Akai GX-77 Manuel utilisateur

STEREO

TAPE

DECK

eens

THIS

MANUAL

ALSO

APPLICABLE

BOTH

SILVER

AND

BLACK

PANEL

MODELS

SECTION

SERVICE

MANUAL

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

SECTION

PARTS

LIST

32...

csc

eewen

ved

SECTION

SCHEMATIC

DIAGRAM

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

SAFETY

INSTRUCTIONS

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.

SPECIFICATIONS

TRACK

SYSTEM

REEL

CAPACITY

HEADS

MOTORS

TAPE

SPEED

WOW

FLUTTER

TAPE

WINDING

TIME

FREQUENCY

RESPONSE

(Using

Tape)

SIGNAL

NOISE

RATIO

HARMONIC

DISTORTION

INPUT

OUTPUT

DIN

DIMENSIONS

WEIGHT

POWER

REQUIREMENTS

POWER

CONSUMPTION

Track

Channel

Stereo

System

7”

reel

head

for

Recording

head

for

Playback

Erase

head

Servo

motor

for

capstan

drive

motor

for

reel

drive

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

cm/s

Less

than

0.04%

WRMS,

0.10%

DIN

45500

9.5

cm/s

sec.

using

360

(1200

ft.)

tape

33,000

(-20

VU)

cm/s

26,000

VU)

cm/s

25,000

(-20

VU)

9.5

cm/s

15,000

VU)

9.5

cm/s

Better

than

cm/s

DIN

45500

Less

than

0.5%

cm/s

Required

microphone

impedance:

600

ohms

Line:

(input

impedance

kohms)

Line:

0.775V

Required

load

impedance:

than

kohms

Phone:

1.3

mV/8

ohms

Input:

2.0

(input

impedance

kohms)

Output:

0.3V

Required

load

impedance:

than

kohms

440(W)

244(H)

227(D)

(17.3

9.6

8.9’)

17.0

(37.5

Ibs)

100V,

50/60

for

Japan

120V,

for

USA

and

Canada

220V,

for

Europe

except

240V,

for

and

Australia

110/120/220/240V,

50/60

switchable

for

the

other

countries

JPN

30W

U/T,

CSA,

AAL

SOW

For

improvement

purposes,

specifications

and

design

are

subject

change

without

notice.

SECTION

SERVICE

MANUAL

TABLE

CONTENTS

SPECIFICATIONS

5.3

f0:3h

site

ives

fota

EA,

teca

sei

DISMANTLING

UNIT...

2.0.0.0...

ens

CONTROLS

i532,

505

tiny

eSieeals

eters

era

BALE

Gene

ote Ges

PRINCIPAL

PARTS

LOCATION

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

0...

cee

eee

VOLTAGE

AND

CYCLE

CONVERSION.

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

0.000220

VOLTAGE

CONVERSION

...........

0.0.0

cece

eee

CYCLE

CONVERSION

sscis

ceed

wens

Ewe

VI.

OPERATING

PRINCIPLES

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

2.0.0

cece

eee

TIMING

CHART

EACH

MODE

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

2.200000

eens

EXPLANATION

EACH

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

000000

ee eee

EXPLANATION

EACH

CIRCUIT

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

0.00005,

VII.

MECHANISM

ADJUSTMENT

.........

0.00.

ccc

cece

eee

BRAKE

BAND

POSITION

ADJUSTMENT

AND

BRAKE

TENSION

ADJUSTMENT

...........

PLAY

PLUNGER

POSITION

ADJUSTMENT

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

PINCH

ROLLER

PRESSURE

ADJUSTMENT

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

TENSION

SERVO

ADJUSTMENT

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

0...

eee

eens

<295>

LOADER

PLUNGER

POSITION

ADJUSTMENT

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

TAPE

SPEED

ADJUSTMENT

....

2...

0...

cece

ees

HEAD

ADJUSTMENT

...

10...

0...

eens

AMPLIFIER

ADJUSTMENT

....

2.0.2...

ccc

eens

RESISTANCE

VARIOUS

COILS

...........

0.0.2.

eens

CLASSIFICATION

VARIOUS

P.C

BOARDS

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

P.C

BOARD

TITLES

AND

IDENTIFICATION

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

COMPOSITION

VARIOUS

P.C

BOARDS

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

HeR

For

basic

adjustments,

measuring

methods,

and

operating

principles,

refer

GENERAL

TECHNICAL

MANUAL.

SCREWS

lil.

CONTROLS

=~SOONDAHRWON>OO

DSS

OVE

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

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

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

15V

200

mA)

POWER

CORD

LINE

JACKS

LINE

OUT

JACKS

ROLLER

SENSING

PINS

DIN

JACK

(Some

models

not

have

this

facility}

DISMANTLING

UNIT

case

trouble,

etc.

necessitating

dismantling,

please

dismantle

the

order

shown

the

photographs.

Reassemble

reverse

order.

SCREWS

anos

eee

SCREWS

GEE)

BOTTOM

COVER

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

INPUT

CONTROLS

POWER

Swi

TCH—>

PHONES

OUTPUT

LEVEL

CONTROL

MONITOR

SWITCH

BIAS

ADJUSTMENT

CONTROL

REC

MASTER

CONTROL

ROLLER

OPERATION

BLOCK

ROLLER

UP/DOWN

BUTTON

CUE/REVIEW

LEVER

TAPE

SPEED

SWITCH

TAPE

SELECTOR

Fig.2

Front

View

}

REMOCON

JACK

ADAPTER

JACK

J9OI

Fig.3

Rear

View

Fig.

Controls

PANY

ease

soe

win

VI.

OPERATING:

PRINCIPLES

A3a

OM3

Y3BWIL

A348

OMS

CuO

33y

:33yN

BIW

ZuL

PTE

OLOHG

3S81Md

3d¥i

elal

Yui

O10Hd

NMOO/dN

AIX

NOILVYVIdO

:dO

“sv

9¢

ei-se\

Van

SNISNIS

omsnas\L/

ssn

(43073)

zai

bHOLV?

£0

LN3W93S

Ci)

aaa

037

€H21v7

(ma)

—

ZHILVT

Co)

238

AOI+0

“ae

asnva

”

Ais

ML'b

eevoogeeen

41437

YOLOW

13348

4H914

YOLOW

1334a

wove

NO1L93410

———>2-IMS

3u0

(1331)

yOLON

(1H91tu)

HOLON

3OV1IOA

HOI

‘ztuL

91d

430V07

A3u

Oma

3LNW

8'g

—————_|}+——>

anv

31NW

339

————___—_—-

3ud

3AteG

250

—>[_etur

pean

3ud

62aL

91d

axvad

G10H

¥Y3IONNId

JNVUB

vO6-1S

1sv4

4Oe

ZHHOOw=4

ISO

doo!

AOI+

39V110A

MOT

Fig.5

Syscon

Block

Diagram

VOLTAGE

AND

CYCLE

CONVERSION

POWER

TRANS

TSO!

VOLTAGE

SELECTOR

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

preset

the

factory

according

destination,

but

some

machines

can

set

110V,

120V

240V

required.

voltage

change

necessary,

this

can

accom-

plished

follows:

Remove

the

back

board

and

look

for

the

voltage

selector

the

center

portion

the

machine.

Change

the

position

voltage

selector

plugs

that

the

voltage

used

coincides

with

the

voltage

shown

through

the

opening

voltage

selector

plug.

CYCLE

CONVERSION

With

motor,

cycle

conversion

not

necessary.

ence,

“oO

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