Teac CX-400 Bedienungsanleitung

TEAC,

SERVICE

MANUAL

Stereo

Cassette

Deck

Effective:

May,

1980

BOO062

5704005400.

SPECIFICATIONS

AND

SERVICE

DATA

SPECIFICATIONS

Track

System

4-track,

2-channel

stereo

Heads

Erase,

record

playback

Type

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

(1.09

mV)/

kohms

Min.

input

level;

—67

(346

pV)

LINE

IN:

Specified.

input

level;

—9

(275

mV)/

kohms

Min.

input

level;

-19

(86.9

mV)

DIN*:

Min.

input

level;

—45

(4.36

mV)

*Pursuant

DIN

standards

Output

(level

and

load

impedance)

OUTPUT:

Spec.

output

level;

—5

(436

mvV)/

kohms.

Max.

output

level;

—2.5

(581

mV)

PHONES:

Spec.

output

level;

-16

dB(123

mV)/8

ohms

Equalization

METAL:

3180

70.us

(CrO,):

3180

NORMAL:

3180

120

Head

Configuration

1/2-track,

1-channel

erase

head

1/4-track,

2-channel

dual-gap

record

and

playback

heads

Motor

servo

motor

Bias

Frequency

100

kHz

Operation

Position

Horizontal

Power

Requirements

100/117/220/240

AC,

50/60.

Hz,

(General

Export

Model)

117

AC,

Hz,

(U.S.A./Canada

Model)

220

AC,

Hz,

(Europe

Model)

240

AC,

Hz,

(U.K./Australia

Model)

Weight

6.1

(13-7/16

lbs.)

net

7.7

(17

Ibs.)

net

(Some

General

Exp.

Models

have

wood

case.)

Dimensions

See

page

Noise

reduction

circuit

made

under

license

from

Dolby

Laboratories.

The

word

“Dolby”

and

the

Double-D

sym-

bol

are

trademarks

Dolby

Laboratories.

CAUTION

A\Parts

marked

with

this

sign

are

safety

critical

components.

They

must

always

replaced

with

identical

components

—

refer

the

TEAC

parts

list

and

ensure

exact

replace-

ment.

SERVICE

DATA

MECHANICAL

Tape

Speed

Deviation

3,000

+60

Tape

Speed

Drift

Hz.

Wow

and

Flutter

Playback:

0.10%

(WRMS)

Record/Playback:

0.25%

(RMS)

Pinch

Roller

Pressure

350

450

(12.3

15.9

02)

Reel

Torque

Take-up:

g-cm

(0.56

0.83

oz-inch)

Supply:

g-crn

(0.028

0.083

oz-inch)

FF:

150

g-cm

(1.1

2.1

oz-inch)

REW:

150

g-cm

(1.2

2.1

oz-inch)

Fast

Wind

Time

110

sec.

less

for

MTT-501

(C-60)

Auto

End-stop

Time

sec.

less

ELECTRICAL

Frequency

Response

Playback

(Co

(CrO2))

40Hz

+42,

-4

(METAL)

63Hz

+2,-24B

315

OdB(Ref.)

2kHz

+2,—2dB

4kHz

+4,-2dB

6.3

kHz

+4,—-2dB

10kHz

+4,-—5

Overall

40Hz

+4,-4dB

63Hz

+4,-4dB

125Hz

+2,-24B

400

0dB

(Ref.)

6.3

kHz

+2,—2dB

kHz

+3,

=2.5

dB;

Sea

icy

SkHz

+#3,—3

10kHz

43,—-4ap

{

NORMAL

Signal-to-noise

Ratio

Playback

NORMAL;

min.

METAL/Co

(CrO,);

min.

Record/Playback

METAL,

(CrO,);44

min.

NORMAL;

min.

S/N

improved

kHz

and

above

kHz

when

Dolby

NR*®

used.

Erase

Efficiency

min.

kHz

(measured

with

input

higher

than

the

specified

input

level).

Channel

Separation

min.

kHz.

Adjacent

Track

Crosstalk

min.

125

Total

Harmonic

Distortion

METAL/Co(CrO2);

2.2%

less.

NORMAL;

2.5%

less

NOTES:

Improvements

may

result

SPECIFICATIONS

AND

SERVICE

DATA

changes.

Value

“dB”

the

data

telers

(0.

775

v),

eXx-

cept

where

specified.

REMOVAL

EXTERNAL

COMPONENTS

Disassemble

number-order

Broken

line

indicates

some

General

Export

models.

Fig.

1-1

Dimensions

CX-400

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

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_

MECHANICAL

ADJUSTMENTS

AND

CHECKS

4-1

CAPSTAN

ASSEMBLY

THRUST

Capstan

shaft

thrust

value:

0.05

0.15

4-2

PINCH

ROLLER

PRESSURE

Set

the

play

mode

with

tape.

Measure

the

pinch

roller

pressure

when

the

pinch

roller

just

begins

rotation

after

separated

from

the

capstan

shaft.

Pinch

roller

pressure:

350

450

(12.3

15.9

oz)

4-3

REEL

TORQUE

Load

cassette

torque

meter

and

read

the

pointer

indica-

tion

the

dial

scale

for

each

tape

movement

operation.

Take-up

g-cm

(0.56

0.83

oz-inch)

Supply:

g-cm

(0.028

0.083

oz-inch)

F.F.:

150

g-cm

(1.1

2.1

oz-inch)

REW.:

150

g-cm

(1.2

2.1

0z-inch)

4-4

TAPE

SPEED

Load

and

play

TEAC

MTT-111

test

tape.

Using

common

slotted

screwdriver

with

handle

com-

pletely

insulated

from

the

screwdriver

blade,

adjust

the

control

the

motor

(as

far

possible)

for

reading

3,000

(Spec.:

3,000

Hz).

NOTE:

This

tape

speed

setting

should

done

after

about

seconds

operating

time.

Check

the

following

any

portion

the

tape

run.

Tape

speed

deviation

......

3,000

+60

Tape

speed

drift...

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

4-5

TENSION

ARM

Check

that

when

the

PLAY

key

pushed

then

locked,

the

tension

arm’s

projection

within

the

specified

area

shown.

not,

adjustment

can

done

using

the

indicated

screws.

specified

area

djusting

edison

erase

head

Fig.

4-1

4-6

LUBRICATION

Lubrication

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,

equivalent

Grease:

ORE-LUBE

G1/3

equivalent

Apply

drop

oil

with

oil

applicator

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.

Apply

suitable

amount

light

grease

the

well

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.

Remove

the

top

cover

the

deck

removing

the

screws

from

the

sides.

Locate

the

voltage

selector,

shown

the

illustration,

near

the

power

transformer.

Loosen

the

two

screws

the

shorting

bar

and

move

the

bar

that

shorts

across

the

terminals

marked

with

the

required

voltage

(100,

117,

220

240).

Retighten

the

screws.

Replace

the

top

cover.

T-I771

Shorting

Bar

Fig.

4-3

CX-400

4-8

MUTING

SWITCH

When

the

PLAY

key

pressed

then

locked,

the

muting

switch

should

pushed

positively.

;

When

the

STOP

mode,

the

switch

should

return

the

original

released

condition.

4-9

MOTOR

SWITCH

Adjust

the

switch

position

that

the

STOP

condition

the

movable

contact

the

switch

makes

contact

with

the

brake

plate

shown.

After

the

power

the

deck

switched

on,

when

the

PLAY,

F.F.,

REW

keys

are

depressed,

the

motor

switch

should

operate

start

motor

rotation.

When

the

STOP

condition,

the

switch

should

operate

stop

motor

rotation.

4-10

PAUSE

SWITCH

Adjust

the

switch

position

meet

the

following

require-

ments.

When

the

PAUSE

key

fully

depressed

hand,

distance

PAUSE

SWITCH

ADJUSTMENT

When

PAUSE

key

fully

pushed

pause

lever

than

0.5mm

When

PAUSE

key

locked

about

imm

LOCK

PLATE

RELEASE

SOLENOID

ADJUSTMENT

adjusting

screws

—__—

solenoid

about

7mm

flywheel

F.F.,

PLAY,

REW

lat

tock

plate

REC

key

Fig.

4-4

between

the

pause

lever

and

the

conducting

portion

the

switch’s

movable

leaf

should

not

less

than

0.5

prevent

the

switch

from

grounding.

When

the

PAUSE

key

locked,

the

fixed

contact

should

deflected

about

after

both

contacts

are

touch-

ed.

4-11

REWIND

SWITCH

Check

that

when

the

REW

key

pressed

and

locked

the

switch

actuated

positively.

4-12

LOCK

PLATE

RELEASE

SOLENOID

Adjust

the

lock

plate

release

solenoid

position

that

when

its

plunger

pushed

into

the

solenoid

housing

(bottomed)

hand,

the

solenoid

positioned

far

from

the

operation

keys

possible

but

sure

that

the.

lock

plate

does

not

foul

the

flywheel.

2..Check

that

while

the

solenoid

plunger

kept

pushed

and

the

course

that

each

F.F.,

PLAY,

REW

REC

key

depressed,

the

clearance

pointed

out

the

illus-

tration

gotten.

MOTOR

SWITCH

ADJUSTMENT

adjusting

screw

brake

plate

contact

STOP

mode

rewind

switch

muting

switch

—_

lock

plate

release

solenoid

”

lock

plate

ELECTRICAL

ADJUSTMENTS

AND

CHECKS

PRECAUTIONS

Before

performing

adjustments

and

checks,

clean

and

demagnetize

the

entire

tape

path.

Make

sure

the

deck

properly

set

for

the

voltage

your

locality.

general,

adjustments

and

checks

are

done

the

order

L-ch

then

R-ch.

Double

REF.

Nos.

and

test

point

de-

signations

indicate

L-ch/R-ch.

(Example:

R11/R21)

The

value

“dB”

refers

(0.775

V).

voltmeter

calibrated

used,

ap-

‘propriate

compensation

should

made.

The

voltmeter

used

the

procedures

must

have

input

impedance

M-ohms

more.

Note

the

“Deck

settings’’

the

top

each

chart.

The

settings

must

used

for

all

the

checks

the

chart

un-

less

explicitly

stated

otherwise.

OSCILLOSCOPE

OSCILLATOR

DISTORTION

ANALYZER

Voltmeter

IkHz

FILTER

Ss2

“ATTENUATOR

Fig.

5-1

Basic

test

setup

—70

...

What

doés

mean?

CX-400

Values

are

often

given

this:

“—70

more”’.

This

sometimes

leads

confusion.

—76

than

—70

less?

put

the

record

straight,

the

“more”

refers

the

absolute

value.

The

absolute

value

—70

|70|.

The

absolute

value

|76|

which

than

70.

So,

—76

“more”

than

—70

—55

“‘less’’

than

—60

Deck

settings:

MONITOR

sw.

—TAPE

DOLBY

sw.

—

OUT

TEAC

test

tapes:

INPUT

sw.

—

LINE

MTT-506:

For

record

test

with

Co(CrO2

)

OUTPUT

cont.

—

Spec.

position

(item

MTT-501:

For

record

test

with

NORMA/

5-3.

RECORDING

PERFORMANCE

RECORD

cont.

—

Spec.

position

(item

METAL:

For

record

test

with

METAL

MEASURING

POINT

ADJUST

INSTRUCTION

INPUT

SIGNAL

(or

CHECK)

REMARKS

RESULT

LINE

BIASTRAPTP

10.

Bias

trap

Record-pause

mode

signal

L106/L206

Min.

reading

LINE

OUTPUT

BIAS/EQ

—

(Cr0,

)

11.

Record

bias

6.3

kHz/—42

C163/C263

2.5

+1.5

Tape

—

MTT-506

(6.15

mV)

over-bias

LINE

BIAS/EQ

—

(C10,

)

OUTPUT

Tape

-MTT-506

acm

aaa

—8

(308

mV)

IAS/EQ

—

NORMAL

12.

Record

level

BIAS/EO

TTS

(275

mV~346

mV)

BIAS/EQ

—

METAL

Tape

—

METAL

LINE

BIAS/EQ

—

METAL

400

Hz/—12

OUTPUT

Tape

—

METAL

(195

mV)

2.2%

less

13.

Total

harmonic

BIAS/EQ

—

(CrO,)

distortion

Tape

—

MTT-506

BIAS/EQ

—

NORMAL

Tape

—

MTT-501

2.5%

less

OUTPUT

BIAS/EQ

—

(C10,

)

LINE

40H

+4;

—4

(

Tape

—

MTT-506

Required

signal/

Soe

742.4B

(6.15

mV)

|}1103/L203

133232)

-2

BIAS/EQ

—

NORMAL

‘|

400Hz

04dB

(Ref.)

14.

Frequency

Tape

—

MTTS01

response

BIASIEQ-METAL

|aqapsnong

Lee

Tape

—

METAL

1104/1204

10kHz

+3,

-4

frequency

response

wrong,

recheck

steps

and

13.

BIAS/EQ

—

METAL

OUTPUT

Tape

—

METAL

LINE

min.

ratio

15.

Signal-to-noise

BIAS/EQ

—

(CrO,)

iia

—9

(275

mV)

sie

spec.

ratio

signal

‘to

noise

BIAS/EQ

—

NORMAL

Tape

—

MTT-501

min.

ratio

Connection

—

Fig.

5-1.

But

switch

kHz

filter.

Record

kHz.

Rewind

tape

mid

point

recorded

portion.

“no

signal”

recording.

Get

difference

between

kHz

portion

and

its

erased

portion.

16.

Erase

efficiency

LINE

Ref,

output

1kHz/+1

dBo

level:

BIAS/EQ

—

METAL

(0.869V)

OUTPUT

min.

ratio

Tape

METAL

(1.38V)

signal

Connection

—

Fig.

5-1.

But

switch

kHz

filter.

Record

kHz.

Then

push

REC

MUTE

button

for

several

sec,

Rewind

and

play

tape.

Get

difference

between

kHz

portion

and

the

“no

signal”

portion.

17.

REC

MUTE

function

Teva

Ref.

output

BIAS/EQ

—

METAL

(0.869V)

OUTPUT

level:

(

Tape

—

METAL

min.

ratio

signal

(1.38V)

MEASURING

cael

cae

POINT

ADJUST

INSTRUCTION

INPUT

SIGNAL

(or

CHECK)

REMARKS

RESULT

Connection

—

Fig,

5-1.

But

not

connect

LINE

(R),

switch

kHz

filter.

Set

deck

irirecord

mode.

Find

differences

between

kHz

recorded

portion

(L-ch)

and

“no

signal’’

portion

(R-ch).

18.

Channel

separation

LINE

;

BIAS/EQ

—

(C10,

)

L-ch

kHz/—9

OUTPUT

Tape

—

MTT-506

(275

mV)

min.

ratio

R-ch

signal

Connection

—

Fig,

5-1,

But

not

connect

LINE

(L)

and

OUTPUT

(L).

Record

125

R-ch.

Note

output

level

its

recorded

portion.

Invert

tape

and

play

R-ch

track.

Check

leakage

level

against

the

output

reference

19.

Adjacent

track

previously

recorded

portion,

;

crosstalk

LINE

BIAS/EQ

—

(Cr0,)

L-ch

signal

OUTPUT

Tape

—

MTT-506

R-ch

125

Hz/—9

min.

ratio

(275

mV)

Record

kHz

with

DOLBY

switch

OUT.

Play

its

portion

with

switch,

OUT

and

IN.

Get

the

output

level

difference

between

OUT

and

positions.

Repeat

the

above

process

for

kHz.

LINE

OUTPUT

20.

Dolby

effect

Mere

kHz/—29

Variation

(27.5

mV)

dB~8

”

kHz/—39

(8.69

mV)

;

TEAC

REC

PLAY

C163/C263

Record

bias

L103/L203

Record

frequency

response

for

(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

EXPLODED

VIEWS

AND

PARTS

LIST

’

EXPLODED

VIEW

-1

3-Round

Washer

Head{BLK)

eaiaeaaatey

}

3-Fiber

Washer(BLK)

G4.2xB1OxtO.5

LIMITED

AREA

M4xtO

2=PTT

M3xl0

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