Onkyo A-8800 User manual

A-8800

SERIAL

NO.

3309

ONKYO.

SERVICE

MANUAL

Integrated

Stereo

Amplifier

MODEL

A-8800

120V

AC,

60Hz

220V

AC,

50Hz

240V

AC,

50Hz

120V/220V

AC,

50Hz/60Hz

SAFETY

-RELATED

COMPONENT

WARNING!!

TABLE

OF

CONTENTS

COMPONENTS

IDENTIFIED

BY

MARK

/\

ON

THE

SCHEMATIC

DIAGRAM

AND

IN

THE

PARTS

LIST

ARE

Specifications

CRITICAL

FOR

RISK

OF

FIRE

AND

ELECTRIC

SHOCK.

REPLACE

THESE

COMPONENTS

WITH

ONKYO

PARTS

WHOSE

PARTS

NUMBERS

APPEAR

AS

SHOWN

IN

THIS

Precautions

Adjustment

procedures

MANUAL.

Front

panel

facilities

IC

block

diagram

MAKE

LEAKAGE-CURRENT

OR

RESISTANCE

MEA-

System

connections

SUREMENTS

TO

DETERMINE

THAT

EXPOSED

PARTS

Packing

procedures

ARE

ACCEPTABLY

INSULATED

FROM

THE

SUPPLY

CIRCUIT

BEFORE

RETURNING

THE

APPLIANCE

TO

THE

CUSTOMER.

Chassis

exploded

view

Exploded

view

parts

list

Printed

circuit

board

parts

list

Printed

circuit

board

view

Block

diagram

Schematic

diagram

KYO

May

COMPONENTS

A-8800

SPECIFICATIONS

Power

Output:

Dynamic

Power:

Total

Harmonic

Distortion:

Intermodulation

Distortion:

Damping

Factor:

Input

Sensitivity

Impedance:

Output

Level/Impedance:

Phono

Overload:

Tone

Control:

(Vol-20

dB)

High

Cut:

Frequency

Response:

100

watts

per

channel,

min

RMS.

at

8

ohms,

both

channels

driven

from

20

Hz

to

20

kHz,

with

no

more

than

0.008%

Total

harmonic

distortion.

310

watts

2

homs,

220

watts

4

ohms

0.008%

at

rated

power

0.008%

at

1

watt

output

0.005%

at

rated

power

100

at

8

ohms

Phono

(MM):

2.5

mV/50

kohms

Phono

(MC):

=

1604.V/220

ohms

CD

DIRECT:

150

mV/50

kohms

TUNER:

150

mV/50

kohms

Tape

Play:

150

m¥V/50

kohms

VCR

Play:

150

mV/50

kohms

VDP

Play:

150

mV/50

kohms

Tape

Rec:

150

mV/1.5

kohms

(Phono)

Pre

Out:

1

V/600

ohms

Phono

(MM):

200

mV

RMS.

at

1

kHz,

0.015%

THD.

CONTRABASS:+

10/+20

dB

(Muting:

OFF/ON)

at

20

Hz

BASS:

+10

dB

at

70

Hz

TREBLE:

+8

dB

at

20

kHz

6

kHz

(6

dB/Octave)

(TREBLE

min.

)

CD,

Tuner:

2-50,000

Hz

(+0,

—1

dB)

PRECAUTIONS

1.

Replacing

the

fuses

RIAA

Deviation:

Signal

to

Noise

Ratio

(IHF-A):

Muting

(Vol

-

20

dB):

D/A

CONVERTER

SECTION

Coaxial

Input:

Output:

Optical

Input:

Digital

Sampling

Frequency:

Frequency

Response:

Total

Harmonic

Distortion:

Signal

to

Noise

Ratio:

(IHF-A):

Dynamic

Range

(THF-A):

Max.

Output

Level:

GENERAL

Power

Supply:

Dimensions:

Weight:

Phono

(MM):

+0.3

dB,

20

Hz

—

20

kHz

Phono

(MM):

94

dB

(5.0

mV

input)

Phono

(MC):

=

75

dB

(0.5

mV

input)

CD:

107

dB

—15

dB

0.5

Vp—p/75S2

0.5

Vp—p/750)

Standard

TOSLINK

Tape

32,44.1,

48

kHz

2-20,000

Hz+0.2

dB

0.0015%

at

1

kHz

110

dB

103

dB

2V

1.m.S.

European

models

(except

U.K.):

USA

&

Canadian

AC220

V,

50

Hz

models:

AC120

V,

60

Hz

UK.

&

Australian

models:

AC240

V,

50

Hz

Worldwide

models:

120

and

220V

switchable,

50/60

Hz

435

(W)x

164

(H)

392

(D)

mm

17-1/8"

x

6-7/16"

x

15-7/16"

14.5

kg,

32.0

Ibs.

Specifications

and

features

are

subject

to

change

without

notice.

For

continued

protection

against

risk

fire,

replace

only

with

same

type

and

same

rating

fuse.

CIRCUIT

NO.

PART

NO.

F921

252052

F922

252077

or

252077CC

DESCRIPTION

7A

ST-6,

Primary

fuse

(120V,

120V/220V

model)

4A-SE-EAK

Primary

fuse

(220V,

240V,

120V/220V

model)

4A-SE-EAK

Primary

fuse

(220V,

240V,

120V/220V

model)

2.

Insulation

resistance

mesurement

(Only

U.S.A.

model)

Connect

the

insulating-resistance

tester

between

the

plug

of

power

supply

cable

and

the

terminal

GND

on

the

back

panel.

Specifications:

More

than

10

MQ

at

500V.

3.

Voltage

Selector

(Rear

Panel)

Worldwide

models

are

equipped

with

a

voltae

selector

to

conform

with

local

power

supplies.

Be

sure

to

set

this

switch

to

match

the

voltage

of

the

power

supply

in

your

area

before

turning

the

power

switch

on.

Voltage

is

changed

by

sliding

the

groove

in

the

switch

with

a

screwdriver

to

the

right

or

left.

Confirm

that

the

switch

has

been

moved

all

the

way

to

the

right

or

left

before

turning

the

power

switch

on.

Models

without

a

voltage

selector

can

only

be

used

in

areas

where

the

power

supply

is

the

same

as

that

of

the

unit.

220V

™

120V

™\

at

AC

120

V

220V

™

120V

at

AC

220

V

A-8800

ADJUSTMENT

PROCEDURES

Adjustments

and

Checking

the

Protection

Circuitry

1.

Preparations

1)

Place

the

unit

on

the

workbench.

(There

should

be

about

15

mm

of

space

between

the

base

plate

of

the

unit

and

the

work

surface.)

2)

Set

up

the

unit

as

follows.

(1)

No

load

(2)

No

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

be

OFF.

(2)

The

interior

of

the

unit

should

not

be

warm.

(3)

The

DAC

circuit

board

should

be

mounted

correctly.

2.

Idling

current

adjustment

1)

Turn

the

power

switch

ON

and

allow

the

unit

to

warm

up

for

about

10

minutes.

(1)

Adjust

R531

(R532)

so

that

the

voltage

at

test

point

VCT-IID

on

the

NAAF-3114

circuit

board

is

l5mV+5mV.

3.

Check

of

operation

of

protection

circuitry

1)

Check

of

operation

of

protection

relay

(1)

Confirm

that

the

relay

turns

ON

approximately

5

seconds

after

the

power

switch

is

turned

ON.

(2)

The

SOURCE

DIRECT

indicator

LED

should

light

at

the

same

time.

(3)

The

relay

should

turn

OFF

approximately

0.5

seconds

after

the

power

switch

is

turned

OFF.

2)

Check

of

DC

detection

and

servo

circuitry

operation

(1)

Turn

the

power

on

with

no

load.

(2)

After

the

speaker

relay

turns

ON,

apply

DC+200mV

to

the

LINE

input

terminals.

Confirm

that

the

relay

turns

OFF.

(3)

Confirm

that

operation

is

the

same

as

(2)

above

when

an

input

of

DC—200mV

is

applied.

Note)

Under

no

circumstances

connect

a

load

or

short

the

speaker

terminals

when

performing

the

above

test.

3)

Signal

input

from

the

circuit

illustrated

below

with

no

load.

(1)

Confirm

that

the

speaker

relay

does

not

turn

OFF

even

when

a

2

ohm

load

is

connected

when

a

peak

value

of

35V

p-p

1s

output.

(2)

Next,

confirm

that

when

a

1

ohm

load

is

connected

the

speaker

relay

switchse

OFF

and

ON

a

couple

of

times

and

then

stays

OFF.

Note)

The

period

before

that

relay

stays

OFF

should

not

last

for

more

than

1

minute.

Relay

OFF

status

can

be

canceled

by

switching

the

power

OFF.

Low-frequency

oscillator

A-8800

SP

Load

OUT

ae

Differe-

Attenua-

ntiator

tor

Square

wave

The

unit’s

volume

50Hz,

l1OVY

p-p

control

may

also

be

used.

Oscillo~

scope

3.8

KQ

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3.3

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Square

wave

input

from

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10

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Hz,

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resistors

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4.

DAC

block

adjustment

1)

Confirmation

of

fs

display

(1)

Input

a

digital

signal

to

one

of

the

DIGITAL

input

terminals

(1-3).

(2)

The

indicator

LED

should

light

as

follows

according

to

the

sampling

frequency

of

the

input

signal.

A

eV

A

orange

a

Od

os

VA

green

ld

be

esse

ner

ere

red

2)

Distortion

adjustment

(1)

Preparations

@

Connect

the

digital

output

terminal

of

a

suitable

equipped

CD

player

to

the

DIGITAL

1

digital

input

terminal

of

the

A-8800.

M

Connect

a

distortion

meter

to

the

analog

output

of

circuit

board

NADC-3386

or

to

the

unit’s

analog

REC

OUT

terminal.

@

Input

the

distortion

meter

signal

output

and

the

distortion

output

to

dual-phenomenon

oscilloscope.

(2)

Turn

power

ON

to

the

unit.

(3)

Play

track

2

of

the

test

disc

(YEDS-18).

(4)

Adjusting

the

4th

bit.

Adjust

semi-fixed

resistor

R815

(R-816)

so

that

the

non-continuous

portion

(difference

in

level)

of

the

distortion

elements

shown

at

right

is

as

small

as

possible.

Distortion

elements

Signal

—___

Representative

un-adjusted

waveform

V7

The

place

to

watch

when

adjusting

the

4th

bit

(5)

Adjusting

the

3rd

bit.

As

with

(3)

above,

adjust

semi-fixed

resistor

R813

(R814)

so

that

the

non-continuous

portion

(difference

in

level)

of

the

distortion

elements

is

as

small

as

possible.

4

The

place

to

watch

when

adjusting

the

3rd

bit

(6)

Adjusting

the

2nd

bit.

As

above,

adjust

semi-fixed

resistor

R811

(R812)

so

that

the

non-continuous

portion

(difference

in

level)

of

the

distortion

elements

is

as

small

as

possible.

Note)

It

does

not

matter

is

up

to

this

point

the

level

of

overall

distortion

is

high.

\/

The

place

to

watch

when

adjusting

the

2nd

bit

A-8800

Adjust

semi-fixed

resister

R809

(R810)

so

that

the

non-continuous

portion

of

the

final

remaining

distortion

waveform

(7)

Adjusting

the

2nd

bit.

is

as

small

as

possible.

\

1st

bit

adjustment

(8)

Repeat

steps

(4)

—

(7)

above

to

fine

adjust

to

optimum

settings.

Note)

The

distortion

meter

must

be

accurate

to

0.001%

or

better

and

possess

a

distortion

output

terminal.

FRONT

PANEL

FACILITIES

E} 19

[12

14

iE)

16

7]

1.

Power

switch

(POWER)

10.

Headphone

jack

(PHONES)

2.

Operation

indicator

(DIRECT/TONE/PROCESSOR)

11.

Contrabass

control

(CONTRABASS)

3.

Muting

switch

(MUTING)

12.

Bass

control

(BASS)

4.

Mode

selector

switch

(MODE)

13.

Treble

control

(TREBLE)

STEREO,

MONO

14.

Balance

control

(BALANCE)

5.

Volume

control

(VOLUME)

15.

Source

direct

switch

(SOURCE

DIRECT)

6.

Cartridge

selector

switch

(CARTRIDGE)

TONE,

DIRECT,

PROCESSOR

&

TONE

MC,

MM

16.

Video

mode

switch

(VIDEO

MODE)

7.

Input

selector

buttons

and

Indicators

(INPUT

VCR

REC::-CDV,

OFF,

VDP/VCR

SELECTOR)

VDP/VCR,

VDP,

CDV---BGV

DIGITAL

1,

DIGITAL

2

(DAT),

DIGITAL

3

17.

Recording

source

selector

switch

(REC

SELECTOR)

PHONO,

TUNER,

VCR,

VDP,

TAPE,

DAT,

CD

TAPE

®

DAT,

DAT

®

TAPE,

TUNER,

OFF,

8.

Digital

lock

indicator

(DIGITAL

LOCK)

SOURCE

9.

Speaker

selector

switch

(SPEAKERS)

OFF,

A,

B,

A+B

—~5—

A-8800

PCM58P

(D/A

converter)

TORX175

(Optical

receiver)

VTH

filter

|I5,

Nc

Clock

input

[16]

+Vcc

Optical

fiber

~Vecc

—Vec

Standard

voltage

NC

8]

Analog

common

generator

NC

RF

NC

'6|Currount

out

put

BIT

4

ADu

24

|5|Bipolar

offset

BIT

3

ADJs

[4]

BPO

filter

BIT

2

ADJ

'3]}Reference

filter

BIT

|

ADu

/2|+Vec

V

POT

11

|Seruo

filter

SYSTEM

CONNECTIONS

VIDEO

DISC

MONITOR

TV

VIBEO

PLAYER

CASSETTE

RECORDER

OUTPUT

Vv

INPUT

OUTPUT

VA

DIGITAL

ANALOG

REC

PLAY

REC

PLAY

R

DIGITAL

AUDIO

UNIT

with

Coaxial

USA

&

Canadi

del

i

anadian

models

on

Digital

Output

Worldwide

models

only

A

R

.

Sx

DIGITAL

GUTPUT

|

4C

OUTLETS

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aC120¥

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TTT

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7

VOLIAGE

SELECTOR

ON

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4

OPTICAL

DIGITAL

OUTPUT

DIGITAL

AUDIO

UNIT

with

Optical

Digital

Output

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not

necessary

far

turntable

without

ground

lead

to

SPEAKER

(B)

L}R

Audio

processors

SPEAKER

IMPEDANCE

OUTPUT

REC

PLAY

INPUT

OUTPUT

|

cuch

as

a

graphic

AorB:

4

ohms

MIN

+

equalizer

can

be

A

and

8:

&

ohms

MiN

connected

CASSETTE

AUDIO

TUNER

TAPE

DECK

PROCESSOR

AMPLIFIER

L

SPEAKER

(A)

Onkyo A-8800 User manual

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