Akai 1730-SS Manuel utilisateur

Autres manuels pour 1730-SS

1

Table des matières

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TABLE

OF

CONTENTS

SPECIFICATIONS

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MEASURING

METHODS

................00.-0000-

3

CONTROL

LOCATIONS

....

20.0.2...

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5

DISMANTLING

OF

TAPE

TRANSPORT

UNIT

6c

AMPLIPIERS

202s

ae

oes

eae

deed

sone

ee

coed

darade

6

TRANSPORT MECHANISM

........00...0..2-02000-

8

MECHANISM

ADJUSTMENT

............-2..0200005

12

AMPLIFIER

ADJUSTMENT

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

14

MAINTENANCE

PROCEDURES

..............2005.

16

TROUBLE

SHOOTING

CHART

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

17

COMPOSITE

VIEWS

OF

COMPONENTS

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

22

SCHEMATIC

DIAGRAM

When

placing

order

for

parts,

please

use

Separate

PARTS

LIST

or

PRICE

LIST

FOR

PARTS.

I.

SPECIFICATIONS

WEIGHT

DIMENSIONS

37.5

Ibs.

(17.0

kg)

18"(H)

x

16.5’°(W)

x

9.5'(D)

(H450

x

W420

x

D240

mm)

POWER

SUPPLY

100

to

240

V

AC,

50/60

Hz

RECORDING

SYSTEM

In-line

4-track

4-channel

stereo

and

4-track

2-channel

stereo

recording

PLAYBACK

SYSTEM

In-line

4-track

4-channel

stereo

and

4-track

2-channel

stereo

playback

POWER

CON-

SUMPTION

80

W

(Deck

55

W)

TAPE

SPEED

3-3/4,

7-1/2

ips.

TAPE

SPEED

DEVIATION

Within

+1.5%

at

all

speeds.

WOW

AND

FLUTTER

Less

than

0.15%

R.M.S.

at

7-1/2”

Less than

0.2%

R.M.S.

at

3-3/4"

FREQUENCY

RESPONSE

30

to

22,000

Hz

+3

dB

at

7-1/2”

40

to

13,000

Hz

+3

dB

at

3-3/4”

SIGNAL

TO

NOISE

RATIO

More

than

48

dB

DISTORTION

(Total

Harmonics)

Within

2%

at

1,000

Hz

OVU

recording

(LINE

OUTPUT)

Within

3%

at

1,000

Hz

5

W

(when

terminated

with

82)

(MAIN

OUTPUT)

CROSS-TALK

Less than

—SO

dB

(track)

Less

than

—40

dB

(channel)

ERASE

RATIO

Less

than

70

dB

INSULATION

RESISTANCE

More

than

50

MQ

INSULATION

DURABILITY

1,000

V

AC

for

more

than

one

minute

duration

LINE

OUTPUT

+4

dB

41.5

dB

(1.228

V),

at

OVU

indi-

cation,

250

Hz

OVU

recorded

tape

Required

load

impedance

more

than

25K

More

than

5

W

Impedance

;

8

2

—6

dB

+1.5dB

when

using

a

250

Hz

recorded

tape

POWER

OUTPUT

DIN

OUTPUT

Required

load

impedance

more

than

50

KQ

Above

40

mV

Impedance

;

330

KQ

Above

0.4

mV

Impedance

;

30

KQ

Above

20

mV

Impedance

;

100

KQ

LINE

INPUT

MIC.

INPUT

DIN

INPUT

FAST

FORWARD

&

REWIND

TIME

MONITOR

SYSTEM

(recording)

MOTOR

HEADS

RECORDING

HEAD

PLAYBACK

HEAD

ERASE

HEAD

ERASE

HEAD

TRANSITORS

&

IC

USED

DIODES

REELS

90

seconds

1,200

ft.

tape

at

50

Hz

70

seconds

1,200

ft.

tape

at

60

Hz

With

Record/Play

back

Switch

at

“REC”

The

program

being

recorded

can

be

monitored

by

using

:

built-in

speakers

stereo

headphones

external

speakers

crystal

receiver

Hysteresis

synchronous

2

speed

motor

Horse

Power:

1/100

HP

Power

Ratio:

85%

Revolutions

:

3,000

to

1,500

R.P.M.

at

50

Hz

3,600

to

1,800

R.P.M.

at

60

Hz

Condenser

capacity

:

3

uF

at

50

Hz

2

pF

at

60

Hz

In-line

4-track

4-channel

stereo

(4-track

2-channel

stereo)

Impedance

:

125

420%

at

1,000

Hz

Gap:

4/1,000

mm

In-line

4-track

4-channel

stereo

(4-track

2-channel

stereo)

Impedance

:

1,200

2

+15%

at

1,000

Hz

Gap

:

2/1,000

mm

In-line

4-track

2-channel

stereo

Impedance:

195

2

+10%

at

100

KHz

In-line

Full

track

Impedance

:

350

2

+10%

at

100

KHz

2SC458LG

(C)

x

4

|

apCURDING

28C871

(E,F)

x4

|

AMPLIFIER

LD-3141

x

4

}

2SC458LG

(C)

x

8|

PLAYBACK

LD-3141

x

4

|

AMPLIFIER

STK-011(A)

x2

MAIN

AMPLIFIER

2SC971

(2,3)

(RED)

x2

BIAS

OSC.

2SD223

(Y)x

1

POWER

AMP.

IN34A

x4

VO6B

x

4

10DC-1

(BLACK)

x

1

RD-24A

(M)

x

1

7'',

5"

reels

can

be

used.

lil.

MEASURING

METHOD

TAPE

SPEED

DEVIATION

1.

Method

involving

use

of

pre-recorded

tape

Playback

a

tape

pre-recorded

at

1000

Hz

(+0.1%)

on

recorder

to

be

tested.

Connect

the

appropriate

output

to

a

frequency

counter

meter

in

order

to

measure

the

tape

speed

deviation.

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

timing

tape

stretch

or

contract

measure-

ment

error

is

inevitable,

so

that

it is

necessary

to

measure

the

total

length

of

the

tape

in

advance.

WOW

AND

FLUTTER

Playback

a

3,000

Hz

pre-recorded

tape,

of

which

the

wow

and

flutter

level

is

guaranteed

to

be

smaller

than

0.07%,

and

measure

with

a

wow

meter.

It

is

also

possible

for

a

3,000

Hz

sine

wave

to

be

recorded

and

played

back

for

measurement

with

a

wow

meter.

In

this

case,

however,

the

wow

meter

will

indicate

a

value

as

much

as

twice

that

given

in

the

specifications.

SIGNAL

TO

NOISE

RATIO

1730-SS

ae

=

atv

Set

the

Equalizer

Switch

to

the

“7-1/2

ips”

position

and

playback

a

tape

containing

a

250

Hz

sine

wave

recorded

at

“Q’

VU

level

on

a

standard

recorder.

Connect

a

V.T.V.M.

to

the

line

output

jack

of

the

recorder

and

measure

its

output.

Next,

remove

the

tape

and

measure

the

noise

level

under

the

same

conditions.

Convert

each

of

the

measured

values

into

decibels.

TOTAL

HARMONIC

DISTORTION

FACTOR

1

KHz

Audio

1730-SS

Distortion

Oscillator

meter

Connect

the

measuring

instruments

as

shown

above,

and

record

a

1,000

Hz

sine

wave

at

“0”

VU.

Playback

the

resultant

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

resultant

distortion

factor

can

be

obtained

from

the

results

of

the

above

measurement

by

using

the

following

formula

:

do

=

d—d,

—d2

where,

do

=

Required

d

=

Overall

distortion

factor

d,;

=

Noise

level

d2

=

Distortion

factor

of

the

oscillator

(Note

:

New

tape

of

particularly

good

quality

should

be

used

for

measurement

of

the

distortion

factor.

Fuji

L

is

recommended).

POWER

OUTPUT

Playback

a

tape

containing

a

sine

wave

of

250

Hz

recorded

at

“0”

VU

ona

standard

recorder.

Measure

the

Voltage

at

the

output

of

the

recorderto

be

tested

when

terminated

with

8

Q..

Then

use

the

following

formula

:

By

P

=

Desired

output

(W)

P=

E

=

Measured

Voltage

(R.M.S.)

R=8Q2

CROSS

TALK

1.

Between

the

tracks

(2

Channel)

(TAPE)

ZENG

BKC

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

tracks

3

and

1

(reversed

condition

of

tape)

through

the

1,000

Hz

B.P.F.

(Band

Pass

Filter,

Sensitivity

...

1:

1)

and

obtain

the

ratio

between

the

two

by

using

the

following

formula.

C

=

20

log?

(AB)

2°c=

1

C=

Desired

cross

talk

ratio

(dB)

Eo

=

1,000

Hz

signal

output

level

BES

E2

=

1,000

Hz

cross

talk

output

level

E,

=

Non-input

signal

record

level

CERRY

2.

Between

the

channels

(4

Channel)

Tape

direction

©)

As

shown

in

the

figure,

first

record

a

1,000

Hz

sine

wave

on

track

No.1

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.1

and

No.

2

through

the

1,000

Hz

B.P.F.

(Band

Pass

Filter,

Sensiti-

vity

...

1:1)

and

obtain

a

ratio

between

the

two

from

the

following

formula.

E

C

=

20

log

=

(dB)

2

I

C=

Desired

cross-talk

ratio

(dB)

Eo

=

1,000

Hz

signal

output

level

fest

|

E,

=

1,000

Hz

cross-talk

output

level

CLA

E,

=

No-input

signal

record

level

RES

Tape

direction

FREQUENCY

RESPONSE

Audio

1730-SS

Oscillator

Input

Output

Connect

the

measuring

instruments

as

shown

in

the

above

diagram,

and

measure

the

frequency

response

in

the

following

sequence

:

RECORD

:

1)

Introduce

a

sine

wave

of

1,000

Hz

to

the

Line

Input

of

the

recorder

being

tested

through

an

attenuator

from

an

audio

frequency

generator.

2)

Set

the

Record/Playback

Lever

to

‘‘Rec”

position

and

adjust

the

line

input

volume

so

that

the

VU

meter

needle

indicates

“0”

VU.

3)

Under

the

conditions

described

in

(2),

lower

the

input

level

20

dB

with

the

attenuator.

4)

Record

the

spot

frequency

from

the

audio

fre-

quency

generator

in

the

range

of

30

to

23,000

Hz.

PLAYBACK

:

5)

Set

the

Record/Playback

Lever

to

“Play”

position.

6)

Connect

a

V.T.V.M.

to

the

Line

Output.

7)

Playback

the

previously

recorded

tape.

8)

Adjust

the

output

level

to

“0”

dBm

at

1,000

Hz

(indicated

on

range

selector

of

V.T.V.M.).

9)

Playback

the

recorded

spot

frequencies

under

the

conditions

in

(8);

make

a

memo

of

Output

Level

and

plot

the

value

ona

graph.

(Note

:

New

tape

of

particularly

good

quality

should

be

used

for

measurement

of

the

frequency

response.

Fuji

F

tape

is

recommended).

In

case

of

trouble,

etc.

necessitating

disassembly,

pleas

disassemble

in

the

order

shown

in

photographs.

Reas-

semble

in

reverse

order.

lil.

CONTROL

LOCATIONS

RESET

BUTTON

INDEX

COUNTER

TAKE-UP

REEL

TABLE

REEL

RETAINER

——~~—

AUTOMATIC

SHUT-OFF

LEVER

PLAY/RECORD

LEVER

~—-REWIND/FAST

FORWARD

LEVER

PAUSE

LEVER

SUPPLY

REEL

TABLE

REEL

RETAINER

PINCH

WHEEL

CAPSTAN

CYCLE

CONVERSION

SWITCH

{A}

HEAD

COVER

HEADPHONE

JACK

‘Front?

HEADPHONE

‘JACK

‘Rear’

RECORD

SAFETY

BUTTON

VU

METER

(Right)

VU

METER

(Left}

TAPE

SPEED

SELECTOR

RECORDING

LEVEL

CONTROL

(Left)

RECORDING

LEVEL

CONTROL(Right)

MICROPHONE

JACK

(Left)

MICROPHONE

JACK

(Right)

MONITOR

SWITCHES

AUTOMATIC

SHUT-OFF

SWITCH

POWER

SWITCH

RECORDING

LEVEL

CONTROL

{Left}

RECORDING

LEVEL

CONTROL

(Right)

SPEAKER

VOLUME

CONTROL

STEREO

SELECTOR

MICROPHONE

JACK

(Right)

MICROPHONE

JACK

(Left)

VU

METER

[Right)

VU

METER

(Left)

AC

CORD

VOLTAGE

SELECTOR

PLUG

FUSE

POST

CYCLE

CONVERSION

SWITCH

(B)

SPEAKER

SWITCH

LINE

OUTPUT

JACK

(Right)

DIN

JACK

(Front)

LINE

OUTPUT

JACK

(Left)

LINE

INPUT

JACK

(Left)

LINE

INPUT

JACK

(Right)

SPEAKER

JACKS

(Left.

Right)

LINE

OUTPUT

JACK

(Left)

LINE

OUTPUT

JACK

(Right)

LINE

INPUT

JACK

(Right)

DIN

JACK

(Rear!

LINE

INPUT

JACK

(Left)

IV.

DISMANTLING

OF

TAPE

TRANSPORT

UNIT

&

AMPLIFIERS

In

case

of

trouble,

etc,

necessitating

disassembly,

please

disassemble

in

the

order

shown

in

photographs.

Reas-

semble

in

reverse

order.

EAY,

REC.-LE'

Le

RWOMLEVER

>

"MECH.

AMP.

BLOCK

|

CASE

BLOCK

(ei)

4

we)

WI)

£

12

RETAINING

PLATE

V.

TRANSPORT

MECHANISM

Fig.

1

Braked

Rotation

1.

CAPSTAN

DRIVE

Figure

1.

(A)

Motor

(B)

Drive

Belt

(flat

belt)

(C)

Capstan

(D)

Flywheei

High-speed

rotation

of

Motor

(A)

is

transmitted

by

Drive

Belt

(B)

to

Capstan

(C);

which

is

connected

to

a

flywheel

that

provides

necessary

inertia.

This

flywheel

maintains

the

rated

rotation

and

absorbs

minor

rotation

variations

of

the

motor.

Capstan

Rotation

:

606

R.P.M.

at

7-1/2”

(19

cm)

per

sec.

303

R.P.M.

at

3-3/4”

(9.5

cm)

per

sec.

151.5

R.P.M.

at

1-7/8"

(4.75

cm)

per

sec.

Motor

Rotation

:

3,000

to

1,500

R.P.M.

at

50

Hz

3,600

to

1,800

R.P.M.

at

60

Hz

2.

PINCH

WHEEL

DRIVE

The

pressure

of

the

pinch

wheel

as

it

pushes

against

capstan,

transports

tape

between

rotating

capstan

and

pinch

wheel

at

the

rated

speed.

The

proper

pinch

wheel

pressure

is

between

1,000

to

1,150

grams

at

the

tape

speed

of

7-1/2’

(19

cm)

per

second.

3.

RECORD

AND

PLAYBACK

MECHANISM

Turning

the

RECORD/PLAYBACK

LEVER

(A)

to

“PLAY”

position

causes

the

pinch

wheel

to

press

against

the

capstan

and

move

the

tape

at

the

rated

speed.

At

the

same

time,

Idler

(B)

moves

between

Motor

Bushing

(C)

and

the

Take-Up

Reel

Spindle

(D)

to

transmit

the

motor

rotation

to

(D)

so

that

the

tape

is

moved

and

wound

on

the

take-up

reel.

The

Take-up

Reel

Spindle

Base,

composed

of

two

plastic

wheels

(discs)

(1

and

2)

witha

felt

clutch

between,

is

rotated

from

below

by

the

idler.

Tape-winding

friction

is

adjusted

by

the

slipping

of

the

felt

and

maintains

rated

winding

of

the

tape.

The

Supply

Reel

Spindle

(H)

hasa

Brake

Roller

(E)

contacting

plastic

wheel

(disc)

(4)

from

below

which

provides

appropriate

back

tension

by

the

slipping

of

the

felt

clutch

to

the

rotation

of

the

Pulley

(3)

above.

To

prevent

accidental

erasure,

the

Record

Safety

Button

(F)

must

be

depressed

before

the

RECORD/PLAYBACK

LEVER

can

_

be

moved

to

the

“REC”

position.

Safety

device

(G)

is

depressed

to

operate

the

recording

mechanism.

(See

figure

2)

4.

FAST-FORWARD

MECHANISM

Turning

the

FAST

FWD-REWIND

LEVER

(A)

to

“FAST

FWD”

position,

causes

cam

(B)

under

the

knob

to

push

up

Lever

(C).

Idler

(D)

moves

into

the

space

between

Plastic

Roller

(F)

above

the

Take-Up

Reel

Spindle

and

the

upper

part

of

the

rotating

motor

drive

bushing

to

transmit

the

motor

rotation

to

the

take-up

reel

spindle.

At

the

same

time,

Brake

Rollers

(H)

and

(I)

come

off

the

reel

spindle

to

free

Supply

Reel

Spindles

(G)

and

(F),

thereby

allowing

fast

winding

of

the

tape

onto

the

take-up

reel.

(See

figure

3)

5.

REWIND

MECHANISM

nee

Turning

the

FAST

FWD-REWIND

knob

(A)

to

“REWIND”

position,

causes

cam

(B)

under

the

knob

to

push

up

Lever

(C).

Idler

(D)

moves

into

the

space

between

the

upper

part

of

the

rotating

Motor

drive

bushing

(E)

and

the

Intermediate

Pulley

(F)

to

transmit

the

high-speed

rotation

of

the

motor

through

the

intermediate

pulley

to

Supply

Reel

Spindle

(G).

At

the

same

time,

Brake

Rollers

(H)

and

(I)

come

off

the

reel

spindle

to

free

take-up

reel

spindles

(J)

and

(G),

thereby

rewinding

the

tape

onto

the

supply

reel

at

a

fast

speed.

(See

figure

4)

6.

STOP

CONTROL

Turning

the

stop

lever

to

“STOP”

position,

causes

Brake

Rollers

(A)

and

(B)

to

depress

the

reel

spindles

andstop

rotation.

ie

~P

take-up

Reel

Sendie’

Ba

ier

Ax

/F7w

°

As

the

brake

rubbers

depress

the

plastic

rollers

below

the

a

‘

reel

spindles,

no

friction

is

applied

to

the

tape.

(See

figure

5)

=

Pinch

|

ake-up

|

Rewind

|

Take-up

|

Swp

ly

Modes

of

Operation

Wheel

Idler

Idler

side

ide

Wheel

Wheel

Brake

Buk

€

=

aie

STOP

x

x

£

Guide

Roller

caemas

‘

:

:

a

t

+

t

+

(b)

FAST-FOR

WARD

x

oO

x

x

if

{c)

REWIND

x

x

a

x

i

+

+

RECORDING

os

O

‘)

PLAYBACK

cs

.

x

*

L

i

—

NOTES

:

X-marks

indicates

“open”

and

“)-marks

“engaged”