Akai X-165D Manuel utilisateur

TABLE

CONTENTS

SPECIPICALIONS

MEASURING

METHOD

3.0650

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Sete

CONTROL:

LOCATIONS

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DISASSEMBLY

TAPE

TRANSPORT

UNITS

AMPUIPIPRS

Sito

tie

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TRANSPORT

MECHANISM

ADJUSTMENT

AMPLIFIER

ADJUSTMENT

MAIN

FENANCE

PROCEDURE:

iu5.

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COMPOSITE

VIEWS

COMPONENTS

TROUBLE

SHOOTING

CHART

SCHEMATIC

DIAGRAM

* *

. *

« *

* .

« *

° * .

. . *

* *

* . * .

* * *

° « . .

. .

When

placing

order

for

parts,

please

use

separate

PARTS

LIST

PRICE

LIST

FOR

PARTS.

SPECIFICATIONS

RECORDIING

SYSTEM

Cross-Field

Head

recording

system.

PLAYBACK

SYSTEM

In-Line

track

stereo/monaural

play-

back

system.

TAPE

SPEED

1-7/8,

3-3/4,

7-1/2

ips

(15

ips

op-

tional)

TAPE

SPEED

DEVIATION

Within

1.5%

all

tape

speeds.

WOW

AND

FLUTTER

Less

than

0.15%

r.m.s

7-1/2

ips.

(Playback

only)

Less

than

0.20%

r.m.s

3-3/4

ips.

Less

than

0.30%

r.m.s

1-7/8

ips.

FREQUENCY

RESPONSE

22,000

7-1/2

ips.

(+3

dB)

18,000

3-3/4

ips.

9,000

1-7/8

ips.

SIGNAL

NOISE

RATIO

Better

than

DISTORTION

With

1,000

OVU

recording.

CROSS

TALK

Less

than

—65dB

(Monaural)

Less

than

—43

(Stereo)

ERASE

RATIO

Less

than

—70

for

all

tracks

EQUALIZATION

Correct

equalization

for

playback

tapes

recorded

the

NAB

curve.

RECORDING

BIAS

FREQUENCY

60kHz

kHz

1.228

(+4dB)

using

250

OVU

recorded

tape.

Required

Load

Impedance...

than

k-Ohms

OUTPUT

(LINE)

DIN

OUTPUT

0.4

(—6

dB)

using

250

OVU

recorded

tape.

Impedance

k-Ohms.

Required

Load

Impedance...

than

k-Ohms

INPUT

LEVEL

Line...20mV

(—32dB)

2.5

(10

dB)

Impedance

390

k-Ohms

Mic

0.5mV

(—64dB)

50mV

(—25

dB)

Impedance...

k-Ohms

High

...more

than

(—32

dB)

Impedance

390

k-Ohms

Low

...more

than

(—44

dB)

Impedance

k-Ohms

F.FORWARD

AND

REWIND

TIME

seconds

using

1,200

ft.

tape

Hz,

seconds

HEAD

PHONE

OUTPUT

~40

Impedance

100

240

AC,

50/60

DIN

INPUT

LEVEL

POWER

SUPPLY

POWER

CONSUMPTION

S55

INSULATION

RESISTANCE

than

M-Ohms

In-Line

track

stereo/manaural

MOTOR

Hysteresis

synchronous

speed

motor.

Horse

Power...

1/100

Power

Ratio...

85%

Revolution

...

3,000

and

1,500

r.p.m.

50Hz.

3,600

and

1,800

r.p.m.

Condenser

capacity

...

2.8

2.0

HEADS

Recording/playback

head

Track

Gap

microns

Impedance

...

1.2

k-Ohms

1,000

Bias

head

Track

...

Gap

0.2

Impedance

...

500

Ohms

kHz

ERASE

head

Track

...

Gap

0.2

Impedance

...

500

Ohms

RECORD

LEVEL

INDICATOR

Vertical

indication

Model

‘‘A”’

meter

TRANSISTORS

USED

2SC650

(A)

2SC281

(B)

2SC458

(B)

28C971

(2)(3)

DIODES

USED

IN34A

SW-05-02

STYLE

Portable

DIMENSIONS

13-1/2"

(H)

13-1/2”

(W)

(D)

(340

340

230

mm)

WEIGHT

30.8

lbs

(14

kg)

Wl.

MEASURING

METHOD

TAPE

SPEED

DEVIATION

Method

involving

use

pre-recorded

tape.

For

measuring

the

tape

speed

deviation,

play

back

pre-recorded

tape

1,000Hz

0.1%.

Connect

the

appropriate

output

frequency

counter

meter

order

measure

the

tape

speed

deviation

from

the

pre-recorded

tape.

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

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-165D

Set

the

Equalizer

Switch

“7-1/2”

ips

position

and

playback

tape

containing

250

sine

wave

recorded

“0”

level

standard

recorder.

Connect

V.T.V.M.

the

line

output

jack

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.

TOTAL

HARMONIC

DISTORTION

FACTOR

kHz

Audio

Distortion

Oscillator

Meter

Connect

the

measuring

instrument

shown

above,

and

record

1,000

sine

wave

“OQ”

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

can

obtained

from

the

results

the

above

measurement

the

following

formula.

d—d,

—d,

where,

Required

Overall

distortion

factor

Noise

level

Distortion

factor

the

oscillator

(Note

New

tape

particularly

good

quality

should

used

for

measurement

the

distortion

factor.)

POWER

OUTPUT

Playback

tape

containing

250

sine

wave

recorded

standard

recorder.

Connect

V.T.V.M.

the

line

output

jack

the

recorder

and

measure

the

voltage

the

output

the

recorder

tested.

eee

CROSSTALK

(Crosstalk

between

the

tracks)

(TAPE)

}

BRA

AICS

Tape

direction

@—-+(WW

wut

Roe

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

track

No.3

and

No.

(reversed

condition

tape)

through

the

1,000

B.P.F.

(Band

Pass

Filter,

Sensitivity

...

and

obtain

ratio

between

the

two

from

the

following

formula.

201

E,_E,

(dB)

=Desired

crosstalk

ratio

(dB)

1,000

signal

output

level

TOTTI

1,000

crosstalk

output

level

reer

=No-input

signal

record

level

FREQUENCY

RESPONSE

Audio

Frequency

F-

Oscillator

Connect

the

measuring

instrument

shown

the

above

diagram,

and

measure

the

frequency

response

according

the

following

sequence

RECORD

Supply

sine

wave

1,000

the

Line

Input

the

recorder

being

tested,

through

attenuator

from

audio

frequency

generator.

Set

the

Mode/Selector

Lever

“Rec”

position

and

adjust

the

line

input

volume

that

the

meter

needle

indicates

“0”

VU.

Under

the

condition

described

(2),

lower

the

input

level

with

the

attenuator.

Record

the

spot

frequency

from

the

audio

frequen-

generator

the

range

25,000

Hz.

PLAYBACK

Set

the

Equalizer

Switch

7-1/2”

3-3/4”.

Connect

V.T.V.M.

the

Line

output.

Playback

the

previously

recorded

tape.

Adjust

the

output

level

“O”

dBm

1,000

(indicated

the

V.T.V.M.

Range

selector)

Playback

the

recorded

spot

frequencies

under

the

conditions

(8),

make

memo

Output

Level,

and

plot

the

value

graph.

Ree}

Retainer

(Left)

Speed

Change

Switch

Supply

Reel

Shaft

Take-Up

Reel

Shaft

Cycle

Conversion

Switch.

‘A)

Reel

Retainer

(Right)

Capstan

Storage

Post-

tation.

WCU

Vapstan

Shaft

Track.

Selector

Knob

Capstan

Head

Cover.

(A)

Pinch

Wheel

Tape

Guide

Automatic

Shut-

Off

Lever

Tape

Cleaner

Record/Playback

Knob

Tape

Cleaner

Release

Button

Pause

Lever

Index

Counter

Reset

Button

Fast-Forward/Rewind

Knob

;

Head

Cover

Recording

Level

Control

Knob

(Right

—Recording

Safety

Buttc

ron

Automatic

Shut-Off

Switch

Equalizer

Switch

Recording

Lamp

Microphone

Jack

‘Left)

Stereo

Headphone

Jack

Microphone

Jack.

(Right)

Recording

Level

Control

Knob

(Left)

Meter.

(Right)

Power

Switch

“VU

Meter

CUE

RLS:

—Fuse

Post

Voltage

Selector

Cycle

Conversion

Switch

(B)

Cord

DIN

Jack

and

High/Low

Input

Selector

Switch

Line

Input

Jack

(Left)

Line

Output

Jack

(Left)

Line

Output

Jack

(Right)

Line

Input

Jack

(Right)

case

trouble,

etc.

necessitating

disassembly,

please

disassemble

the

order

shown

photographs.

Reas-

semble

reverse

order.

CAPS

PINCH

WHEEL

PINCH

WHEEL

gMECH.

PANEL

psp

“AMP

BLOCK

CAPSTAN

DRIVE

Figure

(A)

Motor

(B)

Drive

Belt

(flat

belt)

(C)

Capstan

(D)

Flywheel

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”

(4.74

cm)

per

sec.

Motor

Rotation

3,000

1,500

R.P.M.

3,600

1,800

R.P.M.

kHz

PINCH

WHEEL

DRIVE

Place

tape

between

the

rotating

capstan

and

pinch

wheel

and

push

pinch

wheel

against

capstan

transport

the

tape

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)

Slipping

Rotation

;

“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)

has

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

Interlock

Button

(F)

must

depressed

before

the

RECORD/PLAYBACK

LEVER

can

moved

the

“REC’’

position.

Safety

device

(G)

depressed

operate

the

recording

mecha-

nism.

(See

figure

AWWA

FAST-FORWARD

MECHANISM

Turning

the

FAST

FWD-REWIND

knob

(A)

“FAST

FWD”’

position,

causes

the

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

(1)

comes

off

the

reel

spindle

free

the

Supply

Reel

Spindle

(G),

thereby

allowing

fast

winding

the

tape

onto

the

take-up

reel.

(See

figure

Free

Rota

REWIND

MECHANISM

Turning

the

FAST

FWD-REWIND

knob

(A)

“RE-

WIND”

position,

causes

the

cam

(B)

under

the

knob

push

Lever

(C)

up.

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

ODF

{

—

the

intermediate

pulley

the

Supply

Reel

Spindle

(G).

eee

the

same

time,

Brake

Rollers

(H)

and

(1)

come

off the

reel

spindle

free

the

take-up

reel

spindle

(J),

thereby

rewinding

the

tape

onto

the

supply

reel

fast

speed.

(See

figure

Free

Rotation

thee

deo

RAL

pte

Fig.

serena

oo)

STOP.

CONTROL

gee

ree

newine

Turning

the

stop

lever

the

“STOP”

position,

causes

foo

lerwheel

Brake

Rollers

(A)

and

(B)

depress

the

reel

spindles

and

stop

rotation.

the

brake

rubbers

depress

the

plastic

rollers

below

the

reel

spindles,

friction

applied

the

tape.

(A)

“(See

figure

side

Brake:

ace

|Idlerwheel

;

‘C

See

eas

-Capstany

Head

fER

Saee

Block

Pinch

(CaM)

Guide--Roller:

Genes

Wai

eee

wee)

ies

ete

Pinch

Take-up

Rewind

Take-up

Supply

Modes

Operation

Wheel

Idler

side

Wheel

Brake

(a)

STOP

(b)

FAST-FORWARD

(c)

REWIND

RECORDING

;

(2)

PLAYBACK

NOTES

X-Marks

indicate

“open”

and

o-marks

“engaged”

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