Teac W-470 Manual de usuario

Tabla de contenidos

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TEAC.

SERVICE

MANUAL

w-470

Stereo

Double

Cassette

Deck

CAUTION

A

Parts

maked

with

this

sign

are

safety

critical

components.

*

Dolby

noise

reduction

manufactured

under

license

from

Dolby

Laboratories

Licensing

Corporation.

“DOLBY”

and

the

double-D

symbol

OO

are

trademarks

of

Dolby

Laboratories

Licensing

Corporation.

They

must

always

be

replaced

with

identical

components—

refer

to

the

appropriate

parts

list

and

ensure

exact

replacement.

Effective:

JULY,

1989

9103003100

septum

dhsaeniic

}

4

{

4

W-470

1.

SPECIFICATIONS

AND

SERVICE

DATA

SPECIFICATIONS

Track

System

4-track,

2-channel

stereo

Heads

Play

I:

Playback

#1

REC/PLAY

I:

Erase

*1,

Record/Playback

*1

Type

of

Tape

Cassette

tape,

C-60

and

C-90

(philips

type)

Tape

Speed

4.76

cm/s(1-7/8

ips),

9.5cm/s

(3-3/4ips)

3

(Hi

speed

Dubbing)

Input.

(level

and

impedance)

LINE

IN:

Specified

input

level:

-9dB

(275

mV)/50

kohms

Min.

input

level:

~19dB

(86. 9nV)

Output

(level

and

load

impedance)

OUTPUT:

Spec.

output

level:

-3dB

(548mV)

PHONES:

Spec.

output

level:

-19dB

(86.9nV)/8

ohms

Equal

ization

METAL:-

3180uS+

70uS

Cr02:

3180

uS+

‘70uS

NORMAL:

3180

4S+

120

uS

Head

Configuration

1/2-track,

1-channel

erase

head

1/4-track,

2-channel

record/playback

head

Motor

PLAYI:

1

DC

servo

motor,

REC/PLAY

I:

1

DC

servo

motor

Bias

Frequency

100kHz

Operation

Position

Horizontal

Power

Requirements

120/220/240

V

AC,50/60Hz

(General

Export

Models)

120

V

AC,60Hz

(U.S.

A/Canada)

220

V

AC,50Hz

(Europe)

240

V-AC,50Hz

(U.K./Australia)

100

V

AC,50Hz

(JAPAN)

Power

Consumption

12

Weight

4,7kg

(10.36

lbs)

Dimensions

(WHD)

435%1274262mm

(17-1/8"5"810-5/16")

NOTES:

Improvements

may

result

in

SPECIFICATIONS

AND

SERVI

DATA

chanfes.

Value

of

"dB"

in

the

data

refers

to

0

dB

(©.775

V),

expect

where

Specified.

SERVICE

DATA

MECHAN

ICAL

Tape

Speed

Deviation

3,000

Hz

+90,-90

Hz,6000

Hz+180,

-180

Hz

Tape

Speed

Drift

45

Hz

(LOW

SPEED),90Hz

(HIGH

SPEED)

Yow.

and

Flutter

Playback:

0.30

96

(WRMS)

Pinch

Roller

Pressure

250

g

to

470

g

(8.80z

to

16.5

oz)

Reel

Torque

Take-up:

35

to

70

g-cm

(0.49

to

0.97

02-inch)

Supply:

2.5

to

6

e-cm

(0.035

to

0.083

0Z-inch)

F.F:

70

to

160

g-cm

(0.97

to

2.22

0Z-inch)

REW:

70

to

160

g-cm

(0.97

to

2.22

0Z-inch)

Fast

Wind

Time

125

sec

or

less

for

MIT-5511

(C-60)

Auto

End-stop

Time

5

sec.

or

less

ELECTRICAL

Frequency

Response

See

Figs.

5-7

&

5-9

Signal-to-noise

Ratio

Playback:

NORMAL:

46

dB

min.

Record/P

layback

METAL,

Cr02:

45

dB

min.

NORMAL:

44

dB

min.

Erase

Efficiency

65

dB

min.

at

1

kHz

(measured

with

input

10

dB

higher

than

the

specified

input

level).

Channel

Separation

30

dB

min.

at

1

kHz

Adjacent

Track

Crosstalk

40 dB

min.

at

125

Hz

Total

Harmonic

Distortion

2.0

%

or

less

with

NORMAL

2.5

%

or

less

with

Cr02,METAL

W-470

2

CASE

AND

FRONT

PANEL

REMOVAL

es

ie

aa

i

|

i

i

i

—

}

i

i

4

4

eGlis

obs

a

ee

aes

{

t

ee

te

alt

|

POWER

TRANSFORMER

POWER

PCB

3

PARTS

LOCATION

PLAY

[

MECH

REC/PLAY

Il

MECH

Fig.

3-1

Top

view

(W-470)

R/P

AMPL

PCB

METER

PCB

W-470

4

MECHANICAL

ADJUSTMENT

AND

CHECKS

4-1

WOW

AND

FLUTTER

Note:

This

measurement

should

be

made

at

the

begining,

middle,

and

the

end

of

the

tape.

PLAYBACK

1,

Connect

a

wow-and-flutter

meter

to

the

deck

as

shown

in

Fig.

41.

2.

Load

and

play

a

TEAC

MTT-111

test

tape.

3.

Check

that

the

reading

on

the

wow-and-flutter

meter

is

within

0.38%

(RMS).

4.2

TAPE

SPEED

1.

Connect

a

frequency

counter

to

the

deck

as

shown

in

Fig.

4-1.

2.

Simply

press

POWER

switch

to

ON

to

rotate

the

motor,

then

continue

the

motor

rotation

for

approx.

1

minute

for

warmp-up.

3.

As

soon

as

the

warm-up

finishes,

load

a

TEAC

MTT-111

test

tape

with

a

3,000

Hz

test

tone

and

play

the

end

of

the

test

tape.

4.

Adjust

each

variable

resistor

to

get

the

following

figures.

Short

TP

(SPEED

ADJ)

to

get

the

double

tape

speed

(HIGH

speed),

Never

press

TAPE

SPEED

switch

to

HIGH

position.

[Adjustment

point

[Adjustment

value

aye

HIGH

speed

|

R31

|

6020

~

6040

LOW

speed

|

R32

|

3010

~

3020

HIGH

~

602

REC/PLAY

II

steed

Litas

LOW

speed

3000

~

3010

*

At

first,

adjust

NORMAL

tape

speed.

5.

In

play

mode,

check

that

the

following

figures

are

obtained

at

the

beginning

and

at

the

end

of

the

tape.

fot

oan

eel

LOW

speed

-

HIGH

speed

3000

Hz

+90,

—90

Hz

[6000

Hz

+180,

—180

Hz

Speed

drifting

|

Within

45

Hz

|

Within90Hz

Frequency

Counter

Oscillator

Wow

&

Fiutter

Meter

DECK

under

TEST

R

(R)

LINE

IN

OUTPUT

Fig.

4-1

43

REEL

TORQUE

1.

Load

the

cassette

torque

meter

on

the

deck

and

read

the

pointer

indication

on

the

dial

scale

for

each

tape

transport

operation.

The

measured

torque

should

be

within

the

following

specified

values:

Specifications:

Take-up:

35~70g-cm

(0.49~0.970

oz-inch)

Supply:

2.5~6.0g-cm

(0.035~0.083

oz-inch)

F.F,/REW:

70~160g-cm

(0.970~2.22

02-inch)

4-4

LUBRICATION

Lubrication

is

only

required

when

parts

are

replaced.

For

this

pur-

pose,

use

the

oil

specified

below.

Oil:

TEAC

spindle

oil

(from

TEAC

TZ-255

oil

kit),

Mobil

D.T.E.

Oil

Light,

or

equivalent

Apply

a

drop

of

oi!

with

an

oil

applicator

to

a

point

about

1/3

the

way

down

the

shaft

(from

the

free

end)

of

the

flywheel,

then

insert

the

shaft

into

the

capstan

housing.

‘

Capstan

shaft

|

apply

a

drop

of

oil

here

Capstan

flywheel

ass’y

Capstan

housing

Fig.

4-2

45

VOLTAGE

CONVERSION

(General

Export

Models

only)

1.

ALWAYS

DISCONNECT

THE

POWER

LINE

CORD

BEFORE

MAKING

THESE

ADJUSTMENTS!

r.

2.

Locate

the

voltage

selector

on

the

rear

panel.

3.

Using

a

regular

screwdriver,

turn

the

selector

until

the

numerals

Corresponding

to

the

voltage

requirements

of

your

area

appear.

Rear

View

-

120/220/240V

Fig.

4-3

w-470

5

ELECTRICAL

ADJUSTMENT

AND

CHECKS

PRECAUTIONS

1.

Before

performing

adjustments

and

checks

clean

and

demag-

‘netize

the

entire

tape

path.

2.

Make

sure

the

deck

is

properly

set

for

the

voltage

in

your

locality.

j

3.

In

general,

adjustments

and

checks

are

made

in

the

order

of

L-ch

then

R-ch.

Bouble

REF.

Nos.

and

test

point

designations

indicate

L-ch/R-ch.

(Example:

R11/R21)

4,

OB

is

referenced

to

0.775

V.

Ifan

AC

voltmeter

that

references

0

dB

to

1

V

is

used,

appropriate

compensation

should

be

made.

Oscillator

Distortion

Analyzer

Attenuator

LINE

IN

OUTPUT

.

The

AC

voltmeter

used

in

the

procedures

must

have

an

input

impedance

of

1

M-ohmes

or

more.

.

Note

the

“Deck

settings”

at

the

top

of

each

chart.

The

settings

apply

to

all

check

for

a

specific

chart

unless

explicitly

stated

otherwise.

.

Since

this

deck

has

an

automatic

tape

selector,

be

sure

to

use

test

tapes

that

have

tape

position

detecting

holes.

Oscilloscope

AC

Voltmeter

1kHz

Filter

Fig.

5-1

Basic

test

setup

Oscilloscope

DECK

under

TEST

OUTPUT

AC

Voltmeter

Fig.

5-2

Test

setup

for

azimuth

check

Azimuth

Fixed

adjusting

screw

Fig.

5-4

Azimuch

screw

location

O°

(IN

PHASE)

45°

90°

180°

&)

AS

Fig.

5-3

Confirming

phase

relationship

AC

Voltmeter

Frequency

Counter

T.P

on

Main

PCB

DECK

under

TEST

Fig.

5-5

Test

setup

for

bias

adjustment

5-2

PLAYBACK

PERFORMANCE

‘TEAC

test

tapes:

MIT-150C:

For

Doiby

level

calibration

MIT-256:

For

playback

frequency

response

check

for

NORMAL

Deck

settings:

MIT-356:

For

METAL

and

Cr02

DOLBY

NR

sw:

OUT

MIT-5511:

For

S/N

check

with

NORMAL

ADJUST

MEASURING

INPUT

SIGNAL

|

(or

CHECK)

POINT:

RESULT

MIT-150C

CHECK

OUTPUT:

;

Refer

to

Phase:

within

45°

|

Fig.

5-3

Connection:

Fig.

5-1

2.

Specified

{

output

level

-3cB

£

1

B

Connection:

Fig.

5-1

|

MIT-150C

(489

to

615

nV)

OUIPUT:Fig.

5-7

OUIPUT:Fig.

5-7

output

level

-3

B

to

noise

noise

ratio

S/N

Eom)

Re

er

Boe

ae

eee

eee

te

eee

e4

ee

eae

ee

eee

w-470

5-3

MONITOR

Peck

settings!

5.Min.

input:

level

settings:

RECORD-PAUSE

mode

DOLBY

NR

sw:

OUT

6.Specified

LINE

input

level

7.

Headphone

output

level

Connection:Fig.

5-6

5-4

RECORDING

PERFORMANCE

9.

Record

bias

10.Record

level

11.Frequency

response

12.Signal—-to-

noise

ratio

Deck

settings:

DOLBY

NR

sw:

OUT

RECORDING

LEVEL

cont.

(L/R):

Specified

position

(item

5)

Connection?

Fig.

5-5

Tape

:MIT-5511

LINE

IN:

RECORD/PAUSE

mode

No

signal

LINE

IN:

400

Hz

&

10

kHz

Tape:

MIT-5511

alternately/

RECORD/PLAY

mode

-42cB

(6.15mV)

Record

and

reproduce

then.

Tape:

MIT-5511

400

Hz/-12

cB

(195mV)

Record

and

reproduce

them.

Tape:

MIT-5561

Tape:

MIT-5571

NR

SYSTEM:

IN

&

OUT

LINE

IN:

MIC

min.

input

level

LINE

nin.

input

level

TEAC

recording

test

tapes:

MIT-5571:

For

METAL

MIT-5561:

For

Cr02

MIT-5511:

For

NORMAL

T.P

LAR

(BIAS)

100

kHz

on

Specified

frequency

counter

bias

frequency

OUTPUT:

Nearly

equal

level

Repeat

if

the

at

both

result

is

frequencies

unsatisfactory

OUTPUT:

6Bt15B

(327

nV

to

461

nV)

Tape:

MIT-5511

Tape:

MIT-5561

Tape:

MIT-5571

Tape:

MIT-5571

Tape:

MIT-5561

Tape:

MIT-5511

Required

frequencies:

-42

cB

G.15m¥)

no

signal

Standard:

Fig.5-8

to

Fig.5-9

If

out

of

spec.

-

recheck

#

9

Ratio.

of

specified

output

level:

-3

B

to

noise

|

aos

Waren

ar

OE

RPE

Sa

rene

rae

w-470

AC

Voltmeter

DECK

under

TEST

Test

Load

Resistors

Fig.

5-6

Test

setup

for

headhone

check

5-5

FREQUENCY

RESPONSE

55-1

PLAYBACK

+h)

+

+2

Tape:

MTT-256

(NORMAL)

0

0

-2

ee

2

(d8]

63

35

1OK{Hz}

Fig.

5-7

Playback

frequency

response

55-2

OVERALL

+6

+6

+3

Tape:

MTT-5511

(NORMAL)

0

0

Tape:

MTT-5561

(CrO,)

Tape:

MTT-5571

(METAL)

~3

~§

-6

148)

t

1

}

63

400

10K

{Ha}

Fig.

5-8

Overall

frequency

response

(Dolby

NR:

IN)

+6

+6

+3

0

~

0

-3

-6

-6

{48}

Me

el

63

315

VOKIHz}

Fig.

5-9

Overall!

frequency

response

(Dubbing:

Low/High

speed)

10

PARTS

LIST

SECTION

NOTES:

1.

As

regards

the

resistors

and

capacitors,

refer

to

the

circuit

diagrams

and

the

PCB

ass’y

drawings

included

in

this.

brochure.

2.

parts

marked

with

A\

this

sign

are

safety

critical

components.

They

must

always

be

replaced

with

identical

components

-

refer

_to

the

appropriate

parts

list

and

ensure

exact

replacement.