Panasonic RS-612US-E User manual

ORDER

NO.

ARD-7707065C

Service

Manual

Cassette

Deck

10050093

1004988

SM=-RS612

RS-612

S-E

SERVICE

MANUAL

[

Front

Stereo

Cassette

Deck

with

Dolby*

Noise-Reduction

System,

Timer

Stand-By,

and

Bias

and

Equalization

Switches

RS-630U

MECHANISM

SERIES

Specifications

(Catalog

specifications

for

sales)

Power

requirement:

AC;

90~109/110~125/200~219/220

Fast

forward

and

~250V,

50/60Hz

rewind

time:

Approx.

seconds

with

C-60

cassette

tape

Power

consumption;

Input:

MIC;

sensitivity

0.25

mV/applicable

microphone

Motor:

1-electronic

speed

contro!

motor

impedance

4002~20KQ

Track

system:

4-track,

2-channel

stereo

recording

and

playback

LINE

;

sensitivity

mV/input

impedance

Tape

speed:

4.8cm/s

DIN;

sensitivity

0.25

mV/input

impedance

1.8KQ.

Wow

and

flutter:

0.12%

(WRMS),

+£0.25%

(DIN)

LINE;

output

level

420

mV/load

impedance

over

Frequency

response:

CrO2z

tape;

30~15,000Hz

40~14,000Hz

(DIN)

Head:

2-head

system

Normal

tape;

30~

13,000Hz

l-super

permalloy

head

for

record/playback

12.000

(DIN)

1-double-gap

ferrite

head

for

erasure

Signal-to-noise

ratio:

Dolby

in;

(above

kHz)

Dimensions:

41.0cm(W)

13.6cm(H)

24.4cm(D)

Dolby

out;

55dB

Weight:

4kg

(signal

level

max.

recording

level)

Specifications

are

subject

change

without

notice.

‘a

National

Panasonic

pareeniiy

Cleattic

Medina

Co.

LOCATION

CONTROLS

AND

COMPONENTS

QDO®

©)

®O®D

1913

Fig.

Door

open

button

Rewind

button

Recording

indication

lamp

Power

switch

(®

Fast

forward

button

48)

Dolby

noise-reduction

switch

Cassette

compartment

door

Playback

button

Bias

selector

Tape

counter

and

reset

button

Stop

button

Equalizer

selector

)

Level/VU

meter

Pause

button

Input

selector

Headphones

jack

Timer

stand-by

button

Line

output

jacks

@®

Eject

button

Microphone

jacks

@3)

Record/playback

connection

socket

Record

button

d6)

Record

level

adjustment

Line

input

jacks

DISASSEMBLY

INSTRUCTIONS

Fig.

remove

Remove:

-—-.

Shown

fig.

-——

Case

cover

Bottom

cover

Main

P-C.B.

Mechanism

ADJUSTMENTS

Before

measuring

and

adjusting

“Overall

frequency

response’,

“Overall

distortion”

and

“Overall

S/N

ratio”,

confirm

that

the

characteris-

tics

items

below

are

within

standard

which

have

much

relation

influence

electrical

performances

above.

Head

azimuth

adjustment.

Bias

current.

Playback

gain.

Overall

gain.

Playback

frequency

response.

TEST

INSTRUMENTS

Prepare

test

instruments

which

are

equivalent

accuracy

those

shown

below.

The

test

instruments

should

inspected

and

corrected

specialists

once

every

months,

because

long

period

use

without

maintenance

may

increase

errors

indication.

Warm-up

the

test

instruments

for

minutes

and

the

set

measured

for

minutes

before

taking

the

measurements.

not,

there

may

arise

error

difference

between

the

initial

value

and

the

stabilized

value

measured

after

“aging”.

Specifications

test

instruments.

(1)

Audio

frequency

oscillator

Oscillation

froquency:

5Hz~

500

kHz

ranges)

Frequency

tolerance:

+(3%

+1Hz)

Sine

wave

Output

voltage

(at

25°C):

Vrms

10%

(without

load)

2.5Vrms

10%

(with

6002

load)

Output

frequency

response:

Within

£0.2dB,

20Hz~

kHz

Within

+0.5dB,

5Hz~

500

kHz

Distortion

factor:

Not

than

0.05%,

200

kHz

Not

than

0.5%,

5Hz~

500

kHz

Output

impedance:

6002

unbalanced,

within

15%

Output

attenuator:

OdB,

20dB,

Error:

within

+0.2dB

Temperature

use

set:

Temperature

= 0

40°C,

Humidity

=90%

less

(2)

Automatic-stop

distortion

meter

(with

vacuum

tube

voltmeter)

Distortion

factor

measurement

Frequency

(fundamental

wave):

400Hz,

1kHz

+10%

Measurement:

;

0.1~

100%

ranges)

Input:

50mV

~50V

Fundamental

wave

attenuation:

60dB8

Level

measurement

Measurement:

1mV

(—60dB)

~30V

(30dB)

ranges)

Frequency

response

kHz

basis):

20Hz~

100kHz

+0.3dB

Input

impedance:

1MQ

+10%,

less

than

Error

indicated

value:

Within

£3%

1kHz

Output

terminal

Frequency

response:

10Hz~100kHz

£1dB

100kHz~1MHz

+3dB

Output

voitage:

Vrms

10%

(1kHz

sine

wave)

(3)

Attenuator

Input

impedance:

6002

unbalanced

Maximum

attenuation:

121dB

Minimum

attenuation:

0.1dB

servis

(4)

Oscilloscope

Cathode

ray

tube:

Effective

ranges

8cm

Vertical

axis

Input

sensitivity

V/cm

Frequency

band:

~2MHz

Transient

time:

180ns.

Input

impedance:

1MQ,

Horizontal

axis

Tuning

range:

30Hz

MHz

Sweep

time:

lus~100ms/cm

External

sweep:

1Vp-p/cm

(5)

Digital

electronic

counter

Number

figure:

(decimal

system)

Input

sensitivity:

100

mVrms

Input

impedance:

1MQ,

Frequency

measurement

range:

100

kHz

Counting

time:

0.1,

10s

(6)

Wow

meter

Measured

center

frequency

range:

3kHz

Input

level

range:

30mV~3V

Input

impedance:

About

unbalanced

Measurement:

0.01~3%

ranges)

Indicator

error:

Maximum

error

indicated

value

+5%

each

range.

Frequency

response:

Conforming

weighting

curve

characteristics

(WRMS),

JIS

C5551.

Flat

characteristics

(RMS)

0.5~200Hz,

within

—3dB

(4Hz

basis)

Meter

indication

system:

Effective

value

indication,

conforming

JIS

C5551.

Meter

response

characteristic:

About

sec.

Oscillation

frequency

frequencies

(3kHz,

3kKHz

+3%)

Temperature

range:

O0~40°C

ll.

MEASUREMENT

CONDITIONS

Standard

measurement

conditions

Ambient

temperature:

10~30°C

(50~86*)

Ambient

humidity

30~90%

Power

voltage

accuracy:

+3%

Position

tape

recorder

When

measuring,

place

the

unit

under

test

horizontal

position.

Oscillator

output

voltage

adjustment

Connect

the

equipments

shown

the

following

and

adjust

the

oscillator

output

control

knob

for

(f=1kHz)

through

the

attenuator

while

keeping

the

attenuator

OdB.

When

supplying

signal

the

tape

recorder

amplifier,

adjust

the

input

level

using

the

attenuator.

Output

control

knob

Resistor

600Q

Audio

frequency

oscillator

Attenuator

Vacuum

tube

voltmeter

Oscilloscope

lil.

TEST

TAPE

Test

tape

life

The

frequently

the

test

tape

used,

the

tape

characteristics

will

deteriorate

(e.g.

lowering

recorded

level,

worsening

frequency

response

particularly

high-frequency

range,

and

increase

wow

due

tape

elongation)

until

meas-

ured

values

become

unreliable.

Even

such

case

when

tape

not

used,

but

stored,

for

long

period

time,

tape

shows

deterioration

performance

because

self

damagenetization

due

storage

conditions,

etc.

Please

refer

the

tape

life

specification

and

use

care

not

use

tape

longer

than

its

rated

life

when

servicing

Frequence

use:

Not

than

times

for

each

tape

length.

Storage

period:

Not

than

months.

Test

tape

PARTS

NO.

PARTS

NAME

SPECIFICATIONS

REMARKS

STANDARD

REC.

TIMES

REPETITIVE

RECORDING

LEVEL

FREQ.

TAPE

SPEED:

1-7/8IPS.

(4.8CM/S),

RESPONSE

TAPE

FULL

TRACK

(10

MIN.)

OdB:

STANDARD

REC.

LEVEL

(160pWb/mm)

—10dB

WOW

TAPE

SPEED:

1-7/8IPS.

(4.8CM/S),

SPEED

TAPE

3kHz

FULL

TRACK

(45MIN)

OdB:

250pWb/mm

-10

TAPE

SPEED:

1-7/8IPS.

(48CM/S).

AZIMUTH

TAPE

6.3kHz

FULL

TRACK

(15MIN)

0d8:

250pWb/mm

REFERENCE

BLANK

TAPE

(NORMAL)

UNRECORDED

TAPE

(20MIN.)

REFERENCE

BLANK

ESO

UNRECORDED

TAPE

(20MIN.)

IV.

MEASUREMENT

ADJUSTMENT

METHOD

NOTE:

Make

sure

heads

are

clean.

Dolby

switch:

OUT

Make

sure

capstan

and

pressure

roller

are

clean.

Bias

selector:

LOW

Judgeable

room

temperature:

20+5°C

(68

+9°F)

Equalizer

selector:

120uS

ITEM

MEASUREMENT

ADJUSTMENT

REMARKS

Pressure

pressure

roller

Place

UNIT

into

playback

mode.

Playback

mode

Equipment:

Hook

the

tension

gauge

pressure

roller

lever

and

pull

the

direc-

tion

the

arrow

shown

fig.

Measure

the

tension

the

moment

when

the

pressure

roller

moves

away

from

the

capstan.

Standard

Value:

400+

Tension

gauge

(max.

500

gr)

Adjustment

method

Bend

the

part

(A)

the

pressure

roller

spring

either

direction

shown

the

arrow

until

the

correct

pressure

attained.

spring

Fig.

Takeup

tension

Mount

cassette

torque

meter

UNIT.

Playback

mode

Equipment:

Place

UNIT

into

playback

mode

and

read

takeup

torque.

Cassette

torque

meter

Measure

several

times

and

determine

the

mean

value

(SRK-CT

RP8063)

Standard

Value:

55+

gr-cm

Playback

mode

Head

azimuth

adjustment

Record/playback

head

adjustment

Equipment:

Test

equipment

connection

shown

below.

VTVM

Oscilloscope

Test

tape

(azimuth)---C-AA

R/P

head

LINE

OUT

Test

tape

Playback

mode

VIVM

Oscilloscope

Fig.

Play

azimuth

tape

(C-AA

6.3

kHz).

Adjust

record/playback

head

angle

adjustment

screw

(B)

fig.

Fig.

that

output

level

LINE

OUT

becomes

maximum.

Measure

both

channels,

and

adjust

levels

for

equal

output

After

adjustment

lock

head

adjustment

screw

with

lacquer.

Tape

speed

Equipment:

Test

tape---C-WAT

Digital

electronic

couriter

frequency

counter

(RP8067)

MEASUREMENT

ADJUSTMENT

Tape

speed

accuracy

Test

equipment

connection

shown

below.

LINE

OUT

Test

tape

Playback

mode

Fig.

quency

counter.

Measure

this

frequency.

Tape

speed

accuracy

100)

where,

measured

value

Take

measurement

middle

section

tape.

]

Standard

Value:

1.5%

Adjustment

method

Play

the

test

tape

(middle).

quency

becomes

3,000

Hz.

Tape

speed

fluctuation

values

and

calculate

follows:

Tape

speed

fluctuation

(Sat-

100}

=maximum

value

minimum

value

Standard

Value:

Digital

electric

counter

Play

test

tape

(C-WAT

3,000Hz),

and

supply

playback

signal

fre-

the

basis

3,000Hz,

determine

value

following

formula:

Adjust

the

tape

speed

adjustment

shown

fig.

that

fre-

Make

measurements

same

manner

above

(beginning,

middle

arid

end

tape),

and

determine

difference

between

maximum

and

minimum

REMARKS

Playback

mode

Wow

and

flutter

Equipment:

Wow

meter

Test

tape---C-WAT

Test

equipment

connection

shown

below

LINE

OUT

Test

tape

Playback

mode

Wow

meter

Fig.

wow

meter.

can

weighted

JIS

network

(WRMS).

Measure

middle

section

test

tape.

Standard

Value:

0.17%

(WRMS)

Use

wow

test

tape

(3,000Hz)

and

measure

its

playback

signal

Wow

and

flutter

expressed

percentage

and

that

measurement

Playback

mode

Playback

frequency

Test

equipment

connection

same

“Head

azimuth

adjustment”

MEASUREMENT

ADJUSTMENT

REMARKS

Playback

mode

response

Equipment:

*VTVM

Oscilloscope

Test

tape---C-FH

Playback

gain

Equipment:

*VTVM

Oscilloscope

Test

tape---C-FH

but

use

the

test

tape

(C-FH)

instead

head

azimuth

tape

(See

fig.

11).

Place

UNIT

into

playback

mode.

Play

frequency

response

test

tape

(C-FH).

Measure

output

level

10kHz,

8kHz,

4kKHz,

1kHz,

125Hz

and

63Hz

and

compare

each

output

level

with

standard

frequency

333Hz,

LINE

OUT.

Make

measurement

for

both

channels.

Make

sure

that

the

measured

value

within

the

range

specified

the

frequency

response

chart.

Playback

frequency

response

chart

400H2

125Hz

—

250Hz

6.3kHz

10kHz

Fig.

Adjustment

the

measured

value

decreases

high

frequency

range.

Short

the

connection

point

(A)

unsolder

connection

point

(C)

See

fig.

page

12.

the

measured

value

increases

high

frequency

range

Short

the

connection

point

(B)

(C).

Test

equipment

connection

shown

fig.

Play

standard

recording

level

portion

test

tape

(C-FH

333

Hz),

and

using

VTVM

measure

the

output

level

LINE

OUT

jack

Make

measurement

for

both

channels.

Playback

mode

Standard

Value:

0.42V

(—7dB)

Adjustment

measured

value

not

standard,

adjust

VR3

(L-CH),

VR4

(R-CH)

(See

fig.

page

12)

After

adjustment,

check

“Playback

frequency

response”

again

Playback

S/N

ratio

Equipment:

VTVM

Oscilloscope

Test

tape---C-FH

Empty

cassette

Play

standard

recording

level

test

tape

(C-FH

333Hz)

and

read

out-

Test

equipment

connection

shown

fig.

put

level

VTVM.

Refer

“Playback

gain

adjustment”.

Place

empty

cassette

(which

has

been

cut)

and

play

again.

Measure

noise

level

this

time

using

VTVM,

and

determine

ratio

this

level

test

tape

output

signal

voltage

(333

Hz)

Playback

mode

[FS

CpG

}

Standard

Value:

Greater

than

46dB

MEASUREMENT

ADJUSTMENT

exampie

calculation

shown

below.

playback

output

signal

voltage

test

tape

(333Hz)

En=playback

output

noise

level

=0.42V

(—7dB)

En=2.1mV

(—53

dB)

0.42V

S/N

ratio

OmV

200

logio

200

46dB

S/N

ratio

Es(dB)

—

En(dB)

—7

—(—53)

=46dB

REMARKS

Bias

current

Equipment:

*VTVM

Oscilloscope

Test

equipment

connection

shown

below

TPL{L-CH)

TP2{R-CH)

Record

mode

R5(L-CH)

R6(R-CH)

VTVM

Oscilloscope

Fig.

Place

UNIT

into

record

mode,

and

bias

selector

“LOW”.

Read

voltage

VTVM

and

calculate

bias

current

following

for-

mula:

Value

read

VTVM

(V)

(Q)

Bias

current

(A)

Standard

value:

500!

fea%A

(LOW

position)

600

290#A

—150uA

(HIGH

position)

Adjust

(L-CH)

and

(R-CH)

(See

adjustment

part

location

page

12)

Then

changing

the

bias

selector

“HIGH”,

confirm

that

bias

current

become

greater

25%

than

that

for

normal.

Record

mode

sure

the

ground

end

the

meter

connected

the

ground

end

the

resistor.

When

bias

current

the

adjusted

one

channel

only,

note

that

bias

current

the

other

channel

may

vary

When

the

replaced,

preset

core

position

bottom

side

coil

and

then

readjust

optimum

bias

current.

Erase

current

Equipment:

*VTVM

Oscilloscope

Resistor

(0.19)

Connect

0.12

resistor

between

ground

side

terminal

erase

head

ground

lead

wire

removed

(See

fig.

14).

Connect

VTVM

both

ends

0.1

resistor

Erase

head

Record

mode

VTVM

Oscilloscope

Fig.

Place

UNIT

into

record

mode,

and

measure

voltage

across

the

0.122

resistor.

Determine

erase

current

with

the

following

formula:

Erase

current

(A)

Standard

value:

100£40mA

(LOW

position)

120450

(HIGH

position)

Record

mode

Erase

head

Fig.

ITEM

Overall

gain

Equipment:

oscillator

VTVM

ATT

Oscilloscope

Test

tape

(reference

biank

tape)

C-RA

for

Normal

Level

meter

Equipment

VTVM

Oscilloscope

oscillator

ATT

MEASUREMENT

ADJUSTMENT

Test

equipment

connection

shown

fig.

15.

Record

mode

LINE

oscillator

Test

tape

R/P

head

Playback

mode

VTVM

Oscilloscope

Test

tape

Fig.

Place

UNIT

into

record

mode,

and

equalizer

selector

1204S,

bias

selector

LOW

(for

normal

tape).

Supply

kHz

signal

(—24dB)

from

oscillator,

through

ATT,

LINE

IN.

Adjust

ATT

until

monitor

level

LINE

OUT

becomes

0.42

(—7

dB).

Using

test

tape

(C-RA),

make

recording

Playback

recorded

tape,

and

make

sure

the

value

LINE

OUT

VTVM

becomes

0.42

measured

value

not

0.42

adjust

VR5

(L-CH),

VR6

(R-CH)

(See

fig.

page

12).

Repeat

from

step

(2).

Supply

1kHz

signal

(~24dB)

from

oscillator,

through

ATT,

LINE

jack.

Place

UNIT

into

record

mode.

Adjust

ATT

until

monitor

level

LINE

OUT

becomes

0.42

Short

open

the

connection

point

{D)

and

(E)

that

meter

indi-

cates

O+

(See

fig.

page

12).

Overall

distortion

Equipment:

Distortion

meter

oscillator

ATT

Oscilloscope

Test

tape

(reference

blank

tape)

C-RA

for

Normal

C-RF

for

CrOs

REMARKS

Record/playback

mode

Record

level

contro

«MAX

Input

selector---LINE

Standard

input

level:

MIC

+++

—72+3dB

LINE

—24+3dB

DIN

+++

—362+3dB

Record

mode

Test

equipment

connection

shown

fig.

16.

LINE

R/P

head

“

aTT

6002

Record

mode

Test

tape

LINE

OUT

oscillator

R/P

head

Playback

mode

Distortion

meter

Fig.

Test

tape

Supply

1kHz

signal

LINE

and

adjust

ATT

that

output

level

LINE

OUT

indicates

0.42

(—

dB).

Make

recording.

Playback

and

measure

distortion

factor

output

signal.

Record

level

control

---

MAX

input

selector---LINE

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