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TEAC.

SERVICE

MANUAL

V-66C

Stereo

Cassette

Deck

Effective:

September

1982

B-20125

5704015300

V-66C

1

SPECIFICATIONS

AND

SERVICE

DATA

SPECIFICATIONS

Track

system

4-track,

2-channel

stereo

2

Heads

erase

,

record/playback

Type

of

tape

Cassette

tape,

C-60

and

C-90

(Phillips

type)

Tape

speed

4.8

cm/s

(1-7/8

ips)

Input

(level

and

impedance)

MIC:

Specified

input

fevel:

-57

dB

(1.09

mV)/10

kohms

Minimum

input

level:

-67

dB

(346

»V)

LINE

IN:

Specified

input

level:

-9

dB

(275

mV)/50

kohms

Minimum

input

level:

-19

dB

(86.9

mV)

Output

(level

and

load

impedance)

OUTPUT:

Specified

output

level:

-3.5

dB

(518

mV)/50

kohms

PHONES:

Specified

output

level:

-17

dB

(109

mV)/8

ohms

Equalization

METAL:

3180us+

70us

Co

(CrO,):

3180

us+

7O0us

NORMAL:

3180

us

+

120

us

Head

configuration

1/2-track,

1-channel

erase

head

1/4-track,

2-channel

record/playback

Motor

1

DC

servo

motor

(for

capstan

drive)

1

DC

motor

(for

reel

drive)

Bias

frequency

100

kHz

Operation

position

Horizontal

Power

requirements

100/120/220/240

V

AC,

50/60

Hz,

25

W

(General

export

model)

-*

120

V

AC,

60

Hz,

25

W

(U.S.A./Canada

model)

220

V

AC,

50

Hz,

25

W

(Europe

model)

240

V

AC,

50

Hz,

25

W

(U.K./Australia

model)

Weight

6.0

kg

(13-4/16

Ibs.)

net

Dimensions

_.

mm

(11-1/4")

a

ae

432

mm

(17")

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

02-inch)

F.F.:

80

to

150

g-cm

(1.1

to

2.1

oz-inch)

REW:

80

to

150

g-cm

(1.1

to

2.1

0z-inch)

Fast

wind

time

90

sec.

for

MTT-501

(C-60)

Auto

end-stop

time

4

sec.

or

less

ELECTRICAL

Frequency

response

Playback:

See

Fig.

5-6.

Overall:

See

Fig.

5-8.

Signal-to-noise

ratio

Playback:

NORMAL:

46

dB

min.

Record/playback:

METAL,

Co

(CrO,):

45

dB

min.

NORMAL:

44 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

2.2%

or

less

with

METAL/Co

(CrO,)

2.0%

or

less

with

NORMAL

NOTES:

@

Improvements

may

result

in

SPECIFICATIONS

AND

SERVICE

DATA

changes.

@

Value

of

“dB”

in

the

data

refers

to

0

dB

(0.775

V),

except

where

specified.

e

Dolby

Noise

Reduction

System

is

manufactured

under

license

from

Dolby

Laboratories

licensing

Corporation.

“Dolby”

and

the

double-D

symbol

are

trademarks

of

Dolby

Laboratories

Licensing

Corporation.

CAUTION

4,

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

replacement.

V-66C

2

REMOVAL

OF

EXTERNAL

COMPONENTS

Disassemble

in

number-order

Fig.

2-1

V-66C

3

PARTS

LOCATION

POWER

TRANSFORMER

CONTROL

PCB

R/P

AMPL

PCB

i

|

ee

Ee

enemas

iy

POWER

SW

PCB

JOINT

PCB

SELECTOR

SW

PCB

VR

PCB

TIMER

SW

PCB

INPUT

SW

PCB

Fig.

3-1

Top

view

TAPE

COUNTER

PEAK

LEVEL

DISPLAY

LAMP

PCB

SENSOR

PCB

OPERATION

SW

PCB

Fig.

3-2

Front

view

RECORD

SAFETY

SWITCH

CASSETTE-IN

SWITCH

SENSOR

ARM

SENSOR

ARM

sé

ren

©

ERASE

HEAD

REC/PLAY

HEAD

PINCH

ROLLER

Fig.

3-3

Transport

front

view

TAPE

SPEED

CONTROL

CASSETTE-IN

SWITCH

RECORD

SAFETY

SWITCH

CAPSTAN

MOTOR

REEL

MOTOR

DAMPER

1

PAUSE

SOLENOID

JOINT

PCB

PLAY

SOLENOID

Fig.

3-4

Transport

rear

view

V-66C

V-66C

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.

If

adjustment

is

required,

adjust

the

position

of

the

play

solenoid.

capstan

shaft

pinch

roller

pinch

roller

arm

spring

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

0.3

—

0.5

mm

when

the

deck

is

in

the

pause

mode.

2.

If

adjustment

is

required,

adjust

the

position

of

the

pause

solenoid.

4-3.

PINCH

ROLLER

PRESSURE

1.

With

the

cassette

holder

shut

and

no

tape

loaded,

put

the

deck

in

the

play

mode

after

pushing

the

cassette-in

switch

sensor

arm

up-wards

and

holding

it.

2.

Hook

a

spring

scale

on

the

pinch

roller

assembly

as

shown

in

the

illustration,

3.

Pull

the

scale

downwards

until

there

is

sufficient

force

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

should

be

from

350

g

to

450

g

(12.3

oz.

to

15.9

02.)

Fig.

4-2

44

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

02-inch)

4-5

TAPE

SPEED

1.

Connect

a

frequency

counter

to

the

deck

as

shown

in

Fig,

4-3.

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

controi

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

LINE

IN

OUTPUT

Fig.

4-3

4-6

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.

4-3.

2.

Load

and

play

a

TEAC

MTT-111

test

tape.

3.

Check

that

the

reading

on

the

wow-and-flutter

meter

is

within

0.06%

(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

sectipn,

and

play

it.

6.

The

wow

and

flutter

should

not

be

more

than

0.25%

(RMS).

No

—

4-7

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

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

fight

grease

to

the

well

of

the

fly-

wheel

bearing.

N

capstan

flywheel

ass’y

Or

capstan

shaft

|

V-66C

4-8

VOLTAGE

CONVERSION

(GENERAL

EXPORT

MODELS

ONLY)

1.

Always

disconnect

the

power

line

cord

before

making

these

adjustments.

:

2.

Locate

the

voltage

selector

on

the

rear

panel

as

shown

in

the

illustration.

3.

Using

a

regular

screwdriver,

turn

the

selector

until

the

numerals

corresponding

to

the

required

voltage

appear.

|

100/120

220/240

Vv

oe

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:

R12/22)

Oscillator

Distortion

Analyzer

Attenuator

LINE

IN

OUTPUT

4.

OdB

is

referenced

to

0.775

V.

If

an

AC

voltmeter

that

references

0

dB

to

1

V

is

used,

appropriate

compensation

should

be

made.

5.

The

AC

voltmeter

used

must

have

an

input

impedance

of

1M-

ohms

or

more.

6.

Note

the

“Deck

settings”

at-the

top

of

each

chart.

The

settings

apply

to

all

checks

for

the

specific

chart

unless

explicitly

stated

otherwise.

Osciltoscope

AC

Voltmeter

1kHz

Filter

Fig.

5-1

Basic

test

setup

V-66C

Tr

vio1/70

Fig.

5-2

Adjustment

and

test

point

locations

V-66C

TEAC

test

tapes:

ee

MTT-150:

For

Dolby

level

calibration

Deck

settings:

MTT-356:

For

playback

frequency

response

TAPE

SELECTOR

sw:

METAL

‘

check

for

METAL,

Co

(CrO,

}

5-1

PLAYBACK

PERFORMANCE

DOLBY

NRIN/OUTsw:

OUT

=

MTT-501:

For

S/N

check

with

NORMAL

ADJUST

MEASURING

ITEM

SETTING

INPUT

SIGNAL

(or

CHECK)

POINT:

RESULT

REMARKS

OUTPUT:

Refer

to

MTT-150

Check

Phase:

within

45°

1.

REC/PLAY

head

Aca

hte

giao

ee

ieee

Nae

Sie

eR

ae

pe

pine

ee

ee

aL

Oe

en

ee

ad

azimuth

Connection:

Fig.

5-3

Azimuth

screw|

OUTPUT:

MTT-356

(12.5

kHz).

|

of

R/P

heads

Max,

output

at

L-

&

(Fig.

5-4)

R-ch's

(on

VTVM)

TP1/TP2

pizin22

387.5

mV

(-6

dB)

2.

Specified

output

:

~--

---

---

-

-

-

-

--e

----

level

ree

MENT

OUTPUT:

gare

cadres

Check

-3.5

dB

+1

dB

peas

(461

to

581

mV)

é

PEAK

LEVEL

3,

PEAK

LEVEL

oe

MTT-150

R14/R24

DISPLAY

DISPLAY

L

OdB

OUTPUT:

iF

MTT-356

Adjust

to

obtain

(315

Hz

&

10

kHz)

R11/R21

equal

output

at

——

315

Hz

and

10

kHz.

MTT-356

Check

Cee

|

4,

Frequency

[|

oo

ULL

ae

tte

we

ket

he

ee

De

Be

a

tee

ER

So

cen

Bl

St

response

OUTPUT:

At

10

kHz

should

‘

MTT-356

be

approx.

4

dB

TAPE

sw:

NORMAL

(10

kHz)

Check

higher

than

meas-

ured

in

METAL

position.

F

‘

Fully-erased

MTT-501

f

Ratio

of

spec.

.

fe

a

a

TAPE

sw:

NORMAL

tape

(Use

bulk

tape

Check

is

output

of

aus

:

—3.5

dB

to

noise)

Oscilloscope

DECK

under

TEST

R

OUTPUT

AC

Voltmeter

Fig.

5-3

Test

setup

for

azimuth

check

O°

(1N

PHASE)

45°

90°

Fig.

5-5

Confirming

phase

relationship

eraser)

azimuth

adjusting

screw

(dB)

180°

REC/PLAY

head

fixed

Fig.

5-4

Azimuth

screw

location

METAL

MTT-356

TAPE

SELECTOR:

tape:

+2

L

1

40

«663

Fig.

5-6

Playback

frequency

response

1

L

4

125

315

10k

(Hz)

V-66C

Deck

setting:

DOLBY

NH

IN/OUT

sw.:

OU

5-2

MONITOR

PERFORMANCE

INPUT

sw.:

rat

INE

ADJUST

MEASURING

ITEM

SETTING

INPUT

SIGNAL

(or

CHECK)

POINT:

RESULT

Mic:

OUTPUT:

_

400

Hz/-67

dB

~3.5

dB

+3

dB

MIC

min.

input

RECORD

(346

nV)

(367

to

731

mV)

cont.:

Max.

LINE

IN:

papa

400

Hz/-19

dB

-3.5

dB

+3

dB

:

(86.9

mV)

(367

to

731

mV)

input

level

.

Min.

input

level

INPUT

sw.:

LINE

LINE

IN:

Specified

setting

400

Hz/-9

dB

elaine

(6

ap)

|

of

RECORD

(275

mv)

:

.

Specified

LINE

input

level

LINE

IN:

OUTPUT:

400

Hz/—9

dB

-3.5

dB

+1

dB

(275

mV)

(461

to

581

mV}

Headphone

LINE

IN:

PHONES:

out

i

level!

Connection:

Fig.

5-7

400

Hz/-9

dB

-17

dB

+3

dB

8

ohm

load

=

(275

mV)

(77.5

to

155

mV)

LINE

IN:

PEAK

LEVEL

;

PEAK

LEVEL

400

Hz/-9

dB

DISPLAY

D

(275

mV)

0dB

+1

dB

AC

Voltmeter

DECK

under

ead

PHONES

oO

Fig.

5-7

Test

setup

for

headphone

check

MTT-5072

(METAL)

MTT-5061

(Co

(CrO,

))

DOLBY

B,C

TYPE

(dB)

MTT-501

(NORMAL)

J

DOLBY

C

TYPE

Gf

1

es

as

wae

|

a

a

40

63

125

400

4k

6.3k

10k

14k

(Hz)

Fig.

5-8

Overall

frequency

response

10