Onkyo A-7 Manuale utente

A-/

ONKYO.

SERVICE

MANUAL

INTEGRATED

STEREO

AMPLIFIER

Model

A-/

SPECIFICATIONS

Model

A-7

Integrated

Stereo

Amplifier

Power

Supply

Rating

Controls

Outputs

Inputs

Dimensions

Weight

AC

120

Volts

60

Hz

(USA

Model)

AC

110V/120V/220V/240V

50Hz/60Hz

(Universal

Model)

POWER

SPEAKERS

(OFF,

A,

B,

A+B)

SELECTOR

(PHONO

1,

PHONO

2,

TUNER,

AUX)

TAPE

MONITOR

(TAPE

1,

SOURCE,

TAPE

2)

Total

Harnomic

Distortion

(AUX)

IM

Distortion

(AUX)

(70Hz

:

7kHz=

4:1)

Frequency

Response

Tilt

Signal

to

Noise

Ratio

Damping

Factor

Rated

input

TAPE

DUBBING

(TAPE

2-1,

OFF,

TAPE

Input

Impedance

1-2)

VOLUME,

BALANCE,

BASS,

TREBLE,

TURN

OVER

SWITCH

BASS

(125Hz,

DEFEAT,

400Hz)

TREBLE

(2kHz,

DEFEAT,

8kHz)

MUTING,

LOUDNESS,

MODE,

HIGH

FILTER,

SUB-SONIC

FILTER

SPEAKER

A

&

B,

PHONES

TAPE

REC

1

&

2,

PRE

OUT

PHONO

1

&

2

TUNER

AUX

TAPE

PLAY

1

&

2

MAIN

IN

17t2''(W)

x

64%4''(H)

x

15"°(D)

444

x

159

x

380

mm

29.7

Ibs.

13.5

kg.

Power

Amplifier

Section

Power

Output

(through

AUX

inputs)

70

watts

per

channel,

min.

RMS,

at

4

Ohms

both

channels

driven,

from

20

Hz

to

20

kHz,

with

no

more

than

0.1%

total

harmonic

distortion.

65

watts

per

channel,

min.

RMS,

at

8

ohms

both

channels

driven,

from

20

Hz

to

20

kHz,

with

no

more

than

0.1%

total

harmonic

distortion.

75

watts

per

channel,

min.

RMS,

at

4

ohms

both

channels

driven,

1

kHz,

0.1%

total

harmonic

distortion.

68

watts

per

channel,

min.

RMS,

at

8

ohms

both

channels

driven,

|

kHz,

0.1%

total

harmonic

distortion.

Load

Impedance

Preamplifier

Section

Input

Sensitivity

&

Impedance

Total

Harmonic

Distortion

IM

Distortion

(70Hz

:

7kKHz

=

4:1)

Frequency

Response

Phono

Overload

Signal

to

Noise

Ratio

Output

Voltage

Output

Impedance

Tone

Control

Turnover

Frequency

Filters

Muting

Loundness

(—40

dB)

BASS

TREBLE

SUBSONIC

HIGH

0.1%

at

rated

power

0.08%

at

1

watt

output

0.1%

at

rated

power

0.08%

at

1

watt

output

2-80,000

Hz

(+1

dB)

better

than

5%

at

50

Hz

110

dB

(IHF

A

NETWORK)

50

at

8

ohms

1.5

volts

100

k-ohms

4—16

ohms

PHONO

1

&

2:

2.5mV,

50

k-ohms

TUNER:

150mV,

50

k-ohms

AUX:

150mV,

50

k-ohms

TAPE

PLAY

1

&

2:

150mV,

50

k-ohms

0.05%

at

rated

output

0.08%

at

rated

output

PHONO:

+0.2

dB

at

30—15,000

Hz

AUX:

+0,

—1

dB

at

10—50,000

Hz

230mV

RMS.

at

1

kHz,

0.1%

THD.

PHONO:

80

dB

(THF

A

NETWORK)

AUX:

90

dB

(IHF

A

NETWORK)

1.5

volts,

max

15

volts

2.7

k-ohms

+10

dB

at

100

Hz

(turnover

at

400

Hz)

+10

dB

at

10

kHz

(turnover

at

2

kHz)

BASS:

400

Hz,

125

Hz

TREBLE:

2

kHz,

8

kHz

10

Hz

(6

dB/oct.)

5

kHz

(6

dB/oct.)

—20dB

.

+5

dB

at'100

Hz

+5

dB

at

10

kHz

Specifications

are

subject

to

change

without

notice.

ONKYO.

AUDIO

COMPONENTS

A-/

SERVICE

PROCEDURES

1.

Checking

the

operation

of

the

protective

circuit.

The

protective

circuit

of

the

A-7

works

in

the

follawing

manner:

A

fuse

burns

out

if

speaker

of

too

low

impedance

are

con-

nected,

or

if

the

speaker

wires

are

accidentally

shorted.

A

relay

cuts-off

output

from

the

amplifier

if

due

to

malfunction

DC

current

appears

at

the

output

terminals.

The

relays

will

also

be

actuated

in

the

event

of

excessive

output

current.

A

check

of

the

protective

circuit

is

made

by

placing

the

unit

in

the

following

sequence

of

settings.

1)

2)

3)

4)

5)

No

load.

Set

all

controls

at

the

levels

set

on

the

power

amplifier

(refer

to

power

amplifier).

Set the

SELECTOR

switch

to

PHONO.

Apply

a

5Hz,

1V

(RMS)

sine

wave

to

the

PHONO

inputs.

Gradually

increase

the

setting

of

the

master

volume

control.

The

protective

circuit

relay

should

activate

as

a

result

of

this.

Note:

Operation

of

tht

protective

circuit

relay

can

also

be

checked

by

setting

the

center

voltage

at

DC

4V

and

removing

the

fuses

F701

and

F702,

and

then

applying

a

DC

+5V

voltage

to

the

output

terminals.

This

should

actuate

the

relay.

2.

1)

2)

3)

4)

Checking

the

circuit

board

of

the

power

amplifier.

Remove

two

lower

screws

from

the

heat

sink.

Remove

two

screws

on

the

back

of

the

heat

sink.

Remove

two

heat-sensor

transistors

Q613

and

Q614

from

the

heat

sink.

If

they

cannot

be

pulled

out,

remove

two

mounting

screws

from

the

transistor

sockets.

The

check

can

also

be

performed

by

fastening

it

as

shown

in

Fig.

1

with

screws

that

have

been

removed.

Screw

Fig.

1

The

screws

used

to

fasten

the

bus

grounding

strips

and

the

terminals

of

the

power

supply

electrolytic

capacitor

have

can

influence

sound

quality.

They

must

be

tightened

securely.

When

replacing

differential

amplifier

or

push-pull

amplifier

transistors,

be

sure

that

transistors

of

both

channels

have

the

same

hrg

ratings.

COMPONENT

LOCATION

Tapping

Screw

4STR+12BQ

PARTS

LIST

REF.

NO.

STOCK

NO.

DESCRIPTION

REF.

NO.

STOCK

NO.

DESCRIPTION

l

28184017A

Top

Cover

12

250126

Headphone

Jack

3P64M

2

838440109

Screw

4TTB+10C

(BC)

13

28320155

Knob-Volume

12829121

Front

Panel

Ass'y(3

~

7)

14

28320158

Knob-Selector

3

27210069

Front

Panel

15

28320157

Knob-Level

4

—27265009A

Ring

16

28320161

Knob-Tone

5

27267014

Knob

Guide

17

38320163

Knob-Shift

6

28198502

Facet

18

28320162

Knob-Push

7

27267015

Knob

Guide

19

28320159

Knob-Power

8

27170019

Bottom

Board

20

28320160

Knob-Push

9

280379

Leg

21

838130062

Tapping

Screw

3STBt6BQ

10

831130082

Tapping

Screw

3STW+8BQ

22

270611

Pilot

Lamp

Cover

11

832140122

COMPONENT

LOCATION

21

22

PARTS

LIST

REF.NO.

STOCK

NO.

]

12829576A

2

12829575A

3

12838573

4

128385741

5

128385742

6

2200592

or

2200593

7

2200582

or

2200583

8

27150048

9

230187

10

3504097

11

25035050

12

5104041

13

25030073

14

25055015

15

25045029

16

25045025

17

250170

18

25045022

19

25060008

20

25060023

21

25050004

22

252020

23

3504012

TP

Universal

Model

DESCRIPTION

Main

Amp.

P.C.B.

NAMA-376a

Rectifier/Preamp

P.C.B.

NAAF-375a

Switch

P.C.B.

NATM-373

Treble

Control

P.C.B.

NATS-374

Part

1

Bass

Control

P.C.B.

NATS-

374

Part

2

Power

Amp.

Transistor

28D426

(R)

or

2SD426

(O)

Power

Amp.

Transistor

25B556

{(R)

or

2SB556

(Q)

Shielded

Plate

Power

Transformer

NPT-608D

Elect.

Capacitor

25000uF

55V

Power

Switch

NPS-111-L15P

Variable

Resistor

N35

DGR32C100KT30M,

Volume

Control

Rotary

Switch

NRS-124-30Y,

Speaker

Selector

Connection

Bar

TAPE,

PRE

OUT,

MAIN

IN

Terminal

TUNER/AUX

Input

Terminal

NPJ-4PRBLO03

Phono

Terminal

NTM-2WPBL-E1

Tape

Terminal

NPJ-6PRBLO3

Ground

Terminal

Speaker

System

Terminal

NTM-4PRMNO1

Fuse

Holder

with

Cover

Speaker

Fuse

5A-T

UL

Capacitor

0.01uF

125V

TOP

VIEW

REF.

NO.

STOCK

NO.

24

27160019

25

250249

26

27140122

27

27140123

28

2714008SA

29

27140157

30

25060025

31

27150055

32

27115014A

33

27110031

34

28140024

35

210015A

36

27120069

51

25050015

52

270025

53

253072

54

250080

-35

252049

—

31

a

54

51

52

53

2

USA

Model

12

DESCRIPTION

Heat

sink

Power

Transistor

Socket

M-1614

Heatsink

Bracket

Left

Heatsink

Bracket

Right

Transistor

Socket

A

Transistor

Socket

B

7P

Lug

Plate

Shielded

Plate

Side

Bracket

Front

Bracket

Cushion

6.3V

50mA

Power

Indicator

Lamp

Back

Panel

AC

Outlet

NSCT-6P01

Strainrelief

SR-3P4

AC

Cord

AS-UC

AC

Fuse

Holder

S-N1301

AC

Fuse

4A

ST-6

The

Universal

type

differs

from

the

UDN

type

(USA

model)

at

the

following

points.

9

11

23

36

51-55

61

62

63

230188

25035051

3500052

27120071

250186

25050018

252003

Power

Transformer

NPT-608ADGQ

Power

Switch

NPS-]21-L16P

IS

Capacitor

PME271

YSIOCEE

Back

Panel

none

VS

Socket

S-17205-7

3P

Inlet

Fuse

3A-T

MAIN

AMP.

(NAMA-376a)

MAIN

AMP,

PC

BOARD-PARTS

LIST

CIRCUIT

NO.

Q601~Q604

Q605~Q608

Q609.

Q610

Q611,

0612

Q613,

Q614

Q615,

Q616

Q617,

Q618

D601~D604

STOCK

NO.

Transistors

2210754

2210755

7

2211084

2211085

°*

2211032

2211033

°*

9211022

2211023

2210743

2210744

°F

2200364

2200354

Diodes

223105

DESCRIPTION

erent

or

Differential

Amp.

See

SAE

or

Differential

Amp,

A912

ree

Driver

Amp.

25C1885(Q)

:

2§C1885(R)

Driver

Amp.

28094

P

Scat

oO)

Bias

Stabilization

28D358(D)

Complement

2SB528(D)

Complement

181555

BOTTOM

VIEW

CIRCUIT

NO.

L601,

L602

C605,

C606

C619,

C620

C625,

C626

C631,

C632

C633~C636

R607,

R608

R645,

R646

R651,

R652

R657,

R658

R659~R662

STOCK

NO.

Coils

2310601

Capacitors

390480477

352744711

374121045

374121044

352770331

DESCRIPIION

$-1.3B

4.7pF

50

LD

470uF

1€V

EL

O.1uFt10%

50V

DE

O.1uF+

5%

50V

DE

3.3uF

63V

EL

Variable

Resistors

§221008

§221007

Resistors

451630274

48114795

R-HK4.7KB38S

CENTER

VOLTAGE

R-HK2.2F.B3S8

IDLING

CURRENT

2.7

ohm

1W

Metal

0.47

ohm

SW

Cement

NOTES:

When

replacing

differential

amplifier

or

push-pull

amplifier

transistors,

be

sure

that

transistors

of

one

channel

have

the

same

hrg

ratings.

MAIN

AMP.

ALIGNMENT

NOTES:

1,

Set

up

A-7

as

follows:

SELECTOR...

AUX

TONE

SHIFT....

DEFEAT

TONE

&

BALANCE

..,

Center

FILTER/LOUDNESS/DUBBING

..,

OFF

MODE

.,,.STEREO

T.MONITOR

...

SOURCE

SPEAKERS...

OFF

VOLUME

...

Maximum

(0dB)

2.

Adjust

after

switching

on

for

3

minutes,

1.

IDLING

CURRENT

ADJUSTMENT

Connect

the

DC

Voltmeter

between

Ipp

and

V7

terminals.

Adjust

the

Voltage

to

17£2mV

with

R645.

(Left

channel)

Adjust

the

Voltage

to

17£2mV

with

R646,

(Right

channel)

2.

CENTER

VOLTAGE

ADJUSTMENT

Connect

the

DC

Voltmeter

between

Vey

and

E

terminals.

Adjust

the

Voltage

to

0+5mV

with

R607.

(Left

channel)

Adjust

the

Voltage

to

0t5mV

with

R608.

(Right

channel)

CIRCUIT

NO,

R663,

R664

R667,

R668

R671,

R672

STOCK

NO.

Resistors

451630684

451731004

441521014

Themistors

TH601,TH602

4000003

DESCRIPTION

6.8

ohm

]W

10

ohm

2W

100

ohm

1/2W

D-22A

SWITCH

PC

BOARD-PARTS

LIST

Rotary

Switches

NRS-1

44-30ZL

25030069

25030068

NRS-143-30A

Metal

Métal

Oxide

Film

SELECTOR

i

5,

3O

DUBBING

MONITOR

TONE

CONTROL

PC

BOARD

—

PARTS

LIST

Capacitors

C403,C404

374122044

O.2uF+5%

SOV

DE

C407,C408

374121144

O,lipFt5S%50V

DE

C409,C410

390882207

22uFt50V

SLD

C413,C414

372328214

820pF*5%50V

ST

Rotary

Variable

Resistors

R40]

5104042

GH30E-196K

x

2

BASS

R413

5104043

GH30E-171K

x

2

TREBLE

Rotary

Switches

$401,S8402

25030072

NRS-143-30ZV

FREQUENCY

SHIFT

Capacitor

a

DE:

Non-Inductive

Polyester

Film

Capacitor.

LD,

SLD:

Low

Leakage

Current

Type

Electrolytic

Capacitor.

ST:

Polystyren

Film

Capacitor.

EL:

Electrolytic

Capacitor.

BOARD

VIEW

EQUALIZER/TONE

AMP.

PC

BOARD

(NAAF-375a)

ee

ae

I

ee

el

CIRCUIT

NO.

STOCK

NO.

DESCRIPTION

EG

eUPMOISERNG,

GESCRIDLON

CIRCUIT

NO.

STOCK

NO.

DESCRIPTION

3210668.

28A841

(GR)

jetta

ae

|

C501,¢502

352782211

|

220uF

SOV.

EL

vaos

gute

HOG,

BAe

poueeam,,

Deot,ps0z

daeois

—

waaso

OTE

ote.

ff

a

Q205,Q206

d51q666

%

IsaRd1

(BL)

Of

Equalizer

Amp.

D701—D704

ae

a

ERD

bt

ae

er

scr

oe

Me

Q207,Q208

3315676

%

Secieal

(pry

Equalizer

Amp.

D705,D706

223802,

181885

C707

352744701

4

7uF

16V

EL

223801

°

10D1

Q209,

Q210

eeeee

or

281318

(Q)

or

Equalizer

Amp.

Resistors

|

2211043

28C1318

(R)

Capacitors

:

5148013

:

$3

211,Q212

2211052

284720

(Q)

eanayeek

peeoas

R305

are

N16RGL250KMN30O,

Variable,

BALANCE

ms

2211053"

SSA720.GR).

OP

ea

ANSE

nee

©303,C304

320480227

2.2uE

—

50V

LD

R503,

R504

441521514

1500hm

1/2W

Metal

Oxide

Film

/.a0

2210665,

=

2SA841

(GR)

C203.C204

4.

R701

441622014

200ohm

1W

Metal

Oxide

Film

Q301-9304

2210666,

=

2SA8d1

(BL)

Differential

Amp

C305,c300,

eS

ey

EE

R711,R712

441623914

3900ohm

1W

Metal

Oxide

Film

2210416

5

2SA726(F)

9.

C211,C212

390883317

330uF

50V.

SLD

R713

441721824

1.8kohm

2W

—

Metal

Oxide

Film

Pi

Geee..

SECC

RS

€213,C214

374124724

4700pF

45%

SOV

DE

Fae

305

374125624

S600pF

+5%

50V

ODE

witches

teehee

<22t0gTee

DSc

lesl

(BE)

c

1

UAEvR:

ou

Gis

eae

$301~$305

25035039

NPS-542-L04

Push

2200663

2S8C1626

(O)

sa

374121534

O.015uF

+5%

SOV

DE

Q501

or

Rectifier

C219,

C220

2200664

28C1626

(Y)

C225,

C226

|

Relay

2200673

2SA816

(0)

cia

2.60

390480107

uF

50V.

LD

hiSai

Ores

NRS2P5A-DC12

Q502

or

Rectifier

<-

C317,C318

er00aI

A

easly)

C315,C316

352722211

220uF

63V

EL

27300059

Ground

Plate

ee

ae

a

C319,C320

390480477)

4.7uF

SOV

LD

27150049

Shielded

Plate

701~

545.

O.15uF

+10%

sov

DE

OID

ie

0703:

Fs

ae

og

28C828A

(0)

Protector

C321,C322

3741215

u

2210362

2SC828A

(R)

fae

ae

ac

BSCS

AWD:

ene

DE:

Non-Inductive

Polyester

Film

Capacitor.

.

LD,

SLD:

Low

Leakage

Current

Type

Electrolytic

Capacitor.

NOTES:

When

replacing

differential

amplifier

or

push-pull

amplifier

transistors,

be

sure

that

transistors

of

one

channel

have

ST:

Polystyren

Film

Capacitor.

the

same

hg

ratings.

EL:

Electrolytic

Capacitor.

SCHEMATIC

DIAGRAM

8

be

82

C209

47P(K)

FBitn)

GERD

C

rags

R217

R219

100KIG)

3.9K

aaah

Q209,021

a210

Sooo

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wound

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which

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shorting

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phono

terminals.

PARTS

LIST

REF.NO.

STOCK

NO.

DESCRIPTION

REF,

NO.

STOCK

NO.

DESCRIPTION

la

29340193

Instruction

Manual

10

25055018

CV-K-],

Conversion

Plug

lb

29340195

Instruction

Manual

11

290008

500

x

1000

(m/m),

Sheet

2

29358001

Service

Station

List

12

29100027

850

x

650

(m/m),

Poly

Bag

3

29355046

Caution

Card

for

Warranty

Card

13

282969

Caution

Label

A

4

29365003

Warranty

Card

14

293041]

Caution

Label

5

252049

4A,

ST-6,

Fuse

15

29050112

Carton

Box

6

252020

SA-T,

Fuse

16

29090178

Pad,

Left

7

29100006A

250

x

350

(m/m),

Poly

Bag

17

29090179

Pad,

Right

8

253083

Power

Supply

Cord

250153

Shorting

9

293268

Tag,

Voltage

29380025

Tag,

Cabinet

Composite

19

29100002

150

x

80(m/m),

Poly

Bag

—||]—

Onkyo A-7 Manuale utente

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