Teac C-3X Manuale utente

TEAC.

SERVICE

MANUAL

C-3X

Stereo

Cassette

Deck

Effective:

October,

1980

BO0113

|

5

704006800

NOTES:

1

SPECIFICATIONS

AND

SERVICE

DATA

1.

Improvements

may

result

in

changes

in

specifications

and

service

data.

2.

OdB

is

referenced

to

0.775

V

in

this

manuai

unless

otherwise

specified.

3.

Ail

the

electrical

numeral

values

are

for

STANDARD

speed

unless

otherwise

specified.

SPECIFICATIONS

Track

System

4-track,

2-channel

stereo

Heads

3:

Erase,

record

and

playback

Type

of

Tape

Cassette

tape,

C-60

and

C-90

(Phitips

type)

Tape

Speed

4.75

cm/s

(1-7/8

ips},

9.5

cm/s

(3-3/4

ips)

input

(level

and

impedance)

MIC:

Specified

input

level:

—57

dB

(1.09

mV)/10k

ohms

Minimum

input

level:

—67

dB

(346

»V)

LINE

IN:

Specified

input

level:

—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

ar

ee

3180

us

+

70

us

319015

70

Head

Configuration

1/2-track,

1-channel

erase

head

1/4-track,

2-channel

record

head

and

playback

head

in

a

single

housing

Votors

1

DC

servo

capstan

motor

1

OC

reel

motor

Bias

Frequency

100

kHz

+5

kHz

Operation

Position

Horizontal

Power

Requirements

100/117/220/240

V

AC,

50/60

Hz,

41

W(General

export

model)

117

VAC,

60

Hz,

41

W(U.S.A/Canada

model)

220

V

AC,

50

Hz,

41

W(Europe

model)

240

V

AC,

50

Hz,41

W(U.K./Australia

model}

Neight

§

kg

(19-3/16

ibs.)

net

Jimensions

See

Fig.

3-2

STANDARD

Noise

Reduction

System

and

Headroom

Extension

System

manufactured

under

license

from

Dolby

Laboratories

Licensing

Corporation.

‘Dolby’

and

the

double-D

symbol

are

trademarks

of

Dotby

Laboratories

Licensing

Corporation.

bx

noise

reduction

system

made

under

license

from

dbx,

incorpo-

ated.

The

word

dbx

and

the

Symbol

are

trademarks

of

dbx,

ncorporated.

.

t

SERVICE

DATA

MECHANICAL

Tape

Speed

Deviation

3,000

Hz

+45

Hz

Tape

Speed

Drift

30

Hz

Wow

and

Flutter

HIGH

STANDARD

0.065%

(WRMS)

|

0.08%

(WRMS)

0.18%

(RMS)

|

_

0.26%

(RMS)

Pinch

Roller

Pressure

390

g

to

490

g

(13.8

02

to

17.3

02.)

Reel

Torque

{at

STANDARD

speed)

Take-up:

45

to

65

g-cm

(0.625

to

0.903

02-inch}

Supply:

3

to

8

g-cm

(0.0417

to

0.111

oz-inch)

F.F.&

REW:

90

to

160

g-cm

(1.25

to

2.22

02-inch)

Fast

Winding

Time

$0

seconds

for

MTT-501

(C-60)

Piayback

Record/playback

ELECTRICAL

Frequency

Response

See

Figs.

5-9

to

5-13.

Signal-to-noise

Ratio

Playback

Better

than:

METAL,

Co(CrO,)

NORMAL

Overall

Better

than:

STANDARD

48

dB

45

dB

S/N

is

improved

by

5

dB

at

1

kHz

and

10

dB

above

5

kHz

when

Dolby

NRA*

is

used.

METAL,

Co(Cr0,)

NORMAL

Erase

Efficiency

65

dB

min.

at

1

kHz

(measured

with

input

10

dB

higher

than

the

specified

input

level)

Channel

Separation

35

dB

min.

at

1

kHz

Adjacent

Track

Crosstalk

40 dB

min.

at

125

Hz

Total

Harmonic

Distortion

2.0%

or

less

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

TEAL

Parts

List

and

oncure

oxart

renlaromont.

—

ea

VA

2

PARTS

LOCATION

POWER

TRANSFORMER

REMOTE

PCB

ASSY

IN/OUTPUT

PCB

ASSY

POWER

SUBRIy

PCB

ASSY

REEL

MOTOR

SUPPLY

TAKE-UP

COUNTER

REEL

TABLE

REEL

TABLE

_

him

ni

ini

tnd

einai

an

|

ERASE

HEAD

TENSION

ARM

PINCH

ROLLER

REC/PLAY

HEAD

CASSETTE

HOLDER

Fig.

2-2

CAPSTAN

MOTOR

REC/PLAY

AMPL.

PCB

ASSY

IN/OUTPUT

PCB

ASSY

_

soe

|

Pl

Psetcabe

Le

i:

LEVER

SWITCH

PCB

ASSY

Fig.

2-1

REEL

MOTOR

FAST

FORWARD

SGLENOID

HEAD

BASE

SOLENOID

CAPSTAN

MOTOR

PINCH

ROLLER

SOLENOID

Fig.

2-3

3

REMOVAL

OF

EXTERNAL

COMPONENTS

Disassemble

in

number-order

%

ei

=

:

i

Eis

sae

eae

eee

en

ee

|

i

Sa2ren

116"),

|

Broken

line

indicates

some

General

Export

models.

Fig.

3-2

Dimensions

Fig.

3-1

LIMITED

AREA

|

(3x

4

MECHANICAL

ADJUSTMENTS

AND

CHECKS

Note:

All

checks

and

adjustments

are

made

with

the

SPEED

switch

set

to

STANDARD,

unless

otherwise

indicated.

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

ta

0.90

02-inch)

Supply:

3

to

8

g-cm

(0.042

to

0.11

oz-inch)

F.F.and

REW:

90

to

160

9-cm

(1.25

to

2.22

oz-inch)

4-2

PINCH

ROLLER

PRESSURE

1.

With

the

cassette

hoider

shut

and

no

tape

loaded,

put

the

deck

in

PLAY

mode.

.

Hook

a

spring

scale

on

the

top

of

the

pinch

roller

assembly

plate,

as

shown

in

the

illustration.

.

Pull

the

scale

down

until

there

is

sufficient

force

to

separate

the

pinch

roller

from

the

capstan

shaft.

.

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.)

.

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

a

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

unti!

the

clearance

is

eliminated.

Head

base

plate

Stopper

portion

of

mechanical

chassis

There

should

be

no

clearance

at

this

point.

ae,

Push

by

hand

T-1554-1

when

in

PLAY

mode

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

piay

0.05

mm

to

0.15

mm

—_—>

Thrust

adjusting

screw

Fiywheei

Fig.

4-4

4-5

TAPE

SPEED

STANDARD

speed

1.

Connect

a

frequency

counter

to

the

deck

as

shown

in

Fig.

4-5.

2.

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.

3.

While

the

tape

is

playing,

use

a

common

slotted

screwdriver

with

the

handle

completely

insulated

from

the

blade,

and

adjust

the

control

on

the

MOTOR

PCB

(as

far

as

possible)

for

a

reading

of

3000

Hz

(Spec.

3000

Hz

+5

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

+45

Hz

from

3000

Hz,

nor

drifts

more

than

30 Hz

at

any

given

time.

HIGH

speed

5.

Set

the

deck

to

HIGH

speed

and

follow

all

the

procedures

described

above.

Since

the

speed

is

doubled,

all

the

values

described

in

the

preceding

steps

are

also

doubled

to

be

cam-

patible.

§.

If

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

&

Fiutter

Meter

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

STANDARD

Speed

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).

HIGH

Speed

6.

Repeat

the

above

procedures

with

the

deck

set

to

HIGH

speed.

The

wow

and

flutter

should

not

be

more

than

0.18%

{RMS}.

3)

NON-SIMULTANEOUS

RECORD/PLAYBACK

METHOD

STANDARD

Speed

7.

Rewind

the

tape

to

the

beginning

of

the

recorded

section

pre-

viously

made

in

step

4,

and

play

it

at

STANDARD

speed.

8.

The

wow

and

flutter

should

not

be

more

than

0.25%

(RMS).

HIGH

Speed

9.

Rewind

the

tape

to

the

beginning

of

the

portion

previously

recorded

in

and

play

it

at

HIGH

speed.

The

wow

and

flutter

should

not

be

more

than

0.18%

(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

contracts

the

safety

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

Biank

cassette

tape

0.1

mm

to

0.3

mm

clearance

Actuator

!

Safety

iever

Bent

tip

of

switch

bracket

Fig.

4-7

4-8

MICROSWITCH

(B)

ASSEMBLY

CLEARANCE

1.

Push

the

EJECT

button

to

open

the

cassette

holder.

2.

Loosen

the

two

screws

on

the

microswitch

(B).

3.

Move

the

switch

so

that

switch

actuator contacts

the

bent

pro-

jecting

portion

of

the

eject

lever.

4.

Adjust

the

switch

position

to

obtain

a

clearance

of

approximate-

ly

1

mm.

5.

Retighten

the

screws.

AS

CE

\

Actuator

=”

Clearance

of

approx.

1mm

|

Switch

Housing

Fig.

4-8

|

VA

4-9

LUBRICATION

Lubrication

is

only

required

when

parts

are

replaced,

For

this

pur-

pose,

use

the

ail

and

grease

specified

below.

Oil:

TEAC

spindle

oil

(from

TEAC

TZ-255

oii

kit),

Mobil

B.T.E.

Of

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

‘0

Weil

of

Flywheel

Bearing

|

Apply

a

drop

of

oil

here.

Capstan

Housing

Fig.

4-9

4-10

VOLTAGE

SELECTION

(FOR

GENERAL

EXPORT

MGDELS)

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

(in

front

of

the

power

transformer).

4.

Loosen

the

two

screws

in

the

shorting

bar

and

move

the

bar

so

.

that

it

jumpers

the

opposing

terminals

marked

with

the

required

voltage

(100,

117,

220

or

240).

5.

Retighten

the

screws

and

replace

the

top

cover.

4-11

AC

POWER

LINE

FREQUENCY

Since

the

C-3X

uses

a

DC

servo

motor,

50

Hz

or

60

Hz

operation

is

permitted

without

any

change

in

power

fine

frequency.

Shorting

Bar

Fig.

4-10

C-3X

5

ELECTRICAL

ADJUSTMENTS

AND

CHECKS

PRECAUTIONS

1.

Before

beginning

any

checks

or

adjustments,

clean

and

demag-

|

~70

4B

or

more.

.

What

does

it

mean?

netize

the

entire

tape

path.

In

reference

to

some

specifications,

you

may

come

across

an

expres-

2.

Make

sure

the

deck

is

properly

set

for

the

voltage

in

your

sion

fike:

“—70

dB

or

more”.

This

means

that

the

lower

the

value

jocality.

of

this

specification,

the

greater

the

absolute

value

of

the

specifica-

3.

In

general,

adjustments

and

checks

are

done

in

the

order

of

L-ch

tion

and

the

better

the

performance

of

the

deck.

For

instance,

a

then

R-ch.

Double

REF.

NOs,

and

test

point

designations

indi-

noise

floor

of

—76

dB

is

better

than

—70

dB,

because

this

means

cate

L-ch/R-ch.

that

the

level

of

noise

is

lower.

So

in

this

case,

“~70

dB

or

more”

(Example:

R11/R21)

means

at

least

as

good

a

value

as

—70

dB

and

maybe

even

better,

4.

For

this

deck,

0

dB

is

referenced

to

0.775

V.

If

you

are

using

an

i.e.,

—-71

dB.

AC

voltmeter

which

references

0

d8

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

he

used

for

all

the

checks

in

each

chart

unless

explicitly

stated

otherwise.

OSCILLOSCOPE

OSCILLATOR

DISTORTION

ANALYZER

Oo

ieee

ie)

@®

ee

eee

©

°

AC

Voltmeter

ATTENUATOR

LINE

IN

OUTPUT

Fig.

5-1

Basic

test

setup

REC-PLAY

Head

OSCILLOSCOPE

AMP

SPKR

Height/Tilt

Adjusting

Screw

Azimuth

OUTPUT

AC

Voltmeter,

..,

Adjusting

Nut

T-1769

Fig,

5-2

Test

setup

for

azimuth

check

Fig.

5-3

Azimuth

adj.

nut

location

|

ws

wm

Deck

settings:

TEAC

test

tapes:

MONITOR

sw.:

TAPE

MTT-150:

For

Dolby

level

calibration

NR

SYSTEM

sw.:

OUT

MTT-316:

For

playback

frequency

response

SPEED

sw.:

STANDARD

check

for

METAL,

Co(Cr0,)

5-1

PLAYBACK

PERFORMANCE

-

EO

sw.:

METAL

MTT-216:

For

playback

response

check

for

NORMAL

MEASURING

ADJUST

POINT:

{or

CHECK)

ITEM

SETTING

INPUT

SIGNAL

Conn.:

Fig.

5-2

RESULT

OUTPUT:

1.

REC/PLAY

head

azimuth

OUTPUT

cont.:

convenient

MTT-316

(12.5

kHz)

output

level

position

3.

Specified

output

level

OUTPUT:

MTT-316

Fig.

5-9

R10/R20

Azimuth

nut

of

@

Phase:

about

0°

R-P

heads

on

‘scope

(Fig.

5-4)

(Fig.

5-3)

@

Max.

output

on

Phase:

45°

min.

(315

Hz}

90°

min.

4.

PEAK

LEVEL

meter

MTT-150

‘

EQ:

METAL,

Co(CrO,}

Adjust

for

10

kHz

to

be

the

OUTPUT:

At

10

kHz,

should

be

3

d8

to6dB

VTIVM

OUTPUT:

2.

Phase

shift

Same

as

above

MTT-316

Check

{12.5

kHz)

TP1/TP2

MTT-

R1

ies

viene

~2.5

dB

(581

mV)

*Spec.

setting

of

OUTPUT:

OUTPUT

cont.

~5

dB

(436

mV)

©

Spec.

output

level

same

level

as

ref.

signat

(315

Hz)

higher

than

measured

in

above

step,

5.

Frequency

response

EQ:

NORMAL

MTT-316

SPEED:

STANDARD

and

Fully-erased

tape:

OUTPUT:

HIGH

(Use

bulk

tape

eraser)

ys

52

dB

min.

{STD}

Ratio

of

spec.

6.

Signal-to-noise

ratio

|EQ:

METAL

.......~...

.

METAL

.....,

55

dB

min.

(HI}

output

of

Col(CrO.)

.........

.

.MTT-5061.....

}

48

dB

min.

~5

dB

to

noise

NORMAL

.........

.

MTT-50%

.....

a

53

dB

min.

PHONES:

—15.8

dB

+3

dB

(89.0

mV

to

178

mV}

7.-

Headphone

output

level

MTT-150

Check

AC

Voltmeter

0°

(IN

PHASE)

45°

90°

180°

DECK

under

TEST

PHONES

Fig.

5-4

Confirming

phase

relationship

Fig.

5-5

Test

setup

for

headphone

check

vA

|

REC-PAUSE

mode

MONITOR

sw.:

SOURCE

NR

SYSTEM

sw.:

OUT

INPUT

sw.:

LINE

5-2

MONITOR

PERFORMANCE

OUTPUT

cont.:

Specified

position

(item

3)

10

SETTING

INPUT

SIGNAL

MIC:

400

Hz/—67

dB

.

{346

pV)

RECORD

cont.:

Max

INPUT

sw.:

MIC

8.

Min.

input

level

INPUT

sw.:

LINE

IN:

400

Hz/—19

dB

{86.9

mv)

LINE

IN:

9,

LINE

specified

input

level

400

Hz/—93

dB

(275

mV)

LINE

IN:

400

Hz/-—S

dB

(275

mV)

ADJUST

(or

CHECK)

RECORD

cont.

{L./R)

Check

MEASURING

POINT:

RESULT

OUTPUT:

—5 dB

33

dB

{308

mV

to

615

mV)

MIC

min.

input

OUTPUT:

~—5

dB

+3

dB

;

(308

mV

to

615

mV}

input

level

:

Specified

sat-

OUTPUT:

ting

of

RE-

DOLBY

TP

(TP1/TP2}:

—2.5dB

+0.5dB

(548

mV

to

615

mV}

IMPORTANT:

Do

not

changes

the

setting

of

the

RECORD

or

OUTPUT

controls,

after

establishing

their

setting

as

above.

10.

PEAK

LEVEL

meter

11.

“TEST

IN”

INPUT

sw.:

TEST

LINE

IN:

400

Hz/--9

dB

{275

mV}

LINE

IN:

400

Hz/~—29

dB

(27.5

mV)

Deck

settings:

MONITOR

sw.:

TAPE

NR

SYSTEM

sw.:

OUT

INPUT

sw.:

LINE

SPEED

sw.:

STANDARD

ADJUST/PRE-SET

sw.:

PRE-SET

OUTPUT

cont.:

5-3

RECORDING

PERFORMANCE

RECORD

cont.

(L/R):

SETTING

12,

BIAS

trap

Record-pause

mode

BIAS,

EQ:

METAL

Tape:

METAL

13.

Record

bias

BIAS,

EQ:

Co(CrO,)

Tape:

MTT-5061

BiAc

CA.

NABMAL

Tape:

MTT-501

INPUT

SIGNAL

LINE

IN:

No

signal

LINE

IN:

400Hz

&

10

kHz

alternately

/—42

dB

(6.15

mV}

LINE

IN:

400

Hz

&

10

kHz

alternately

/~42

dB

(6.15

mV)

LINE

IN:

AGO

hie

&

40

bhit=

alternately/~42

dB

(6.15

mV}

Specified

position

(item

3)

Specified

position

{item

9)

ADJUST

(or

CHECK)

L104/L204

R15/R25

R14/R24

RI3/R2Z3

PEAK

LEVEL

meter:

0

dB

+1

dB

PEAK

LEVEL

meter:

0

dB

+2

dB

TEAC

test

tapes:

MTT-5061:

For

record

test

with

Co(Cr0

5)

MTT-501:

For

record

test

with

NORMAL

METAL:

For

record

test

with

METAL

MEASURING

POINT:

RESULT

BIAS

TRAP

TP

(TP3/TP4):

Min.

reading

OUTPUT:

Nearly

equal

level

at

both

frequencies

OUTPUT:

Nearly

equal

level

at

both

frequencies

OUTPUT:

Nearly

equal

level

at

both

frequencies

MEASURING

POINT:

ADJUST

ITEM

SETTING

INPUT

SIGNAL

(or

CHECK)

RESULT

LINE

(N:

400

Hz/--12

dB

{195

mv)

OUTPUT:

~8

dB

(308

mv}

BIAS,

EQ:

METAL

Tape:

METAL

R16/R26

BIAS,

EQ:

Co(Cr05)

eae

OUTPUT:

Tape:

MTT-5061

Geen

pe

—8

dB

(308

mv}

14,

Record

level

BIAS,

EQ:

NORMAL

LINE

IN:

OUTPUT:

Tape:

MTT-501

Pera

2d8

—8

dB

(308

mv)

SPEED:

STANDARD

and

|

HIGH

LINE

IN

OUTPUT:

:

Required

signal

/

: ;

Tape:

METAL

‘

LINE

IN:

IAS,

EQ:

‘

:

Frequency

sete

rico

|

Required

signal

/

ae

R18/R28

—42

dB

(6.15

mV}

response

LINE

IN:

Required

signal

/

—42

dB

(6.15

mV}

BIAS,

EQ:

NORMAL

Tape:

MTT-501

OUTPUT:

Fig.

5-11

{f

frequency

response

is

out

of

specification,

recheck

#13.

“Record

bias”.

LINE

tN:

400

Hz/—12

dB

{195

mV)

OUTPUT:

2%

or

less

distortion

16.

Total

harmonic

distortion

Same

as

above,

but

with

STANDARD

tape

only

LINE

iN:

SPEED:

STANDARD

and

”

ae

4

49

dB

min.

(HI)

Tape:

METAL

:

no

signal

LINE

IN:

17.

Signal-to-noise

1

kHz/—9

dB

OUTPUT:

Ratio

of

-

.

BIAS,

EQ:

Co(Cro;)}

;

Ratio

of

spec

ratio

Tape:

roe

sf

2

{275

mV)

48

dB

min,

(STD)

ified

output

of

‘

49

dB

min.

(HI)

No

signal

LINE

IN;

+5

dB

to

noise

1

kHz/—9

dB

OUTPUT:

BIAS,

EQ:

NORMAL

Tape:

a

ees

ss

(275

mv)

45

dB

min.

(STD)

t

46

dB

min.

{H})

no

signal

*

Connection

is

same

as

in

Fig.

5-1,

but

engage

1-kHz

filter.

®

Record

a

1-kHz

signal.

Rewind

tape

to

midpoint

of

recorded

portion.

Record

a

‘‘no

signal

portion.

Find

the

difference

between

the

1-kHz

portion

and

the

“‘no-signal"’

portion.

18.

Erase

efficiency

LINE

IN:

BIAS,

EQ:

METAL

oan

OUTPUT:

Ref.

output

Tape:

METAL

;

: :

evel:

p

ih

65

dB

min.

ratio

+5

dB

(1.38V)

no

signal

@

Connection:

Fig.

5-1,

but

engage

1-kHz

fiiter,

@

Record

a

1-kHz

signal.

Push

REC

MUTE

button

for

several

seconds.

Rewind

and

play

the

tape.

Find

the

difference

between

the

1-kHz

portion

and

the

“no-signal’’

portion.

19.

REC

MUTE

function

LINE

IN:

BIAS,

EQ:

Co(CrO3)

oc

OUTPUT:

Ref.

output

Tape:

MTT-S06!

il

65

dB

min.

ratio

+5

dB

(1.38

V)

no

signal

@

Connection:

Fig.

5-1,

but

do

not

connect

LINE

filter.

®

Set

the

deck

to

record

mode.

Find

the

difference

between

the

1-kHz

recorded

portion

(L-ch}

and

the

‘‘no

signal"

Portion

(R-ch).

IN

(R),

and

engage

1-kHz

20.

Channel

separation

LINE

IN:

Lh

1

kHz/-9

dB

(275

mV).

R-ch

No

signal

BIAS;

EQ:

Co(CrO3)

Tape:

MTT-5061

OUTPUT:

35

dB

min.

ratio

11

ITEM

SETTING

INPUT

SIGNAL

of

previously

recorded

portion.

21.

Adjacent

track

crosstalk

LINE

tN:

BIAS,

EQ:

Co(CrO>}

L-ch

No

signal

Tape:

MTT-5061

R-ch

125

Hz/-9

dB

(275

mV)

using

a

10-kHz

signal.

LINE

IN:

1

kHz/—29

dB

(27.5

mV)

22.

DOLBY

NR

effect

BIAS,

EQ:

Co(CrO3)

Tape:

MTT-5061

BIAS,

EQ:

Co(CrOz)

Tape:

MTT-5061

LINE

IN:

10

kHz/—39

dB

(8.69

mV}

BIAS,

EQ:

NORMAL

LINE

IN:

Tape:

MTT-501

Required

signal/

NR

SYSTEM:

—42

dB

(6.15

mV)

LINE

IN:

Required

signal

/

—42

dB

(6.15

mV}

LINE

IN:

23.

Dolby

HX

Required

signal

/

effect

—12

dB

(195

mV)

LINE

IN:

NR

SYSTEM:

Required

signal

/

—12

dB

(195

mV}

BIAS,

EQ:

Co(CrO,)

Tape:

MTT-5061

BIAS,

EQ:

Co(CrO>}

Tape:

MTT-5061

INPUT:

TEST

ADJUST/PRE-SET

sw.:

ADJUST

LINE

iN:

1

kHz/—29

dB

(27.5

mv)

Record-pause

mode

MONITOR

sw.:

SOURCE

Record-pause

mode

MONITOR

sw.:

SOURCE

1

kHz/—29

dB

(27.5

mv)

LINE

IN:

1

kHz/--29

dB

(27.5

mV)

Record-play

mode

24,

BIAS/REC

MONITOR

sw.:

TAPE

CALIBRATION

(on

front

panei)

LINE

IN:

1

kHz/—29

dB

(27.5

mv)

Record-play

mode

MONITOR

sw.:

TAPE

LINE

IN:

400

H2/-—29

dB

{27.5

mV)

Record-play

mode

MONITOR

sw.:

TAPE

SOURCE

LINE

IN:

400

Hz/—29

dB

6.3

kHz/—29

dB

Te.

Ke

f—c2

as

Record-play

mode

MONITOR

sw,:

TAPE

12

e

Connection:

Fig.

5-1,

but

do

not

connect

LINE

IN

(L})

and

OUTPUT

(L).

@

Record

a

125-Hz

signal

on

R-ch

and

note

output

level.

Invert

tape

and

play

R-ch

track,

Check

teakage

level

against

the

output

reference

e

Record

a

1-kHz

signal

with

NR

SYSTEM

switch

OUT.

Play

this

portion

with

NR

SYSTEM

switch

set

to

OUT

and

set

to

NR.

Obtain

the

difference

in

output

level

between

OUT

and

NR

positions,

Repeat

the

above

process

R35/R45

trim-pot:

fully

CCW(

)

R30/R40

trim-pot:

fully

CW(O}

me

eee

i

ia

a

eee

MEASURING

5-4

ADJUSTMENT

AND

TEST

POINT

LOCATIONS

POINT:

ADJUST

(or

CHECK)

RESULT

LAs

GaAK

SS

(GAS

(aR

14

Rr

ltahaal

OUTPUT:

40

dB

min.

ratio

a

amin

gate

west

OUTPUT:

Variation

3dBto8dB

ne.

ae

OEE

NE

mI

RES

Gael

dca

He

tmmeney

etc

aye

OUTPUT:

=

Variation

‘eye

oegt

|

8

dB

to

12

dB

J

~

fy

ae

j

TECGND

ae

OUTPUT:

‘a

one’

Fig.

5-12

.

\y,

et

es

Fd

Oe

ty

3

FR

ty

get

a

ED

ae

es

ee

be

Ss

R36

{for

L-and

|

OUTPUT:

“

R-channets)

Fig.

5-12

.

OUTPUT:

Check

Fig.

5-13

OUTPUT:

Check

At 10

kHz

to

12.5

kHz,

should

be

tower

than

measured

in

step

(3).

a

Repeat

steps

(1)

to

(4),

but

substitute

R37

for

R36.

R10/R20

R11/R21

-

R12/R22

RECORD

cont’s

|

OUTPUT:

R13/R23

(L/R)

—25

dB

(43.6

mV)

8

sda

ee

he

ee

R14/R24

een

PEAK

LEVEL

meter:

R15/R25

0dB

+2

dB

While

rotating

R35/R45

trim-pots

clock-

wise,

check

that

the

difference

in

OUTPUT

level

between

the

setting

where

a

maximum

output

value

is

obtained

and

when

the

trim-pot

is

set

fully

clockwise

is

more

than

4

dB.

R16/R26

R17/R27

Rt8/R28

R30/R40

R35/R45

variable

range

checks

R35/R45

Set

R35/R45

in

the

position

correspond-

ing

to

maximum

output

value.

Check

that,|

R30/R40

|

when

R30/R40

is

rotated

from

fully

CW

variable

range

position

to

fully

CCW

position,

OUTPUT

level

is

reduced

by

more

than

10

dB.

OUTPUT:

Equal

level

with

MONITOR

switch,

TAPE

and

SOURCE

R36

R37

1104/L204

R30/R40

OUTPUT:

Flat

jevel

between

all

4

signals

R35/R45

‘

R35 R45 R30

R40

Fig.

58

Playback

EQ

Playback

level

PEAK

LEVEL

meter

Record

bias

(NORMAL)

Record

bias

[Co(CrO,)}

Record

bias

(METAL)

Record

level

(METAL)

Record

level

[Co(Cr0,)}

Record

level

(NORMAL)

Record

level

(coarse-adjusted

for

general

setting)

Record

bias

(coarse-adjusted

for

general

setting)

DOLBY

HX

effect

(NORMAL)

DOLBY

HX

effect

[Co(Cr0,)]

Bias

trap

13

C-3K

6

EXPLODED

VIEWS

AND

PARTS

LIST

|

"JA

Parts

marked

with

*require

longer

delivery

time

than

regualr

parts.

=

JeranenaicWa

EXPLODED

VIEW

-

1

INCLUDED

ACCESSORIES

REF.NO.

PARTSNO.

DESCRIPTION

REF.NO.

PARTSNO.

OESCRIPTION

1-1

*6800060300

Cover,

Top

[All

except

L]

5128065000

Cord

Assy,

eect

Weuher

eas

1-2

“5122168000

Connector,

Socket;

6P

Input-output

Connection

M4x6

(BLK

Ni)

1

3

*5122165000

Connector,

Socket;

3P

5101345000

=

Information

Supplement,

Cassette

ets

Boe

1-4

*5122166000

Connector,

Socket;

4P

{U]

eet

we

1

-

5

5122172000

Connector,

Socket;

10P

5101495000

information

Supplement,

Cassette

|

4x

615x10.5(BLK)

[All

except

U]

1

6

“5122167000

Connector,

Socket;

5P

1-7

*5800059400

Bracket,

Handle;

L

{All

except

L]

5740005000

Plate

Assy,

Side;

B

[Ail

except

L]

1

-

8

*5800083400

Escutcheon

Assy,

Cassette

5544995000

Washer

x

4

[All

except

L]

1-9

*5122174000

Connector,

Socekt;

12P

5534659000

Sapcer

x

4

[All

except

tL]

1

-10

*5785603025

Spacer

5780215015

Screw,M5x

15

(Ni)

x4

.)

[All

except

L]

ee

Se

esiOs

1-41

5504712000

Knob

Assy,

TIMER

5564682000

Seal,

MEMORY

[Ali

except

L]

1

-12

*5640007300

Panel

Assy,

Front

1

-13

5543027100

Knob,

VR

5700007200

C-3X

Owner’s

Manual

[U]

+

-14

5534521000

Knob,

Lever

Switch

5700007300

C-3X

Owner's

Manual

1

-15

*5552340201

Chassis,

Rear

[All

except

“]

[Ail

except

U]

*§502229001

Chassis

Assy,

Rear

[1]

7

1

-16

“5504676000

=

Foot

[All

except

L]

>

1

-17

“5800059500

=

Bracket,

Handle;

R

[All

except

L]

1

-18

*5800064800

Cabinet

Assy

[L]

1-19

*5555526000

Washer

[L]

1

-20

*5800060400

Cover,

Top;

Shieid

[L]

we

1-21

*5800059800

_

Sash,

Side;

L

[L]

~,

1

-22

*5800059900

=

Sash,

Side;

R

[L]

2-Fiber

Washer

(BLK)

1

-23

5138009000

Key

Unit

@)

4x

BISxt0.5

1

-24

5503187000

Cover

Assy,

Cassette

"8B

2-round

Washer

Head

M4x6

(BLK

Ni)

|

2)

3-8

M4x6(Ni)

M3x6

(Ni)

|

Nev

a

16

)

RTS

er”

M4x20

v

{U]

Uj]:

ULS.A.

(C]:

CANADA

[GE]:

GENERAL

EXPORT

[A]:

AUSTRALIA

[E]:

EUROPE

[UK]:

ULK,

{LJ}:

LIMITED

AREA

17

16

70

EE.

Abe

EXPLODED

VIEW

-2

os,

i

ee

PSA

M265

eee

“M26

x4

Me.

{BLK

Ni)

M2.6x4

(BLK

Ni}

M2.6

44

(BLK

Ni)

PSA

lie

|

“\25a

M26x5

720)

PSA

M2.6x5

18

EXPLODED

VIEW

-2

REF.

NO.

2

P

2

P

2

toe

8 8

4

1

—_—

fae

io

Te

oR

Bop)

orf

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=

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1

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enh

oh

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db

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NN

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NO

NON

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WR

Wh NN

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COs

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‘

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PARTS

NO.

*5553285000

*5544958000

*5534612000

*5534613000

*5555655000

“5534615000

*5555582000

*5534638000

*5534844000

*5520333000

*5504669002

*5210010200

*5210022400

5142026000

*5544656000

*5555544000

*5524

197000

*5555535000

5504660001

5534617000

*5534448000

*5200018410

*5200018400

*5534444200

*552420

1000

*6555551000

*5800090600

*5800098500

*5555552000

5800063800

*$581055000

5800063700

*§555549000

*5524

200000

*5534606000

5504828001

*5800060100

*5524285000

*555553

1000

*5555530000

*550471

7000

*5581062000

5540055000

*5555533000

*5800064400

5569613000

5524141000

*5524208000

*§533

174000

5540056000

5800063300

5800063200

5534683100

*5504716000

*5555658000

5569606

100

5534614000

*§504714000

*5504715000

*5524202000

ae

Parts

marked

with

“require

longer

delivery

time

than

reguair

parts.

DESCRIPTION

Holder,

Cassette

Shaft,

Lock

Plate

Plate,

Lock

|

Guide,

Cassette;

L

Piate,

Cassette

Hoider

Spring,

Cassette

Pressure

Tape,

Adhesive

Lens,

Lamp

Shoe,

Brake

Spring,

Brake

Plate

Assy,

Brake;

B

PCB,

LAMP

[VU]

PCB,

LAMP

[All

except

U}

Lamp,

DC

6V

65mA

Shaft,

Lever

Lever,

Record

Preventing;

OD

Spring,

Lever

Bracket,

Counter

Assy

Counter

Assy

Belt,

Counter

Mounting

Rubber

PCB

Assy,

REED

SW

[Ail

except

U]

PCB

Assy,

REED

SW

[U]

Guide,

Cassette

-

Spring,

Eject

Arm

Arm,

Eject

Holder

Assy,

Switch

Cushion,

Reel

Arm,

Eject

Actuating

Pulley

Assy,

Reel;

R

Screw,

Shoulder

Pulley

Assy,

Reei;

L

Arm,

Eject

Preventing

Spring,

Arm

Arm,

Pinch

Roller

Arm

Assy,

Pinch

Roller

Chassis

Assy,

Mechanism

Spring,

Pinch

Roller

Plate,

Head

Base;

B

Plate,

Head

Base;

A

Plate

Assy,

Head

Base

Clamper,

Cord;

E

Steel

Ball,

$2

Plate,

Pressure

Spacer,

Erase

Head

Head,

Erase

Spring,

Height

Adj.

Spring,

Tension

Arm,

Tension

Steel

Ball,

63

Table

Assy,

Reel;

R

Table

Assy,

Reel;

L

Guide,

Cassette;

L

Plate

Assy,

Head

Mounting

Plate,

Tension

Adj.

Head,

REC-PLAY

Guide,

Cassette;

R

Bracket

Assy,

Holder;

L

Bracket

Assy,

Holder;

R

Spring,

Holder

[(U]:

U.S.A,

{C]:

CANADA

[GE]:

GENERAL

EXPORT

[A]:

AUSTRALIA

{[L]:

LIMITED

AREA

{E]:

EUROPE

[UK]:

U.K.

|

GSK

|

19

3X

Parts

marked

with

*require

longer

delivery

time

than

regualr

parts.

EXPLODED

VIEW

-

3

REF.NO.

PARTSNO.

DESCRIPTION

*5504673000

Holder

Assy,

Damper;

C

*5555555000_

=

Bracket,

Damper

5370000600

Motor

Assy,

Capstan;

OC

*5800064600

Plate,

Flywheel

Base

“5534277000

~=Bearing,

Flywheel

EXPLODED

VIEW

-

3

*5200014100

PCB

Assy,

JOINT

[U]

*5200014110

PCB

Assy,

JOINT

[All

except

U]

5504757000

Flywheel

Assy,

Capstan

5163040000

Solenoid,

B

5163039100

Solenoid,

A

©OMO

~)

o

OhWA

=

-10

5313000500

Solenoid

-11

*5555546000

Arm,

Pressure;

B

-12

*5581038000

Ciamper,

Cord;.A

-13

*5800062600

Lever,

Actuating

-14

“5524195000

Spring,

Lever

-

*5504666000

_

=—s

Lever

Assy,

Pause

Actuating

-

16

*5534611000

Arm,

Pause

Actuating

-17

*5800061900

Arm

Assy,

Actuating

-

18

*5504665000

Lever

Assy,

Actuating

-

19

*5524213000

Spring,

Actuating;

A

-

20

*5800065500_—séw

Brackett

Assy,

Solenoid;

B

-21

*5555543000

_~—s

Bracket,

Switch

-22

5130003000

Switch,

Micro

-

23

*6534610000

Arm,

Base

Actuating

-

24

*5800062700

=

Spring,

Pulley

Guide

-

25

*5800062900

Plate,

Pulley

Guide

-

26

*5504667000

~=—

Lever

Assy,

Pause

-27

*5524203000

Spring,

Damper

-

28

*5788202100

String,

Damper

-

29

*§5555556000

=

Angie, Spring

Ww

to

Ww

WWWWH

WW

Www

Ww

OO

WW

OO

WW

QS

WWWWW

—

an

-

30

*5800060100

Chassis

Assy,

Mechanism

-31

*6800062300

Sracket,

Switch

-32

*5800062800

Spring,

Cassette Pressure

-

33

*5800061600

Arm,

Cassette Pressure

-

34

*5504670000

=

Lever

Assy,

Eject

-35

*5524199000

Spring,

Eject

-

36

*5800063000

Guide,

Actuating

Bar

-37

*5800062500

_—s

Bar,

Brake

Actuating

-

*5534130000

Washer,

Oil

Retaining

-

39

*5504091000

Housing

Assy,

Capstan

-40

*5550031000

Washer

Thrust

-

44

5504808000

Pulley

Assy,

Fast

Wind

-

42

*5524274000

=

Spring,

Arm

-

43

5800063100

Belt,

Capstan

Drive

-

44

5800062400

=

Pulley,

Motor

-45

*5504807001

=~

Plate

Assy,

Motor

-

46

7105135000

Motor

Assy,

Reel;

DC

-

47

*5534537000

Collar,

Rubber

Www

Ww

GO

&

WO

OW

WWW

WW

&

co

ad

[U]:

U.S.A.

[C]:

CANADA

{GE}:

GENERAL

EXPORT

[A]:

AUSTRALIA

[E]}:

EUROPE

[UK]:

U.K.

[L]:

LIMITED

AREA

Teac C-3X Manuale utente

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