Teac W-470 Manuel utilisateur

TEAC.

SERVICE

MANUAL

w-470

Stereo

Double

Cassette

Deck

CAUTION

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

are

trademarks

Dolby

Laboratories

Licensing

Corporation.

They

must

always

replaced

with

identical

components—

refer

the

appropriate

parts

list

and

ensure

exact

replacement.

Effective:

JULY,

1989

9103003100

septum

dhsaeniic

}

{

W-470

SPECIFICATIONS

AND

SERVICE

DATA

SPECIFICATIONS

Track

System

4-track,

2-channel

stereo

Heads

Play

Playback

REC/PLAY

Erase

*1,

Record/Playback

Type

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)

(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

Head

Configuration

1/2-track,

1-channel

erase

head

1/4-track,

2-channel

record/playback

head

Motor

PLAYI:

servo

motor,

REC/PLAY

servo

motor

Bias

Frequency

100kHz

Operation

Position

Horizontal

Power

Requirements

120/220/240

AC,50/60Hz

(General

Export

Models)

120

AC,60Hz

(U.S.

A/Canada)

220

AC,50Hz

(Europe)

240

V-AC,50Hz

(U.K./Australia)

100

AC,50Hz

(JAPAN)

Power

Consumption

Weight

4,7kg

(10.36

lbs)

Dimensions

(WHD)

435%1274262mm

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

NOTES:

Improvements

may

result

SPECIFICATIONS

AND

SERVI

DATA

chanfes.

Value

"dB"

the

data

refers

(©.775

V),

expect

where

Specified.

SERVICE

DATA

MECHAN

ICAL

Tape

Speed

Deviation

3,000

+90,-90

Hz,6000

Hz+180,

-180

Tape

Speed

Drift

(LOW

SPEED),90Hz

(HIGH

SPEED)

Yow.

and

Flutter

Playback:

0.30

(WRMS)

Pinch

Roller

Pressure

250

470

(8.80z

16.5

oz)

Reel

Torque

Take-up:

g-cm

(0.49

0.97

02-inch)

Supply:

2.5

e-cm

(0.035

0.083

0Z-inch)

F.F:

160

g-cm

(0.97

2.22

0Z-inch)

REW:

160

g-cm

(0.97

2.22

0Z-inch)

Fast

Wind

Time

125

sec

less

for

MIT-5511

(C-60)

Auto

End-stop

Time

sec.

less

ELECTRICAL

Frequency

Response

See

Figs.

5-7

5-9

Signal-to-noise

Ratio

Playback:

NORMAL:

min.

Record/P

layback

METAL,

Cr02:

min.

NORMAL:

min.

Erase

Efficiency

min.

kHz

(measured

with

input

higher

than

the

specified

input

level).

Channel

Separation

min.

kHz

Adjacent

Track

Crosstalk

40 dB

min.

125

Total

Harmonic

Distortion

2.0

less

with

NORMAL

2.5

less

with

Cr02,METAL

W-470

CASE

AND

FRONT

PANEL

REMOVAL

—

}

eGlis

obs

aes

{

alt

POWER

TRANSFORMER

POWER

PCB

PARTS

LOCATION

PLAY

[

MECH

REC/PLAY

MECH

Fig.

3-1

Top

view

(W-470)

R/P

AMPL

PCB

METER

PCB

W-470

MECHANICAL

ADJUSTMENT

AND

CHECKS

4-1

WOW

AND

FLUTTER

Note:

This

measurement

should

made

the

begining,

middle,

and

the

end

the

tape.

PLAYBACK

Connect

wow-and-flutter

meter

the

deck

shown

Fig.

41.

Load

and

play

TEAC

MTT-111

test

tape.

Check

that

the

reading

the

wow-and-flutter

meter

within

0.38%

(RMS).

4.2

TAPE

SPEED

Connect

frequency

counter

the

deck

shown

Fig.

4-1.

Simply

press

POWER

switch

rotate

the

motor,

then

continue

the

motor

rotation

for

approx.

minute

for

warmp-up.

soon

the

warm-up

finishes,

load

TEAC

MTT-111

test

tape

with

3,000

test

tone

and

play

the

end

the

test

tape.

Adjust

each

variable

resistor

get

the

following

figures.

Short

(SPEED

ADJ)

get

the

double

tape

speed

(HIGH

speed),

Never

press

TAPE

SPEED

switch

HIGH

position.

[Adjustment

point

[Adjustment

value

aye

HIGH

speed

R31

6020

6040

LOW

speed

R32

3010

3020

HIGH

602

REC/PLAY

steed

Litas

LOW

speed

3000

3010

first,

adjust

NORMAL

tape

speed.

play

mode,

check

that

the

following

figures

are

obtained

the

beginning

and

the

end

the

tape.

fot

oan

eel

LOW

speed

HIGH

speed

3000

+90,

—90

[6000

+180,

—180

Speed

drifting

Within

Within90Hz

Frequency

Counter

Oscillator

Wow

Fiutter

Meter

DECK

under

TEST

(R)

LINE

OUTPUT

Fig.

4-1

REEL

TORQUE

Load

the

cassette

torque

meter

the

deck

and

read

the

pointer

indication

the

dial

scale

for

each

tape

transport

operation.

The

measured

torque

should

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

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,

equivalent

Apply

drop

oi!

with

oil

applicator

point

about

1/3

the

way

down

the

shaft

(from

the

free

end)

the

flywheel,

then

insert

the

shaft

into

the

capstan

housing.

‘

Capstan

shaft

apply

drop

oil

here

Capstan

flywheel

ass’y

Capstan

housing

Fig.

4-2

VOLTAGE

CONVERSION

(General

Export

Models

only)

ALWAYS

DISCONNECT

THE

POWER

LINE

CORD

BEFORE

MAKING

THESE

ADJUSTMENTS!

Locate

the

voltage

selector

the

rear

panel.

Using

regular

screwdriver,

turn

the

selector

until

the

numerals

Corresponding

the

voltage

requirements

your

area

appear.

Rear

View

120/220/240V

Fig.

4-3

w-470

ELECTRICAL

ADJUSTMENT

AND

CHECKS

PRECAUTIONS

Before

performing

adjustments

and

checks

clean

and

demag-

‘netize

the

entire

tape

path.

Make

sure

the

deck

properly

set

for

the

voltage

your

locality.

general,

adjustments

and

checks

are

made

the

order

L-ch

then

R-ch.

Bouble

REF.

Nos.

and

test

point

designations

indicate

L-ch/R-ch.

(Example:

R11/R21)

referenced

0.775

Ifan

voltmeter

that

references

used,

appropriate

compensation

should

made.

Oscillator

Distortion

Analyzer

Attenuator

LINE

OUTPUT

The

voltmeter

used

the

procedures

must

have

input

impedance

M-ohmes

more.

Note

the

“Deck

settings”

the

top

each

chart.

The

settings

apply

all

check

for

specific

chart

unless

explicitly

stated

otherwise.

Since

this

deck

has

automatic

tape

selector,

sure

use

test

tapes

that

have

tape

position

detecting

holes.

Oscilloscope

Voltmeter

1kHz

Filter

Fig.

5-1

Basic

test

setup

Oscilloscope

DECK

under

TEST

OUTPUT

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°

Fig.

5-3

Confirming

phase

relationship

Voltmeter

Frequency

Counter

T.P

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

sw:

OUT

MIT-5511:

For

S/N

check

with

NORMAL

ADJUST

MEASURING

INPUT

SIGNAL

(or

CHECK)

POINT:

RESULT

MIT-150C

CHECK

OUTPUT:

;

Refer

Phase:

within

45°

Fig.

5-3

Connection:

Fig.

5-1

Specified

{

output

level

-3cB

Connection:

Fig.

5-1

MIT-150C

(489

615

nV)

OUIPUT:Fig.

5-7

OUIPUT:Fig.

5-7

output

level

-3

noise

ratio

S/N

Eom)

Boe

eee

eae

eee

w-470

5-3

MONITOR

Peck

settings!

5.Min.

input:

level

settings:

RECORD-PAUSE

mode

DOLBY

sw:

OUT

6.Specified

LINE

input

level

Headphone

output

level

Connection:Fig.

5-6

5-4

RECORDING

PERFORMANCE

Record

bias

10.Record

level

11.Frequency

response

12.Signal—-to-

noise

ratio

Deck

settings:

DOLBY

sw:

OUT

RECORDING

LEVEL

cont.

(L/R):

Specified

position

(item

Connection?

Fig.

5-5

Tape

:MIT-5511

LINE

IN:

RECORD/PAUSE

mode

signal

LINE

IN:

400

kHz

Tape:

MIT-5511

alternately/

RECORD/PLAY

mode

-42cB

(6.15mV)

Record

and

reproduce

then.

Tape:

MIT-5511

400

Hz/-12

(195mV)

Record

and

reproduce

them.

Tape:

MIT-5561

Tape:

MIT-5571

SYSTEM:

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

Specified

frequency

counter

bias

frequency

OUTPUT:

Nearly

equal

level

Repeat

the

both

result

frequencies

unsatisfactory

OUTPUT:

6Bt15B

(327

461

nV)

Tape:

MIT-5511

Tape:

MIT-5561

Tape:

MIT-5571

Tape:

MIT-5571

Tape:

MIT-5561

Tape:

MIT-5511

Required

frequencies:

-42

G.15m¥)

signal

Standard:

Fig.5-8

Fig.5-9

out

spec.

recheck

Ratio.

specified

output

level:

-3

noise

aos

Waren

RPE

rene

rae

w-470

Voltmeter

DECK

under

TEST

Test

Load

Resistors

Fig.

5-6

Test

setup

for

headhone

check

5-5

FREQUENCY

RESPONSE

55-1

PLAYBACK

+h)

Tape:

MTT-256

(NORMAL)

-2

(d8]

1OK{Hz}

Fig.

5-7

Playback

frequency

response

55-2

OVERALL

Tape:

MTT-5511

(NORMAL)

Tape:

MTT-5561

(CrO,)

Tape:

MTT-5571

(METAL)

~§

-6

148)

}

400

10K

{Ha}

Fig.

5-8

Overall

frequency

response

(Dolby

NR:

IN)

-3

-6

{48}

315

VOKIHz}

Fig.

5-9

Overall!

frequency

response

(Dubbing:

Low/High

speed)

PARTS

LIST

SECTION

NOTES:

regards

the

resistors

and

capacitors,

refer

the

circuit

diagrams

and

the

PCB

ass’y

drawings

included

this.

brochure.

parts

marked

with

this

sign

are

safety

critical

components.

They

must

always

replaced

with

identical

components

refer

_to

the

appropriate

parts

list

and

ensure

exact

replacement.

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