Akai HX-R44 Manuel utilisateur

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AKAT

Service

manuat

|

STEREO

CASSETTE

DECK

move.

HX-R44

ABBREVIATIONS

FOR

SERVICE

MANUAL

MODEL

HX-R44

ABBREVATION

EXPLANATION

AC

Alternating

Current

ADJ

ADJustment

DC

Direct

Current

FF

Fast

Forward

FLD

FLuorescent

Display

FREQ

FREQuency

FWD

ForWarD

GND

GrouND

IPLS

Instant

Program

Locating

System

NR

Noise

Reduction

PB

Play

Back

REC

RECord

REV

REVerse

REW

REWind

SENS

SENSitivity

SW

SWitch

VR

Variable

Resistor

V.

REG

Voltage

REGulator

STEREO

CASSETTE

DECK

wove.

HX-R44

SECTION

1

SERVICE

MANUAL

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

3

SECTION

2.

PARTS

LIST

2...

cccce

ceed

ceaeieese

ees

15

SERVICE

MANUAL

HX-R44-—————

1

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.

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)

Plastic

screws

for

fixing

microswitch

(especially

in

turntable)

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>

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

obiects

(screws,

solder

droplets,

etc.)

do

not

remain

inside

the

set.

VOLTAGE

CONVERSION

Models

for

Japan,

Canada,

USA,

Europe,

UK

and

Australia

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,

220V

or

240V

as

required.

If

VOLTAGE

CHANGE

is

necessary,

this

can

be

accomplished

as

follows:

1.

Disconnect

AC

power

cord.

2.

Turn

the

VOLTAGE

SELECTOR

located

on

the

rear

panel

with

a

screwdriver

until

the

correct

voltage

is

indicated.

VOLTAGE

SELECTOR

Screwdriver

CYCLE

CONVERSION

Cycle

conversion

is

not

necessary

since

HX-R44

use

a

DC

motors.

SERVICE

MANUAL

HX-R44

II.

TIL.

IV.

VII.

VII.

IX.

SECTION

1

SERVICE

MANUAL

TABLE

OF

CONTENTS

SPECIFICATIONS

:§6

6.

¢--s5s

(se)

tens,

stan

Saye

bude

Ged

ude,

wR

ee

AE

eS

4

DISMANTLING

OF

UNIT

.....

2...

ee

ee

ce

ce

ee

enn

5

CONTROLS

305

oshieie

ole

oe

eee

cs

Ee

oS

DS

Saw

el

wee

ae

6

PRINCIPAL

PARTS

LOCATION...........

0.0...

cee

eee

eer

eens

7

MECHANICAL

ADJUSTMENT

.........

0.0...

cc

eee

cece

cee

ees

8

5-1

PINCH

ROLLER

PRESSURE

MEASUREMENT

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

8

5-2.

WINDING

TORQUE

MEASUREMENT

IN

EACH

MODE

........

8

5-3.

TAPE

SPEED

ADJUSTMENT.........

BE

ar

orate

ie

uae

Ois

nee

ictae

8

HEAD

ADJUSTMENT

......

2...

2c

cc

ccc

ce

cee

nee

tenes

9

6-1

TAPE

GUIDE

ADJUSTMENT............0

00.02

cee

eee

eee

10

6-2

REC/PB

HEAD

AZIMUTH

ADJUSTMENT

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

10

6-3

HEAD

HEIGHT

ADJUSTMENT

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

0.00200

000.

10

6-4

HEAD

BLOCK

PROJECTION

ADJUSTMENT

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

10

ELECTRICAL

ADJUSTMENT...

.....

0.0...

2c

eee

eee

eee

11

7-1

QUICK

REVERSE

SENSITIVITY

ADJUSTMENT..............

11

7-2.

PRE-AMP

P.C

BOARD

ADJUSTMENT

..................05.

12

DC

RESISTANCE

OF

HEADS

...........

0.0.0.

ccc

cee

eee

14

P.C

BOARD

TITLES

AND

IDENTIFICATION

NUMBERS

...........

14

For

basic

adjustments,

measuring

methods,

and

operating

principles,

refer

to

GENERAL

TECHNICAL

MANUAL.

SERVICE

MANUAL

HX-R44

I.

SPECIFICATIONS

TRACK

SYSTEM

4

Track

2

channel

stereo

system

TAPE

Philips

type

cassette

HEADS

Erase

head

x

1

HD

head

for

REC/PB

x

1

MOTORS

Electronically

speed

controlled

DC

motor

for

capstan

drive

x

1,

DC

motor

for

cam

drive

x

1

WOW

&

FLUTTER

+£0.07%W.

Peak

(EIAJ),

0.05%

(W.

RMS)

0.12%

(DIN)

FREQUENCY

RESPONSE

Normal:

20

to

16,000

Hz

+3

dB

(EIAJ)

CrO,

:

20

to

17,000

Hz

+

3

dB

(EIAJ)

Metal

:

20

to

18,000

Hz

+

3

dB

(EIAJ)

S/N

58

dB

55

dB

(EIAJ)

Dolby

B

ON:

Improves

up

to

5

dB

at

IkHz,

10

dB

above

SkHz

Dolby

C

ON:

Improves

up

to

15

dB

at

500

Hz,

20

dB

at

|

kHz

to

10

kHz

Distortion

INPUT

0.7%

(METAL)

0.6%

(METAL)

0.25%

(CrO>)

0.15%

(NORMAL)

(EIAJ)

Line:

410

mV/47

kohms

OUTPUT

Line:

410

m/1

kohms

POWER

REQUIREMENTS

100

V,

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

110V/120V/220V/240V,

50/60

Hz

switchable

for

other

countries

DIMENSIONS

440

(W)

x

105

(H)

x

288

(D)

mm

(17.3

x

4.1

x

11.3

inches)

WEIGHT

|_

4.5

kg

(9.9

Ibs)

*

For

improvement

purposes,

specifications

and

design

are

subject

to

change

without

notice.

*

Noise

reduction

manufactured

under

license

from

Dolby

Laboratories

Licensing

Corporation.

“Dolby”

and

the

Double-D

symbol

are

trade

marks

of

Dolby

Laboratories

Licensing

Corporation.

re

SERVICE

MANUAL

HX-R44

4

Il.

DISMANTLING

OF

UNIT

In

case

of

trouble,

etc.

necessitating

dismantling,

Please

dismantle

in

the

order

shown

in

the

photographs.

Reassemble

in

reverse

order.

W

SCREWS

CASSETTE

LID

FRONT

PANEL

UPPER

COVER

|

|

re

sonia

NY

SERVICE

MANUAL

HX-R44

lil.

CONTROLS

Fig.

3-1

©

)

TARHING

SMOCK

RAZARE

8

aT

PEA

DOLBY

MOISE

REDUCTION

MAMUFACTURED,

UNDER

LICENSE

'

Lat

LICEN!

AVIS

SUM

04

CHOC

ELECIOOWRE

Pas

OVEN

“DOLBY”

AND

THE

DOUBLE:D

SYMBOL

ARE

TRADE

MARKS

OF

VORSICHT

DURWURUUGSCEFARR

INCHT

OFFER

AKAPELEC

TRE

COLLID

DOLBY

LABORATORIES

LICENSING

CORPORATION

moos

NuMMsR

HX-AGQ

aan

wat

i

saPas

agen

ne

eae

as,

aan

on

Nias

PT

Nias

VOLTAGE

SELECTOR

AC

110/120/220/240¥

50/60Hz

20W

am

Fig.

3-2

1.

POWER

SWITCH

12.

TIMER

START

SELECTOR

2.

CASSETTE

LID

13.

REV

SELECTOR

3.

EJECT

BUTTON

14.

CONTAINS

JACKS

FOR

MIC

L/R

AND

4.

FL

DISPLAY

HEADPHONE

5.

COUNTER

RESET

BUTTON

15.

REMOTE

CONTROL

JACK

6.

INTRO

SCAN

BUTTON

16.

LINE

IN

JACKS

7.

IPLS

BUTTON

17.

LINE

OUT

JACKS

8.

DOLBY

NR

SWITCH

AND

SELECTOR

18.

VOLTAGE

SELECTOR

({u]

MODEL

ONLY)

9.

OPERATION

BUTTONS

19.

AC

POWER

CORD

10.

REC

CANCEL

BUTTON

11.

REC

LEVER

CONTROL

SERVICE

MANUAL

HX-R44

IV.

PRINCIPAL

PARTS

LOCATION

HOUSING

PCB

CMROIDI430

REEL

ROTATION

PCB

CMROIDIG4D

DOLBY

ON/OFF

SWI6

DETECTOR(A)

PCB

CMROIDI2Z90

OETECTOR(B)

PCB

CMROIDI620

EJECT

Sw902

FL

DISPLAY

DOLBY

B/C

SWI7

mi

{Bee

:

oak

-

a4

TIMER

START

SWI5

FWD/REV

Swgo!

CAM

DIRECTION

SW905

GUID

DETECTOR

PCB

CMROIDO220

REC/PB

AND

ERASE

HEAD

METER

PCB

T2060A50iB

Fig.

4-1

Front

View

VOLTAGE

SELECTOR

vs9ol

PRE

AMP

PCB

REMOTE

JACK

(U]

MoDEL

oNty

T2045A501A

J2

POWER

TRANS

T901

POWER

SUPLLY

PCB

T2060B85020

[J.U]

T20608502)

[C-A

T2060B5022

|E.B.S

POWER

SWITCH

swt

CAM

MOTOR

M90}

LEAF

SWITCH

PCB

CMRIOICI490

i,

+9,

Pose)

CAM

MOTOR

PULSE

PCB

JACK

PCB

T2045A5018

CMROICI89C

SYSCON

PCB

T2060A501A

CAPSTAN

MOTOR

M902

CAM

MOTOR

DIRECTION

PCB

—

CMROICI898

L—

CONTROL

PCB

CMROICI89A

Fig.

4-2.

Top

view

SERVICE

MANUAL

HX-R44——_——____—___—$—__—_—_——_—___

7

V.

MECHANICAL

ADJUSTMENT

5-1

PINCH

ROLLER

PRESSURE

MEASUREMENT

(Refer

to

Fig.

5-1)

REV

PINCH

ROLLER

REV

PINCH

ROLLER

SPRING

PINCH

ROLLER

SHAFT

Put

in

FWD

PLAY

Mode.

Push

pinch

roller

shaft

down

with

the

spring

gauge,

and

push

the

pinch

roller

1

to

2

mm

away

from

the

capstan

and

release

slowly.

Read

the

spring

gauge

at

the

moment

the

pinch

roller

5.2

WINDING

TORQUE

MEASUREMENT

IN

EACH

MODE

(Refer

to

Fig.

5-2)

CASSETTE

TORQUE

METER

Insert

a

cassette

torque

meter

(AJ-751179)

and

measure

in

each

mode.

For

Fast

Forward

and

Rewind,

measure

at

the

end

of

the

tape

when

the

tape

has

stopped

running.

Forward

of

Reverse

mode

Take

up

Toque:

25

to

45

g-cm

Back

Tension

Torque:

2

to

5

g-cm

Fast

Forward

or

Rewind

mode

Take

up

Torque:

70

to

150

g-cm

270

to

370

grm

|

FWD

PINCH

ROLLER

FWD

PINCH

ROLLER

SPRING

PINCH

ROLLER

SHAFT

Fig.

5-1

touches

the

capstan and

begins

to

rotate.

Specified

contact

pressure

measurement

is

270

to

370

grams.

If

the

correct

measurement

is

not

obtained,

replace

the

pinch

roller

spring.

Do

the

same

for

the

reverse

side.

5-3

TAPE

SPEED

ADJUSTMENT

(Refer

to

Fig.

5-3)

CAPSTAN

MOTOR

SY

2

TAPE

SPEED

ADJ

VR

Fig.

5-3.

Location

of

Tape

Speed

Adjustment

Variable

Resistor

Connect

a

frequency

counter

to

Line

Output

terminal.

Playback

a

1

,OOOHz

pre-recorded

Test

Tape

(AT-750744),

or

3,150

Hz

pre-recorded

Test

Tape

(AT-751263),

and

adjust

the

Tape

Speed

Adjustment

Variable

Resistor

(See

Fig.

5-3)

to

obtain

a

tape

speed

of

1,000

+

3

Hz,

or

3,150

+

10

Hz.

SERVICE

MANUAL

HX-R44