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TEAC.

SERVICE

MANUAL

—C-3RX

Stereo

Cassette

Deck

|

Effective:

June,

1981

B10049

,

5704010000

G3RX

1

SPECIFICATIONS

AND

SERVICE

DATA

NOTES:

1.

Improvements

may

result

in

changes

in

specifications

and

service

data.

2.

0

dB

is

referenced

to

0.775

V

in

this

manual.

SPECIFICATIONS

Track

System

4-track,

2-channel

stereo

Heads

3:

Erase,

record

and

playback

Type

of

Tape

Cassette

tape,

C-60

and

C-90

(Philips

type)

Tape

Speed

4.75

cm/s

(1-7/8

ips)

Input

(level

and

impedance)

:

MIC:

Specified

input

level:

—57

dB

(1.09

mV)/10k

ohms

Minimum

input

level:

—67

dB

(346

uV)

LINE

IN:

Specified

input

levei:

—9

dB

(275

mV)/50k

ohms

Minimum

input

level:

—19

dB

(86.9

mV)

Output

(level

and

impedance)

OUTPUT:

Maximum

output

level:

—2.5

dB

(581

mV)/50k

ohms

Specified

output

level:

—5

dB

(436

mV)

PHONES:

Specified

output

level:

—15.8

dB

(126

mV)/8

ohms

Equalization

METAL:

3180

us+

70

us

CO

(Cr0,):

3180

us

+

70

us

NORMAL:

3180

us

+

120

us

Head

Configuration

1/2-track,

1-channel

erase

head

1/4-track,

2-channel

record

head

and

playback

head

in

a

single

housing

Motors

1

FG

servo

capstan

DC

motor

1

DC

reel

motor

Bias

Frequency

100

kHz

+5

kHz

Operation

Position

Horizontal

Power

Requirements

100/120/220/240

V

AC,

50/60

Hz,

41

W

(General

export)

120

V

AC,

60

Hz,

41

W

(U.S.A./Canada)

220

V

AC,

50

Hz,

41

W

(EUR)

240

V

AC,

50

Hz,

41

W

(U.K./Australia)

Weight

9.5

kg

(20-15/16

Ibs.)

net

Dimensions

See

Fig.

3-2

*

Dolby

Noise

Reduction

System

manufactured

under

Jicense

from

Dolby

Laboratories

Licensing

Corporation.

‘Dolby’

and

the

double-D

symbol

are

trademarks

of

Dolby

Laboratories

Licensing

Corporation.

**

dbx

Noise

Reduction

System

made

under

license

from

dbx,

Incorporated.

The

name

dbx

and

the

dbx

symbol

are

trade-

marks

of

dbx,

Incorporated.

SERVICE

DATA

MECHANICAL

Tape

Speed

Deviation

3,000

Hz

+45

Hz

Tape

Speed

Drift

30

Hz

Wow

and

Flutter

Playback:

0.08%

(WRMS)

Record/playback:

0.25%

(RMS)

Pinch

Roller

Pressure

390

g

to

490

g

(13.8

02

to

17.3

02.)

Reel

Torque

Takep-up:

45

to

65

g-cm

(0.62

to

0.90

oz-inch)

Supply:

3

to

8

g-cm

(0.042

to

0.11

02-inch)

F.F.&

REW:

90

to

160

g-cm

(1.25

to

2.22

oz-inch)

Fast

Winding

Time

90

seconds

for

MTT-501

(C-60)

ELECTRICAL

Frequency

Response

See

Figs.

5-5,

5-7

and

5-8

Signal-to-noise

Ratio

Playback:

METAL,

Co

(CrO,):

52

dB

min.

NORMAL:

48

dB

min.

Overall:

METAL,

Co

(CrO,):

48

dB

min.

NORMAL:

45 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

35

dB

min.

(NR

-

QUT),

50

dB

min.

(NR

-

dbx**)

at

1

kHz.

Adjacent

Track

Crosstalk

40

dB

min.

at

125

Hz

Total

Harmonic

Distortion

2.0%

or

less

(NR

-

OUT),

1.5%

or

less

(NR

-

dbx)

with

NORMAL,

Co

(Cr0.)

and

METAL

tapes

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

replacement.

2

PARTS

LOCATION

POWER

TRANSFORMER

REMOTE

PCB

ASSY

DBX

PCB

ASSY

POWER

SUPPL

PCB

ASSY

JOINT

PCB

ASSY

=

i

REEL

MOTOR

CAPSTAN

MOTOR

REC/PLAY

LEVER

SWITCH

AMPL.

PCB

ASSY

PCB

ASSY

Fig.

2-1

SUPPLY

TAKE-UP

COUNTER

REEL

MOTOR

REEL

TABLE

REEL

TABLE

CAPSTAN

FAST-FORWARD

PINCH

ROLLER

ERASE

HEAD

PINCH

ROLLER

CASSETTE

MOTOR

SOLENOID

SOLENOID

HOLDER

TENSION

ARM

REC/PLAY

HEAD

HEAD

BASE

SOLENOID

Fig.

2-2

Fig.

2-3

H

i

]

3

C-3RX

3

REMOVAL

OF

EXTERNAL

COMPONENTS

Disassemble

in

number-order

LIMITED

AREA

Broken

line

indicates

the

dimensions

of

some

general

export

models.

Fig.

3-2

Dimensions

Fig.

3-1

|

C-3RX

|

4

MECHANICAL

ADJUSTMENTS

AND

CHECKS

4-1

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:

45

to

65

g-cm

(0.62

to

0.90

oz-inch)

Supply:

3

to

8

g-cm

(0.042

to

0.11

oz-inch)

F.F.and

REW:

90

to

160

g-cm

(1.25

to

2.22

0z-inch)

4-2

PINCH

ROLLER

PRESSURE

1.

With

the

cassette

holder

shut

and

no

tape

loaded,

put

the

deck

in

PLAY

mode.

2.

Hook

a

spring

scale

on

the

tap

of

the

pinch

roller

assembly

plate,

as

shown

in

the

illustration.

3.

Pull

the

scale

down

until

there

is

sufficient

force

to

separate

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

390

g

to

490

g

(13.8

oz.

to

17.3

02.)

5.

If

the

pressure

is

not

within

the

prescribed

specifications,

it

may

be

adjusted

by

first

removing

the

pinch

roller

spring

from

the

pinch

roller

assembly

and

then

bending

the

spring

as

shown

in

the

illustration.

stronger

stronger

KZ

y

weaker

Fig.

4-1

4-3

HEAD

BASE

PLATE

POSITIONING

1.

Set

the

deck

in

the

PLAY

mode.

, ;

2.

Push

the

head

base

plate

by

hand

in

the

direction

of

the

arrow

and

check

that

the

head

base

plate

and

the

stopper

portion

of

the

mechanism

chassis

make

contact.

3.

If

there

is

any

clearance,

loosen

the

two

screws

on

the

head

base

plate

solenoid

and

reposition

the

solenoid

until

the

clearance

is

eliminated.

Head

base

plate

Stopper

portion

of

mechanical

chassis

There

should

be

no

clearance

at

this

point.

Push

by

hand

T-1554-1

when

in

PLAY

mode

23

Fig.

4-2

Screws

Head

Base

Solenoid

Fig.

4-3

Head

base

solenoid

location

4-4

CAPSTAN

ASSEMBLY

THRUST

1.

Turn

the

thrust

adjusting

screw

so

that

thrust

of

the

capstan

shaft

is

within

0.05

mm

to

0.15

mm.

Thrust

play

0.05

mm

to

0.15

mm

ily

—)|__ez

Ue

J

Thrust

adjusting

screw

Flywheel

i

|

|

|

:

|

C-3RX

4-5

TAPE

SPEED

1.

2.

Connect

a

frequency

counter

to

the

deck

as

shown

in

Fig.

4-5.

Play

a

tape

for

about

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

from

the

beginning.

While

the

tape

is

playing,

use

a

common

slotted

screwdriver

with

the

handle

completely

insulated

from

the

blade,

and

adjust

the

control

on

the

capstan

motor

(as

far

as

possible)

for

a

reading

of

3000

Hz

(£5

Hz)

on

the

frequency

counter.

.

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

+45

Hz

from

3000

Hz,

nor

drifts

more

than

30

Hz

at

any

given

time.

.

!f

the

tape

speed

is

not

within

the

prescribed

specifications,

check

the

pinch

roller

pressure

and

the

tape

transport

mechan-

ism

for

any

abnormality,

and

make

sure

the

tape

path

is

clean.

Frequency

Counter

Oscillator

Wow

&

Flutter

Meter

DECK

[_—_—_junder

TEST

{R

(

LINE

IN

)

OUTPUT

Fig.

4-5

Tape

speed

control

Fig.

4-6

Tape

speed

adjustment

location

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.

4-5.

2.

Load

and

play

a

TEAC

MTT-111

test

tape.

3.

Check

that

the

reading

on

the

wow-and-flutter

meter

is

within

0.08%

(WRMS).

2)

SIMULTANEOUS

RECORD/PLAYBACK

METHOD

STANDARD

Speed

4.

Load

a

TEAC

MTT-501

test

tape

(blank)

and

record

a

3000-Hz

signal.

5.

With

the

MONITOR

switch

in

the

TAPE

position,

note

the

read-

ing

on

the

wow-and-flutter

meter,

it

should

not

be

more

than

0.25%

(RMS).

3)

NON-SIMULTANEOUS

RECORD/PLAYBACK

METHOD

6.

Rewind

the

tape

to

the

beginning

of

the

recorded

section

pre-

viously

made

in

step

4,

and

play

it.

7.

The

wow

and

flutter

should

not

be

more

than

0.25%

(RMS).

4-7

MICROSWITCH

(A)

ASSEMBLY

CLEARANCE

1.

Insert

a

blank

cassette

and

close

the

cassette

holder.

2.

Loosen

the

two

screws

on

the

microswitch

(A).

3.

Move

the

switch

so

that

actuator

of

the

switch

contacts

the

safe-

ty

lever.

4.

Adjust

the

switch

position

to

obtain

a

clearance

of

between

0.1

mm

to

0.3

mm.

5.

Retighten

the

screws,

Safety

lever

Blank

cassette

(

T-1556

0.1

mm

to

0.3

mm

clearance

Actuator

Safety

lever

Bent

tip

of

switch

bracket

Fig.

4-7

4-8

MICROSWITCH

(B)

ASSEMBLY

CLEARANCE

1.

2.

3.

Push

the

EJECT

button

to

open

the

cassette

holder.

Loosen

the

two

screws

on

the

microswitch

(B).

Move

the

switch

so

that

switch

actuator

contacts

the

bent

pro-

jecting

portion

of

the

eject

lever.

.

Adjust

the

switch

position

to

obtain

a

clearance

of

approximate-

ly

1

mm.

Retighten

the

screws.

—

Actuator

earance

of

rox.

7mm

Fig.

4-8

C-3RX

4-9

LUBRICATION

:

Lubrication

is

only

required

when

parts

are

replaced.

For

this

pur-

pose,

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

light

grease

to

the

well

of

the

fly-

wheel

bearing.

Capstan

Flywheel

Ass’y

Well

of

Flywheel

Bearing

Capstan

Shaft

Capstan

Housing

Fig.

4-9

4-10

VOLTAGE

SELECTION

(FOR

GENERAL

EXPORT

MODELS)

1.

Always

disconnect

the

power

line

cord

before

making

these

adjustments.

2.

Remove

the

top

cover

of

the

deck

by

removing

the

screws

from

the

sides.

3.

Locate

the

voltage

selector,

shown

in

the

illustration,

to

the

front

of

the

power

transformer.

4.

Loosen

the

two

screws

in

the

jumper

bar

and

move

the

bar

so

that

it

jumpers

the

opposing

terminals

marked

with

the

required

voltage

(100,-120,

220

or

240).

5.

Retighten

the

screws

and

replace

the

top

cover.

4-11

AC

POWER

LINE

FREQUENCY

Since

the

C-3RX

uses

a

DC

servo

motor,

50

Hz

or

60

Hz

operation

is

permitted

without

any

change

in

power

line

frequency.

Jumper

bar

Fig.

4-10

C-3RX

|

5

ELECTRICAL

ADJUSTMENTS

AND

CHECKS

PRECAUTIONS

1.

Before

beginning

any

checks

or

adjustments,

clean

and

demag-

netize

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

designations

indi-

cate

L-ch/R-ch.

(Example:

R11/R21)

4.

For

this

deck,

0

dB

is

referenced

to

0.775

V.

If

you

are

using

an

AC

voltmeter

which

references

0

dB

to

1

V,

appropriate

com-

pensation

should

be

made.

5,

The

AC

voltmeter

used

in

the

procedures

must

have

an

input

impedance

of

1M

ohms

or

more.

6.

Note

the

“Deck

settings”

at

the

top

of

each

chart.

These

settings

must

be

used

for

all

the

checks

in

each

chart

unless

explicitly

stated

otherwise.

OSCILLATOR

pistORTION

ANALYZER

ATTENUATOR

LINE

IN

—70

dB

or

more...

.

What

does

it

mean?

In

reference

to

some

specifications,

you

may

come

across

an

expres-

sion

like:

“—70

dB

or

more”.

This

means

that

the

lower

the

value

of

this

specification,

the

greater

the

absolute

value

of

the

specifica-

tion

and

the

better

the

performance

of

the

deck.

For

instance,

a

noise

floor

of

—76

dB

is

better

than

—70

dB,

because

this

means

that

the

level

of

noise

is

lower.

So

in

this

case,

“—70

dB

or

more”

means

at

least

as

good

a

value

as

—70

dB

and

maybe

even

better,

i.e.,

-71

dB.

OSCILLOSCOPE

AC

Voltmeter

OUTPUT

Fig.

5-1

Basic

test

setup

OSCILLOSCOPE

AMP

SPKR

DECK

:

under

TEST

AC

Voltmeter

OUTPUT

T-813

Fig,

5-2

Test

setup

for

azimuth

check

REC-PLAY

Head

Height/Tilt

Adjusting

Screw

Azimuth

Adjusting

Nut

T-I769

Fig.

5-3

Azimuth

adj.

nut

location

C-3RX

Deck

settings:

TEAC

test

tapes:

MONITOR

sw.:

TAPE

MTT-150:

For

Dolby

level

calibration

NR

SYSTEM

sw.:

OUT

MTT-316:

For

playback

frequency

response

EQ

sw.:

METAL

check

for

METAL,

Co(Cr0,)

5-2

PLAYBACK

PREFORMANCE

;

MTT-216:

For

playback

response

check

for

NORMAL

MEASURING

ADJUST

POINT:

ITEM

SETTING

INPUT

SIGNAL

(or

CHECK)

RESULT

OUTPUT:

Phase:

about

0°

on

‘scope

(Fig.

5-4)

®

Max.

output

on

VTVM

OUTPUT:

Phase:

45°

min.

(315

Hz)

90°

min.

(12.5

kHz)

Conn.:

Fig.

5-2

Azimuth

nut

of

R-P

heads

{Fig.

5-3)

1.

REC/PLAY

head

azimuth

OUTPUT

cont.:

convenient

output

level

position

pan

neon

“

MTT-150

MTT-316

(12.5

kHz)

;

TP1/TP2:

—2.5

dB

(581

mV)

®@

Spec.

setting

of

OUTPUT

cont.

@

Spec.

output

level

OUTPUT:

—5

dB

(436

mV)

3.

Specified

output

level

EQ:

METAL,

Co(CrO,)

Adjust

for

10

kHz

signal

at

same

level

as

ref.

signal

(315

Hz)

5.

Frequency

response

|

-

-

-

~~

---

---~-~-4------------}-~-----—--|--

---------

OUTPUT:

At

10

kHz,

should

be

3

dB

to

6dB

higher

than

measured

in

above

step.

OUTPUT:

R10/R20

Fig

55

EQ:

NORMAL

MTT-316

Fully-erased

tape:

OUTPUT:

:

{Use

bulk

tape

eraser)

}

:

Ratio

of

spec.

6.

Signal-to-noise

ratio

}EQ:

METAL

.....

etree

ys

.

METAL

......

52

dB

min.

output

of

Co{CrO.)

..

2.2.2...

.

MTT-5061.....

—5

dB

to

noise

NORMAL

.........

.

MTT-501

.....

..48dB

min.

EQ:

NORMAL

Tape:

MTT-216

EQ:

METAL,

Co{CrO2)

(

Tape:

MTT-316

+

N

0°

(IN

PHASE)

45°

90°

180°

RESPONSE

IN

dB

n

FREQUENCY

IN

Hz

Fig.

5-4

Confirming

phase

relationship

Fig.

5-5

Playback

frequency

response

C-3RX

Deck

settings:

NR

SYSTEM

sw.:

OUT

REC-PAUSE

.node

INPUT

sw.:

LINE

5-2

MONITOR

PERFORMANCE

MONITOR

sw.:

SOURCE

OUTPUT

cont.:

Specified

position

(item

3)

MEASURING

POINT:

ADJUST

(or

CHECK)

ITEM

SETTING

INPUT

SIGNAL

RESULT

MIC:

OUTPUT:

400

Hz/—67

dB —5

dB

43

dB

(346

nV)

(308

mV

to

615

mV)

|

LINE

IN:

ouTpuT;

|...

|

Me

sw.

|

“400

Hz/—19

dB

—5

dB

43

oB

(86.9

mV)

(308

mV

to

615

mV)

RECORD

cont.:

Max.

7.

Min.

input

level

input

level

LINE

IN:

.

Specified

set-

400

Hz/—9

dB

Rae

te

oe

psec

ting

of

RE-

(275

mV)

CORD

cont.

8.

ants

specified

input

LINE

IN:

DOLBY

TP

(TP1/TP2):

400

Hz/—9

dB

Check

—2,.5dB

+0.5dB

(275

mV)

(548

mV

to

615

mV)

IMPORTANT:

Do

not

change

the

setting

of

the

RECORD

or

OUTPUT

controls,

after

establishing

their

setting

as

above.

LINE

IN:

¥

400

Hz/—9

dB

Check

eee

(275

mV)

=

LINE

IN:

10,

“TEST

IN”

INPUT

sw.:

TEST

400

Hz/—29

dB

Check

oo

rege

meter:

(27.5

mV)

at

:

LINE

IN:

PHONES:

11.

PHONES

output

|

Connection:

Fig.

5-6

400

Hz/—9

dB

Check

—15.8

dB

+3

dB

level

(275

mV)

(89.0

mV

to

178

mV)

9.

PEAK

LEVEL

meter

AC

Voltmeter

Deck

settings:

MONITOR

sw.:

TAPE

NR

SYSTEM

sw.:

OUT

INPUT

sw.:

LINE

ADJUST/PRE-SET

sw.:

PRE-SET

DECK

under

TEST

OUTPUT

cont.:

Specified

position

(item

3)

SROnES

ao

RECORD

cont.

(L/R):

Specified

position

(item

8)

Zao

:

TEAC

test

tapes:

.

Fig.

5-6

Deane

pious

ok

MTT-5061:

For

record

test

with

Co(Cr0,)

:

MTT-501:

For

record

test

with

NORMAL

5-3

RECORDING

PERFORMANCE

MTT-5072:

For

record

test

with

METAL

MEASURING

ADJUST

POINT:

SETTING

INPUT

SIGNAL

(or

CHECK)

RESULT

BIAS

TRAP

TP

LINE

IN:

'

12.

BIAS

tra

Record-pause

mode

F

L104/L204

(TP3/TP4):

i

No

signal

Min.

reading

LINE

IN:

.

OUTPUT:

BIAS,

EQ:

METAL

400Hz

&

10

kHz

R15/R25

Nearly

equal

tevel

Tape:

MTT-5072

ae

dl

dB

at

both

frequencies

.

LINE

IN:

OUTPUT:

13,

Record:bias

BIAS,

EQ:

Co(CrO2)

400

Hz

&

10

kHz

R14/R24

Nearl

.

°

’

y

equal

level

Tape:

MTT-5061

wie

dB

at

both

frequencies

~

|

LINE

IN:

BIAS,

EQ:

NORMAL

400

Hz

&

10

kHz

heey

aie

Tape:

MTT-501

ica

42

dB

at

both

frequencies