Akai GX-630D User manual

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5

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EEM

AKAI

STEREO

3O0D

DEG

pipe

G2

md

(-6

30

AKAI

STEREO

TAPE

DECK

MopeL

GX-630D

ALSO

APPLICABLE

TO

MODEL

GX-630DB

STEREO

TAPE

DECK

SECTION

1

SERVICE

MANUAL

.……....................……….

1

SECTION

2

PARTS

LIST

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

eneen

25

SECTION

1

SERVIGE

MANUAL

TABLE

OF

CONTENTS

L

SPECIFICATIONS

…

eee

II.

DISMANTLING

OF

UNIT

0e

eneen

ee

III.

ARRANGEMENT

OF

PRINCIPAL

PARTS

…….…..……….

oee

eee

eee

IV.

MECHANISM

ADJUSTMENT

eneen

_

POSITION

ADJUSTMENT

OF

BRAKE

SOLENOID

SL-2

.........

.

BRAKE

TENSION

ADJUSTMENT

.…....

oee

_

POSITION

ADJUSTMENT

OF

PINCH

ROLLER

SOLENOID

SL-l

.…...

‚

PINCH

ROLLER

PRESSURE

ADJUSTMENT

.….........

en

‚

CAPSTAN

SHAFT

LOOSE

PLAY

ADJUSTMENT

nn

.

IMPEDANCE

ROLLER

LOOSE

PLAY

ADJUSTMENT

.…............

.

TAPE

GUIDE

HEIGHT

ADJUSTMENT

neee

.

REEL

TABLE

HEIGHT

ADJUSTMENT

…….…......

eee

_

INSTALLATION

POSITION

ADJUSTMENT

OF

JOINT

B

...........

V.

HEAD

ADJUSTMENT

.........--n

eee

eee

eeen

VI.

AMPLIFIER

SYSTEM

ADJUSTMENT

...........e

ee

eee

1.

D.C

POWER

SUPPLY

VOLTAGE

ADJUSTMENT

enn

2.

TAPE

SPEED

ADJUSTMENT

…......

neee

3.

RECORDING

AND

PLAYBACK

AMPLIFIER

ADJUSTMENT

(GX-630D)

4.

RECORDING

AND

PLAYBACK

AMPLIFIER

ADJUSTMENT

(GX-630DB)

5.

DOLBY

NOISE

REDUCTION

ADJUSTMENT

(GX-630DB)

....………

…

…

VIJL.

D.C

RESISTANCE

OF

VARIOUS

COILS

...

oee

VIII.

CLASSIFICATIONS

OF

VARIOUS

P.C

BOARDS

.…...............…

1.

P.C

BOARD

INTERCHANGEABILITY

CHART

...….

………

oe

2.

COMPOSITE

VIEWS

OF

VARIOUS

P.C

BOARD

.......….

senen

\D

Oo

ANWB

W

ND

vee

eee

eee

ee

ee ee

eee

eee

ee

ee

eee

ee

For

basic

adjustments,

measuring

methods,

and

operating

principles,

refer

to

GENERAL

OPERAT-

ING

PRINCIPLES

AND

ADJUSTMENTS.

|

SPECIFICATIONS

An

asterisk

next

to

a

figure

indicates

the

minimum

guaranteed

performance.

TRACK

SYSTEM

4

track

2

channel

stereo/monaural

system

TEPE

SPEED

T-1/2and

3-3/4

ips

20.7%

*7.1/2

and

3-3/4

ips

+1.0/—1.5%

WOW

AND

FLUTTER

Less

than

0.06%

WRMS

at

7-1/2

ips

Less

than

0.09%

WRMS

at

3-3/4

ips

*Less

than

0.10%

RMS

at

7-1/2

ips

*Less

than

0.15%

RMS

at

3-3/4

ips

TOTAL

WOW

AND

FLUTTER

*Less

than

0.12%

RMS

at

7-1/2

ips

*Less

than

0.18%

RMS

at

3-3/4

ips

FREQUENCY

RESPONSE

30

to

25,000

Hz

+3

dB

at

7-1/2

ips

30

to

19,000

Hz

+3

dB

at

3-3/4

ips

(with

AKAI

LN-150-7

Tape)

|_*30

to

22,000

Hz

+3

dB

at

7-1/2

ips

In

*30

to

18,000

Hz

+3

dB

at

3-3/4

ips

HARMONIC

DISTORTION

Less

than

0.5%

TOTAL

HARMONIC

DISTORTION

zi

*Less

than

1.5%

SIGNAL

TO

NOISF

RATIO

Better

than

50

dB

TOTAL

SIGNAL

TO

NOISE

RATIO

*Better

than

47

dB

|

*0.775V

(0

dBm

+10

dB)

30

mV

at

8

ohm

At

playback

of

a

700

Hz

“0”

VU

pre-recorded

test

tape.

|_(Output

Volume

at

maximum)

OUTPUT

LINE

HEADPHONE

INPUT

MIC

LINE

DIN

INPUT/OUTPUT

RECORDING/PLAYBACK

LEVEL

CROSS

TALK

ERASE

RATIO

RECORDING

BIAS

FREQUENCY

BIAS

LEAK

«

HIGH

FREQUENCY

DEVIATION

More

than

0.25

mV/10

k

ohm

More

than

70

mV/150

k

ohm

At

“0”

VU

output.

(Recording

Volume

at

maximum)

0.25

mV/0.5V

*0.775V

(O

dBm

+1.5

dB)

Better

than

45

dB,

stereo

Better

than

55

dB,

monaural

dez

RECORDING

TIME

Better

than

70

dB

100

kHz

+5%

Better

than

—30

dB

(GX-630D)

Better

than

—50

dB

(GX-630DB)

Within

3

dB

At

playback

of

an

8,000

Hz

3-3/4

ips

pre-recorded

tape

at

7-1/2

ips

180

min

stereo

recording

at

7-1/2

ips,

using

a

3,600

ft

tape.

F.FWD

AND

RWD

TIME

Approximately

2

min

and

40

sec

at

50

Hz,

using

a

3,600

ft

tape.

MOTOR

MAIN

MOTOR

REEL

MOTOR

2

speed

AC

servo

control

outer

rotor

motor

Type:

SCM2-24KJ

4

pole

Revolutions:

615

rpm

at

7-1/2

ips

(19

cm/sec)

307.5

rpm

at

3-3/4

ips

(9.5

cm/sec)

6

pole

eddy

current

outer-rotor

motor

{_

Type:

24XO-TD

Revolutions:

930

rpm

at

50

Hz

1,120

rpm

at

60

Hz

HEAD

ERASE

HEAD

RECORDING

HEAD

PLAYBACK

HEAD

Type:

E4-260

Gap:

double

gap

Impedance:

210

ohm

+10%

at

100

kHz

D.C

Resistance:

2

ohm

Type:

R4-200

Gap:

4

micron

Impedance:

1,870

ohm

at

100

kHz

‚_D.C

Resistance:

8

ohm

__

Type:

P4-202

‚Gap:

1.7

20.5

micron

£__Impedance:

1,400

ohm

at

1

kHz

D.C

Resistance:

268

ohm

TRANSISTOR

&

FET

2SA56HQ(R)

.…

1(5)

2SC1247A(B(V)

...

2(2)

2SC458(C)

..

.

(12)

2SD361(D)(D2)

…

11)

2SC458LG(C)

.…….

16(32)

TIP47

….

1)

2SCT1(F)(G)

.….

2(2)

2SK30A(GR)

...

0(4)

2SC945L(QHP)

.….

22(22)

DIODE

IN34A

...

26)

10D2...4(4)

IN4001

...

4(4)

WZ075

.….

2(2)

IN4004

...

6(6)

WZO085

...

0(4)

181588...

1(1)

WZ192...1(1)

182473...

21(21)

RDS5A(M)

.…

.

1(1)

182473VE...

16(28)

POWER

REQUIREMENT

AND

CONSUMPTION

100

to

240V

AC

50/60

Hz,

90W

(Universal

Models)

220V

AC

50

Hz,

100W

(CEE

Models)

120V

AC

60

Hz,

90W

(CSA

Models)

100V

AC

50/60

Hz,

70W

(JPN

Models)

eet

8

DIMENSIONS

465(H)

x

440(W)

x

240(D)

mm

(18.3

x

17.4”

x

9.4”)

Dimensions

include

all

protruding

parts.

WEIGHT

GX-630D:

19

kg

(41.8

Ibs)

GX-630DB:

19.5

kg

(42.9

Ibs)

NOTES:

1.

Specifications

determined

with

SCOTCH

#211

Tape

unless

otherwise

noted.

2.

Specifications

subject

to

change

without

notice.

3.

The

numbers

shown

in

parentheses

in

Items

TRANSISTOR

&

FET

and

DIODE

are

applicable

to

Mode!

GX-630DB.

Il

DISMANTLING

OF

UNIT

In

case

of

trouble,

etc.

necessitating

disassembly,

please

disassemble

in

the

order

shown

in

photographs.

Reassemble

in

reverse

order.

CONTROL

KNOBS,

ARMS

AND

PINCH

ROLLER

SCREWS

SCREWS

II

ARRANGEMENT

OF

PRINCIPAL

PARTS

De

On

BRAKE

HOLD

MICRO

SWITCH

SW-8,SW-9

PINCH

ROLLOR

SOLENOID

SL-

|

ij

MPEDANCE

ROLLER

HEAD

BLOCK

TENSION

MICRO

REEL

SIZE

SW-3

SWITCH

SW-

7

TAPE

SPEED

SW-2

PAUSE

MICRO

SWITCH

SWw-5

POWER

SW-l

REEL

SIZE

SW-4

PUSH

BUTTON

MONITOR

SW

-|

PAUSE

MICRO

SWITCH

Sw-6

RIGHT

REEL

MOTOR

24x0-

TD

LEFT

REEL

MOTOR

24x0-

TD

SERVO

PC

BOARD

begi

RELAY

PC

BARD

TE-2002

MAIN

MOTOR

SCM2-24KJ

SYS-CON

P.C

BOARD

TE-

2001

REC

AMP

P.C

BOARD

Niv

8018

RB

AMP_RC

(DARD

MY

-

5017

IV

MECHANISM

ADJUSTMENT

SPRING

RACK

MICRO

SWITCH

SW-8,SW—9

BRAKE

LEVER

SPRING

BRAKE

BAND

LEVER

al

Se

Nn

bÂ

BRAKE

LEVER

B

Gal

bl

BRAKE

SOLENOID

SL—2

|

|

BRAKE

BAND

LEVER

BRAKE

BAND

SUPPORT

BRAKE

BAND

SUPPORT

BRAKE

LEVER

A

Fig.

1

BRAKE

DRUM

BRAKE

BAND

GUIDE

BRAKE

LEVER

CLOTH

TAPE

BRAKE

BAND

BRAKE

BAND

GUIDE

Fig.

2

1.

POSITION

ADJUSTMENT

OF

BRAKE

SOLENOID

SL-2

(Refer

to

Figs.

1,

2)

1)

Adjust

left/right

Brake

Band

Support

positions

so

that

at

stop

mode,

Brake

Lever

A

and

Brake

Lever

B

display

180°

angle

relativity.

2)

Under

the

conditions

described

in

1)

above,

adjust

installation

angle

position

of

Microswitches

SW-8

and

SW-9

so

that

the

clearance

between

the

brake

.

lever

and

brake

band

lever

is

1.5

mm.

3)

Adjust

installation

position

of

the

Brake

Solenoid

so

that

at

playback

mode,

the

brake

band

sepa-

rates

from

the

brake

drum.

2.

BRAKE

TENSION

ADJUSTMENT

(Refer

to

Figs.

1,

2)

1)

Adjust

installation

position

of

the

Spring

Rack

so

that

brake

tension

is

500g.

2)

After

brake

tension

adjustment,

adjust

installation

position

of

the

Brake

Band

Guide

so

that

at

all

modes

except

stop

mode,

the

brake

band

com-

pletely

separates

from

the

cloth

tape

on

the

brake

drum.

PINCH

ROLLER

SOLENOID

SL--|

PLUNGER

PULL

BAR

PINCH

ROLLER

PRESSURE

ADJUSTMENT

NUT

14Kg

PINCH

ROLLER

Fig.

3

3.

POSITION

ADJUSTMENT

OF

PINCH

ROLLER

SOLENOID

SL-1l

(Refer

to

Fig.

3)

I)

Insert

a

4

mm

thickness

gauge

(A

U

type

washer

can

be

substituted)

between

the

Pull

Bar

and

Pinch

Roller

Arm.

5

2)

Set

the

deck

to

playback

mode,

and

fix

Pinch

Roller

Solenoid

at

position

at

which

pinch

roller

begins

to

rotate.

THRUST

SUPPORT

ANGLE

4.

PINCH

ROLLER

PRESSURE

ADJUST-

MENT

(Refer

to

Fig.

3)

Adjust

Pinch

Roller

Pressure

Adjustment

Nut

so

that

pinch

roller

pressure

is

1.4

kg.

NOTE:

To

measure

pinch

roller

pressure,

pull

the

pinch

roller

away

from

capstan

with

a

spring

gauge

and

gently

return.

Spring

Gauge

indi-

cation,

at

the

time

the

pinch

roller

contacts

the

capstan

and

the

capstan

begins

to

rotate,

should

be

1.4

kg.

CAPSTAN

SHAFT

Fig.

4

5.

CAPSTAN

SHAFT

LOOSE

PLAY

ADJUST-

MENT

(Refer

to

Fig.

4)

Adjust

to

obtain

a

clearance

of

0.1

mm

between

the

Capstan

Shaft

and

Thrust

Support

Angle.

IMPEDANCE

ROLLER

6.

IMPEDANCE

ROLLER

LOOSE

PLAY

AD-

Fig.

5

JUSTMENT

(Refer

to

Fig.

5)

Adjust

Screws

A

and

B

so

that

impedance

roller

loose

play

is

0.1

mm.

NOTE:

Confirm

that

the

screws

are

tight

following

this

adjustment.

TAPE

GUIDE

TAPE

TENSION

ARM

ADJUSTMENT

WASHER

ADJUSTMENT

WASHER

CD

%

LOWER

THE

GUIDE

DOWN

A

LITTLE

%

LIFT

THE

GUIDE

UP

A

LITTLE

Fig.

6

TAPE

GUIDE

ADJUSTMENT

WASHER

Olt

Be

KE

ED

SATAII

Ce,

re,

Fig.

7

7.

TAPE

GUIDE

HEIGHT

ADJUSTMENT

(Refer

to

Figs.

6.

7)

Adjust

tape

guide

height

so

that

the

tape

does

not

curl

between

the

tape

guide

and

guides

on

head

base.

NOTE:

As

left

and

right

tape

guide

height

adjust-

ment

methods

are

different.

be

sure

to

refer

to

Figs.

6,

and

7.