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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|

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EUR

470P

[_ca22

[|

——

[

——

[

C704L,R

|

C713L,R

C807

=o

P40BL,R|

#—

|

+—

|

Jumper)

7K

|

100P

Cé624L,R

|

——

|

C710L,R

C714.

R

R401L,R|

4—

|

€—

.

[-100P

C7oiL

|

<—

I

i

C711L,R

CTI5L,R

[R406L,R

|

@—

|

@—

|

Jumper

10

50H2

~240V

|

T1.64

~220V

|

71.64

RE

RETE

|

Il

7

ae

a

|

A

|

‘TTL

|

aczaov

Seas

220V

120V

for

EX

50/60Hz

50Hz

AC240V

AC220V

Wes

ee

SE

ee

Rs

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.

PARTS

LOCATION-2

2-1

*5

761184400

*5761184100

*5761184200

*5761184300

4*5760733600

4\*5761180100

4\*53

50008300

4\*5350008200

4

5760747600

4*5761179800

*5

760757000

4

5142188000

*5760732800

3

OAD,

AC

[US

CORD

AC

Al

3

SW.

,

VOLTACE

Ac

QUILET

[

HOLDER

,

FUSE

FUSE,

1264-2

SCREW

*5760732900

WASHER

*5761183900

CHASSIS

sC]

E,GE]

SELECTOR

[GE]

C,CE]

>

[GE

50V

by

[GE]

2-12

2-13

2-14

2-15

2-16

2-17

2-18

*5761168700

*5761179500

*5761179600

*5761179700

A

5761168600

A

5761179200

A

5761179300

4

5761179400

*5761182800

PLATE

*5761183600

*5761185300

*5761184700

*5760735200

*5761184600

*5761160300

[US]:U.S.A.

[C]:CANADA

[E]:EUROPE

[A]

:AUSTRALIA

[GE]

:GENERAL

EXPORT

Parts

marked

with

*require

longer

delivery

tim.

A-880

|

PARTS

LOCATION-3

|

dks

GOOOGOOO

*5760737700

SCREW,BIND

DI

3X10

*5760734900

SCREW,

BIND

DT

3x8

*5761168700

*5761179500

*5761179600

*5761179700

*5761183000

AD

PWB

*5760750100

*5760750300

PLUG,MINI

H

*5761179900

*5761180000

JACK

,HEAD!

*5761152000

*5761180200

*5761180300

*5761180400

*5761180500

*5761180600

*5761180800

*5761158700

*5761181000

*5761183700

HO

*5761185100

*5761185200

*5761172800

*5760737700

*5761160000

*5761160500

5760749700

5761175800

5761176200

5761175800

5761143100

5761176900

5761177000

CQ92M1H822JEBK

5761144000

5761143300

5761144000

5761179000

5761142800

5761175800

5761144100

5761144500

5761177200

5761175900

5761175800

5761144100

5761143300

5761176300

5760751000

5761142500

5761144800

5761144900

0Q9

9761142400

5761144800

8

P

US

JAK

CONNECTOR

XH

3-100

L=100

CONNECTOR;

XH

3-250

L=250

CONNECTOR

>

XH

400

L=400

CONNECTOR;

XH

11-130

L=130

CONNECTOR

,

°XH

3-200

L=200

XH

iE,

A,

WEI

eR

FIN,

RADIATION(T)

FIN,

RADIATION

L=60

C711

L/R

C712

L/R

C.,CERAMIC

0.O1UF

(P)

CCL4SLIH1OLJBK

CK14B1H471KBK

ee

CC14SL1H101JBK

CEO4WOJLOIMBK

0Q92M1H222JEBK

CEO4W1HOLOMBK

CEO4W1C100MBK

CEO4W1LCLOOMBK

CEG4W1HOLOMBK

CEO4W1HO1OMBK

CEO4W1C22

2MBK

CK14Y1C223NB

CCI4SLIHLOLJBK

[E]

CQ92M1H103KEBK

CQ92M1H273KERK

[E]

CKIGBIH151KBK

5761177100

CQ92M1H333KEBK

CC14SL1HLOLJBK

CEOAWLH3R3MBK

CEO4WLCLOOMBK

CK14B1H561KBK

SW.

,

PUSH

CK14X1C0392NBO50

5761145000

5761144700

5761145100

5761144000

5761143500

5761143100

|

A-880

5761143500

CEO4W1C470MBK

5761176400

5761176100

5761178900

5761175700

5761176200

5761176300

5761144100

CE

5761143100

CE

5761175800

5761178800

5761179100

5761144000

5761144600

5761142800

576114450!

5761176700

5761144500

LTR

5761178200

5761175600

5761175800

7800

45760749600

5761147800

5761143100

576114400

5761142800

5761176600

5761143100

5761144000

5761176600

2760751000

0

ee

O4WOJ1LOIMBK

CC14SL1H101.JBK

CC45SL1H271JF

CEO4WLH1LOIMFK

CEO4W1HOLOMBK

aes

Cea

ICSIaNB

SaNB

ee

E]}

ie]

cae

E

CQ92M1H102KEBK

;

CQO2MIHLO3KE_

—s«{E

CC14SLIH3R3KBK

CC14SL1H101JBK

CEOAWLE4

7

0MBK

CEO4W1HLOOMBK

0

CE

O4W1H682M

C.,CERAMIC

0.O1UF

(Z)

CQ9ZM2ALO4KEF

[E]

CEO4WOJLOIMBK

Q

CEO4W1HOLOMBK

CK14Y1C223NB

CEO4W1LHAR

7MBK

5761176600

CE

5761176500

50425

5000!

CEO4WIHORIMBK

O

DIODE,1S2473

.

5761162000

GL-5PR6

50425

50000

5224012510

50425

5000

5760765300

604835

5000

5761162000

[US]:U.S.A.

[C]:CANADA

[E]:EUROPE

[A]

:AUSTRALIA

[GE]

:GENERAL

EXPORT

.

Parts

marked

with

*require

longer

delivery

time.

DIODE,

1S2473

DIODE

,1S2076

FA

FF

0

DIODE,

3182473

DIODE

*ERB12—O1R-TPT

DIODE,

STACK.4A

S4VB20

GL-5PR6,

L701

Q601

L/R

2

L/R

Sor

t/t

oe

1¢90

1¢902

L/R

5761162300

L/R

576074950

5761162000

5761162100

GL-SNG6

2550000

DIODE,

182473

5760765200

DIODE,

5761180900

5761162500

5760748200

5761150200

5761162600

5760765000

5760

5761161700

5197326000

5231755100

5230505700

5761139400

5761139300

576113930

5761139300

5761173200

5761174100

5761174900

5761174600

5761139300

45761147100

5761174200

5761173600

5761139500

5761139600

5761177700

5761173900

-

5761177800

DIODE,

7182473

DIODE,

3182473

>

1K34A~TPT

FUSE,3A

125V

TSC

(us]

FUSE,

1.6A,

at

{E,

1C,M5218P

Tc:

Toe

IC,

1C9151P

MONO

Is.

STK191

(2)

insepe

COIL,AUDIO

TRAP

TR

28C1740LN-E

765000

TR

2SC1740LN-E

SI.TR,

2SCL7

75A/E

SI.TR.2SA-844

SI.TR.

2SD880-Y

SI.TR.

2SB834-Y

RDJAS2E152JB

RD14S2E332JB

[E

RD14S2E

102JB

RD14S2E102JB

0

RD14S2E102JB

RD14S2E681JB

RD14S2E333JB

RD14S2E394JB

RD14S2E104JB

RD14S2E102JB

oe

RD14B2E101JF-FR

RD14S2E393JB

RD14S2E182JB

RD14S2E1823B

RD14S2E2225B

RV16041H2040WM25K

RD14S2E183JB

RV16342A204EM25K

5761174600

5761173400

5761174700

576113960

5761174600

5761139600

5761139800

5761173600

5761139900

5761174000

5761174300

5761139600

5761139800

5761173600

5761139900

5761174000

5761174300

L/

R623

R624

5761177900

R625

R626

5761177900

5761174800

5761139500

RD14S2E104JB

RD14S2E332JB

RD14S2E154JB

0

RDI4S2E2225B

RD14S2E104JB

RD14S2E222JB

RD14S2E562JB

RD14S2E682JB

RD14S2E103JB

RD14S2E22335B

RD14S2E473JB

RD14S2E222JB

RD14S2E562JB

RD14S2E682JB

RD14S2E103JB

RD14S2E223JB

RD14S2E473JB

RD14S2F473JB

VOLUME

,

SLIDE

VOLUME,

SLIDE

VOLUME

,

SLIDE

RD14S2E334JB

RD14S2E1825B

5761139300

RD14S2E102JB

45761178400

45761178500

5761173000

5761175000

5761174700

5761139300

RN14B2E121JF-FR

RN14B2E221

JF-FR

RD14S2E.560JB

RD14S2E824JB

RD14S2E154JB

RD14S2E102JB

5761174600

RD14S2E104JB

5761173200

RD14S2£681JB

5761174600

RD14S2E104JB

R

45761147100

5761178700

5761139600

5761173300

5761139900

5761174600

5761172900

5761174000

5761175

00

5761175500:

5761178600

5761175100

5761139600

5761139300

5761147200

5761173900

5761175400

RD14B2E101JF-FR

RNI4B3DR22KF

RD14S2E222JB

RD14S2E272JB

RD14S2E103JB

RD14S2E104JB

RD14S2E100JB

RN14B3AL00KF

RCOSGF2H181KB

RD14S2E222JB

RWC14S3H820KT

RD14S2E1025B

RD14S2E102JB

»

RSO8B3A181KEF

RD14S2E183JB

RCO5GF2E122KB

300

RD14S2E272JB

5761173

5761173700

(US]:U.S.A.

[C]:CANADA

[E]:EUROPE

[A]

:AUSTRALIA

[GE]

:GENERAL

EXPORT

Parts

marked

with

“require

longer

delivery

tim.

RD14S2E822JB

|

A-880

5761174000

5761174500

5761174400

5761173800

RD14S2E1535B

5761175200

RCOSGF2H471KB

9761175300

RCOSGF2H561KB

5761173300

RD14S2E2725B

5761173900

RD14S2E183JB

5761174600

RD14S2E104JB

5761173800

RD14S2E153JB

5761173500

RD14S2E392JB

5761173300

RD14S2E272J3B

5761174200

RD14S2E393JB

5761173100

RD14S2E391J5B

5761139100

RD14S2E2215B

5761139100

RD14S2E221JB

5761163000

RELAY,DH

5760763900

Sw.

,PUSH

S401

S402

5760743300

SW.

>TACT

S403 S404

5760743300

SW.

TACT

S405

S406

5760743300

SW.

,

TACT

5761162900

SW.:PUSH

1

KEY

SUN

5761162800

SW.,PUSH

1

KEY

5761162700

SW..PUSH

1

KEY

5761184000

BRACKET,GND

5760749000

DIODE

,HZ-7C-3

5761161900

HZ11A2—TPT

5224543801

DIODE,ZENER

RDL5EB3

FR

5224543801

DIODE;ZENER

RD1SEB3

FR

5760765800

DIODE,

ZENER

HZ-12C-2

TPT

Teac A-880 User manual

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