Onkyo TA-2550 Manuel utilisateur

TA-2550

SERIAL

NO.

3300

ONKYO

SERVICE

MANUAL

STEREO

CASSETTE

TAPE

DECK

Black

and

silver

model

SAFETY-RELATED

COMPONENT

WARNING!!

COMPONENTS

IDENTIFIED

MARK

“4

THE

SCHEMATIC

DIAGRAM

AND

THE

PARTS

LIST

ARE

CRITICAL

FOR

RISK

FIRE

AND

ELECTRIC

SHOCK.

REPLACE

THESE

COM-

PONENTS

WITH

ONKYO

PARTS

WHOSE

PARTS

NUMBERS

APPEAR

SHOWN

THIS

MANUAL.

MAKE

LEAKAGE-CURRENT

RESISTANCE

MEASUREMENTS

DETERMINE

THAT

EXPOSED

PARTS

ARE

ACCEPTABLY

IN-—

SULATED

FROM

THE

SUPPLY

CIRCUIT

BEFORE

RETURNING

THE

APPLIANCE

THE

CUSTOMER.

ONKYO.

AUDIO

COMPONENTS

SPECIFICATIONS

Track

Format:

4-tracks,

2-channels

Erasing

System:

erase

Tape

Speed:

4.8

cm/sec.

(1-7/8

i.p.s.)

Wow

and

Flutter:

0.045%

(WRMS)

Frequency

Response:

20—17,000Hz

(Normal)

(30—16,000Hz

3dB)

20—18,000Hz

(High)

(30—17,000Hz

3dB)

20—19,000Hz

(Metal)

(830—18,000Hz

3dB)

S/N

Ratio:

60dB

(metal

tape,

Dolby

off)

Anoise

reduction

10dB

above

5kHz

and

5dB

1kHz

possible

with

Dolby

NR.

noise

reduction

20dB

5kHz

possible

with

Dolby

NR.

Input

Jacks:

Line

IN:

Input

sensitivity:

6(OmV

Input

impedance:

50kohms

Outputs:

Line

OUT:

Standard

output

level:

500mV

(OdB)

Optimum

load

impedance:

over

kohms

Headphone

jack:

Optimum

load

impedance:

200

ohms

Motors:

servo

motor:

Heads:

REC/PB:

Special

Hard

Permalloy

Erase

head:

Ferrite

Power

Supply

Rating:

220V,

50Hz

Power

Consumption:

watts

Dimensions:

435(W)

132(H)

366(D)mm

(17-1/8"

5-3/16"

14-3/8")

Weight:

§.8

kg.

(12.8

Ibs.)

Specifications

and

external

appearance

are

subject

change

without

notice

because

product

improvements.

TA-2550

REC/PB

level

—>

SERVICE

PROCEDURES

Replacement

power

supply

cord

There

are

two

power

supply

cord

outlets

the

strainrelief.

Insert

them

prescribed

direction

ensure

safety.

AS-UC-

(UD<120V>

model)

should

inserted

lengthwise

and

other

types

cords

should

inserted

horizontally.

Power

Supply

Cord

Power

Supply

Cord

Horizontal

length

wise

direction

Insulating

resistance

measurement

Connect

the

insulating-resistance

tester

between

the

plug

power

supply

cord

and

chassis.

Specifications;

SOOV

than

1OMQ

PRO

CIRCUIT

OPERATION

EXPLANATION

Regarding

recording

frequency

characteristic

and

bias

Ordinarily,

the

recording

bias

current

increased,

REC/PB

frequency

response

level

the

high

frequency

region

(about

10KHz

and

above)

drops,

and

the

bias

decreased,

the

response

rises.

Bias

decrease

Frequency

ene

<—_———_

Bias

increase

REC/PB

level

Regarding

the

basic

operation

PRO

(Refer

Fig.

The

PRO

uses

the

PC1297CA

IC.

The

operation

accordance

with

the

following.

(a),

the

recording

bias

added

onto

the

audio

signal,

and

the

recording

signal

detected.

This

the

same

the

recording

head

recording

the

signal

the

tape.

The

signal

preserves

the

frequency

response

with

the

integrated

circuit

(b).

R450

R448

(2.1)

C426

R450

R448

*”

means

the

frequency

Fig.

the

frequency

which

effective

from

the

beginning

determined.

the

ordinary

situation,

this

half

the

audio

band

(10KHz),

(1OKHz

7.5KHz).

(c),

order

use

the

affected

waveform

after-ward,

absolute

detection

carried

out.

Frequency

Rise

Frequency

—>

(d),

the

waveform

peak

value

detected.

The

output

becomes

the

peak

voltage.

(e),

the

standard

voltage

and

the

voltage

(4)

are

compared.

With

the

output

(e),

the

frequency

generation

level

controlled

(voltage

controlled

amplifier).

That

is,

the

bias

size

varied.

Summing

6):

(a),

the

time

constant

(frequency)

that

detected

the

recording

signal

preserved,

and

above

certain

frequency

and

above

certain

level,

the

VCA

controls

the

bias

current

causeing

its

reduction.

When

this

done,

the

maner

shown

the

explanation

Item

above,

the

frequency

high

region

raised.

With

this

control,

the

audio

signal

instantaneously

dealt

with.

Regarding

the

operating

conditions

the

PRO

With

equation

(2.

noted

above,

the

effect

begins

the

frequency

thus

determined.

Above

certain

level

the

effect

begins.

(Substantially

dB:

the

vicinity

500mV

line

out)

The

audio

signal

component

level

dependent

upon

the

waveform

after

point

(c).

PRO

BLOCK

DIAGRAM

Vee

VOLTAGE

pPC1297CA

REGULATION

AND

THERMAL

IAS

PROTECTION

gg7

OSCILLA

10P

VCA

{

PEAK

ABSOLUTE

PEAK

DETECTOR

(ea

Seer,

eter

Sala

1C436

R448

0.047

C430

100K

R447

0.1

100K

ae:

BIAS

CURRENT

R468

10K

osc

10K

BIAS

INTEGRATING

ADJUST

AOJUST

BIA

CIRCUIT

C424

T0426

CUR

9.01

0.01

LEFT

RIGHT

CHANNEL

RECORD

HEAD

AUDIO

exe

HEAD

SIGNAL

cut

ofr

R450+R448

xC426

xR450

R448

Fig.

rif

72)

SRAM

NRA

Reon

BLOCK

DIAGRAM

AMP

BIAS

P.B

Q160

TRAP

LEVEL

L101

R107

HEAD

DOLBY

DINLAMP

SELECTOR

$301.$302

DIN

OUT

RISS

R157

DINE

MUT

a223

869

LINE

aisi

MPX

BUFFER

FILTER

L201

utne

OUT

LINE

MUT

Q221

TAPE

SELECTOR

BIAS

OSC

Q427.0428

2401

«a

DOL

BY.

DECODER

Q101

TAPE

Q211

Q213

SOURCE

DOLBY

ENCODER

Q203

ACCU

R466

Q303

MICRO

COMPUTER

METER.

AMP

TP.1

R501

Qso1

Q722

BUFFER

a2i7_

|%235

EAD.PHONE|

AMP

Q301

—]

—

OUT

rec

amp

BLAS

R413

0403

L407

_-otp3

PRO

—we-

2467

Q415

Bae

ee}

OSS¢e-VL

REMOTE

CONTROL

OPERATION

MICRO

COMPUTER

Q701

MICRO

COMPUTER

@s501

REAL

TIME

COUNTER

Q722

—_+-

0901~

0904

—+<4—

0905,0906

MICRO

COMPUTER

(HD614042SH57)

HD614042SH57

PLAY

LED

t¢

REPEAT

FULL

BLOCK

F.L,

DISPLAY)

TAPE

[6]

SOURCE

rene

TuneD

WeL8]

H :

ACCU

BUSY

BIAS

CONT

DIN

MUTE

REC

MUTE

LINE

MUTE

TEST

SOURCE

TAPE

ACCU

BALANCE

CHECK

POWER

OFF

SIG

CASS

REC.

INH.

ROTATION

SENSOR

22|

(TAKE

SIDE)

MECHA

POSITION

SWITCH

REEL

ASSIST

MOTOR

REEL

MOTOR

[ace

NTI

SEL

iS]

Ure

tesa

steps

Saat

BIS

‘S

CAPSTA

{

30]

MOTOR

CAP

CONTROL

Fa;

Ter

321

Veg

Stk

MECHANICAL

POSITION

CODE

QO701

#23

#24

#25

Mode

PLAY

—

PAUSE

STOP

H H

FF,

REW

cS)

ono

o~o

60]

o~o

so]

Sea

TEST

TIMER TIMER

53)

T~B

REC

4MHz

50}

+5V

28]

a7]

45)

kale

ss)

NRSC

lee

if)

TA-2550

PAUSE

LED

AMCS

FWD

AMCS

BACK

ACCU

START

ACCU

RESET

REPEAT

MONITOR

STO

REW

SYSTEM

RESET

PLAY.

REC

PAUSE

AUTO

SPACE.

OUT

REAL

TIME

COUNTER

+5V

ONRSC

I/O

REMOTE

CONTROL

DECODER

4L-

REMOTE

CONTROL

TA-2550

BLOCK

DIAGRAM

NCHC-3205

(P.B.

AMP)

QUT

rowo

NJM2068MD

ONKYO

NHIC-3205

222078

Lech

PEAK

HOLD

Lech

Rch

PEAK

HOLD

Rch

CX20187

(DOLBY

N.R)

BIC

LINE

Vee

SSK

HPF

TCH2

TCH!

TCL2

Tcl

Wow

HPF

ANTS

arene

IREF

LINE

Vee

MPX

OUT

REC

GNO

LINE

OUT

SSK

131]

HPF

30]

TCH2

[29]

TCHI

[28]

TCL2

26]

TCL

25]

P24)

HPF

123]

ANT

22]

REC OUT

;

HD614128SA41

(COUNTER)

Terminal

Name

and

Function

TA-2550

f-—#—

REMA/CONS

REMA/

CONS

OUT

microcomputer

RES

€7

ADJUST

o~o-4

oom

Le—-ake

uP]

;

rotation

sensor

suey

No.

Name

Function

1~3

Grid

5~7

tube

grid

(DIGIT)

drive

use

output

Vdisp

Input

(FL

tube

use)

for

minus

bias

voltage

Nos.

5,6,9

16,

CONS

tube

display

use

output

(time

lapse)

REMA

tube

display

use

output

(time

remaining)

9~15

a~g

tube

segment

drive

use

output

Colon

tube

“:”

drive

use

output

[418

T,/T2

Microcomputer

/T2

function

selection

input

(With-T,

system

I/O

receiving)

Deck

mechanism

status

input

bit

serial

data)

from

mechanism

control

micro-

abies

computer

CLOCK

Clock

input

for

reading

above

DATA

(DATA

taken

pulse

wave

dropping)

Vee

Microcomputer

power

source

(+5V)

SUPPLY

Cassette

mechanism

tape

feed

side

turning

pulse

input

TAKE

Cassette

mechanism

tape

windup

side

turning

(pulse

input

)

DOM/EX

Domestic/export

setting

use

selector

input

(Tape

size

type

selector

use)

Domestic:

With

power

C46—>

C54

-—>

C60

C80

C90

C120

254

ADJUST

ane

buffer

compensating

value

input

(normally

open,

RESET

Microcomputer

system

reset

TEST

Microcomputer

internal

test

use

port,

normally

connected

Vcc

28,29

OSC1,

OSC2

Microcomputer

clock

oscillator

terminal

GND

Microcomputer

power

source

(GND)

SIZE

Tape

size

selector

input

RESET

Lapsed

time

reset

input

(When

displays,

digits

are

CONS/REMA

Lapsed

time

« +

remaining

time

selector

input

(toggle

display)

BOUT

System

bus

output

BIN

System

bus

input

REMA/CONS

OUT

__|

Remaining

time

display/lapsed

time

display

status

output

(when

T3)

REMA/CONS

Remaining

time

display/Japsed

time

display

status

input

(when

T.)

39~42

Grid

tube

grid

(DIGIT)

drive

use

output

_7-

TA-2550

ADJUSTMENT

PROCEDURES

PRECAUTIONS

Before

adjustment,

clean

the

following

parts

with

alchol

moinstend

swab,

record/playback

head

pinch

roller

erase

head

capstan

not

use

magnetized

screwdriver

for

adjustments.

Demagnetize

record/playback

head

with

head

de-

magnetizer.

TEST

EQUIPMENT/TOOLS

REQUIRED:

Audio

oscillator

Digital

frequency

counter

Oscilloscope

Attenuator

voltmeter

Non-magnetic

screw

driver

Test

tapes

VTT-658

KHz,

—15dB

MTT-1E1

kHz,

—10dB

MTT-150

Dolby

level

calibration

400Hz,

tone

200nWb/m

Item

Connyenion

Line

input

Test

tape

Put

adipsia

Adjust

Remarks

instrument

indicator

point

Frequency

Tape

counter

Frequency

Semi-fixed

3,005

Speed

LINE

output

counter

the

motor

3,010Hz

terminal

sent

ieas

Maximum

and

Head

scope

VTT-658

Head

azimuth

same

phase

Fie

azimuth

voltmeter

screw

channels

LINE

output

LandR

terminal

voltmeter

Playback

terminals

R-107

(Ch.L)

level

TP-1

and

voltmeter

R-108(Ch.R)

245™V

TP-2

;

Level

R-501

(Ch.L)

Meter

MTT-150

eee

R-502(Ch.R)

0dB

NADIS-3339

voltmeter

terminals

METALTAPE|REC

[M0

Minimum

TP-1

and

TP-2

sits

voltmeter

IR-467

terminals

L-409

(Ch.L)

;

R-468

eke

TP-3

and

METS

BES

voltmeter

L-410(Ch.R)

Meautar

counter

TP-4

clock

wise

voltmeter

IkHz,

—20dB

t@LINE

output

and

NEW

XL-I190

REC/PB

panes

wiput

urren

serail

12kHz,

—20dB

voltmeter

-468

(Ch.R)

maximu

REC

Attenutor

350mV

Reged

voltmeter

OSC

output

Input

level

Rig?

Thee

ores

KeCRE

Tae

R-413(Ch.L)

—_|

Same

level

car

voltmeter

R-414(Ch.R)

REC/PB

Blank

tape

NORMAL

.........

UD-1

C-90

PLAY

torque.............

—

60g/cm

HIGH

leas

XL-I

C-90

FF.REW

torque

...........

—

140g/cm

METAL

..........

C-90

Back

tension

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

—

Sg/cm

Aer

ere,

Cee

Calan

ich

acaapeDb

ches

Bebe

daca

TA-2550

NCAF

—

3334

122

REC

LEVEL

Bias

TRAP

R413

(

R416

(R}

aks

(0)

(2)

413

(L)

[e]

R467

(L)

R468

(R)

BIAS

ADJ

LEVEL

TP3

TPS

L609

L410

PRO

RS02

(R)

R501

{L)

METER

NCDIS-3339

OSCILLOSCOPE

OSC

Attenuator

LINE

VTVM

;

OUT

0°

(IN

PHASE)

4s°

90°

180

fig-2

}

Confirming

phase

relationship

fig-1

TA-2550

CHASSIS-EXPLODED

VIEW

LOSE

EET

TENT

ITY

CEE

SRG

CRA

meet

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