Technics SH-8075 Bedienungsanleitung

Dieses Handbuch passt für folgende Modelle

5

Andere Technics Stereo-Equalizer Handbücher

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|

\*

i

The

Bleek.

type

model

is

‘indicated

by

(K)

in

the

Service

Manual.

The

colors

of

this

model

|

1S

black

type

only.

"Naseperoctumsateleotinmnctoaity

cman

a

peta

in

ss

He

aces

Specifications

(DIN

45

500)

Frequency

response

(center

position)

Maximum

output

voltage

Rated

output

voltage

Rated

total

harmonic

distortion

Input

sensitivity

Signal-to-noise

ratio

Maximum

input

voltage

input

impedance

Output

impedance

Gain

Channel

balance

250

Hz~6300

Hz

Channel

separation

1

kHz

Band

level

controis

>5

HZ~100

kHz,

—1

dB

>8V

(1

kHz,

THD

0.01%)

(LOW

LEVEL

150

mV)

ames

>

0.001%

(20

Hz~20

kHz)

a

110

dB

(120

dB,

IHF

‘A)/2

V

104

dB

(114

dB,

IHF

’A)/1

V

8

V

(1

kHz)

(LOW

LEVEL

150

mv)

>

47

kQ

>

600Q

>O0+1dB

=+0:506

:70dB

+12dB~-12dB

Stereo

Graphic

Equalizer

Specifications

are

subject

to

change

without

notice

for

further

improvement.

Weights

and

dimensions

shown

are

approximate.

Center

frequency

ORDER

NO.

SD83072619C2

Areas

|,

[EH],

[EB],

*

EK]

is

cAvailieal

in

United

Kingdo

*

[EF]

is

available

in

France.

*{EH]

is

available

in

Holland.

*

(EB)

is

available

in

Belgium.

x

[EGA]

iS

available

in

F,

R.

Germ

an

a

TOA

202.

25

AZ

OV

oases

40

Hz,

50

Hz,

63-H2,:80:

Hz,

100:HZ,.125

Hz,

160

Hz,

200

Hz,

250

Hz.375-Hz,

400

Hz,.500

Hz,

630

Hz,

800

Hz,

1

KHz,

1.25

kHz,

16

KHz,

2

kHz;

2.5

KHZ,

3.15

kHz,

4

kHz,

5

KHz,

6.3

KHz,

8

KHz,

10

kHz,

12.5

KHz,

16

KHz,

20

kHz,

25

KHz

Variable

equalizer

Center-frequency

controls

(variable)

>

20

Hz~

400

Hz

Bandwidth

controls(Q)

:0.7~7

Band

level

controls

hie

dB]

1208

GENERAL

Power

supply

>

AC

110

V/120

V/220

V/240

V,

50

Hz/60

Hz

Power

consumption

>

34

W

Dimensions

(33

elements

continuously

variable

per

channel)

Signal

level

selector

7150

mV/1

V

&

CONTENTS

Page

SAFETY:PRECAUTION

2p

pei

ee

ERE

Baws

Seem

2

TOTAL

FREQUENCY

RESPONSE

ii

Bi

ity

Seah

Gas

Hes

hae

Cie

SO

aera

ean

LOCATION

OF

CONTROLS

.

Sk

WR

ote

lelctan

Woe

a

Ae

Ge

DISASSEMBLY

INSTRUCTIONS

.

;

fay

8k

ena

a

Oe

MODEL

NO.

SH-8065

BE

DIFFERENT

MODEL

NO.

SH-8075

:

:

ews:

&.

pay

“6

PRINTED

CIRCUIT

BOARDS

WIRING.

CONNECTION

DIAGRAM

i

a

iat

Bye

‘Technics

(HxWxD)

>

153x430

x

330

mm

(6-1/32"

«

16-15/16"

x

13")

Weight

:

6.6

kg

(14.5

Ib)

Page

PRINTED

CIRCUIT

BOARDS

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

9°16

TECHNICAL

INFORMATION

.

ee

ee

ee

eee

|

EXPLODED

VIEW.......

le

18,19

REPLACEMENT

PARTS

LIST

.

Bi

eae

ole

ee

ea

ee

SCHEMATIC

DIAGRAM

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

000-5.

21~30

BLOCK

DIAGRAM

.....

Say

&

bre

&

i

oe

SG

eee

RESISTORS

AND

CAPACTIORS

Pg

yk

he

BB

eA

Hata

ie,

Op

OA

Matsushita

Electric

Trading

Co.,

Ltd.

P.O.

Box

288,

Central

Osaka

Japan

B

SAFETY

PRECAUTION

mf

WN

-

Wh

-

©

_

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.

.

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.

INSULATION

RESISTANCE

TEST

.

Unptug

the

power

cord

and

short

the

two

prongs

of

the

plug

with

a

jumper

wire.

|

.

Turn

on

the

power

switch.

.

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

3M22

and

5.2MQ

to

all

exposed

parts.

(Fig.

A)

Equipment

without

antenna

terminals

meule

read

approximately

infinity

to

all

exposed

parts.

(Fig.

B}.

Note:

Some

exposed

parts

may

be

isolated

from

the

chassis

by

design.

These

will

read

infinity:

Antenna

terminal

Exposed

metal

part

Ohmmeter

Ohmmeter’

(Fig.

A)

(Fig.

B)

Resistance

=

3M2

~

5.2M@Q

Resistance

=

Approx

OO

.

1f

the

measurement

is

outside

“he

specified

‘limits:

there

is

a

possibility

of

a

shock

hazard

The

equipment

should

be

saps

and

rechecked

before

it

is

returned

to

the

customer.

heed

@

TOTAL

FREQUENCY

RESPONSE

Frequency

response

(+12dB

position}

+12

poeta

ee

ee

ee

alee

die

2th

+10

PAAR

RAO

TAA

UTA

AA

wa

<p

PANINI

LIE

tee

oe

CONES

An

44

Ht

AAR

A

AAU

A

A

“4215

LL

A

AX

MARA

SAX

ee

Nrenuniel

0

ee

SSS

2

RAAT

OP

I

I

IO

ODI

AY

ALLA

—

4

DANO

MAK

KY

MY

TY

IXY

YI

TY

XIX

KAY

XX

AL

VARY

YY

yYVV

VV

YY

Vi

3

vuUW

Uh

ed

ori

a

SOFA

TA

A

TA

WUT

LT

A

“10

23.

§

7100

2.3

§

71%

23

5710k

23

§

Frequency

(H2)

Level

a

SH-8075

@

LOCATION

OF

CONTROLS

Power

switch

©

Band

ievel

control

Equalizer

on/of*

switch

|

B

oft,

=

on}

Recording

mode

switch

{

Mf

straight,

=

EQ)

tape

7

tase

2

@

Sand

level

contro!

@

Bandwidth

{Q)

control

©

Variable

equalizer

switch:

Lch.

{

EE

off,

=

on)

@

Bandwidth

(Q)

contral

Band

jevel

controls

:

L

ch,

+12d8

@

Frequency

control

{Hz)

Band

level

controls

:

R

ch.

+12dB

@

Frequency

control

(Hz)

@

Variable

equalizer

switch

:

Rich.

(

M

off,

=

on)

input

selector

input

signal

level

saleetec

@

VARIABLE

EQUALIZER

os

“Technica:

Information”

on

page

17

also

describes

me)

variable

equalizer.

The

variable

2qualizer

can

be

used

for

corrections

of

low-frequenc.

characteristics.

The

functions

in

this

unit

are

as

follows:

@

Center

frequency

contro!

knob

(frequency,

Hz)

is

able

to

cantinuously

vary

the

frequency

in

a

range

Of

20Hz

~

400Hz

to

set

it

to

the

desired

point.

@

Band

width

knob

fhandwidth.

O)

ie

able

to

conti-

hudusly

.aty

the

resonance

peak

{Q)

of

frequency

set

by

knob

6

@_

in

a

range

of

0.7~7.

Turning

it

counters

7ckwise

decreases

the

value

of

Q,

making

H

9a

te

ri

a

a

an

an

Ahn

Sie

ma

To

©

iets

A

hab

fs

dee

rh

MN

wate

on

LINE

IN

!

——PLAYBACK

=

:

ae

Dba

eh

I

To

Tape

deck

2

Pa

REC

OUT

el

cae

sn

4

PLAYBACK—————y

=

-

Low

level

~

150m

V

side

{Input

from

“REC

OUT"

of

amplifier:

Output

to

“"PLAYBACK"’)

High

level

>

1V

side

(Input

from

“PRE

OUT"

of

amplifier

:

Output

to“MAIN

IN’)

Voltage

setector

(110V/120V/220V/240V)

=

To

Tape

deck

1

the

peak

and

dip

gentle,

while

turning

it

clockwise

increases

the

value

of

Q,

making

the

peak

and

dip

sharp,

resulting

in

less

interference

given

by

or

to

adjacent

channels.

©)

Variable

equatizer

band

level

control

is

able

to

vary

the

frequency

set

by

knob

@

by

+12

dB.

If

the

frequency

set

by

knob

@

is

63

Hz,

then

it

can

be

varied

+24

dB

by

using

the

knob

@

and

the

22-division

GB

Hz

band

terel

conirel

Kage.

4)

Variable

equalizer

switch

(variable

£Q)

is

a

switch

to

turn

on/off

the

control

knobs

@

~

@.

(16H2~25kHz,

divided

into

33

band

in

1/3

octave.)

(16Hz~25kHz,

divided

into

33

band

in

1/3

octave.)

ook

Sa

S29

@®

OTHER

SWITCHES

*

Equalizer

on/off

switch

(EQ)

This

switch

is

used

to

turn

on/off

the

equalizer

circuit.

With

it

set

to

“on”,

the

frequency

characteristic

can

be

varied

by

the

upper

and

lower

band

level

controls

(33

sets

each)

and

the

variable

equalizer

band

level

controls

(1

set

gach)...

hy

Bas

*

With

Jit:

‘set,

to,

"off

“a

signal

is.

‘obtained

not

to

make

%

“off,

the

signal

comes

out

through

the

unit.

*

Record

mode

switch

(rec

mode)

When

recording

on

a

tape

deck,

correction

mode

is

selected

by

this

switch.

“EQ”

is

the

position

for

recording

with

correction

given,

@

DISASSEMBLY

INSTRUCTIONS

@

How

to

remove

the

bottom

board

.

Remove

the

8

setscrews

{red)

as

in

[Fig.

1]

to

reomve

the

bottom

board.

*Remove

the

bottom

board

from

andenesih

the

front

pane!

as

shown

by

the

arrows.

a

Red

‘<

(8

pes)

pte

oi

Input

selectar

switch

:

1

ie,

“Source”

is

the

position

“for

record

say:

and

radio

‘broadcast.

%

2

>

#

,

“equalizer

cotrection.4

flan

a7

*

Even

when

power

switch

is

off

with

this

switch

turned

yee

lf

the

equalizer

on/off

switch

is

set

to

“off’’,

the

“straight”

indicator

lights

up

and

signal

without

correc-

tion

will

be

recorded.

“Straight”

is

the

position

for

recording

without

correc-

tion

sae

“tape

1”

is

the

position

for

playback

on

a

tape

deck

connected

to

“TAPE

1°

terminal

on

the

rear

chassis

or

for

dubbing

from

tape

deck

1

to

2.

“tape

2”

is

the

position

for

playback

on

tape

deck

2

or

for

dubbing

from

tape

deck

2

to

1.

How

to

remove

the

front

panel

1.

Remove

the

setscrews

@

~

@

[Fig.

2]

to

remove

the

cabinet.

2.

Remove

the

5

setscrews

[Fig.

2]

of

the

front

panel.

3.

Pull

out

the

6-pin

connector

{terminals

@

~

@]

from

the

switch

P.C.B.

on

the

left

side.

[Fig.

3]

4.

Remove

the

front

panel

with

care

not

to

scratch

the

knobs.

Power

switch

and

bottom

connecting

rod

Pull

out

the

connector

before

removing

the

front

panel.

Front

panet

~—

Panel

setscrews

(5

pes)

Fig.

2

®

How

to

remove

the

band

level

controj

P.C.B.

if

2:

3;

Remove

the

front

panel.

Remove

the

band

level

contro!

knob.

(The

light

guide

plate

is

removed

with

it.)

Remove

the

light

shielding

cloth.

[Fig.

4]

_

Remove

the

9

setscrews

which

secure

the

R

or

L

channel

P.C.B.

[Fig.

5}

.

Remove

the

band

level

control

P.C.B.

*Each

control

LED

is

inserted

into

the

volume

lever

with

longer

pin

side

down.

Setscrews

af

switch

P.C.B.

(4

pes.)

P.C.B.

of

teft

ch.

band

level

contro!s

Light

guide

plate

Knob

\

epe

Light

guide

plate

Knob

2

insert

with

long

leg

down,

Ss

Setscrews

of

rith

ch.

band

fevei

control

P.C.B.

{9

pes.)

Fig.

5

@

How

to

remove

the

switch

P.C.B.

and

variable

equalizer

P.C.B.

1.

Remove

the

front

panel.

2.

Remove

the

4

setscrews

of

switch

P.C.B.

[Fig.

5].

3.

Pull

out

the

switch

P.C.B.

fixing

pin

[Fig.

8].

4.

Remove

the

6-pin

[terminals

(43)

~

(48)

]

and

7-pin

[terminals

(37)

~

(42)

]

connectors

from

the

variable

equalizer

P.C.B.

and

then

remove

the

switch

P.C.B.

as

in

Fig.

6.

5.

Check

the

P.C.B.

as

shown

in

Fig.

7.

Variable

equalizer

P.C.B.

Switch

P.C.B.

connector

6-pin

;

~

as

jy

7-pin

connector

SS

ACH

L

ua

TRRD

Woy

ass

ay

Power

supply

circuit

After

repair,

keep

the

lead

wire

away

from

the

power

supply

circuit.

Fig.

8

s

F

After

repair

a

Button

of

power

Push

switch

buttons

Level

control

knobs

1.

Make

the

wiring

away

from

the

power

supply

switch

knob

bight

guide

circuit

as

in

Fig.

8.

plat

2.

Be

sure

to

fit

each

button

and

switch

in

correct

positions.

[Fig.

9]

.

3

.

Side

down

Side

down

Gate

hole

side

of

malding

;

should

be

down.

Fig.

9

m@

MODEL

NO.

SH-8065

BE

DIFFERENT

MODEL

NO.

SH-8075

Center

frequency

33

elements

(16

Hz

~

25

kHz,

1/3

octave}

Right

and

(No,

of

BPF

elements}

left,

independent

of

each

other.

Recording

selector

|

“EQ

position’

switch

“rec

mode”

switch

source

tape

1

(dubbing

from

tape

1

to

2}

tape

2

(dubbing

fron

tape

2

to

1)

source

tape

{Playback}

Input

selector

ot

Positive/negative

characteristic

Characteristic

can

be

selected

Not

poss:

bie

selection

with

the

switch.

(Selecting

switch

is

not

provided.}

Variable

range

selector

+12

dB/+3

dB

can

be

selected

Not

possible

(+12

dB

only)

(*)

Variable

equalizer

selector

Possible

{*}

Band

width

control

(Q)

Possible

:

(0.7

~

7

continuously

variable)

(*)

Center

frequency

control

of.

©

Possible

“]

band

level

control

(*)

SH-8075

is

provided

with

variable

equalizer

circuit

so

that

the

center

frequency

(20

Hz

~

400

Hz)

end

its

band

width

other

than

the

other

band

levels

can

be

varied

by

variable

EQ

switch.

‘None

(6)

SH-8075

SH-8075

™@

PRINTED

CIRCUIT

BOARDS

WIRING

CONNECTION

DIAGRAM

Orange

AC

110/420/220/240V

[sigwat

Lever

_](se)

a

>

LOW

LEVEL

==

HIGH

LEVEL

~~

-

:

=

TAPE

2-7

p

TAPE

i

4

“~

AMP

i

ue

os

PLAYBACK

=

RECOUT

PLAYBACK

RECOUT

LINEOUT

LINEIN,

:

oe

+s

f

(58-1)

{

aan

ee

’

a

eee

A

08

018

~-IS

aes

=

.

VOLTAGE

749

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SELECTOR

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($1001)

0)

Input/Output

terminal,

power

supply

lt

ra

thy

aa

ane

Yellow

and

band

pass

filters

ao

(T1001)

Red]

Power

transformer

(Bottom

view

Se

ae

|

|

|

Band

level

control

of

variable

equalizer

S~o

o~%

|

P.C.B.

(Top

view)

.

Input/Output

controls

t

—

:

’

25

P.C.B.

(Top

view)

zs

7

7

Variable

equalizer

é

level

controls

(R

ch.)

che

P.C.8.

{Bottom

view)

VARIABLE

Indicators

EQ

(Q)

(Me)

EQ

«1

@)

(He)

I

Lery

——!

—

Rignt

——

SH-8075

H

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CIRCUIT

BOARDS

[ej

P.C.B.

(INDICATORS)

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terminal

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terminal

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:

Font

—

PLAYBACK)

Tp

(tepef

REC

OUT)

A

To

inverter

of

BPF.

|

SiG

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LEVEL

|

SH-8075

SH-8075

P.C.B.

(BAND

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TEREQUENCY

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me

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Pe

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20~400HzZ

BAND

LEVEL

SH-8075

@

TECHNICAL

INFORMATION

@

Variable

equalizer

circuit

(for

varying

the

center

frequency

and

band

width)

Integrator

Integrator

|

Adder/Subtractor

The

band

pass

filter

of

this

unit

is

designed

so

that

the

resonance

peak

characteristic

(band

width:

Q)

is

constant

at

5.

With

the

variable

equalizer

switch

set

at

“on”,

the

center

frequency

and

resonance

peak

characteristic,

only

for

20

Hz

~

400

Hz,

and

the

frequency

band

level

as

well

as

the

other

band

level

can

be

varied.

-

Fig.

1

is

a

variable

equalizer

circuit

consisting

of

3

operation

amplifiers

(1

adder/subtractor

and

2

integrators).

The

center

frequency

(fo)

of

band

pass

*

Band

ievel

is

at

+12

dB.

filter

is

determined

by

the

time

constant

of

R

and

C,

:

e

pay

ee

A

and

the

frequency

is

varied

by

double-acting

volume

poodle!

preauency

(fo)

Bandwidth

(Q)

varies

by

r.

R.

The

resonance

peak

characteristic

is

varied

by

:

double-acting

volume

r.

.

Fig.

1

©

Band

level

control

circuit

|

(for

varying

the

center

frequen):

by

#12

dB)

abe

Loe

eae

ss

*

¥

Fig.

2

is

a

circuit

that

‘ibs

the

frequency

charac:

eee

teristic

of

peak

anddip.

a

When

the

band

level

control

volume.

is

at

middle

position

@,

BPF

is

off

the

circuit,

therefore

the

input/output

gain

(G)

is

as

follows:

As

VR

is

shifted

t

to

0

®.

i

input

Gon

R3

and

output

of

(ore

cer

BPF

are

added

as

the

output

to

give

the

following:

.

or

a

Shifted

from

@—-@

R.,

_

(Peak

characteristic)

(=7+4

aT)

G=

Band

leval

control.

Tg

:

gain

characteristic

of

BPF

As

VR

is

shifted

to

©,

synthesized

NFB

of

BPF

and

Fig.

2

R2

is

given,

thereby

making

a

frequency

characteris-

tic

having

a

dip.

Response

of

bandwidth

contro!

(Q)

Definition

ne

|

|

|

INN

|

oN

ZING

“NA

.

“nq

expresses

the

sharpness

of

~

the

peak

and

the

dip,

and

its

value

is

expressed

as

the

value

Steere!

a

ary

obtained”

“when”

the’

“center

9

aOR

Se

sete:

frequency

(fo)

is

decreased

by

3

06

less

than

the

peak

point

(the

dip

point

is

increased

by

3

dB),

and

is

divided

by

the

frequency

range(Af

=

f,

—

f,).

fo

:

Af