Technics RS-B465 Manuale utente

ORDER

NO.

AD9005125C2

Service

Manual

Dolby

NR-Equipped

Stereo

Cassette

Deck

wots

B-C

PRO]

Pro

headroom

extension

originated

Bang

Olufsen

and

manufactured

under

license

from

Dolby

Laboratories

Licensing

Corporation.

“DOLBY”,

the

double-D

symbol,

and

‘‘HX

PRO”

are

trademarks

Dolby

Laboratories

Licensing

Corporation.

RS-B755

MECHANISM

SERIES

(AR350)

SPECIFICATIONS

CASSETTE

DECK

SECTION

Deck

system

Track

system

Stereo

cassette

deck

4-track,

2-channe|

Heads

Rec/Play

Erasure

Motors

Capstan

drive

servo

motor

Reel

table

drive

motor

Recording

sysiem

bias

Bias

frequency

80.

kHz

Erasing

system

erase

Tape

speed

4.8.

cm/sec.

(17/s

ips)

Frequency

response

NORMAL

Hz~15

kHz

(+3

dB)

Hz~15

kHz

(DIN)

CrO2

Hz~16

kHz

(+3

dB)

Hz~16

kHz

(DIN)

METAL

Hz~17

kHz

(+3

dB)

Hz~17

kHz

(DIN)

recording

level,

CrOz

type

tape)

(CCIR)

weighted)

S/N

(signal

jevel=

Dolby

off

Technics

Cassette

Deck

RS-B465

Color

(K)...Black

Type

Wow

and

flutter

Fast

forward

and

rewind

times

Approx.

Input

sensitivity

and

impedan

MIC

0.25

mV/6000~10

LINE

mV/47

Output

voltage

and

impedance

LINE

OUT

HEADPHONES

GENERAL

Power

consumption

Power

supply

For

Continental

Europe,

F.R.

Germany

and

italy

50/60

Hz,

220

50/60

Hz,

240

For

Great

Britain

Dimensions

(WXHxXD)

430

125x290mm

(1615/16

415/16”

1119/32

Weight

4.3

(9.5

1b.)

Note:

Specifications

are

subject

change

without

notice.

Weight

and

dimensions

are

approximate

Matsushita

Electric

Industrial

Co.,

Ltd.

Central

P.O.

Box

288,

Osaka

530-91,

Japan

RS-B465

CONTENTS

Page

ACCESSORIES

.......:cscsssssssssscsstensestsensssscsseasecesvarseeceesnnseseenserss

CONNECTIONS

.......cececscsssesssestssssssonsnsesesnsseeessstecseneseseserssecs

FRONT

PANEL

CONTROLS

AND

FUNCTIONG..............

3,4

DISASSEMBLY

INSTRUCTIONG...........ccscccssscseessseseersees

5~8

MEASUREMENT

AND

ADJUSTMENT

METHODES....

8~10

TERMINAL

FUNCTION

IC...........csccssersceressceosesecesseerss

INTERNAL

CONNECTION

.........::csssssessssssssscerseseeees

BLOCK

DIAGRAM

............ccsssssccossesssseseosseessesecreerseeseneees

13,14

TERMINAL

GUIDE

IC’S,

TRANSISTORS

AND

DIODES

bocce

nvetsendecctacsiestesccaideassbeasiccpocasbetsacessostcavesdecees

ACCESSORIES

power

supply

cord...

..........0

000

cee

eee

(SFDACOS5E03)...

(E,

(SJA193-1).........

(EB)

CONNECTIONS

Make

connections

the

numbered

sequence

using

the

in-

cluded

cables.

Connect

the

stereo

connection

cables.

Connect

the

power

supply

cord.

Receiver

amplifier

(not

included)

REC

PLAY

OUT

BACK

Household

outlet

Stereo

connection

cables.....................0005

(SJP2249-3)

power

supply

cord

(@)

The

configuration

the

outlet

and

power

supply

cord

dif-

fers

according

area.

For

United

Kingdoom

Household

outlet

Fit

suitable

plug

the

power

supply

cord.

pply

Placement

hints

this

unit

placed

near

receiver

tuner,

“hum”

noise

may

heard

during

tape

playback,

recording,

reception

the

receiver

the

tuner.

this

occurs,

leave

much

space

possible

between

the

units,

place

them

where

there

the

least

amount

“hum”.

Note:

This

unit

precision

instrument.

sure

place

flat

sur-

face.

RS-B465

FRONT

PANEL

CONTROLS

AND

FUNCTIONS

Control

section

Power

“standby

/on”

switch

(power/H

standby

on)

This

switch

switches

and

OFF

the

secondary

circuit

power

only.

The

unit

the

“standby”

condition

when

this

switch

set

the

standby

(!)

position.

Regardless

the

switch

setting,

the

primary

circuit

always

“live”

long

the

power

cord

connected

electrical

outlet.

(2)

Eject

button

eject)

This

button

can

used

open

the

cassette

holder.

(3)

Cassette

holder

Display

section

timer

counter

memory

peak

hold

reset

“

rec

off

-—

play

auto

manual

}

cue

and

review

Recording-level

control

(rec

level)

This

control

can

used

regulate

the

recording

level.

Recording-balance

control

(balance)

This

control

can

used

balance

the

left

and

right

sound

levels

during

recording.

Microphone

jacks

(mic)

Bias-adjustment

control

(bias

adjust)

The

frequency

response

for

each

tape

type

can

equalised

using

this

control.

Operation

section

Headphones

jack

(phones)

MPxX

filter;

aes

noise

reduction

——

B—DolbyNR—C

RS-B465

Operation

section

Timer

switch

timer)

This

switch

used

automatically

begin

tape

recording

tape

playback

certain

time,

selected

timer

(not

in-

cluded).

Counter

reset

button

(counter

reset)

This

button

can

used

reset

the

tape

counter

indication

“000”.

Memory-stop

button

(memory

stop)

This

button

can

used

rewind

the

tape

the

preset

“000”

point

when

the

rewind

(<4)

button

pressed.

Peak

hold

reset

button

(peak

hold

reset

auto/manual)

auto:

The

peak

level

the

source

held

and

displayed

for

approximately

one

second

time.

manual:

The

peak

level

the

source

held

and

displayed

continuously.

reset

the

peak

hold

function,

press

this

button

once

again.

Multiplex

filter

switch

(MPX

filter)

This

prevents

the

Dolby

circuit

from

operating

error

when

stereo

broadcasts

are

recorded

using

the

noise

reduction

function.

Dolby

noise-reduction

buttons

(noise

reduction)

These

buttons

can

used

reduce

the

hiss

noise

that

characteristic

tape.

This

unit

provided

with

both

the

Dolby

NR-type

and

NR-type

noise-reduction

systems.

@®

Record

button

(rec/®@)

This

button

can

used

change

the

tape

deck

the

recording

stand-by

mode.

@®

Automatic-record-muting

button

(auto

rec

mute/Q)

This

button

can

used

make

silent

interval

the

tape

being

recorded

tape

deck.

@®

Pause

button

(pause/#1)

This

button

can

used

temporarily

stop

the

tape

playback

recording

tape

deck.

Fast-forward/cue,

rewind/review

buttons

(cue/review/>

>./<<)

These

buttons

can

used

advence

rewind

the

tape.

During

playback

these

buttons

are

used

cue

review

while

listening

the

contents

high

speed.

Playback

button

(play/P)

This

button

can

used

start

the

playback

recording

the

cassette.

(The

tape

will

then

begin

moving

the

left-to-right

direction.)

Stop

button

(stop/H)

This

button

can

used

stop

tape

movement.

SUEDE

GEGGD

BURGE

GOURD

ROGUE

UGGS CREE

RBESD ROGGE

POON

-20

-15

—10

—6

-3

CURES

GRGEE

REGEE

CORTE

RUNEE

CRUUE

GERRS

BRAG

BOSON

SUES

’

Display

section

Recording

indicator

([%)

This

indicator

illuminates

indicate

that

this

tape

deck

is in

the

recording

stand-by

mode,

recording.

Playback

indicator

(play)

When

this

indicator

illuminates

steadily,

indicates

that

this

tape

deck

the

playback

mode

the

recording

mode.

When

flashes

continually,

this

indication

that

this

tape

deck

the

pause

mode

the

recording

stand-by

mode.

Input

level

meter

During

playback,

this

meter

indicates

the

level

the

recorded

sound.

During

recording,

indicates

the

level

being

recorded,

ad-

justed

the

recording-level

control.

Dolby

noise-reduction

indicators

({B],

[C])

Each

indicator

illuminates

show

the

type

Dolby

noise-

reduction

system

selected

pressing

one

the

Dolby

noise-

reduction

buttions.

Multipiex

filter

indicator

(MPX)

Iiluminates

indicate

that

the

multiplex

filter

set

“on”.

Memory-stop

indicator

(M.stop)

This

indicator

illuminates

indicate

that

this

tape

deck

is in

the

memory

stop

mode.

€@

Tape-select

indicators

The

type

tape

being

used

will

automatically

detected

and

the

indicator

will

iltuminate.

€)

Tape

counter

Indicates

the

amount

tape

movement.

RS-B465

=~)

DISASSEMBLY

INSTRUCTIONS

“ATTENTION

SERVICER”

Some

chassis

components

may

have

sharp

edges.

careful

when

disassembling

and

servicing.

Removal

the

cabinet

Removal

the

main

P.C.B.

Procedure

Remove

the

screws

(@~@).

1>2

Remove

the

rear

panel

from

the

projec-

tion

the

bottom

chassis.

Cabinet

Rear

Panel

Projection

Bottom

Chassis

Projection

Remove

the

screws

(9~@).

Remove

the

screws

(O~®).

Remove

the

connector

(CP1).

Remove

the

flat

cables

(CN2,

CN3,

CN4,

CN7).

Remove

the

main

P.C.B.

the

direction

the

arrow.

How

remove

the

flat

cable

Pull

out

the

flat

cable

while

Lift

the

connector.

pressing

the

connector.

Pull

out

the

flat

cable.

My.

Flat

Cable

Connector

Flat

Cable

Connector

’

Main

PC.B.

How

check

the

main

P.C.B.

When

checking

the

soldered

surfaces

main

P.C.B.

Remove

the

bottom

board

the

direction

the

ar-

and

replacing

the

parts,

show.

row

©.

Remove

the

screws

(@,

©,

@~®)

above

figure.

Reinstall

the

front

panel

the

main

P.C.B.

Remove

the

screws

(O~®).

Remove

the

front

panel

the

direction

the

arrow

RS-B465

Procedure

Remove

the

connector

(CP1).

Remove

the

flat

cables

(CN3,

CN4,

CN7).

Front

Panel

Remove

the

front

panel

the

direction

the

arrow.

Procedure

1-3-4

Knobs

Pull

out

the

knobs.

Remove

the

nut.

Remove

the

screws

(@~@).

Release

the

claws.

Remove

the

drive

P.C.B.

the

direction

the

arrow.

Removal

the

rec

level

P.C.B.

and

mic

jack

P.C.B.

Ref.

No.

Removal

the

operation

P.C.B.

Procedure

1-345

Mic

Jack

PC.B.

Removal

the

rec

level

P.C.B.

Remove

the

rec

level

P.C.B.

the

direction

the

arrow.

Removal

the

mic

jack

P.C.B.

Remove

the

mic

jack

P.C.B.

the

direction

the

arrow.

Procedure

1--3-—--4—6

Remove

the

screws

(@~®).

Release

the

claws.

RS-B465

Removal

the

mechanism

unit

Mechanism

Unit

Procedure

1-3-7

Eject

Button

Push

the

eject

button.

Remove

the

screws

(O~®).

Ref.

No.

Removal

the

damper

gear

Removal

the

cassette

holder

Procedure

1-3

7-8

1-3—-7-8

Remove

the

screw

(@).

Removal

the

power

switch/

headphones

P.C.B.

Remove

the

rib

the

direction

the

arrow.

Remove

the

cassette

holder

spring.

Procedure

1>3—-10

Power

Switch

/Headphones

PC.B.

Power

Switch

Button

Holder

Cassette

Holder

Remove

the

power

switch

button

pushing

from

behind

the

front

panel.

Remove

the

screws

(@, @).

Release

the

claw.

Remove

the

holder.

Pull

out

the

cassette

holder

the

direction

the

arrow.

PON

RS-B465

Procedure

1—3-10

Removal

the

eject

lever

and

eject

button

Eject

Lever

Eject

Lever

Push

the

claw

the

direction

the

arrow

®.

Puil

out

the

eject

button.

Remove

the

eject

lever

the

direction

the

arrow

©.

Removal

the

power

supply

P.C.B.

Procedure

1-12

Remove

the

flat

cable

(CN2).

Remove

the

screws

(@~®).

li’

MEASUREMENT

AND

ADJUSTMENT

METHODES

Measurement

Condition

Rec.

level

control;

Maximum

Balance

control;

Center

Timer

stand-by

switch;

Off

Make

sure

heads

are

clean

Noise

reduction

select

switch;

Off

Make

sure

capstan

and

pressure

roller

are

clean

MPX

filter

switch;

Off

Judgeable

room

temperature

20+5°C(68219°F)

Measuring

instrument

EVM(Electronic

Voltmeter)

ATT(Attenuator)

Oscilloscope

volimeter

Digital

frequency

counter

Resistor

(6000)

oscillator

Test

tape

Head

azimuth

adjustment

(8kHz,

-20dB);

QZZCFM

Playback

gain

adjustment

(315Hz,

0dB);

QZZCFM

Tape

speed

adjustment

(3kHz,

-10dB);

QZZCWAT

Overall

frequency

response,

Overall

gain

adjustment

Playback

frequency

response

(315Hz,

12.5kHz,

10kHz,

Normal

reference

blank

tape;QZZCRA

8kHz,

4kHz,

1kHz,

250Hz,

125Hz,

63Hz,

-20dB);

CrQz

reference

blank

tape;

QZZCRX

QZZCFM

Metal

reference

blank

tape;

QZZCRZ

HEAD

AZIMUTH

ADJUSTMENT

.Playback

the

azimuth

adjusment

portion

kHz,

-20

dB)

the

test

tape

(QZZCFM).

Vary

the

azimuth

adjusting

screw

until

the

outputs

the

L-CH

and

R-CH

are

maxi-

mized

and

the

lissajous

waveform,

illustrated,

ap-

proaches

degrees.

Note:

L-CH

and

R-CH

are

not

maximized

the

same

point,

adjust

the

point

where

the

levels

each

channel

are

maximized

and

equal.

2.Perform

the

same

adjustment

the

play

mode.

After

the

adjustment,

apply

screwlock

the

azimuth

adjusting

screw.

TAPE

SPEED

ADJUSTMENT

1.Playback

the

middle

portion

the

test

tape

(QZZCWAT).

Adjust

the

VR901

that

the

output

within

the

standard

value.

Stardard

value:

3000

15Hz

PLAYBACK

GAIN

ADJUSTMENT

1.Playback

the

gain

adjusted

portion

(315

Hz,

0 dB)

the

test

tape

(QZZCFM).

Adjust

VR1

(L-CH)

and

VR2

(R-CH)

that

the

output

within

the

standard

value.

Standard

value:

0.4V+0.5dB

PLAYBACK

FREQUENCY

RESPONSE

1.Playback

the

frequency

response

portion

(315

Hz,

12.5

kHz

Hz,

-20

dB)

the

test

tape

(QZZCFM).

2.Assure

that

the

frequency

response

within

the

range

shown

Fig.

for

both

L-CH

and

R-CH.

LINE

OUT

OVERALL

GAIN

ADJUSTMENT

1.Insert

the

Normal

blank

test

tape

(QZZCRA)

and

set

the

unit

the

Record

pause

mode.

2.Apply

reference

input

signal

kHz,

-24

dB).

Attenuate

the

output

that

its

level

becomes

OV.

3.Record

this

input

signal.

4.Playback

the

signal

recorded

step

above

and

assure

that

the

output

within

the

standard

value.

not

within

the

standard

value,

adjust

VR3

(L-CH)

and

VR4

(R-CH).

6.Repeat

the

step

above

until

the

output

within

the

standard

value.

Standard

value:

0.4V

0.5dB

RS-B465

Record/

Playback

Head

Azimuth

Screw

Fig.2

LINE

OUT

Digital

frequency

counter

LINE

OUT

63Hz

100Hz

200Hz

|SO0OHZ

1kHz 2kHz

4kHz

Fig.6

LINE

OUT

oscillator

ATT

EVM

Oscilloscope

RS-B465

OVERALL

FREQUENCY

RESPONSE

1.Insert

the

Normal

blank

test

tape

(QZZCRA)

and

set

the

unit

the

Record

Pause

mode.

2.Apply

reference

input

signal

kHz,

-24

dB)

through

attenuator.

3.Attenuate

the

signal

and

adjust

the

frequency

from

10.0kHz.

4.Record

the

frequency

sweep.

5.Playback

the

recorded

signal

and

assure

that

within

the

range

shown

Fig.8

comparison

the

reference

frequency

kHz).

6.If

not

within

the

standard

range,

adjust

VR301

(L-CH)

and

VR302

(R-CH)

that

the

frequency

level

within

the

standard

range.

7.Repeat

steps

above

using

the

CrOz

tape(QZZCRX)

and

the

Metal

tape(QZZCRZ)

increasing

the

frequency

range

12.5kHz

(60Hz2~12.5kHz).

8.Assure

that

the

level

within

the

range

shown

Fig.9.

LINE

OUT

oscillator

ATT

EVM

Oscilloscope

Adjustment

points

MAIN

PC.B.

TAPE

SPEED

ADJ.

VR9OI

(XI)

VR302

VR30l

Normal

Overall

frequency

response

chart

(NR

OUT)

5OHz

100Hz

200Hz

SOOHZ

1kHz

2kHz

Fig.8

CrO,-Metal

Overall

frequency

response

chart

(NR

OUT)

5OKz

100Hz

200Hz

SO0H2

1kHz

2kHz

12.5kHz2

Fig.9

Line

Out

LJ]

PLAYBACK

GAIN

ADJ.

VRi

(Leh,

VR2(Rch)

OVERALL

GAIN

ADJ.

VR3(Lch),

VR4(Rch)

OVERALL

FREQUENCY

RESPONSE

ADJ.

VR3Ol(Lch),

VR302(Rch)

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