Akai X-1810 Manuel utilisateur

X<=-1810

ALSO

APPLCABLE

MODEL

X-1810D

MODEL

Il.

Wi,

IV.

VI.

Vil.

VIL.

IX.

TABLE

CONTENTS

SPECIFICATIONS

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MEASURING

METHOD

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CONTROL

LOCATIONS

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DISMANTLING

TAPE

TRANSPORT

UNIT

AMPLIFIERS

2...

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eenes

TRANSPORT

MECHANISM

2.0...

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MECHANISM

ADJUSTMENT...........-.-0--006-

AMPLIFIER

ADJUSTMENT

...........

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MAINTENANCE

PROCEDURES

.............----5

COMPOSITE

VIEWS

COMPONENTS

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

TROUBLE

SHOOTING

CHART

...........---5-05-

SCHEMATIC

DIAGRAM

When

placing

order

for

parts,

please

use

Separate

PARTS

LIST

PRICE

LIST

FOR

PARTS.

SPECIFICATIONS

STYLE

Portable

WEIGHT

21.4

kg.

(47

Ibs.)

DIMENSIONS

17.4(W)

18(H)

9.6(D)”:

(435

x450

240

mm)

POWER

SUPPLY

100

240V;

50/60

Hz.

RECORDING

SYSTEM

REG)

s:.cce

In-Line

4-track

2-channel

stereo/monaural

CROSS-

FIELD

HEAD

Recording

System

Cartridge

.....

In-Line

8-track

stereo

re-

cording

system

Transfer

.....,

Pre-recorded

conventional

reel

tape

cun

transferred

(dubbed)

cartridge

tape.

PLAY

BACK

SYSTEM

Reel

....cccecees

In-Line

4-track

2-channel

stereo/monaural

playback

system

Cartridge

.....

In-Line

8-track

2-channel

stereo

playback

system

TAPE

SPEED

Reel

5..ccevsisee

speeds

(1-7/8,

3-3/4,

and

7-1/2

ips)

Cartridge

.....

3-3/4

ips

TAPE

SPEED

DEVIATION

Reel

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

£0.8%

Cartridge

.....

+2%

WOW

AND

FLUTTER

(Fwd

and

Reverse

Reel

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

Less

than

0.12%

7-1/2

Playback

only)

ips

Less

than

0.25%

3-3/4

ips

Less

than

0.35%

1-7/8

ips

Cartridge

.....

Less

than

0.35%

FREQUENCY

RESPONSE

Reel

.......s000

22,000

Hz.

dBat

7-1/2

ips

18,000

Hz.

dBat

3-3/4

ips

9,000

1-7/8

ips

Cartridge

.....

16,000

+3 dB

EQUALIZATION

Correct

equalization

for

playback

tapes

recorded

NAB

curve.

SIGNAL

NOISE

RATIO

REEL

ssccrcasvuss

Better

than

Forward

Operation

all

speeds.

Better

than

Reverse

Operation

all

speeds.

Cartridge.....

Better

than

dB.

CROSS-TALK

REEL

ctscisecsoce

Better

than

(mona-

ural)

Better

than

(stereo)

Cartridge

Better

than

ERASE

RATIO

JReeél:cc

Better

than

Cartridge

Better

than

INSULATION

RESISTANCE

than

Ohms

INSULATION

DURABILITY

1,000V

for

than

minute

duration

OUTPUT

LINE

OUTPUT

(or

Din

Output)

1.228V

(OVU.

dB)

with

250Hz

OVU

Recordec

tape.

Required

Load

Impedance

than

KQ.

Forword«—+»

Reverse

maximum

per

each

channel

music

power.

(Total

10W).

Impedance

80.

MAIN

OUTPUT:

INPUT

LINE

INPUT

mV,

Impedance

150

MIC

INPUT

0.5

mV,

Impedance

100

KN.

DIN

INPUT

mV,

Impedance

KO.

FAST

FORWARD

AND

REWIND

TIME

seconds

for

full

1,200

ft.

tape

Hz.

seconds

for

full

1,200

ft.

tape

Hz.

MONITOR

SYSTEM

Program

being

recorded

can

moni-

tored

through

Stereo

Headphones.

MOTORS

Capstan

Motor:

Hysteresis

Synchronous

3-speed

(2-4-

pole)

motor.

Condenser

capacity

(50

Hz),

(60

Hz).

Revolutions

3,000,

1,500,

750

rpm

(50

Hz);

3,600,

1,800,

900

rpm

(60

Hz).

Reel

Motor:

Two

6-pole

eddy

current

outer-rotor

motors.

Revolutions

930

rpm

Hz,

100V;

1,120

rpm

Hz,

110V.

HEADS

Rec/Playback

Head:

(Reel)

In-Line

4-track

2-channel

stereo/

monaural

recording/play

back.

Gap:

2/1000mm,

Impedance:

1,200

1,000

Hz.

Bias

Head:

In-Line

4-track

2-channel

stereo/

monaural.

Gap:

0.2

mm,

Impedance:

5001

KHz.

Erase

Head:

In-Line

4-track

2-channel

stereo/

monaural,

Gap:

0.2

mm,

Impedance

5009

KHz.

(Cartridge)

Rec/Playback

Head:

In-Line

8-track

2-channel

stereo.

Gap:

1/1000

mm,

Impedance:

7509

+15%

1,000

Hz.

Erase

Head:

In-Line

8-track

2-channel

stereo.

Gap:

0.1

mm,

Impedance:

2109

+10%

KHz,

RECORDING

LEVEL

INDICATOR

Vertical

twin

type

Meters

RECORDING

CAPACITY

Reel

....

hours

monaural

record-

ing

1-7/8

ips

using

1.200

ft.

tape.

hours

stereo

recording

1-7/8

ips

using

1,200

ft.

tape.

Cartridge

.....

hour

stereo

recording

using

300

ft.

cartridge

tape.

KHz

KHz.

2.5

seconds.

BIAS

FREQUENCY:

MUTING

TIME

TRANSISTORS

USED

2SC1060

(B) (C)

vice

2SC650

(A)

......

2SC945

(Q)

(R)

2SC968

(3)

(4)..

a7)

28D223

(Y)

2SC281

(B)

2SC45B

(C)

cccecscsscrseeseeeres

2SC458

(B)

ccccccssseseseceeee

SC971

(3)

(2)

...

2SC1211

(C)

(D)

vce

SILICON

DIODES

USED

10D1

(or

VO6B)

10DC-1

(BIK)

w.......

RD24A

(or

18339A)

wu...

10D1

10D2...

10D4

GERMANIUM

DIODES

USED

IN34A

REEL

CAPACITY

5or7”

CARTRIDGE

AKAI

8-track

cartridge

(Lear

Jet

type)

POWER

CONSUMPTION

110W

(X-1810D

95W)

ll.

MEASURING

METHOD

TAPE

SPEED

DEVIATION

Method

involving

use

pre-recorded

tape.

Playback

tape

pre-recorded

1,000

(£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

measurement

error

inevitable,

that

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%

for

measurement

means

wow

meter.

also

possible

for

3,000

sine

wave

recorded

and

played

back

for

measurement

means

the

wow

meter.

this

case,

however,

the

wow

meter

indicates

value

much

twice

the

value

given

the

specifi-

cations.

SIGNAL

NOISE

RATIO

X-1810

Line

output

Set

the

Equalizer

Switch

“7-1/2”

ips

position

and

playback

tape

containing

250

sine

wave

recorded

“O’’VU

level

standard

recorder.

Connect

V.T.V.M.

the

line

output

jack

the

recorder

and

measure

its

output.

Then

remove

the

tape

and

measure

the

noise

level

under

the

same

condition.

Convert

each

the

measured

values

into

decibels.

[V.T.V.M]

TOTAL

HARMONIC

DISTORTION

FACTOR

Ke/s

Oscillator

Meter

Connect

the

measuring

instrument

shown

above,

and

record

the

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

required

distortion

factor

may

obtained

from

the

results

the

above

measurement

the

following

formula:

do=d—di

—d2

where,

do=Required

=Overall

distortion

factor

di=Noise

level

d2=Distortion

factor

the

oscillator

(Note:

New

tape

particularly

good

quality

should

used

for

measurement

the

distortion

factor.)

POWER

OUTPUT

Playback

tape

containing

sine

wave

250

recorded

“O”

standard

recorder.

Measure

the

Voltage

the

output

the

recorder

tested

when

terminated

with

Then

use

the

following

formula:

Desired

output

(W)

Measured

Voltage

(R.M.S.)

R=8Q

CROSS

TALK

(Cross

talk

between

the

tracks)

(TAPE)

Ree

PSS

nos

Tape

direction

“a

Tape

direction

shown

the

figure,

first

record

1,000

sim

wave

track

No.

level.

Next,

remore

the

1,000

input

signal

and

record

under

nonimput

condition.

Then,

playback

the

tape

track

No.

and

No.

(reversed

condition

tape)

through

the

1,010

B.P.F.

(Band

Pass

Filter,

Sensitivity

1:1)

and

obtain

ratio

between

the

two

from

the

following

formuh:

C=201

(db

—E1

)

=Desired

crosstalk

ratio

(db)

=1,000

signal

output

level

(me

=1,000

crosstalk

output

level

2277777)

=No-input

signal

record

level

REERS

FREQUENCY

RESPONSE

Audio

Oscillator

Connect

the

measuring

instrument

the

above

diagram,

and

measure

the

frequency

response

the

following

sequence:

RECORD

Introduce

sine

wave

1,000

the

Line

In-

put

the

recorder

tested,

through

attenuator

from

audio

frequency

generator.

Set

the

Record/Playback

Knob

“Rec”

posi-

tion

and

adjust

the

line

input

volume

that

the

meter

needle

indicates

“0”

VU.

Under

the

condition

described

(2),

lower

the

input

level

(cartridge

dB)

means

the

attenuator.

Record

the

spot

frequency

the

range

23,000

from

the

audio

frequency

generator.

PLAYBACK:

Set

the

Record/Playback

Knob

“Play”

position.

Set

the

Equalizer

7-1/2,

3-3/4,

1-7/8

ips

position.

Connect

High

Sensitivity

V.T.V.M.

the

Line

output.

Playback

the

tape

previously

recorded.

Adjust

the

output

level

“0”

dbm

1,000

(indicated

range

selector

V.T.V.M.).

10)

Playback

the

recorded

spot

frequencies,

make

memo

output

level,

and

plot

the

value

graph.

(Note:

New

tape

particularly

good

quality

should

used

for

measurement

the

frequency

response.

AKAI

100F

tape

recommended).

ll.

CONTROL

LOCATIONS

Index

Counter

Reset

Button

Tape

Speed

Selector

Built-in

Speaker

‘X-1810

only}

~-Take-up

Reel

Table

Built-in

Reel

Retainer

Tape

Guide

Automatic

Shut-off

Lever

Playback/Record

Lever

Built-in

Speaker

‘X-1810

onty:

Supply

Reel

Table——

Built-in

Reel

Retainer---—

Cycle

Conversion

switch

‘A

Pinch

Wheel

Tape

Tension

Lever

Sensing

Capstan

—

Pause

Lever

Track

Selector

Start

Button

Sensing

——

Fast

Forward/Rewind

Lever

one

Automatic

Shut-off

Switch

Right

Channel

Volume

Tone

Control

Power

Switch

S.R.T.

Button

Manual}

Reverse

Buttons

Record

Safety

Button

Equalizer

Switch

Left

Channe!

Volume

Tone

Control

Left

MEter

—Right

Meter

Headphone

Jack

Speaker

Switch

Left

Right

Microphone

Jacks

---——Tieseees

Program

Selector

Button

Program

Indicator

Lamps

Mode

Selector

Switches

Remote

Coniro!

Socket

Cycle

Conversion

Switch

‘B}

;

Fuse

Post

Voltage

Selector

Speaker

Jacks

(Left/Right)

(Model

X-1810

only;

Output

Jacks

(Lift/

Right)

Input

Jacks

‘Lift/

Right}

Din

Jack

Cord

saan

-Built-in

Speaker

X-1310

only:

Cartridge

Rcepotacle

Cartridge

Automatic

Stop

/Continuous

Pla

witch

IV.

DISMANTLING

TAPE

TRANSPORT

UNIT

AMPLIFIERS

case

trouble,

etc.

necessitating

disassembly,

please

disassemble

the

order

shown

photographs.

Reas-

semble

reverse

order.

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OSS

ORS

STORE

ORS

RSIS

RSE

ARS

SRS

RST

ORS

OAS

ORS

RST

ORS

RST

ORS

PRS

ORS

NSE

CASE

BLOCK

CONNECTION

PLUGS

MECHANISM

BLOC

band

AMPLIFIER

BLOCK

ECHANISM

PANEL

-B

PEIGEGL

™~

SES

ESOS

EEE EEE

BEBE

EEE

SOL

EERE

BE EE

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EEE

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EEE

TRANSPORT

MECHANISM

SWOO08b

5-7

[wes

NHS

eng

S¥

po203

00204

S¥

IN34A

—

IN34A

TRO201

TRO202

TRO203

TRO204

28€945(Q)(R)

28C945(0)(R)

2SCI2IIC)

25C458(C)

FWD.—>

REV,

FORWARD

PLAY

OFF

(AFTER

SEC,

OFF

REVERSE

PLAY

OFF

(AFTER

2.5

105

SEC,OFF)

Fig.

SYSTEM

CONTROL

CIRCUIT

FORWARD

PLAY

(Recording)

(Pinch

Roller

Pressure

1.5

Kgr.

1.8

Kgr.)

When

Recording/Playback

Lever

set

PLAY

position,

the

Pinch

Roller

Presses

against

Capstan

move

the

tape

the

rated

speed.

The

Brake

Levers

free

the

Brake,

and

Lever

Spring

(G)

turns

“on”

Micro

(SW

006

operation

switch).

System

control

TRO201

turned

“off”,

TRO202

“on”,

and

TRO203

TRO204

“off”.

About

60V

current

supplied

the

take-up

motor

and

about

30V

the

supply

motor,

that

the

torque

motors

become

operative.

(See

Fig.

System

Control

and

Motor

Circuit

Block

Diagram

SW006

(OPERATION

SW.)

RO2i3.

D202

a-2

l2w

10D4

(sm)

Ei3

REV,

100V

HOV

50Hz

60Hz

ace)

[oe

—

MAIN

ris

Vas

‘

MOTOR

RWD.

Swe

—{><}-+-—

sotenoio

———*————-

NORMAL

CLOSED

CONTACT

———{]———

NORMAL

OPEN

CONTACT

Fig.2

FORWARD

PLAY

SUPPLY

VOLTAGE

BOTH

TORQUE

MOTORS

DURING

RECORDING/PLAYBACK

‘SUPPLY

MOTOR

TAKE-UP

MOTOR

Forward

Play

30V

(50

70gr)

60V

(210gr)

First

2.5

sec.

normal

47V

(100gr)

47TV

(100gr)

reverse

Reverse

Play

60V

(210gr)

30V

(50

70gr)

RWD.

Fwd.

Fig.

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