Technics RS-676US User manual

TAPE

RECOh.

Technics

Service

Manual

cee,

HI-Fl

STEREO

CASSETTE

DECK

WITH

FRONT

CONTROLS

AND

DOLBY*

NOISE

REDUCTION

SYSTEM

RS-676US

MECHANISM

SERIES

MODEL

RS-676US

SPECIFICATIONS

Power

Source:

AC:

90~109,

110~125,

200~219,

Frequency Response:

Normal

tape;

20~16,000

220~250

volts,

50/60

25~14,000

(DIN)

Power

Consumption:

25W.

30~13,000

(+3

dB)

Motors:

2-motor

system

CrOz2

tape:

20~18,000

1-Electronic

speed

contro!

motor

for

25~15,000

(DIN)

capstan

drive

30~14,000

(+3

dB)

1-DC

motor

for

reel

table

drive

Signal

Noise

Ratio:

Dolby

out;

Transistors:

28C1327

(6),

2SC644(2),

VU=250

PWb/mm)

28C828

(28),

2SC1318(3),

2SA719(1),

Dolby

in;

kHz

2SC1096Z

(3),

2SC1384

(3),

Harmonic

Distortion:

2.0%

1,000

Hz)

2SD288

(1),

2SA666H(3),

2SC945(2),

Inputs:

MIC:

sensitivity

0.3

mV/applicable

2S8C1407

(2),

2SK30(2)

microphone

impedance

600Q~

Head:

HPF

head

for

rec/playback

head

20KQ

Diode

Rectifiers:

1$1211(8),

OA90Z(20),

OA91

(3),

LINE:

sensitivity

mV/110KQ

MA162(10),

RD7A(2),

FR202(6),

TUNER:

sensitivity

100

mV/190

M21C(2),

EQA0119(1),

10DC1

(3),

Outputs

LINE:

output

level

420

(max.)

1ODC1R(2)

impedance

over

Track

System:

4-track

2-channel

stereo

recording

HEADPHONE:

output

level

mV/8Q

and

playback

Rec/PB

Connection:

DIN

type

Recording

System:

bias

(90

kHz),

erase

Fast

Forward

and

Approx.

second

with

C-60

cassette

Tape

Speed:

4.8cm/s,

(1-7/8

ips.)

Rewind

Time:

tape

Program

Time:

hour

stereo

recording

with

C-60

Dimensions:

410mm(W)

140mm

(H)

360mm

(D)

cassette

tape

16-3/8”

(W)

5-1/2”

(H)

14-3/87

(D)

Wow

and

Flutter:

0.063%

(WRMS)

,+0.15%

(DIN)

Weight:

10.5

Kg,

(23-1/8

ips.)

These

specifications

are

subject

change

order

accommodate

improvements

design.

Matsushita

Electric

Industrial

Co.,Ltd.

Baga

MATSUSHITA

ELECTRIC

TRADING

CO.,

LTD.

begga

P.O.

Box

288

Central,

Osaka,

Japan

LOCATION

PARTS

Q®@

@@OOO®

Ejection

button

Dolby

calibration

controls

Cassette

cover

Recording

level

control

Fast

forward

button

Tape

selector

Tape

counter

and

reset

button

Pause

button

Memory

playback

button

Record

button

Dolby

NR/MPX

Filte

Stop

button

Dolby

switch

Playback

button

Output

level

contro

Rewind

button

meters

Remote

control

jack

Peak-signal

check

button

Dolby

de-emphasis

switch

Input

source

selector

Tuner

input

jacks

Power

switch

Line

input

jacks

Headphones

jack

Record/playback

connection

socket

Microphone

jacks

Line

output

jacks

Recording

balance

control

Voltage

select

switch

Ground

terminal

DISASSEMBLY

INSTRUCTIONS

HOW

REMOVE

CASE

COVER,

BOTTOM

PANEL

AND

FRONT

PANEL

Procedure

How

remove-——

Remove——.

PCS.

Case

cover

(A)

(4)

Bottom

panel

(B)

(11)

Front

panel

©,©.©

©.@,

HOW

REMOVE

FRONT

ANGLE

AND

CASSETTE

COVER

Procedure

How

remove-——

Remove-——

Pcs.

Remarks

Front

angle

(7)

this,

condition,

front

angle

car

tilted

Front

angle

(G)

(2)

this

condition,

front

angle

can

removed

from

chassis.

Cassette

cover

(H)

(4)

;

NOTE:

Before

tilting

front

angle

(procedure

1),

remove

counter

belt

from

connection

pulley

and

hang

the

arrow

position

fig.

HOW

REMOVE

JACK

BASE

PLATE

AND

PRINTED

CIRCUIT

BOARD

(AMP

CONTROL)

Procedure

How

remove——

Remove——

Pcs.

Jack

base

plate

O.O.®

©.0.@

Printed

circuit

board

(CONTROL)

(L)

eee

ee ee

Printed

circuit

board

(AMP)

—

(6)

HOW

REMOVE

HEAD

COVER

Pushing

the

head

cover

shown

Tig.

and

lift

shown

fig.

Then

head

cover

can

removed.

ADJUSTMENTS

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

stablized

value

measured

after

“Warming

up”.

Specifications

Test

Instruments.

(1)

Audio

Frequency

Oscillator

Oscillation

Frequency

Hz~500

kHz

ranges)

Frequency

Tolerance

+(3%

Hz)

Sine

Wave

Output

Voltage

Vrms+10%

(open)

(at

25°C)

2.5

Vrms

+10%

(600Q

load)

Output

Frequency

Response

Within

+0.2dB

20Hz~20

kHz

Within

+0.5dB

5Hz~500

kHz

Distortion

Factor

Not

than

0.05%

200

Hz~20

kHz

Not

than

0.5%

5Hz,

500

kHz

Output

Impedance

600Q

Unbalanced

Within

+15%

Output

Attenuator

0,20dB

Error:

Within

+0.2

Temperature

Use

Set

Temperature=O0~40°C:

Humidity=90%

less

(2)

Automatic-spot

Distortion

Meter

(with

Vacuum

Tube

Voltmeter)

Distortion

Factor

Measurement

Frequency

(Fundamental

wave)

Measurement

Input

Fundamental

Wave

Attenuation

Level

Measurement

Frequency

Response

kHz

basis)

Input

Impedance

Error

Indicated

Value

Output

Terminal

Frequency

Response

Output

Voltage

Attenuator

400

kKHZz+10%

0.1~100%

range)

50mV~50V

—

(—60

dB)

~30

(30

cB)

range

Hz~100

kHz+0.3

1MQ+10%

Less

than

With

+3%

kHz

Hz~100

kHz+1

100

kHz~1

MHz+3

Vrms+10

KHz

Sine

Wave)

Input

Impedance

Maximum

Attenuation

Minimum

Attenuation

(4)

Oscilloscope

600Q

Unbalanced

“121

0.1

Cathode

Ray

Tube

Effective

Range

8cm

Vertical

Axis

Input

Sensitivity:

mV~30

V/cm

Frequency

Band:

DC~2

MHz

Transient

Time:

180

Input

Impedance:

TMQ,

Horizontal

Axis

Tuning

Range:

Hz~2

MHz

Sweep

Time:

lus~100

ms/cm

External

Sweep:

Vp-p/cm

(5)

Digital

Electronic

Counter

Number

Figures:

(decimal

system)

Inout

Sensitivity:

100

rms

Input

Impedance:

MQ,

Frequency

Measurement

Range:

Hz~100

kHz

Counting

Time:

0.1,1,10s

(6)

Wow

Meter

Measured

Center

Frequency

Range:

kHZz+4%

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

Characteristic

(WRMS),

JIS

C5551.

Flat

Characterstic

(RMS)

0.5~200

Hz,

Within

—3

basis)

Meter

Indication

System:

Effective

Value

Indication,

conforming

JIS

C5551

Meter

Response

Characteristic:

About

5~7

sec.

Oscillation

Frequency:

Frequencies

kHz,

kHz+3%)

Temperatur

Range:

O~40°C

;

lH.

MEASUREMENT

CONDITIONS

Standard

Measurement

Conditions

Ambient

Temperature:

10°~30°C

(50°~86°F)

Ambient

Humidity

30~90%

Power

Voltage:

Rated

Voltage=120

V+5%

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

contro!

knob

for

(f=1

kHz)

through

the

attenuator

while

keeping

the

attenuator

aB.

When

supplying

signal

the

tape

recorder

amplifier,

adjust

the

input

level

using

the

attenuator.

Connection

Test

Equipments.

Oscilloscope

‘

Attenuator

Vacuum

Tube

Audio

Frequency

Voltmeter

Oscillator

f=1kHz

Output

Voltage=1

dB)

Il.

TEST

TAPE

«x

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

measured

values

become

unreliable.

Even

such

case

where

tape

not

used,

but

stored,

for

Jong

period

time,

the

tape

shows

deterioration

performance

because

self

demagnet-

ization

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

TIMES

REPETITIVE

RECORDING

TAPE

SPEED:

1-7/8

IPS

(4.8CM/S),

FULL

TRACK

(10

MIN.)

STANDARD

REC.

LEVEL

FREQ.

RESPONSE

TAPE

dB:

STANDARD

REC

‘LEVEL

(160

PWb/mm)

FULL

TRACK

(45

MIN.)

-10

eee

kHz

TAPE

SPEED:

1-7/8

IPS

(4.8

CM/S).

dB:

250P

Wb/mm)

FULL

TRACK

(15

MIN.)

AZIMUTH

TAPE

6.3

TAPE

SPEED:

;

1-7/8

IPS

(4.8

CM/S).

dB:

250PWb/mm

REFERENCE

BLANK

TAPE

NORMAL

UNRECORDED

TAPE

(20

MIN.)

REFERENCE

BLANK

TAPE

CrOz

UNRECORDED

TAPE

(20

MIN.)

iV.

MEASUREMENT

ADJUSTMENT

METHOD

NOTE:

Make

sure

heads

are

clean.

Make

sure

capstan

and

pressure

roller

are

clean.

Judgeable

room

temperature:

20+5°C

(68+9°F)

Source

Selector:

ITEM

LINE

Dolby

Switch:

OUT

MEASUREMENT

ADJUSTMENT

Output

Level

Control:

MAX.

Tape

Select

Switch:

NORMAL

Dolby

NR/MPX

Filter

Switch:

OUT

REMARKS

Pressure

Roller

Equipment:

Cassette

Type

Tension

Gauge

(max.

500

gr)

Place

UNIT

into

playback

mode.

Hook

tension

gauge

pressure

roller

shaft

top

(A),

and

pull

gauge

direction

opposite

pressure

roller

against

capstan

(See

fig.

10).

Read

pressure

indicated

gauge

immediately

when

pres-

sure

roller

moves

away

from

capstan

and

stops

rotating.

Standard

Value:

400+50

Adjustment

method

Adjust

bending

the

(B)

part

the

pressure

roller

spring

(See

fig.

10).

Playback

Mode

Takeup

Tension

Equipment:

Cassette

Torque

Meter

(RP-8063N)

Mount

cassette

torque

meter

UNIT.

Place

UNIT

into

playback

mode

and

read

takeup

torque.

Measure

several

times

and

determine

the

mean

value.

Standard

Value:

55+15

gr-cm

the

measured

value

not

within

standard,

firstly

clean

the

rotational

parts

the

mechanism

with

alcohol,

and

still

not

within

standard,

make

the

following

adjustment.

Adjustment

method

Adjust

turning

the

plate

spring

attached

the

takeup

reel

table

(See

fig.

11).

Plate

Spring

Fig.

Head

Azimuth

Adjustment

Equipments:

VTVM

Oscilloscope

Test

Tape

(Azimuth)

.C-AA

«x

Tape

Path

Viewer

RT-8133

Record/playback

head

adjustment

Test

equipments

connection

shown

below.

LINE

OUT

(av)

(Test

Tape)

(Playback

Mode)

Fig.

Play

azimuth

tape

(C-AA

6.3

kHz).

Adjust

record/playback

head

angle

adjustment

screw

(C).

fig.

that

output

level

LINE

OUT

becomes

maxi-

mum.

;

Measure

both

channels,

and

the

level

difference

between

channels

shoud

minimised

adjusting.

After

adjustment

lock

head

adjustment

screw

with

lacquer.

(Oscilloscope)

Erase

head

adjustment

Test

equipments

connection

the

same

above

but

use

the

tape

path

viewer

(RT-8133)

stead

test

tape

(C-AA).

Play

this

tape.

Adjust

screw

(D)

shown

fig.

that

the

tape

may

not

get

curled

malformed

tape

guide

the

erase

head.

After

adjustment

lock

head

adjust

screw

with

lacquer.

Playback

Mode

Fig.

Erase

Head

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