Teac A-300 Manual de usuario

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Stereo

Cassette

Deck

with

Dolby

System

NOTE

If

any

of

the

adjustments

or

repairs

seem

too

compli-

cated

or

are

difficult

to

accomplish,

please

contact

the

nearest

TEAC

Factory

Service

Department

or

write

directly

to

a

TEAC

office,

the

addresses

of

which

are

printed

on

the

back

cover

of

this

manual.

When

ordering

replacement

parts,

please

refer

to

the

PARTS

LIST

which

is

printed

separately

from

this

manual

and

included

as

an

insert.

TEAC

CORPORATION

51032580

TABLE

OF

CONTENTS

1.

Test

Equipment

Required

.............

2

5,

Mechanical

Checks

and

Adjustments

......

9

5-1.

Take-up

&

Supply

Torque

...........-.

9

2.

Specifications

&

Service

Data

...........

3

5-2.

Fast

Forward

&

Rewind

Torque

.........

9

5-3.

Pinch

Roller

Pressure...

2...

2.

ee

eee

9

TEAC

Test

Tape...

0...

eee

ee

3

5-4,

Tape

Speed/Wow

and

Flutter

...........

10

3.

Parts

Location

..........

0002-00000.

5

6.

Electrical

Chekcs

and

Adjustments........

11

6-1.

Playback

Performance

.............04.

11

4,

Itlustrated

disassembly

procedures

........

6

6-2.

Monitor

Performance

.............-5-

13

4.1,

External

Parts

2.2.0...

.0...0c..0.00000-

6

6-3.

Recording

Performance

.............-.

14

4.2.

Cassette

Damper

(Damper

Cord

Stringing)...

6

6-4,

Adjustment

Location

..............0-

20

4.3,

Cassette

Holder

Ass’y

.............0..

6

4.4,

Heads

and

pinch

rollers

...............

7

7.

Block

Diagram

......

in

deft

ae

at

aes

Ste

tagey

on

21

4.5,

Reel

Tablesi

a

cescc.e

onc

oa

tho

ee

aeceeacre

7

4-6.

Brake

Plate

Ass’y

............200000.

7

8.

Eevel

Diagram

2.440

eck

os

ee

obese

Oakes

21

4-7.

MOtobs

ax

42d

tiled

ge

884

see

Fons

8

4-8,

Capstan

Drive

Assy

.............000.

8

9.

Voltage

and

Frequency

Setting

..........

23

4-9,

Lubrication

vc

..cg

shee

eiaiee

sy

oP

RSS

8

4-10,

Ilder/Tension

Pulley

Ass’y

.............

8

*

Noise

reduction

circuit

made

under

license

from

Dolby

Laboratories

Inc.

The

word

“Dolby”

and

the

Double-D

symbol

are

trademarks

of

Dolby

Laboratories

Inc.

1.

TEST

EQUIPMENT

REQUIRED

1.

Cassette

Torque

Meter:

For

take-up

check:

0

~

100

g-cm

(0

~

1.4

02-inch)

For

fast

forward

&

rewind

torque

checks:

0

~

160

g-cm

(0

~

2.2

02-inch)

|

NOTE:

When

ordering

Cassette

Torque

Meter,

allow

for

longer

delivery

time

that

is

required

for

it.

2.

Spring

scale:

For

Pinch

Roller

pressure

check:

0

~

500

g

(1.1

Ibs)

3.

Wow/flutter

meter:

MEGURO

DENPA

SOKKI

K.K.,

Model

MK-668A

:

4,

Frequency

counter:

Digital

type,

capable

of

10

Hz

to

100

kHz

indication.

fore

5.

AF

oscillator:

10

Hz

~

100

kHz

6.

AC

Voltmeter:

0.1

mV

~

300V

7.

Attenuator:

General

Purpose

8.

Distortion

analyzer:

Basic

frequency

400

Hz/1

kHz

9.

Oscilloscope:

General

Purpose

10.

Band-pass

filter:

1

kHz

narrow

band-pass

type

11.

Test

load

resistor:

Non

inductive

type

8

ohm/1

W

12.

Plastic

alignment

tool:

13.

Head

demagnetizer:

TEAC

E-3

or

equivalent

5

14.

Cleaner:

TEAC

TZ-261

Tape

Recorder

Cleaner

kit

or

pure

alcohol

§

15.

Oil:

TEAC

TZ-255

Oil

kit

or

equivalent

Fig.

1-1

Plastic

Alignment

Too!

2.

SPECIFICATIONS

&

SERVICE

DATA

SPECIFICATIONS

———____—CO

TTT

Track

System

3

Heads

Type

of

Tape

Tape

Speed

Inputs

(level

and

impedance)

Outputs

(level

and

load

impedance)

Equalization

Head

Configuration

Motor

Bias

Frequency

Operating

Position

Power

Requirements

Power

Consumption

Weight

*

Pursuant

to

DIN

Standards

TEAC

TEST

TAPE

REMARKS:

0

dB

=

DIN

Reference

level

(333

Hz)

For

tape

speed

&

wow/flutter

test

MTT-111:

For

Playback

method

3,000

Hz/—10

dB

NOTE:

The

TEAC

test

tapes

require

longer

delivery

time

MTT-501:

For

record/Playback

method

(blank

tape):

than

normal

parts.

MTT-150:

For

Dolby

level

calibration

Dolby

B-type

tone

(400

Hz

tone),

200

nWb/m

MTT-316:

For

frequency

response

test

for

EQ:

CrO2

3,180

us

+

70

ys

315

Hz/—4

dB,

31.5

Hz

~

14

kHz/—24

dB

MTT-216:

For

frequency

response

test

for

EQ:

NORMAL

3,180

ps

+

120

us

315

Hz/—4

dB,

31.5

Hz

~

14

kHz/—24

dB

4-track,

2-channel

stereo

Erase,

Record

and

Playback

Cassette

tape,

C-60

and

C-90

(Philips

type)

4.8

cm/s

(1-7/8

ips)

MIC:

Specified

input

level:

—57

dB

(1.09

mV)/10

kohms

Min.

input

level:

—67

dB

(346

uV)

LINE

IN:

Specified

input

level:

—9

dB

(275

mV)/50

kohms

Min.

input

level:

—19

dB

(86.9

mV)

DIN

IN*:

Min.

input

level:

—35

dB

(13.8

mV)

OUTPUT:

Max.

output

level:

—2.5

dB

(580

mV)/SO

kohms

Specified

output

level:

—5

dB

(436

mV)

Headphones:

Specified

output

level:

—21

dB

(69

mV)/8

ohms

CrO2:

3180

us

+

70

us

NORMAL:

3180

us

+

120

us

1/2-track,

1-channe]

Erase

Head

1/4-track,

2-channel

Dual-gap

Record

and

Playback

Heads

FG

Servo

Controlled

DC

Motor

100

kHz

Horizontal

100/117/220/240

V

AC,

50/60

Hz

(General

Export

Models)

117

V

AC,

60

Hz

(U.S.A./Canada

Models)

220

V

AC,

50

Hz

(Europe

Model)

240

V

AC,

50

Hz

(U.K./Australia

Models)

12W

(U.S.A.

Model)

11W

(All

except

U.S.A.

Model)

7.5

kg

(16.5

Ibs)

net

7.8

kg

(17.2

Ibs)

net

(General

Export

Models

for

Limited

Area)

For

playback

performance

alignment

For

record

performance

alignment

(blank

tape)

MTT-506

or

equivalent:

For

BIAS

&

EQ:

CrO2

MTT-501

or

equivalent:

For

BIAS

&

EQ:

NORMAL

Fig.

2-1

-

TEAC

Test

Tape

SERVICE

DATA

Mechanical

Tape

Speed

Deviation

Tape

Speed

Drift

Wow

and

Flutter

Pinch

Roller

Pressure

Reel

Torque

(Take

Up)

Reel

Torque

(Back

Tension)

Fast

Winding

Time

Electrical

Frequency

Response

Signal

to

Noise

Ratio

Erase

Efficiency

Channel

Separation

Crosstalk

between

Adjacent

Tracks

Total

Harmonic

Distortion

3,000

Hz

+

45

Hz

45

Hz

Playback:

0.10%

(WRMS)

Record/Playback:

0.25%

(RMS)

400

g

+

50

g

(12.3

to

15.9

0z)

Play

and Rec/Play:

40

to

60

g-cm

(0.6

to

0.8

oz-inch)

Fast

Forward:

80

to

150

g-cm

(1.1

to

2.1

oz-inch)

Rewind:

100

to

150

g-cm

(1.4

to

2.1

oz-inch)

Play

and

Rec/Play:

3

to

8

g-cm

(0.04

to

0.11

oz-inch)

90

seconds

for

C-60

Refer

to

frequency

response

limits

charts

on

page

12

and

16.

Playback

method:

47

dB

min.

Record/Playback

method:

BIAS/EQ,

CrO2

45

dB

min.

BIAS/EQ,

NORMAL

44

dB

min.

With

Dolby

Noise

Reduction

used

for

recording

and

playback,

S/N

ratio

is

improved

by

up

to

5

dB

at

1

kHz

and

up

to

10

dB

at

frequencies

over

5

kHz.

65

dB

min.

30

dB

min.

(at

1

kHz)

40

dB

min.

(at

125

kHz)

BIAS/EQ,

CrO:2

:

2.2%

(max.)

BIAS/EQ,

NORMAL:

2.5%

(max.)

NOTE:

e

Improvements

may

result

in

Specifications

and

Service

Data

changes.

e

dB

values

in

the

Specifications

and

Service

Data

are

based

on

0

dB

=

0.775

V.

In

case

the

AC

Voltmeter

being

used

is

calibrated

to

some

other

standard

such

as

0

dB=

1

V

etc,

please

use

the

voltage

values

given

in

parentheses

as

the

test

values.

17-1/2“(444

mm)

16-3/16'(410mm)

11-1316'(300mm)

r

i

t

t

1

t

!

1

1

1

i

4

1

1

L

FEEEEER

coe

©

~1/4"(IS8mm)

bee

eee

eo

ee

T-1038~I

*

Broken

line

indicates

General

Export

Models

for

Limited

Areas.

Fig.2-2

Dimensions

3.

PARTS

LOCATION

VOLTAGE

SELECTOR

PCB

Ass’y

(for

General

Export

Models)

IN/OUTPUT

PCB

Ass’y

Power

Transformer

REC

AND

PLAY

MECHANISM

:

PCB

Ass’y

AMPL.

PCB

Ass

y

Damper

Holder

Ass’y

DC

Motor

Ass’y

Fig.

3-1

Top

View

Cassette

Holder

Ass'y

Counter

Ass'y

Supply

Take-up

Reel

Table

Ass'y

VU

Meters

Reel

Table

Ass'y

Erase

Head

REC-PLAY

Head

Pinch

Roller

Ass'y

Fig.

3-2

Front

View

4.

ILLUSTRATED

DISASSEMBLY

PROCEDURES

GENERAL

NOTES

1.

Disassemble

in

number-order.

.

Use

the

proper

tools.

Demagnetize

the

tools

before

use.

3,

When

mounting

or

removing

a

spring,

check

the

posi-

tion

(direction)

of

the

anchor

or

hook.

The

wrong

position

may

change

the

tension.

4.

When

reassembling,

don’t

forget

to

reinstall

all

hard-

ware

such

as

springs

and

washers

etc.

5.

To

check

the

shape

of

assembling

hardware

(screws,

etc.)

see

ASSEMBLING

HARDWARE

CODING

LIST

in

the

parts

list.

4-1.

EXTERNAL

PARTS

4-M4x6

(Round

Washer

Head)

BM3x6

Fig.

4-1

External

Parts

4-2,

CASSETTE

DAMPER

(DAMPER

CORD

STRINGING)

Preparation

Remove

in

number-order.

1.

Fig.4-1,

2

and

3.

T1742

Fig.

4-2

Cassette

Damper

4-3.

CASSETTE

HOLDER

ASS’Y

Preparation

Remove

in

number-order.

1.

Fig.4-1,

1

-thru-8.

2.

Fig.

4-2,

1.

ee

a

a

Se

‘

ee

a

Re

a

8

pT.

W4x10.25

a

CE

WW

24x10.5

W4x10.5,

.

oo

ee

tiga

Pe,

Dyk

mS

oe

|S

_

2-PSA

Bae

6

M2.644

Y

Fig.

4-3

Cassette

Holder

Ass'y

44.

HEADS

AND

PINCH

ROLLER

Preparation

Remove

in

number-order.

1.

Fig.

4-1,

1-thru-8.

2-Sw

2

2-8

o®

Y

5

M2xi2

;

Pr

®

Ye

We

SW

42

BM2xi2

Fig.4-4

Head/Pinch

Roller

ERASE

HEAD

REC~PLAY

HEAD

unt

oT

iy

NO)

aT

>

YEL

3G

OYBLU

ie

°

a

WHT

WHT

WHT

T1744

DD

Fig.

4-5

Head

Wiring

Diagram

NOTE:

1.

After

replacing

the

head,

always

adjust

the

head

alignment,

especially

the

Record/Playback

Head’s

azimuth

and

then

secure

the

screws

and/

or

the

nut

with

a

drop

of

locking

paint.

2.

Connect

the

wires

to

the

head

terminal

pins

quickly

to

prevent

breaking

of

internal

wires

of

the

head

due

to

overheating.

3,

After

replacement,

always

clean

the

driving

sur-

.

faces

of

the

Pinch

Roller

with

the

TEAC

TZ-

261B

Rubber

Cleaner

or

with

pure

alcohol,

then

proceed

directly

to

the

PINCH

ROLLER

PRESSURE

adjustment

section.

4-5.

REEL

TABLES

Preparation

Remove

in

number-order.

1.

Fig.4-1,

1

-thru-

8.

2.

Fig.4-2,

1.

3.

Fig.

4-3,

1

-thru-

13.

4

3

£

-

5

.

aa

<

(\O"

7

ee

B15x84x10.25

2-€ 012

EN

\

Za

6.

/

x?

ST

x10.5

be)

SS

Fig.

4-6

Reel

Tables

4-6.

BRAKE

PLATE

ASS’Y

Preparation

Remove

in

number-order.

1.

Fig.4-1,

1

-thru-

8.

2.

Fig.4-2,

1.

3.

Fig.

4-3,

1

-thru-

13.

Eeae

W

$3X10.25

3

Fig.4-7

Brake

Plate

Ass’y

4-7,

MOTOR

Preparation

Remove

in

number-order.

1.

Fig.

4-1,

2

and

3.

Fig.

4-8

Motor

NOTE:

1.

When

re-assembling,

clean

the

pulley

and

the

Belt

with

TEAC

TZ-261

Cleaner

kit

(“A”

for

the

Pulley,

““B”

for

the

Belt)

or

with

pure

alcohol.

2.

Take

off

or

remount

the

Motor

Ass’y

taking

care

not

to

scratch

or

otherwise

damage

the

Motor

Pulley.

3.

When

re-attaching

the

Drive

Belt

to

the

Pulley

do

not

twist

or

stretch

the

belt.

4-8.

CAPSTAN

DRIVE

ASS’Y

Preparation

Remove

in

number-order.

1.

Fig.

4-1,

1-thru-

3.

2.

Fig.

4-8,

1

-thru-3.

Fig.

4-9

Capstan

Drive

Ass’y

4-9.

LUBRICATION

Refer

to

Fig.

4-9.

Lubrication

should

be

generally

done

at

about

every

1,000

hours

of

operating

time

of

the

tape

deck.

Use

high

quality

oil

for

this

purpose.

For

efficient

oiling,

it

is

recommended

that

lubrication

be

done

after

nearly

1

hour

of

idling

of

the

deck

and

while

it

is

still

warm.

Normally,

it

is

necessary

to

lubricate

only

the

areas

de-

scribed

below.

1.

Apply

a

drop

of

a

light

machine

oil

of

good

quality

(e.g.:

TEAC

TZ255)

with

an

oil

applicator

to

the

shaft

of

the

Flywheel

and

spread

oil

evenly

over

the

shaft

with

a

flannel

cloth.

After

installing

the

Flywheel,

be

sure

to

clean

the

tape

moving

portion

of

shaft

with

TEAC

TZ-261

A

Head

Cleaner

or

with

pure

alcohol.

2.

Apply

a

drop

of

the

proper

oil

in

the

same

way

as

above

to

the

innermost

area

of

capstan

shaft

(next

to

the

Flywheel).

3.

Apply

a

film

of

light

grease

to

the

well

of

the

Flywheel

Bearing.

4-10.

IDLER/TENSION

PULLEY

ASS’Y

Preparation

Remove

in

number-order.

1.

Fig.

4-1,

2

and

3.

2.

Fig.

4-8,

1-thru-3.

3.

Fig.

4-9,

1-thru-4.

Fig.

4-10

Idler/Tension

Pulley

Ass’y

5.

MECHANICAL

CHECKS

AND

ADJUSTMENTS

5-1.

TAKE-UP

AND

SUPPLY

TORQUE

Specifications:

—

5-3.

PINCH

ROLLER

PRESSURE

Take-up:

40

to

60

g-cm

(0.6

to

0.8

oz-inch)

Supply:

3

to

8

g-cm

(0.04

to

0.11

oz-inch)

Depress

POWER

Switch

ON

to

apply

AC

power.

Load

the

cassette

torque

meter

(for

take-up

and

supply

torques).

Place

the

deck

in

the

play

mode

and

read

the

pointer

indication

on

the

right-hand

dial

scale

to

check

the

take-up

torque.

While

continuously

playing,

read

the

pointer

indication

on

the

left-hand

dial

scale

to

check

the

supply

torque.

If

the

reading(s)

are

out

of

the

specified

range,

clean

the

driving

surfaces

of

the

reel

table

ass’y

and

all

other

driving

parts

relative

to

the

take-up

and

supply

torque

function

with

the

TEAC

TZ-261B

rubber

cleaner

or

which

pure

alcohol.

If

the

above

cleaning

is

ineffective

for

torque

correc-

tion,

replace

the

Reel

Table

Ass’y.

5-2.

FAST

FORWARD

&

REWIND

TORQUE

Specifications:

Fast

Forward

torque:

80

to

150

g-cm

(1.1

to

2.1

oz-inch)

Rewind

torque:

100

to

150

g-cm

(1.4

to

2.1

oz-inch)

Depress

POWER

Switch

ON

to

apply

AC

power.

Load

the

Cassette

Torque

Meter

(for

fast

forward

and

rewind

torque).

Place

the

deck

in

the

FF

or

REW

mode

and

read

the

pointer

indication

on

the

dial

scale.

The

Meter

should

indicate

a

torque

of

80

to

150

g-cm

(1.1

to

2.1

oz-inch)

as

Fast

Forward

Torque

and 100

to

150

g-cm

(1.4

to

2.1

oz-inch)

as

Rewind

Torque.

If

the

indication

is

out

of

specified

range,

clean

the

driving

surfaces

of

the

Reel

Table

Ass’y

and

all

other

driving

parts

relative

to

the

Fast

Forward

&

Rewind

torque

function

with

the

TEAC

TZ-261B

Rubber

Cleaner

or

with

pure

alcohol.

—

“If

the

above

cleaning

is

ineffective

for

the

torque

correction,

replace

the

driving

parts

relative

to

these

torques.

Fig.

5-1

Cassette

Torque

Meter

Specification:

400g

+

50

g

(12.3

to

15.9

02)

RWNe

Remove

Front

Panel,

then

Cassette

Holder

Ass’y.

Depress

POWER

Switch

ON

to

apply

AC

power.

Place

the

deck

in

the

PLAY

mode

with

no

tape

loaded.

Attach

the

spring

scale

to

the

Pinch

Roller

shaft

as

shown.

Gently

draw

the

Pinch

Roller

away

from

the

Capstan

shaft

in

a

directly

downward

direction

until

the

Cap-

stan

shaft

and

the

Pinch

Roller

are

completely

sepa-

rated,

Gradually

return

the

scale

back

until

the

Pinch

Roller

just

begins

to

rotate.

The

scale

should

then

be

reading

approximately

400

g

+

50

g

(12.3

to

15.9

oz).

If

the

reading

is

out

of

specified

range,

replace

the

Pinch

Roller

Ass’y

or

the

Pressure

Spring

or

adjust

the

Spring

Arm

as

shown.

Bend

here

to

adjust

Fig.

5-2

Pinch

Roller

Pressure

Measurement

5-4.

TAPE

SPEED/WOW

AND

FLUTTER

Specifications:

Tape

Speed

Deviation:

3,000

Hz+

45

Hz

Tape

Speed

Drift:

45

Hz

Wow

and

Flutter:

Playback:

0.10%

(WRMS)

Record/Playback:

0.25%

(RMS)

NOTE:

1.

Before

performing

this

adjustment,

clean

all

parts

in

the

tape

path,

particularly

the

Capstan,

the

Pinch

Roller

and

the

Heads

with

the

appro-

priate

liquid

from

the

TEAC

TZ-261

Cleaner

Kit

or

with

pure

alcohol.

2.

Wow

and

flutter

should

be

checked

in

two

ways;

Playback

only

and

Record/Playback

methods.

First

correct

tape

speed

and

wow

and

flutter

using

the

playback

only

method.

Then

measure

wow

and

flutter

using

record

and

play-

back

method.

3.

As

the

measured

results

may

vary

with

respect

to

location

on

tape

at

which

it

was

taken,

three

points

—

at

beginning,

middle

and

near

the

end

of

the

tape

—

should

be

measured.

54-1.

TAPE

SPEED

1.

Connect

test

equipment

to

the

deck,

except

the

AF

oscillator,

as

shown

in

Fig.

5-3.

2.

Set

the

EQ

switch

to

NORMAL

position,

and

then

load

and

play

a

TEAC

MTT-111

test

tape

(3,000

Hz

signal

is

recorded),

3.

Adjust

the

control

located

at

the

center

of

the

Motor

for

reading

of

3,000

Hz

+

10

Hz

on

the

frequency

counter,

(NOTE:

This

tape

speed

setting

should

be

done

after

approx,

30

seconds

of

operating

time

of

the

deck).

4.

Then,

verify

the

reading

on

the

frequency

counter

as

within

the

specified

range

of

3,000

Hz

+

45

Hz,

and

the

tape

speed

drift

is

within

45

Hz

at

any

portion

of

the

tape

run.

5.

If

the

tape

speed

is

extremely

out

of

the

specification,

check

the

Pinch

Roller

pressure

and

the

tape

driving

function

for

correction,

and

make

sure

the

tape

path

is

clean.

5-4-2,

WOW

AND

FLUTTER

After

making

the

tape

speed

measurement,

perform

the

wow

and

flutter

test

using

the

Playback

Method

and

the

Record

/Playback

Method

successively.

PLAYBACK

METHOD

1.

Play

the

MTT-111

test

tape.

2.

Read

the

indication

on

the

wow

and

flutter

meter.

3.

The

wow

and

flutter

value

should

be

0.10%

WRMS,

max.

10

FREQUENCY

COUNTER

wow

&

FLUTTER

METER

DECK

under

TEST

¢

+463

Fig.

5-3

Tape

Speed/Wow

&

Flutter

Measurement

Setup

,

TAPE

SPEED

ADJ.

¥

f

3,000Hz

+

10Hz

OA

aude

wr

T-1679

Fig.

5-4

Tape

Speed

Adjustment

Location

4.

If

the

wow

and

flutter

is

out

of

specification,

check

the

Pinch

Roller

pressure

and

the

take-up

torque,

see

that

the

tape

path

is

clean,

and

that

the

Capstan

Belt

is

not

stretched

or

oily.

5.

If

the

above

checks

are

ineffective

for

excessive

wow

and

flutter

correction,

repair

or

replace

the

Pinch

Roller,

the

Capstan

Belt

and/or

any

other

defective

parts.

RECORD/PLAYBACK

METHOD

NOTE:

When

using

this

method,

adopt

the

maximum

wow

and

flutter

value

obtained

by

repeated

play

and

stop

modes

of

operation.

This

operation

is

neces-

sary

to

make

sure

wow

and

flutter

content

be-

tween

record

and

playback

will

not

be

in

phase

to

create

a

false

reading.

1.

Connect

test

equipment

to

the

deck

as

shown

in

Fig.

5-3.

2.

Set

LINE

or

RECORD

controls

on

the

deck

to

obtain

convenient

input

levels.

3.

Load

a

TEAC

MTT-SO1

test

tape

(blank)

and

set

the

BIAS/EQ

switches

in

the

NORMAL

positions.

Apply

and

record

a

3,000

Hz

signal.

Rewind

and

play

this

recorded

section.

Read

the

indication

on

the

wow

and

flutter

meter.

The

wow

and

flutter

value

should

be

0.25%

RMS

max.

If

the

measured

value

is.

out

of

specification,

repair

using

the

same

methods

as

stated

in

steps

4

—

5

in

the

Playback

Method

procedure.

On

Nn