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TEAC.

SERVICE

MANUAL

V-2RX/V-4RX

Stereo

Cassette

Deck

Effective:

November,

1982

B-20187

5704016100

-V-2RX/V-4RX

_

1

SPECIFICATIONS

AND

SERVICE

DATA

Notes:

1.

Improvements

may

result

in

changes

in

specifications

and

service

data.

2.

O

dB

is

referenced

to

0.775

V

in

this

manual.

SPECIFICATIONS

Track

system

4-track,

2-channel

stereo

Heads

3:

Erase,

record

and

playback

(V-2R

xX)

2:

Erase,

record/playback

(V-4RX)

Type

of

tape

Cassette

tape,

C-60

and

C-90

(Philips

type)

Tape

speed

4.76

cm/s

(1-7/8

ips)

Input

(level

and

impedance)

MICRO-

PHONE:

Specified

input

level:

~57

dB

(1.09

mV)/10

kahms

Minimum

input

level:

-67

dB

(346

nV)

LINE

IN:

Specified

input

level:

-9

dB

(275

mV)/50

kohms

Minimum

input

level:

~19

dB

(86.9

mV}

Output

(level

and

impedance)

OUTPUT:

Specified

output

level:

-3.5

dB

(518

mV)/

50

kohms

PHONES:

Specified

output

level:

-15

dB

(138

mV)/8

ohms

Equalization

‘METAL:

3180

us+

70us

Co(CrO,):

3180us+

70us

NORMAL:

3180

ys

+

120

us

Head

configuration

1/2-track,

1-channel

erase

head

1/4-track,

2-channel

record

and

playback

head

(V-2RX)

1/4-track,

2-channel

record/playback

head

(V-4RX)

Motors

1

DC

servo

motor

(for

capstan

drive)

4

DC

motor

(for

reel

drive)

Bias

frequency

100

kHz

Operation

position

Horizontal

Power

requirements

100/120/220/240

V

AC,

50/60

Hz,

29

W

(V-4RX:

28

W)

(General

export)

120

V

AC,

60

Hz,

29

W

(V-4RX:

28

W)

(U.S.A./Canada)

220

V

AC,

50

Hz,

29

W

(V-4RX:

28

W)

(Europe)

940

V

AC,

50

Hz,

29

W

(V-4RX:

28

W)

(U.K./Australia)

Weight

7.0

kg

(15-7/16

Ibs.)

net

Dimensions

277

mm

(10~7/8")

280

mm

(11"')

SERVICE

DATA

MECHANICAL

Tape

speed

deviation

3,000

Hz

=

70

Hz

Tape

speed

drift

70

Hz

Wow

and

flutter

Playback:

0.06%

(WRMS)

Record/playback:

0.25%

(RMS)

Pinch

roller

pressure

350

g

to

450

g

(12.3

oz

to

15.9

oz)

Reel

Torque

Take-up:

35

to

65

g-cm

(0.49

to

0.90

oz-inch)

Supply:

2

to

4

g-cm

(0.028

to

0.056

oz-inch)

FF./

REW:

80

to

150

g-cm

(1.1

to

2.1

oz-inch)

Fast

winding

time

90

seconds

for

MTT-501

(C-60)

ELECTRICAL

Frequency

response

See

Figs.

5-6

and

5-8

to

5-10

Signal-to-noise

ratio

Playback:

NORMAL:

47

dB

min.

Overall:

METAL,

Co

(CrO,):

46

dB

min.

NORMAL:

45

dB

min.

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

1.8%

or

less

with

METAL

and

Co

(CrO.,)

tapes

2.0%

or

less

with

NORMAL

tape

e

Dolby

Noise

Reduction

System

manufactured

under

license

from

Dolby

Laboratories

Licensing

Corporation.

“Dolby”

and

the

double-D

symbol

are

trademarks

of

Dolby

Laboratories

Licensing

Corporation.

e

dbx

Noise

Reduction

system

made

under

license

from

dbx,

Incorporated.

The

name

“dbx”

and

the

dbx

symbol

are

trademarks

of

dbx,

Incorporated.

CAUTION

¢.

Parts

marked

with

this

sign

are

safety

critical

components.

They

must

always

be

replaced

with

identical

components

—

refer

to

the

appropriate

parts

list

and

ensure

exact

replace-

ment.

V-2RX/V~4RX

2

CASE

AND

FRONT

PANEL

REMOVAL

umbe

Disassemble

in

n

Fig.

2-1

V-2RX/V-4RX

3

PARTS

LOCATION

POWER

SW

PCB

CONTROL

PCB

DBX

PCB

TIMER

PCB

VOLTAGE

SELECTOR

PEAK

PROGRAM

REC/PLAY

AMPL

PCB

JACK

PCB

LEVEL

METER

UNIT

Fig.

3-1

Top

view

LINEAR

COUNTER

POWER

SWITCH

PEAK

PROGRAM

LEVEL

METER

COUNTER

PCB

TIMER

SWITCH

“RECORD

CONTROL

SW

PCB

SW

PCB

(MEMORY)

OUTPUT

CONTROL

Fig.

3-2

Front

view

V-2RX/V~4RX

RECORD

SAFETY

SWITCH

'

CASSETTE-IN

SWITCH

SENSOR

ARM

SENSOR

ARM

R

ABLE

AK

ECUPABE

AB

ERASE

HEAD

REC

-

PLAY

HEAD

PINCH

ROLLER

Fig.

3-3

Transport

front

view

CASSETTE-IN

SWITCH

RECORD

SAFETY

SWITCH

TAPE

SPEED

CONTROL

REEL

MOTOR

DAMPER

CAPSTAN

MOTOR

PAUSE

SOLENOID

JOINT

PCB

PLAY

SOLENOID

Fig.

3-4

Transport

rear

view

-V-2RX/V-4RX

4

MECHANICAL

CHECKS

AND

ADJUSTMENTS

4-1

PLAY

SOLENOID

1.

With

the

deck

in

the

play

mode,

check

that

the

pinch

roller

is

pressing

against

the

capstan

shaft

and

that

the

pinch

roller

arm

spring

is

released

from

the

pinch

roller

arm.

2.

lf

adjustment

is

required,

adjust

the

position

of

the

play

sole-

noid.

capstan

shaft

pinch

roller

(3

oO

pinch

roller

>

ge

a

arm

spring

5

eX

pinch

roller

arm

Released

here

Fig.

4-1

4-2

PAUSE

SOLENOID

1.

The

clearance

between

the

pinch

roller

and

the

capstan

shaft

should

be

0.3mm

~

0.5

mm

when

the

deck

is

in

the

pause

mode.

2.

If

adjustment

is

required,

adjust

the

position

of

the

pause

sole-

noid.

4-3

TAPE

PATH

ADJUSTMENT

(V-2RX

ONLY)

1.

Load

and

play

a

TEAC

MTT-902

mirror

tape

(C-90)

and

check

for

any

noticeable

tape

curling

on

the

sides

of

the

record-playback

head

guide.

2.

Adjust

the

height

of

the

erase

head

when

curling

is

evident.

3.

The

clearance

between

the

head

base

plate

and

the

head

stopper

should

be

0.3

mm

~

0.5

mm,

as

shown

in

the

figure

below,

when

the

erase

head

is

touching

the

pad

holder

assembly

during

play-

back.

pad

holder

ass’y

2

Head

stopper

erase

head

height

pe

adjustment

nut

Fig.

4-2

4-4

PINCH

ROLLER

PRESSURE

1.

With

the

cassette

holder

shut

and

no

tape

loaded,

putihe

deck

in

the

play

mode

after

pushing

the

cassette-in

switch

senQr

arm

up-

wards

and

holding

it.

2.

Hook

a

spring

scale

on

the

pinch

roller

assembly

as

siOwn

in

the

illustration.

3..

Pull

the

scale

downwards

until

there

is

sufficient

foie

to

sepa-

rate

the

pinch

roller

from

the

capstan

shaft.

4.

Ease

pressure

until

the

pinch

roller

makes

just

enough

contact

with

the

capstan

shaft

so

that

the

pinch

roller

just

begins

to

turn.

At

this

point,

note

the

reading

on

the

scale.

It

shoulel

be

from

350

g

to

450

g

(12.3

oz.

to

15.9

o2.).

Fig.

4-3

4-5

REEL

TORQUE

1.

Load

the

cassette

torque

meter

on

the

deck

and

read

the

pointer

indication

on

the

dial

scale

for

each

tape

transport

operation.

The

measured

torque

should

be

within

the

following

values:

Take-up:

35

to

65

g-cm

(0.49

to

0.90

oz-inch)

Supply:

2

to

4.g-cm

(0.028

to

0.056

oz-inch)

F.F/REW:

80

to

150

g-cm

(1.1

to

2.1

oz-inch)

4-6

TAPE

SPEED

1.

Connect

a

frequency

counter

to

the

deck

as

shown

in

Fig.

4-4.

2.

Play

a

tape

for

more

than

five

minutes

to

warm

up

the

deck,

then

load

a

TEAC

MTT-111

test

tape

containing

a

3000-Hz

test

tone

and

play

the

test

tape.

3.

While

the

tape

is

playing,

use

a

non-metallic

or

insulated

screw-

driver

and

adjust

the

control

on

the

capstan

motor

for

a

reading

of

3015

to

3025

Hz

on

the

frequency

counter.

4.

Play

the

tape

at

the

beginning

and

at

the

end,

and

check

that

the

speed

deviation

is

within

the

‘prescribed

limits

by

observing

that

the

reading

on

the

frequency

counter

never

deviates

more

than

+70

Hz

from

3000

Hz,

nor

drifts

more

than

70

Hz

at

any

given

time.

Frequency

Counter

Oscillator

Wow

&

Flutter

Meter

DECK

under

TEST

R

LINE

IN

(R)

OUTPUT

Fig.

4-4

4-7

WOW

AND

FLUTTER

Note:

These

measurements

should

be

made

at

the

beginning,

middle

and

the

end

of

the

tape.

1)

PLAYBACK

1.

Connect

a

wow-and-flutter

meter

to

the

deck

as

shown

in

Fig.

4-4,

2.

Load

and

play

a

TEAC

MIT-1

T1

test

tape.

3.

Check

that

the

reading

on

the

wow-and-flutter

meter

is

within

G.06%

(WRMS).

RECORD/PLAYBACK

4.

Load

a

blank

TEAC

MTT-501

test

tape

and

record

a

3000-Hz

signal.

5.

Rewind

the

tape

to

the

beginning

of

the

recorded

section,

and

play

it.

6.

The

wow

and

flutter

should

not

be

more

than

0.25%

(RMS),

No

~~

4-8

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.

Oi]

Light,

or

equivalent

Grease:

ORE-LUBE

G1/3

or

equivalent

1.

Apply

a

drop

of

oi!

with

an

oil

applicator

to

a

point

about

1/3

the

way

down

the

shaft,

from

the

free

end

of

the

flywheel,

then

insert

the

shaft

into

the

capstan

housing.

2.

Apply

a

suitable

amount

of

light

grease

to

the

well

of

the

flywheel

bearing.

Capstan

flywheel

ass‘y

G

~

capstan

shaft

S

well

of

flywheel

yy

[

Apply

a

drop

of

oil

here

|

bearing

Capstan

housing

Fig.

4-5

|_V-2RX/V-4RX

4-9

VOLTAGE

CONVERSION

1.

2.

(GENERAL

EXPORT

MODELS

ONLY)

Always

disconnect

the

power

line

cord

before

making

these

adjustments,

Locate

the

voltage

selector

on

the

bottom

side

as

shown

in

the

illustration,

.

Using

a

regular

screwdriver,

turn

the

selector

until

the

numerals

corresponding

to

the

voltage

requirements

of

your

area

appear,

100/120

220/240

Fig.

4-6

_V-2RX/V-GRX

|

5

ELECTRICAL

CHECKS

AND

ADJUSTMENTS

PRECAUTIONS

:

1.

Before

performing

adjustments

and

checks,

clean

and

demag-

netize

the

entire

tape

path.

2.

Make

sure

the

deck

is

properly

set

for

the

voltage

in

your

local-

ity.

3.

In

general,

adjustments

and

checks

are

made

in

the

order

of

L-ch

then

R-ch.

Double

REF.

Nos.

and

test

point

designations

indicate

L-ch/R-ch.

(Example:

R11/R21)

Oscillator

Distortion

Analyzer

Attenuator

.

0

dB

is

referenced

to

0.775

V.

If

an

AC

voltmeter

thi

references

0

dB

to

1

V

is

used,

appropriate

compensation

should

be

made.

.

The

AC

voltmeter

used

in

the

procedures

must

hav@

an

input

impedance

of

1Mo

or

more.

.

Note

the

“deck

settings”

at

the

top

of

each

chart.

The

settings

apply

to

all

checks

for

a

specific

chart

unless

explicitly

stated

otherwise.

Oscilloscope

AC

Voltmeter

1kHz

Filter

LINE

IN

OUTPUT

Fig.

5-1

Basic

test

setup

Deck

settings:

LEVEL

cont.:

OFF

(depressed)

.

MONITOR

sw

TEAC

test

tapes:

{V-2RX

only):

TAPE

MTT-150:

For

Dolby

level

calibration

NR

SYSTEM

sw:

OUT

MTT-356:

‘For

playback

Lh

barten

4

response

TAPE

sw:

METAL

check

for

METAL,

Co

(CrO2)

5-1

PLAYBACK

PERFORMANCE

OUTPUT

cont.:

MAX

MTT-501:

For

S/N

check

with

NORMAL

ADJUST

MEASURING

ITEM

SETTING

INPUT

SIGNAL

(or

CHECK)

POINT:

RESULT

REMARKS

:

OUTPUT:

Refer

to

Fig.

.

REC-PLAY

MEDIC

eneee

Phase:

within

45°

5-5.

head

Connection:

Fig.

5-2

Azimuth

screw

|

OUTPUT:

azimuth

MTT-356

(12.5

kHz)

of

R-P

head

(Figs.

5-3,

5-4)

Max.

output

at

L-&

R-ch’s

(on

VTVM)

.

Specified

output

——

level

MTT-150

OUTPUT:

Spec.

output

R11/R21

~3.5

dB

(518

mV)

level

.

PEAK

PRO-

PEAK

PROGRAM

GRAM

LEVEL

—

MTT-150

R15/R25

LEVEL

METER:

METER

0dB

TAPE

sw:

METAL

If

10

kHz

output

is

lower

then

spec,

connect

C107

MTT-356

Check

OUTPUT:

Fig.

5-6

(C202)

in

parallel

with

C101

(C201)

on

REC/PLAY

AMPL

.

Frequency

PCB.

response

TAPE

sw:

NORMAL

MTT-356

OUTPUT:

At

10

kHz

should

be

approx.

Check

4

dB

higher

than

measured

in

above

step.

F i

Fully-erased

Ratio

of

spec.

.

Signal-to-noise

:

.

OUTPUT:

ratio

TAPE

sw:

NORMAL

MTT-501

tape:

Check

47

dB

min.

outp

ut

of

(Use

bulk

tape

eraser)

-3.5

dB

to

noise

Deck

settings:

eee

LEVEL

cont:

MONITOR

sw

5-2

MONITOR

PERFORMANCE

OUTPUT

cont.:

V-2RX/V~4RX

REC/PAUSE

mode

(V-4RX

only)

OFF

(depressed)

{V-2RX

only):

SOURCE

NR

SYSTEM

sw:

OUT

MAX

ITEM

SETTING

INPUT

SIGNAL

ADJUST

(or

CHECK)

MEASURING

POINT:

RESULT

REMARKS

MICROPHONE:

400

Hz/-67

dB

(346

pV)

OUTPUT:

~3.5

dB

+3

dB

(367

mV

~

731

mV)

MICROPHONE

min.

input

level

6.

Min,

input

level

RECORD

cont.:

Max.

LINE

IN:

400

Hz/-19

dB

(86.9

mv)

OUTPUT:

~3.5

dB

+3

dB

LINE

min.

input

level

LINE

IN:

400

Hz/-9

dB

(275

mV)

7.

Specified

LINE

Specified

setting

of

RECORD

cont.

RECORD

cont.

(L/R)

OUTPUT:

~-3.5

dB

(518

mV)

Connection:

Fig.

5-7

400

Hz/-9

dB

revel

(275

mv)

DECK

under

TEST

OUTPUT

AC

Voltmeter

Fig.

5-2

Test

setup

for

azimuth

check

REC

-

PLAY

head

Fig.

5-3

Azimuth

screw

location

(V-2RX)

REC/PLAY

head

azimuth

adjusting

screw

fixed

Fig.

5-4

Azimuth

screw

location

(V-4RX)

input

level

IMPORTANT:

Do

not

change

the

setting

of

the

RECORD

contro!

after

establishing

the

setting

as

above.

8.

PEAK

PRO-

LINE

IN:

PEAK

PROGRAM

GRAM

LEVEL

400

Hz/-9

dB

LEVEL

METER:

METER

(275

mV)

O

dB

+1

dB

9.

PHONES

output

LINE

IN:

PHONES:

~-15

dB

+3

dB

(97.5

mV

~

195

mV)

0°

(IN

PHASE)

45°

90°

180°

Fig.

5-5

Confirming

phase

relationship

TAPE

sw:

METAL

Tape:

MTT-356

V-4RXy

43

|

+2

a

a,

1

315

(dB)

—3

4

63k

10k

(Hz)

Fig.

5-6

Playback

frequency

response

>

AC

Voltmeter

DECK

under

TEST

PHONES

Fig.

5-7

Test

setup

for

PHONES

check

V-2RX/V-4RX

LEVEL

cont.:

OFF

(depressed)

MONITOR

sw

(V-2RX

only):

TAPE

RECORD

cont.:

Specified

position

(item

7)

NR

SYSTEM

sw:

OUT

TEAC

test

tapes:

BIAS

FINE

cont.

(

;

)

MTT-5072:

For

METAL

recorcel

test

(V-2RX

only):

O

(center

detent

position

MTT-5061:

For

Co

(CrO,)

record

test

5-3

RECORDING

PERFORMANCE

output

cont.:

MAX

MTT-501:

For

NORMAL

record

test

ADJUST

MEASURING

ITEM

SETTING

INPUT

SIGNAL

(or

CHECK)

POINT:

RESULT

Li

oy

LINE

IN:

(V-2RX

TP11/TP21

10.BIAS

trap

REC/PLAY

-

REC/PAUSE

No

signal

U104/U204

Min.

reading

(V-4RX)

1)

Adjust

in

the

order

of

steps

(2)

(3)

(4).

LINE

IN:

C155/C255

OUTPUT:

2)

TAPE

sw.:

METAL

400

Hz

&

6.3

kHz

(V-2RX)

Nearly

equal

Tape:

MTT-5072

alternately/-42

dB

|

C131/C231

level

at

both

:

{6.15

mV)

(V-4RX)

frequencies

2

LINE

IN:

OUTPUT:

11.

Record

bias

3)

TAPE

sw.:

Co

(CrO,)

400

Hz

&

6.3kHz

|

243

Nearly

equal

..

For

L-

&

Tape:

MTT-5061

alternately/-42

dB

|

© ~

""""

level

at

both

R-ch

(6.15

mv)

frequencies

LINE

IN:

OUTPUT:

4)

TAPE

sw.:

NORMAL

400

Hz

&

6.3

kHz

R12

Nearly

equal

..

For

L-

&

Tape:

MTT-501

alternately/-42

dB

|“

""""

level

at

both

R-ch

(6.15

mV)

frequencies

LINE

IN:

TAPE

sw.:

METAL.

OUTPUT:

Tape:

|

MTT-5072

Noe

R14/R24

-6.5

dB

(367

mV)

a

fi

LINE

IN:

OUTPUT:

12.

Record

level

TOEE

Ce

400

Hz/-12

dB

Check

-6.5

dB

#1.5

dB

ee

(195

mV)

(308

to

436

mv)

2

LINE

IN:

OUTPUT:

TAPE

sw.:

NORMAL

400

Hz/-12

dB

Check

-6.5

dB

+1.5

dB

Tape:

MTT-501

(195

mv)

13.

Total

harmonic

LINE

IN:

OUTPUT:

“di

torti

Same

as

12

above.

400

Hz/-12

dB

Check

1.8%

or

less

with

METAL,

Co

(CrO2)

eee

(195

mV)

2.0%

or

less

with

NORMAL

LINE

IN:

TAPE

sw.:

METAL

.

i

OUTPUT:

Tape:

MTT-5072

dicta

aol

al

Fig.

5-8

LINE

IN:

14.

Frequency

TAPE

sw.:

Co

(CrO,)

s

-

OUTPUT:

response

Tape:

MTT-5061

Se

ew

Check

Fig.

5-9

:

LINE

IN:

:

Me

owe

belles

Required

signal/

Check

ein

E18

pens

-42

dB

(6.15

mV)

a

If

frequency

response

is

out

of

specification,

recheck

#11.

‘Record

bias’.

LINE

IN:

400

Hz/-9

dB

TAPE

sw.:

METAL

OUTPUT:

Tape:

MTT-5072

(275

ee

Gheck

46

dB

min.

no

signal

LINE

te

eee

‘ ‘

400

Hz/-9

dB

atio

of

spec-

15.

Signal-to-noise

TAPE

sw.:

Co

(CrO,)

OUTPUT:

gs

ratio

Tape:

MTT-5061

oN

Check

46

dB

min.

ieeeu

anaes

no

signal

.

LINE

IN:

400

Hz/-9

dB

TAPE

sw.:

NORMAL

OUTPUT:

Tape:

MTT-501

aim

neal

45

dB

min.

no

signal

(2.

10