Technics ST-K50 Manuel utilisateur

ORDER

NO.

AD9006162C7

Service

Manual

CYUARTZ

Synthesizer

AM/FM

Stereo

Tuner

SPECIFICATIONS

(DIN

45

500)

W@FM

TUNER

SECTION

Frequency

range

87.50

~

108.00

MHz

(0.05

MHz

steps)

Sensitivity

1.5

pV

(IHF,

usable)

SIN

30

dB

1.3

pV

(75

Q)

SIN

26

dB

1.2

pV

(75

Q)

SIN

20

dB

0.9

pV

(75

Q)

IHF

46

dB

stereo

quieting

sensitivity

28

wV/75

QO

Total

harmonic

distortion

MONO

0.15%

STEREO

0.3

%

SIN

‘

MONO

70

dB

(78

dB,

IHF)

STEREO

65

dB

(70

dB,

IHF)

Frequency

response

20

Hz~15

kHz,

+0.5

dB~—1.5

dB

Alternate

channel

selectivity

+400

kHz

55

dB

Capture

ratio

1.0

dB

Image

rejection

at

98

MHz

45

dB

IF

rejection

at

98

MHz

90

dB

Spurious

response

rejection

at

98

MHz

75

dB

AN

suppression

50

dB

Stereo

separation

1kHz

40

dB

10

kHz

30

dB

Carrier

leak

19

kHz

—

30

dB

(—35

dB,

IHF)

38

kHz

—45

dB

(—50

dB,

IHF)

Channel

balance

(250

Hz~

6,300

Hz)

+1.5

dB

Limiting

point

1.2

pV

Bandwidth

IF

amplifier

180

kHz

FM

demodulator

1000

kHz

Antenna

terminais

75

Q

(unbalanced)

‘Technics

Matsushita

Electric

Industrial

Co.,

Ltd.

Central

P.O.

Box

288,

Osaka

530-91,

Japan

Tuner

Color

(K)osclesanciids

Black

Type

Area

Asia,

Latin

America,

Middle

Near

East

and

Africa

(K)

Oceania

Far

East-PX

WAM

TUNER

SECTION

Frequency

range

531

kHz~1602

kHz

(9-kHz

steps)

530

kHz~1600

kHz

(10-kHz

steps)

Sensitivity

(S/N

20

dB)

20

pV,

300

pV/m

Selectivity

(+9

kHz)

(at

999

kHz)

50

dB

Image

rejection

(at

999

kHz)

40

dB

IF

rejection

(at

999

kHz)

60

dB

Wi

GENERAL

Output

voltage

0.3

V

(0.6

V

IHF)

Power

consumption

9W

Power

supply

For

Oceania:

AC

50

Hz/60

Hz,

240V

For

others:

AC

50

Hz/60

Hz,

110

V/127

V/220

V/240

V

Dimensions

(W

x

H

x

D)

430

x

64«

290

mm

(16-15/16”

x

2-17/32”

x

11-13/32”)

Weight

2.3kg

(5.1

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

Industriaj

Co.,

Ltd.

World Trade

Center

Bidg.,

4-1,

4amamatsu-cho,

2-chome,

Minato-ku,

Tokyo

105,

Japan

ST-K50

m@

CONTENTS

Page

ACCESSORIES:

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2

TERMINAL

GUIDE

OF

IC’S,

CONNECTIONS

......

0...

c

cece

een

eee

ee

en

eeees

2~4

TRANSISTORS

AND

DIODES

.....................0000-

13

LOCATION

OF

CONTROLS

.......

2...

cc

cece

eens

5

PRINTED

CIRCUIT

BOARDS

AND

REMOTE

CONTROL

OPERATION

...........0-220:e

cece

eas

6

WIRING

CONNECTION

DIAGRAM

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

14,15

DISASSEMBLY

INSTRUCTIONS

.............0.00

cece

eee

7

BLOCK

DIAGRAM

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

2.0000

cece

eee

16,17

MEASUREMENTS

AND

ADJUSTMENTS

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

8,9

FUNCTIONS

OF

IC

TERMINALS

..............00.0.....000e

18

DESCRIPTION

OF

FLPANEL

...............0

cece

eee

eens

9

REPLACEMENT

PARTS

LIST

.................000000.

19~22

SCHEMATIC

DIAGRAM

............0

0.

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eee

10~13

EXPLODED

VIEW

.....

2.2...

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23

m@

ACCESSORIES

®

Stereo

connection

cable.....

1

©

FM

indoor

antenna..........

1

Screws...

0...

eee

2

(SJP2249-3)

(SSA272M)

(XTN3+

10AFZ)

rr

©

e

AC

power

supply

cord.......

1

©

AM

loop

antenna............

1

¢

Remote-control

(SJA173)...For

(GN)

area

only.

(SPB1163T)

transmitter

..............000.

1

(RJA0004)...For

others.

e

AM

antenna

holder........

1

e

Batteries

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

2

(SMA233-1M)

(R03)

:

@AC

attachment

plug

..........

1

ok

CC®

CC

(SJP9215)...For

(GC),

(PX)

Hn

areas.

(EUR64747)...For

(GN)

area

only.

(EUR64746)...For

others.

m@

CONNECTIONS

FM

indoor

antenna

FM

outdoor

antenna

a

Tacks

or

tape

75-ohms

coaxial

cable

(not

included)

AM

outdoor

antenna

AM

loop

antenna

=

Vinyl-covered

wire

(not

included)

Note:

An

outdoor

antenna

should

be

installed

by

a

qualified

technician

only.

4

3

;

}

3

ala

aia

ci

@FM

indoor

antenna

(included)

Attach

to

a

wall

(using

tack

or

tape)

facing

in

the

direction

of

best

reception.

For

best

reception

sound

quality:

An

FM

outdoor

antenna

is

recommended.

Notes:

The

tack

should

not

contact

the

internal

antenna

wire.

©

Disconnect

this

antenna

if

an

FM

outdoor

antenna

is

installed.

HFM

outdoor

antenna

(not

included)

If

the

FM

indoor

antenna

does

not

provide

satisfactory

reception

of

FM

broadcasts,

an

outdoor

antenna

should

be

used.

The

outdoor

antenna

may

be

required

in

a

mountainous

region,

or

if

this

unit

is

located

inside

a

reinforced-concrete

building,

etc.

oe

to

connect

a

75-ohms

coaxial

cable

1.

Remove

a

piece

of

the

outer

C...)

=>

(=

vinyl

insulator.

20

mm

(25/32”’)

2

Twist

the

shield

braid

to

expose

the

core

wire.

—

|

10

mm

(3/8”)

3

Connect

the

shield

braid

and

the

center

conductor

as

shown

below.

Shield

braid

Core

wire

AM

antenna

WAM

loop

antenna

(included)

Connect

the

AM

loop

antenna

to

the

AM

antenna

terminals,

and

attach

it

to

a

column,

rack

or

this

unit

(facing

in

the

direction

of

best

reception).

Notes:

¢

If

this

antenna

is

not

properly

installed,

AM

broadcasts

will

not

be

received.

©

Be

sure

to

connect

the

AM

loop

antenna

even

when

an

outdoor

antenna

is

used.

Pay

attention

to

the

following

points

when

attaching

the

antenna.

©

Do

not

attach

it

horizontally

(to

do

so

would

impair

reception).

¢

Do

not

attach

it

close

to

power

cords,

speaker

wires

or

metal

surfaces

(to

do

so

would

result

in

noise).

©

Do

not

attach

it

close

to

a

tape

deck

(when

the

tape

deck

is

being

used,

chirping

or

beeping

sounds

may

be

received).

When

attaching

the

antenna

to

a

column,

a

wall

or

rack

Affix

it

vertically.

Screws

(included)

Column

y

AM

antenna

holder

(included)

When

attaching

the

antenna

to

the

unit

This

type

of

installation

may

cause

impaired

reception

or

result

in

signal

noise.

If

possible,

attach

the

antenna

to

a

rack,

a

wall,

ora

column.

Move

the

antenna

toward

the

right

or

left

to

find

the

point

of

best

reception.

Rear

panel

of

Screws

(included)

this

unit

AM

antenna

hoider

(included)

WAM

outdoor

antenna

(not

included)

The

outdoor

antenna

may

be

required

in

a

mountainous

region,

or

if

this

unit

is

located

inside

a

reinforced-concrete

building,

etc.

Use

5—12

m

(16—40

ft.)

of

vinyl-covered

wire

horizontally

at

the

window.

Turntable

(not

included)

Refer

to

[4]

at

the

right

(R)

&

Amplifier

(not

included)

Graphic

equalizer

(not

included)

Cassette

tape

deck

(not

included)

SYNCHRO

OUT

EDIT

@

©

IN

REMOTE

CONTROL

Compact

disc

player

(not

included)

Make

connections

in

the

numbered

sequence

by

using

the

included

cables

and

power

cord.

i)

Household

AC

outlet

tH)

Household

AC

outlet

ST-K50

Make

connections

as

described

below

for

remote-con-

trol

operation.

For

information

concerning

the

stereo

connection

cables

of

each

unit,

refer

to

that

unit.

{4]

Connect

the

stereo

connection

cable

(included).

[2]

Connect

the

L-type

cables

(not

included),

[3]

Connect

the

AC

power

supply

cords.

3-1}

Connect

the

AC

power

supply

cord

(included),

Connect

this

cord

only

after

all

other

cables

have

been

connected.

[4]

“AC

OUTLET”

“SWITCHED”

outlet

Power

is

controlled

by

the

power

switch.

This

outlet

is

only

for

use

with

other

audio

equip-

ment.

Also,

do

not

exceed

the

indicated

power

rating

when

connecting

to

this

outlet.

Note:

When

this

unit

is

used

with

the

Technics

amplifier

model

SU-G50,

the

power

indication

becomes

‘500

W

MAX’’,

becoming

lower

than

the

amplifier’s

power

consumption

indication.

This

is

because

the

power

consumption

(510

W

for

the

SU-G50)

indicated

on

the

nameplate,

per

IEC

65

standards,

determines

the

pover

indication

during

maximum

available

output

power.

There

is

no

problem

in

this

respect

ior

home

use,

because

the

amplifier’s

power

consumption

is

290

W

or

less.

m

LOCATION

OF

CONTROLS

Control

section

[1]

Power

“standby

(/on”

switch

(power/m

standby

()

«=

on)

This

switch

switches

ON

and

OFF

the

secondary

circuit

power

only.

The

unit

is

in

the

‘standby’

condition

when

this

switch

is

set

to

the

standby

&

position.

Regardless

of

the

switch

setting,

the

primary

circuit

is

always

‘‘live”’

as

long

as

the

power

cord

is

connected

to

an

electrical

outlet.

[2]“standby”

indicator

(standby)

This

indicator

illuminates

when

the

power

switch

of

this

unit

or

that

of

the

remote

control

is

switched

““OFF”’.

Its

purpose

is

to

alert

the

user

of

the

constant

supply

voltage

to

the

internal

circuitry

even

with

the

power

switch

OFF.

[3]

Remote-control

signal

receptor

(remote

sensor)

[4]

Preset-tuning

buttons

(1-0)

(24

channel

random

preset

tuning)

These

buttons

are

used

to

preset

FM

and

AM

broadcast

fre-

quencies

into

the

memory

of

this

unit,

and

are

also

pressed

to

recall

the

desired

preset

stations.

ST-K50

3

€s)

0)

m@

REMOTE

CONTROL

OPERATION

[5]

Band

selectors

(band)

FM:

Press

this

button

to

listen

to

an

FM

broadcast.

AM:

Press

this

button

to

listen

to

an

AM

broadcast.

allocation:

When

the

AM

button

is

pressed

for

about

4

seconds,

the

AM

frequency

step

will

change

to

10

kHz

per

step.

(This

unit

is

set

to

9

kHz

before

shipment.)

In

order

to

return

to

the

original

frequency

indications,

press

this

button

for

about

4

seconds

again.

[6]

Tuning

buttons

(tuning)

These

buttons

can

be

used

for

tuning

to

the

desired

broadcast

station.

If

the

button

is

pressed

momentarily

and

then

releas-

ed,

the

frequency

will

change

at

intervals

of

0.05

MHz

for

FM

and

9

kHz

(or

10

kHz)

for

AM.

FM

mode

selector

(FM

mode)

This

unit

automatically

switches

to

the

stereo

mode

when

an

FM

stereo

broadcast

is

received.

This

selector

is

used

to

select

the

mode

(stereo

or

monaural)

of

FM

broadcast

signals.

Memory

button

(memory)

This

button

can

be

used

when

presetting

broadcast

station

fre-

quencies

to

the

memory.

Display

section

[A]

FM

stereo

indicator

(stereo)

This

indicator

automatically

illuminates

when

an

FM

stereo

broadcast

is

being

received.

It

will

not

illuminate

if

the

FM

mode

selector

is

set

to

the

monaural

mode.

Digital

frequency

display

Memon

indicator

(/M))

This

indicator

illuminates

when

the

memory

button

is

pressed.

[D]

Channel

display

This

display

shows

the

channel

number

selected

by

one

of

the

preset-tuning

buttons.

[E]

Quartz-lock

indicator

(quartz

lock)

This

indicator

illuminates

when

the

unit

is

tuned

precisely

to

a

broadcast

station.

¢This

remote-control

transmitter

can

be

used

for

control

of

a

Technics

amplifier

with

a

control

terminal,

as

well

as

a

cassette

tape

deck,

turntable,

compact

disc

player,

or

a

graphic

equalizer

with

a

remote-control

terminal.

Consult

your

dealer

for

details.

For

detailed

information

concerning

operation

steps,

etc.,

please

refer

to

the

appropriate

page

for

each

unit

and

the

respective

operating

instructions.

For

this

system,

you

can

listen

to

tapes

or

compact

discs,

etc.,

by

operating

the

remote-

control

transmitter

without

using

the

amplifier’s

input

selectors.

(Refer

to

the

Technics

amplifier’s

operating

instructions.)

=

Ss

Pe

pale)

AM/FM

preset

tuning

|

1

2

3

4

$

6

z

8 9

oO

[=

=<]

deck

<

play»

Mistop

MMpause

!

UW

4a

pe

TreTJorec

mute

FF

|

i

co

i

vu

H

[A]

Press

this

key

to

switch

the

tuner

ON

or

to

the

stand-by

condition.

Note

that

there

is

no

need

to

press

this

key

if

the

tuner's

power

is

ON.

(If

it

is

pressed,

the

tuner

will

be

switched

to

the

stand-by

mode.)

[oo

S|

Press

this

key

to

select

the

desired

preset

chan-

nel.

cs

Press

this

key

to

temporarily

reduce

the

volume

level.

The

volume

level

is

attenuated

by

20

dB

(approx.

1/10).

Press

once

again

to

return

to

the

level.

V

volume

&

OIC

Press

this

key

to

adjust

the

volume

level.

Cassette

tape

deck

keys

ceck

|

Press

this

key

to

select

the

deck

(tape

deck

1

or

tape

deck

2)

to

be

used.

<play|

[play>

|

>:

For

the

‘‘A’’-side

of

the

tape

C4

CJ

<4:

For

the

“B’-side

of

the

tape

Press

one

of

these

keys

to

begin

the

playback

or

recording,

press-

ing

the

key

corresponding

to

the

side

of

the

tape

to

be

played

(or

recorded).

Note:

Depending

on

which

Technics

tape

deck

is

used

in

com-

bination

with

this

unit,

tape

deck

1

might

be

the

‘‘A’’-side

playback-only

type.

deck

pees

Press

this

key

to

stop

tape

movement.

«

»>

|

Co

Press

this

key

to

advance

or

rewind

the

tape

while

the

unit

is

in

the

stop

mode.

Press

this

key

to

select

the

desired

tune

while

the

unit

is

in

the

play

mode.

(Only

applicable

to

a

Technics

tape

deck

with

the

‘music

select”

functions.)

Press

this

key

to

make

a

silent

interval

during

recording.

(After

4

seconds,

the

tape

deck

will

automatically

change

to

the

recording

stand-by

mode.)

To

start

the

recording

again,

press

the

playback

key.

Press

this

key

to

temporarily

stop

playback

or

recording.

C—_]

|Press

the

playback

key

to

resume

the

play

or

recording.

Press

this

key

to

change

to

the

recording

stand-by

mode.

Note

Depending

on

which

Technics

tape

deck

is

used

in

combina-

tion

with

this

unit,

it

might

be

that

record-muting,

pause

of

the

playback

(and

the

recording),

and

the

recording

func-

tions

of

tape

deck

1

not

be

possible

by

using

the

remote-

control

transmitter.

[D]

Compact

disc

player

keys

»

play

'

(__)

|

Press

this

key

to

start

the

play.

@stop

.

Co

Press

this

key

to

stop

play.

iGase

|

Press

to

stop

disc

play

temporarily.

L_1

|

Press

the

playback

key

to

start

the

disc

play.

Hea

skip

SKID

DPI

Co

Press

one

of

these

buttons

briefly

to

move

the

pick-up

to

the

beginning

of

a

specific

track.

If

a

Technics

multi

compact-disc

player

is

used

in

com-

C—]

}

bination

with

this

unit,

the

disc

to

be

played

can

be

selected

by

first

pressing

this

button

and

then

pressing

the

appropriate

‘numeric

button”.

program?

Press

to

select

the

desired

play

mode.

(“program”

or

“‘continue’’)

1

|__[

£2

]

These

buttons

can

be

used

to

select

track

CC]

|

C_)

|

number.

Note:

To

select

a

track

numberd

10

or

higher

in

the

direct

access

play

or

program

play

mode,

first

press

the

“+10”

button

the

necessary

number

of

times

and

then

press

the

appropriate

“numeric

button”.

}

m@

DISASSEMBLY

INSTRUCTIONS

“ATTENTION

SERVICER”

Some

chassis

components

may

have

sharp

edges.

Be

careful

when

disassembling

and

servicing.

Remove

the

5

screws

(@~@).

Removal

of

the

Operation

switch

1.

Remove

the

2screws(@.@).

P.C.B.

and

Remote

Sensor

P.C.B.

2.

Remove

the

front

panel

in

the

direction

of

the

arrow.

eae

RefNo.

|

Removal

of

the

Main

P.C.B.

-2—->

4

é

@

Remote

Sensor

P.C.B.

eRemove

the

1

screw

(@).

1.

Remove

the

2

connector

@

Operation

Switch

P.C.B.

Removal

of

the

connector

(CN701,

CN702).

@Remove

the

4

screws

(Q~@).

2.

Remove

the

4

screws

(Q@~@).

)

peu

Removal

of

the

FL

Drive

P.C.B.

Procedure

0

Soe"

155

@

Claw

AC

Outlet

Cover

‘

o

1.

Remove

the

2

connector

(CN701,

CN702).

2.

Remove

the

3

screws

(@~®).

3.

Remove

the

FL

drive

P.C.B.

in

the

direction

of

the

4.

Release

the

2

claws

of

AC

outlet

cover.

arrow.

5.

Remove

the

main

P.C.B.

in

the

direction

of

the

arrow.

m@

MEASUREMENTS

AND

ADJUSTMENTS

FM

ADJUSTMENT

Control

positions

and

equipment

used

@

FM

signal

generator(FM-SG)

@

Frequency

counter

@

Choke

coil(100yH)

@

Resistor(100kQ)

@

Stereo

modulator

@

Distortion

analyser

e@

DC

electronic

voltmeter(EVM)

Note:

For

Z201

(AM

ANT

and

OSC

coil),

2202

(AM-IFT),

they

are

supplied

as

adjusted

parts.

So,

do

not

turn

the

cores

of

the

parts.

It

is

not

necessary

to

adjust

the

AM

circuit.

FM

MONO

DISTORTION

ADJUSTMENT

FM

SIGNAL

GENERATOR

CONDITION

1.Test

equipment

connection

is

shown

in

figure.

Modulation

2.Set

the

unit

to

“FM”

mode.

3.Set

the

radio

frequency

display

and

signal

generator

to

Output

level

100.10MHz.

4.Adjust

the

core

of

T201

so

that

the

voltage

measured

in

signal

mode

is

OmV(0420mV)

in

300mV

range.

5.Adjust

T202

so

that

the

distortion

factor

of

L-CH

is

minimized.

6.Repeat

steps

4

and

5.

7.Make

sure

that

the

distortion

factors

of

L-CH

and

R-CH

are

nearly

the

same

and

minimum.

Note:

The

adjusting

screwdriver

used

should

be

made

of

resin.

MPX

VCO

ADJUSTMENT

1.Test

equipment

connection

is

shown

in

figure.

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the

unit

to

‘‘auto”’

position.

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the

radio

frequency

display

and

signal

genarator

to

100.10MHz.

4.Adjust

VR301

for

19kHz+30Hz

on

frequency

counter

reading.

USING

ALTERNATE

SYSTEM

1.Receive

the

stereo

broadcast.

2.Adjust

VR301

until

stereo

indicator

lights

up.

Fix

the

arm

of

VR301

as

shown

in

figure.

FM

SIGNAL

GENERATOR

CONDITION

Modulation

0%

(non-modulation)

Output

level

Modulation

frequency

Frequency

counter

“Stereo”

OFF

position

“Stereo”

ON

position

(Indicator

lighting)

Adjust

point

of

pilot

circuit

e

ADJUSTMENT

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list

on

pages

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1

2

3

4

5

(This

schematic

diagram

may

be

modified

at

any

time

with

the

development

a

PRINTED

CIRCUIT

BOARDS

AND

WIRING

CONNECTION

DIAG

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list

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of

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technology.)

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circuit

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with

the

chassis

taken

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standard.

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may

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some

errors

in

the

valtage

volues,

depending

on

the

internal

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use only

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«Caution!

IC

and

LSI

are

sensitive

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static

electricity.

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trouble

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boxes

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