Technics RS-630USD Manuel utilisateur

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ORDER

NO.

ARD-7607065C

Service

Manual

Cassette

Tape

Deck

RS-630USD

Front

Loading

High

Fidelity

Cassette

Deck

with

Large

Peak

Check

Meters

RS-630U

MECHANISM

SERIES

Specifications

(Catalog

specifications

for

sales)

Power

requirements:

AC;

220V,

50Hz

Fast

forward

and

Power

consumption;

10

W

rewind

time:

Motor:

1-electronic

speed

control

motor

Input:

Track

system:

4-track,

2-channe!

recording

and

playback

Tape

speed:

48cm/s

Wow

and

flutter:

0.09

(WRMS),

+0.20%

(DIN)

Output:

Frequency

response:

CrO2

tape;

20~16,000Hz

30

~

14,000

Hz

(DIN)

Normal

tape;

20

~

14,000

Hz

30~13,000Hz

(DIN)

.

Dolby

NR

in;

60

dB

(above

5kHz)

Signal-to-noise

ratio:

Dolby

NR

out;

50dB

(signal

level

=250nWb/m)

REC/PB

connection:

Head:

Dimensions:

Weight:

Approx.

90

seconds

with

C-60

cassette

tape

MIC;

sensitivity

0.25

mV/applicable

microphone

impedance

6002

~

20

KQ

LINE;

sensitivity

60

mV/input

impedance

47

KQ

NE;

output

level

0.42

V/load

impedance

50

KQ

over

HEADPHONE;

output

level

60

mV/82

5P

DIN

type

1-HPF

head

for

record/playback

1-ferrite

head

for

erasing

41.0em(W)

X

14.2cm(H)

X

32.

1cm(D)

7kg

Specifications

are

subject

to

change

without

notice.

Technics

Matsushita

Electric

Trading

Co.,

Ltd.

P.O.

Box

288,

Central

Osaka

Japan

LOCATION

OF

CONTROLS

AND

COMPONENTS

QO

@O@®

©)

a

19

4

Fig.

1

@)

@

Cassette

compartment

door

Headphones

jack

XK

@

Dolby

noise-reduction

switch

(4

Pause

button

@®

Bias

selector

@5

Stop

button

@

Equalization

selector

(6)

Playback

button

(8)

Peak-signal-check

switch

()

Fast

forward

button

©

Peak

level/VU

meters

48)

Rewind

button

@®

Power

switch

(M

Record

button

®)

Recording

indication

lamp

20

Eject

button

(9)

Output

level

control

@)

Line

output

jacks

40

Tape

counter

and,reset

button

@)

Input

selector

4)

Input

level

controls

@)

Record/playback

q2)

Microphone

jacks

@

Line

input

jacks

3

Dolby

is

the

trade

mark

of

Dolby

Laboratories

Inc

DISASSEMBLY

INSTRUCTIONS

(A)

?

6:

Screws

(B):

Screws

E)

:

Screws

(C):

Screws

(D):

Screws

(D):

Screws

Procedure

To

remove

--—.

Remove

——.

;

Shown

in

fig.

——.

Case

cover

i

2,3

Bottom

cover

4

Front

panel

»),

i

;

5,6

Mechanism

).

:

5,6

Main

circuit

board

|

(G),

7

*

When

the

main

circuit

board

is

installed,

be

sure

that

the

slide

switch

and

the

record/playback

select

lever

are

placed

in

proper

position.

(See

fig.

8)

Main

circuit

board

(See

fig.

5)

Fig.

8

ADJUSTMENTS

Before

measuring

and

adjusting

“Overall

frequency

response’,

“Overall

distortion”

and

“Overall

S/N

ratio’,

confirm

that

the

characteris-

tics

of

5

items

below

are

within

standard

which

have

much

relation

to

or

influence

on

electrical

performances

above.

1.

5.

Head

azimuth

adjustment.

2.

Bias

current.

3.

Playback

gain.

4.

Overall

gain.

Playback

frequency

response.

TEST

INSTRUMENTS

1

2.

Prepare

test

instruments

which

are

equivalent

in

accuracy

to

those

shown

below.

The

test

instruments

should

be

inspected

and

corrected

by

specialists

once

every

6

months,

because

a

long

period

of

use

without

maintenance

may

increase

errors

in

indication.

_

Warm-up

the

test

instruments

for

30

minutes

and

the

set

to

be

measured

for

10

minutes

before

taking

the

measurements.

If

not,

there

may

arise

an

error

or

difference

between

the

initial

value

and

the

stabilized

value

measured

after

“aging”.

.

Specifications

of

test

instruments.

(1)

Audio

frequency

oscillator

(2)

a.

Oscillation

frequency

:

5Hz~500

kHz

(5

ranges)

b.

Frequency

tolerance:

+(3%

+1Hz)

c.

Sine

wave

*

Output

voltage:

5Vrms

+

10%

(without

load)

*

Output

frequency

response:

Within

£0.2dB,

20Hz~

20kHz

(at

25°C)

2.5Vrms

+10%

(with

6002

load)

Within

+0.5dB,

5Hz~500

kHz

*

Distortion

factor:

Not

more

than

0.05%,

200

Hz

~

20

kHz

Not

more

than

0.5%,

5Hz~

500

kHz

*

Output

impedance:

6002

unbalanced,

within

+15%

*

Output

attenuator

:

0,

20dB,

Error:

within

+0.2dB

d.

Temperature

in

use

of

set:

|

Temperature=0~

40°C,

Humidity

=

90%

or

less

Automatic-stop

distortion

meter

(with

vacuum

tube

voltmeter)

A.

Distortion

factor

measurement

a.

Frequency

:

400Hz,

1kHz

10%

(fundamental

wave)

b.

Measurement:

0.1~

100%

(6

ranges)

c.

Input:

50mV~50V

d.

Fundamental

wave

attenuation:

60

dB

or

more

B.

Level

measurement

a.

Measurement:

1mV

(—60dB)

~

30

V

(30dB)

(9

ranges)

b.

Frequency

response:

20Hz~100kHz

+0.3dB

(1

kHz

basis)

c.

Input

impedance:

1MQ

+£10%,

less

than

50

pF

d.

Error

in

indicated

value:

Within

+3%

at

1kHz

C.

Output

terminal

a.

Frequency

response:

10Hz~100kHz

+1dB

b

100kHz~1MHz

+3dB

.

Output

voltage:

1Vrms

+10%

(1kHz

sine

wave)

(3)

Attenuator

a.

Input

impedance:

6002

unbalanced

b.

Maximum

attenuation:

121dB

c,

Minimum

attenuation:

0.1dB

(4)

Oscilloscope

a.

Cathode

ray

tube:

Effective

ranges

8X

8cm

b.

Vertical

axis

*

Input

sensitivity

:

30

mV

~30

V/cm

*

Frequency

band:

DC

~2MHz

*

Transient

time:

180ns.

*

Input

impedance:

1MQ,

35

pF

c.

Horizontal

axis

*

Tuning

range:

30Hz~

2MHz

*

Sweep

time:

Llus~

100

ms/cm

*

External

sweep:

1

Vp-p/cm

or

more

(5)

Digital

electronic

counter

a.

Number

of

figure:

4

(decimal

system)

b.

Input

sensitivity:

100

mVrms

c.

Input

impedance:

1MQ,

40

pF

d,.

Frequency

measurement

range:

10Hz~

100kHz

e.

Counting

time:

0.1,

1,

10s

(6)

Wow

meter

a.

Measured

center

frequency

range:

3kHz

+4%

b.

Input

level

range:

30mV~3V

c.

Input

impedance:

About

50

KQ

unbalanced

d.

Measurement:

0.01~3%

(5

ranges)

e.

Indicator

error:

Maximum

error

in

indicated

value

+5%

in

each

range.

f.

Frequency

response:

Conforming

to

weighting

curve

characteristics

(WRMS),

JiS

C5551.

Flat

characteristics

(RMS)

0.5~200Hz,

within

—3dB

(4Hz

basis)

g.

Meter

indication

system:

Effective

value

indication,

conforming

to

JIS

C5551

h.

Meter

response

characteristic:

About

5~

7

sec.

|.

Oscillation

frequency:

3

frequencies

(3kHz,

3kHz

+3%)

J.

Temperature

range:

0~40°C

Il.

MEASUREMENT

CONDITIONS

1.

Standard

measurement

conditions

*

Ambient

temperature:

10~30°C

(50~86*)

*

Ambient

humidity:

30~90%

RH

*

Power

voltage

accuracy:

+3%

2.

Position

of

tape

recorder

*

When

measuring,

place

the

unit

under

test

in

a

horizontal

position.

3.

Oscillator

output

voltage

adjustment

*

Connect

the

equipments

as

shown

in

the

following

and

adjust

the

oscillator

output

control

knob

for

1V

(f=

1kHz)

through

the

attenuator

while

keeping

the

attenuator

at

OdB.

*

When

supplying

a

signal

to

the

tape

recorder

amplifier,

adjust

the

input

level

using

the

attenuator.

Output

Control

Knob

Resistor

600Q

;

:

Attenuator

Vaci

Audio

Frequency

vorneter

Oscillator

Oscilloscope

Wl.

TEST

TAPE

Test

tape

life

The

more

frequently

the

test

tape

is

used,

the

more

the

tape

characteristics

will

deteriorate

(e.g.

lowering

of

recorded

tevel,

worsening

of

frequency

response

particularly

in

high-frequency

range,

and

an

increase

in

wow

due

to

tape

elongation)

until

meas-

ured

values

become

unreliable.

Even

in

such

a

case

when

a

tape

is

not

used,

but

stored,

for

a

long

period

of

time,

tape

shows

deterioration

in

performance

because

of

self

damagenetization

due

to

storage

conditions,

etc.

Please

refer

to

the

tape

life

specification

and

use

care

not

to

use

a

tape

longer

than

its

rated

life

when

servicing.

Frequence

of

use:

Not

more

than

20

times

for

each

tape

length.

Storage

period:

Not

more

than

6

months.

%

Test

tape

PARTS

NO.

PARTS

NAME

SPECIFICATIONS

REMARKS

STANDARD

REC.

5

TIMES

REPETITIVE

RECORDING

LEVEL

&

FREQ.

TAPE

SPEED:

1-7/8

IPS.

(4.8CM/S),

RESPONSE

TAPE

FULL

TRACK

(10MIN.)

OdB:

STANDARD

REC.

LEVEL

(160pWb/mm)

—10dB

WOW

&

TAPE

TAPE

SPEED:

1-7/8

IPS.

(4.8CM/S),

SPEED

TAPE

3kHz

FULL

TRACK

(45

MIN.)

OdB:

250pWb/mm

-10

4B

TAPE

SPEED:

1-7/81PS.

(4.8CM/S),

AZIMUTH

TAPE

6.3kHz

FULL

TRACK

(15MIN)

0dB:

250pWb/mm

REFERENCE

BL

TAPE

(NORMAL

UNRECORDED

TAPE

(20MIN.)

REFERENCE

B

TAPE

(CrO2)

UNRECORDED

TAPE

(20

MIN.)

IV.

MEASUREMENT

&

ADJUSTMENT

METHOD

NOTE:

1.

Make

sure

heads

are

clean.

2.

Make

sure

capstan

and

pressure

roller

are

clean.

3.

Judgeable

room

temperature:

205°C

(68

£9°F)

4.

Dolby

NR

switch:

OUT

Pressure

of

pressure

roller

Equipment

:

*

Tension

gauge

(max.

500

gr)

Takeup

tension

Equipment:

*

Cassette

torque

meter

(SRK-CT

or

RP8063)

5.

Bias

selector:

LOW

6.

Equalizer

selector:

1204S

7.

Peak

check

switch:

OUT

8.

Output

level

control:

MAX.

MEASUREMENT

&

ADJUSTMENT

.

Place

UNIT

into

playback

mode.

.

Hook

the

tension

gauge

to

pressure

roller

lever

and

pull

it

in

the

direc-

tion

of

the

arrow

as

shown

in

fig.

9.

.

Measure

the

tension

at

the

moment

when

the

pressure

roller

moves

away

from

the

capstan.

Standard

Value:

400+

50

gr

Adjustment

method

Bend

the

part

(A)

of

the

pressure

roller

spring

in

either

direction

shown

by

the

arrow

until

the

correct

pressure

is

attained.

1.

Mount

cassette

torque

meter

on

UNIT.

2.

Place

UNIT

into

playback

mode

and

read

takeup

torque.

3.

Measure

several

times

and

determine

the

mean

value

Standard

Value:

55+15gr-cm

If

the

measured

value

is

not

within

standard,

firstly

clean

the

rotational

parts

of

the

mechanism

with

alcohol,

and

if

it

still

is

not

within

standard,

make

the

following

adjustment.

Adjustment

method

Adjust

by

turning

the

plate

spring

attached

in

the

takeup

reel

table

(See

fig.

10).

REMARKS

*

Playback

mode

.

Pressure

roller

roller

spring

Fig.

9

*

Playback

mode

Plate

spring

Fig.

10

Head

azimuth

adjustment

Equipment:

*

VTVM

*

Oscilloscope

*

Test

tape

(azimuth)---C-AA

Record/playback

head

adjustment

1.

Test

equipment

connection

is

shown

below.

LINE

OUT

Test

tape

Playback

mode

VTVM

Fig.

11

Oscilloscope

.

Play

azimuth

tape

(C-AA

6.3

kHz).

.

Adjust

record/playback

head

angle

adjustment

screw

(B)

in

fig.

12

so

that

output

level

at

LINE

OUT

becomes

maximum.

.

Measure

both

channels,

and

adjust

levels

for

equal

output.

.

After

adjustment

lock

head

adjustment

screw

with

lacquer.

*

Playback

mode

R/P

head

Tape

speed

Equipment:

*

Digital

electronic

counter

or

frequency

counter

(RP8067)

*

Test

tape---C-WAT

MEASUREMENT

&

ADJUSTMENT

Tape

speed

accuracy

1.

Test

equipment

connection

is

shown

below.

LINE

OUT

Test

tape

Playback

mode

Digital

electric

counter

Fig.

13

.

Play

test

tape

(C-WAT

3,000Hz),

and

supply

playback

signal

to

fre-

quency

counter.

.

Measure

this

frequency.

.

On

the

basis

of

3,000

Hz,

determine

value

by

following

formula:

Tape

speed

accuracy

=

(43

x

100]

%

where,

f

=

measured

value

.

Take

measurement

at

middle

section

of

tape.

Standard

Value:

+1.5%

|

Adjustment

method

1.

Play

the

test

tape

(middie).

2.

Adjust

the

tape

speed

adjustment

VR

shown

in

fig.

28

so

that

fre-

quency

becomes

3,000

Hz.

Tape

speed

fluctuation

Make

measurements

in

same

manner

as

above

(beginning,

middle

and

end

of

tape),

and

determine

difference

between

maximum

and

minimum

values

and

calculate

as

follows:

Tape

speed

fluctuation

=

(A508-

x

100]

%

fi

=maximum

value

f2

=

minimum

value

Standard

Value:

1%

|

REMARKS

*

Playback

mode

Wow

and

flutter

Equipment:

*

Wow

meter

*

Test

tape---C-WAT

1.

Test

equipment

connection

is

shown

below.

LINE

OUT

Test

tape

Playback

mode

Wow

meter

Fig.

14

.

Use

wow

test

tape

(3,000Hz)

and

measure

the

playback

signal

on

wow

meter.

.

Wow

and

flutter

is

expressed

in

percentage

and

that

measurernent

can

be

weighted

by

JIS

network

(WRMS).

.

Measure

at

middle

section

of

test

tape.

Standard

Value:

0.12

%

(WRMS)

+

Playback

mode

Playback

frequency

response

Equipment:

*VTVM

*

Oscilloscope

*

Test

tape---C-FH

MEASUREMENT

&

ADJUSTMENT

.

Test

equipment

connection

is

as

same

as

“Head

azimuth

adjustment”

but

use

the

test

tape

(C-FH)

instead

of

head

azimuth

tape

(See

fig.

1):

.

Place

UNIT

into

playback

mode.

_

Play

frequency

response

test

tape

(C-FH).

.

Measure

output

level

at

10KHz,

8kHz,

4kHz,

1kHz,

125Hz

and

63Hz

and

compare

each

output

level

with

standard

frequency

333Hz,

at

LINE

OUT.

.

Make

measurement

for

both

channels.

.

Make

sure

that

the

measured

value

is

within

the

range

specified

in

the

frequency

response

chart.

Playback

frequency

response

chart

440

Hz

Fig.

15

.

If

measured

value

is

not

in

standard,

adjust

VR1

(L-CH),

VR2

(R-CH)

(See

fig.

28

on

page

14).

Playback

gain

Equipment:

*VTVM

*

Oscilloscope

*

Test

tape---C-FH

REMARKS

*

Playback

mode

.

Test

equipment

connection

is

shown

in

fig.

11.

.

Play

standard

recording

level

portion

on

test

tape

(C-FH

333Hz),

and

using

VTVM

measure

the

output

level

at

LINE

OUT

jack.

.

Make

measurement

for

both

channels.

|

Standard

Value:

0.42V

(—7dB)

Adjustment

1.

If

measured

value

is

not

standard,

adjust

VR3

(L-CH),

VR4

(R-CH)

(See

fig.

28

on

page

14)

2.

After

adjustment,

check

“Playback

frequency

response”

again.

*

Playback

mode

Playback

S/N

ratio

Equipment:

*VTVM

*

Oscilloscope

*

Test

tape---C-FH

*

Empty

cassette

est

equipment

connection

is

shown

in

fig.

11.

jay

standard

recording

level

test

tape

(C-FH

333Hz)

and

read

out-

ut

level

on

VTVM.

efer

to

“Playback

gain

adjustment”.

ace

empty

cassette

(which

has

been

cut)

and

play

again.

.

Measure

noise

level

at

this

time

using

VTVM,

and

determine

ratio

of

this

level

to

test

tape

output

signal

voltage

(333

Hz).

Standard

Value:

Greater

than

43dB

An

example

calculation

is

shown

below.

A:

Es

=

playback

output

signal

voltage

of

test

tape

(333

Hz)

B:

En=

playback

output

noise

level

Es=0.42V

(—7dB)

En

=

3.0mV

(—50dB)

i

Sr

ES

0.42V_

S/N

ratio

=

En

=

30mv

=

140

20

logio

140

=

43dB

S/N

ratio

=

Es(dB)

—

En(dB)

=

—7—(—50)=43dB

+

Playback

mode

Bias

current

Equipment:

*

VTVM

*

Oscilloscope

Erase

current

Equipment:

*

VTVM

*

Oscilloscope

*

Resistor

(1)

MEASUREMENT

&

ADJUSTMENT

1.

Test

equipment

connection

is

shown

below.

Record

mode

R1

(L-CH)

VTVM

Oscilloscope

Fig.

16

.

Place

UNIT

into

record

mode,

and

tape

selector

to

“NORMAL.”

(for

normal

tape).

.

Read

voltage

on

VTVM

and

calculate

bias

current

by

following

for-

mula:

Value

read

on

VTVM

(V)

10

(Q)

Bias

current

(A)

=

Standard

Value:

0.17+0.15mA

.

Adjust

L5

(L-CH),

and

L6

(R-CH)

(See

adjustment

part

location

on

page

14).

.

Then

changing

the

equalizer

selector

to

7OuS

and

bias

selector

to

HIGH

(for

CrOz

tape),

confirn

that

bias

current

become

greater

by

25%

than

that

for

normal.

.

Connect

12

resistor

between

ground

side

terminal

of

erase

head

and

ground

lead

wire

removed

(See

fig.

18).

.

Connect

VTVM

to

both

ends

of

1

resistor.

Erase

head

VTVM

Oscilloscope

Fig.

17

3.

Place

UNIT

into

record

mode

and,

measure

voltage

across

the

12

resistor.

4.

Determine

erase

current

with

the

following

formula:

Voltage

across

1Q

resistor

(V)

1(Q)

Erase

current

(A)

=

Standard

Value:

More

than

70mA

REMARKS

*

Record

mode

+

Be

sure

the

ground

end

of

the

meter

is

connected

to

the

ground

end

of

the

resistor.

+

When

bias

current

is

adjusted

on

one

channel

only,

note

that

bias

current

on

the

other

channel

may

vary.

+

Record

mode

Erase

head

BLACK

Fig.

18