Akai GX-646 Manuale utente

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2

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AKAI

SAKAI.

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THIS

MANUAL

IS

ALSO

APPLICABLE

TO

BLACK

PANEL

MODELS

SECTION

1

SERVICEMANUAL

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

3

SECTION.2:

.

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LIST

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SECTION

3.

SCHEMATIC

DIAGRAM

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

48

SAFETY

INSTRUCTIONS

A

ee

ee

eee

ee

SAFETY

CHECK

AFTER

SERVICING

Confirm

the

specified

insulation

resistance

between

power

cord

plug

prongs

and

externally

exposed

parts

of

the

set

is

greater

than

10

Mohms,

but

for

equipment

with

external

antenna

terminals

(tuner,

receiver,

etc.)

and

is

intended

for

or

[A],

specified

insulation

resistance

should

be

more

than

2.2

Mohms

(ground

terminals,

microphone

jacks,

headphone

jacks.

line-in-out

jacks

etc.)

PRECAUTIONS

DURING

SERVICING

1.

Parts

identified

by

the

A\

symbol

parts

are

critical

for

safety.

Replace

only

with

parts

number

specified.

2.

In

addition

to

safety,

other

parts

and

assemblies

are

specified

for

conformance

with

such

regulations

as

those

applying

to

spurious

radiation.

These

must

also

be

replaced

only

with

specified

replacements.

Examples:

RF

converters,

tuner

units,

antenna

selector

switches,

RF

cables,

noise

blocking

capacitors,

noise

blocking

filters,

etc.

3.

Use

specified

internal

wiring.

Note

especially

:

1)

Wires

covered

with

PVC

tubing

2)

Double

insulated

wires

3)

High

voltage

leads

4,

Use

specified

insulating

materials

for

hazardous

live

parts.

Note

especially:

1)

Insulation

Tape

2)

PVC

tubing

3)

Spacers

(Insulating

Barriers)

4)

Insulation

sheets

for

transistors.

5.

When

replacing

AC

primary

side

components

(transformers,

power

cords,

noise

blocking

capacitors,

etc.),

wrap

ends

of

wires

securely

about

the

terminals

before

soldering.

c>

—

Observe

that

wires

do

not

contact

heat

producing

parts

(heatsinks,

oxide

metal

film

resistors,

fusible

resistors,

etc.).

Check

that

replaced

wires

do

not

contact

sharp

edged

or

pointed

parts.

Also

check

areas

surrounding

repaired

locations.

Use

care

that

foreign

objects

(screws,

solder

droplets,

etc.)

do

not

remain

inside

the

set.

cde

aera

ee

SECTION

1

SERVICE

MANUAL

TABLE

OF

CONTENTS

T.

sSPECIBICA

TIONS

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IV.

PRINCIPAL

PARTS

LOCATION

.........

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7

V.

VOLTAGE

AND

CYCLE

CONVERSION

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ADJUSTMENT

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2.

TENSION

MICRO

SWITCH

POSITION

ADJUSTMENT

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ROLLER

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4.

REEL

TABLE

HEIGHT

ADJUSTMENT...

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10

5.

CAPSTAN

SHAFT

LOOSE

PLAY

ADJUSTMENT

.......

0.0

cece

ee

eee

eee

entre

ene

10

6.

BRAKE

BAND

POSITION

ADJUSTMENT

AND

BRAKE

TENSION

ADJUSTMENT

...........

11

7.

PINCH

ROLLER

POSITION

ADJUSTMENT

«0...

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8.

PAUSE

PLUNGER

POSITION

ADJUSTMENT

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9.

PINCH

ROLLER

PRESSURE

ADJUSTMENT

....

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12

10.

TAPE

SPEED

ADJUSTMENT

20...

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VII.

HEAD

ADJUSTMENT

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VII.

AMPLIFIER

ADJUSTMENT

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16

IX.

DC

RESISTANCE

OF

VARIOUS

COILS

2.0...

...

ccc

ccc

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19

X.

CLASSIFICATION

OF

VARIOUS

P.C

BOARDS

..

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20

1.

P.C

BOARD

TITLES

AND

IDENTIFICATION

NUMBERS

........

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2.

COMPOSITION

OF

VARIOUS

P.C

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21

For

basic

adjustments,

measuring

methods,

and

operating

principles,

refer

to

GENERAL

TECHNICAL

MANUAL.

I.

SPECIFICATIONS

TRACK

SYSTEM

4

Track

2

Channel

Stereo

System

REEL

CAPACITY

Up

to

10”

reel

HEADS

GX

head

for

Recording

x

2

GX

head

for

Playback

x

2

Erase

head

x

2

MOTORS

AC

Servo

motor

for

capstan

drive

x

1

AC

Eddy

current

motor

for

reel

drive

x

2

TAPE

SPEED

19

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

at

19

cm/s

Less

than

0.04%

WRMS,

0.09%

DIN

45500

at

9.5

cm/s

TAPE

WINDING

TIME

75

sec.

using

360

m

(1,200

ft.)

Tape

FREQUENCY

RESPONSE

25

to

33,000

Hz

+

3

dB

at

19

cm/s

25

to

26,000

Hz

+

3

dB

(0

VU)

25

to

25,000

Hz

+

3

dB

at

9.5

cm/s

25

to

15,000

Hz

+

3

dB

(0

VU)

SIGNAL

TO

NOISE

RATIO

Better

than

65

dB

at

19

cm/s

DIN

45500

HARMONIC

DISTORTION

Less

than

0.4%

at

19

cm/s

INPUT

MIC:

0.25

mV

(input

impedance

5.0

kohms)

Required

microphone

impedance:

600

ohms

Line:

70

mV

(input

impedance

100

kohms)

OUTPUT

Line:

0.775

VatO

VU

Required

load

impedance:

more

than

20

kohms

Phone:

100

mV/8

ohms

at

0

VU

DIN

Input:

2

mV

(input

impedance

10

kohms)

Output:

0.3

V

Required

load

impedance:

more

than

20

kohms

POWER

REQUIREMENTS

100

V,

50/60

Hz

for

Japan

120

V,

60

Hz

for

USA

&

Canada

220

V,

50

Hz

for

Europe

except

UK

240

V,

50

Hz

for

UK

&

Australia

110

V/120

V/220 V/240

V,

50/60

Hz

switchable

for

the

other

countries.

POWER

CONSUMPTION

J75W

C,A

120

W

.

U70W

DIMENTIONS

440

(W)

x

483

(H)

x

256

(D)

mm

(17.3

x

19.0

x

10.1

inches)

WEIGHT

21

kg

(46.4

Ibs)

*

For

improvement

purposes,

specifications

and

design

are

subject

to

change

without

notice.

li.

DISMANTLING

OF

UNIT

In

case

of

trouble,

etc.

necessitating

dismantling,

please

dismantle

in

the

order

shown

in

the

photographs.

Reassemble

in

reverse

order.

1

SIDE

BOARD

6

SCREWS

SCREWS

&

CONTROL

KNOBS

2

7

a:

SCREWS

&

KNOBS

]

PINCH

ROLLER

HEAD

COVER

BASE

SCREWS

8

MECHA

ae

BLOCK

|

UPPER

COVER

SEGENS

AMP

PANEL

BLOCK

|

4

FOOT

q

BOTTOM

PLATE

SCREWS

BACK

BOARD

SCREWS

il.

CONTROLS

Fig.

1

Controls

SUPPLY

REEL

TABLE

19.

REAL

TIME

COUNTER

and

RESET

BUTTON

1.

2.

BUILT-IN

REEL

RETAINER

(Left)

20.

RIGHT

TENSION

ARM

(SENSING

PIN)

3.

PITCH

CONTROL

21.

GUIDE

ROLLER

(Right)

4.

LEFT

TENSION

ARM

(SENSING

PIN)

22.

HEAD

COVER

5.

GUIDE

ROLLER

(Left)

23.

PINCH

ROLLER

6.

RECORDING

MUTE

SWITCH

24.

BIAS

ADJUSTMENT

VOLUME

7.

REELSIZE

SELECTOR

25.

OPERATING

BUTTONS

8.

POWER

SWITCH

;

26.

MEMORY

MARKER

9.

REVERSE

SELECTOR

27.

LINE

INPUT

CONTROLS

10,

VU

METER

(Right)

28.

MICROPHONE

INPUT

CONTROLS

11.

VU

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

IN

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

do

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

:

t

ae

ee

an

MIC

REC

LEVEL

VU

METER|

LINE

VOLUME

L

PHONES

JACK

R

OUTPUT

LEVEL,

CONTROL

_lmic

JACK

VOLUME

TIMER

START

SWITCH

BIAS

ADJUSTMENT

VOLUME

MONITOR

SWITCH

Lt

REC

MODE

SWITCH

-

TAPE

SELECTOR

SWITCH

TAPE

SPEED:

SWITCH

Fig.

2

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

IN

OUT

Fig.3

Rear

View

V.

VOLTAGE

AND

CYCLE

CONVERSION

=

°

FUSE

FI

VOLTAGE

SE

fer

LECTOR

200V

AREA

250V

1.25A

I[OOV

AREA 250V

2.5A

D

POWER

CORD

CYCLE

CHANGE

SWITCH

[ites

swi

_60Hz—50Hz

Fig.4

Voltage

Conversion

(U/T

Model)

and

Cycle

Conversion

(U/T,

JPN

Model)

1.

VOLTAGE

CONVERSION

(Refer

to

Fig.

4)

1)

2)

JPN

Model

(100V,

50/60

Hz)

CSA,

AAL

Model

(120V,

60

Hz)

CEE

Model

(220V,

50

Hz)

UK,

SAA

Model

(240V,

50

Hz)

Voltage

can

not

be

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

on

the

upper

por-

tion

of

the

machine.

Change

the

position

of

voltage

selector

plugs

so

that

the

voltage

to

be

used

coincides

with

the

voltage

shown

through

the

opening

of

voltage

selector

plug.

The

rating

of

fuse

(F1)

differs

depending

on

the

voltage

to

be

used.

Change

the

fuse

according

to

the

specified

rating

shown

below.

110/120

V

Area

250V2.5A

220/240

V

Area

250V1.25A

2.

CYCLE

CONVERSION

(Refer

to

Fig.

4)

Cycle

can

be

converted

only

in

U/T,

JPN

Model.

Remove

the

back

board

and

select

the

position

of

switch

located

in

the

recess

at

right

portion

of

Syscon

P.C

Board

to

correspond

to

the

frequency

of

power

to

bé

used.

Move

the

switch

to

the

right

for

50

Hz

and

to

the

left

for

the

60

Hz.

Vi.

ADJUSTING

WASHER

(U

TYPE)

ADJUSTING

WASHER

(U

TYPE)

.GUIDE

ROLLER

LOOSE

PLAY

ADJUSTMENT

(Refer

to

Fig.

5)

Adjust

the

stopper

(roller

pulley

on

the

right)

screw

(d)

so

that

the

loose

play

gap

is

approximately

0.1

mm

when

the

guide

roller

is

moved

as

indicated

by

arrow

mark

in

Fig.

5.

.

TENSION

MICRO

SWITCH

POSITION

ADJUSTMENT

(Refer

to

Fig.

5)

Adjust

the

screws

(e)

so

that

the

gap

between

the

arm

cam

and

the

micro

switch

is

approximately

0.5

to

0.8

mm.

Check

the

the

micro

switch

works

and

that

the

arm

lock

smoothly

disengages.

TAPE

GUIDE

GUIDE

ROLLER

M

ECHANISM

ADJUSTMENT

al

ae

TENSION

MICRO

SWITCH

Fig.

5

Roller

Block

3.

ROLLER

BLOCK

HEIGHT

ADJUSTMENT

(Refer

to

Fig.

5)

Use

the

U

type

adjusting

washers

for

screws

(a),

(b),

and

(c)

to

adjust

the

roller

block

height:

the

distance

between

the

tape

guide

center

to

the

chassis

board

should

be

43

mm.

NOTE:Steps

1

and

3

also

apply

to

the

right

guide

roller.