Teac A-880 Bedienungsanleitung

TEAC.

SERVICE

MANUAL

A-880

Integrated

Stereo

Amplifier

A-880

SPECIFICATIONS

Output

Power:

watts

min.

RMS,

Intermodulation

Distor-

ohms

from

kHz,

with

tion:

0.2%

(At

-3

power

output,

ohms,

than

0.5%

total

harmonic

distortion.

;

kHz)

(Dynamic

Power)

Signal-to-Noise

Ratio:

PHONO:

(Both

channels,

ohms,

(IHF

Network)

TUNER,

CD,

AUX:

Hz—20

kHz,

0.5%

THD)

TAPE PLAY

1,2:

90dB

Input

Sensitivity/

Power

Requirements:

110

—

120/200

—

220/230—

240

Impedance:

PHONO:

mV/47

ohms

AC,

50/60

Hz,

270

(General

export

TUNER,

CD,

AUX:

190

mV/42

ohms

model)

TAPE PLAY

1,2:

190

mV/42

ohms

120

AC,

180

(U.S.A./Canada)

Output

Voltage/

220

AC,

270

(Europe)

Impedance:

TAPE

REC

OUT:

180

mV/1k

ohms

240

AC,

270

(Australia)

Damping

Factor:

than

Dimensions

Frequency

Response:

PHONO

(RIAA):

Hz-

kHz

(Wx

D):

435

110

292

+0.4

(17-1/8"

4-5/16"

11-1/2")

TUNER,

CD,

AUX:

Hz—40

kHz

Weight:

6.5

(14-5/16

Ibs.)

net

TAPE PLAY

1,2:

Hz—40

kHz

Graphic

Equalizer:

Number

Bands:

Center

Frequency:

63,

250,

1k,

4k,

Measured

pursuant

the

Federal

Trade

Commission's

Trade

“16k

Regulation

Rule

Power

Output

Claims

for

Amplifier.

Boost/Cut

Range:

Improvements

may

result

specification

feature

changes

Total

Harmonic

Distor-

without

notice.

tion:

0.09%

(At

power

output,

ohms,

kHz}

CAUTION

Parts

marked

with

this

sign

are

safety

critical

components.

They

must

always

replaced

with

identical

components

—

refer

the

appropriate

parts

list

and

ensure

exact

replace-

ment.

SERVICE

POINT

this

unit

uses

large

capacity

power

supply,

Parts

installation

method

careful

the

following

points

when

check-

Great

care

taken

installing

parts

improve

the

ing

and

repairing.

safety

products.

For

example,

parts

are

covered

(1)

check

and

repair

the

printed

wiring

boards,

with

tubes,

they

are

kept

away

from

the

printed

sure

cut

off

the

power

and

pull

out

the

power

wiring

board

surface.

sure

maintain

the

cord.

Remove

the

bottom

plate

and

discharge

the

conditions

after

replacing

parts

for

repair.

power

capacitors

touching

with

resistor

approx.

ohms,

watts

capacity

the

positions

C807

and

C808.

(2)

This

amplifier

employs

heat

sink

and

when

conducting

continuity

check,

the

unit

should

placed

horizontally

stood

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

the

arrow

direction.

‘8-880

CHECKING

THE

OPERATION

THE

PROTECTION

CIRCUIT

aS00

0000

voltmeter

Oscilloscope

OUTPUT

Audio

oscillator

When

the

output

circuit

repaired

replacing

the

output

transistors,

etc.,

perform

operation

check

the

ASO

(Area

Safe

Operation)

detection

circuit

for

the

output

transistors

and

the

speaker

protection

circuit.

Operation

check

the

ASO

detection

circuit

for

the

output

transistors

Connect

the

audio

oscillator

the

TUNER

ter-

minals

with

the

speaker

terminals

unloaded

(speaker.

disconnect).

Set

the

frequency

the

audio

oscillator

kHz

and

adjust

the

level

the

input

signal

that

the

voltage

the

speaker

terminals

approx.

Vrms.

Under

these

conditions,

short-circuit

the

speaker

ter-

minals

the

channel

which

the

input

signal

ap-

plied

using

lead

wire,

etc.

this

short-circuit

makes

the

ASO

detection

circuit

operate,

output

appears

the

speaker

terminals

even

the

lead wire

used

for

short-circuiting

removed.

Next,

turn

off

the

power

switch

and,

after

approx.

sec.,

turn

the

power

switch

again.

When

output

comes

out

the

speaker

terminals,

this

indicates

that

the

ASO

detection

circuit

operating

normally.

Operation

check

the

speaker

protection

cir

cuit

Make

sure

that

the

relay

operates

click

sound

heard)

approx.

seconds

after

the

power

switch

turned

with

the

speaker

terminals

unloaded

(speaker:

disconnect).

Next,

when

resistor

with

resistance

approximately

ohms

and

two

1.5

dry

batteries

are

connected

series

across

pins

and

main

power

printed

wiring

board

1C901,

the

relay

turns

off

within

sec.

Next,

when

power

turned

again

after

least

seconds

have

passed,

the

relay

takes

—

seconds

start

activating.

Next,

change

the

polarities

the

dry

bat-

teries

and

carry

out

the

above

mentioned

operation

check

the

operation

the

relay.

the

relay

energized

with

this

operation,

means

that

the

speaker

protection

circuits

are

functioning

normally.

When

conducting

this

operational

check,

take

care

not

create

shortcircuits

with

parts

hand.

Phenomena

and

remedy

when

the

protection

circuit

operates

er:

Phenomenon

when

the

protection

fal

Type

protection

circuit

operates

Cause

—

Muting

circuit

sound

comes

out

about

—

sec.

after

the

power

switch

turned

ON.

Protection

circuit

the

sound

comes

out.

output

transistors

When

the

power

switch

turned

ON,

the

relay

becomes

ON,

then

OFF

when

the

signal

applied.

Speaker

protection

circuit

sound

comes

out.

(DC

voltage

detec-

Neutral

point

voltage

tion/protection

circult)

than

After

the

power

switch

ON,

relay

doesn’t

turn

Short

circuit

speaker

Turn

off

the

power

switch,

check

output

terminal.

whether

the

speaker

terminal

shor!

circuited

not,

and

turn

again.

Power

amplifier

faulty,

Repair

faulty

parts

power

amplifier

etc.

A-880

BLOCK

DIAGRAM

1LNO

¥O19313S

JOVLIOA

PEs

Laegenonannanans]

[S)

mee

1003

Soe

HOLIMS

HaMOd

+004

---

HO.LIMS

H3MOd

LOOd

Epo,

HOLIMS

HaMOd

SNVHL

H3MOd

LOOL

L00S

err

LOS

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hse

Sic

aes

OCR

acne

eee

Nees

eats

Fano

"vol

L37LNO

OV a-

TWNIWYAL

YanVv3ads

ZHO9

‘aVLS

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208D

HOLIMS

Y3NV3dS

{

Hanv3adS

HOLIMS

H3MOg

+004

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8VLS"LIOA

als

LOZDI

ogo

wove

HOLIMS

H3NV3dS

LOLS

3NOHd0V3H

Z0601

934

NOILO3LOUd

aniuamod

(@)

(&)

3408

adi

HOLIMS

¥OL9374S

NOILONN4

900S

LOVS

O43

adv

AWId

TOYLNOD

WNI0A

1041NO9

NIVW

JSONVIVa

v09u

cosy

TOYLNOS

¥3Z11VND3

129

€294

HOLIMS

dWV

H3MOd

dNVASVLIOA

ccanannot

‘12090

ONOHd

z0291

+0291

Logs

SNIHOLIMS

ONIHOLIMS

dWY

43ZI1VND3

£091

Z0vdi

ONOHd

Lovol

A-880

WIRING

DIAGRAM

401939138

ADVLIOA

FONVEO

”

' t

‘

1 x

‘GND

‘VOL

40};

(PERSP

Son

Serres

alee

Sere

sae

sso

‘

(

‘

'S3

'SZ

‘Sx

105

:AVHO

‘VS

40)

‘NMOMG

‘

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Vic

‘

gen

4041.

eee.

diane

pase

‘Md

SNOHdOVaH

31¢uNd

‘aMd

yaznvnda

IHG

‘a'Wd

AWN

IOA

L1H

x70

.@Wd

YOLVDIONI

037

A~880

PRINTED

WIRING

BOARD

Earth,

:Other]

GRAPHIC

EQUALIZER

P.W.B.

RETIN

“TTT

REIGR,

MAIN

P.W.B.

VIDEO/AUX

REC

SPEAKERS

TERMINAL

reteL

RENE

AGO:

BIS

; i

eases

Wie

ROI4L

ooonwow

ffi)

’

renal

owner

geen

SLED

LED

OLED’

LED’

“LED

. :

‘LED

«LED.

LED.

LED:

(ED

TED

LED

s03R

S04R

SOL

90BL.

«DSL

9O4L

OSL.

9O2L

«GOT

o—{|+-—«

resmoyg-,

COOTR

HEADPHONE

e4fe

ceo2i

LED

INDICATOR

P.W.B.

nae

CONTROL

BALANCE

CONTROL

1716

1514

121110

e@e®¢ee

\-446

Bei.

Aon:

s00t

che

—

POWER

SWITCH

ale

Fad

A3®@

A5@

1c402

isa

No.

ON/OFF

__$401

(ON)

S402

$403

(ON)

$404

(ON)

Fuse

Resistor)

PROS

(ON)

4(0

"$404(ON)

713.4)

77.

‘S405

(ON)

[13.4

13.4

[SMO6(ON)

113-470

SPEAKER

SWITCH

A-880

CIRCUIT

DIAGRAM

(Fuse

Resistor)

Zar

(Fuse

Resistor)

eae

R415

C420L

(8)

100

3.3/50

poe

LED9O1L

PHONO

EQUA

Agte

'c402

1¢403

LED9O2L

YRA0IL

LIZER

AMP

TC9152P

TC9151P_

182473

LeEDgo3L

aoa

rata

SWITCHING

bebedit:

13.7

ion

1c401

M5218}

Pe?

can

Ra0aL

47K

422

]

BALANCE

(3X4)

CONTROL

R602

200K-

cao7

Rch

(Special

Washer)

10/16

200K-(B)

412

22000P

caog

10/16

R403L

TUNER(Q)

R404L

IO.c10

=10

“|

D419

VIDEO/AUX

1c402

ic403

off

lob?

ose

oslo

182473

‘

< <

GRAPHIC

EQUALIZER

No.

Vad

gwen

5 e

npg!

$401

(ON)|

[11.5]

$401

(ON)

113.4]

ane

Semen

ee)

ae]

REIL

Re12L

R614

RO15L

ret

S402(ON)|

[115)

$402

(ON)

/13.4]

cae

D420

5.6K

8.8K

22K

47K

S403

(ON)|

[115

$403

(ON)

/13.4]

182473

s404(On)|11.5]|

S404

(ON)

13.4)

cei2b

C614L

C615L

Zo}

C624L

R405L

$405

(ON)

13.4/134

o§

0.012

0.068

asst

0421

ROO6L

Reso

S406

(ON)

[13.4]

182473

33k

PLAY

Thy

Sco

TAPE1

eRA0SL

LNIE)

c603L

REC

—-

ose

R627

100K-

R407L

C417L

100K

-(B)

)

Gelke(e)

PLAY

ROI7L

R61BL

R620L

RO21L

5.6K

6.8

22K

47K

oan

TAPE2

YeR408L

[

R63OL

REC

Re2ei

SREOSL

Bons

C419.

R421

100K

ZD601

18)

H27C3

Rch

(Same

Lch)

IC701

STK-4191T

—

ROIIL

-D9NIL

ROI2L

27K

1K34AF

39K

46.0

702

DSTO.

284872

Teale

SPEAKERS

Dos

D9O9L

ANA

R720

182473

isoa7g

C910L

TERMINAL

2.2K

0.1/50

Bas

$701

aria

SPEAKER

0.01

Leh

Rch

Gao

ante

HEADPHONE

ASWITCH

cS)

®@

(1/2)

1/2W)

JACK

R710L,

elo

Saal

C711R

10K

ESes

fen

7011

croak

cal

Lae

ett

Q701L

ajrs

2SC177BA(E)

poms]

46.0

RY701

yanony

¥5

pas

VOLT.

STAB,

8901

R7OBL

(ow)

Leo

[88

47K

R712L

Tse

R7O7L

SPEAKER

O22

(QW)

182076A

C2198.

R904

R711L

(2W)

470

100K

(/2W)

yee

R802

0.047

R905

CIRCUIT

uPC1237H

C801

20801

C708

560

PROTECTION

47/25)

HZ2153

1/50

(raw)

PATCH/AUTO

cea

NEUTRAL

|r]

RESET

{

eas

POINT

SELECTOR

D801

pais

100/50

POTENTIAL

ERB12-01

C802

©zD802

B53

0.01/250x24

.100/6.3

47/25

j {

R803

238

REOS

~S8

C707

ere

1/50

~30.4

560P

—46.2

LEDSOTL

C0,

i440

OGL

27K

1/50

R907!

B33

srs

Las

Tome

Tera

CSO6L

RO14L

ROIS

LED905L

LED9O7L

220°

220

‘

C909

47/50

figs

hg)

12.6

411.0

12.6

ALA

AA”

Rch

(Same

Lch)

Reh

(Same

Lch)

a8so2

R804

2SB834(Y)

470

(1W)

VOLT.

STAB.

TCA

Tca

TCA

EUR

[

NO.

cnp_|

AUS

”

NO.

AUS

[ex

cur

NO.

¥%

NO.

cnp

AUS

NO.

EUR

470P

[_ca22

——

[

——

[

C704L,R

C713L,R

C807

P40BL,R|

#—

+—

Jumper)

100P

Cé624L,R

——

C710L,R

C714.

R401L,R|

4—

€—

[-100P

C7oiL

<—

C711L,R

CTI5L,R

[R406L,R

@—

Jumper

50H2

~240V

T1.64

~220V

71.64

RETE

‘TTL

aczaov

Seas

220V

120V

for

50/60Hz

50Hz

AC240V

AC220V

Wes

TEAC.

Effective:

October,

1985

PARTS

LIST

A-880

Integrated

Stereo

Amplifier

CAUTION

Parts

marked

with

this

sign

are

safety

critical

components.

They

must

always

replaced

with

identical

components-refer

the

appropriate

parts

Jist

and

ensure

exact

replacement.

570402100

A-880

PARTS

LOCATION-1

9,1f

10,13

*5761183800

*5761169100

5761163200

5761154400

5761163100

5761154300

5761154500

5761163300

*5760757500

*5760732100

*5761160000

*5761160400

*5761160200

00068400

#3307027000

FUSE,

sto150

*5760745

500

ADAPTER,

SOCKET

({US]:U.S.A.

[C]:CANADA

[E]:EUROPE

[A]:AUSTRALIA

[GE]

:GENERAL

EXPORT

Parts

marked

with

*require

longer

delivery

tine.

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