Akai 1730-SS Manuel utilisateur

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TABLE

CONTENTS

SPECIFICATIONS

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MEASURING

METHODS

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

CONTROL

LOCATIONS

....

20.0.2...

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DISMANTLING

TAPE

TRANSPORT

UNIT

AMPLIPIERS

202s

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deed

sone

coed

darade

TRANSPORT MECHANISM

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

MECHANISM

ADJUSTMENT

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

AMPLIFIER

ADJUSTMENT

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

MAINTENANCE

PROCEDURES

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

TROUBLE

SHOOTING

CHART

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

COMPOSITE

VIEWS

COMPONENTS

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

SCHEMATIC

DIAGRAM

When

placing

order

for

parts,

please

use

Separate

PARTS

LIST

PRICE

LIST

FOR

PARTS.

SPECIFICATIONS

WEIGHT

DIMENSIONS

37.5

Ibs.

(17.0

kg)

18"(H)

16.5’°(W)

9.5'(D)

(H450

W420

D240

mm)

POWER

SUPPLY

100

240

AC,

50/60

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

(Deck

TAPE

SPEED

3-3/4,

7-1/2

ips.

TAPE

SPEED

DEVIATION

Within

+1.5%

all

speeds.

WOW

AND

FLUTTER

Less

than

0.15%

R.M.S.

7-1/2”

Less than

0.2%

R.M.S.

3-3/4"

FREQUENCY

RESPONSE

22,000

7-1/2”

13,000

3-3/4”

SIGNAL

NOISE

RATIO

than

DISTORTION

(Total

Harmonics)

Within

1,000

OVU

recording

(LINE

OUTPUT)

Within

1,000

(when

terminated

with

82)

(MAIN

OUTPUT)

CROSS-TALK

Less than

—SO

(track)

Less

than

—40

(channel)

ERASE

RATIO

Less

than

INSULATION

RESISTANCE

than

INSULATION

DURABILITY

1,000

for

than

one

minute

duration

LINE

OUTPUT

41.5

(1.228

V),

OVU

indi-

cation,

250

OVU

recorded

tape

Required

load

impedance

than

25K

than

Impedance

;

—6

+1.5dB

when

using

250

recorded

tape

POWER

OUTPUT

DIN

OUTPUT

Required

load

impedance

than

Above

Impedance

;

330

Above

0.4

Impedance

;

Above

Impedance

;

100

LINE

INPUT

MIC.

INPUT

DIN

INPUT

FAST

FORWARD

REWIND

TIME

MONITOR

SYSTEM

(recording)

MOTOR

HEADS

RECORDING

HEAD

PLAYBACK

HEAD

ERASE

HEAD

ERASE

HEAD

TRANSITORS

USED

DIODES

REELS

seconds

1,200

ft.

tape

seconds

1,200

ft.

tape

With

Record/Play

back

Switch

“REC”

The

program

being

recorded

can

monitored

using

built-in

speakers

stereo

headphones

external

speakers

crystal

receiver

Hysteresis

synchronous

speed

motor

Horse

Power:

1/100

Power

Ratio:

85%

Revolutions

3,000

1,500

R.P.M.

3,600

1,800

R.P.M.

Condenser

capacity

In-line

4-track

4-channel

stereo

(4-track

2-channel

stereo)

Impedance

125

420%

1,000

Gap:

4/1,000

In-line

4-track

4-channel

stereo

(4-track

2-channel

stereo)

Impedance

1,200

+15%

1,000

Gap

2/1,000

In-line

4-track

2-channel

stereo

Impedance:

195

+10%

100

KHz

In-line

Full

track

Impedance

350

+10%

100

KHz

2SC458LG

(C)

apCURDING

28C871

(E,F)

AMPLIFIER

LD-3141

}

2SC458LG

(C)

PLAYBACK

LD-3141

AMPLIFIER

STK-011(A)

MAIN

AMPLIFIER

2SC971

(2,3)

(RED)

BIAS

OSC.

2SD223

(Y)x

POWER

AMP.

IN34A

VO6B

10DC-1

(BLACK)

RD-24A

(M)

7'',

reels

can

used.

lil.

MEASURING

METHOD

TAPE

SPEED

DEVIATION

Method

involving

use

pre-recorded

tape

Playback

tape

pre-recorded

1000

(+0.1%)

recorder

tested.

Connect

the

appropriate

output

frequency

counter

meter

order

measure

the

tape

speed

deviation.

Method

involving

use

timing

tape.

(designed

for

tape

speed

measurement)

This

method

utilizes

timing

tape

marked

intervals

7-1/2".

The

running

time

over

marked

sections

tape

measured

order

calculate

the

deviation

the

tape

speed.

applying

this

method,

however,

should

kept

mind

that

timing

tape

stretch

contract

measure-

ment

error

inevitable,

that

it is

necessary

measure

the

total

length

the

tape

advance.

WOW

AND

FLUTTER

Playback

3,000

pre-recorded

tape,

which

the

wow

and

flutter

level

guaranteed

smaller

than

0.07%,

and

measure

with

wow

meter.

also

possible

for

3,000

sine

wave

recorded

and

played

back

for

measurement

with

wow

meter.

this

case,

however,

the

wow

meter

will

indicate

value

much

twice

that

given

the

specifications.

SIGNAL

NOISE

RATIO

1730-SS

atv

Set

the

Equalizer

Switch

the

“7-1/2

ips”

position

and

playback

tape

containing

250

sine

wave

recorded

“Q’

level

standard

recorder.

Connect

V.T.V.M.

the

line

output

jack

the

recorder

and

measure

its

output.

Next,

remove

the

tape

and

measure

the

noise

level

under

the

same

conditions.

Convert

each

the

measured

values

into

decibels.

TOTAL

HARMONIC

DISTORTION

FACTOR

KHz

Audio

1730-SS

Distortion

Oscillator

meter

Connect

the

measuring

instruments

shown

above,

and

record

1,000

sine

wave

“0”

VU.

Playback

the

resultant

signal

and

measure

the

overall

distortion

factor.

Measure

the

noise

level

the

tape

recorder

with

the

tape

removed

;

connect

the

audio

oscillator

directly

the

distortion

meter

for

measurement

the

distortion

factor

the

oscillator.

The

resultant

distortion

factor

can

obtained

from

the

results

the

above

measurement

using

the

following

formula

d—d,

—d2

where,

Required

Overall

distortion

factor

d,;

Noise

level

Distortion

factor

the

oscillator

(Note

New

tape

particularly

good

quality

should

used

for

measurement

the

distortion

factor.

Fuji

recommended).

POWER

OUTPUT

Playback

tape

containing

sine

wave

250

recorded

“0”

ona

standard

recorder.

Measure

the

Voltage

the

output

the

recorderto

tested

when

terminated

with

Q..

Then

use

the

following

formula

Desired

output

(W)

Measured

Voltage

(R.M.S.)

R=8Q2

CROSS

TALK

Between

the

tracks

Channel)

(TAPE)

ZENG

BKC

Tape

direction

shown

the

figure,

first

record

1,000

sine

wave

track

No.3

level.

Next,

remove

the

1,000

input

signal

and

record

under

non-input

condition.

Then,

playback

the

tape

tracks

and

(reversed

condition

tape)

through

the

1,000

B.P.F.

(Band

Pass

Filter,

Sensitivity

...

and

obtain

the

ratio

between

the

two

using

the

following

formula.

log?

(AB)

2°c=

Desired

cross

talk

ratio

(dB)

1,000

signal

output

level

BES

1,000

cross

talk

output

level

Non-input

signal

record

level

CERRY

Between

the

channels

Channel)

Tape

direction

©)

shown

the

figure,

first

record

1,000

sine

wave

track

No.1

level.

Next,

remove

the

1,000

input

signal

and

record

under

non-input

condition.

Then,

playback

the

tape

track

No.1

and

No.

through

the

1,000

B.P.F.

(Band

Pass

Filter,

Sensiti-

vity

...

1:1)

and

obtain

ratio

between

the

two

from

the

following

formula.

log

(dB)

Desired

cross-talk

ratio

(dB)

1,000

signal

output

level

fest

1,000

cross-talk

output

level

CLA

No-input

signal

record

level

RES

Tape

direction

FREQUENCY

RESPONSE

Audio

1730-SS

Oscillator

Input

Output

Connect

the

measuring

instruments

shown

the

above

diagram,

and

measure

the

frequency

response

the

following

sequence

RECORD

Introduce

sine

wave

1,000

the

Line

Input

the

recorder

being

tested

through

attenuator

from

audio

frequency

generator.

Set

the

Record/Playback

Lever

‘‘Rec”

position

and

adjust

the

line

input

volume

that

the

meter

needle

indicates

“0”

VU.

Under

the

conditions

described

(2),

lower

the

input

level

with

the

attenuator.

Record

the

spot

frequency

from

the

audio

fre-

quency

generator

the

range

23,000

Hz.

PLAYBACK

Set

the

Record/Playback

Lever

“Play”

position.

Connect

V.T.V.M.

the

Line

Output.

Playback

the

previously

recorded

tape.

Adjust

the

output

level

“0”

dBm

1,000

(indicated

range

selector

V.T.V.M.).

Playback

the

recorded

spot

frequencies

under

the

conditions

(8);

make

memo

Output

Level

and

plot

the

value

ona

graph.

(Note

New

tape

particularly

good

quality

should

used

for

measurement

the

frequency

response.

Fuji

tape

recommended).

case

trouble,

etc.

necessitating

disassembly,

pleas

disassemble

the

order

shown

photographs.

Reas-

semble

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

METER

(Right)

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)

METER

[Right)

METER

(Left)

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

TAPE

TRANSPORT

UNIT

AMPLIFIERS

case

trouble,

etc,

necessitating

disassembly,

please

disassemble

the

order

shown

photographs.

Reas-

semble

reverse

order.

EAY,

REC.-LE'

RWOMLEVER

"MECH.

AMP.

BLOCK

CASE

BLOCK

(ei)

we)

WI)

RETAINING

PLATE

TRANSPORT

MECHANISM

Fig.

Braked

Rotation

CAPSTAN

DRIVE

Figure

(A)

Motor

(B)

Drive

Belt

(flat

belt)

(C)

Capstan

(D)

Flywheei

High-speed

rotation

Motor

(A)

transmitted

Drive

Belt

(B)

Capstan

(C);

which

connected

flywheel

that

provides

necessary

inertia.

This

flywheel

maintains

the

rated

rotation

and

absorbs

minor

rotation

variations

the

motor.

Capstan

Rotation

606

R.P.M.

7-1/2”

(19

cm)

per

sec.

303

R.P.M.

3-3/4”

(9.5

cm)

per

sec.

151.5

R.P.M.

1-7/8"

(4.75

cm)

per

sec.

Motor

Rotation

3,000

1,500

R.P.M.

3,600

1,800

R.P.M.

PINCH

WHEEL

DRIVE

The

pressure

the

pinch

wheel

pushes

against

capstan,

transports

tape

between

rotating

capstan

and

pinch

wheel

the

rated

speed.

The

proper

pinch

wheel

pressure

between

1,000

1,150

grams

the

tape

speed

7-1/2’

(19

cm)

per

second.

RECORD

AND

PLAYBACK

MECHANISM

Turning

the

RECORD/PLAYBACK

LEVER

(A)

“PLAY”

position

causes

the

pinch

wheel

press

against

the

capstan

and

move

the

tape

the

rated

speed.

the

same

time,

Idler

(B)

moves

between

Motor

Bushing

(C)

and

the

Take-Up

Reel

Spindle

(D)

transmit

the

motor

rotation

(D)

that

the

tape

moved

and

wound

the

take-up

reel.

The

Take-up

Reel

Spindle

Base,

composed

two

plastic

wheels

(discs)

and

witha

felt

clutch

between,

rotated

from

below

the

idler.

Tape-winding

friction

adjusted

the

slipping

the

felt

and

maintains

rated

winding

the

tape.

The

Supply

Reel

Spindle

(H)

hasa

Brake

Roller

(E)

contacting

plastic

wheel

(disc)

(4)

from

below

which

provides

appropriate

back

tension

the

slipping

the

felt

clutch

the

rotation

the

Pulley

(3)

above.

prevent

accidental

erasure,

the

Record

Safety

Button

(F)

must

depressed

before

the

RECORD/PLAYBACK

LEVER

can

moved

the

“REC”

position.

Safety

device

(G)

depressed

operate

the

recording

mechanism.

(See

figure

FAST-FORWARD

MECHANISM

Turning

the

FAST

FWD-REWIND

LEVER

(A)

“FAST

FWD”

position,

causes

cam

(B)

under

the

knob

push

Lever

(C).

Idler

(D)

moves

into

the

space

between

Plastic

Roller

(F)

above

the

Take-Up

Reel

Spindle

and

the

upper

part

the

rotating

motor

drive

bushing

transmit

the

motor

rotation

the

take-up

reel

spindle.

the

same

time,

Brake

Rollers

(H)

and

(I)

come

off

the

reel

spindle

free

Supply

Reel

Spindles

(G)

and

(F),

thereby

allowing

fast

winding

the

tape

onto

the

take-up

reel.

(See

figure

REWIND

MECHANISM

nee

Turning

the

FAST

FWD-REWIND

knob

(A)

“REWIND”

position,

causes

cam

(B)

under

the

knob

push

Lever

(C).

Idler

(D)

moves

into

the

space

between

the

upper

part

the

rotating

Motor

drive

bushing

(E)

and

the

Intermediate

Pulley

(F)

transmit

the

high-speed

rotation

the

motor

through

the

intermediate

pulley

Supply

Reel

Spindle

(G).

the

same

time,

Brake

Rollers

(H)

and

(I)

come

off

the

reel

spindle

free

take-up

reel

spindles

(J)

and

(G),

thereby

rewinding

the

tape

onto

the

supply

reel

fast

speed.

(See

figure

STOP

CONTROL

Turning

the

stop

lever

“STOP”

position,

causes

Brake

Rollers

(A)

and

(B)

depress

the

reel

spindles

andstop

rotation.

take-up

Reel

Sendie’

ier

/F7w

the

brake

rubbers

depress

the

plastic

rollers

below

the

‘

reel

spindles,

friction

applied

the

tape.

(See

figure

Pinch

ake-up

Rewind

Take-up

Swp

Modes

Operation

Wheel

Idler

side

ide

Wheel

Brake

Buk

€

aie

STOP

Guide

Roller

caemas

‘

(b)

FAST-FOR

WARD

{c)

REWIND

RECORDING

‘)

PLAYBACK

—

NOTES

X-marks

indicates

“open”

and

“)-marks

“engaged”

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