Teac CX-400 Manuel utilisateur

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TEAC,

SERVICE

MANUAL

Stereo

Cassette

Deck

Effective:

May,

1980

BOO062

5704005400.

SPECIFICATIONS

AND

SERVICE

DATA

SPECIFICATIONS

Track

System

4-track,

2-channel

stereo

3

Heads

Erase,

record

&

playback

Type

of

Tape

Cassette

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;

—57

dB

(1.09

mV)/

10

kohms

Min.

input

level;

—67

dB

(346

pV)

LINE

IN:

Specified.

input

level;

—9

dB

(275

mV)/

50

kohms

Min.

input

level;

-19

dB

(86.9

mV)

DIN*:

Min.

input

level;

—45

dB

(4.36

mV)

,

*Pursuant

to

DIN

standards

Output

(level

and

load

impedance)

OUTPUT:

Spec.

output

level;

—5

dB

(436

mvV)/

50

kohms.

Max.

output

level;

—2.5

aB

(581

mV)

PHONES:

Spec.

output

level;

-16

dB(123

mV)/8

ohms

-

Equalization

a

METAL:

3180

us

+

70.us

Co

(CrO,):

3180

us

+

70

ys

NORMAL:

3180

us

+

120

ys

Head

Configuration

~~

1/2-track,

1-channel

erase

head

1/4-track,

2-channel

dual-gap

record

and

playback

heads

Motor

DC

servo

motor

,

Bias

Frequency

100

kHz

Operation

Position

Horizontal

Power

Requirements

100/117/220/240

V

AC,

50/60.

Hz,

12

W.

(General

Export

Model)

117

V

AC,

60

Hz,

12

W

(U.S.A./Canada

Model)

220

V

AC,

50

Hz,

12

W

(Europe

Model)

240

V

AC,

50

Hz,

12

W

(U.K./Australia

Model)

Weight

6.1

kg

(13-7/16

lbs.)

net

7.7

kg

(17

Ibs.)

net

(Some

General

Exp.

Models

have

wood

case.)

Dimensions

See

page

3.

*

Noise

reduction

circuit

made

under

license

from

Dolby

Laboratories.

The

word

“Dolby”

and

the

Double-D

sym-

bol

are

trademarks

of

Dolby

Laboratories.

CAUTION

A\Parts

marked

with

this

sign

are

safety

critical

components.

They

must

always

be

replaced

with

identical

components

—

refer

to

the

TEAC

parts

list

and

ensure

exact

replace-

ment.

SERVICE

DATA

MECHANICAL

Tape

Speed

Deviation

3,000

Hz

+60

Hz

Tape

Speed

Drift

60

Hz.

-

Wow

and

Flutter

Playback:

0.10%

(WRMS)

Record/Playback:

0.25%

(RMS)

Pinch

Roller

Pressure

350

g

to

450

g

(12.3

oz

to

15.9

02)

Reel

Torque

Take-up:

40

to

60

g-cm

(0.56

to

0.83

oz-inch)

Supply:

2

to

6

g-crn

(0.028

to

0.083

oz-inch)

FF:

80

to

150

g-cm

(1.1

to

2.1

oz-inch)

REW:

90

to

150

g-cm

(1.2

to

2.1

oz-inch)

Fast

Wind

Time

110

sec.

or

less

for

MTT-501

(C-60)

Auto

End-stop

Time

6

sec.

or

less

ELECTRICAL

Frequency

Response

Playback

(Co

(CrO2))

40Hz

+42,

-4

dB

(METAL)

63Hz

+2,-24B

315

Hz

OdB(Ref.)

2kHz

+2,—2dB

4kHz

+4,-2dB

6.3

kHz

+4,—-2dB

10kHz

+4,-—5

dB

Overall

40Hz

+4,-4dB

63Hz

+4,-4dB

125Hz

+2,-24B

400

Hz

0dB

(Ref.)

6.3

kHz

+2,—2dB

8

kHz

+3,

=2.5

dB;

Sea

icy

ml

SO

SkHz

+#3,—3

dB

+

4

10kHz

43,—-4ap

{

NORMAL

Signal-to-noise

Ratio

Playback

NORMAL;

46

dB

min.

METAL/Co

(CrO,);

47

dB

min.

Record/Playback

METAL,

Co

(CrO,);44

dB

min.

NORMAL;

43

dB

min.

S/N

is

improved

by

5

dB

at

1

kHz

and

10

dB

above

5

kHz

when

Dolby

NR*®

is

used.

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

METAL/Co(CrO2);

2.2%

or

less.

NORMAL;

2.5%

or

less

NOTES:

e@

Improvements

may

result

in

SPECIFICATIONS

AND

SERVICE

DATA

changes.

e

Value

of

“dB”

in

the

data

telers

to

0

dB

(0.

775

v),

eXx-

cept

where

specified.

2

REMOVAL

OF

EXTERNAL

COMPONENTS

Disassemble

in

number-order

Broken

line

indicates

some

General

Export

models.

_

Fig.

1-1

Dimensions

CX-400

|

3

PARTS

LOCATION

VOLTAGE

SELECTOR

PCB

ASS'Y

(GENERAL

EXPORT

ONLY)

POWER

TRANSFORMER

REC

PLAY

AMPL

PCB

ASS'Y

POWER

SUPPLY

PCB

ASS’Y

POWER

SWITCH

CAPSTAN

MOTOR

METER

AMPL

PCB

ASS'Y

Fig.

3-1

SUPPLY

REEL

TABLE

FL

PEAK

LEVEL

METER

POWER

SWITCH

TAKE-UP

REEL

TABLE

RECORD

CONTROLS

ERASE

HEAD

PINCH

ROLLER

OUTPUT

CONTROL

CASSETTE

HOLDER

REC-PLAY

HEAD

COUNTER

Fig.

3-2

|

cxa00_

4

MECHANICAL

ADJUSTMENTS

AND

CHECKS

4-1

CAPSTAN

ASSEMBLY

THRUST

Capstan

shaft

thrust

value:

0.05

mm

to

0.15

mm

4-2

PINCH

ROLLER

PRESSURE

1.

Set

in

the

play

mode

with

no

tape.

2.

Measure

the

pinch

roller

pressure

when

the

pinch

roller

just

begins

rotation

after

it

is

separated

from

the

capstan

shaft.

Pinch

roller

pressure:

350

g

to

450

g

(12.3

oz

to

15.9

oz)

4-3

REEL

TORQUE

1.

Load

a

cassette

torque

meter

and

read

the

pointer

indica-

tion

on

the

dial

scale

for

each

tape

movement

operation.

Take-up

40

to

60

g-cm

(0.56

to

0.83

oz-inch)

Supply:

2

to

6

g-cm

(0.028

to

0.083

oz-inch)

F.F.:

80

to

150

g-cm

(1.1

to

2.1

oz-inch)

REW.:

90

to

150

g-cm

(1.2

to

2.1

0z-inch)

4-4

TAPE

SPEED

1.

Load

and

play

a

TEAC

MTT-111

test

tape.

2.

Using

a

common

slotted

screwdriver

with

a

handle

com-

pletely

insulated

from

the

screwdriver

blade,

adjust

the

control

on

the

motor

(as

far

as

possible)

for

a

reading

of

3,000

Hz

(Spec.:

3,000

Hz

+5

Hz).

NOTE:

This

tape

speed

setting

should

be

done

after

about

20

seconds

of

operating

time.

3.

Check

the

following

at

any

portion

of

the

tape

run.

Tape

speed

deviation

......

3,000

Hz

+60

Hz

Tape

speed

drift...

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

.

60

Hz

4-5

TENSION

ARM

1.

Check

that

when

the

PLAY

key

is

pushed

then

locked,

the

tension

arm’s

projection

is

within

the

specified

area

as

shown.

4.

If

not,

adjustment

can

be

done

using

the

indicated

screws.

specified

area

djusting

edison

<f

erase

head

Fig.

4-1

4-6

LUBRICATION

Lubrication

is

only

required

when

parts

are

replaced.

For

this

purpose,

use

the.

oil

and

grease

specified

below.

Oil:

TEAC

spindle

oil

(from

TEAC

TZ-255

oil

kit),

Mobil

D.T.E.

Oil

Light,

or

equivalent

Grease:

ORE-LUBE

G1/3

or

equivalent

1.

Apply

a

drop

of

oil

with

an

oil

applicator

to

a

point

ab-

out

1/3

the

way

down

the

shaft

(from

the

free

end)

of.

the

flywheel,

then

insert

the

shaft

into

the

capstan

hous-

ing.

2.

Apply

a

suitable

amount

of

light

grease

to

the

well

of

the

flywheel

bearing.

Flywheel

Ass’y

OIL

GREASE

TA-1024

Fig.

4-2

4-7

VOLTAGE

CONVERSION

(GENERAL

EXPORT

MODEL

ONLY)

ALWAYS

DISCONNECT

THE

POWER

LINE

CORD

BE-

FORE

MAKING

THESE

ADJUSTMENTS.

1.

Remove

the

top

cover

of

the

deck

by

removing

the

screws

from

the

sides.

2.

Locate

the

voltage

selector,

shown

in

the

illustration,

near

the

power

transformer.

3.

Loosen

the

two

screws

in

the

shorting

bar

and

move

the

bar

so

that

it

shorts

across

the

terminals

marked

with

the

required

voltage

(100,

117,

220

or

240).

.

Retighten

the

screws.

.

Replace

the

top

cover.

wp

T-I771

Shorting

Bar

Fig.

4-3

CX-400

|

|

4-8

MUTING

SWITCH

1.

When

the

PLAY

key

is

pressed

then

locked,

the

muting

switch

should

be

pushed

positively.

;

2:

When

in

the

STOP

mode,

the

switch

should

return

to

the

original

released

condition.

4-9

MOTOR

SWITCH

1.

Adjust

the

switch

position

so

that

in

the

STOP

condition

the

movable

contact

of

the

switch

makes

contact

with

the

brake

plate

as

shown.

2.

After

the

power

on

the

deck

is

switched

on,

when

the

PLAY,

F.F.,

or

REW

keys

are

depressed,

the

motor

switch

should

operate

to

start

motor

rotation.

3,

When

in

the

STOP

condition,

the

switch

should

operate

to

stop

motor

rotation.

4-10

PAUSE

SWITCH

1.

Adjust

the

switch

position

to

meet

the

following

require-

ments.

2.

When

the

PAUSE

key

is

fully

depressed

by

hand,

distance

PAUSE

SWITCH

ADJUSTMENT

When

PAUSE

key

is

fully

pushed

pause

lever

than

0.5mm

When

PAUSE

key

is

locked

|

as

about

imm

-

Ro

4

LOCK

PLATE

RELEASE

SOLENOID

ADJUSTMENT

adjusting

screws

@

—__—

solenoid

about

7mm

flywheel

:

F.F.,

PLAY,

REW

lat

tock

plate

or

REC

key

Fig.

4-4

between

the

pause

lever

and

the

conducting

portion

of

-

the

switch’s

movable

leaf

should

not

be

less

than

0.5

mm

so

as

to

prevent

the

switch

from

grounding.

:

3.

When

the

PAUSE

key

is

locked,

the

fixed

contact

should

be

deflected

by

about

1

mm

after

both

contacts

are

touch-

ed.

4-11

REWIND

SWITCH

1.

Check

that

when

the

REW

key

is

pressed

and

locked

the

switch

is

actuated

positively.

4-12

LOCK

PLATE

RELEASE

SOLENOID

1.

Adjust

the

lock

plate

release

solenoid

position

so

that

when

its

plunger

is

pushed

into

the

solenoid

housing

(bottomed)

by

hand,

the

solenoid

is

positioned

as

far

from

the

operation

keys

as

possible

but

be

sure

that

the.

lock

plate

does

not

foul

the

flywheel.

2..Check

that

while

the

solenoid

plunger

is

kept

pushed

and

in

the

course

that

each

F.F.,

PLAY,

REW

or

REC

key

is

depressed,

the

clearance

pointed

out

in

the

illus-

tration

is

gotten.

MOTOR

SWITCH

ADJUSTMENT

adjusting

screw

brake

plate

To

contact

in

STOP

mode

rewind

switch

muting

switch

—_

lock

plate

release

solenoid

”

lock

plate

5

ELECTRICAL

ADJUSTMENTS

AND

CHECKS

PRECAUTIONS

|

1.

Before

performing

adjustments

and

checks,

clean

and

demagnetize

the

entire

tape

path.

2.

Make

sure

the

deck

is

properly

set

for

the

voltage

in

_

your

locality.

3.

In

general,

adjustments

and

checks

are

done

in

the

order

of

L-ch

then

R-ch.

Double

REF.

Nos.

and

test

point

de-

signations

indicate

L-ch/R-ch.

_

(Example:

R11/R21)

4.

The

value

of

“dB”

refers

to

0

dB

(0.775

V).

If

an

AC

voltmeter

calibrated

to

0

dB

(1

V)

is

to

be

used,

ap-

‘propriate

compensation

should

be

made.

5.

The

AC

voltmeter

used

in

the

procedures

must

have

an

input

impedance

of

1

M-ohms

or

more.

6.

Note

the

“Deck

settings’’

at

the

top

of

each

chart.

The

settings

must

be

used

for

all

the

checks

or

the

chart

un-

less

explicitly

stated

otherwise.

OSCILLOSCOPE

OSCILLATOR

DISTORTION

ANALYZER

©

AC

Voltmeter

IkHz

FILTER

"

Ss2

“ATTENUATOR

:

Fig.

5-1

Basic

test

setup

—70

dB

or

more

...

What

doés

it

mean?

|

CX-400

Values

in

dB

are

often

given

like

this:

“—70

dB

or

more”’.

This

sometimes

leads

to

confusion.

Is

—76

dB

more

than

.

—70

dB

or

less?

To

put

the

record

straight,

the

“more”

refers

to

the

absolute

value.

The

absolute

value

of

—70

is

|70|.

The

absolute

value

of

76

is

|76|

which

is

6

more

than

70.

So,

—76

dB

is

“more”

than

—70

dB

—55

dB

is

“‘less’’

than

—60

dB

Deck

settings:

MONITOR

sw.

—TAPE

DOLBY

NR

sw.

—

OUT

TEAC

test

tapes:

INPUT

sw.

—

LINE

MTT-506:

For

record

test

with

Co(CrO2

)

OUTPUT

cont.

—

Spec.

position

(item

2)

MTT-501:

For

record

test

with

NORMA/

5-3.

RECORDING

PERFORMANCE

RECORD

cont.

—

Spec.

position

(item

8)

METAL:

For

record

test

with

METAL

MEASURING

POINT

ADJUST

INSTRUCTION

_

INPUT

SIGNAL

(or

CHECK)

REMARKS

RESULT

LINE

IN

BIASTRAPTP

10.

Bias

trap

Record-pause

mode

No

signal

L106/L206

Min.

reading

LINE

IN

OUTPUT

:

,

BIAS/EQ

—

Co

(Cr0,

)

)

11.

Record

bias

=

5:

2

6.3

kHz/—42

dB

C163/C263

2.5

dB

+1.5

dB

Tape

—

MTT-506

(6.15

mV)

:

over-bias

_

~

|

LINE

IN

BIAS/EQ

—

Co

(C10,

)

OUTPUT

Tape

-MTT-506

Pi

acm

aaa

id

—8

dB

(308

mV)

IAS/EQ

—

NORMAL

12.

Record

level

BIAS/EO

TTS

_8

dB

+1

4B

(275

mV~346

mV)

BIAS/EQ

—

METAL

Tape

—

METAL

LINE

IN

:

BIAS/EQ

—

METAL

400

Hz/—12

dB

OUTPUT

Tape

—

METAL

(195

mV)

2.2%

or

less

13.

Total

harmonic

BIAS/EQ

—

Co

(CrO,)

.

distortion

Tape

—

MTT-506

BIAS/EQ

—

NORMAL

Tape

—

MTT-501

2.5%

or

less

OUTPUT

BIAS/EQ

—

Co

(C10,

)

LINE

IN

40H

+4;

—4

dB

(

Tape

—

MTT-506

Required

signal/

~

ea

Soe

742.4B

(6.15

mV)

_

|}1103/L203

|

133232)

-2

68

BIAS/EQ

—

NORMAL

‘|

400Hz

04dB

(Ref.)

14.

Frequency

Tape

—

MTTS01

response

we

ee

ee

ee

te

BIASIEQ-METAL

|

»

|aqapsnong

Lee

|

Tape

—

METAL

1104/1204

10kHz

+3,

-4

4B

If

frequency

response

is

wrong,

recheck

steps

11

and

13.

BIAS/EQ

—

METAL

OUTPUT

gt

Tape

—

METAL

LINE

IN

44

dB

min.

ratio

15.

Signal-to-noise

BIAS/EQ

—

Co

(CrO,)

1

iia

—9

dB

(275

mV)

an

sie

of

spec.

ratio

Ue

ge

a

no

signal

ee

‘to

noise

BIAS/EQ

—

NORMAL

a

Tape

—

MTT-501

43

dB

min.

ratio

®

Connection

—

Fig.

5-1.

But

switch

ON

1

kHz

filter.

e

Record

1

kHz.

Rewind

tape

to

mid

point

of

recorded

portion.

Do

“no

signal”

recording.

Get

difference

between

1

kHz

portion

and

its

erased

portion.

16.

Erase

efficiency

LINE

IN

Ref,

output

:

|

1kHz/+1

dBo

:

level:

BIAS/EQ

—

METAL

(0.869V)

OUTPUT

65

dB

min.

ratio

+5

dB

Tape

~

METAL

(1.38V)

no

signal

e

Connection

—

Fig.

5-1.

But

switch

ON

1

kHz

filter.

e

Record

1

kHz.

Then

push

REC

MUTE

button

for

several

sec,

Rewind

and

play

tape.

Get

difference

between

1

kHz

portion

and

the

“no

signal”

portion.

17.

REC

MUTE

nN

:

function

:

Teva

an

Ref.

output

~

BIAS/EQ

—

METAL

(0.869V)

OUTPUT

-

|

level:

(

Tape

—

METAL

:

,

65

dB

min.

ratio

+5

dB

no

signal

.

(1.38V)

10

MEASURING

cael

cae

POINT

ADJUST

INSTRUCTION

INPUT

SIGNAL

(or

CHECK)

|

REMARKS

RESULT

e

Connection

—

Fig,

5-1.

But

do

not

connect

LINE

IN

(R),

switch

ON

1

kHz

filter.

e

Set

deck

irirecord

mode.

Find

differences

between

1

kHz

recorded

portion

(L-ch)

and

“no

signal’’

portion

(R-ch).

18.

Channel

separation

LINE

IN

;

BIAS/EQ

—

Co

(C10,

)

L-ch

1

kHz/—9

dB

OUTPUT

Tape

—

MTT-506

(275

mV)

_

30

dB

min.

ratio

R-ch

No

signal

e@

Connection

—

Fig,

5-1,

But

do

not

connect

LINE

IN

(L)

and

OUTPUT

(L).

e

Record

125

Hz

on

R-ch.

Note

output

level

of

its

recorded

portion.

Invert

tape

and

play

R-ch

track.

Check

leakage

level

against

the

output

reference

19.

Adjacent

track

of

previously

recorded

portion,

;

crosstalk

LINE

IN

BIAS/EQ

—

Co

(Cr0,)

L-ch

No

signal

OUTPUT

.

Tape

—

MTT-506

R-ch

125

Hz/—9

dB

40

dB

min.

ratio

(275

mV)

:

@

Record

1

kHz

with

DOLBY

NR

switch

to

OUT.

Play

its

portion

with

switch,

OUT

and

IN.

Get

the

output

level

difference

between

OUT

and

IN

positions.

Repeat

the

above

process

for

10

kHz.

LINE

IN

OUTPUT

20.

Dolby

NR

effect

ee

Mere

2)

1

kHz/—29

dB

Variation

(27.5

mV)

3

dB~8

dB

”

10

kHz/—39

dB

(8.69

mV)

;

TEAC

REC

PLAY

C163/C263

|

Record

bias

L103/L203

|

Record

frequency

response

for

Co

(CrO,)

and

NORMAL

L104/L204,)

Record

frequency

response

for

METAL

—

L106/L206

|

Bias

trap

R11/R21

Output

level

R12/R22

Playback

frequency

response

R13/R23

—

|

Peak

level

meter

‘R14/R24

Record

level

Fig.

5-6

11

6

EXPLODED

VIEWS

AND

PARTS

LIST

’

EXPLODED

VIEW

-1

3-Round

Washer

Head{BLK)

x

,

eaiaeaaatey

}

3-Fiber

Washer(BLK)

NS

RR

G4.2xB1OxtO.5

LIMITED

AREA

M4xtO

[>

_

2=PTT

M3xl0

12