Akai 4400 Manual de usuario

STEREO

TAPE

RECORDER

movet

4400

ALSO

APPLICABLE

MODEL

4400D

STEREO

TAPE

DECK

SECTION

SERVICE

MANUAL

SECTION

PARTS

LIST

SECTION

SCHEMATIC

DIAGRAM

iH.

IV.

Vi.

VIL

SECTION

SERVICE

MANUAL

TABLE

CONTENTS

SPECIFICATIONS

MEASURING

METHOD

TAPE

SPEED

DEVIATION

WOW

AND

FLUTTER

FREQUENCY

RESPONSE

SIGNAL

NOISE

RATIO

TOTAL

HARMONIC

DISTORTION

FACTOR

CROSS

TALK

(Cross

talk

between

the

tracks)

....

ERASE

RATIO

POWER

OUTPUT

(4400

only)

DISMANTLING

UNIT

.....--

OPEN

REEL

MECHANISM

ADJUSTMENTS

PINCH

WHEEL

ADJUSTMENT

«0.0.0...

00s

esc

cece

rene

ees

SUPPLY

REEL

SHAFT

ASSEMBLY

ADJUSTMENT

TAKE-UP

REEL

SHAFT

ASSEMBLY

ADJUSTMENT.

RECORDING/PLAY

BACK

CHANGING

MECHANISM

HEAD

ADJUSTMENTS

HEAD

HEIGHT

ADJUSTMENT

HEAD

SLANT

ADJUSTMENT

HEAD

AZIMUTH

ALIGNMENT

ADJUSTMENT

AMPLIFIER

ADJUSTMENTS

. . .

PLAYBACK

LEVEL

ADJUSTMENT

RECORDING

LEVEL

ADJUSTMENT

est

RECORDING

BIAS

FREQUENCY

ADJUSTMENT

........-.

RECORDING

BIAS

VOLTAGE

ADJUSTMENT

(FREQUENCY

RESPONSE

ADJUSTMENT).

ERASE

VOLTAGE

RESISTANCE

....

HEAD

RESISTANCE

MOTOR

RESISTANCE

‘VIE.

COMPOSITE

VIEWS

COMPONENTS

......----

5-2-2222

eect

centr

eee

ener

l..

SPECIFICATIONS

‘An

asterisk

figure

indicates

the

minimum

guaranteed

performance.

TRACK

SYSTEM

4-track

2-channel

stereo

system.

REEL

CAPACITY

7”

zeel

TAPE

SPEED

7-1/2

and

3-3/4

ips

22%

(#3%)

WOW

AND

FLUTTER

Less

than

0.15%

(*0.22%)

RMS

7-1/2

ips

FREQUENCY

RESPONSE

AKAI

SRT

Tape

Less

than

0.20%

{*0.30%)

RMS

3-3/4

ips

23,000

(*40

22,000

Hz)

7-1/2

ips

15,080

(*40

13,000

Hz)

3-3/4

ips

Regular

Tape

20,000

(*40

20,000

Hz)

7-1/2

ips

13,000

("40

11,000

Hz)

3-3/4

ips

SIGNAL

NOISE

RATIO

‘Better

than

7-1/2

ips

|__Better

than

3-3/4

ips

HUM

AND

NOISE

(4400

only)

"Less

than

minimum

volume

DISTORTION

Less than

1.5%

(#2.0%)

7-1/2

ips

Less

than

2.5%

3-3/4

ips

CROSS

TALK

Better

than

(*60

dB)

monaural

Better

than

(745

aB)

stereo

ERASE

RATIO

Better

than

INPUTS

Mic

input

0.8

Impedance:

Line

input

Impedance:

150

k®

Din

input

_7mV

OUTPUTS

Line

output

1.228V

dB),

using

250

“O”

recorded

tape

Din

output

0.4V

Speaker output

(4400

only)

16W

total

music

power

12W

(*8W)

continuous

power

BIAS

FREQUENCY,

105

kHz

£5%

BIAS

LEAK

Less

than

~30

BIGH

FREQUENCY

DEVIATION

Within

dB,

using

8,000

3-3/4

ips

recosded

tape

7-1/2

ips

RECORDING

CAPACITY

min,

stereo

recording,

using

1,200

ft.

tape

7-1/2

ips

FAST

FORWARD

AND

REWIND

TIME

152/190

sec.,

using

1,200

ft.

tape

60/50

MOTOR

4-pole

induction

L-speed

motor

Type:

SSM-1

Revolutions:

1,800/1,500

rpm.

60/50

HEADS

Recording

Head

In-line

4-irack

2-channel

recording

head

Type:

P4-154

Gap:

micron

Impedance:

959

+15%

1,000

Playback

Head

Indine

4-track

2-channel

playback

head

Type:

PA-150

Gap:

micron

Impedance:

1,250

+15%

1,000

Erase

Head

In-line

4-track

2-channel

erase

head

Type:

£4-200

Gap:

0.6

Impedance:

2002

+5%

100

TRANSISTORS

2SCSSBLG(Q

(D)...6

28C97i(2)

(red)...

2SC871(E)

()...2

28C1098(L)

(M).

ial

LD3141...4

STK-Oi1

(4400

only)

DIODES

IN34A...2

TODC-1...1

Wz-240...1

POWER

SUPPLY

100

240V

A.C.,

50/60

120V

A.C.,

for

CSA/UL

Models

220V

A.C.,

for

CEE

Models

POWER

CONSUMPTION

60w

DECK:

35W

INSULATION

RESISTANCE

than

M2.

INSULATION

DURABILITY

1,000V_

A.C,

for

than

min.

duration

DIMENSIONS

406(W)

314(H)

194(D)

(15.9%

12.4”

7.6")

WEIGHT

33.7

(0.1

tbs.)

NOTE:

Specifications

subject

change

without

notice.

ll.

MEASURING

METHOD

TAPE

SPEED

DEVIATION

FREQUENCY

RESPONSE

440

4400

Frequency

Aig

ara

Line

output

counter

requency

put

input

Line

input

Oscillator

output

Fig.

‘As

shown

Fig.

connect

Frequency

Counter

the

Line’

Output

Model

4400.

Take

frequency

counter

reading

the

beginning,

middle,

and end

tape

winding

during

playback,

The

maximum

value

these

respective

readings

will

represent

tape

specd

deviation.

WOW

AND

FLUTTER

4400

Line

output

Wow

and

Flutter

Meter

input

Method

stiown

Fig.

connect

the

Line

Output

Model

4400

the

Input

Wow

and

Plutter

Meter.

Use

3,000

pre-recorded

test

tape

and

take

wow

and

flutter

meter

reading

the

begin-

ning,

middle,

and

end

tape

winding.

The

maximum

value

these

respective

readings

will

represent

the

wow

and

flutter.

Method

Supply

3,000

sine

wave

signal

from

Audio

Frequency

Oscillator

and

make

recording

blank

tape

the

beginning,

middle,

and

end

tape

winding.

Rewind

and

Playback

tape.

Measure

wow

and

flutter

with

Wow

and

Flutter

Meter.

{The

wow

and

flutter

value

Method B

will

twice

that

Method

A.)

High

Sensitivity

V.T.V.M,

Fig.

For

measuring

frequency

response,

connect

instru-

ments

shown

Fig.

and

proceed

follows:

Supply

1,000

sine

wave

the

Line

Input

Model

4400

from

Audio

Frequency

Oscil-

lator

through

Attenuator.

Set

recorder

re-

cording

mode

and

turn

recording

level

volume

control

maximum.

Adjust

Attenuator

obtain

V.T.V.M.

reading.

Under

conditions

described

above,

re-adjust

Attenuator

that

the

Line

Output

—}@

dB,

and

record

‘20,000

spot

frequencies.

Rewind

tape

and

playback

from

the

beginning.

Take

V.T.V.M.

spot

frequency

readings

and

plot

values

graph.

NOTE:

When

measuring

frequency

response,

new

tape

should

used.

SIGNAL

NOJSE

RATIO

aaa

4400

Line

output

High

Sensitivity

V.T.V.M.

Fig.

shown

Fig.

connect

High

Sensitivity

V.T.V.M.

the

Line

output

Model

4400.

Play-

back

250

“0”

pre-recorded

test

tape

and

measure

the

output.

Then

remove

the

tape

and

measure

the

noise

level

under

the

same

condition.

Convert

cach

the

measured

values

into

decibels.

TOTAL

HARMONIC

DISTORTION

FACTOR

4400

Audio

Line

Frequency

ATT,

input

Line

Oscillator

output

Distortion

Meter

Fig.

Connect

the

measuring

instruments

shown

Fig.

and

record

1,000

sine

wave

signal

“0”

VU.

Playback

the

resultant

signal

and

measure

the

over-

al]

distortion

factor.

Measure

the

noise

level

the

tape

recorder

without

the

tape.

Connect

the

Audio

Frequency

Oscillator

directly

the

distortion

meter

for

measurement

the

distortion

factor

the

oscillator.

The

required

distortion

factor

can

obtained

from

the

results

the

above

measurement

the

following

formula:

=d—d,

where,

Required

distortion

factor

Overall

distortion

factor

”

Noise

level

Distortion

factor

the

oscillator

NOTE:

When

measuring

the

distortion

factor,

new

tape

should

used.

CROSS

TALK

(Cross

talk

between

the

tracks)

(TAPE)

mmm

TAPE

DIRECTION

®@@O

Fig.

shown

Fig,

first

record

1,000

sine

wave

signal

Track

No.

level.

Next,

record

under

non-input

condition.

Then,

playback

the

tape

Tracks

No,

and

through

the

B.P.F.

(band

pass

filter

sensitivity

1:1)

and

obtain

ratio

between

the

two

from

the

following

formula:

200g

—

(ap)

where,

Desired

cross

talk

ratio

(dB)

,000

signal

cutput

level

1,000

cross

talk

level

Non-input

signal

recorded

level

ERASE

RATIO

‘As

shown

Fig.

connect

High

Sensitivity

V.T.VM,

the

Line

Output

Model

4400.

Play-

back

virgin

tape

and

take

V.T.V.M.

reading

the

output

level.

Next,

record

1,000

sine

wave

signal

dB,

then

playback

this

recorded

signal

and

take

V.T.V.M.

reading

the

output

level.

Next,

using

this

pre-recorded

tape,

record

under

non-input

condition

and

take

reading

the

noise

level

output

the

erased

signal

and

obtain

ratio

between

the

two

from

the

following

formula:

——2___

(dB.

log:

BE,

(dB)

where,

Desired

erase

ratio

(dB)

E,=

1,000

signal

output

level

Non-input

signal

recorded

level

Virgin

tape

noise

output

level

POWER

OUTPUT

(4400

only)

4400

82.

“High

Speaker

Sensitivity

output

V.T.V.M.

Fig.

shown

Fig.

connect

dummy

load

resistor

the

speaker

output

the

recorder

and

connect

this

terminal

High

Sensitivity

V.T.V.M.

Playback

250

“O”

pre-recorded

test

tape

and

take

V.T.V.M.

reading

the

output

level.

The

resultant

output

can

obtained

from

the

results

the

above

measurement

using

the

follow-

ing

formula:

aM)

where,

Desired

power

output

(watts)

Measured

voltage

(R.M.S.)

Hl.

DISMANTLING

UNIT

case

trouble,

etc.

necessitating

disassembly,

please

disassemble

the

order

shown

photographs.

Re-

assemble

reverse

order.

contro.

knoos

CONNECTION

PLUGS

SPRINGS)

SOREWS

ial

‘

soreWs

Fea

AM®,

BLOCK

MESH

/AM®.

BLOCK

AMPLIFIER

ADJUSTSE:

Iv.

OPEN

REEL

MECHANISM

ADJUSTMENTS

PINCH

WHEEL

ADJUSTMENT

important

that

the

pinch

wheel

shaft

kept

perfect

alignment

with

the

capstan

shaft.

Proper

pinch

wheel

pressure

between

1,000

and

1,150

grams

when

the

unit

operated

the

tape

speed

7-1/2

ips.

Any

deviation

from

this

specification

will

result

wow

and

flutter.

Check

pinch

wheel

pressure

with

spring

scale,

and

necessary,

adjust

the

pinch

wheel

load

spring.

SUPPLY

REEL

SHAFT

ASSEMBLY

ADJUSTMENT

(See

Fig.

left)

Felt

clutch

material

(2)

used

between

the

lower

side

the

reel

table

base

plate

(1)

and

the

rewind

pulley

(3)

protect

recording

tape

from

excessive

tension

during

rewind

operation.

check

the

amount

friction

this

part,

install

S-inch

reel

with

diameter

tape

and

gently

pull

the

end

the

tape

upward

with

spring

scale.

Adjust

the

conical

spring

(4)

that

the

amount

tension

kept

between

400

and

500

grams.

Other

felt

clutch

material

(5)

attached

the

supply

roller

(6)

provide

proper

slippage

during

FWD

and

REC

operation,

The

procedure

for

checking

friction

this

part

the

same

the

foregoing,

and

between

and

100

grams

tension

gives

best

results.

Adjust

the

spring

(7)

just

under

the

supply

roller

(6).

When

the

unit

set

fast

forward

operation,

the

amount

friction

will

decrease

from

grams.

Check

see

whether

this

satisfactory.

not,

adjust

the

spring

plate

(8)

and

the

pressure

the

pulley

(9).

Fig.

TAKE-UP

REEL

SHAFT

ASSEMBLY

ADJUSTMENT

(See

Fig.

right)

Felt

clutch

material

(2)

attached

the

bottom

side

the

reel

table

base

plate

(1)

that

the

re-

cording

tape

will

not

stretch

during

fast

forward

operation

due

excessive

tension.

check

the

amount

friction

this

part,

install

5-inch

reel

with

diameter

tape,

and

gently

pull

the

end

tape

upward

with

spring

scale.

Adjust

the

conical

spring

(4)

that

the

amount

tension

this

part

kept

between

400

and

500

grams.

Other

felt

clutch

material

(10)

attached

the

take-up

roller

(11).

This

provide

proper

slippage

during

FWD

REC

operation,

The

procedure’

for

checking

friction

this

part

the

same

the

foregoing,

and

between

150

and

180

grams

fric-

tion

provides

the

best

results.

Adjust

the

spring

plate

(7)

just

under

the

take-up

roller

(11).

When

the

unit

set

rewind

operation,

the

amount

friction

this

part

will

decrease

from

grams.

Check

see

whether

this

satisfactory.

not,

adjust

the

spring

(12)

and

the

pressure

the

set

sleeve

(13).

RECORDING/PLAYBACK

CHANGING

MECHANISM

(See

Figs.

10)

Turning

the

FWD/REC

knob

(N)

recording

posi-

tion

causes

Lever

(a)

pull.

Recording

Lever

(b)

(as

illustrated

dotted

line),

and

the

FWD/REC

Changing

Switch

(SW-9)

turned

recording

posi-

tion.

Lever

(a)

does

not

pull

Lever

(b)

properly,

Changing

Switch

SW-9

will

not

operate

properly.

This

may

cause

abnormal

oscillation

and

inability

record.

this

case,

loosen

Screw

(c)

and

adjust

lever.

HEAD

ADJUSTMENTS

Fig,

TAPE

ERASE

RECORDING

HEAD

Since

adjustment

the

Heads

critically

affects

tape

recorder

performance,

it is

essential

that

Heads

carefully

adjusted

with

precision

measuring

equip-

ment

and

suitable

recorded

tape.

HEAD

HEIGHT

ADJUSTMENT

(See

Figs.

11,

12)

Erase

Head

Adjust

height

control

screws

(a),

(b)

turning

left

and

right

that

the

upper

edge

the

tape

0.15

lower

than

the

upper

edge

the

erase

head

core.

Recording

Head

Adjust.

the

screws

(c),

(d)

turning

left

and

tight

until

the

width

between

the

upper

edge

channel

head

core

and

upper

edge

the

tape

equal.

Playback

Head

Adjust

the

screws

(i),

{g)

turning

left

and

right

until

the

width

between

the

upper

edge

channel

head

core

and

upper

edge

the

tape

equal.

PLAYBACK

HEAD

Fig.

HEAD

SLANT

ADJUSTMENT

(See

Figs,

11,

12)

Adjust

the

screws

(Head

Height.

control

screws)

turning

left

and

right

that

each

head

(Erase,

Recording

and

Playback

Head)

contacts

the

tape

surface

right

angle.

HEAD

AZIMUTH

ALIGNMENT

ADJUSTMENT

(See

Figs.

11,

12)

Playback

Head

Playback

Ampex

Alignment

test

tape

(8.000

3-3/4

ips.)

7-1/2

ips.

Adjust

screw

(h)

turning

feft

and

tight

until

the

various

line

outputs

are

maximum.

Recording

Head

recording

mode,

supply

15,000

sine

wave

—16

recording

level

from

Audio

Fre-

quency

Oscillator

the

line-input

the

4400,

and

set

the

Monitor

switch

“TAPE”

position.

Then

adjust

screw

(e)

turning

left

and

right

until

the

various

Hine

outputs

are

maximum.

Repeat

adjustments

outlined

Items

1—2)

above

times

obtain

optimum

adjusted

condition.

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