Akai GX-77 User manual

Other manuals for GX-77

4

Table of contents

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STEREO

TAPE

DECK

eens

X=

i

Ai

THIS

MANUAL

IS

ALSO

APPLICABLE

TO

BOTH

SILVER

AND

BLACK

PANEL

MODELS

SECTION

1

SERVICE

MANUAL

.................-4-

3

SECTION

2

PARTS

LIST

32...

csc

ce

ca

eewen

ved

45

SECTION

3

SCHEMATIC

DIAGRAM

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

65

SAFETY

INSTRUCTIONS

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.

0

|

ID

Parts

identified

by

the

A\

symbol

parts

are

critical

for

safety.

Replace

only

with

parts

number

specified.

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.

Use

specified

internal

wiring.

Note

especially:

1)

Wires

covered

with

PVC

tubing

2)

Double

insulated

wires

3)

High

voltage

leads

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

When

replacing

AC

primary

side

components

(transformers,

power

cords,

noise

blocking

capacitors,

etc.),

wrap

ends

of

wires

securely

about

the

terminals

before

soldering.

c>

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.

I.

SPECIFICATIONS

TRACK

SYSTEM

REEL

CAPACITY

HEADS

MOTORS

TAPE

SPEED

WOW

&

FLUTTER

TAPE

WINDING

TIME

FREQUENCY

RESPONSE

(Using

a

EE

Tape)

SIGNAL

TO

NOISE

RATIO

HARMONIC

DISTORTION

INPUT

OUTPUT

DIN

DIMENSIONS

WEIGHT

POWER

REQUIREMENTS

POWER

CONSUMPTION

4

Track

2

Channel

Stereo

System

Up

to

7”

reel

GX

head

for

Recording

x

2

GX

head

for

Playback

x

2

Erase

head

x

2

FG

Servo

DC

motor

for

capstan

drive

x

1

DC

motor

for

reel

drive

x

2

19

cm/s

+

0.8%

(7-1/2

ips.)

9.5

cm/s

+

1.0%

(3-3/4

ips.)

Less

than

0.03%

WRMS,

0.07%

DIN

45500

at

19

cm/s

Less

than

0.04%

WRMS,

0.10%

DIN

45500

at

9.5

cm/s

80

sec.

using

360

m

(1200

ft.)

tape

25

to

33,000

Hz

+

3

dB

(-20

VU)

at

19

cm/s

25

to

26,000

Hz

+

3

dB

(0

VU)

at

19

cm/s

25

to

25,000

Hz

+

3

dB

(-20

VU)

at

9.5

cm/s

25

to

15,000

Hz

+

3

dB

(0

VU)

at

9.5

cm/s

Better

than

63

dB

at

19

cm/s

DIN

45500

Less

than

0.5%

at

19

cm/s

Required

microphone

impedance:

600

ohms

Line:

70

mV

(input

impedance

47

kohms)

Line:

0.775V

at

0

VU

Required

load

impedance:

more

than

20

kohms

Phone:

1.3

mV/8

ohms

at

0

VU

Input:

2.0

mV

(input

impedance

10

kohms)

Output:

0.3V

Required

load

impedance:

more

than

20

kohms

440(W)

x

244(H)

x

227(D)

mm

(17.3

x

9.6

x

8.9’)

17.0

kg

(37.5

Ibs)

100V,

50/60

Hz

for

Japan

120V,

60

Hz

for

USA

and

Canada

220V,

50

Hz

for

Europe

except

UK

240V,

50

Hz

for

UK

and

Australia

110/120/220/240V,

50/60

Hz

switchable

for

the

other

countries

JPN

30W

U/T,

CSA,

AAL

SOW

*

For

improvement

purposes,

specifications

and

design

are

subject

to

change

without

notice.

SECTION

1

SERVICE

MANUAL

TABLE

OF

CONTENTS

SPECIFICATIONS

5.3

f0:3h

0

site

ives

fota

no

AM

EA,

ei

teca

a

Na

Se

sei

DISMANTLING

OF

UNIT...

2.0.0.0...

ee

ee

ee

ens

CONTROLS

©

i532,

505

tiny

eSieeals

BS

eters

era

BALE

Gene

ote Ges

BE

a

PRINCIPAL

PARTS

LOCATION

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

0...

0c

cee

ee

eee

eee

VOLTAGE

AND

CYCLE

CONVERSION.

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

0.000220

ee

1.

VOLTAGE

CONVERSION

...........

0.0.0

cece

eee

eee

2.

CYCLE

CONVERSION

}j

oo

sscis

a

ceed

i

ee

wens

Me

Ewe

ae

VI.

OPERATING

PRINCIPLES

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

2.0.0

cece

eee

eee

1.

TIMING

CHART

OF

EACH

MODE

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

2.200000

e

eens

2.

EXPLANATION

OF

EACH

MODE...............

000000

e

ee eee

3.

EXPLANATION

OF

EACH

CIRCUIT

................0

0.00005,

VII.

MECHANISM

ADJUSTMENT

.........

0.00.

ccc

cece

ee

eee

eee

1.

BRAKE

BAND

POSITION

ADJUSTMENT

AND

BRAKE

TENSION

ADJUSTMENT

...........

2.

PLAY

PLUNGER

POSITION

ADJUSTMENT

.................45.

3.

PINCH

ROLLER

PRESSURE

ADJUSTMENT

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

4.

TENSION

SERVO

ADJUSTMENT

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

0...

eee

eens

5

6

<295>

.

LOADER

PLUNGER

POSITION

ADJUSTMENT

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

.

TAPE

SPEED

ADJUSTMENT

....

2...

0...

cece

ees

.

HEAD

ADJUSTMENT

...

10...

0...

cc

ec

ee

eens

AMPLIFIER

ADJUSTMENT

....

2.0.2...

cc

ccc

ee

eens

DC

RESISTANCE

OF

VARIOUS

COILS

...........

0.0.2.

ee

eens

CLASSIFICATION

OF

VARIOUS

P.C

BOARDS

................06.

1.

P.C

BOARD

TITLES

AND

IDENTIFICATION

NUMBERS...........

2.

COMPOSITION

OF

VARIOUS

P.C

BOARDS

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

HeR

For

basic

adjustments,

measuring

methods,

and

operating

principles,

refer

to

GENERAL

TECHNICAL

MANUAL.

SCREWS

lil.

CONTROLS

OS

eS

re

=~SOONDAHRWON>OO

DSS

OVE

AN

POWER

SWITCH

SUPPLY

REEL

TABLE

REEL

STOPPER

TENSION

ARM

CAPSTAN

HEAD

COVER

REAL

TIME

COUNTER

and

RESET

BUTTON

PINCH

ROLLER

TENSION

ARM

REEL

STOPPER

.

TAKE

UP

REEL

TABLE

.

TIMER

START

SELECTOR

REVERSE

(REV)

SELECTOR

.

HEADPHONE

(PHONES)

JACK

OUTPUT

CONTROL

RECORDING

INPUT

CONTROLS

(REC-L,

REC-R)

.

MONITOR

SELECTOR

BIAS

ADJUSTMENT

(ADJUST)

CONTROL

RECORDING

(REC)

MASTER

CONTROL

-

TAPE

SELECTOR

.

TAPE

SPEED

SELECTOR

22.

23.

24.

25.

26.

27.

28.

29.

30.

31.

32.

33.

DIGITAL

BAR

METERS

CUE/REVIEW

LEVER

LOADING

ROLLER

UP/DOWN

BUTTON

OPERATION

BUTTONS

RECORDING

BUTTON

(@

REC)

and

INDICATOR

PAUSE

BUTTON

(

88)

and

INDICATOR

REVERSE

BUTTON

{

«

}

FORWARD

BUTTON

(

»

}

REWIND

BUTTON

(

~e<«

)

STOP

BUTTON

(

@

)

FAST

FORWARD

BUTTON

(

=

)

STANDBY/DIRECTION

INDICATORS

(

<¢

and

»)

REMOTE

CONTROL

JACK

EXTERNAL

POWER

SUPPLY

JACK

(INPUT

DC

15V

200

mA)

POWER

CORD

LINE

IN

JACKS

LINE

OUT

JACKS

LOADING

ROLLER

SENSING

PINS

DIN

JACK

(Some

models

do

not

have

this

facility}

i.

DISMANTLING

OF

UNIT

In

case

of

trouble,

etc.

necessitating

dismantling,

please

dismantle

in

the

order

shown

in

the

photographs.

Reassemble

in

reverse

order.

SCREWS

SCREWS

anos

=e

Gl

eee

SCREWS

SCREWS

GEE)

2

BOTTOM

COVER

SCREWS

SCREWS

SCREWS

BACK

BOARD

SCREWS

IV.

PRINCIPAL

PARTS

LOCATION

HEAD

BLOCK(REV)

HEAD

BLOCK(FWD)

TENSION

COUNTER

PCB

LOADER

SWITCH

TENSION

ARMI(L)

TIO1005220

Sw305

ARMIR)

REC

R

INPUT

CONTROLS

,

POWER

Swi

TCH—>

|

PHONES

4

:

OUTPUT

LEVEL

CONTROL

MONITOR

SWITCH

BIAS

ADJUSTMENT

CONTROL

REC

MASTER

CONTROL

LOADING

ROLLER

OPERATION

BLOCK

LOADING

ROLLER

UP/DOWN

BUTTON

CUE/REVIEW

LEVER

TAPE

SPEED

SWITCH

TAPE

SELECTOR

Fig.2

Front

View

i

}

be

|

REMOCON

JACK

AC

ADAPTER

JACK

Ji

J9OI

Fig.3

Rear

View

Fig.

1

Controls

TA

AT

MN

IN

A

PANY

ON

I

ease

soe

win

VI.

OPERATING:

PRINCIPLES

A3a

10

OM3

>

Bd

Y3BWIL

A348

19

OMS

CuO

33y

°

:33yN

BIW

ZuL

PTE

bs

YL

OLOHG

3S81Md

3d¥i

Of

ry

6

elal

Ht

Yui

O10Hd

NMOO/dN

oi

!

Zz

6

ec

MS

AIX

NOILVYVIdO

:dO

ze

oD

“sv

TN

9¢

ei-se\

|

/

Van

a

SNISNIS

2

ow

A

1

omsnas\L/

ssn

uw

°

«

ta

(43073)

zai

bHOLV?

£0

P

|

LN3W93S

Ci)

aaa

OD

037

€H21v7

(ma)

a

—

ZHILVT

Co)

7

238

Fb

rs

AOI+0

=

é

“ae

ov

asnva

”

Ais

O

ML'b

eevoogeeen

I

41437

YOLOW

13348

4H914

YOLOW

1334a

pa

Pr

PJ

rT

pe

|

02

dN

wove

NO1L93410

———>2-IMS

dV

3u0

(1331)

yOLON

(1H91tu)

HOLON

3OV1IOA

HOI

10

Ce

‘ztuL

91d

430V07

A3u

Oma

3LNW

8'g

—————_|}+——>

anv

ud

a0

31NW

339

————___—_—-

WV

3ud

3AteG

250

—>[_etur

pean

3ud

of

62aL

91d

axvad

MS

G10H

¥Y3IONNId

JNVUB

vO6-1S

1sv4

4Oe

ZHHOOw=4

ISO

doo!

AOI+

39V110A

MOT

Fig.5

Syscon

Block

Diagram

10

V.

VOLTAGE

AND

CYCLE

CONVERSION

POWER

TRANS

TSO!

VOLTAGE

SELECTOR

VS

|

@|

a

AC

CORD

Fig.4

Voltage

Conversion

(U/T

Model

Only)

.

VOLTAGE

CONVERSION

Models

for

Canada,

Europe,

USA,

UK,

Australia

and

Japan

are

not

equipped

with

this

facility.

Each

machine

is

preset

at

the

factory

according

to

destination,

but

some

machines

can

be

set

to

110V,

120V

or

240V

as

required.

If

voltage

change

is

necessary,

this

can

be

accom-

plished

as

follows:

1)

Remove

the

back

board

and

look

for

the

voltage

selector

on

the

center

portion

of

the

machine.

2)

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.

oe

rm

.

CYCLE

CONVERSION

With

DC

motor,

cycle

conversion

is

not

necessary.

A

ence,

“oO