

of

this

part

will

decrease

to

from

15

to

20

grams.

Check

to

see

whether

this

is

satisfactory.

If

not,

adjust

the

spring

(12)

and

the

pressure

of

the

set

sleeve

(13).

4.

RECORDING/PLAYBACK

CHANGING

MECHANISM

(See

Figs.

9,

10)

Turning

the

FWD/REC

knob

(N)

to

recording

posi-

tion

causes

Lever

(a)

to

pull.

Recording

Lever

(b)

(as

illustrated

by

dotted

line),

and

the

FWD/REC

Changing

Switch

(SW-9)

is

turned

to

recording

posi-

tion.

If

Lever

(a)

does

not

pull

Lever

(b)

properly,

Changing

Switch

SW-9

will

not

operate

properly.

This

may

cause

abnormal

oscillation

and

inability

to

record.

In

this

case,

loosen

Screw

(c)

and

adjust

lever.

V.

HEAD

ADJUSTMENTS

Fig,

11

TAPE

ERASE

RECORDING

HEAD

Since

adjustment

of

the

Heads

critically

affects

tape

recorder

performance,

it is

essential

that

Heads

be

carefully

adjusted

with

precision

measuring

equip-

ment

and

suitable

recorded

tape.

1.

HEAD

HEIGHT

ADJUSTMENT

(See

Figs.

11,

12)

1)

Erase

Head

Adjust

height

control

screws

(a),

(b)

by

turning

to

left

and

right

so

that

the

upper

edge

of

the

tape

is

0.15

mm

lower

than

the

upper

edge

of

the

erase

head

core.

2)

Recording

Head

Adjust.

the

screws

(c),

(d)

by

turning

to

left

and

tight

until

the

width

between

the

upper

edge

of

channel

1

head

core

and

upper

edge

of

the

tape

is

equal.

3)

Playback

Head

Adjust

the

screws

(i),

{g)

by

turning

to

left

and

right

until

the

width

between

the

upper

edge

of

channel

1

head

core

and

upper

edge

of

the

tape

is

equal.

PLAYBACK

HEAD

Fig.

12

.

HEAD

SLANT

ADJUSTMENT

(See

Figs,

11,

12)

Adjust

the

screws

(Head

Height.

control

screws)

by

turning

to

left

and

right

so

that

each

head

(Erase,

Recording

and

Playback

Head)

contacts

the

tape

surface

at

a

right

angle.

.

HEAD

AZIMUTH

ALIGNMENT

ADJUSTMENT

(See

Figs.

11,

12)

1)

Playback

Head

Playback

an

Ampex

Alignment

test

tape

(8.000

Hz

3-3/4

ips.)

al

7-1/2

ips.

Adjust

screw

(h)

by

turning

to

feft

and

tight

until

the

various

line

outputs

are

maximum.

2)

Recording

Head

At

recording

mode,

supply

a

15,000

Hz

sine

wave

at

a

—16

dB

recording

level

from

an

Audio

Fre-

quency

Oscillator

to

the

line-input

of

the

4400,

and

set

the

Monitor

switch

to

“TAPE”

position.

Then

adjust

screw

(e)

by

turning

to

left

and

right

until

the

various

Hine

outputs

are

maximum.

4.

Repeat

adjustments

outlined

in

Items

1—2)

to

3,

above

2

or

3

times

to

obtain

optimum

adjusted

condition.

10