Teac CX-270 Manual de usuario

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TEAC.

SERVICE

MANUAL

Hay

—€X&270/CX-210

Stereo

Cassette

Deck

CONTENTS

1

Specifications

and

service

data...

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Mechanical

adjustments

and

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Electrical

adjustments

and

checks

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11

8

Lubrication

and

voltage

conversion

2...

0...

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12

9

Exploded

views

and

parts

list...

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Effective:

May,

1979

B90013

5704000600

CX-270/C€X-210

1

SPECIFICATIONS

AND

SERVICE

DATA

SPECIFICATIONS

Track

System

4-track,

2-channel

stereo

2

Heads

Erase,

Record/Playback

Type

of

Tape

Cassete

tape,

C-60

and

C-90

(Philips

type)

Tape

Speed

4.8

cm/s

(1-7/8

ips)

Input

(level

and

impedance)

MIC:

Specified

input

level;

—57dB

(1.09mV)/10kohms

Min.

input

level;

—67dB

(346yV)

LINEIN:

Specified

input

level;

-9dB

(275mV)/50kohms

Min.

input

level;

—19dB

(86.9mV)

DIN*:

Min.

input

tevel;

—35dB

(13.8mV)

Outputs

(level

and

load

impedance)

OUTPUT:

Specified

output

level;

—5dB

(436mV)/S0kohms

Headphones:

Specified

output

level;

—18dB

(97.5mV)/8ohms

Equalization

CO(CrO2):

3180us

+

70us

NORMAL:

3180us

+

120us

Head

Configuration

1/2-track,

1-channel

Erase

Head

1/4-track,

2-channel

record/playback

head

Motor

FG

servo

controlled

DC

motor

Bias

Frequency.

100kHz

Operation

Position

_Horizontal

Power

Requirements

100/117/220/240V

AC,

50/60Hz,

15W,

13W

for

CX-210

(General

Export

Model)

117V

AC,

6OHz,

15W,

13W

for

CX-210

(U.S.A./Canada

Model)

220V

AC,

50Hz,

15W,

13W

for

CX-210

(Europe

Model)

240V

AC,

50Hz,

15W,

13W

for

CX-210

(U.K./Australia

Model)

Weight

6.0kg

(13.2

Ibs.)

net

*

Pursuant

to

DIN

standards

2

295mm

(11-5/8"')

|

410mm

(16-1/8”)

TA-!015

Fig.

1-1

Dimensions

SERVICE

DATA

MECHANICAL

Tape

Speed

Deviation

3,000Hz

+

45Hz

Tape

Speed

Drift

45Hz

Wow

and

Flutter

Playback:

0.10%

(WRMS)

Record/Playback:

0.25%

(RMS)

Pinch

Roller

Pressure

350g

to

450g

(12.302.

to

15.902.)

Reel

Torque

Take-up:

45

to

60

g-cm

(0.6

to

0.8

oz-inch)

Supply:

2

to

6

g-cm

(0.03

to

0.08

02-inch)

Fast

Forward:

100

to

150

g-cm

(1.4

to

2.1

oz-inch)

Rewind:

100

to

150

g-cm

(1.4

to

2.1

02-inch)

Fast

Wind

Time

90

seconds

for

MTT-501

(C-60)

ELECTRICAL

Frequency

Response

Playback

Reference

315Hz:

40Hz:

+2,—4dB

AkHz:

+4,—2dB

63Hz:

+2,—2dB

6.3kHz:

+4,

—2dB

2kHz:

+2,

-2dB

10kHz:

+4,

—5dB

Overall

Reference

400Hz:

40Hz:

+4,-—4dB

6.3kHz:

+2,

—2dB

63Hz:

+4,—4dB

8kHz:

+3,

—3dB

125Hz:

+4,—2dB

10kHz:

+3,

—4dB

(NORMAL)

250Hz:

+2,—2dB

12.5kHz:

+3,

—4dB

(Co(CrO,))

Signal

to

Noise

Ratio

Playback

method:

NORMAL

tape;

47dB

(min.)

Record/Playback

method:

Co(CrO,)

tape;

45dB

(min.)

NORMAL

tape;

44dB

(min.)

S/N

is

improved

by

5dB

at

1kHz

and

10dB

above

5kHz

when

Dolby

NR

used.

Erase

Efficiency

65dB

min.

Channel

Separation

30dB

min.

(at

1kHz)

Crosstalk

Between

Adjasent

Tracks

40dB

min.

(at

125Hz)

Total

Harmonic

Distortion

2.2%

or

less

w/Co(Cr0,)

2.0%

or

less

w/NORMAL

NOTES:

e

tmprovements

may

result

in

Specifications

and

Service

Data

changes.

e

Value

of

“dB”

in

the

Data

refers

to

OdB

(0.775V),

except

where

specified.

e

The

f-210

is

Japan

Domestic

model

of

the

CX-210.

Noise

reduction

circuit

made

under

license

from

Dolby

Laborato-

ties.

The

word

“Dolby”and

the

Double-D

symbol!

are

tradmarks

of

Dolby

Laboratories.

TOS

270/K210

|

2

PARTS

LOCATION

(CX-270)

VOLTAGE

SELECTOR

PCB

Ass’y

REC/PLAY

AMPL

PCB

Ass‘’y

(for

General

Export

Models)

TA-

016

DC

Motor

Ass’y

METER

PCB

Ass’y

Fig.

2-1

Cassette

Holder

Ass’y

Supply

Take-up

Reel

Table

Ass’y

Reel

Table

Ass’y

FL

Peak

Level

Meter

Erase

Head

REC/PLAY

Head

Pinch

Roller

Ass’y

|

Counter

Ass’y

~

UBSIONE

CX-270/CX-210

3

CASE

AND

FRONT

PANEL

REMOVAL

Disassemble

in

number-order

Fig.

3-1

€X-270/CX-210

|

4

MECHANICAL

ADJUSTMENTS

AND

CHECKS

:

4-1

TEST

EQUIPMENT

4-2

CAPSTAN

ASSEMBLY

THRUST

|

NOTE:

When

ordering

special

tapes

indicated

by*,

allow

for

the

1.

Adjust

the

thrust

adjusting

screw

so

that

thrust

of

the

capstan

|

longer

delivery

time

that

is

required

for

them.

shaft

is

limited

to

spec.

|

1.

Spring

scale:

For

pinch

roller

pressure

check,

0

to

Specification:

—

0.05mm

to

0.10mm

1

500g

(17.602z.)

T

|

2.

Wow/flutter

meter:

|

3.

Frequency

counter:

Digital

type,

capable

of

10Hz

to

100

i

kHz

indication

Thrust

|

4.

Cleaner:

TEAC

1TZ-261

tape

recorder

cleaner

adjusting

kit

or

pure

alcohol

ree

5.

Test

tape*:

TEAC

MTT-111

(for

tape

speed

and

wow/flutter

test,

3,000Hz

is

recorded)

6.

Cassette

torque

meter*:

For

take-up

and

supply

torque

checks,

0

to

100

g-cm

(0

to

1.4

oz-inch)

-For

fast

forward

and

rewind

torque

checks,

0

to

160

g-cm

(0

to

2.2

oz-inch)

7.

Compact

Cassette

MTT-901;

C-60,

30m

Tape

Path

Checker*:

MTT-902;

C-90,

45m

Thrust

play

{I

0.05mm

to

0.10mm

TA-I0!19

4-3

TAPE

SPEED

1.

Load

and

play

a

TEAC

MTT-111

test

tape.

2.

Using

a

common

slotted

screwdriver

with

a

handle

completely

insulated

from

the

screwdriver

blade,

adjust

the

control

on

the

motor

for

a

reading

of

2,995Hz

to

3,005Hz.

3.

Check

the

followings

at

the

begining

and

the

end

of

the

tape.

Specifications:

Pe

See

Se

RTTE

Tape

speed

deviation.

..

3,000Hz

+

45Hz

ig.

4-

a

g

assette

torque

me

Tape

speed

drift

.....

45Hz

4.

If

the

tape

speed

is

out

of

spec.,

check

the

pinch

roller

pressure

and

the

tape

driving

function

for

correctness,

and

check

that

the

tape

path

is

clean.

Frequency

Counter

Fig.

4-2.

Compact

cassette

tape

path

checker

TEAC

Tz-261

‘COROER

~

ANER

Fig.

4-3

TZ-261

Tape

recorder

cleaner

kit

Internal

Adjustment

TA-1020

for

Tape

Speed

Fig.

4-6

Tape

speed

adjustment

location

CX-270/CX-210

5-1

GENERAL

NOTICE

1.

5-2

TEST

EQUIPMENT

NOTE:

When

ordering

test

tapes,

allow

for

the

longer

delivery

time

11.

12.

13.

.

Check

that

the

deck

is

properly

set

for

the

voltage

in

your

lo-

.

In

general,

adjustments

and

checks

are

done

in

the

order

of

L-ch

.

The

AC

voltmeter

used

in

the

procedures

must

have

an

input

.

TEAC

test

tapes

ON

MAR

WL

5

ELECTRICAL

ADJUSTMENTS

AND

CHECKS

Before

performing

adjustments

and

checks,

clean

and

demagne-

tize

the

entire

tape

path.

cality.

then

R-ch.

Double

REF.

Nos.

indicate

L-ch/R-ch.

(Example:

R11/R21)

The

value

of

“dB”

refers

to

OdB

(0.775V).

If

an

AC

voltmeter

calibrated

to

OdB

(1V)

is

to

be

used,

appropriate

compensation

should

be

made.

impedance

of

1

M-ohms

or

more.

required

for

them.

MTT-150:

For

Duolby

tevel

calibration

’

MTT-316:

For

playback

frequency

response

check

for

EQ

—

Co

(CrO.)

MTT-216:

For

playback

response

check

for

EQ

-

NORMAL

:

MTT-506

or

similar:

For

record

test

with

BIAS/EQ,

Co

(Cr0,)

Fidt

2

EAC

tom

tapes

MTT-501

or

similar:

For

record

test

with

BIAS/EQ,

NORMAL

.

AF

oscillator:

10Hz

to

100kHz

5-3

PREPARATIONS

.

AC

voltmeter:

0.1mV

to

300V

.

DC

voltmeter

otherwise

in

the

procedures,

1kHz

filter

should

be

bypassed.

|

switch

|

Position

Attenuator:

General

purpose

Distortion

analyzer:

Basic

frequency

400Hz/1kHz

Oscilloscope:

General

purpose

BIAS

Co

(Cr0,)

Band-pass

filter:

1kHz

narrow

band-pass

type

EO

Co

(Cr0,)

Test

load

resistor:

Non

inductive

type

8

ohm/1W

DOLBY

NR

OUT

Plastic

alignment

tool

Head

demagnetizer:

TEAC

E-3

or

equivalent

Cleaner:

TEAC

TZ-261

or

pure

alcohol

Bulk

tape

eraser:

TEAC

E-2

or

equivalent

INPUT

LINE

OSCILLOSCOPE

OSCILLATOR

DISTORTION

ANALYZER

AMP

SPKR

°

@O@O@

OOO,

AC

Voltmeter

IkHz

FILTER

$2

ATTENUATOR

0

T-1772

OUTPUT

Fig.

5-3

Basic

test

setup

1.

Make

the

basic

test

set-up

and

the

switch

setting.

Unless

showed

ge

CX-270/CX-210

5-4

PLAYBACK

PERFORMANCE

SIGNAL

ADJUST

CONNECTION

SOURCE

(or

CHECK)

OUTPUT

REMARKS

Phase:

within

45°

on

1,

REC/PLAY

head

Yee

ot

ee

ee

Ne

a, 12

sl

Ree

ORE

NE

Brean

||

: :

:

i

azimuth

MTT-316

tape,

Azimuth

adj.

|

tax,

output

on

AC

}

MTT-150

tape

Check

f

10kHz

section

oso”

voltmeter

Connect

AC

volt-

:

meter

between

2.

Specified

out-

DOLBY

TP

L

(R)

put

level

and

TP

E

MTT-150

tape

R11/R21

580

mV

(—2.5

dB)

—5dB+2qdB

e

Specified

level

(346

mV

to

548

mV)

e

Set

PEAK

HOLD

to

|

;

CANCEL

for

CX-270

|

t

3.

VU

meter

+3

VUonVUmeter.....

(Peak

level

meter)

MTT-150

tape

R13/R23

or

O

dB

on

peak

fevel

rae

ey

Pieter

weeue:

eate

tay

i

Reference

315Hz:

40Hz:

+2,—4dB

4.

Frequency

MTT-316

tape,

63Hz:

+2,-2dB

©

If

10kHz

output

is

low,

:

response

40Hz

to

10kHz

2kHz:

+2,—2dB

adjust

by

cutting

jumper

.

section

4kHz:

+4,—2dB

W2

and/or

W2.

(Fig.

5-8).

6.3kHz:

+4,

-—2

dB

10kHz:

+4,—5dB

©

Set

EQ

sw.

to

NORMAL.

MTT-501

tape

47

dB

(min.)

ratio

©

Ratio

of

spec.

—5

dB

and

noise.

5.

Signa!

to

noise

ratio

6.

Headphone

:

-—18

dB

+2dB

@

At

PHONES

jack.

ae

om

is

a

=

(77.5

my

tO

ize

mv)

OSCILLOSCOPE

°

° °

O°

(IN

PHASE)

45

90

180

DECK

OH)

ce

O

<

under

TEST

T-

1493

Fig.

5-6

Confirming

phase

relationship

T-813

Fig.

5-4

Connection

AC

Voltmeter

REC/PLAY

HEAD

DECK

under

TEST

:

PHONES

Fixed

Azimuth

adjusting

nut

TAIODO

T-401«

Fig.5-5

Head

azimuth

adj.

location

Fig.

5-7

Connection

CX-270/CX-210

5-5

MONITOR

PERFORMANCE

(In

the

record-pause

mode)

1.

Min.

input

level

CONNECTION

Fig.

5-3,

but

LINE

IN>MIC

.

Specified

RECORD

cont.

setting

SIGNAL

SOURCE

ADJUST

{or

CHECK)

autre

Test

tone,

400Hz/

—19

dB

+

2

dB

(69

mV

to

109

mV}

Test

tone,

400Hz/

—67

dB

+3

dB

(245

BV

to

489

nV)

RECORD

cont.

to

Max.

and

Check

—5

dB

(436

mV)

REMARKS

©

For

LINE

IN

check

©

For

MIC

check.

©

Set

INPUT

sw.

to

MIC

(or

MIC/DIN)

NOTE:

To

prevent

mis-meas-

urements,

any

connection

cords

except

those

for

each

input

check

must

be

re-

moved.

Connect

OSC>ATT

to

LINE

IN,

and

AC

voltmeter

be--

tween

DOLBY

TP

L(R)

and

TPE

3.

VU

meter

(Peak

level

meter)

Test

tone,

400H2/

—9

dB

(275

mV)

RECORD

580

mV

(—2.5

dB)

cont.

—5dB+1dB

(388

mV

to

489

mV)

5-6

RECORDING

PERFORMANCE

ITEM

CONNECTION

1.

Bias

trap

2.

Record

bias

3.

Record

level

Test

tone,

400Hz/

—9

dB

“|

IMPORTANT:

After

this,

do

not

move

RECORD

cont.

for

all

later

process.

+3

VU+1VU

on VU

O

dB

+

1

dB

on

peak

level

meter

e@

Set

PEAK

HOLD

to

CANCEL

for

CX-270

4.

Distortion

.

Frequency

response

SIGNAL

ADJUST

SOURCE

(or

CHECK)

ONT

REMARKS

Connect

AC

voltme-

}

ter

between

BIAS

A ‘

,

F

TRAP

TP

L(R)

No

signal

L102/L202

Min.

reading

e

Set

in

REC-PAUSE

mode.

and

TP

E

:

Test

tone,

400Hz

Th

e

level

at

Fig.

5-3

and

6.3kHz

in

C136/C236

|

pepe

eee

turn/—42

dB

ot

requencies

R12/R22....—-8dB(308mvV).......

Co

(CrO,)

Fig.

5-3

Test

tone,

400Hz/

|

—8

dB

+

1.5

dB

—12dB

(195

mv)

|

Check.

-----

(259

mV

to

367

mV)"

****

periuaions

mt

Test

tone,

400Hz/

22%orless.....0..0-

Co

(CrO.)

Eigc

BS

—12

dB

(195

mv)

|

Check

2.0%

or

less...

1...

eee

NORMAL

Reference

400Hz:

40Hz:

+4,—4dB

63Hz:

+4,-4dB

Test

tone

required

125Hz:

+4,-—2dB

Fig.

5-3

w/spec./—42

dB

Check

250Hz:

+2,—-2dB

(6.15

mV)

6.3kHz:

+2,

—2dB

8kHz:

+3,—-3

dB

10kHz:

+3,-4dB.....

NORMAL

12.5kHz:

+3,-4dB.....

Co

(CrO,)

6.

Signal

to

noise

ratio

Fig.

5-3

Test

tone,

1kHz/

—9

dB

(275

mv)

then

No

signal

recording

Check

aa

45

dB

(min.)

ratio.

.

.

44

dB

(min.)

ratio.

. .

e

Ratio

of

1kHz

portion

and

no

signal

portion

...

Co

(CrO2)

(X-270/€X-210

|

.

Erase

efficiency

Fig.

5-3,

switch

on

1kHz

filter

Test

tone,

1kHz/

+1

dB

(0.869

V)

then

No

signal

recording

65

dB

(min.)

ratio

®

Co

(CrO2)

only

®@

Record

1kHz.

Rewind

tape

to

mid

point

of

recorded

portion.

Do

no

signal

re-

cording.

Get

difference

be-

tween

1kHz

portion

and

its

erased

portion.

.

Channel

separation

Fig.

5-3,

connect

OSC>ATT

to

LINE

IN

(L)

only,

switch

on

1kHz

filter

Test

tone,

1kHz/

—9

dB

(275

mv)

for

L-ch

and

Check

;

30

dB

(min.)

ratio

®

Co

(CrO2)

only

©

Set

deck

in

record

mode.

Find

differences

between

1kHz

recorded

portion

(L-ch)

and

no

signal

portion

(R-ch).

.

Adjacent

track

cross

talk

Fig.

5-3,

connect

OSC>ATT

to

LINE

IN

(R)

only,

and

AC

voltmeter

to

OUTPUT

(R)

only

No

signal

for

|

Test

tone,

125Hz

—9

dB

(275

mV)

40

dB

(min.)

ratio

®

Co

(CrO.)

only

®

Record

125Hz

on

R-ch.

Note

output

level

of

its

recorded

portion.

Invert

tape

and

play

R-ch

track.

Check

leakage

tevel

against

the

output

ref.

of

previ-

ously

recorded

portion.

10.Doiby

NR

effect

T

TT

Test

tone:

1kHz/

—32

dB

(19.5

mV),

10kHz/—42

dB

(6.15

mV)

5-7

ADJUSTMENT

AND

TEST

POINT

LOCATIONS

=

~

am

Ps

7

q

ee

2%

|

Variation

from

ref.

At

1kHz:

3

dB

to8dB

At

10kHz:

8

dB

to

12

dB

TA-1021

®

Co

(CrO,)

only

@

Record

1kHz

w/DOLBY

NR

sw.

to

OUT.

Play

its

portion

w/DOLBY

NR,

OUT

and

IN.

Get

the

out-

put

level

difference

be-

tween

OUT

and

IN.

©

Repeat

the

above

process

for

10kHz.

CX-270/CX-210

6

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