Technics SU-G50 User manual

Service

Manual

Stereo

Integrated

Amplifier

SPECIFICATIONS

(DIN

45

500)

m

AMPLIFIER

SECTION

40

Hz~20

kHz

continuous

power

output

both

channels

driven

2x85

W

(8Q)

DIN

power

output

2x

100

W

(8Q)

Total

harmonic

distortion

rated

power

at

40

Hz~20

kHz

0.09%

(8Q)

rated

power

at

1

kHz

0.05%

(8Q)

half

power

at

1

kHz

0.03%

(8Q)

Intermodulation.distortion

rated

power

at

50

Hz:

7

kHz=4:1,

SMPTE,

80

0.09%

Power

bandwidth

both

channels

driven,

—3 dB

10

Hz~20

kHz

(8Q,

THD

0.09%)

Residual

hum

and

noise

1mvV

Input

sensitivity

and

impedance

PHONO

2.5

mV/47

kQ

TUNER,

CD,

TAPE,

VCR

2/TV,

VCR

1/EQ

150

mV/47

kQO

PHONO

maximum

input

voltage

(1

kHz,

RMS)

128

mV

(135

mV,

IHF

’66)

S/N

rated

power

(80)

PHONO

71

dB

(IHF

66:

78

dB)

TUNER,

CD,

TAPE,

VCR

2/TV,

VCR

1/EQ

70

dB

(IHF

66:

90

dB)

Frequency

response

PHONO

RIAA

standard

curve

+0.8

dB

(30

Hz~

15

kHz)

TUNER,

CD,

TAPE,

VCR

2/TV,

VCR

1/EQ

10

Hz~80

kHz

(+0,

—3

dB)

Technics

Matsushita

Electric

Industrial

Co.,

Ltd.

Central

P.O.

Box

288,

Osaka

530-91,

Japan

ORDER

NO.

AD9006159C7

Amplifier

SU-G50

Color

(K)

in

ccsnecas

Black

Type

Area

Asia,

Latin

America,

(GC)

Middle

Near

East

and

Africa

Oceania

Far

East-PX

(K)

Tone

controls

BASS

50

Hz,

+10

dB~—10

dB

TREBLE

20

kHz,

+10

dB~—10dB

Super

bass

80

Hz,

+6

dB

Muting

—20

dB

Output

voltage

TAPE,

VCR

1/EQ

REC

OUT

150

mV

Channel

balance,

CD

250

Hz~6,300

Hz

+1dB

Channel

separation,

CD,

1

kHz

50

dB

Headphones

output

level

and

impedance

670

mV/3300.

Load

impedance

AorB

80~160Q

AandB

80~160

m@

GENERAL

Power

consumption

510

W

Power

supply

For

Oceania:

AC

50

Hz/60

Hz,

240

V

For

others:

AC

50

Hz/60

Hz,

110

V/127

V/220

V/240

V

Dimensions

(WxHxD)

430

x

130.5x310

mm

(161%/6"x5%e"x

1272")

Weight

7.6

kg

(16.7

Ib.)

Notes:

1.

Specifications

are

subject

to

change

without

notice.

2.

Weight

and

dimensions

are

approximate.

3.

Total

harmonic

distortion

is

measured

by

the

digital

spectrum

analyzer.

Panasonic

Tokyo

Sales

Department

Matsushita

Electric

Industrial

Co.,

Ltd.

World

Trade

Center

Bldg.,

4-1,

Hamamatsu-cho,

2-chome,

Minato-ku,

Tokyo

405,

Japan

SU-G50

m@

CONTENTS

Page

BEFORE

REPAIR:

ici

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cece

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SCHEMATIC

DIAGRAM

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13~18

PROTECTION

CIRCUITRY

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PRINTED

CIRCUIT

BOARDS

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19~22

ACCESSORIES

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tence

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enes

2

TERMINAL

GUIDE

OF

IC’S,

LOCATION

OF

CONTROLS

...........

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3,4

TRANSISTORS

AND

DIODES

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CONNECTIONS

220...

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4~6

WIRING

CONNECTION

DIAGRAM

............-2.-0

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23

DISASSEMBLY

INSTRUCTIONS

................0000.0

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7~9

REPLACEMENT

PARTS

LIST

...........-00000

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24~28

DESCRIPTION

OF

FLPANEL

...............0c

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29,

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DIAGRAM

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teenies

11,12

m@

BEFORE

REPAIR

(1)

Turn

off

the

power

supply.

Using

a

10,

5

W

resistor

connect

both

ends

of

power

supply

capacitors

(C701,

C702,

10000

LF)

in

order

to

discharge

the

voltage.

(2)

Before

turning

the

power

supply

on,

after

completion

of

repair,

slowly

apply

the

primary

voltage

by

using

a

power

supply

voltage

controller

to

make

sure

that

the

consumed

current

at

50

Hz/60

Hz

in

NO

SIGNAL

mode

should

be

shown

below

with

respect

to

supply

voltage

110

V/127 V/220

V/240

V.

Power

supply

voltage

AC

110

V

AC

127V

AC

220

V

AC

240

V

Consumed

current

50

Hz

260~510

mA

300~550

mA

100~400

mA

80~330

mA

Consumed

current

60

Hz

208~408

mA

240~440

mA

80~320

mA

64~264

mA

m

PROTECTION

CIRCUITRY

The

protection

circuitry

may

have

operated

if

either

of

the

following

conditions

is

noticed:

*No

sound

is

heard

when

the

power

is

switched

ON.

*Sound

stops

during

a

performance.

The

function

of

this

circuitry

is

to

prevent

circuitry

damage

if,

for

example,

the

positive

and

negative

speaker

connection

wires

are

“shorted”,

or

if

speaker

systems

with

an

impedance

less

than

the

indicated

rated

impedance

of

this

unit

are

used.

If

this

occurs,

follow

the

procedure

outlined

below:

1.

Switch

OFF

the

power.

2.

Determine

the

cause

of

the

problem

and

correct

it.

3.

Switch

ON

the

power

once

again.

Note:

When

the

protection

circuitry

functions,

the

unit

will

not

operate

unless

the

power

is

first

switched

OFF

and

then

ON

again.

m@

ACCESSORIES

¢

AC

power

supply

cord

(SJA173)...For

(GN)

area

only.

(RJA0004)...For

others.

@AC

attachment

plug

(SJP9215)...For

(GC),

(PX)

areas.

Configuration

of

AC

power

supply

cord

differs

according

to area.

ey

ees

nC

ee

Oe

ee

ae

mm

LOCATION

OF

CONTROLS

Front

panel

SU-G50

[1]

Power

switch

(power)

[2]

Peak-power

indicators

(power

level)

These

indicators

indicate

the

peak

power

value

of

the

output

level

to

the

speaker

systems.

[3]

Input

selector/volume

level

display

(input)

This

display

usually

shows

the

sound

source

selected

by

the

input

selectors;

when

the

volume-control

is

used

to

adjust

the

volume

level,

the

level

is

displayed

in

decibel

for

about

two

seconds,

after

which

the

display

returns

again

to

indica-

tion

of

the

sound

source.

[4]

Muting

indicator

({mute|

)

This

indicator

will

illuminate

when

the

muting

button

on

the

remote-control

transmitter

(not

included)

is

pressed.

(Refer

to

the

operating

instructions

of

the

component

with

which

the

remote-control

unit

is

included.)

To

cancel

the

muting

function

without

using

the

remote-con-

trol

transmitter,

press

and

hold

the

‘‘phono”

input

selector

of

this

unit

for

about

4

seconds.

Note:

The

unit

will

switch

to

the

phono

mode.

[5]

Volume

indicator

(volume

level)

Indicates

the

volume

output

level

at

a

glance.

Super

bass

switch/indicator

(super

bass)

Low

frequency

sounds

are

reinforced

when

this

switch

is

pressed.

The

indicator

will

illuminate.

Volume

control

(volume)

Input

selectors/indicators

(input

selector)

These

selectors

are

used

to

select

the

sound

source

to

be

heard,

such

as

a

disc,

radio

broadcasts,

etc.

The

correspon-

ding

input

selector

indicator

illuminates

during

operation

to

indicate

the

selected

sound

source.

The

selected

sound

source

is

also

displayed

on

the

input

selector/volume

level

display.

[9]

Balance

control

(balance)

This

control

is

used

to

adjust

the

left/right

volume

balance.

VCR

1-monitor

switch/indicator

(monitor)

Set

this

switch

to

the

ON

position

(so

that

the

indicator

above

is

illuminated)

when

using

a

graphic

equalizer

o,

playing

back

or

monitoring

the

sound

from

a

VCR

connecied

to

the

“VCR

1/EQ”

terminals.

This

selector

should

be

set

to

the

OFF

position

(indicator

off)

at

all

other

times.

[14]

Tone

controls

(bass/treble)

The

bass

control

is

used

to

adjust

the

low-frequency

sound

range,

and

the

treble

control

is

used

to

adjust

tihe

high-

frequency

sound

range.

[12]

Speaker

selectors

(speakers)

These

selectors

are

used

to

turn

the

speaker

system

S

on

and

off.

[13]

Headphones

jack

(phones)

SU-G50

eRear

panel

COOLING

FAN

AC

OUTLETS

For

(GC)

(PX)

areas

i)

fl

[@D|—_+ae

INLET

G—jpvourace

SELECTOR

For

(GC)

(PX)

areas

AC

OUTLET

For

(GC)

(PX)

areas

SPEAKER

A

SPEAKER

B

TO

TAPE

TO

TUNE

R

|

REMOTE

CONTROL

Phono

input

capacitance

is

about

100

pF.

m@

CONNECTIONS

Make

connections

to

each

component

in

the

system

by

using

stereo

connection

cables

(not

included).

A|

[GND]

|B}

{C

D|

[REMOTE

CONTROL

(TUNER)|

[REMOTE

CONTROL

(TAPE)

EME

“PHONO”

terminals

Connect

a

turntable.

Connect

a

compact

disc

player.

a

L

©)

©

Compact

disc

player

?

(not

inc

tuded)

Turntable

(not

included)

R

©)

a

ED

©)

LINE

OUT

ii

®

v

A

W

==

®

wo

AR)

GND)

terminal

This

terminal

is

for

use

with

a

turntable

which

has

a

ground

wire.

FOR

oe

EE

a

Fe

ears

[c]

“TAPE”

terminals

Connect

a

tape

deck.

7

TAPE

REC

QUT

PLAYBACK

Cassette

deck

(not

included)

LINE

IN

LINE

OUT

@i

|

REMOTE

CONTROL

(TAPE)

terminal

This

terminal!

is

used

to

connect

a

Technics

tape

deck

with

the

control

terminal.

rey

“vcr

2/TV”

terminals

Connect

a

second

video

cassette

recorder

or

TV.

©

|

VCR

(not

included)

(R)

0

®

[F

|

“VCR

1/EQ”

terminals

Connect

a

video

cassette

recorder

or

a

graphic

equalizer.

—VORI/EQ—,

Graphic

equalizer

(not

included)

©

LINEIN

O

©

LINE

OUT

“TUNER”

terminals

Connect

a

tuner.

[o]

(not

included)

cb

REMOTE

CONTROL

®

¢

—_®

©

Wi

[REMOTE

CONTROL

(TUNER)

terminal

This

terminal

is

used

to

connect

a

Technics

tuner

with

the

control

terminal.

Connect

the

L-type

cable

(included).

[ele

“PRE

OUT/MAIN

IN”

terminals

Do

not

remove

the

shorting

pins

from

these

terminals

unless

you

plan

to

use

an

independent

preamplifier

or

main

amplifier.

(No

sound

will

be

heard

if

they

are

removed).

To

use

it

in

this

way,

consult

the

operating

instructions

for

the

additional

amplifier

or

preamplifier

that

you

plan

to

use.

io)

2

Q&S

[H|

Cooling

fan

The

cooling

fan

operates

at

high

output

power

levels

only.

|AC

OUTLETS||~AC

IN

SPEAKERS

(See

text

at

right.)

“AC

OUTLETS”

(UNSWITCHED)

Power

is

always

available,

regardless

of

power

switch.

Audio

equipment

rated

up

to

60

W

(total

for

all

outlets)

can

be

connected

here.

For

(GC),

(PX)

areas.

AC

power

supply

cord

Connect

the

AC

power

supply

cord

(included)

after

all

other

cables

and

cords

are

connected.

Tuner

(not

included)

AC

power

supply

cord

(included)

If

this

unit

is

not

to

be

con-

nected

with

the

tuner

This

unit

Househoid

AC

outlet

SU-G50

Connection

to

speaker

systems

Two

pairs

of

speaker

systems

(main,

second)

can

be

connected

to

this

unit.

Speaker

systems

that

can

be

connected

(to

any

of

the

speaker

connection

terminals

of

this

unit)

are

speaker

systems

with

an

impedance

of

8

to

16

ohms.

Main

speaker

systems

(not

included)

Connect

to

the

“A”

terminals.

(left)

Second

speaker

systems

(not

included)

Connect

to

the

‘‘B”

terminals.

(right)

(left)

To

connect

cords

to

terminals

@

Strip

off

the

outer

@D

covering,

and

twist

the

——s=

>

=

center

conductor.

15mm

Twist

(19/32”’)

@

Tilt

the

lever

back

and

insert

the

cord.

@

P=

Vel

@)

Close

the

lever

and

pull

the

cord

gently

to

be

sure

that

it

is

secure.

ANS

Note:

Be

sure

to

only

connect

positive

(+)

cords

tcpo

sitive

(+)

terminals,

and

negative

(—)

cords

to

negative

¢

—)

terminals.

Note:

To

prevent

damage

to

circuitry,

never

short-circuit

the

plus

(+)

and

minus

(—)

speaker

cords.

m@

DISASSEMBLY

INSTRUCTIONS

“ATTENTION

SERVICER”

Some

chassis

components

may

have

sharp

edges.

Be

careful

when

disassembling

and

servicing.

eae

Removal

of

the

Cabinet

Procedure

1

2)

Cabinet

lo

Front

Panel

1.

Remove

the

2

flat

cables

(CN601,

CN602).

2.

Remove

the

3

screws

(Q@~®).

3.

Remove

the

front

panel

in

the

direction

of

the

arrow.

Remove

the

6

screws

(Q@~@).

Removal

of

the

Power

Switch/

Speakers/Headphones

P.C.B.

Procedure

1-2-3

Power

Switch

/Speakers

/Headphones

P.C.B.

Front

Panel

How

to

remove

the

flat

cable

1.

Lift

the

connector.

2.

Pull

out

the

flat

cable.

Flat

cable

a

|

Connector

OZ

a

Ref.

No.

4

Procedure

152-54

@

Volume/FL

P.C.B.

1.

Pull

out

the

1

knob

(@).

2.

Remove

the

1

nut

(@).

3.

Remove

the

5

screws

(Q@~@).

@

Operation

P.C.B.

1.

Pullout

the

3

knobs

(@~@®).

2.

Remove

the

10

screws

(@~@).

a

Check

of

the

main

P.C.B.

Procedure

15

3.

Remove

the

3

screws

(O~@®).

4.

Remove

the

front

panel

in

the

direction

of

the

arrow.

Ref.

No.

6

Procedure

1-5-6

Regulator

Transistor

1.

Unsolder

the

power

IC

or

regulator

transistor.

2.

Remove

the

4

screws

(@~Q).

When

mounting

the

power

IC

or

regulator

transistor.

Apply

silicone

compond

(SZZOL15)

to

the

rear

side

of

power

IC

or

regulator

transistor.

Bottom

Chassis

5.

Remove

the

bottom

chassis

in

the

direction

of

the

arrow.

6.

Reinstall

the

front

panel

to

the

main

P.C.B.

eee

Removal

of

the

Power

Transformer

Procedure

17

Power

Transformer

1.

Remove

the

flat

cable

(CN701).

2.

Remove

the

4

screws

(@~@).

fe

ee

eee

tae

Ref.

No.

Removal

of

the

Rear

Panel

Ref.

No.

Removal

of

the

AC

Outlet/AC

Iniet

8

9

P.C.B.

Procedure

138

1-8-9

Rear

panel

1.

Remove

the

connector

(CN651).

2.

Remove

the

13

screws

(Q@~®).

3.

Remove

the

rear

panel

in

the

direction

of

the

arrow.

e

Release

the

8

claws.

Procedure

1-810

.

Release

the

3

claws.

(See

Fig.

1)

2.

Insert

a

screwdriver

at

the

root

of

the

cooling

fan.

Force

it

out

of

the

motor

shaft.

(See

Fig.

2)

3.

Remove

the

motor

cover

by

used

©

screwdriver.

(See

Fig.

3)

4.

Remove

the

motor

from

the

fan

casing.

(See

Fig.

4)

5.

When

mounting

the

motor

fan,

align

the

fan

casing’s

projection

with

the

hole

of

the fan

motor.

(See

Fig.

5)

Fan

case

Cooling

fan

Projection

(Fig.

2)

Fan

motor

(Fig.

5)

m@

DESCRIPTION

OF

FL

PANEL

[FL901

(RSL0044-F))

eGRID

ASSIGNMENT

7G

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CONNECTION

Pane

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F/FININ|

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NO.

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Components

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Technics SU-G50 User manual

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