Onkyo TA-R77 Manuale utente

TA-R77

SERIAL

NO.

3144

ONKYO.

SERVICE

MANUAL

STEREO

CASSETTE

TAPE

DECK

MODEL

TA-R77

OV

AC,

ЭН;

SAFETY-RELATED

COMPONENT

WARNING!!

SPEC]

FICATIONS

COMPONENTS

IDENTIFIED

BY

MARK

4.

ON

THE

Track

system:

4track,

2-channel

stereo

SCHEMATIC

DIAGRAM

AND

IN

THE

PARTS

LIST

ARE

Recording

System:

AC

bias

CRITICAL

FOR

RISK

OF

FIRE

AND

ELECTRIC

SHOCK.

Erasing

System:

AC

erase

REPLACE

THESE

COMPONENTS

WITH

ONKYO

PARTS

Tape

Speed:

4.8

cm/sec

WHOSE

PARTS

NUMBERS

APPEAR

AS

SHOWN

IN

THIS

Wow

and

Flutter:

0.04%(WRMS)

MANUAL.

Frequency

Response:

20—

16,000

Hz

(Normal)

(30—15,000

Hz

+3

dB)

MAKE

LEAKAGE-CURRENT

ОК

RESISTANCE

20—

18,000

Hz

(High)

MESUREMENTS

TO

DETERMINE

THAT

EXPOSED

PARTS

(30—

17,000

Hz

+3

dB)

ARE

ACCEPTABLY

INSULATED

FROM

THE

SUPPLY

CIR-

20—

20,000

Hz

(Metal)

CUIT

BEFORE

RETURNING

THE

APPLIANCE

TO

THE

(30—18,000

Hz

+3

dB)

CUSTOMER.

S/N

Ratio:

Dolby

NR

out:

60dB

(metal

position

tape)

A

noise

reduction

of

10

dB

above

5

kHz

and

5

dB

at

1

kHz

is

possible

with

Dolby

B.

A

noise

reduction

of

20

dB

at

5

kHz

is

possible

with

Dolby

C.

Input

Jacks:

Line

IN:

2

Minimum

input

level:

50

mV

Input

impedance:

50

kohms

DIN

Jack:

1

Minimum

input

level:

0.1

mV/1

kohm

Input

impedance:

2.7

kohms

ONKYO.

AUDIO

COMPONENTS

ТА-К77

Line

OUT:

2

Std

output

level:

500

mV

(0

dB)

Opt

load

impedance:

over

50

kohms

DIN

Jack:

1

Standard

output

level:

500

mV

(at

0

dB)

Opot

load

impedance:

Output

Jacks:

over

50

kohms

Motors:

DC

motor:

3

Heads:

Sendust

rec/pb

head:

1

Ferrite

erase

head:

1

Semiconductors:

TR:

65

Diodes:

35

IC:

10

LED:

18

АС

220

У/50

Hz,

120/220

V,

50/60

Hz,

and

240

V/50

Hz

30

watts

Power

supply:

Power

Consumption:

Dimensions:

435(W)

x

112(H)

x

371(D)

mm

(17-1/8"

x

4-3/8"

x

14-5/8)"

Weight:

6.7

kg.

(14.8

lbs.)

Specifications

and

external

appearance

are

subject

to

change

without

notice

because

of

product

improvements.

FEATURES

Quick

Reverse

Operation

With

Photo

Sensor

A

newly

developed

photo

sensor

is

used

to

detect

the

point

where

the

direction

of

tape

transport

is

reversed.

This

system

makes

it

possible

to

perform

transport

reversal

in

about

0.9

seconds.

Since

tape

transport

is

virtually

uninterrupted,

quick

reverse

is

ideal

for

continuous

side

A-side

B

playback

and

recording

as

well

as

endless

playback

for

background

music.

Microcomputer-Controlled

3-Motor

System

The

tape

transport

system,

along

with

the

heads,

determines

the

performance

level

of

a

cassette

deck.

To

guarantee

extermely

stable

and

accurate

transport,

the

TA-R77

uses

a

DC

servo-controlled

capstan

motor.

This

motor

is

unaffected

by

fluctuations

in

the

power

supply

voltage

and

frequency

or

instantaneous

changes

in

load.

A

highly

reliable,

simple

drive

transmission

system

and

a

precision

vertical

cassette

holder

further

enhance

overall

accuracy

and

stability.

As

a

result,

wow

and

flutter

is

0.04%.

In

addition,

separate

DC

motors

drive

the

reel

tables

and

head

base.

For

ex-

traconvenience,

the

head

assembly

is

constructed

to

move

silently

with

no

annoying

clicks.

Auto

Space

Rec

Mute

Button

Press

this

button

while

you're

making

a

recording

to

automatically

enter

a

blank

section

of

tape

about

five

seconds

long.

Once

the

blank

section

has

been

entered,

the

TA-R77

will

automatically

switch

to

the

REC-PAUSE

mode.

To

continue

recording,

simply

press

the

PLAY

button.

This

function

is

useful

for

temporarily

in-

terrupting

recording,

editting

tape

during

dubbing

and

inserting

unrecorded

sections

long

enough

for

the

AMCS

circuit

to

detect.

Dolby

B

and

C

Noise

Reduction

Along

with

standard

Dolby

B

NR,

the

TA-R77

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

С

NR

uses

a

sliding

band

technique

that

varies

the

band

width

of

noise

reduction

according

to

the

input

level,

thereby

avoiding

noise

“pumping.”

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.

Auto

Music

Control

System

(AMCS)

TA-R77

has

an

AMCS

function

which

automatically

locates

the

beginning

of

every

song

on

a

cassette

in

either

the

forward

or

reverse

direction.

When

the

AMCS

button

is

pressed

during

the

forward

play

mode,

tape

is

rapidly

wound

to

the

beginning

of

the

and

the

first

10

seconds

(approximately)

is

played.

Then

the

tape

is

rapidly

wound

forward

to

the

beginning

of

the

and

about

10

seconds

is

played.

This

process

continues

until

the

FORWARD

PLAY

button

is

pressed

to

cancel

AMCS

and

return

to

normal

palyback.

When

the

AMCS

button

is

pressed

during

the

reverse

play

mode,

this

process

is

performed

in

the

reverse

direction.

·

Bright

Peak

Level

Meters

The

left

and

right

peak

level

meters

react

instantaneously

to

signals

and

the

two-color

layout

assures

that

you

won't

miss

any

potential-

ly

harmful

input

signals

when

setting

the

recording

level.

Erasure

Prevention

Tab

Monitor

The

absence

or

presence

of

the

erasure

prevention

tabs

for

cassette

sides

A

and

B

is

automatically

detected

and

displayed.

This

assures

that

there

will

be

no

mistakes

when

you're

about

to

make

an

im

portant

recording.

SERVICE

PROCEDURES

1.

Replacing

the

lamps

This

unit

uses

the

lamps

listed

below.

Circuit

No.

Parts

No.

Description

PL901

210165

14

V,

150

mA,

Dial

plate

illumination

PL902

210149

PL14VO.

06AW-3.0,

Power

indicator

210169

PL14V0.

06AW-3.0,

Power

indicator

(Black

type)

Caution;

Before

replacing

the

lamps,

be

sure

to

unplug

the

power

supply

cable.

2.

Insulation

resistance

mesurement

Connect

the

insulating-resistance

tester

between

the

plug

of

power

supply

cord

and

chassis.

Specifications;

D

model

G/W

models

500

V

3.3

+0.33

MQ

500

V

more

than

10

MQ

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MECHANISM

OPERATIONS

The

rotations

of

the

assist

motor

are

transmitted

via

the

worm

gear

simultaneously

to

the

cam

that

raises

and

lowers

the

head

base,

the

brake

cam

and

the

head

reversal

cam.

Figures

1,

2

and

3

show

the

configuration

of

each

cam.

The

sections

in

the

diagrams

in

which

the

name

of

an

operation

is

written

within

the

angular

range

of

that

operation

indicate

the

effective

operating

range

of

the

cam

for

that

particular

operation.

The

—

mark

indicates

that

operation

is

pro-

hibited

since

the

positions

of

the

head

base

and

brake

panel

are

not

fixed.

The

rotary

encoder

shown

is

Fig.

4

detects

each

angular

operation

range

and

the

4-bit

data,

a,

b,

c

and

d,

are

obtained

from

this

encoder.

The

microcomputer

uses

these

data

to

check

the

posi-

tion

of

the

mechanism

and

drive

the

assist

motor

to

the

correct

position.

The

relationship

between

rotary

encoder

output

and

the

mechanism

position

is

shown

in

Fig.

5.

Fig.

3

Head

reversal

cam

STOP

Є.

PLAY

STOP

55744"

Е

PLAY

Fig.

1

Head

base

up-down

cam

Fig.

4

Rotary

encoder

STOP

(HEAD-REVERSAL

CAM)

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SPECIAL

MODES

OF

OPERATION

MODE

SELECTOR

GUIDE

e

Confirm

the

current

tape

travel

direction

setting

with

the

direction

indicator

before

beginning

playback

or

recording.

e

The

following

explanations

assume

that

the

cassette

side

A

is

facing

outward.

е

Due

to

the

location

of

the

photo

sensor,

the

transparent

leader

must

go

by

the

heads

before

it

is

sensed

for

reverse-to-forward

switching.

As

a

result,

the

silent

gap

is

about

1

second

longer

than

the

forward-to-reverse

switching

gap.

Mode

Selector

|

Mode

Selector

Button

|

Таре

Travel

=

|

Таре

Travel

=

Playback

Only

forward

Press

@

REC

button

and

forward

play

button

at

the

same

time.

Only

side

A

(front)

is

recorded.

Press

B>

forward

play

button

Only

side

A

(front)

is

played

(once).

One

side

Press

6

REC

button

and

=

reverse

play

button

at

the

same

time.

Only

side

B

(rear)

is

recorded.

Press

-t

reverse

play

button

.

Only

side

B

(rear)

is

played

(once).

Press

REC

button

and

m=

forward

play

button

at

the

same

time.

Side

A

and

then

B

are

recorded

after

which

tape

travel

automatically

stops.

Press

g-

forward

play

button

to

begin

play-

back

in

the

forward

direction.

Side

А

and

then

B

are

played

after

which

tape

travel

automatically

stops.

Two

sides

If

playback

is

started

in

If

recording

is

started

in

(only

the

reverse

direction,

the

reverse

direction,

forward

only

side

B

is

played

only

side

B

is

recorded

to

after

which

tape

travel

after

which

tape

travel

reverse)

automatically

stops.

automatically

stops.

Press

#

forward

play

button

and

6

REC

button

at

the

same

time.

Side

А

and

then

side

B

are

recorded

after

which

tape

travel

automatically

stops.

If

recording

is

started

in

the

reverse

direction,

only

side

B

is

recorded.

Press

=

forward

play

button

.

Sides

A

and

B

are

played

five

times

or

until

B

STOP

button

is

pressed.

CHASSIS-EXPLODED

VIEW

REF.

NO.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

A^

21

А

22

23

А

PARTS

NO.

16088121

16069121

28400131B

28400132A

16088901

28191170A

28199086A

27190194

27300532

210165

28321035

28321028

28321033

28321034

28321031

28321032

28140185

28321027

28321028

28320828B

28321023

28321024

2780179

28321073A

28321074A

225129

25045124

25045

132

3500065A

25035224

25035192

25035207

210169

210149

230689

230690

230691

DESCRIPTION

Front

panel

ass’y

Front

panel

ass’y

(B)

Window

(B)

Cassette

lid

ass’y

Clear

plate

Film

Holder,

LED

Holder

for

6

14

V,

150

mA,

Lamp,dial

plate,

Illumination

Knob,

timer

Knob,

timer

(B)

Knob,

input

level

L

Knob,

input

level

L

(B)

Knob,

input

level

R

Knob,

input

level

R

(B)

Cushion

Knob,

eject

Knob,

eject

(B)

Knob,

base

Knob,

power

Knob,

power

(B)

Spring

Knob,

band

Knob,

band

(B)

Level

meter

Stereo

headphone

jack

Stereo

headphone

jack

(B)

DE7150FZ

10-

3РАС4ООУ,

Capacitor

15

NPS-121-L188P,

Power

switch

(D)

NPS-122-L156P,

Power

switch

(G)

NPS-121-L171P,

Power

switch

(W)

14У60тА,

Lamp,

power

indicator

I4V,

60mA,

Lamp,

power

in-

dicator

(B)

NPT-807D,

Power

transformer

(D)

NPT-807G,

Power

transformer

(G)

NPT-807DG,

Power

transformer

(W)

25

AN

UI

U2

PARTS

NO.

253099B

253083

270025

270280

28184180

28184181

27115139

27120472

27120473

27120474

27170150

27110193A

244046

27300534

24610634A

2713033B

834420068

838440089

870100

27300397-1A

870065

834426068

838130088

801230

27273022

27190009

831430088

28140408

834430108

25065123

16088534

16094534A

16088535

DESCRIPTION

AS-UC-3,

Power

supply

cord

(D)

AS-CEE,

Power

supply

cord

(G/W)

SR-3P-4,

Strainrelief

(D)

SR-4K-4,

Strainrelief

(G/W)

Top

cover

Top

cover

(B)

Side

bracket

Back

panel

(D)

Back

panel

(G)

Back

panel

(W)

Bottom

board

Front

bracket

Tape

mechanism

ass'y

Cassette

panel

Tube,

light

Bracket,

power

transformer

3TTS

+

6B(BC),

Tapping

screw

4TTB

+

8C(BC),

Tapping

screw

Washer

Special

screw

Special

washer

2.6TTS

+

6B(BC),

Tapping

screw

3TTB+

8B,

Tap-

ping

screw

3TTS

+

8B(BC),

Tapping

screw

Joint

C

Holder

3TTW

+

8B(BC),

Tapping

screw

Cushion

3TTS+

10B(BC),

Tapping

screw

NSS-1258P,

Voltage

selector

switch

NAAF-1634,

Rec.

and

playback

amplifter

pc

board

ass’y

(D)

NAAF-1634a,

Rec.,

playback

and

DIN

amplifier

pc

board

ass'y

(G/W)

NAPS-163$,

Power

supply

cir-

cuit

pc

board

ass'y

REF.

NO.

PARTS

NO.

U3

16088536

U4

16088537

05

16088538

U6

16088539

(7

16088540

(8

16088541

U9

16088542

U10

16088543

011

16088544

U12

16088545

U13

16088546

014

16088547

U15

16088548

Note:

(D);

120

V

model

(G):

220

Y

model

(W):

120/220

Y

model

(B):

Black

model

TA-R77

DESCRIPTION

NASW-1636,

Dolby

switch

pe

board

а$5'у

NALED-1637,

Dolby

indicator

LED

m

board

ass'y

NALED-1638,

Tape

selector

in-

dicator

LED

pc

board

ass’y

NACOC-1639,

Controller

pc

board

ass’y

NAIND-1640,

In-

dicator

LED

pc

board

ass’y

NALED-1641,

Tape

counter

in-

dicator

LED

pc

board

ass’y

NASW-1642,

Mode

switch

pc

board

ass'y

NASW-1643,

Timer

switch

pc

board

ass’y

NALED-1644,

TAB

indicator

LED

pc

board

ass'y

NALED-1645,

Direction

in-

dicator

LED

pc

board

ass’y

NALED-1646,

Direction

in-

dicator

LED

рс

board

ass’y

NAPL-1647,

Lamp

pe

board

ass’y

NASW-1648,

Operation

switch

рс

board

ass’y

NOTE:

The

components

identified

by

mark

A

are

critical

for

risk

of

fire

and

electric

shock.

Replace

only

with

parts

number

specified.

ТА-К77

ADJUSTMENT

PROCEDURES

PRECAUTIONS

1.

Before

adjustment,

clean

the

following

parts

with

an

alcohol

moinstend

swab.

1.

Tape

speed

adjustment

Connect

the

frequency

counter

to

the

line

outpout

terminal.

Play

the

MTT-111

back.

*

ord/playback

head

*

h

. .

*

pinch

/раубас

А

амал

Adjust

the

semi-fixed

resistor

on

the

motor

control

pc

board

so

that

the

counter

indication

becomes

3,000Hz.

*

rybber

belt

2.

Do

not

use

magnetized

screwdriver

for

adjustments.

Demagnetize

record/playback

head

with

a

head

demagnetizer.

4.

The

switches

and

controls

should

be

set

as

follows

unless

otherwise

specified.

ээ

2.

Play

torque

adjustment

Play

the

torque

meter

TW-2111

back.

TAPE

SEL

NORM

Adjust

the

R703

so

that

the

torque

of

take-up

reel

becomes

DOLBY

NR....................

OUT

40

gr-cm.

INPUT

LEVEL................

0

TI

MEMORY

...........

OFF

МЕМ

R

3.

Head

azimuth

adjustment

TEST

EQUIPMENT/TOOLS

REQUIRED:

Play

the

test

tape

VTT-658

back.

Audio

oscillator

Adjust

the

head

azimuth

screws

so

that

the

AC

volt-

Digital

frequency

counter

e

f

reads

maximum.

Oscilloscope

Ig.

Attenuator

AC

voltmeter

Non-magnetic

screw

driver

Blank

tapes

(completely

erased)

4.

Playback

frequency

adjustment

Connect

the

AC

voltmeter

to

the

line

output

terminal.

Play

NORMAL

UD-XL/I

the

MTT-215C

back.

Adjust

the

R125

and

R126

so

that

the

ШОН...

UD-XL/II

315

Hz

and

10

kHz

signal

level

become

same.

METAL.........................

MX

Test

ta

5

VIT

-658

.

10

kHz.

—15

dB

5.

Playback

output

level

adjustment

МТТ-111

|

3

kHz

—10

dB

Connect

the

AC

voltmeter

to

the

TP151

and

TP152

MTT-150

:

Dolby

level

calibration

terminals.

Play

the

MTT-150

back.

400

Hz

tone

200

nWb/m

Adjust

the

R127

and

R128

so

that

the

indication

of

AC

МТТ-215С

.

315

Hz.

10

ЕН?

voltmeter

becomes

580

mV.

TW-2111

:

Torque

meter

MC-12C

:

Mirror

ta

or

аре

6.

Level

meter

adjustment

Play

the

MTT-150

back.

Adjust

the

R618

so

that

the

O

dB

of

level

meter

light

on.

E.HEAD

|

RIP

HEAD

Head

azimuth

.

А

Head

azimuth

7.

Recording

bias

adjustment

adjust

screw

“11

У

88091

screw

Insert

the

normal

blank

tape

into

the

cassette

holder.

Press

эг

D

[е]

mh

the

recording

and

pause

buttons

together

and

put

the

casstte

Mounting

screw

Бин

=

____-----

Head

base

deck

into

the

recording

mode.

Apply

the

400

Hz

signal

to

—

Mounting

screw

line-in

terminal.

Adjust

the

input

level

volume

so

that

the

fe

|

Jm

is

|

0

dB

indicator

light

up.

Then

set

the

attenuator

for—10

dB

1

input

level.

Release

the

pause

button

and

record

on

the

tape.

S

—

SN

the

frequency

of

the

10

kHz

and

record

again.

SO

Adjust

the

R823

(REV

L

ch.),

R824

(REV

R

ch.),

R825

(fig.

1)

2

7

$

(FWD

L

ch.)

and

R826

(FWD

R

ch.)

so

that

the

400

Hz

and

9.

6

k

BLUE

10

kHz

playback

level

become

same.

|

И

(

|

BLACK

GREEN

|

2

|

%

2

41-7

BLACK

RED

8.

Recording

level

adjustment

Insert

the

normal

blank

tape

into

the

cassette

holder.

Apply

the

1,000

Hz

signal

to

line-in

terminal.

Put

the

cassette

deck

into

the

recording

mode.

Adjust

the

input

level

volume

so

that

the

voltmeter

reads

350

mV.

Record

on

the

tape.

Adjust

the

R251

(L

ch.)

and

R252

(R

ch.)

so

that

the

playback

level

becomes

350

mV

+0.5

dB.

9.

Clock

adjustment

Connect

the

frequency

counter

via

the

resistor

100

КО

to

the

TP

terminal

on

the

control

pc

board.

Adjust

the

R782

so

that

the

frequency

counter

indication

becomes

170

+

10

kHz.

Test

point

TP

100K

Frequency

of

COC1639

Counter

TA-R77

R782

CLOCK

Hg

PLAY

TORQUE

NACOC-1639

rom

METER

ADJ

BIAS

ADJ

LO

REC

LEVEL

R286

R284

R285

R283

R251

R

P)

PANE

—

TN

1

FR

RR

FL

RL

(o

|

К252

TP

ТР

Г]

F.RIFWD.RCH)

ТР302

R.R(REV.RCH)

Q152

0151

RCH

LCH

NAAF-

1634

TP152

TP151

L]

D

PB

LEVEL

PB

LEVEL

о)

К128

(о)

К127

о

Со

|

R126

F

ADJ

о

О

D

МОЛ1ІЗА

sau

k

ALIHM

Ww

ke

AV

M9

ач

NO

мал

NOLLO3NNOO

—

10

—

Onkyo TA-R77 Manuale utente

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