Onkyo TA-2044 Manual de usuario

TA-2044

SERIAL

NO.

3166

ONKYO

SERVICE

MANUAL

STEREO

CASSETTE

TAPE

DECK

MODEL

TA-2044

Black

and

silver

models

UOA,

UOB

SAFETY-RELATED

COMPONENT

WARNING!!

SPECIFICATIONS

COMPONENTS

IDENTIFIED

BY

MARK

“4

ON

THE

SCHEMATIC

DIAGRAM

AND

IN

THE

PARTS

Track

Format:

4

tracks,

2

channels

LIST

ARE

CRITICAL

FOR

RISK

OF

FIRE

AND

Erasing

System:

AC

erase

ELECTRIC

SHOCK.

REPLACE

THESE

COM-

Tape

Speed:

4.8

cm/sec.

(1-7/8

i.p.s.)

PONENTS

WITH

ONKYO

PARTS

WHOSE

PARTS

Wow

&

Flutter:

0.04%

(WRMS)

NUMBERS

APPEAR

AS

SHOWN

IN

THIS

MANUAL.

Frequency

Response:

20—16,000

Hz

|

(30—15,000

Hz

+

3

dB)

MAKE

LEAKAGE-CURRENT

OR

RESISTANCE

(normal

position

tape)

MEASUREMENTS

TO

DETERMINE

THAT

20—17,000

Hz

EXPOSED

PARTS

ARE

ACCEPTABLY

IN—

(30—16,000

Hz

+

3

dB)

SULATED

FROM

THE

SUPPLY

CIRCUIT

BEFORE

(high

position

tape)

RETURNING

THE

APPLIANCE

TO

THE

20—19,000

Hz

CUSTOMER.

(30—17,000

Hz

+

3dB)

(metal

position

tape)

Signal-to-Noise

Ratio:

60

dB

(metal

position

tape,

Dolby

NR

out).

A

noise

reduction

of

10

dB

above

5

kHz

and

5

dB

at

|

kHz

is

possible

with

Dolby

B

NR.

A

noise

reduction

of

20

dB

at

5

kHz

is

possible

with

Dolby

C

NR.

Input

Jacks:

Line

IN:

2

Minimum

input

level:

SOmV

Input

impedance:

50

kohms

ONKYO.

AUDIO

COMPONENTS

TA-2044

Outputs:

Line

OUT:

2

Std

output

level:

5OOmV

(0

dB)

Opt

load

impedance:

over

50

kohms

Headphone

Jack:

1

Opt

load

impedance:

8

—

200

ohms

Motors:

DC

servo

motor:

1

DC

motor:

2

Heads:

Rec/pb

head:

Special

Hard

Permalloy

Erase

head:

Ferrite

Semiconductors:

TR:

57

Diodes:

36

IC:

9

LED:

10

Power

Consumption:

27

watts

Dimensions:

435(W)

x

112(H)

x

371(D)

mm

(17-1/8”

x

4-3/8”

x

14-5/8”)

Weight:

6.0

kg.

(13.2

lbs.)

Specifications

and

external

appearance

are

subject

to

change

without

notice

because

of

product

improvements.

SERVICE

PROCEDURES

1.

Replacing

the

lamps

This

unit

used

the

lamps

listed

below.

Circuit

No.

Parts

No.

—_

Description

PL-902

210149

PLI14V

0.06A

W3.0

PL-901

210165

PL1I4V

150mA

Caution;

Before

replacing

the

lamps.

be

sure

to

unplug

the

power

supply

cable.

.

Instruction

resistance

measurement

Connect

the

insulating-resistance

tester

between

the

plug

of

power

supply

cord

and

chassis.

Specifications;

D

model

500

V

3.3+0.33

MQ

G/W

models

500

V

more

than

10

MQ

.

Replacing

the

Hall

ICs

Cautions:

As

the

position

of

leg

of

DN6838

and

DN838

differ,

use

the

same

Hall

IC

when

replacing.

DN6838

(222558)

DN838

(222470)

Printed

side

Holder

§N271901

73

Cut

Jumper

lead

NATD-1756

2

FEATURES

Microcomputer

Controlled

Multi-Program

System

A

highly

efficient

microcomputer

is

used

to

provide

a

wide

range

of

programmable

functions.

The

song

location

function

rapidly

winds

tape

directly

to

the

beginning

of

any

particular

song

on

a

cassette

up

to

nine

songs

away

from

the

present

location

in

either

direction.

A

repeat

function

repeatedly

plays

a

particular

song

or

the

section

of

a

cassette

between

the

[O00]

tape

counter

point

and

either

the

beginning

or

end

of

the

cassette

up

to

ten

times.

There’s

also

an

automatic

music

search

function

that

plays

about

the

first

eight

seconds

of

each

song

in

the

forward

or

reverse

direction.

Auto

Space

Rec

Mute

Button

Press

this

button

while

you’re

making

a

recording

to

auto-

matically

enter

a

blank

section

of

tape

about

five

seconds

long.

Once

the

blank

section

has

been

entered,

the

TA-2044

will

automatically

switch

to

the

REC-PAUSE

mode.

To

continue

recording,

simply

press

the

PLAY

button.

This

function

is

convenient

for

temporarily

interrupting

record-

ing,

editting

tape

during

dubbing

and

inserting

unrecorded

sections

long

enough

for

the

automatic

continuous

song

location

function

to

detect.

Special

Hard

Permalloy

Head

Designed

for

Metal

Tapes

The

special

process

used

to

obtain

the

extra

hard

permalloy

head

surface

ensures

greater

resistance

to

wear

and

a

better

saturation

flux

density

in

order

to

take

full

advantage

of

high

performance

metal

tapes.

The

hyperbolic

shape

also

improves

head-to-tape

contact.

2-Motor

Tape

Transport

with

Separate

Head

Assembly

Motor

The

tape

transport

system,

along

with

the

heads,

determines

the

level

of

performance

of

a

cassette

deck.

To

guarantee

extremely

stable

and

accurate

transport

the

TA-2044

uses

a

DC

servo

controlled

capstan

motor.

This

motor

is

frequency

or

instantaneous

changes

in

load.

A

highly

reliable,

simple

drive

transmission

system

and

precision

vertical

cassette

holder

further

enhance

overall

accuracy

and

stability.

As

a

result,

wow

and

flutter

is

under

0.04%.

In

addition,

separate

DC

motors

drive

the

reel

tables

and

head

base

and

the

head

assembly

is

constructed

to

move

silently

with

no

annoying

clicks.

Dolby

B

and

C

Noise

Reduction

Along

with

standard

Dolby

B

NR,

the

TA-2044

also

has

the

even

more

effective

Dolby

C

NR

system.

Dolby

C

NR

reduces

tape

background

noise

by

20

dB

at

5

kHz,

about

3

times

more

than

Dolby

B

NR.

In

addition

to

its

wide

band

noise

reduction,

Dolby

C

NR

uses

a

sliding

band

technique

that

varies

the

band

width

of

noise

reduction

according

to

the

input

level,

thereby

avoiding

noise

“pump-

ing”.

Dolby

C

NR

also

has

an

anti-saturation

effect

to

reduce

the

chance

of

tape

saturation

in

the

high

range.

All

these

features

combine

to

eliminate

the

adverse

effects

on

tape

sound

that

other

noise

reduction

systems

can

cause.

TA

2044

7

TAPE

MECHANISM-EXPLODED

VIEW

80:

(

80-a~80-h

)

172

:

(172-a~172-d

)

115:

(115-a~115-g

)

94:

(94-a~94-f

)

91°:

(21-a~21-f

)

PACKING

VIEW

D

model

REF. NO.

WO

conn

kf WH WN

PARTS

NO.

DESCRIPTION

29095012-1

500x800mn,

Protection

sheet

290311A

620x550mm,

Poly

bag

29090769

Pad,

right

29090770

Pad,

left

29050790

Master

carton

box

282301

Sealing

hook

260012

W-500mm,

Damplon

type

Accessary

bag

ass’y

29340714

Instruction

manual

253074

Connection

cable

29365006-1

Warranty

card

29358002

Service

station

list

29100005

220x330mm,

Poly

bag

'

TA-2044

G/W

model

REF.

NO.

PARTS

NO.

DESCRIPTION

1

29095012-1

500x800mm,

Protection

sheet

2

290311A

620x550mm,

Poly

bag

3

29090769

Pad,

right

4

29090770

Pad,

left

6

29050790

Master

carton

box

7

282301

Sealing

hook

8

260012

W-500mm,

Damplon

tape

9

Accessary

bag

ass’y

29340715

Instruction

manual

253074

Connection

cable

29365005-3

Warranty

card

(V)

25055040

CV-K-2,

Conversion

plug

(W)

29100005

220x330mm,

Poly

bag

(V):

Only

West

Germany

model

(W):

Only

120/220V

model

TA-2044

ADJUSTMENT

PROCEDURES

PRECAUTIONS

Oscilloscope

1.

Before

adjustment,

clean

the

following

parts

with

an

Attenuator

alchol

moinstend

swab.

AC

voltmeter

*

record/playback

head

*

erase

head

Non-magnetic

screw.

driver

*

pinch

roller

*

capstan

Blank

tapes

(completely

erased)

NORMAL

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

NEW

UD90

2.

Do

not

use

magnetized

screwdriver

for

adjustments.

HIGH

................00..

NEW

XL-1190

METAL

............20000%

NEW

MX60

3.

Demagnetize

record/playback

head

with

a

head

de-

Test

tapes

magnetizer.

VTT-658

:

10KHz,—15dB

MTT-111

:

3kHz,—10dB

TEST

EQUIPMENT/TOOLS

REQUIRED:

MTT-150

:

Dolby

level

calibration

Audio

oscillator

400Hz,

tone

200nWb/m

Digital

frequency

counter

TW-2111

:

Torque

meter

Connection

of

Output

indicator

Adjustment

instrument

point

_

—

TW-2111

R709

35

to

SS5gem

Playback

torque

Frequency

3,000

to

3,010Hz

counter

to

Semi-fixed

LINE

output

terminal

on

the

moter

AC

voltmeter

and

oscillo-

See

fig.

1

Set

the

semi-fixed

scope

to

resistors

R123

and

LINE

output

R124

to

center

terminal

position.

Maximum

VTT658

A

Head

azimuth

|

274

same

voltmeter

screws

phase

at

channels

Land

R.

AC

MTT-150

voltmeter

C

1kHz,

—20dB

Bias

nd

NEW

XL-I

|

REC/

AC

a

Itmet

current

12kHz,

—204B

90

PB

voltmeter

AC

Attenuator

or

Record

voltmeter

AF

OSC

output

7

IkHz

level

AC

R401,

R402

FF,

REW

torque

......

70

~

130gcm

AC

voltmeter

to

terminals

TP-401

and

TP-402

Playback

level

R123

(Ch.

L)

R124

(Ch.

R)

Frequency

MTT-111

counter

OdB

indicator

Same

level

INPUT

VOLUME

at

REC/PB

|_

ae

ceseeee

maximum

R423

(Ch.

L)

R424

(Ch.

R)

INPUT

VOLUME

seecceccces

maximum

Same

level

at

REC/PB

voltmeter

TA-2044

NCAF-1754

PB

LEVEL

PLAY

TORQE

ADJ

at

TP4Ot

PBLEVEL

C)

METER

ADJ

[

R401

(o)

REC

LEVEL

O

1P402

R

R402

R423

R424

(6)

[oJ

eras

a.

L

R

OSCILLOSCOPE

AF

OSC

Attenuator

LINE

IN

Test

point

VTVM

fig-2

O°

(IN

PHASE)

45°

HBOOR

fig.

1

Confirming

phase

relationship

TA-2044

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Manuales populares de pletina de casete de otras marcas