Technics RS-B14 User manual

Dolby

В»

С

NR-Equipped

ORDER

NO.

HAD84052768C1

Service

Manual

Cassette

Deck

RS-B14

Stereo

Cassette

Deck

DC

poer

ecc

wn]

RS-636

MECHANISM

SERIES

Specifications

Deck

system:

Track

system:

Heads:

REC/PLAY;

Erasing;

Motor:

Recording

system:

Bias

frequency:

Erasing

system

Tape

speed:

Frequency

response:

Metal;

CrO;;

Normal;

S/N:

Stereo

cassette

deck

4-track,

2-channel

MX

head

Double-gap

ferrite

head

1

motor

system

AC

bias

80

kHz

AC

bias

4.8

cm/sec.

20

Hz~17

kHz

40

Hz—16

kHz

3

dB

20

Hz~17

kHz

40

Hz~15

kHz

X3

dB

20

Hz—16

kHz

40

Hz~14

kHz

+3

dB

(Signal

level=max

recording

level,

CrOz

type

tape)

Dolby

C

NR

in;

Dolby

B

NR

in;

NR

out;

75

dB

(CCIR)

67

dB(CCIR)

:

57

dB

(A

weighted)

Design

and

specifications

are

subject

to

change

without

notice.

*

Dolby'

and

the

double-D

symbol

are

trademarks

of

Dolby

Laboratories

Licensing

Corporation.

Technics

Matsushita

Engineering

and

Service

Company

50

Meadowland

Parkway,

Secaucus.

New

Jersey

07094

Color

|

(K)...Black

Type

(S)...Silver

Type

Area

usd

U.S.A.

[C]......

Canada.

Wow

and

flutter:

Fast

Forward

and

Rewind

Time:

Input

sensitivity

and

impedance:

MIC;

LINE;

Output

voltage

and

impedance:

LINE;

HEADPHONES;

Power

consumption:

Power

supply:

Dimensions

(WXHXD):

Weight

Matsushita

Electric

Panasonic

Hawaii

Inc.

91-238

Kauhi

St.

Ewa

Beach

P.O.

Box

774

Honolulu,

Hawaii

96808-0774

0.0796

(WRMS)

Approx.

110

seconds

with

C-60

cassette

tape

0.25

mV/4000-—10

КО

70

mV/47

КО

400

mV/1.8

КО

80

mV/8

Q

11W

AC

50

Hz/60

Hz,

120

V

430x108x220

mm

(1629/52"

x

48/32"

x

92152")

3.1

kg

(6

Ibs.

13

02.)

Panasonic

Sales

Company,

of

Puerto

Rico,

Inc.

Ave,

65

De

Infanteria,

KM

9.7

Victoria

Industrial

Park

Carolina,

Puerto

Rico

00630

of

Canada

Limited

5770

Ambler

Drive,

Mississauga,

Ontario,

LAW

2T3

Division

of

Matsushita

Electric

Ш

CONTENTS

ITEM

PAGE

*

Location

of

Controls

and

Components

.........

2

©

Safety

Ргесашйіопв5....................................

3

е

Insulation

Resistance

Test

........................

3

е

Disassembly

Instructions

...........................

3

*

Measurement

and

Adjustment

Methods

.........

5

е

Block

Піадгат........................................

10

•

Schematic

Diagram

.................................

12

ITEM

*

Electrical

Parts

List

.................................

е

Circuit

Boards

and

Wiring

Connection

Оіадгатї:

«susce

etium

rese Deme

sa

S

eri

des

*

Mechanical

Parts

Location

(included

Parts

List)

...........................

*

Cabinet

Parts

Location

(included

Cabinet,

Accessories

and

Packing

Parts

List)

......

Ш

LOCATION

OF

CONTROLS

AND

COMPONENTS

(D

Power

Switch

[power

(Ж

off

•

=

on)]

Recording

Indicator

[rec]

4%

Cassette

Holder

47

Tape

Counter

and

Reset

Button

[tape

counter

-

reset]

Input

Level

Control

[input

level)

@

Dolby

NR

Switch

[Dolby

NR

(ЖШ

out

•

=

in)]

(5)

FL

(fluorescent

level)

Meters

|

e

44

Balance

xl

© ©

|

Control

2

Eject

|

ӨТ

[||

[Ба!апсе

Виїїоп

—

©

(left

«

ecr

A

oat

;

г

center.

[eject

(4)]

[eTel

ше

right)]

@

Record

Button

[rec-

©

(9)]

(4)

Play

Button

[play-

(8)

Stop

Button

[stop

"uM

5

(>))

(6)

Rewind/Review

Button

[rew/rev

(44))

@

Tape

Selector

13

Microphone

Jacks

[tape

select

[mic

(left

»

right)]

(Normal

•

CrO;-

(2

Headphones

Jack

[phones]

Metal)]

17

Input

Selector

Pause

Button

[input

select

(Ж

line-

=

mic)]

[pause

(11)]

Dolby

NR

Select

Switch

“-(7)

Fast

Forward/Cue

[Dolby

NR

(IR

[E]

«

—

(hj

Button

[ff/cue

(PP

)]

7/09

Line

Input

Jacks

[LINE

IN

(L-R)]

7

À

Line

Output

Jacks

[LINE

OUT

(L

-R)]

Ш

SAFETY

PRECAUTIONS

(For

U.S.A.)

.

Before

servicing,

unplug

the

power

cord

to

prevent

an

electric

shock.

.

When

replacing

parts,

use

only

manufacturer's

recommended

components

for

safety.

.

Check

the

condition

of

the

power

cord.

Replace

if

wear

or

damage

is

evident.

.

After

servicing,

be

sure

to

restore

the

lead

dress,

insulation

barriers,

insulation

papers,

shields,

etc.

Aa

WPM

—

5.

Before

returning

the

serviced

equipment

to

the

customer,

be

sure

to

make

the

following

insulation

resistance

test

to

prevent

the

customer

from

being

exposed

to

a

shock

hazard.

Ш

INSULATION

RESISTANCE

TEST

(For

U.S.A.)

1.

Unplug

the

power

cord

and

short

the

two

prongs

of

the

plug

with

a

jumper

wire.

2.

Turn

on

the

power

switch.

3.

Measure

the

resistance

value

with

ohmmeter

between

the

jumpered

AC

plug

and

each

exposed

metal

cabinet

part,

such

as

screwheads,

antenna,

control

shafts,

handle

brackets,

etc.

Equipment

with

antenna

terminals

should

read

between

3MQ

and

5.2M

to

all

exposed

parts.

(Fig.

1)

Equipment

without

antenna

terminals

should

read

approximately

infinity

to

all

exposed

parts.

(Fig.

2)

*

Note:

Some

exposed

parts

may

be

isolated

from

the

chassis

by

design.

These

will

read

infinity.

Antenna

terminal

Exposed Exposed

metal

part

Ohmmeter

d

jussis

Fig.

1

Fig.

2

Resistance

=

3M2—5.2M&

Resistance

=

Approx

оо

4.

If

the

measurement

is

outside

the

specified

limits,

there

is

a

possibility

of

a

shock

hazard.

The

equipment

should

be

repaired

and

rechecked

before

it

is

returned

to

the

customer.

Ш

DISASSEMBLY

INSTRUCTIONS

The

head

azimuth

can

be

adjusted

by

removing

the

cassette

lid.

AC

power

transformer

Main

circuit

Record/playback

circuit

board

(о)

board

changing

wire

|

\

0

(К)

(0)

How

їо

remove

flat

cable

Flat

cable

White

line

Open

the

lid

of

connector

in

the

direction

of

the

arrow

as

shown

left-hand,

and

extract

the

flat

cable

to

disconnect.

Connector

(Flat

cable

connector)

FL

meter

circuit

board

Power

switch

circuit

board

(C)

Fig.

3

I

1

(9

1-Clamper

(N)

|

1

Motor

assembly

Volume

circuit

board

Fig.

6

Fig.

7

Shown

in

Ref.

No.

Procedure

To

remove

—.

Remove

—.

fig.

—

Case

cover

SB

SCIOWS

uestis

ener

ento

sa

P

ue

ER

due

(A)

1

*

As

shown

in

fig.

6,

raise

the

clampers

in

PDF

the

direction

of

arrow

@

and

remove

2

LED

«аин

баата

the

LED

circuit

board

іп

the

direction

S

of

arrow®

.

9

38СТӨМе

eux

dan

exti

иии

ушу

залы

eda

қада

юшде

da

ag

(B)

2

3

1-2-3

а

ie

e

Pull

out

the

connectors

[А]

[B].

...............

(С)

3

*

How

to

remove

flat

cable

[C]

[D]

F]

.........

(D)

|

3

--4--

|

RS-B14

|

Іш

2

Procedure

To

remove

—.

Remove

—.

ps

in

*

Push

the

eject

button

...........................

(E)

1

9.2

о

СТУС

езара

Yon

once

i

ep

NU

uS

rd

(F)

2

92

SCIOWS:

aus

sis

teria

cie

vel;

2

oi

ware

es

one

adie

арқар

(G)

5

қ

;

Remove

the

counter

Беії........................

(H)

5

4

1-4

M

:

echamsm

umit

*

Pull

out

the

connectors

[A]

[B]

...............

(C)

3

*

As

shown

in

fig.

3,

remove

the

record/

playback

changing

wire

in

the

direction

3

of

arrow

(3).

Г

ST

STEW

еа

Г

ЛУГ

ГКК

Г

mae

and

(J)

3

©“

SGEOW

аы

ал

нен

дббн

дублі

а

qu

(К)

3

*

As

shown

in

fig.

3,

remove

the

record/

playback

changing

wire

in

the

direction

3

5

1-2-5

Main

circuit

board

*

of

arrow

(8)

.

*

When

measuring

and

adjusting,

set

the

main

P.C.B.

as

shown

in

Fig.

4.

4

Then,

connect

the

ground

of

main

P.C.B.

and

the

bottom

case

with

a

wire.

6

1-6

EL

meter

circuit

board

*

How

to

remove

flat

cable

[D]

..................

(D)

3

%

2156ГЕ:

mens

mue

cec

scia

anus

ur

m

à

sae

DR

dd

(P)

5

*

How

to

remove

flat

cable

[C]

..................

(D)

*

As

shown

in

fig.

6,

raise

the

clampers

іп

7

1-6-7

Volume

circuit

board

the

direction

of

arrow

(1)

and

remove

6

the

volume

circuit

board

in

the

direction

of

arrow

(2).

8

1—8

Power

supply

circuit

€

DISGEOIMS.-

:

Haies

hassan

жай

arius

кке

жеміне

(L)

3

board

*

How

to

remove

flat

cable

[E]

fF]

...............

(D)

3

9

1-9

Power

switch

circuit

©

2:ISGIOWS.

sam eme

dr

eas

Soe

uae

ісігін

quos

mse

à

(M)

3

board

*

How

to

remove

flat

cable

[F]

..................

(D)

3

OISCIBWS.

Sans

зы

ес

ыс

ылы

ына

(М)

7

10

1-4-

й

|

18

Maier

assembly

е

2'SGIOWS:

ulis

suu

tke

ааа

адас

teet

à

(O)

7

ж

When

adjusting

in

record

mode,

fix

the

rec/play

switch

(51)

on

the

main

P.C.B.

at

“гес”

by

use

of

a

clip

or

the

like.

Ш

MEASUREMENT

AND

ADJUSTMENT

METHODS

NOTES:

e

Before

making

the

adjustment

and

measurement,

be

sure

to

read

“Ref.

No.

4:

to

remove

main

circuit

board”

of

“DISASSEMBLY

INSTRUCTION”.

Tape

speed

adjustment

VR

Jumper

wire

for

erase

current

adjustment

(J118)

A

=

ELE

VR10

Ф

CLEA

|

mi

уво

22}

тра

**7—TP3

2

c

VR2—qG&

ibs

Е

aie

|

d

|

Fig.

1

RS-B14

NOTES:

Set

switches

and

controls

in

the

following

positions,

unless

otherwise

specified.

*

Make

sure

heads

are

clean

*

Tape

selector:

Normal

*

Make

sure

capstan

and

pinch

roller

are

clean

*

Input

selector:

Line

in

e

Judgeable

room

temperature

20+5°C

(68+9°F)

*

Input

level

controls:

Maximum

*

NR

switch:

OUT

*

Balance

control:

Center

Q

Head

azimuth

Condition:

Equipment:

adjustment

*

Playback

mode

•

VTVM

е

Normal

tape

mode

*

Oscilloscope

*

Test

tape

(azimuth)...QZZCFM

L-CH/R-CH

output

balance

adjustment

терта

1.

Make

connections

as

shown

іп

fig.

2.

Reon

/

са

a

қаулай

ый

EA

[c

Ro

“ker

Playback

mode

VTVM

Oscilloscope

.

Playback

the

8kHz

signal

from

the

test

tape

(QZZCFM).

Fig.

2

Adjust

screw

(B)

in

fig.

3

for

maximum

output

L-CH

and

R-CH

levels.

Ig.

When

the

output

levels

of

L-CH

and

R-CH

are

not

at

maximum

at

the

c

Record/playback

same

point

adjust

as

follows.

ee

ngad

.

Turn

screw

(B)

shown

in

fig.

3

to

find

angles

A

and

C

(points

where

/

peak

output

levels

for

left

and

right

channels

are

obtained).

Then,

A

locate

angle

B

between

angles

A

and

C,

i.e.,

point

where

L-CH

and

Screw

(8)

R-CH

outputs

are

balanced.

(Refer

to

figs.

3

and

4.)

Fig.

3

L-ch

peak

level

R-ch

peak

level

1

Ж

ГА

L-CH/R-CH

phase

adjustment

LEVEL

|

4.

Make

connections

as

shown

in

fig.

5.

Playback

the

8kHz

signal

from

the

test

tape

(QZZCFM).

Adjust

screw

(B)

shown

in

fig.

3

so

that

pointers

of

the

two

VTVMs

swing

to

maximum

and

a

lissajous

waveform

as

illustrated

in

fig.

6

is

obtained

on

the

oscilloscope.

Record/

Oscilloscope

playback

head

Playback

D

mode

LINE

OUT

Vertical

Horizontal

Fig.

6

Fig.

5

g

Ө

Tape

speed

Condition:

Equipment:

*

Playback

mode

*

Digital

frequency

counter

*

Test

tape...

QZZCWAT

Tape

speed

accuracy

Record/

playback

LINE

OUT

head

.

Test

equipment

connection

is

shown

in

fig.

7.

о

.

Playback

test

tape

(QZZCWAT

3,000Н2),

and

supply

playback

signal

о

at

to

the

digital

frequency

counter.

Playpack

те

на

тТаШЕНЕ

conni

.

Measure

this

frequency.

.

On

the

basis

of

3,000Hz,

determine

value

by

following

formula:

Fig.

7

Tape

speed

accuracy

=

TOO

100(%)

where,

f

=

measured

value

.

Take

measurement

at

middle

section

of

tape.

Standard

value:

«1.596

.

If

measured

value

is

not

within

the

standard

value,

adjust

it

by

using

the

tape

speed

adjustment

VR

shown

in

fig.

1.

Note:

Please

use

non

metal

type

screwdriver

when

you

adjust

tape

speed

accuracy

on

this

unit.

Tape

speed

fluctuation

Make

measurements

in

same

manner

as

above

(beginning,

middle

and

end

of

tape),

and

determine

the

difference

between

maximum

and

minimum

values

and

calculate

as

follows:

f,-f

Tape

speed

fluctuation

=

3.000

х100(%)

fi

=

maximum

value,

f,

=

minimum

value

Standard

value:

Less

than

1%

RS-B14

©

Playback

frequency

Condition:

Equipment:

response

*

Playback

mode

*

VTVM

*

Normal

tape

mode

*

Oscilloscope

*

Test

tape...QZZCFM

1.

Test

equipment

connection

is

shown

in

fig.

2.

Playback

the

frequency

response

portion

of

test

tape

|

Playback

frequency

response

chart

(022СЕМ):

3.

Measure

output

level

at

315Hz,

12.5kHz,

8kHz,

4kHz,

1kHz,

amt

ШЕШІНЕ

ne

250Hz,

125Hz

and

63Hz,

and

compare

each

output

level

ІШ;

ИСЕН

9%

ul

with

the

standard

frequency

315Hz,

at

LINE

OUT.

4.

Make

measurements

for

both

channels.

ИН

СШ

5.

Make

sure

that

the

measured

values

are

within

the

range

|

-

=

ag

specified

in

the

frequency

response

chart.

(Shown

in

fig.

8).

ШІ

ao

ІШ

Sat

=

63H

H

н: H2 н:

н:

z

Fig.

8

©

Playback

gain

Condition:

Equipment:

*

Playback

mode

*

VTVM

*

Normal

tape

mode

*

Oscilloscope

*

Test

tape...QZZCFM

1.

Test

equipment

connection

is

shown

in

fig.

2.

Playback

standard

recording

level

portion

on

test

tape

(QZZCFM

315Hz)

and,

using

VTVM,

measure

the

output

level

at

LINE

OUT.

3.

Make

measurements

for

both

channels.

[

Standard

value:

0.4V+1dB

|

гар.

.

If

the

measured

value

is

not

within

the

standard,

adjust

VR1

(L-CH)

or

VR2

(R-CH)

(See

fig.

1).

B

After

adjustment,

check

"Playback

frequency

response"

again.

@

Erase

current

Condition:

Equipment:

*

Record

mode

•

VTVM

*

Metal

tape

mode

*

Oscilloscope

Erase

head

.

Test

equipment

connection

is

shown

in

fig.

9.

.

Place

UNIT

into

metal

tape

mode.

.

Press

the

record

and

pause

buttons.

.

Read

voltage

on

VTVM

and

calculate

erase

current

by

following

formula:

AON-

Record

mode

R84

(12

Voltage

across

resistor

R84

Fe

1

(Q)

Standard

value:

155+15mA

(Metal)

Erase

current

(A)

=

5.

If

the

measured

value

is

not

within

the

standard

value

adjust

it

by

following

the

adjustment

instructions.

Adjustment

*

|f

the

erase

current

is

more

than

170mA,

cut

the

jumper

wire

(See

fig.

1).

@

Overall

frequency

Condition:

Equipment:

response

*

Record/playback

mode

*

VTVM

*

Test

tape

*

Normal

tape

mode

*

ATT

(reference

blank

tape)

e

CrO,

tape

mode

*

AF

oscillator

...

QZZCRA

for

Normal

*

Metal

tape

mode

*

Oscilloscope

...QZZCRX

for

CrO,

*

Input

level

controls...

MAX

•

Resistor

(6009)

...QZZCRZ

for

Metal

Note:

Before

measuring

and

adjusting,

the

overall

frequency

response

make

sure

of

the

playback

frequency

response

(For

the

method

of

measurement,

please

refer

to

the

playback

fre-

quency

response).

Overall

frequency

response

chart

(Normal)

(Recording

equalizer

is

fixed)

1.

Make

connections

as

shown

in

fig.

11.

2.

Place

UNIT

into

normal

tape

mode

and

insert

the

normal

reference

blank

test

tape

(QZZCRA).

SO

үм

Жш 5ш

кш

Ж

We

100?

3.

Supply

а

1kHz

signal

from

the

AF

oscillator

through

ATT

to

LINE

IN.

-

i

K

4.

Adjust

АТТ

so

that

input

level

is

-20dB

below

standard

Р

|

i

5

recording

level

(standard

recording

level

=0

VU).

.

Adjust

the

AF

oscillator

frequency

to

1kHz,

50Hz,

100Hz,

200

Hz,

500Hz,

4kHz,

8kHz

and

10kHz

signals,

and

record

ув?

(L-CH)

|

these

signals

on

the

test

tape.

VRB

(R-CH)

0

lj

.

Playback

the

signals

recorded

in

step

5,

and

check

if

the

=

Ó

frequency

response

curve

is

within

the

limits

shown

in

the

overall

frequency

response

chart

for

normal

tapes

(fig.

10).

(If

the

curve

is

within

the

charted

specifications,

proceed

to

steps

7,

8

and

9.)

If

the

curve

is

not

within

the

charted

specifications,

adjust

p

ella

Утум.

pM

d

as

follows;

v

б

For

overal

frequency

VTVM

Oscilloscope

response

measurement

For

bias

voltage

measurement

Fig.

11

Adjustment

(A):

Adjustment

(B):

b

When

the

curve

exceeds

the

TD

When

the

curve

falis

below

overall

specified

frequency

:

Le

the

overall

specified

fre-

response

chart

(fig.

10)

as

Hi

quency

response

chart

(fig.

shown

in

fig.

12.

==

®

10)

as

shown

in

fig.

13.

1)

Increase

bias

current

by

=

р

|

1)

Reduce

bias

current

by

turning

VR7

(L-CH)

and

turning

VR7

(L-CH)

and

==

VR8

(R-CH).

7

УВВ

(R-CH).

а

ЕЗИ

(See

fig.

1

оп

page

6.)

pe

QUK

Repeat

steps

5

and

6

for

EE

WM

2)

Repeat

steps

5

and

6

for

SkHz

7kHz

8kHz

confirmation

(Proceed

to

6

kHz

7ана

ван:

confirmation

(Proceed

to

Fig.

12

steps

7,

8

and

9

if

the

Fig.

13

steps

7,

8

and

9

if

the

curve

is

now

within

the

|

;

curve

is

now

within

the

charted

specifications

(

charted

specifications

as

shown

fig.

10.)

as

shown

fig.

10.)

3)

If

the

curve

still

exceeds

the

specifications

(fig.

If

the

curve

still

falls

below

the

charted

specifica-

10),

increase

bias

current

further

and

repeat

tions

(fig.

10),

reduce

bias

current

further

and

steps

5

and

6.

repeat

steps

5

and

6.

7.

Place

UNIT

into

CrO,

tape

mode.

8.

Change

test

tape

to

CrO,

reference

blank

test

tape}

Overall

frequency

response

chart

(CrO,,

Metal)

(QZZCRX),

and

record

1kHz,

50Hz,

100Hz,

200Hz,

500Hz,

4kHz,

8kHz,

10kHz

and

12.5kHz

signals.

Then,

playback

the

signals

and

check

if

the

curve

is

within

the

limits

shown

in

the

overall

frequency

response

chart

for

CrO,

tapes

(fig.

14).

.

Place

UNIT

into

metal

tape

mode

and

change

test

tape

to

metal

reference

blank

test

tape

(QZZCRZ),

and

record

1kHz,

50Hz,

100

Hz,

200Hz,

500Hz,

4kHz,

8kHz,

10kHz

and

12.5kHz

signals.

Then,

playback

the

signals

and

check

if

the

curve

is

within

the

limits

shown

in

the

overall

frequency

response

chart

for

metal

tapes

(fig.

14).

.

Confirm

that

bias

voltage

are

approximately

as

follows

when

the

UNIT

is

set

at

different

tape

mode.

*

Measure

the

voltage

across

the

head

using

a

VTVM.

50H:

100H2

2008: 500Hz

]KHz

2кн2

ані

around

6.2V

(Normal

position)

Reference

value:

around

8.9V

(CrO,

position)

around

15.7V

(Metal

position)

i

|

RS-B14

|

©

Overall

gain

Condition:

Equipment:

е

Record/playback

mode

*

VTVM

*

AF

oscillator

*

Normal

tape

mode

*

ATT

*

Oscilloscope

*

Input

level

controls...

MAX

*

Resistor

(6009)

J

*

Standard

input

level;

*

Test

tape

МІС

...............

-72%3ав

(reference

blank

tape)

...

QZZCRA

for

Normal

.

Test

equipment

connection

is

shown

іп

fig.

15.

Record/playback

1

2.

Insert

the

normal

reference

blank

tape

(QZZCRA).

ғи

3.

Place

UNIT

into

record

mode.

а

Bx:

4.

Supply

а

1kHz

signal

through

ATT

(-24dB)

from

AF

oscillator,

to

LINE

RE

TT

TS

IN.

oscillator

(BEER

Record

mode

5.

Adjust

ATT

until

monitor

level

at

LINE

OUT

becomes

0.4V+1

dB.

Қайы

6.

Playback

recorded

tape,

and

make

sure

that

the

output

level

at

LINE

—

*"«/Patex

OUT

becomes

0.4V+1dB.

=]

|

7.

If

measured

value

is

not

0.4V+1dB,

adjust

it

by

using

VR5

(L-CH)

or

S

E|

>

i

VR6

(R-CH).

Playback

mode

—

VIVM

Oscilloscope

8.

Repeat

from

step

(2).

Test

tape

Fig.

15

Q

Fluorescent

meter

Condition:

Equipment:

*

Record

mode

e

VTVM

*

AF

oscillator

*

Input

level

controls...MAX

*

ATT

*

Oscilloscope

*

Resistor

(6009)

.

Make

connections

as

shown

(See

fig.

16).

.

In

the

recording

pause

mode,

apply

1kHz

(-24dB)

to

LINE

IN.

.

Adjust

АТТ

so

that

output

level

LNE

OUT

is

0.4V+1dB.

AF

oscilator

АТТ

мелу

Record

mode

УТУМ

—

Oscilloscope

.

At

this

time,

check

that

OdB

indicator

is

lighted

halfway

Fig.

16

(intermediate

brightness

between

full

brightness

and

light-

out:

See

fig.

17).

-:3

Г

ТОРЕК

10

+

$

3

4

(|

*

005

3]

+08

5.

It

the

indicator

is

not

lighted

halfway

as

described

in

step

4,

|

ТІЛЕДІ

£O

№

+

adjust

VR9

(L-CH),

VR10

(R-CH).

Шш

ШШШ

uibs

gx

6.

Repeat

adjustments

and

checks

at

steps

3,

4

and

5

two

or

three

times.

Fig.

17

ш

шшшшшшшшшш

Ф

Dolby

NR

circuit

Condition:

Equipment:

*

Record

mode

*

VTVM

*

AF

oscillator

*

Dolby

NR

switch...IN/OUT

*

ATT

*

Oscilloscope

*

Dolby

NR

select

*

Resistor

(6009)

switch...B/C

Balance

control...Center

*

input

level

controls...

MAX

Record

side

*

Check

of

the

Dolby-B

type

encoder

characteristics

.

Make

connections

as

shown

in

fig.

18.

.

Set

the

unit

to

the

record

mode.

(NR

select

switch

is

OUT.)

.

Apply

a

1kHz

signal

to

LINE

IN.

.

Adjust

the

ATT

so

that

the

output

level

at

TP3

(L-CH)

and

TP4

(R-CH)

is

12.3mV.

.

The

output

level

at

21

should

be

OdB.

.

Set

the

NR

select

switch

to

B,

and

make

sure

that

the

output

signal

level

at

21

of

IC5

(L-CH)

and

IC6

(R-CH)

is

+6dB+2.5dB.

.

Set

the

NR

select

switch

to

OUT,

and

adjust

the

frequency

to5kHz.

The

output

signal

level

at

21

should

be

OdB.

.

Set

the

NR

select

switch

to

B

and

make

sure

that

the

TP3

(L-CH)

output

signal

level

at

21

of

IC5

(L-CH)

and

IC6

(R-CH)

is

ТРА

(R-CH)

+

8dB+2.5dB.

*

Check

of

the

Dolby-C

type

encoder

characteristics

9.

Repeat

steps

1-5

above.

10.

Set

the

NR

select

switch

to

C

and

make

sure

that

the

output

signal

level

at

21

of

IC5

(L-CH)

and

IC6

(R-CH)

is

+

11.5dB«2.5dB.

AF

oscillator

ATT

"me

11.

Set

the

NR

select

switch

to

OUT

and

adjust

the

frequency

16

(R-CH)

VIE.

оваа

to

5kHz.

The

output

signal

at

21

should

be

OdB.

.

12.

Set

the

NR

select

switch

to

C

and

make

sure

that

the

Fig.

18

output

signal

level

at

21

of

IC5

(L-CH)

and

ІС6

(R-CH)

is

T

8.5dB+2.5dB.

со

ч

ость

©

ND

—

Ш

BLOCK

DIAGRAM

(L-CH

ONLY)

[Dolby

ON/OFF]

[Dolby

в

CNR

|

Line/Mic

Selector

53

59

NR

Dolby

52-1

52-3

LINE

ІМ

off

on

B

с

Q

о—

С)

Ом

О

Balance

Control

MIC

JACK

E

Лс

уг)

RECORD/

q

pay

V

C

PX

asa

PLAYBACK

HEAD^-

61-5

$

9

/

—!

м

;

=>

51-2

УЛ

е:

/

VRI

"^

РА

==

ce

his

к

хі

7

gain

adj.

7O

7

Y

/

)

/

E

e

Dolby

B:

CNR

01

QII

CrO2/Metal

ы

реу

Á

(^)

HALF/

ON

4

FF/REW/CUE

/REV

To

R-CH

TB

VR8

VR7

Bias

Current

adj.

9135

О

ERASE

HEAD

О

x

8

als

RECTIFIRE

REGULATOR

0000000000

Fr

N

Technics RS-B14 User manual

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