Teac C-3RX Bedienungsanleitung

TEAC.

SERVICE

MANUAL

—C-3RX

Stereo

Cassette

Deck

Effective:

June,

1981

B10049

5704010000

G3RX

SPECIFICATIONS

AND

SERVICE

DATA

NOTES:

Improvements

may

result

changes

specifications

and

service

data.

referenced

0.775

this

manual.

SPECIFICATIONS

Track

System

4-track,

2-channel

stereo

Heads

Erase,

record

and

playback

Type

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

(1.09

mV)/10k

ohms

Minimum

input

level:

—67

(346

uV)

LINE

IN:

Specified

input

levei:

—9

(275

mV)/50k

ohms

Minimum

input

level:

—19

(86.9

mV)

Output

(level

and

impedance)

OUTPUT:

Maximum

output

level:

—2.5

(581

mV)/50k

ohms

Specified

output

level:

—5

(436

mV)

PHONES:

Specified

output

level:

—15.8

(126

mV)/8

ohms

Equalization

METAL:

3180

us+

(Cr0,):

3180

NORMAL:

3180

120

Head

Configuration

1/2-track,

1-channel

erase

head

1/4-track,

2-channel

record

head

and

playback

head

single

housing

Motors

servo

capstan

motor

reel

motor

Bias

Frequency

100

kHz

Operation

Position

Horizontal

Power

Requirements

100/120/220/240

AC,

50/60

Hz,

(General

export)

120

AC,

Hz,

(U.S.A./Canada)

220

AC,

Hz,

(EUR)

240

AC,

Hz,

(U.K./Australia)

Weight

9.5

(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

Dolby

Laboratories

Licensing

Corporation.

dbx

Noise

Reduction

System

made

under

license

from

dbx,

Incorporated.

The

name

dbx

and

the

dbx

symbol

are

trade-

marks

dbx,

Incorporated.

SERVICE

DATA

MECHANICAL

Tape

Speed

Deviation

3,000

+45

Tape

Speed

Drift

Wow

and

Flutter

Playback:

0.08%

(WRMS)

Record/playback:

0.25%

(RMS)

Pinch

Roller

Pressure

390

490

(13.8

17.3

02.)

Reel

Torque

Takep-up:

g-cm

(0.62

0.90

oz-inch)

Supply:

g-cm

(0.042

0.11

02-inch)

F.F.&

REW:

160

g-cm

(1.25

2.22

oz-inch)

Fast

Winding

Time

seconds

for

MTT-501

(C-60)

ELECTRICAL

Frequency

Response

See

Figs.

5-5,

5-7

and

5-8

Signal-to-noise

Ratio

Playback:

METAL,

(CrO,):

min.

NORMAL:

min.

Overall:

METAL,

(CrO,):

min.

NORMAL:

45 dB

min.

S/N

improved

kHz

and

above

kHz

when

Dolby*

used.

Erase

Efficiency

min.

kHz

(measured

with

input

higher

than

the

specified

input

level)

Channel

Separation

min.

(NR

QUT),

min.

(NR

dbx**)

kHz.

Adjacent

Track

Crosstalk

min.

125

Total

Harmonic

Distortion

2.0%

less

(NR

OUT),

1.5%

less

(NR

dbx)

with

NORMAL,

(Cr0.)

and

METAL

tapes

CAUTION

Parts

marked

with

this

sign

are

safety

critical

components.

They

must

always

replaced

with

identical

components

refer

the

TEAC

Parts

List

and

ensure

exact

replacement.

PARTS

LOCATION

POWER

TRANSFORMER

REMOTE

PCB

ASSY

DBX

PCB

ASSY

POWER

SUPPL

PCB

ASSY

JOINT

PCB

ASSY

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

HOLDER

TENSION

ARM

REC/PLAY

HEAD

BASE

SOLENOID

Fig.

2-2

Fig.

2-3

]

C-3RX

REMOVAL

EXTERNAL

COMPONENTS

Disassemble

number-order

LIMITED

AREA

Broken

line

indicates

the

dimensions

some

general

export

models.

Fig.

3-2

Dimensions

Fig.

3-1

C-3RX

MECHANICAL

ADJUSTMENTS

AND

CHECKS

4-1

REEL

TORQUE

Load

the

cassette

torque

meter

the

deck

and

read

the

pointer

indication

the

dial

scale

for

each

tape

transport

operation.

The

measured

torque

should

within

the

following

values:

Take-up:

g-cm

(0.62

0.90

oz-inch)

Supply:

g-cm

(0.042

0.11

oz-inch)

F.F.and

REW:

160

g-cm

(1.25

2.22

0z-inch)

4-2

PINCH

ROLLER

PRESSURE

With

the

cassette

holder

shut

and

tape

loaded,

put

the

deck

PLAY

mode.

Hook

spring

scale

the

tap

the

pinch

roller

assembly

plate,

shown

the

illustration.

Pull

the

scale

down

until

there

sufficient

force

separate

the

pinch

roller

from

the

capstan

shaft.

Ease’

pressure

until

the

pinch

roller

makes

just

enough

contact

with

the

capstan

shaft

that

the

pinch

roller

just

begins

turn.

this

point,

note

the

reading

the

scale.

should

from

390

490

(13.8

oz.

17.3

02.)

the

pressure

not

within

the

prescribed

specifications,

may

adjusted

first

removing

the

pinch

roller

spring

from

the

pinch

roller

assembly

and

then

bending

the

spring

shown

the

illustration.

stronger

weaker

Fig.

4-1

4-3

HEAD

BASE

PLATE

POSITIONING

Set

the

deck

the

PLAY

mode.

, ;

Push

the

head

base

plate

hand

the

direction

the

arrow

and

check

that

the

head

base

plate

and

the

stopper

portion

the

mechanism

chassis

make

contact.

there

any

clearance,

loosen

the

two

screws

the

head

base

plate

solenoid

and

reposition

the

solenoid

until

the

clearance

eliminated.

Head

base

plate

Stopper

portion

mechanical

chassis

There

should

clearance

this

point.

Push

hand

T-1554-1

when

PLAY

mode

Fig.

4-2

Screws

Head

Base

Solenoid

Fig.

4-3

Head

base

solenoid

location

4-4

CAPSTAN

ASSEMBLY

THRUST

Turn

the

thrust

adjusting

screw

that

thrust

the

capstan

shaft

within

0.05

0.15

mm.

Thrust

play

0.05

0.15

ily

—)|__ez

Thrust

adjusting

screw

Flywheel

C-3RX

4-5

TAPE

SPEED

Connect

frequency

counter

the

deck

shown

Fig.

4-5.

Play

tape

for

about

five

minutes

warm

the

deck,

then

load

TEAC

MTT-111

test

tape

containing

3000-Hz

test

tone

and

play

the

test

tape

from

the

beginning.

While

the

tape

playing,

use

common

slotted

screwdriver

with

the

handle

completely

insulated

from

the

blade,

and

adjust

the

control

the

capstan

motor

(as

far

possible)

for

reading

3000

(£5

Hz)

the

frequency

counter.

Play

the

tape

the

beginning

and

the

end,

and

check

that

the

speed

deviation

within

the

prescribed

limits

observing

that

the

reading

the

frequency

counter

never

deviates

than

+45

from

3000

Hz,

nor

drifts

than

any

given

time.

the

tape

speed

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

clean.

Frequency

Counter

Oscillator

Wow

Flutter

Meter

DECK

[_—_—_junder

TEST

(

LINE

)

OUTPUT

Fig.

4-5

Tape

speed

control

Fig.

4-6

Tape

speed

adjustment

location

4-6

WOW

AND

FLUTTER

Note:

These

measurements

should

made

the

beginning,

middle,

and

the

end

the

tape.

PLAYBACK

Connect

wow-and-flutter

meter

the

deck

shown

Fig.

4-5.

Load

and

play

TEAC

MTT-111

test

tape.

Check

that

the

reading

the

wow-and-flutter

meter

within

0.08%

(WRMS).

SIMULTANEOUS

RECORD/PLAYBACK

METHOD

STANDARD

Speed

Load

TEAC

MTT-501

test

tape

(blank)

and

record

3000-Hz

signal.

With

the

MONITOR

switch

the

TAPE

position,

note

the

read-

ing

the

wow-and-flutter

meter,

should

not

than

0.25%

(RMS).

NON-SIMULTANEOUS

RECORD/PLAYBACK

METHOD

Rewind

the

tape

the

beginning

the

recorded

section

pre-

viously

made

step

and

play

it.

The

wow

and

flutter

should

not

than

0.25%

(RMS).

4-7

MICROSWITCH

(A)

ASSEMBLY

CLEARANCE

Insert

blank

cassette

and

the

cassette

holder.

Loosen

the

two

screws

the

microswitch

(A).

Move

the

switch

that

actuator

the

switch

contacts

the

safe-

lever.

Adjust

the

switch

position

obtain

clearance

between

0.1

0.3

mm.

Retighten

the

screws,

Safety

lever

Blank

cassette

(

T-1556

0.1

0.3

clearance

Actuator

Safety

lever

Bent

tip

switch

bracket

Fig.

4-7

4-8

MICROSWITCH

(B)

ASSEMBLY

CLEARANCE

Push

the

EJECT

button

open

the

cassette

holder.

Loosen

the

two

screws

the

microswitch

(B).

Move

the

switch

that

switch

actuator

contacts

the

bent

pro-

jecting

portion

the

eject

lever.

Adjust

the

switch

position

obtain

clearance

approximate-

mm.

Retighten

the

screws.

—

Actuator

earance

rox.

7mm

Fig.

4-8

C-3RX

4-9

LUBRICATION

Lubrication

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,

equivalent

Grease:

ORE-LUBE

G1/3

equivalent

Apply

drop

oil

with

oil

applicator

point

about

1/3

the

way

down

the

shaft

(from

the

free

end)

the

flywheel,

then

insert

the

shaft

into

the

capstan

housing.

Apply

suitable

amount

light

grease

the

well

the

fly-

wheel

bearing.

Capstan

Flywheel

Ass’y

Well

Flywheel

Bearing

Capstan

Shaft

Capstan

Housing

Fig.

4-9

4-10

VOLTAGE

SELECTION

(FOR

GENERAL

EXPORT

MODELS)

Always

disconnect

the

power

line

cord

before

making

these

adjustments.

Remove

the

top

cover

the

deck

removing

the

screws

from

the

sides.

Locate

the

voltage

selector,

shown

the

illustration,

the

front

the

power

transformer.

Loosen

the

two

screws

the

jumper

bar

and

move

the

bar

that

jumpers

the

opposing

terminals

marked

with

the

required

voltage

(100,-120,

220

240).

Retighten

the

screws

and

replace

the

top

cover.

4-11

POWER

LINE

FREQUENCY

Since

the

C-3RX

uses

servo

motor,

operation

permitted

without

any

change

power

line

frequency.

Jumper

bar

Fig.

4-10

C-3RX

ELECTRICAL

ADJUSTMENTS

AND

CHECKS

PRECAUTIONS

Before

beginning

any

checks

adjustments,

clean

and

demag-

netize

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

designations

indi-

cate

L-ch/R-ch.

(Example:

R11/R21)

For

this

deck,

referenced

0.775

you

are

using

voltmeter

which

references

appropriate

com-

pensation

should

made.

The

voltmeter

used

the

procedures

must

have

input

impedance

ohms

more.

Note

the

“Deck

settings”

the

top

each

chart.

These

settings

must

used

for

all

the

checks

each

chart

unless

explicitly

stated

otherwise.

OSCILLATOR

pistORTION

ANALYZER

ATTENUATOR

LINE

—70

more...

What

does

mean?

reference

some

specifications,

you

may

come

across

expres-

sion

like:

“—70

more”.

This

means

that

the

lower

the

value

this

specification,

the

greater

the

absolute

value

the

specifica-

tion

and

the

better

the

performance

the

deck.

For

instance,

noise

floor

—76

better

than

—70

dB,

because

this

means

that

the

level

noise

lower.

this

case,

“—70

more”

means

least

good

value

—70

and

maybe

even

better,

i.e.,

-71

dB.

OSCILLOSCOPE

Voltmeter

OUTPUT

Fig.

5-1

Basic

test

setup

OSCILLOSCOPE

AMP

SPKR

DECK

under

TEST

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

SYSTEM

sw.:

OUT

MTT-316:

For

playback

frequency

response

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°

‘scope

(Fig.

5-4)

Max.

output

VTVM

OUTPUT:

Phase:

45°

min.

(315

Hz)

90°

min.

(12.5

kHz)

Conn.:

Fig.

5-2

Azimuth

nut

R-P

heads

{Fig.

5-3)

REC/PLAY

head

azimuth

OUTPUT

cont.:

convenient

output

level

position

pan

neon

“

MTT-150

MTT-316

(12.5

kHz)

;

TP1/TP2:

—2.5

(581

mV)

®@

Spec.

setting

OUTPUT

cont.

Spec.

output

level

OUTPUT:

—5

(436

mV)

Specified

output

level

EQ:

METAL,

Co(CrO,)

Adjust

for

kHz

signal

same

level

ref.

signal

(315

Hz)

Frequency

response

---

---~-~-4------------}-~-----—--|--

---------

OUTPUT:

kHz,

should

6dB

higher

than

measured

above

step.

OUTPUT:

R10/R20

Fig

EQ:

NORMAL

MTT-316

Fully-erased

tape:

OUTPUT:

{Use

bulk

tape

eraser)

}

Ratio

spec.

Signal-to-noise

ratio

}EQ:

METAL

.....

etree

METAL

......

min.

output

Co{CrO.)

2.2.2...

MTT-5061.....

—5

noise

NORMAL

.........

MTT-501

.....

..48dB

min.

EQ:

NORMAL

Tape:

MTT-216

EQ:

METAL,

Co{CrO2)

(

Tape:

MTT-316

0°

(IN

PHASE)

45°

90°

180°

RESPONSE

FREQUENCY

Fig.

5-4

Confirming

phase

relationship

Fig.

5-5

Playback

frequency

response

C-3RX

Deck

settings:

SYSTEM

sw.:

OUT

REC-PAUSE

.node

INPUT

sw.:

LINE

5-2

MONITOR

PERFORMANCE

MONITOR

sw.:

SOURCE

OUTPUT

cont.:

Specified

position

(item

MEASURING

POINT:

ADJUST

(or

CHECK)

ITEM

SETTING

INPUT

SIGNAL

RESULT

MIC:

OUTPUT:

400

Hz/—67

dB —5

(346

nV)

(308

615

mV)

LINE

IN:

ouTpuT;

|...

sw.

“400

Hz/—19

—5

(86.9

mV)

(308

615

mV)

RECORD

cont.:

Max.

Min.

input

level

input

level

LINE

IN:

Specified

set-

400

Hz/—9

Rae

psec

ting

RE-

(275

mV)

CORD

cont.

ants

specified

input

LINE

IN:

DOLBY

(TP1/TP2):

400

Hz/—9

Check

—2,.5dB

+0.5dB

(275

mV)

(548

615

mV)

IMPORTANT:

not

change

the

setting

the

RECORD

OUTPUT

controls,

after

establishing

their

setting

above.

LINE

IN:

400

Hz/—9

Check

eee

(275

mV)

LINE

IN:

10,

“TEST

IN”

INPUT

sw.:

TEST

400

Hz/—29

Check

rege

meter:

(27.5

mV)

LINE

IN:

PHONES:

11.

PHONES

output

Connection:

Fig.

5-6

400

Hz/—9

Check

—15.8

level

(275

mV)

(89.0

178

mV)

PEAK

LEVEL

meter

Voltmeter

Deck

settings:

MONITOR

sw.:

TAPE

SYSTEM

sw.:

OUT

INPUT

sw.:

LINE

ADJUST/PRE-SET

sw.:

PRE-SET

DECK

under

TEST

OUTPUT

cont.:

Specified

position

(item

SROnES

RECORD

cont.

(L/R):

Specified

position

(item

Zao

TEAC

test

tapes:

Fig.

5-6

Deane

pious

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

LINE

IN:

12.

BIAS

tra

Record-pause

mode

L104/L204

(TP3/TP4):

signal

Min.

reading

LINE

IN:

OUTPUT:

BIAS,

EQ:

METAL

400Hz

kHz

R15/R25

Nearly

equal

tevel

Tape:

MTT-5072

both

frequencies

LINE

IN:

OUTPUT:

13,

Record:bias

BIAS,

EQ:

Co(CrO2)

400

kHz

R14/R24

Nearl

’

equal

level

Tape:

MTT-5061

wie

both

frequencies

LINE

IN:

BIAS,

EQ:

NORMAL

400

kHz

heey

aie

Tape:

MTT-501

ica

both

frequencies

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