Akai X-1810 User manual

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X<=-1810

ALSO

APPLCABLE

TO

MODEL

X-1810D

MODEL

Il.

Wi,

IV.

VI.

Vil.

VIL.

IX.

ia

TABLE

OF

CONTENTS

SPECIFICATIONS

......

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2

MEASURING

METHOD

........

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3

CONTROL

LOCATIONS

.......

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eee

5

DISMANTLING

OF

TAPE

TRANSPORT

UNIT

&

AMPLIFIERS

2...

0.00.0

c

been

te

eee

nent

eenes

6

TRANSPORT

MECHANISM

..

2.0...

000002

ee

eee

ee

8

MECHANISM

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

15

AMPLIFIER

ADJUSTMENT

...........

00000

eee

eee

20

MAINTENANCE

PROCEDURES

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

22

COMPOSITE

VIEWS

OF

COMPONENTS

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

23

TROUBLE

SHOOTING

CHART

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

30

SCHEMATIC

DIAGRAM

When

placing

order

for

parts,

please

use

Separate

PARTS

LIST

or

PRICE

LIST

FOR

PARTS.

I.

SPECIFICATIONS

STYLE

Portable

WEIGHT

21.4

kg.

(47

Ibs.)

DIMENSIONS

17.4(W)

x

18(H)

x

9.6(D)”:

(435

x450

x

240

mm)

POWER

SUPPLY

AC

100

to

240V;

50/60

Hz.

RECORDING

SYSTEM

REG)

3.

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

be

transferred

(dubbed)

to

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

3

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%

at

7-1/2

Playback

only)

ips

Less

than

0.25%

at

3-3/4

ips

Less

than

0.35%

at

1-7/8

ips

Cartridge

.....

Less

than

0.35%

FREQUENCY

RESPONSE

Reel

.......s000

30

to

22,000

Hz.

+3

dBat

7-1/2

ips

30

to

18,000

Hz.

+3

dBat

3-3/4

ips

30

to

9,000

Hz

+3

dB

at

1-7/8

ips

Cartridge

.....

50

to

16,000

Hz

+3 dB

EQUALIZATION

:

Correct

equalization

for

playback

of

tapes

recorded

to

NAB

curve.

SIGNAL

TO

NOISE

RATIO

REEL

ssccrcasvuss

Better

than

46

dB

Forward

Operation

at

all

speeds.

Better

than

44

dB

Reverse

Operation

at

all

speeds.

Cartridge.....

Better

than

41

dB.

CROSS-TALK

f

REEL

ctscisecsoce

Better

than

65

dB

(mona-

ural)

Better

than

43

dB

(stereo)

Cartridge

Better

than

50

dB

ERASE

RATIO

®

JReeél:cc

.

Better

than

70

dB

Cartridge

Better

than

65

dB

INSULATION

RESISTANCE

More

than

50

M

Ohms

INSULATION

DURABILITY

1,000V

AC

for

more

than

1

minute

duration

OUTPUT

LINE

OUTPUT

:

(or

Din

Output)

1.228V

(OVU.

+

4

dB

+2

dB)

with

a

250Hz

OVU

Recordec

tape.

Required

Load

Impedance

more

than

20

KQ.

Forword«—+»

Reverse

+2

dB

5W

maximum

per

each

channel

at

music

power.

(Total

10W).

Impedance

80.

MAIN

OUTPUT:

INPUT

LINE

INPUT

60

mV,

Impedance

150

K

9.

MIC

INPUT

0.5

mV,

Impedance

100

KN.

DIN

INPUT

20

mV,

Impedance

68

KO.

FAST

FORWARD

AND

REWIND

TIME

80

seconds

for

a

full

1,200

ft.

tape

at

50

Hz.

65

seconds

for

a

full

1,200

ft.

tape

at

60

Hz.

MONITOR

SYSTEM

:

Program

being

recorded

can

be

moni-

tored

through

Stereo

Headphones.

MOTORS

Capstan

Motor:

Hysteresis

Synchronous

3-speed

(2-4-

8

pole)

motor.

Condenser

capacity

3

uF

(50

Hz),

2

4

F

(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

at

50

Hz,

100V;

1,120

rpm

at

60

Hz,

110V.

HEADS

Rec/Playback

Head:

(Reel)

In-Line

4-track

2-channel

stereo/

monaural

recording/play

back.

Gap:

2/1000mm,

Impedance:

1,200

0

at

1,000

Hz.

Bias

Head:

In-Line

4-track

2-channel

stereo/

monaural.

Gap:

0.2

mm,

Impedance:

5001

at

65

KHz.

Erase

Head:

In-Line

4-track

2-channel

stereo/

monaural,

Gap:

0.2

mm,

Impedance

5009

at

65

KHz.

(Cartridge)

Rec/Playback

Head:

In-Line

8-track

2-channel

stereo.

Gap:

1/1000

mm,

Impedance:

7509

+15%

at

1,000

Hz.

Erase

Head:

In-Line

8-track

2-channel

stereo.

Gap:

0.1

mm,

Impedance:

2109

+10%

at

65

KHz,

RECORDING

LEVEL

INDICATOR

:

Vertical

twin

type

VU

Meters

RECORDING

CAPACITY

Reel

....

.

8

hours

monaural

record-

ing

at

1-7/8

ips

using

a

1.200

ft.

tape.

4

hours

stereo

recording

at

1-7/8

ips

using

a

1,200

ft.

tape.

Cartridge

.....

1

hour

stereo

recording

using

a

300

ft.

cartridge

tape.

65

KHz

+5

KHz.

2.5

to

5

seconds.

BIAS

FREQUENCY:

MUTING

TIME

TRANSISTORS

USED

2SC1060

(B) (C)

vice

4

2SC650

(A)

......

.4

2SC945

(Q)

(R)

.2

2SC968

(3)

(4)..

a7)

28D223

(Y)

1

2SC281

(B)

4

2SC45B

(C)

cccecscsscrseeseeeres

3

2SC458

(B)

ccccccssseseseceeee

2

SC971

(3)

(2)

...

2

2SC1211

(C)

(D)

vce

1

SILICON

DIODES

USED

10D1

(or

VO6B)

2

10DC-1

(BIK)

w.......

|

RD24A

(or

18339A)

wu...

1

10D1

3

10D2...

2

10D4

1

GERMANIUM

DIODES

USED

IN34A

_7

REEL

CAPACITY

:

5or7”

CARTRIDGE

AKAI

8-track

cartridge

(Lear

Jet

type)

POWER

CONSUMPTION

110W

(X-1810D

95W)

a

ee

8

ee

ll.

MEASURING

METHOD

TAPE

SPEED

DEVIATION

1.

Method

involving

use

of

pre-recorded

tape.

Playback

a

tape

pre-recorded

at

1,000

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

measurement

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%

for

measurement

by

means

of

a

wow

meter.

It

is

also

possible

for

a

3,000

Hz

sine

wave

to

be

recorded

and

played

back

for

measurement

by

means

of

the

wow

meter.

In

this

case,

however,

the

wow

meter

indicates

a

value

as

much

as

twice

the

value

given

in

the

specifi-

cations.

SIGNAL

TO

NOISE

RATIO

X-1810

a

eS

Line

output

Set

the

Equalizer

Switch

to

“7-1/2”

ips

position

and

playback

a

tape

containing

a

250

Hz

sine

wave

recorded

at

“O’’VU

level

on

a

standard

recorder.

Connect

a

V.T.V.M.

to

the

line

output

jack

of

the

recorder

and

measure

its

output.

Then

remove

the

tape

and

measure

the

noise

level

under

the

same

condition.

Convert

each

of

the

measured

values

into

decibels.

[V.T.V.M]

TOTAL

HARMONIC

DISTORTION

FACTOR

1

Ke/s

a

Oscillator

Meter

Connect

the

measuring

instrument

as

shown

above,

and

record

the

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

required

distortion

factor

may

be

obtained

from

the

results

of

the

above

measurement

by

the

following

formula:

do=d—di

—d2

where,

do=Required

d

=Overall

distortion

factor

di=Noise

level

d2=Distortion

factor

of

the

oscillator

(Note:

New

tape

of

particularly

good

quality

should

be

used

for

measurement

of

the

distortion

factor.)

POWER

OUTPUT

Playback

a

tape

containing

a

sine

wave

of

250

Hz

recorded

at

“O”

VU

on

a

standard

recorder.

Measure

the

Voltage

at

the

output

of

the

recorder

to

be

tested

when

terminated

with

8

Q.

Then

use

the

following

formula:

E2

P

=

Desired

output

(W)

p=

E=

Measured

Voltage

(R.M.S.)

-

R=8Q

CROSS

TALK

(Cross

talk

between

the

tracks)

(TAPE)

Ree

PSS

|

2

nos

Tape

direction

“a

=

yy

Tape

direction

As

shown

in

the

figure,

first

record

a

1,000

Hz

sim

wave

on

track

No.

3

at

+3

VU

level.

Next,

remore

the

1,000

Hz

input

signal

and

record

under

a

nonimput

condition.

Then,

playback

the

tape

on

track

No.

3

and

No.

1

(reversed

condition

of

tape)

through

the

1,010

Hz

B.P.F.

(Band

Pass

Filter,

Sensitivity

.

..

1:1)

and

obtain

a

ratio

between

the

two

from

the

following

formuh:

C=201

ae

(db

=

O

:

E2

—E1

)

C

=Desired

crosstalk

ratio

(db)

Eo

=1,000

Hz

signal

output

level

(me

E2

=1,000

Hz

crosstalk

output

level

2277777)

E1

=No-input

signal

record

level

REERS

ac

3

FREQUENCY

RESPONSE

Audio

Oscillator

Connect

the

measuring

instrument

as

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

In-

put

of

the

recorder

to

be

tested,

through

an

attenuator

from

an

audio

frequency

generator.

2)

Set

the

Record/Playback

Knob

in

to

“Rec”

posi-

tion

and

adjust

the

line

input

volume

so

that

the

VU

meter

needle

indicates

“0”

VU.

3)

Under

the

condition

described

in

(2),

lower

the

input

level

16

dB

(cartridge

20

dB)

by

means

of

the

attenuator.

4)

Record

the

spot

frequency

in

the

range

of

30

Hz

to

23,000

Hz

from

the

audio

frequency

generator.

PLAYBACK:

5)

Set

the

Record/Playback

Knob

to

“Play”

position.

6)

Set

the

Equalizer

to

7-1/2,

3-3/4,

or

1-7/8

ips

position.

7)

Connect

a

High

Sensitivity

V.T.V.M.

to

the

Line

output.

8)

Playback

the

tape

previously

recorded.

9)

Adjust

the

output

level

to

“0”

dbm

at

1,000

Hz

(indicated

on

range

selector

of

V.T.V.M.).

10)

Playback

the

recorded

spot

frequencies,

make

a

memo

of

output

level,

and

plot

the

value

on

a

graph.

(Note:

New

tape

of

particularly

good

quality

should

be

used

for

measurement

of

the

frequency

response.

AKAI

100F

tape

is

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

Pin

Capstan

—

Pause

Lever

Track

Selector

Start

Button

Sensing

Pin

——

-

-

Fast

Forward/Rewind

Lever

a

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

VU

MEter

—Right

VU

Meter

Headphone

Jack

Speaker

Switch

Left

&

Right

Microphone

Jacks

---——Tieseees

Program

Selector

Button

a

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

AC

Cord

saan

-Built-in

Speaker

©

X-1310

only:

Cartridge

Rcepotacle

Cartridge

Automatic

Stop

/Continuous

Pla

S

witch

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.

II

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OSS

RS

RS

ORS

STORE

ORS

RSIS

RSE

ARS

SRS

SY

RST

ORS

RS

ORS

ORS

RS

ORS

OAS

ORS

ORS

RST

ORS

RST

ORS

ORS

PRS

ORS

ORS

NSE

OS

RS

Og

OR

OE

OR

OE

ON

K

CASE

BLOCK

CONNECTION

PLUGS

MECHANISM

BLOC

band

AMPLIFIER

BLOCK

ECHANISM

PANEL

Le

-B

AO

a)

PEIGEGL

SD

™~

SES

ESOS

EEE EEE

BEBE

EEE

SOL

PE

EERE

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EEE

OEE

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EEE

EE

V.

TRANSPORT

MECHANISM

SWOO08b

5-7

[wes

OO

NHS

at

|

eng

©

<=

+

5

N

oO

OO

we

S¥

po203

00204

S¥

oN

AN

at

SS

SS

IN34A

—

IN34A

SS

TRO201

TRO202

TRO203

TRO204

28€945(Q)(R)

28C945(0)(R)

2SCI2IIC)

25C458(C)

FWD.—>

REV,

ON

FORWARD

PLAY

OFF

ON

OFF

(AFTER

2

10

5

SEC,

OFF

REVERSE

PLAY

ON

OFF

ON

(AFTER

2.5

105

SEC,OFF)

Fig.

1

SYSTEM

CONTROL

CIRCUIT

1.

FORWARD

PLAY

(Recording)

(Pinch

Roller

Pressure

1.5

Kgr.

to

1.8

Kgr.)

When

Recording/Playback

Lever

is

set

to

PLAY

position,

the

Pinch

Roller

Presses

against

Capstan

to

move

the

tape

at

the

rated

speed.

The

Brake

Levers

free

the

Brake,

and

Lever

Spring

(G)

turns

“on”

Micro

SW

(SW

006

operation

switch).

System

control

TRO201

is

turned

“off”,

TRO202

“on”,

and

TRO203

&

TRO204

“off”.

About

a

60V

current

is

supplied

to

the

take-up

motor

and

about

30V

to

the

supply

motor,

so

that

the

torque

motors

become

operative.

(See

Fig.

2)

System

Control

and

Motor

Circuit

Block

Diagram

SW006

(OPERATION

SW.)

RO2i3.

D202

a-2

l2w

5K

10D4

~

Y

(sm)

Ei3

o

REV,

©

100V

HOV

q4

z

50Hz

60Hz

3

°

ace)

ee

[oe

ud

>

—

<

&

S|

&

MAIN

ris

>

Vas

‘

é

MOTOR

NI

in

Rg

nN

2

3

3

w

RWD.

=

Swe

—{><}-+-—

sotenoio

———*————-

NORMAL

CLOSED

CONTACT

———{]———

NORMAL

OPEN

CONTACT

Fig.2

FORWARD

PLAY

SUPPLY

VOLTAGE

OF

BOTH

TORQUE

MOTORS

DURING

RECORDING/PLAYBACK

‘SUPPLY

MOTOR

|

TAKE-UP

MOTOR

Forward

Play

30V

(50

to

70gr)

|}

60V

(210gr)

First

2.5

to

5

sec.

of

normal

or

47V

(100gr)

47TV

(100gr)

reverse

Reverse

Play

60V

(210gr)

|

30V

(50

to

70gr)

RWD.

or

F.

Fwd.

Fig.

3