Onkyo A-8870 Manuel utilisateur

ONKY-00296

Ref.

No.

3404

ONKYO.

SERVICE

MANUAL

integrated

Stereo

Amplifier

MODEL

A-8870

Black

and

silver

models

SAFETY-RELATED

COMPONENT

WARNING!!

TAB

CONTE

NTS

COMPONENTS

IDENTIFIED

MARK

THE

SCHEMATIC

DIAGRAM

AND

THEPARTS

LIST

ARE

CRITI-

Specifications

.05

h35.

ees

aise

oes

Saas

See!

ESS

CALFOR

RISK

FIRE

AND

ELECTRIC

SHOCK.

REPLACE

Precautions:

i.cccc

standin

aset

add

tol

cage

Oia

awowe

eal

THESE

COMPONENTS

WITH

ONKYO

PARTS

WHOSE

PARTS

Adjustment

procedures

.......

0.0

cece

eee

cee

NUMBERS

APPEAR

SHOWN

THIS

MANUAL.

block

diagram:

a...

dies

EAS.

Kee

ete

MAKE

LEAKAGE-CURRENT

RESISTANCE

MEASURE-

Block

diagram

........

ccc

ences

etna

ence

ten

enenes

MENTS

DETERMINE

THAT

EXPOSED

PARTS

ARE

AC-

Chassis

exploded

view

1.0.0...

ccc

cece

eee

tees

CEPTABLY

INSULATED

FROM

THE

SUPPLY

CIRCUIT

Printed

circuit

board

parts

list

0.0...

ccc

eee

BEFORE

RETURNING

THE

APPLIANCE

THE

CUS-

Printed

circuit

board

View

2...

eee

TOMER.

Schematic

diagram

2...

600s

cscs

eee

eer

beeen

neeee

Packing

part

list

isis

aeeaie

wget

bere

agecdiaes

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O44

wien

steyy

Front

panel

facilities

0.0...

cece

eee

nets

System

CONNECTIONS

©...

eee

nets

ONKYO

AUDIO

COMPONENTS

A-8870

SPECIFICATIONS

Power

Output:

105

watts

per

channel,

min.

RMS,

ohms,

both

channels

driven

from

kHz,

with

than

0.008%

Total

harmonic

distortion.

Dynamic

Power:

303

watts

ohms,

235

watts

ohms

155

watts

ohms

Total

Harmonic

Distortion

0.008%

rated

power

0.008%

watt

output

Intermodulation

Distortion:

0.005%

rated

power

Damping

Factor:

150

ohms

kHz)

Input

Sensitivity/

Phono

(MM):

2.5

mV/50

kohms

Impedance:

Phono

(MC):

160

1V/130

ohms

CD:

150

mV/30

kohms

TUNER:

150

mV/30

kohms

Tape

Play:

150

mV/30

kohms

Output

Level/Impedance:

Tape

Rec:

150

mV/1.0

kohms

(Phono)

Phono

Overload:

Phono

(MM):

200

RMS.

kHz,

0.012%

THD.

Tone

Control

{Vol

-20

dB):

BASS:

100

TREBLE:

kHz

High

Cut:

kHz

dB/Octave)

(TREBLE

min.)

Frequency

Response:

CD,

Tuner:

Hz-50

kHz

(+0,

dB)

RIAA

Deviation:

Phono

(MM):

+0.3

dB,

20 Hz

~20

kHz

Subsonic

Filter:

20Hz

(-3dB,

6dB/Oct)

Signal

Noise

Phono

(MM):

(5.0

input)

Ratio

(\HF-A):

Phono

(MC):

(0.5

input)

(DIRECT):

107

Attenuator:

-20

Muting:

Power

Supply:

European

models:

AC230V,

50 Hz

Dimensions

D):455

170

420

17-15/16"

6-11/16"

16-9/16"

Weight:

16.7

Specifications

and

features

are

subject

change

without

notice.

PRECAUTIONS

Replacing

the

fuses

For

continued

protection

against

risk

fire,

replace

only

with

same

type

and

same

rating

fuse.

CIRCUIT

NO.

PART

NO.

DESCRIPTION

F901

252075

2.5A-SE-EAK,

Primary

fuse

F902

252077

4A-SE-EAK,

Primary

fuse

A-8870

ADJUSTMENT

PROCEDURES

Adjustments

and

Checking

the

Protection

Circuitry

Preparations

Place

the

unit

the

workbench.

(There

should

about

space

between

the

base

plate

the

unit

and

the

work

surface.)

Set

the

unit

follows.

(1)

load

(2)

signal

(3)

Volume

turned

all

the

way

down

(4)

Speaker

switch

OFF

(5)

Power

switch

OFF

Note)

Check

the

following

points

before

making

adjustments

(1)

The

power

switch

should

OFF.

(2)

The

interior

the

unit

should

not

warm.

Idling

current

adjustment

Turn

the

power

switch

and

allow

the

unit

warm

for

about

minutes.

(1)

Adjust

R535

(R536)

that

the

voltage

test

point

VCT-IID

the

NAAF-4209

circuit

board

I5mV+5mV,

Note)

Semi-fixed

resistors

enclosed

parentheses

(

)

are

for

the

right

channel.

Check

operation

protection

circuitry

Check

operation

protection

relay

(1)

Confirm

that

the

relay

turns

approximately

seconds

after

the

power

switch

turned

ON.

(2)

The

SERVO

indicator

LED

should

light

the

same

time.

(3)

The

relay

should

turn

OFF

approximately

0.5

seconds

after

the

power

switch

turned

OFF.

Check

detection

and

servo

circuitry

operation

(1)

Turn

the

power

with

load.

(2)

After

the

speaker

relay

turns

ON,

apply

DC+200mV

the

input

terminals.

Confirm

that

the

relay

turns

OFF.

(3)

Confirm

that

operation

the

same

(2)

above

when

input

DC—200mV

applied.

Note)

Under

circumstances

connect

load

short

the

speaker

terminals

when

performing

the

above

test.

Signal

input

from

the

circuit

illustrated

below

with

load.

(1)

Confirm

that

the

speaker

relay

does

not

turn

OFF

even

when

ohm

load

connected

when

peak

value

30Vp

Output.

(2)

Next,

confirm

that

when

ohm

load

connected

the

speaker

relay

switchse

OFF

and

couple

oftames

and

then

stays

OFF.

Note)

The

period

before

that

relay

stays

OFF

should

not

last

for

than

minute.

Relay

OFF

status

can

canceled

switching

the

power

OFF.

Low-frequency

oscillator

Auplifier

Load

OUT

resistance

Differe-

ntiator

Attenua~

tor

Square

wave

The

unit’s

volume

50Hz,

1!0V¥

p-p

control

may

also

used.

Oscillo-

scope

3.3

0.1

3.3

OUTPUT

Square

wave

input

from

low-frequency

oscillator

Hz,

10V

p-p

A-8870

BLOCK

DIAGRAM

RECMUT

TMP47C440AN

(Microprocessor)

INPUT

SELECTOR

}

+5V

+5.6V

TMP47C440AN

+5V

BACKUP

POWER

INPMUT

REC

MUT:

;

VOL

UP/DOWN

SEL

UP/DOWN

6p—

_—'!_hoxa

Ley

8 |

Lepe=

Description

Analog

reference

voltage

for

A/D

conversion

Analog

reference

GND

for

A/D

conversion

Input

Selector,

Power

key

input

terminal.

read

Input

Selector

and

Power

key

means

A/D

conversion

Muting

output

terminal

for

Main

amplifier

input.

Active

“H”

Muting

output

terminal

for

Rec.

output.

Active

“H”

output

when

switching

Input

Selector.

output

continuously

case

Input

Selector

TAPE-1,

TAPE-2,

DAT,

and

DIGITAL-4.

Contro!

output

terminal

for

PLAYER.

PLAYER

“L”

will

output

for

200ms

input

K64

code

for

remote

control

and

set

Input

Selector

for

PHONO.

VOL

DOWN

UP/DOWN

output

terminal

for

volume.

Active

“H”

case

(DOWN),

VOL

outpout

will

“H”

(“L”),

while

VOL

DOWN

output

will

“L”

VOL

(“H").

When

not

moving,

both

outputs

shall

“H”

(Brake).

;

SEL

DOWN

UP/DOWN

output

terminal

for

Input

Selector.

Active

“H”

case

(DOWN),

SEL

output

will

“H”

(“L”),

While

SEL

DOWN

output

will

“L”

(“H”).

SEL

When

not

moving,

both

outputs

shall

“1H”

(Brake).

; a

Gor

aes

Output

terminal

for

switching

digital

signal.

Switch

follows

through

the

position

Input

Selector.

Input

selector

Output

DIGITAL-|

DIGITAL-2

DIGITAL-3

DIGITAL-4

Others

(Analog)

EXP/JPN

Input

terminal

for

remote

control

initialization

when

energizing.

—~4-

A-8870

No.

Symbol!

Description

DIG-4/MODE

Output

terminal

for

Input

Selector

display.

Output

the

position

currently

selected

will

“L”

DIG-3

(lighted).

DIG-2/AUX-2

DIG-4/MODE

output

will

input

terminal

MODE

for

initializtion

operation

switch

when

RIG

aU)

energizing.

Outtput

DIG-1/AUX-1,

DIG-2/AUX-2

will

switched

initializing

MODE

into;

TUNER

DIG-1/AUX-1

DIG-2/AUX-2

AUX-1

AUX-2

DIG-1

DIG-2

GND

terminal

PHONO

DAT

Output

terminal

for

Input

Selector

display.

TAPE-1

The

output

the

positon

currently

selected

will

“L

(lighted).

TAPE-2

ENCD!

ENCD2

Input

terminal

for

detecting

position

rotary

input

Selector.

ENCD3

connected

with

Encoder

output

for

position

detecting

Rotary

sw.

ENCD4

TEST

connected

with

GND.

XIN

;

: ; '

Terminal

for

connecting

with

ceramic

oscillator

MHz)

XOUT

RESET

Input

terminal

for

reset

signal.

Active

“L”

Input

terminal

for

detecting

power

suspension.

POFF

Take

countermeasure

soon

possible

against

power

failure

when

turned

into

“L”.

Setat

HOLD

mode.

Input

terminal

for

detecting

Rotary

position

Input

Selector.

ENCDS

‘

connected

with

Encoder

output

for

position

detecting

Rotary

sw.

__—---|___-

SYS

OUT/SYS

Ouptut

terminal

for

System

code.

Active

“L”

turned

into

SYS

for

initialization

input

when

energizing.

REM

Input

terminal

for

remote

control

signal.

Active

connected

with

output

photoreceivin

unit.

SYS

Input

terminal

for

System

code.

Active

“H”.

IND

Output

terminal

for

Muting

display.

Lighted

case

“L”

set

“L”

when

Muting

remote

control

ON.

Output

terminal

for

Standby

display.

Lighted

incase

“L”

STANBY

turned

into

“L”

when

Power

OFF.

Except

the

case

power

susupension,

the

level

inverted

Power

output

always

output,

POWER

Output

terminal

for

Power

control.

““L”

When

Power

VDD

Power

(+5V)

Conntecting

terminal.

LB1638

(Motor

drive)

Tauth

Table

OUT

OUT2

OUT1}OUT2|

t-F

—_

NORMAL

REVERSE

A-8870

TA7291S

(Motor

drive)

M51943BSL

(System

reset)

+tnput

]

10]

INPUT

~tnPUT

2[6]

-INPUT

OUTPUT

Jourtput

TA7317P

(Protective

circuit)

REGULATOR

CIRCUIT

SHUMITT

RELAY

DRIVE

CIRCUIT

POWER

ON-OFF

DETECTION

CIRCUIT

OVER

CURRENT

OETECTION

CIRCUIT

DIRECT

VOLTAGE

OETECTION

OISCHARGE

CIRCUIT

SuB

STRAIGHT

-----

~O-

A-8870

BLOCK

DIAGRAM

REC

SELECTOR

SOURCE

DIRECT

POWER

AMP.

RECO

VOLUME

RELAY

TAPE

R321

-——_————_©

-2

PLAYO

Q803

REBSI

SPEAKERS

MOTOR

DRIVE

RLe@52

COM

RECO

Rch=—y

PHONES

TAPE-—

VFS

ATTENUATOR

BALANCE

TONE

PLAY©)

CONTROL

SUBSONIC

PROTECTOR’

62)—

+B6

Q<)

MODE

ase

QB53

COM

REC

TREBLE

BASS

OS)

2810.

0852

Bee

™

aeo7

POWER

BUS

LINE

Q80!

Qsil

eB!l2

PLAYO

ROTARY

ENCODER

MICRO

PROCESSOR

EQUALIZER

—ine

35.

26~29

PHoNo

©—{X)

carTRIDGE

N.S

siol

TUNER

Aux-1

INPUT

PowER4-

seLector

(¥)(¥)

$852

MIND

+BIO

SYSTEM

aeos

VOLTAGE

Q805

-~8-

ONKY-00296

Druck:1

A-8870

CHASSIS-EXPLODED

VIEW

A047

A304

A006

UOI5

P005

P903

u002

A044

T901

AQl6

A012

=49=—

ONKY-00296

Druck:2

A-8870

CHASSIS

EXPLODED

VIEW

PARTS

LIST

REF.

NO.

PART

NO.

DESCRIPTION

REF.

NO.

PART

NO.

DESCRIPTION

A00!

27110588-1C

FRONT

BRACKET

A632

27170272A

BOTTOM

BOARD

(R)

A002

27270212

SPACER

A633

28141024

240

2.5T,

CUSHION

A003

27270326A

SPACER

(VOL)

A634

27270212

SPACER

A006

QN21479A

BACK

PANEL

A636

27175251

LEG

ASS'Y

A009

28140859

6020

1.5T,

CUSHION

A810

28324083A

KNOB

(VOL)

[BLK]

AOIO

28140695

25x

240

X1.5T,

CUSHION

A810

28324413A

KNOB(VOL)

[SIL]

AOL

27130622A

BRACKET

(SHIELD)

A811

28324084A

KNOB

(SEL)

[BLK]

A012

27130623

BRACKET

(L)

A8II

28324084-2

KNOB

(SEL)

[SIL]

A013

27130624

BRACKET

(R)

A812

28324085B

KNOB

(D)

[BLK]

AOI4

27130656A

BRACKET

(C)

A812

28324085-2

KNOB

(D)

[SIL]

AOIS

28170025

BUSHING

A813

28324086

KNOB

(SP)

[BLK]

AOI7

27130627

BRACKET

(EQ)

A814

28324411

KNOB

(TONE)

[BLK]

A020

27300833

WS-2NS,

CRAMP

A814

28324412

KNOB

(TONE)

{SIL]

A022

27300750

#2271,

BUSHING

(AC

CORD)

ARIS

283240884

KNOB

(PUSH)

[BLK]

A023

27270213

SPACER

(PT)

A8I5

28324417

KNOB

(PUSH)

[SIL]

A024

27301394

HL-18-0,

CRAMP

Q609,

Q613

2201703

2SC3855-O

A026

27160282

RADIATION

Q614,Q610

2201706

2SC3855-P

A027

27160283

RADIATION

2201704

2SC3855-Y,

TRANSISTOR

A029

27301328

BFG-20,

RADIATION

SHEET

Q611,Q615

2201693

2SA1491-O

A030

28140808

50x50

3T,

CUSHION

Q616,Q612

2201696

2SAI491-POR

A035

800529

BUSHING

(PC)

2201694

2SA1491-Y,

TRANSISTOR

A038

82143006

3P+6FN(BC),

PAN-HEAD

SCREW

Avot

300707

NPT-1116P,

POWER

A039

801433

3SMS8WSW+14B(BC),

SPECIAL

TRANSFORMER

[P]

TAP-TIGHT

SCREW

S10}

25030348

NRSF-102-20BU,

SWITCH

A042

834430088

3TTS+8B(BC),

TAP-TIGHT

SCREW

OPERATION

SECTION

A043

831130088

3TTW+8B,

TAP-TIGHT

SCREW

$281

25030349

NRSF-104-20BU,

SWITCH

A044

830440109

4TTC+10C(BC),

TAP-TIGHT

OPERATION

SECTION

SCREW

P00S

25060044

TERMINAL

(GROUND)

A045

801230

3STS+8BQ(BC),

TAP-TIGHT

A\P901,

P902-——-

25050337

NSCT-2P

164,

SOCKET

SCREW

p903

253148

AS-CEE

A047

838440089

4TTB+8C(BC),

TAP-TIGHT

SCREW

253150

AS-CEE,

POWER

SUPPLY

CABLE

A049

831430088

3TTW+8B(BC),

TAP-TIGHT

SCREW

F901

252075

2.5A-SE-EAK,

FUSE

AOS!

837440169

ATTT+16C(BC),

TAP-TIGHT

F902

252077

4A-SE-EAK,

FUSE

SCREW

u00!

1A295509-1A

NAAF-4209-1A,

MAINCHRCUIT

A303

28184464

TOP

COVER

BOARD

ASS’Y

A304

27265155A

COSMETIC

RING

(COVER)

u002

1A295510-IA

NAETC-4210-IA,

SPEAKER

A305

28140695

25X240

1.5T,

CUSHION

TERMINAL

BOARDASS’Y

A306

28140693

10x185

X1.5T,

CUSHION

A307

28141009

125

195X1.5T,

CUSHION

ate

Negtleane

pane

A500

1A295121

FRONT

PANEL

ASS’Y

[BLK]

U005

1A293513-1

NAPS-4213-1,

POWER

SUPPLY

(A511)

27265219

COSMETIC

RING

(L)

[BLK]

CIRCUIT

(1)

BOARD

ASS'Y

(A512)

27265224A

RING

ASS’Y

(SEL)

006

1A295514-1D

NAETC-4214-1D,

POWER

SUPPLY

CIRCUIT

(2)

BOARD

SS’Y

(A516)

28198742

FACET

(A518)

27265223

COSMETIC

RING

(D)

[BLK]

ees

OREO

pine

eee

(A519)

27265220C

COSMETIC

RING

(R)

[BLK}

ees

ETS

Cee

U008

1A293516-1

NAAF-4216-1,

VOLUM#

DIRECT

(A523)

27265221A

COSMETIC

RING

(VOL)

[BLK]

ARSUIERC

TOS

(A524)

28135199

NAME

PLATE

(A801)

28324082A

KNOB

ASS’Y

(POW)

[BLK]

Moe?

Ugessiet

ean

cay

mente

PEATEMRE)

U010

1A293519-1

NASW-4219-1,

TONE

C)N‘TROL

epee

sere

CIRCUIT

BOARD

AIs’-Y

TRiGS

voll

1A293520-1

NADIS-4220-1,

PHOTORE

CEIVING

A500

14296121

FRONT

RANEL

355

[Sit]

U012

1A293521-1

NaSWdee

Pak

Swit

(A511)

27265219-2

COSMETIC

RING

(L)

[SIL]

CIRCUIT

PCHOMRD

(A512)

27265224-3A

RING

AS3

SEL)

U013

1A293522-1

NADIS-4222-1,

LED

PCBCG®ARD

(A518)

27265223-3

COSMETIC

RING

(D)

[SIL]

wot

ingeee

eae

(A519)

27265220-2A

COSMETIC

RING

(R)

[SIL]

BRA

DISH2

BED

PCICAARD

(A523)

27265221-1

COSMETIC

RING

(VOL)

[SIL]

peas

(A801)

28324414

KNOB

ASS’Y

(POW)

[SIL]

A503

28185359

SIDE

BOARD

(L)

A505

28185360

SIDE

BOARD

(R)

A631

27170271

BOTTOM

BOARD

(L)

-~11-

A-8870

REF.NO.

UOI5

U016

PART

NO.

1A293524-1A

1A295525-1LA

DESCRIPTION

NAETC-4224-

1A,

REMOTE

CONTROL

TERMINAL

BOARD

ASS’Y

NAETC-4225-1A,

TUNER

TERMINAL

BOARD

ASS’Y

NOTE:

[BLK]:

ONLY

BLACK

MODEL

[SIL]:

ONLY

SILVER

MODEL

NOTE:

THE

COMPONENTS

IDENTIFIED

MARK

A\ARE

CRITICAL

FOR

RISK

FIRE

AND

ELECTRIC

SHOCK.

REPLACE

ONLY

WITH

PART

NUMBER

SPECIFIED.

PRINTED

CIRCUIT

BOARD

PARTS

LIST

MAIN

CIRCUIT

BOARD

(NAAF-4209-1A)

CIRCUIT

NO.

Q105,

Q106

Q109

Q110

Q519,

Q520

Q585

Q586

Q851

Q101,

Q102

QL07,

Q108

Q501,

Q502

Q503~Q506

Q507,

Q508

11,

Q512

13,

Q514

Q517,

Q518

Q581~Q584

Q589,

Q601

Q602

Q603,

Q604

Q605,

Q606

Q607,

Q608

Q617,

Q618

Q619,

Q620

Q852

Q853

PART

NO.

ICs

222902

222780205MIT

222790205MIT

222570

22240040

226007

222584

Transistors

2211535

2211536

2211537

2211255

2212805

2212806

2212807

2211733

2211732

2213666

2213667

2211455

2211454

2211354

2211353

2211255

2211256

2211634

2211633

2211354

2211353

2202034

2202035

2202024

2202025

2211634

2211633

2211793

2211792

2212600

2211504

DESCRIPTION

NJMS5532D-D

M5F78M20L

M5F79M20L

NJM4560D-X

NJM2902N

TLP-531

TA7317P

2SK146-GR

2SK

146-BL

2SK146-V

2SC1815-GR

2SK389-GR

2SK389-BL

2SK389-V

2SC1845-E

2SC1845-F

2SA1240-F

2SA1240-G

2SA1015-GR

2SA1015-Y

2SA949-Y

2SA949-O

2SC1815-GR

28C1815-BL

28C2229-Y

2SC2229-O

2SA949-Y

2SA949-O

2SD1763A-D

2S8D1763A-E

2SB1186A-D

2SB1186A-E

28C2229-Y

28C2229-O

28A992-E

2SA992-F

DTAI24ES

2SA950-Y

~12-

CIRCUIT

NO.

Q901

Q902

Q903,

Q904

Q905

Q906

D101~D104

D505,

Q506

D511~D516

D517~D520

D851,

D852

D853

D854

D901~D903

L101,

L102

L601,

L602

L201~L203

C103,

C104

C105,

C106

C107,

C108

C109,

C110

Cli,

Cil2

C113~C116

C17,

C118

C119~C122

C123,

C124

C147,

C148

C149,

C150

C151,

C152

C153,

C154

C155,

C156

C157,

C158

C159,

C160

C501,

C502

C509,

C510

PART

NO.

2201512

2201513

2201502

2201503

2211945

2211255

2211455

Diodes

225251

223163

225251

223163

224450623

223163

224450562

Coils

231133

231134

230905

Capacitors

373631024

373631514

372121014

391222217

372122024

379122434

374724334

391651017

373632224

354764719

354741019

354761019

391254717

354761019

373732234

373631014

DESCRIPTION

2SD1200-Q

2SD1200-R

2SB889-Q

2SB889-R

2SK246-GR

2SC1815-GR

2SA1015-GR

TLRI12,

LED

18S133

TLRI12,

LED

1SS133

MTZ6.2C,

Zener

1S8

133

MTZ5.6B,

Zener

NCHI1188

S-0.8E

BLO2RN1-R62

1000

pF,

100V,

Film

(KP

)

150

pF,

100

Film

(KP)

100

pF,

SOV,

Styrene

220

pF,

6.3,

Elect.(MUSE)

2000

pF,

SOV,

Styrene

0.024

uF,

SOV,

Film

(DIW)

0.043

iF,

SOV,

Film

(TA

100

uF,

25V,

Elect.(FS)

2200

pF,

100V,

Film

(KP

)

470

uF,

35V,

Elect.

100

UF,

16V,

Elect.

100

uF,

35V,

Elect.

470

uF,

25V,

Elect.(MUS

)

100

uF,

35V,

Elect.

0.022

WF,

100,

Film

(if

3KT)

100pF,

100V,

Film

(K})

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