Akai GX-646 Manuel utilisateur

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SAKAI.

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STEREO

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movi.GX-646

STEREO

TAPE

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moveLG

X-64:6

THIS

MANUAL

ALSO

APPLICABLE

BLACK

PANEL

MODELS

SECTION

SERVICEMANUAL

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

SECTION.2:

-PAK

LIST

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SECTION

SCHEMATIC

DIAGRAM

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

SAFETY

INSTRUCTIONS

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SAFETY

CHECK

AFTER

SERVICING

Confirm

the

specified

insulation

resistance

between

power

cord

plug

prongs

and

externally

exposed

parts

the

set

greater

than

Mohms,

but

for

equipment

with

external

antenna

terminals

(tuner,

receiver,

etc.)

and

intended

for

[A],

specified

insulation

resistance

should

than

2.2

Mohms

(ground

terminals,

microphone

jacks,

headphone

jacks.

line-in-out

jacks

etc.)

PRECAUTIONS

DURING

SERVICING

Parts

identified

the

symbol

parts

are

critical

for

safety.

Replace

only

with

parts

number

specified.

addition

safety,

other

parts

and

assemblies

are

specified

for

conformance

with

such

regulations

those

applying

spurious

radiation.

These

must

also

replaced

only

with

specified

replacements.

Examples:

converters,

tuner

units,

antenna

selector

switches,

cables,

noise

blocking

capacitors,

noise

blocking

filters,

etc.

Use

specified

internal

wiring.

Note

especially

Wires

covered

with

PVC

tubing

Double

insulated

wires

High

voltage

leads

Use

specified

insulating

materials

for

hazardous

live

parts.

Note

especially:

Insulation

Tape

PVC

tubing

Spacers

(Insulating

Barriers)

Insulation

sheets

for

transistors.

When

replacing

primary

side

components

(transformers,

power

cords,

noise

blocking

capacitors,

etc.),

wrap

ends

wires

securely

about

the

terminals

before

soldering.

—

Observe

that

wires

not

contact

heat

producing

parts

(heatsinks,

oxide

metal

film

resistors,

fusible

resistors,

etc.).

Check

that

replaced

wires

not

contact

sharp

edged

pointed

parts.

Also

check

areas

surrounding

repaired

locations.

Use

care

that

foreign

objects

(screws,

solder

droplets,

etc.)

not

remain

inside

the

set.

cde

aera

SECTION

SERVICE

MANUAL

TABLE

CONTENTS

sSPECIBICA

TIONS

355.0250

025

Hise

Gis

are

bei

eieate:

bis

hat

Wha

B98

coe

Dae

eae

480s

Il.

DISMANTLING

UNIT...

1.0...

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TID.

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sacs

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IV.

PRINCIPAL

PARTS

LOCATION

.........

0. cc

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cere

ener

renee

wren

renees

VOLTAGE

AND

CYCLE

CONVERSION

1.0.0...

cece

ence

renee

ener

eeenoee

VOLTAGE

CONVERSION

2.0...

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ene

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eeeenes

CYCLE

CONVERSION

2.0...

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reer

teen

neers

sees

seeeeeereees

VI.

MECHANISM

ADJUSTMENT

...

1...

cic

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tenet

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teen

nee

GUIDE

ROLLER

LOOSE

PLAY

ADJUSTMENT

1.0...

ccc

cece

eee

eens

TENSION

MICRO

SWITCH

POSITION

ADJUSTMENT

........

0. ee

eee

cree

erevees

ROLLER

BLOCK-

HEIGHT

ADJUSTMENT

03.

c\.a

Casas

cadau

erated

aeaeinls

eee

REEL

TABLE

HEIGHT

ADJUSTMENT...

1...

eee

aes

CAPSTAN

SHAFT

LOOSE

PLAY

ADJUSTMENT

.......

0.0

cece

eee

entre

ene

BRAKE

BAND

POSITION

ADJUSTMENT

AND

BRAKE

TENSION

ADJUSTMENT

...........

PINCH

ROLLER

POSITION

ADJUSTMENT

«0...

ccc

eee

nee

eens

PAUSE

PLUNGER

POSITION

ADJUSTMENT

......

ccc

cece

cee

teen

een

teen

neee

PINCH

ROLLER

PRESSURE

ADJUSTMENT

....

0...

ccc

eee

entrees

10.

TAPE

SPEED

ADJUSTMENT

20...

ccc

cee

eee

een

eee

ennnees

VII.

HEAD

ADJUSTMENT

0...

etre

eet

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renee

ere

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VII.

AMPLIFIER

ADJUSTMENT

10...

eee

een

tener

eres

IX.

RESISTANCE

VARIOUS

COILS

2.0...

...

ccc

etree

eee

tenees

CLASSIFICATION

VARIOUS

P.C

BOARDS

0.0...

ccc

cee

eee

ene

reenes

P.C

BOARD

TITLES

AND

IDENTIFICATION

NUMBERS

........

cee

cece

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teres

COMPOSITION

VARIOUS

P.C

BOARDS

...

0...

cee

eee

nees

For

basic

adjustments,

measuring

methods,

and

operating

principles,

refer

GENERAL

TECHNICAL

MANUAL.

SPECIFICATIONS

TRACK

SYSTEM

Track

Channel

Stereo

System

REEL

CAPACITY

10”

reel

HEADS

head

for

Recording

head

for

Playback

Erase

head

MOTORS

Servo

motor

for

capstan

drive

Eddy

current

motor

for

reel

drive

TAPE

SPEED

cm/s

0.8%

(7-1/2

ips.)

9.5

cm/s

1.0%

(3-3/4

ips.)

WOW

FLUTTER

Less

than

0.03%

WRMS,

0.07%

DIN

45500

cm/s

Less

than

0.04%

WRMS,

0.09%

DIN

45500

9.5

cm/s

TAPE

WINDING

TIME

sec.

using

360

(1,200

ft.)

Tape

FREQUENCY

RESPONSE

33,000

cm/s

26,000

VU)

25,000

9.5

cm/s

15,000

VU)

SIGNAL

NOISE

RATIO

Better

than

cm/s

DIN

45500

HARMONIC

DISTORTION

Less

than

0.4%

cm/s

INPUT

MIC:

0.25

(input

impedance

5.0

kohms)

Required

microphone

impedance:

600

ohms

Line:

(input

impedance

100

kohms)

OUTPUT

Line:

0.775

VatO

Required

load

impedance:

than

kohms

Phone:

100

mV/8

ohms

DIN

Input:

(input

impedance

kohms)

Output:

0.3

Required

load

impedance:

than

kohms

POWER

REQUIREMENTS

100

50/60

for

Japan

120

for

USA

Canada

220

for

Europe

except

240

for

Australia

110

V/120

V/220 V/240

50/60

switchable

for

the

other

countries.

POWER

CONSUMPTION

J75W

C,A

120

U70W

DIMENTIONS

440

(W)

483

(H)

256

(D)

(17.3

19.0

10.1

inches)

WEIGHT

(46.4

Ibs)

For

improvement

purposes,

specifications

and

design

are

subject

change

without

notice.

li.

DISMANTLING

UNIT

case

trouble,

etc.

necessitating

dismantling,

please

dismantle

the

order

shown

the

photographs.

Reassemble

reverse

order.

SIDE

BOARD

SCREWS

CONTROL

KNOBS

SCREWS

KNOBS

]

PINCH

ROLLER

HEAD

COVER

BASE

SCREWS

MECHA

BLOCK

UPPER

COVER

SEGENS

AMP

PANEL

BLOCK

FOOT

BOTTOM

PLATE

SCREWS

BACK

BOARD

SCREWS

il.

CONTROLS

Fig.

Controls

SUPPLY

REEL

TABLE

19.

REAL

TIME

COUNTER

and

RESET

BUTTON

BUILT-IN

REEL

RETAINER

(Left)

20.

RIGHT

TENSION

ARM

(SENSING

PIN)

PITCH

CONTROL

21.

GUIDE

ROLLER

(Right)

LEFT

TENSION

ARM

(SENSING

PIN)

22.

HEAD

COVER

GUIDE

ROLLER

(Left)

23.

PINCH

ROLLER

RECORDING

MUTE

SWITCH

24.

BIAS

ADJUSTMENT

VOLUME

REELSIZE

SELECTOR

25.

OPERATING

BUTTONS

POWER

SWITCH

;

26.

MEMORY

MARKER

REVERSE

SELECTOR

27.

LINE

INPUT

CONTROLS

10,

METER

(Right)

28.

MICROPHONE

INPUT

CONTROLS

11.

METER

(Left)

29.

MICROPHONE

JACKS

(Left/Light)

12.

HEADPHONE

JACK

30.

RECORDING

MODE

SWITCH

13,

OUTPUT

LEVEL

CONTROL

31.

TAPE

SELECTOR

14,

TIMER

START

32.

REMOTE

CONTROL

JACK

15.

MONITOR

SWITCH

33.

LINE

JACKS

16.

TAPE

SPEED

SELECTOR

34.

ACCORD

17,

TAKE-UP

REEL

TABLE

35.

LINE

OUT

JACKS

18.

BUILT-IN

REEL

RETAINER

(Right)

36.

DIN

JACK

(Some

models

not

have

this

facility}

IV.

PRINCIPAL

PARTS

LOCATION

BRAKE

MICRO

SWITCH

Sw906

BRAKE

PLUNGER

PLAY

PLUNGER

SL904

PITCH

CONT

AOE

VOLUME

PAUSE

PLUNGER

SL9OI

REAL

TIME

COUNTER

TENSION

ARM

(R)

TENSION

ARM(L)

REC

MUTE

SWITCH

SW904

REEL

SIZE

SWITCH

SW903

HEAD

BLOCK

REVERSE

SELECTOR

SWITCH

POWER

SWITCH

SW90I

OPERATION

BLOCK

MIC

REC

LEVEL

METER|

LINE

VOLUME

PHONES

JACK

OUTPUT

LEVEL,

CONTROL

_lmic

JACK

VOLUME

TIMER

START

SWITCH

BIAS

ADJUSTMENT

VOLUME

MONITOR

SWITCH

REC

MODE

SWITCH

TAPE

SELECTOR

SWITCH

TAPE

SPEED:

SWITCH

Fig.

Front

View

TIMER

PCB

TIOl4C5010

REMOCON

JACK

USE

PCB

TH-2040

SYSCON

PCB

TH-IOI5

CAPSTAN

MOTOR

OPERATION

PCB{A)

M903

SCM-200

TH-2041

OPERATION

PCB(B).

TH-

2042

PRE

AMP_PCB

TIOOSA5IOA

OUT

Fig.3

Rear

View

VOLTAGE

AND

CYCLE

CONVERSION

FUSE

VOLTAGE

fer

LECTOR

200V

AREA

250V

1.25A

I[OOV

AREA 250V

2.5A

POWER

CORD

CYCLE

CHANGE

SWITCH

[ites

swi

_60Hz—50Hz

Fig.4

Voltage

Conversion

(U/T

Model)

and

Cycle

Conversion

(U/T,

JPN

Model)

VOLTAGE

CONVERSION

(Refer

Fig.

JPN

Model

(100V,

50/60

Hz)

CSA,

AAL

Model

(120V,

Hz)

CEE

Model

(220V,

Hz)

UK,

SAA

Model

(240V,

Hz)

Voltage

can

not

switched.

U/T

Model

(110/120/220/240V,

50/60

Hz)

Remove

the

back

board

and

find

out

the

voltage

selector

and

Fuse

P.C

Board

the

upper

por-

tion

the

machine.

Change

the

position

voltage

selector

plugs

that

the

voltage

used

coincides

with

the

voltage

shown

through

the

opening

voltage

selector

plug.

The

rating

fuse

(F1)

differs

depending

the

voltage

used.

Change

the

fuse

according

the

specified

rating

shown

below.

110/120

Area

250V2.5A

220/240

Area

250V1.25A

CYCLE

CONVERSION

(Refer

Fig.

Cycle

can

converted

only

U/T,

JPN

Model.

Remove

the

back

board

and

select

the

position

switch

located

the

recess

right

portion

Syscon

P.C

Board

correspond

the

frequency

power

bé

used.

Move

the

switch

the

right

for

and

the

left

for

the

Hz.

Vi.

ADJUSTING

WASHER

TYPE)

ADJUSTING

WASHER

TYPE)

.GUIDE

ROLLER

LOOSE

PLAY

ADJUSTMENT

(Refer

Fig.

Adjust

the

stopper

(roller

pulley

the

right)

screw

(d)

that

the

loose

play

gap

approximately

0.1

when

the

guide

roller

moved

indicated

arrow

mark

Fig.

TENSION

MICRO

SWITCH

POSITION

ADJUSTMENT

(Refer

Fig.

Adjust

the

screws

(e)

that

the

gap

between

the

arm

cam

and

the

micro

switch

approximately

0.5

0.8

mm.

Check

the

micro

switch

works

and

that

the

arm

lock

smoothly

disengages.

TAPE

GUIDE

ROLLER

ECHANISM

ADJUSTMENT

TENSION

MICRO

SWITCH

Fig.

Roller

Block

ROLLER

BLOCK

HEIGHT

ADJUSTMENT

(Refer

Fig.

Use

the

type

adjusting

washers

for

screws

(a),

(b),

and

(c)

adjust

the

roller

block

height:

the

distance

between

the

tape

guide

center

the

chassis

board

should

mm.

NOTE:Steps

and

also

apply

the

right

guide

roller.

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