Technics ST-610-L Service Manual

ServlceM

anL

Tuner

C3uzr,nrZ

Synthesizer

LW/MW/FM Stereo Tuner

SPECIFICATIONS

(DrN

45 s00)

FM TUNER

r

Frequency range

Sensitivity

's/N

30

s/N 26 dB

20 dB

slN

tHF 46

dB

Total harmonic distortlon MONO

s/N Frequency

Alternate channel

Capture ratlo 1.0

tmage releitlon at 98 MHz

lF reiectlon

Spurious responsé

AM suppresslon Stereo

separation

Carrier leak í9 kHz

Channet Limiting

Bandwidth lF

Antenna

SECTIOhI

dB

quieting

stereo

response

selectlvity normal t400 kHz

at

MHz

98

kHz

38

balance point

terminals

(250

ampliÍier

FM demodulator

rejection

fnz

t

10 kHz

Hz-6,300 Hz)

.

'

87.50-108.00 MHz

sensitivity

STEREO

MONO

STEREO

20 Hz-15

at 98 MHz

.

pV (lHF,

1.5

.

70 65

.

kHz,

t0.5 dB--1.5

dB

-30

dB

-45

7SA

(50

kHz:step9)

pV

1.3

1.2

rrV

pV

0.e

pvt7so

28

(78

dB

dB,

(70

dB

dB,

(-35

dB,

(-50

dB,

+1.5

1

1000

(unbalanced)

usable)

(7so)

0sA)

(7so)

o.15%

O.3o/o

6s dB

45dB

90 dB

75dB

s5 dB

40 30 dB

1.21tY

80

tHR tHR

dB dB

dB

tHF) IHF)

dB

kHz kHz

5T.61OL

Color

(R

(s)

Area

Country

Code

(E)

(EB)

(En

r AM TUNER SECTION

Frequency

MW LW

sensirivity selectivity

lmage

lF rejectlon MW

range

(s/N

(+9

reiectlon

LW

20 dB)

kHz) MW

LW

(at

MW

(at

LW

(at

999

(at

254 kHz)

'

Mw

LW

(at

999 kHz)

(at

254

999 kHz)

254 kHz)

kHz)

Continental Europe Great

France

530 kHz-1620

Area

Britain

.

!';r.

..

522kHz-1611

'155

kHz-353 kHz

153 kHz-351 kHz

kHz)

r GENERAL

Outputvoltage

consumptlon

Power

Power supply

For Great For others:

Dlmensions Weight: Notes:

1.

Specifications

2. Weight

3.

Total harmonic distortion is measured by the digital specírum analyzer

pritain:

(WxHxD):

are

3045

subject

system).

and dimensions are

(H.P.

to

change

approximate.

(16t

without

.... BlackType

...

.

(9

kHz

(10

kHz

(9

(-2

pV,300 pV/m

20

0.3v(0.6vtHR

AC 50 Hzl60 Hz,Z4OV AC 50 HZJ6OHz,220Y

430x69x290 mm

s/r

223/sz"

o"X

2.4k9

notice.

SilverType

Color

(K) (s) (K)

(s)

(R

kHz-steps) kl'tz-steps) kHz-steps)

kHz shift)

50 50

s0 dB

40 dB 40 dB

60 dB

60dB

.

9W

xl17Aa')

(s.3lb.)

PV dB

Technics

Matsushita

Central P.O. Box 288,

Electric

lndustrial

Osaka 530-91, Ja

Go.,

Lt'

!

I

t

I

r CONTENTS

ACCESSOHIES

-

.

tl:i.

..:.

...;...

..

...

'-l'-

CONNECTIONS. LOCATTONSOFCONTROLS

DISASSEMBLY

INSTRUCTIONS

MEASUREMENTSANDADJUSTMENTS

PANEL

FL

DESCRIPTION FUNCTIONS

OF

]CTERMINALS

OF

. .. .

SCHEMANCDIAGRAM

r ACCESSORIES

oAC

power

For

[EB]area

For others

oStereo

(sJP2276)

oFMindooranténna

(ssA270M)

I

CONNECTIONS

supply

only

areas

cord

(SJA193)

(SFDAC05E03)

. . ; . . .. ..

...:..

Page

......

..:.2

......3

. ... 4

......5,6

. .

.

.. . 6

....,.

..8-11

.

..

?

7

TERMINALGUlDE OF IC!S,

TRANSISTORS AND

CIRCUIT

BOARDS AND

WIRING CONNECTION

DIOOES

DIAGRAM

.

BLOCKDIAGHAM

REPLACEMENTPABTSLIST .........

EXPLODED

VIEW

indlcation AM used

The

MW and

both

LW.

. 12.

...... 14,15

......... 16-19

includes

here

Page

11

13

An outdoor

Note:

(Necessary

reinÍorced-concrete

antenna

mounlainous

in

should be

reQions,

buildings.

inside

etc.)

installed

by a competent technicían only.

rackor'.o't

Stereo connection cable

.

Áttach

oÍbest

.

Tačk

r

Foi na is

.

Disconnect this antenna

stalled.

(included)

'o

receptiqrt

shoulct

reception

best

recommended.

To

tuner

the ampliÍiel

oí

. *21l,iusing ta'ck

hoť

input

.'.

'

contact

sound

AC

(included)

terminals

íacing]ih'oírection

tape)

or

.'

-,,].

internal

quality.

if

an FM outdoor antenna

power

Fit a

power

.':

antenna

an FM

supply

\

'.f

Suitable

supply cord.

':.

cord

'_'.

wiré:

outdoor

Household

AC oullet

/

plug

to the

:

.

'

anten-.

;''''.''','"

'

is in-

AC

.

ť

. :.

-

,.

(Necessary

regions.

concrete Use 5 vinyl-covered

horizontally

inside

builctings, etc.)

12

-

in mountainous

reinÍorced-

(16

wire

the

40

-

window.

m

at

Ít') oÍ

(16

12 m

Vinyl-covered wire

-

40 Ít.)

(option)

-2-

lÍ

this antenna

AM

broadcasts

Be sure to

when

even

property

is not

will not be

connect the AM

an outdooí

antenna

installed,

received.

loop

antenna

is

used.

I LOCATIONS

CONTROLS

OF

Power "standby

(power/r

This switch switches

power The unit

to the standby

primary

the

is connected

only.

is in

standbY

"standby" condition

the

posilion.

cb

is

circuit

electrical

to an

Ó/on''

Ó

ON

always

switch

_

on)

oFF the

and

Regardless

"live"

as long

outlet.

stereo

FM

indicator

This

stereo

an FM Note:

not

will

lt

the

set to

Digital

The reception

selected

ing butlons

secondary

this switch

when

the switch

oÍ

as the

indicator

automatically

broadcast

illuminate

monaural

írequency

using the tuning

by

is

Quartz-lock

(quartz

This indicator

precisely

setling,

power

is being

iÍ

FM

the

mode.

Írequency

indicated

lock)

to

circuit

is

set

cord

(stereo)

illuminates

received.

mode selector

display

the

oÍ

buttons or

a

digital-type

by

indicator

illuminates

FM or AM

an

when

FM

when

station.

or

is

AM

the

display.

tuned

broadcast

pÍeset-tun-

lndlcatlon AM used

The

both MW and LW.

Band

selectors

FM: Press this button MW: Press

this

button to

allocatlon:

This step

When

seconds,

10

kHz

ohis

to the appropriate

Set

ln

order lo

tion,

LW: Press.this

is

butlon

either 9

oÍ

MW

the

peí

step.

is

step

set

return to the original

press

this

button

íreq shlít: When

the LW butlon

seconds during reception

írequency

the LW

So, íor example, to

kHz,

]n

tion,

and

order lo

press

then

return

lhis

(band)

to listen to an

listen to an

used to

also

10

kHz

or

is

button

Írequency step

MW

kHz beÍore shipment.)

to 9

position

Íor about

button

listen

to

is

will decrease by 2

receive

press

this

the original

to

Íor aboul

button

here lncludes

FM

broadcast.

MW broadcast.

select a

kHz.

pressed

to

pressed

oÍ an LW

button.

tor

will

your

Íot

írequency indica-

4

seconds

an LW broadcast.

íor about

153 kHz'

tune lo

írequency

4

seconds

Írequency

about

change

locality.

a9ain.

broadcast,

kHz.

'l55

indica-

again.

4

to

4

Memory

This

memory

Channel

The channel number tuning

indicator

butlon

buttons

illuminates

pressed.

is

display

is

displayed.

Signal-strength

These indicators

being

signals

reception,

Íor

tion illuminate

show

received

completely to

(El)

when

se]ected

indicators

the

by

FM

and AM'

íor

the

pÍeset'

by the

(signal

relative

strength

is

The

when

the antenna.

right.

Preset-tuning

(24

channel

These buttons Írequencies

lo select

Note: Fle'er

into

the desired

page

to

)

oÍ broadcast

best condi-

indicators

the

buttons

random

are used

the

6

íor

presst

preset

to

memoíy

preset

Írequencies.

inÍormation concerning

Tuning buttons

These to the desired broadcast station.

Memory

This

oí the

FM

This when a steíeo lo not

(1-0)

tuning)

FM

oÍ this unit, arrd are

and AM broadcasl

presel

are used

buttons

button

is

button

used

preset-tuning

mode selector

unit automatically

listen

illuminate

also

in

the

pressed

memoÍy.

broadcasl

monaural in

the

(tuning)

Íor

tuning

(memory)

preset

when

buttons is made.

switches

mode. The slereo

monaural mode.

memory

(FM

mode)

received. Press

is

into

the

setting

stereo

button

this

indicator

mode

will

I DISASSEMB

INSTRUCTIONS

LY

..ATTENTION

chassis

Some

No.

Ref.

1

Procedure

1

rRemove

No.

ReÍ.

3

Procedure

1+2+3

SERVICER''

components

may

Removal of the

6l ,.^- ,/

the 5 screws

(O-O).

Removal P.C.B. and

LED

have sharp

Cabinet

Operation Switch

of the

P.C.B.

LED

edges.

Be carefulwhen

disassembling

No.

HeÍ.

2

Procedure

1+2

Frontpanel'

1. Remove

Remove

2.

ReÍ. No.

4

Procedlire

.

1+4

and servicing.

Removal

of the Front

-N-

i

o

screws

panel

(O,

O).

in the direction

4screws

the 2

tl"te Íront

Removal oÍ the Main P.C.B.

1.

Remove the 2 connector

2.

Remove the

Panel

the arrow.

oÍ

(eN701,

((D:@).

CN702).

Oper

r,r^1|

P.C.l

r LED P.C.B.

oRemove

I

Operation

oRemove

Ref.

5

No.

1

the

Switch P.C.B.

the 4

Removal

Procedure

1-+5 o

screw

screws

(Q).

(O-g).

of

FL Drive P.C.B.

the

FL Drive P.C.B.

o

T

1

Remove th

2

Remove th

3

Remove th

connector

e 2 e 3 screws

FL drive

e

(CN701,

(O-O).

P.C.B.

CN702).

in the direction

the arrow.

of

3. Remove the 4

4. Remove

the

screws

main

(O-O).

P.C.B.

in the

direction of

the

arrow.

o

Replacement of the Foot.

1. Remove the 4 heat melted

or

nippers

To replace

2.

with a

I

MEASUREMENTS

r FM

similar tool.

the Íoot

soldering

(RlG0009-1)

iron.

ADJUSTMENT

Conlrol

.

I

porltlonr

FM signalgenerator

Stereo modulator

rnd

posts

on the chassis

the

on

equlpmenl

(FM-SG)

chassis'

AND

ured

pair

with

a

melt

the 4

ADJUSTMENTS

o Distortion analyser o

o Oscilloscope

íigure.

range.

oÍ

L-CH

parts.

generator

of L-CH is

and R-CH

For Z201and7202,

Note:

MONO DISTORTION ADJUSTMENT

FM i.test equipment

unit

2.Set the the

3.Set

100.10MH2.

4.Adjust

signal mode

S.Adjust

minimized.

6.Repeat steps

7.Make

are

Note:

to

radio Írequency display and signal

the

core'ot T2O1 so that the voltage measured

T2O2

sure

that

nearly

the same and

The

adjusting screwdriver used should be made

resin.

they are

connection

'Fll'

is

OmV

so that

4

and

5.

the

mode.

(0t20

mV) in 300

the

distortion

minimum.

supplied

is

shown

distortion

íactors

adjusted

as

in

mV

factor

of

posts

So, do not

to in

oí

o

Choke coil

.

Resistor(100k0) Frequency

o DC

electronic voltmeter(EVM)

tum the

FM Modulation Modulation

Output

(100pH)

counter

cores oÍ the

SIGNAL GENERATOR

parts.

..........................100%

frequency

level

.........................66d8

FI_s6

lag;l ffi

|:::'T.TJ

ili

;!*_==+==-Íl;

(RlG000e-1)

CONDITION

kHz

.........1

. Unil

l,":iifu

l'_a"-T7

75o

lll

lll-:.//;

Foot

0c

m

l /áÍ l

EYra

Ír_íal

llďo*o-v l

MPX VCO

1.Test

2.Set the

3. Set the radlo frequency

ADJUSTMENT

equipment

unit

to

connection

"auto"

1fil.l0ilHz

4.Adjust

.USING

1.Apply

2.Adjust

reading.

ALTERNATE

stereo

broadcast.

VR301

VH301

oÍ

vR30í for

signal Írom

until

as

shown in figure.

fr.s

is

shown in

position.

dlsplay

19kHzt3OHz

SYSTEM

stereo indicator lights

and

generator

slgnal

frequency

on

or

Íigure

genarator

receive

up.

Fix

counter

the

to

stereo

arm

-5-

FM

SIGNAL

Modulation Modulation

Output |eve|........ 66dB

,-r*x-'

GENEBATOB CONDITION

............. ............0%

írequency ........0

g

-

kHz

ffi

lralffiil ol I hmrolB-

l;-*l l- T:91*:

looo

""i'l

FllALÍ(7to)

l

w

lcu..r

ili__:s___:ll

-J-

-.

) ,o,

@-@,

O-O.......

@-@.......

@..............

"Storoo" "Storoo"

(lndlcator

polnt

AdJuot

clrcult

OFF

posltlon

ON

llghtlng)

oí

posltlon

pllot

\DJUSTMENT

POINTS

O UTPUT

Í-l

"

AM

ANT

LooP

AMANTI

FM

p300O1

ANT

p

75Or

ll oHo

.t!

FM

(19

L324

MPX VCO

kHz )

L32

n

L322

n

u

r-r

,^^,

FM FRoNT-END

6=rel i-l t-l

lo

sl

I lH

z2202ll

i6

rEEa

/

I I

\rq

IET

FM offset

mC

DEsÓRlPTloN

GRID

Note: The

CONNECTION

ASSIGNMENT

grid

of 3G and

CONNECTION

PIN NO. 1 2

NO. 19 20 21

F1 F1 NP h f

oF

FL PANEL

are used

8G

3 4 5 6 7

22 23 24

[FLsOl

for external

I I 10

8G

AM

MW

25 26 27 28 29

(SAD8MTIOZYK)]

connection.

LW

CA

11 12

7G c

30

q

uartz

fEl

ch.

14

13

a

31 32 33

15

6G

í:l

{-l

e d

16

34

h

lock

17

18

g

5G

35

CONNECTTON

4G NP NP 3G

NP

b

NP

ch

2G NP u 1G

NP F2 F2

L