Teac CX-270 Bedienungsanleitung

TEAC.

SERVICE

MANUAL

Hay

—€X&270/CX-210

Stereo

Cassette

Deck

CONTENTS

Specifications

and

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Effective:

May,

1979

B90013

5704000600

CX-270/C€X-210

SPECIFICATIONS

AND

SERVICE

DATA

SPECIFICATIONS

Track

System

4-track,

2-channel

stereo

Heads

Erase,

Record/Playback

Type

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

servo

controlled

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

DIN

standards

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

450g

(12.302.

15.902.)

Reel

Torque

Take-up:

g-cm

(0.6

0.8

oz-inch)

Supply:

g-cm

(0.03

0.08

02-inch)

Fast

Forward:

100

150

g-cm

(1.4

2.1

oz-inch)

Rewind:

100

150

g-cm

(1.4

2.1

02-inch)

Fast

Wind

Time

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

Noise

Ratio

Playback

method:

NORMAL

tape;

47dB

(min.)

Record/Playback

method:

Co(CrO,)

tape;

45dB

(min.)

NORMAL

tape;

44dB

(min.)

S/N

improved

5dB

1kHz

and

10dB

above

5kHz

when

Dolby

used.

Erase

Efficiency

65dB

min.

Channel

Separation

30dB

min.

(at

1kHz)

Crosstalk

Between

Adjasent

Tracks

40dB

min.

(at

125Hz)

Total

Harmonic

Distortion

2.2%

less

w/Co(Cr0,)

2.0%

less

w/NORMAL

NOTES:

tmprovements

may

result

Specifications

and

Service

Data

changes.

Value

“dB”

the

Data

refers

OdB

(0.775V),

except

where

specified.

The

f-210

Japan

Domestic

model

the

CX-210.

Noise

reduction

circuit

made

under

license

from

Dolby

Laborato-

ties.

The

word

“Dolby”and

the

Double-D

symbol!

are

tradmarks

Dolby

Laboratories.

TOS

270/K210

PARTS

LOCATION

(CX-270)

VOLTAGE

SELECTOR

PCB

Ass’y

REC/PLAY

AMPL

PCB

Ass‘’y

(for

General

Export

Models)

TA-

016

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

Peak

Level

Meter

Erase

Head

REC/PLAY

Head

Pinch

Roller

Ass’y

Counter

Ass’y

UBSIONE

CX-270/CX-210

CASE

AND

FRONT

PANEL

REMOVAL

Disassemble

number-order

Fig.

3-1

€X-270/CX-210

MECHANICAL

ADJUSTMENTS

AND

CHECKS

4-1

TEST

EQUIPMENT

4-2

CAPSTAN

ASSEMBLY

THRUST

NOTE:

When

ordering

special

tapes

indicated

by*,

allow

for

the

Adjust

the

thrust

adjusting

screw

that

thrust

the

capstan

longer

delivery

time

that

required

for

them.

shaft

limited

spec.

Spring

scale:

For

pinch

roller

pressure

check,

Specification:

—

0.05mm

0.10mm

500g

(17.602z.)

Wow/flutter

meter:

Frequency

counter:

Digital

type,

capable

10Hz

100

kHz

indication

Thrust

Cleaner:

TEAC

1TZ-261

tape

recorder

cleaner

adjusting

kit

pure

alcohol

ree

Test

tape*:

TEAC

MTT-111

(for

tape

speed

and

wow/flutter

test,

3,000Hz

recorded)

Cassette

torque

meter*:

For

take-up

and

supply

torque

checks,

100

g-cm

1.4

oz-inch)

-For

fast

forward

and

rewind

torque

checks,

160

g-cm

2.2

oz-inch)

Compact

Cassette

MTT-901;

C-60,

30m

Tape

Path

Checker*:

MTT-902;

C-90,

45m

Thrust

play

0.05mm

0.10mm

TA-I0!19

4-3

TAPE

SPEED

Load

and

play

TEAC

MTT-111

test

tape.

Using

common

slotted

screwdriver

with

handle

completely

insulated

from

the

screwdriver

blade,

adjust

the

control

the

motor

for

reading

2,995Hz

3,005Hz.

Check

the

followings

the

begining

and

the

end

the

tape.

Specifications:

See

RTTE

Tape

speed

deviation.

3,000Hz

45Hz

ig.

assette

torque

Tape

speed

drift

.....

45Hz

the

tape

speed

out

spec.,

check

the

pinch

roller

pressure

and

the

tape

driving

function

for

correctness,

and

check

that

the

tape

path

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

5-2

TEST

EQUIPMENT

NOTE:

When

ordering

test

tapes,

allow

for

the

longer

delivery

time

11.

12.

13.

Check

that

the

deck

properly

set

for

the

voltage

your

lo-

general,

adjustments

and

checks

are

done

the

order

L-ch

The

voltmeter

used

the

procedures

must

have

input

TEAC

test

tapes

MAR

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

“dB”

refers

OdB

(0.775V).

voltmeter

calibrated

OdB

(1V)

used,

appropriate

compensation

should

made.

impedance

M-ohms

more.

required

for

them.

MTT-150:

For

Duolby

tevel

calibration

’

MTT-316:

For

playback

frequency

response

check

for

—

(CrO.)

MTT-216:

For

playback

response

check

for

NORMAL

MTT-506

similar:

For

record

test

with

BIAS/EQ,

(Cr0,)

Fidt

EAC

tom

tapes

MTT-501

similar:

For

record

test

with

BIAS/EQ,

NORMAL

oscillator:

10Hz

100kHz

5-3

PREPARATIONS

voltmeter:

0.1mV

300V

voltmeter

otherwise

the

procedures,

1kHz

filter

should

bypassed.

switch

Position

Attenuator:

General

purpose

Distortion

analyzer:

Basic

frequency

400Hz/1kHz

Oscilloscope:

General

purpose

BIAS

(Cr0,)

Band-pass

filter:

1kHz

narrow

band-pass

type

(Cr0,)

Test

load

resistor:

Non

inductive

type

ohm/1W

DOLBY

OUT

Plastic

alignment

tool

Head

demagnetizer:

TEAC

E-3

equivalent

Cleaner:

TEAC

TZ-261

pure

alcohol

Bulk

tape

eraser:

TEAC

E-2

equivalent

INPUT

LINE

OSCILLOSCOPE

OSCILLATOR

DISTORTION

ANALYZER

AMP

SPKR

@O@O@

OOO,

Voltmeter

IkHz

FILTER

ATTENUATOR

T-1772

OUTPUT

Fig.

5-3

Basic

test

setup

Make

the

basic

test

set-up

and

the

switch

setting.

Unless

showed

CX-270/CX-210

5-4

PLAYBACK

PERFORMANCE

SIGNAL

ADJUST

CONNECTION

SOURCE

(or

CHECK)

OUTPUT

REMARKS

Phase:

within

45°

REC/PLAY

head

Yee

a, 12

Ree

ORE

Brean

: :

azimuth

MTT-316

tape,

Azimuth

adj.

tax,

output

}

MTT-150

tape

Check

10kHz

section

oso”

voltmeter

Connect

volt-

meter

between

Specified

out-

DOLBY

(R)

put

level

and

MTT-150

tape

R11/R21

580

(—2.5

dB)

—5dB+2qdB

Specified

level

(346

548

mV)

Set

PEAK

HOLD

;

CANCEL

for

CX-270

meter

VUonVUmeter.....

(Peak

level

meter)

MTT-150

tape

R13/R23

peak

fevel

rae

Pieter

weeue:

eate

tay

Reference

315Hz:

40Hz:

+2,—4dB

Frequency

MTT-316

tape,

63Hz:

+2,-2dB

10kHz

output

low,

response

40Hz

10kHz

2kHz:

+2,—2dB

adjust

cutting

jumper

section

4kHz:

+4,—2dB

and/or

W2.

(Fig.

5-8).

6.3kHz:

+4,

-—2

10kHz:

+4,—5dB

Set

sw.

NORMAL.

MTT-501

tape

(min.)

ratio

Ratio

spec.

—5

and

noise.

Signa!

noise

ratio

Headphone

-—18

+2dB

PHONES

jack.

(77.5

ize

mv)

OSCILLOSCOPE

° °

O°

(IN

PHASE)

180

DECK

OH)

under

TEST

T-

1493

Fig.

5-6

Confirming

phase

relationship

T-813

Fig.

5-4

Connection

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)

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

(69

109

mV}

Test

tone,

400Hz/

—67

(245

489

nV)

RECORD

cont.

Max.

and

Check

—5

(436

mV)

REMARKS

For

LINE

check

For

MIC

check.

Set

INPUT

sw.

MIC

(or

MIC/DIN)

NOTE:

prevent

mis-meas-

urements,

any

connection

cords

except

those

for

each

input

check

must

re-

moved.

Connect

OSC>ATT

LINE

IN,

and

voltmeter

be--

tween

DOLBY

L(R)

and

TPE

meter

(Peak

level

meter)

Test

tone,

400H2/

—9

(275

mV)

RECORD

580

(—2.5

dB)

cont.

—5dB+1dB

(388

489

mV)

5-6

RECORDING

PERFORMANCE

ITEM

CONNECTION

Bias

trap

Record

bias

Record

level

Test

tone,

400Hz/

—9

“|

IMPORTANT:

After

this,

not

move

RECORD

cont.

for

all

later

process.

VU+1VU

on VU

peak

level

meter

Set

PEAK

HOLD

CANCEL

for

CX-270

Distortion

Frequency

response

SIGNAL

ADJUST

SOURCE

(or

CHECK)

ONT

REMARKS

Connect

voltme-

}

ter

between

BIAS

A ‘

TRAP

L(R)

signal

L102/L202

Min.

reading

Set

REC-PAUSE

mode.

and

Test

tone,

400Hz

level

Fig.

5-3

and

6.3kHz

C136/C236

pepe

eee

turn/—42

requencies

R12/R22....—-8dB(308mvV).......

(CrO,)

Fig.

5-3

Test

tone,

400Hz/

—8

1.5

—12dB

(195

mv)

Check.

-----

(259

367

mV)"

****

periuaions

Test

tone,

400Hz/

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

(CrO.)

Eigc

—12

(195

mv)

Check

2.0%

less...

1...

eee

NORMAL

Reference

400Hz:

40Hz:

+4,—4dB

63Hz:

+4,-4dB

Test

tone

required

125Hz:

+4,-—2dB

Fig.

5-3

w/spec./—42

Check

250Hz:

+2,—-2dB

(6.15

mV)

6.3kHz:

+2,

—2dB

8kHz:

+3,—-3

10kHz:

+3,-4dB.....

NORMAL

12.5kHz:

+3,-4dB.....

(CrO,)

Signal

noise

ratio

Fig.

5-3

Test

tone,

1kHz/

—9

(275

mv)

then

signal

recording

Check

(min.)

ratio.

(min.)

ratio.

. .

Ratio

1kHz

portion

and

signal

portion

...

(CrO2)

(X-270/€X-210

Erase

efficiency

Fig.

5-3,

switch

1kHz

filter

Test

tone,

1kHz/

(0.869

then

signal

recording

(min.)

ratio

(CrO2)

only

®@

Record

1kHz.

Rewind

tape

mid

point

recorded

portion.

signal

re-

cording.

Get

difference

be-

tween

1kHz

portion

and

its

erased

portion.

Channel

separation

Fig.

5-3,

connect

OSC>ATT

LINE

(L)

only,

switch

1kHz

filter

Test

tone,

1kHz/

—9

(275

mv)

for

L-ch

and

Check

;

(min.)

ratio

(CrO2)

only

Set

deck

record

mode.

Find

differences

between

1kHz

recorded

portion

(L-ch)

and

signal

portion

(R-ch).

Adjacent

track

cross

talk

Fig.

5-3,

connect

OSC>ATT

LINE

(R)

only,

and

voltmeter

OUTPUT

(R)

only

signal

for

Test

tone,

125Hz

—9

(275

mV)

(min.)

ratio

(CrO.)

only

Record

125Hz

R-ch.

Note

output

level

its

recorded

portion.

Invert

tape

and

play

R-ch

track.

Check

leakage

tevel

against

the

output

ref.

previ-

ously

recorded

portion.

10.Doiby

effect

Test

tone:

1kHz/

—32

(19.5

mV),

10kHz/—42

(6.15

mV)

5-7

ADJUSTMENT

AND

TEST

POINT

LOCATIONS

Variation

from

ref.

1kHz:

to8dB

10kHz:

TA-1021

(CrO,)

only

Record

1kHz

w/DOLBY

sw.

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

BLOCK

DIAGRAM

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Fig.

6-1

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