Teac A-880 User manual

TEAC.

SERVICE

MANUAL

A-880

DC

Integrated

Stereo

Amplifier

A-880

|

SPECIFICATIONS

Output

Power:

50

watts

+

50

watts

*!

min.

RMS,

at

Intermodulation

Distor-

8

ohms

from

40

Hz

to

20

kHz,

with

no

tion:

0.2%

(At

-3

dB

power

output,

8

ohms,

more

than

0.5%

total

harmonic

distortion.

;

1

kHz)

80

W

+

80

W

(Dynamic

Power)

Signal-to-Noise

Ratio:

.

PHONO:

72

dB

55

W

+

55

W

(Both

channels,

8

ohms,

(IHF

A

Network)

TUNER,

CD,

AUX:

90

dB

40

Hz—20

kHz,

0.5%

THD)

TAPE PLAY

1,2:

90dB

Input

Sensitivity/

Power

Requirements:

110

—

120/200

—

220/230—

240

V

Impedance:

PHONO:

3

mV/47

k

ohms

AC,

50/60

Hz,

270

W

(General

export

TUNER,

CD,

AUX:

190

mV/42

k

ohms

model)

TAPE PLAY

1,2:

190

mV/42

k

ohms

120

V

AC,

60

Hz

180

W

(U.S.A./Canada)

Output

Voltage/

220

V

AC,

50

Hz

270

W

(Europe)

Impedance:

TAPE

REC

OUT:

180

mV/1k

ohms

240

V

AC,

50

Hz

270

W

(Australia)

Damping

Factor:

more

than

15

Dimensions

Frequency

Response:

PHONO

(RIAA):

30

Hz-

15

kHz

(Wx

H

x

D):

435

x

110

x

292

mm

+0.4

dB

(17-1/8"

x

4-5/16"

x

11-1/2")

TUNER,

CD,

AUX:

20

Hz—40

kHz

*?

dB

Weight:

6.5

kg

(14-5/16

Ibs.)

net

TAPE PLAY

1,2:

20

Hz—40

kHz

*3

dB

Graphic

Equalizer:

Number

of

Bands:

5

Center

Frequency:

63,

250,

1k,

4k,

*!

Measured

pursuant

to

the

Federal

Trade

Commission's

Trade

“16k

Hz

Regulation

Rule

on

Power

Output

Claims

for

Amplifier.

Boost/Cut

Range:

+8

dB

*

Improvements

may

result

in

specification

or

feature

changes

Total

Harmonic

Distor-

without

notice.

tion:

0.09%

(At

~3

dB

power

output,

8

ohms,

1

kHz}

CAUTION

A

Parts

marked

with

this

sign

are

safety

critical

components.

They

must

always

be

replaced

with

identical

components

—

refer

to

the

appropriate

parts

list

and

ensure

exact

replace-

ment.

SERVICE

POINT

e

As

this

unit

uses

a

large

capacity

power

supply,

e

Parts

installation

method

be

careful

of

the

following

points

when

check-

Great

care

is

taken

in

installing

parts

to

improve

the

ing

and

repairing.

safety

of

products.

For

example,

parts

are

covered

(1)

To

check

and

repair

the

printed

wiring

boards,

be

with

tubes,

or

they

are

kept

away

from

the

printed

sure

to

cut

off

the

power

and

pull

out

the

power

wiring

board

surface.

Be

sure

to

maintain

the

cord.

Remove

the

bottom

plate

and

discharge

the

after

replacing

parts

for

repair.

power

capacitors

by

touching

it

with

a

resistor

of

approx.

10

ohms,

5

watts

capacity

at

the

positions

C807

and

C808.

(2)

This

amplifier

employs

a

heat

sink

and

so

when

conducting

a

continuity

check,

the

unit

should

be

placed

horizontally

or

stood

on

its

transformer

end.

CIRCUIT

BOARD

CHECKING

AND

ESCUTCHEON

ASS’Y

DISASSEMBLY

PROCEDURES

Screw,

bind

head

4x10

(x4)

Screw,

bind

head

3ox8

(x4)

-

“Screw,

bind

head

3ox8

(x4)

Screw,

bind

head

36x12

(x6)

Screw,

tapping

bind

head

3¢x10

(x7)

@

Set

the

body

upright

to

the

arrow

direction.

‘8-880

CHECKING

THE

OPERATION

OF

THE

PROTECTION

CIRCUIT

aS00

00

0000

00

AC

voltmeter

Oscilloscope

OUTPUT

Audio

oscillator

When

the

output

circuit

is

repaired

by

replacing

the

output

transistors,

etc.,

perform

an

operation

check

on

the

ASO

(Area

of

Safe

Operation)

detection

circuit

for

the

output

transistors

and

the

speaker

protection

circuit.

1.

Operation

check

of

the

ASO

detection

circuit

for

the

output

transistors

Connect

the

audio

oscillator

to

the

TUNER

IN

ter-

minals

with

the

speaker

terminals

unloaded

(speaker.

disconnect).

Set

the

frequency

of

the

audio

oscillator

at

1

kHz

and

adjust

the

level

of

the

input

signal

so

that

the

voltage

at

the

speaker

terminals

is

approx.

5

Vrms.

Under

these

conditions,

short-circuit

the

speaker

ter-

minals

of

the

channel

to

which

the

input

signal

is

ap-

plied

using

a

lead

wire,

etc.

If

this

short-circuit

makes

the

ASO

detection

circuit

operate,

no

output

appears

at

the

speaker

terminals

even

if

the

lead wire

used

for

short-circuiting

is

removed.

Next,

turn

off

the

power

switch

and,

after

approx.

10

sec.,

turn

the

power

switch

on

again.

When

output

comes

out

of

the

speaker

terminals,

this

indicates

that

the

ASO

detection

circuit

is

operating

normally.

2.

Operation

check

of

the

speaker

protection

cir

cuit

Make

sure

that

the

relay

operates

(a

click

sound

is

heard)

approx.

7

-

10

seconds

after

the

power

switch

is

turned

on

with

the

speaker

terminals

unloaded

(speaker:

disconnect).

Next,

when

a

resistor

with

a

resistance

of

approximately

10

k

ohms

and

two

1.5

V

dry

batteries

are

connected

in

series

across

pins

5

and

2

of

main

power

printed

wiring

board

1C901,

the

relay

turns

off

within

1

sec.

Next,

when

power

is

turned

on

again

after

at

least

10

seconds

have

passed,

the

relay

takes

7

—

10

seconds

to

start

activating.

Next,

change

the

polarities

of

the

dry

bat-

teries

and

carry

out

the

above

mentioned

operation

to

check

the

operation

of

the

relay.

If

the

relay

is

energized

with

this

operation,

it

means

that

the

speaker

protection

circuits

are

functioning

normally.

When

conducting

this

operational

check,

take

care

not

to

create

shortcircuits

with

parts

close

at

hand.

©

Phenomena

and

remedy

when

the

protection

circuit

operates

?

er:

Phenomenon

when

the

protection

fal

Type

of

protection

circuit

operates

Cause

a

—

1

|

Muting

circuit

No

sound

comes

out

about

7

—

10

sec.

after

the

power

switch

is

turned

ON.

Protection

circuit

of

the

.

No

sound

comes

out.

output

transistors

.

When

the

power

switch

is

turned

ON,

the

relay

becomes

ON,

then

OFF

when

the

signal

is

applied.

Speaker

protection

circuit

.

No

sound

comes

out.

(DC

voltage

detec-

.

Neutral

point

voltage

is

more

tion/protection

circult)

than

+2

V.

.

After

the

power

switch

is

Oh

ON,

relay

doesn’t

turn

N.

Short

circuit

of

speaker

|

Turn

off

the

power

switch,

check

output

terminal.

whether

the

speaker

terminal

is

shor!

circuited

or

not,

and

turn

ON

again.

Power

amplifier

faulty,

Repair

faulty

parts

in

power

amplifier

.

etc.

A-880

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EUR

470P

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[|

——

[

——

[

C704L,R

|

C713L,R

C807

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P40BL,R|

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|

+—

|

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7K

|

100P

Cé624L,R

|

——

|

C710L,R

C714.

R

R401L,R|

4—

|

€—

.

[-100P

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|

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C711L,R

CTI5L,R

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10

50H2

~240V

|

T1.64

~220V

|

71.64

RE

RETE

|

Il

7

ae

a

|

A

|

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|

aczaov

Seas

220V

120V

for

EX

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50Hz

AC240V

AC220V

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ee

SE

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Se

TEAC.

Effective:

October,

1985

PARTS

LIST

A-880

DC

Integrated

Stereo

Amplifier

CAUTION

A

Parts

marked

with

this

sign

are

safety

critical

components.

They

must

always

be

replaced

with

identical

components-refer

to

the

appropriate

parts

Jist

and

ensure

exact

replacement.

570402100

A-880

|

PARTS

LOCATION-1

12

9,1f

10,13

8

10,13

_

*5761183800

*5761169100

5761163200

5761154400

5761163100

5761154300

5761154500

5761163300

*5760757500

*5760732100

*5761160000

*5761160400

*5761160200

00068400

#3307027000

FUSE,

2.

sto150

Sa

le

*5760745

500

ADAPTER,

SOCKET

({US]:U.S.A.

[C]:CANADA

[E]:EUROPE

[A]:AUSTRALIA

[GE]

:GENERAL

EXPORT

Parts

marked

with

*require

longer

delivery

tine.

Teac A-880 User manual

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