Teac An-80 User manual

AN-SO

NOISE

REDUCTION

UNIT

SERVICE

MANUAL

at

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TEAC

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SALES

OFFICE:

SHINJUKU

BUILDING

MONTEBELLO,

CALIFORNIA

90640

1-8-1,

NISHI-SHINJUKU,

SHINJUKU,

TOKYO

U.S.A.

TEAC

HONGKONG

LIMITED

ROOM

NO.

1105

EUROPEAN

DISTRIBUTOR:

TEAC

EUROPE

B.V.

MAIN

OFFICE:

MELBOURNE

PLAZA,

33

QUEEN'S

ROAD

KABELWEG

45-47,

AMSTERDAM-W.

2,

CENTRAL,

HONG

KONG

HOLLAND

MA0800E300

Frequency

Response:

Increased

SN

Ratio:

Input

Sensitivity:

Input

Impedance:

Output

Level:

Maximum

Output

Voltage:

Output

Impedance:

Harmonic

Distortion

Factor:

Multiplex

Filter:

SN

Ratio:

Calibration

Oscillator:

Level

variation

Oscillation

Frequency:

Frequency

Response:

Record

Input

Sensitivity:

Input

Impedance:

Record

Output

Level

Maximum

Record

Output

Level:

Output

Impedance

Harmonic

Distortion

Factor:

Multiplex

Filter:

SN

Ratio:

SERVICE

DATA

30HZ2-13kHz

+2dB

10dB

or

better

at

10kHz

5dB

or

better

at

1lkHz

Overall

6dB

or

better

Line

input

30mV+2dB

35kQ

or

more

Line

output

580mV+2dB

2.3V

or

more

6k2

or

more

0.5%

or

less

19kHz

--35dB

or

less

-30dB

or

less

at

38kHz

60dB

or

better

+1dB

or

less

400H2+15%

10kHz:

+10dB+1dB

kHz:

5.5dB+1dB

30HzV15kHz+1.5dB

30mVti2dB

35kQ

or

more

580mV+2dB

2.3V

or

more

3kQ2

or

less

0.5%

or

less

-18dB

or

less

at

19kHz

-13dB

or

less

at

38kHz

60dB

or

better

OVERALL

ELECTRICAL

CHARACTERISTICS

—————————__________.

At

level

below

DOLBY

ref-

erence

level

"B"

weighted

measurement

Minimum

input

voltage

re-

quired

for

reference

level

Line

input

Load

resistance

50k

or

more

Load

‘resistance

50k2

or

more

At

monitor

terminal

reference

level

RECORD

MODE

CHARACTERISTICS

—————____________

At

reference

level

Minimum

input

voltage

re-

quired

for

reference

output

level

Load

resistance

50kQ2

or

more

Load

resistance

50k2

or

more

At

reference

level

Input

terminal

shorted

with

4,

7kQ

aa

4

BPS

Frequency

Response:

Playback

Input

Sensitivity:

Input

Impedance:

Playback

Output

Level:

Maximum

playback

output

Level:

Playback

Output

Impedance:

Harmonic

Distortion

Factor:

Multiplex

Filter:

SN

Ratio:

Power

Supply:

Power

Consumption:

AC

Outlet:

Overall

Dimensions:

Weight:

PLAYBACK

MODE

CHARACTERISTICS

10kHz:

-10dB+1dB

lkHz:

-5.5dB+t1dB

30HzV15kHz+1.5dB

Minimum

input

voltage

re-

30mV+2dB

quired

for

reference

level

35kQ

or

more

50mVi2dB

Load

resistance

50k

or

more

2.3V

or

more

Load

resistance

50kQ2

or

more

6k2

or

less

0.5%

or

less

At

reference

level

-20dB

or

less

at

19kHz

-20dB

or

less

at

38kHz

60dB

or

better

Input

terminal

shorted

with

4.

7kQ

100V

50/60Hz

U.S.

model.

117V

AC

50/60Hz

4W

500W

maximum

Power

switch

not

interlocked

3.4"

x

16.1"

x

10.7"

8.8

lbs

(4

kg)

Performance

data

and

spectfications

subject

to

change

with

future

modt

fications.

DOLBY

AMP

57240280

FUSE

HOLDER

POWER

SW

$5

DOLBY

METER

REC

LEVEL

REC

CAL

82

83

weeces

TRANS

250k

(A)

10k(B)

MODE

SW}

METER

S|

RECORDING

|

57240230

,

Sh

CHECK

REC

TONE

sw

ae

datas

s

250kA

CHASSIS

LAYOUT

TEST

POINT

VR1O3

VRLOL

TP-1

po

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Pert.

be

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VR102 VRLOS

VR104

VR106

ADJUSTABLE

PARTS

LOCATION

PRECAUTIONS

When

adjusting

the

AN-80,

use

special

care

to

eliminate

induction

hum,

not

to

mention

general

precautions

which

should

be

observed

when

servicing

precision

equipment.

When

adjusting

a

semi-fixed

variable

resistor,

be

sure

to

use

a

screw

driver

with

an

insulated

handle.

O

dB

=

0.775

V

INSPECTION

AND

ADJUSTMENT

LEVEL

METER

SENSITIVITY

TEST

(DOLBY

LEVEL

METER)

Depress

the

REC

TONE

switch

and

check

for

conformance

with

the

illustration.

If

the

pointer

is

not

within

the

specified

range,

adjust

with

VR-106.

Before

performing

this

adjustment,

measure

the

voltage

from

TP=-1

to

ground.

Indicated

reading

should

be

100

mV.

SPECIFIED

RANGE

POINTER

Cos

fee

RECORD

CHARACTERISTIC

TEST

-

Connect

the

test

equipment

as

shown

in

the

diagram.

CSToRTON

mere

Setting

Specified

Level

~

Place

the

REC CAL

variable

resistor

of

the

AN-80

in

the

fully

clockwise

position.

Set

the

MODE

switch

to

REC.

Set

the

DOLBY

switch

to

IN

and

the

METER

switch

to

L.

-

Set

the

AF

oscillator

frequency

at

100

Hz

and

adjust

the

ATT

so

the

AN-80

meter's

pointer

will

indicate

the

reference

level.

Make

certain

that

the

pointer

is

in

the

position

shown

in

LEVEL

METER

SENSITIVITY

TEST.

~-

The

distortion

factor

meter

reading

at

this

point

should

be

re-

garded

as

0

dB

when

measuring

the

frequency

response

or

SN

ratio,

or

as

100%

when

measuring

the

distortion

factor.

SN

RATIO

IMPROVEMENT

—

Connect

the

test

equipment

as

shown

in

the

diagram.

0-068T

Setting

Specified

Level

—

Load

the

test

tape

(product

No.

69911008-00)

supplied

with

the

AN-80

and

play

it

back.

—

Adjust

the

OUTPUT

variable

resistor

of

the

tape

deck

so

the

VU

meter

of

the

tape

deck

will

indicate

0

VU.

-

Set

the

MODE

switches

of

the

AN-80

to

PLAY

and

the

METER

switch

to

L.

Adjust

the

L

channel

PLAY

CAL

variable

resistor

so

the

level

meter's

pointer

will

indicate

the

reference

level

position.

—

Repeat

the

same

procedures

for

R

channel.

SN

Ratio

Improvement

Measurement

-

Load

a

tape

erased

with

a

eraser

and

select

the

playback

mode.

-

Set

the

noise

analyzer

frequency

at

1

kHz.

Set

the

AN-80

DOLBY

switch

to

OFF,

measure

the

noise

level,

and

record

the

measured

value.

The

difference

between

the

values

is

the

noise

improvement

at

1

kHz.

Repeat

the

same

procedures

for

R

channel.

-

Set

the

noise

analyzer

frequency

at

10

kHz

and

determine

the

dif-

ference

between

the

ON

and

OFF

values

as

in

the

foregoing

section.

ADJUSTMENT

PROCEDURE

Test

Equipment

Required

AF

Oscillator

(20

Hz

to

50

kHz

or

more)

AC

Voltmeter

Input

impedance

100k

or

more

Frequency

response

20

Hz

to

50

kHz

or

more

Attenuator

Oscilloscope

"B"

Weighting

Network

or

Noise

Analyzer

AN-80

Built-in

Oscillator

Level

Adjustment

-

The

purpose

of

this

adjustment

is

to

set

the

output

level

of

the

‘internal

calibration

oscillator

of

the

AN-80.

~

Connect

the

AC

voltmeter

between

the

test

point

(TP-1)

terminal

on

the

amplifier

PC

board

of

the

AN-80

and

the

ground

(27).

-

Set

the

L

channel

MODE

switch

to

REC.

-

While

depressing

the

REC

TONE

switch,

adjust

VR-105

so

the

AC

voltmeter

will

indicate

100

mV.

Level

Meter

Sensitivity

Adjustment

Adjust

the

sensitivity

of

the

AN-80

level

meter

using

the

internal

test

oscillator.

-

While

depressing

the

REC

TONE

switch,

adjust

VR-106

so

the

pointer

will

come

to

the

position

shown.

(Refer

to

illustration

below.)

DOLBY

LEVEL

METER

Playback

Amplifier

Input-Output

Characteristic

Adjustment

-

The

AN-80

varies

the

input-output

characteristics

in

accordance

with

the

level

or

frequency

of

the

input

signal

as

it

produces

a

record

signal.

In

the

playback

mode,

the

reverse

takes

place

to

restore

the

signal

to

its

original

state.

The

procedure

for

adjusting

the

playback

amplifier

follows.

Follow

the

procedure

for

L

channel

first

and

then

for

R

channel.

~

Connect

the

test

equipment

as

shown

in

the

diagram.

Place

the

L

channel

PLAY

CAL

variable

resistor

of

the

AN-80

in

the

fully

clockwise

position

and

set

the

MODE

switch

to

PLAY.

Set

the

AF

oscillator

frequency

at

100

Hz

and

the

output

voltage

at

-20

dB

(0

dB

=

0.775

V).

Adjust

the

ATT

so

the

AN-80

level

meter's

pointer

will

indicate

the

reference

level.

At

this

point,

read

the

output

level

on

the

voltmeter

and

let

this

value

be

0

dB.

Set

the

AF

oscillator

frequency

at

3

kHz

and

apply

20

dB

attenu-

ated

signal,

using

the

ATT.

;

Adjust

VR-101

so

the

AC

voltmeter

will

indicate

-27

dB.

VR-101

and

VR-103

will

interact

with

each

other,

coordinate

or

alternate

their

adjustment

until

the

specified

value

is

obtained

at

the

respective

points.

Note

that

0

dB

also

is

affected.

Set

the

AF

oscillator

frequency

at

5

kHz

and

apply

30

dB

attenuated

signal,

using

the

ATT.

Adjust

VR-103

so

that

AC

voltmeter

will

indicate

-40

dB.

After

L

channel

adjustment,

change

connections

to

R

channel,

set

the

R

channel

MODE

switch

to

PLAY

and

the

METER

switch

to

R.

Repeat

the

same

procedures

for

R

channel.

(VR-102/104)

Multiplex

Filter

Adjustment

When

an

FM

tuner

is

used

as

a

program

source,

the

AN-80

could

mal-

function

because

of

the

leak

carrier

of

the

FM

multiplex

circuit.

To

eliminate

this,

the

AN-80

has

a

built-in

filter

circuit.

The

procedure

for

adjusting

this

filter

circuit

follows.

Connect

the

devices

as

shown.

Set

the

MODE

switches

to

REC.

Set

the

AF

oscillator

frequency

at

100

Hz

and the

output

voltage

at

-20

dB

(O

dB

=

0.775V).

Adjust

the

ATT

so

the

AN-80

level

meter's

pointer

will

indicate

the

reference

level.

At

this

point,

read

the

output

level

on

the

voltmeter

and

let

this

value

be

O

dB.

Set

the

AF

oscillator

frequency

at

19kHz+1%

or

less

and

adjust

L-103

for

a

minimum.

After

L

channel

adjustment,

change

connections

to

R

channel

and

set

the

METER

switch

to

R.

Repeat

the

same

procedures

and

adjust

L-104

for

a

minimum.

(L-101

and

L-102

need

not

be

adjusted.)

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TEAC

PARTS

NO.

PARTS

LIST

DESCRIPTION

2nd

3rd

FRONT

PANEL

SECTION

57240320

57240330

57240360

50937960

50928730

50937270

57240370

57240380

50937220

Front

Panel

Assy

Panel,

Front

Ring,

Push

Button

Safty

Lens,

Lamp

Escutcheon,

Power

Switch

Push

Button,

Power

SW

Knob,

Record

Level

Knob,

Lever

Switch

Sheet,

Lever

SW

Protector

FRONT

CHASSIS

SECTION

57240880

57240160

50443710

57240170

50936690

50937580

50936690

50414500

50834240

57240180

57240190

57240200

50443700

57240210

50443210

'

50529060

Chassis,

Front

Potentiometer,

Rec

Level

250k2

A

Switch,

Push,

A

Potentiometer,

Rec

Calibration

10k2

B

Switch,

Lever

Switch,

Lever,

Dolby

Switch,

Lever

Lamp,

5¢

Cushion,

Lamp

Meter,

Level

Meter

Holder

Cushion,

Meter

Switch,

Push,

B

Potentiometer,

Play

Calibration

250k2

A

Switch,

Power

Spark

Killer

MAIN

CHASSIS

SECTION

57240220

57240940

50452060

57240230

57240820

50287730

57240240

50513970

Chassis,

Main

Stand-off

Terminal

Strip,

1L2P

Transformer,

Power

Transformer,

Power

(Foreign

only)

Mount

Foot

Bonnet

Resistor,

Carbon

4.7k2

1/4P

CIRCUIT

REF.NO.

J003

J001-002

FOOL

£002

E001

cool

TEAC

PARTS

NO.

PARTS

LEST

DESCRIPTION

REAR

PANEL

SECTION

57240250

50454071

50430190

50412070

50412130

50411010

50411260

50431150

50471651

50541110

50927610

Panel,

Rear

Terminal,

Ground

Jack,

Pin,

US

4P

Fuse

Holder

Fuse

Holder

(US

Market

only)

Fuse,

1A

(AC

100,

117V

area)

Fuse,

0.5A(AC

220,240V

area)

AC

Outlet

Cord,

AC

Cap.,

UL

Oil

Filled

0.0047uF

450V

AC

Voltage

Selector(Foreign

only)

3rd

CIRCUIT

REF.NO.

Q101/102

Q103/104

Q105/106

Q107/108

Q109/110

Q111/112

Q113/114

Q115/116

Q117/118

Q119/120

D101/102

D103/104

D105/106

D107

D108

D109/110

D111/112

PARTS

LIST

DOLBY

UNIT

AMPLIFIER

TEAC

PARTS

NO.

DESCRIPTION

1st

and

3rd

57240280

PC

Board

Assy,

Dolby

Unit

Amp

SILICON

TRANSISTORS

50423660

2S8C732-BL

50423510

28C733-Y

50423520

2SA562-Y

50423660

2S8C732-BL

50423660

2SC732-BL

50939410

FET

2SK30-Y

50423510

28C733-Y

50423520

2SA562-Y

50423510

28C733-Y

50423510

28C733-Y

DIODES

50422440

Silicon,

$3016-R

50422130

Germanium,

1N60

50422440

Silicon,

$3016-R

50422640

Zener,

02Z

7.5A

50422440

Silicon,

S3016-R

50422130

Germanium,

1N60

50422340

Silicon,

FR2-02

CARBON

RESISTORS

ALL

RESISTORS

IN

OHM,

10%

TOLERANCE,

1/4

WATT

AND

CARBON

TYPE

UNLESS

OTHERWISE

NOTED.

RLO1/102

R1L03/104

R105/106

R107/108

R109/110

R111/112

R113/114

R115/116

R117/118

R119/120

R121/122

R123/124

R125/126

R127/128

R129/130

R131/132

R133/134

R135

/136

R137/138

R139/140

R141/142

R143/144

50518370

470k

50513700

100k

50513960

3.3k

50513910

560

50513300

100

50519440

39k

50519230

6.8k

50513950

2.2k

50513910

560

50513310

120

50513720

150k

50513890

18k

50513890

18k

50513720

150k

50513590

15k

50518050

2.7k

50519170

33k

50513860

27k

50513880

5.6k

50513960

3.3k

50519440

39k

50513860

27k

PARTS

LIST

DOLBY

UNIT

AMPLIFIER

CIRCUIT

REF

.NO.

R145/146

R147/148

R149/150

R151/152

R153/154

R155/156

R157/158

R159/160

R161/162

R163/164

R165/166

R167/168

R169/170

RL71/172

R173/174

RL75/176

R177/178

R179/180

R181

R182

R183

R184

R185

RL86

R187

R188

RL89

R190

R191

R192/193

VR101/102

VR103/104

VR105

VR106

TEAC

PARTS

NO.

50513940

50518370

50513820

50513590

50518830

50513970

50519170

50518370

50519580

50518050

50513430

50518690

50519610

50513590

50518890

50513570

50518890

50518380

50513430

50513960

50513990

50513860

50513960

50513300

50513870

50513570

50513970

50525460

50527100

DESCRIPTION

3.

9k

470

1M

15k

8.2k

4.7k

33k

470k

4.7k

Metal

Oxide

Film

10

1W

Metal Oxide

Film

220

1W

TRIMMER

RESISTORS

50533480

50533530

50533760

50533640

10kQ

B

1k2Q

B

3302

B

2.2kQ

B

3rd

PARTS

LIST

DOLBY

UNIT

AMPLIFIER

C101/102

50554810

Elec.

1

25V

;

C103/104

50548450

Mylar

0.0022

50V

C105/106

50543400

Polyst.

3300p

50V

C107/108

50548120

Mylar

0.0015

50V

[

2109/110

50554050

Elec.

10

16V

‘

©@211/112

50554810

Elec.

1

25V

(113/114

50554050

Elec.

10

16V

C115/116

50554430

Elec.

4.7

16V

C117/118

50548260

Mylar

0.0056

50V

C119/120

50548330

Mylar

0.027

50V

(121/122

50548130

Mylar

0.0047

50V

C123/124

50554050

Elec.

10

16V

C125/126

50548040

Mylar

0.1

50V

C127/128

50554050

Elec.

10

16V

C129/130

50554050

Elec.

10

16V

C131/132.

50548040

Mylar

0.1

50V

C133/134

50554050

Elec.

10

16V

C135/136

50548040

Mylar

0.1

50V

C137/138

50548040

Mylar

0.1

50V

C139/140

50548830

Metalized

Mylar

0.33

50V

C141

50548040

Mylar

0.1

50V

C142

50554810

Elec.

1

25V

C143°144

50548420

Mylar

0.015

50V

{

GL45

50548270

Mylar

0.047

50V

C146

50554050

Elec.

10

16V

C147

50554650

Elec.

330

35V

C148

50554420

Elec.

470

25V

C149

50554890

Elec.

1000

16V

C150

50542230

Ceramic

0.01

500V

C151

50542230

Ceramic

0.01

500V

:

COILS

,

L101/102

57240300

L.P.F.

36mH

(White)

L103/104

57240310

19kHz

(Yellow)

“CIRCUIT

REF.NO.

j

TEAC

PARTS

NO.

DESCRIPTION

CAPACI

TORS

ALL

CAPACITORS

IN

MICRO

FARADS

UNLESS

OTHERWISE

NOTED.

2nd

3rd

Teac AN-80 User manual

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