Sony MICROFILM ST-707RM User manual

-

ST-707RM

is

the

FM

STEREO/

FM-AM

TUNER

in

MHC-2000/

MH

C-3000.

SPECIFICATIONS

System

FM

stereo,

FM/AM

superheterodyne

tuner

General

Quartz-locked

PLL

digital

synthesizer

system

Dimensions

Approx.

245

x

55

x

240

mm

(w/h/d)

(93/4

x

21/4

x

91/2

inches)

FM

tuner

section

incl.

projecting

parts

and

controls

Tuning

range

87.5

to

108

MHz

Weight

Approx.

1.0

kg

(2

Ib

4

oz)

net

Antenna

terminals

75

ohms

unbalanced

Intermediate

frequency

10.7

MHz

Usable

sensitivity

2.3

pV

(S/N

=

30

dB/75

ohms)

MWILW

tuner

section

j

[_

MW

LW

Tuning

range

531

-

1,602

kHz

153

-

281

kHz

{except

Italy)

(except

Italy)

522

-

1,611

kHz

144

-

288

kHz

(for

ftaly)

(for

Italy)

Antenna

Built-in

ferrite

bar

antenna

External

antenna

terminal

Usable

Bulit-in

sensitivity

|

ferrite

bar

250

pV/m

(999

kHz)

500

uVim

(230

kHz)

antenna

External

eerie

100

pV

(999

kHz)

150

pV

(230

kHz)

Signal-to-noise

ratio

52

dB

(50

mWi/m)

|

Harmonic

distortion

MICROFILM

0.3%

(50

mVim,

400

Hz)

|

FM

STEREO/FM-AM

TUNER

SONY.

ST-707RM

REPAIRING

PRECAUTION

f

[To

apply

Btvoltage]

The

power

of

this

units

is

fed

from

other

unit.

When

the

unit

operates

individually,

connect

the

regulated

power

supply

to

the

point

as

shown

in

the

below

figure.

Regulated

power

supply

12V

DC

TUNER

OUT

(L-ch)

TUNER

OUT(R-ch

}

(CHASSIS)

{Tuner

Board]

(Conductor

side)

a

Note

on

Ceramic

Filter

(CF101,

102)

Replacement

and

Diode

D314,

315

Connection.

This

set

employs

two

ceramic

filters

(CF101,

102)

which

should

have

the

same

color

marking

to

identi-

fy

their

center

frequency.

Therefore

FM

IF

offset

ad-

justment

by

diodes

(D314,

315)

connection

is

neces-

sary

to

match

the

center

frequency

of

the

ceramic

filters

used

with

FM

intermediate

frequency.

color

marking

CF101,

102

©:

connect

X:

not

connect

Ceramic

filter

D314,

315

vs

connection

FM

intermedi-

Color

|

Center

fre-

|

KA

|

KB

|

Ate

frequency

mark

|

quency

(MHz)

—

White

10.750

e)

x

10.750

Red

|

10.700

x

10.700

Black

10.650

FM

intermediate

frequency

is

determined

by

the

three

types

as

shown

above.

Ceramic

filters

of

same

center

frequency,

i.e.,

of

same

color

coding

should

be

used

for

CF101

and

CF102.

When

replacing

the

ceramic

filters,

perform

the

FM

Discriminator

Adjustment.

ST.707RM

WARNING

!!

ADVARSEL!

Lithiumbatteri—Eksplosionsfare

Udskiftning

ma

kun

foretages

af

en

sagkyndig,

og

som

beskrevet

i

servicemanualen.

LITHIUM

BATTERY

SHOULD

ONLY

BE

CHANGED

BY

TECHNICAL

PERSONNEL.

THERE

IS

A

RISK

FOR

EXPLOSION

AT

A

WRONG

HANDLING.

“Batteriet

ma

kun

udskiftes

med

et

batteri

af

samme

fabrikat

og

type’.

Because

of

the

risk

for

explosion

the

battery

must

be

replaced

with

the

same

type

and

manufacture.

MODEL

IDENTIFICATION

SONY.

movetno.

ST-707RM

FM

STEREO/FM-AM

TUNER

ST-707RM

|

PARTS

IDENTIFICATION

Display

window

STEREO

indicator

Remote

sensor

Preset

buttons

STEREO/MUTING

switch

ENTER

button

BAND

selector

MEMORY

button

TUNING

+

and

—

buttons

MEMORY

SCAN

button

:

|

ST-707RM

SECTION

1

ELECTRICAL

ADJUSTMENTS

FM

SECTION

Setting:

thd

:

Note:

FM

discriminator

alignment

should

be

made

after

FM

BAND

selector

switch:

FM

tracking

adjustment.

|

em

Tracking

Adjustment

FM

Discriminator

Alignment

(NULL

Check)

Setting:

FM

rf

signal

yo

-

FM

rf

signal

nerator

generator

FM

ANTENNA

terminal

(FM

75)

Carrier

frequency:

98

MHz

FM

ANTENNA

terminal

(FM

752)

Carrier

frequency:

98

MHz

Modulation:

1

kHz,

75

kHz

deviation

Modulation:

1

kHz,

75

kHz

deviation

Output

level:

3.16uV

(10

dB)

Output

level:

1mV

(60

dB)

VOM

Procedure:

(DC

range)

1.

Push

TUNING

(4,

-)

button

for

98

MHz.

2.

Approach

LOO2

and

L003

not

to

contact

each

other.

3.

Adjust

LOO1

and

LOO3,

and

repeat

the

adjust-

ment

2

—

3

times

for

maximum

VTVM

reading.

VTVM

CNP101

Procedure:

1.

Push

the

TUNING

(4,

-)

button

for

98

MHz.

2.

Adjust

IFT101

for

0

V

reading

on

the

VOM.

MAIN

BOARD

(CONDUCTOR

SIDE);

1FT101

CNP101

MAIN

BOARD

{COMPONENT

SIDE)

CNJ201

FS

a

AR

AER

nT

CL

RES

Re

ST-7O07RM

|

FM

OSC

Voltage

Adjustment

Setting:

FM

rf

signal

generator

0.01

uF

oy

set

FM

ANTENNA

TERMINAL

(FM

75Q)

Carrier

frequency:

108

MHz

Modulation:

1

kHz,

75

kHz

deviation

Output

level:

as

low

as

possible

Procedure:

1.

Push

the

TUNING

(+,

-)

button

for

108

MHz.

2.

Adjust

LOOS

for

8

—

8.5

V

reading

on

the

VOM.

VOM

(DC

range)

MAIN

BOARD

(COMPONENT

SIDE)

FM

TUNED

Indication

Lighting

Level

Adjustment

Setting:

FM

rf

signal

generator

FM

ANTENNA

terminal

(FM

759.)

Carrier

frequency:

98

MHz

Modulation:

1kHz,

75

kHz

deviation

Output

level:

22.4nV

(27

dB)

Procedure:

1.

Confirm

that

the

MUTING

indicator

lights

up

on

the

display

window.

2.

Tune

the

set

to

98

MHz.

Adjust

RT101

so

that

the

TUNED

indicator

goes

on.

Pa

Tn

IG

AM

SECTION

Setting:

BAND

selector

switch:

MW

or

LW

AM

rf

signal

generator

Put

the

lead-wire

wr

antenna

close

to

the

set.

Ce

30%

amplitude

modulation

by

400

Hz

signal

e@Repeat

the

procedures

in

each

adjustment

several

times,

and

the

OSC

voltage

and

tracking

adjustments

should

be

finally

done

by

the

trimmer

capacitors.

@

Perform

after

LW

TRACKING

ADJUSMENT.

|

ST-7O7RM

ST-707RM

|

VTVM

-

fcee

+

MAIN

BOARD

Ps

.

-

(CONDUCTOR

sive)”

we

ass

Ly

MW

TRACKING

ADJUSTMENT

Adjust

for

a

maximum

reading

on

VTVM.

LW

TRACKING

ADJUSTMENT

Adjust

for

a

maximum

reading

on

VTVM.

—-162kHz

270

kHz

MAIN

BOARD

(COMPONENT

SIDE)

M

NN

©

®

ie]

©

©)

L023

CT022

L025

CT024

MW/LW

OSC

Voltage

Adjustment

Procedure:

1.

Set

BAND

selector

switch

to

MW.

for

8

—

8.5

V

VOM

(2)

reading.

4.

Set

BAND

selector

switch

to

LW.

for

8

—

8.5

V

VOM

(1)

reading.

2.

Push

TUNING

(+,

-)

button

for

522

kHz.

Ad-

just

L023

for

1

—

1.1

V

VOM

(2)

reading.

3.

Push

the

button

for

1,611

kHz.

Adjust

CT022

vom

@:

Mw

VOM

@®:

LW

(DC

range}

(DC

range)

Push

TUNING

(+,

-)

button

for

144

kHz.

Ad-

just

LO25

for

}

—

1.1

V

VOM

(1)

reading.

6.

Push

the

button

for

288

kHz.

Adjust

CT024

ee

Oe

Ree

eee

ee

ey

|

ST-707RM

__—ST-707RM

|

ie

ee

SECTION

2

DIAGRAMS

2-1.

PRINTED

WIRING

BOARDS

.

See

page

14

for

Semiconductor

Lead

Layouts.

[

MAIN

BOARD}

Be

reais.

i

A

Note:

e

@

:

parts

mounted

on

the

conductor

side.

|_|

[ANTENNA

BOARD]

@

{

&

indicates

side

identified

with

part

number.

2

8

UK

model

Bl

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|

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sore)

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toes

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es

2

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a

ee

FM

759

C

el

n—

(CHASSIS)

|__|

Lai

-

Semiconductor

Location

D

[Lw7

aw

]

-—O

LW/MW

Ref.

No.

Ref.

No.

|

1c101

|

D-4

p004.

|

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C-3

DO021-1

|

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1C301

F-6

D021-2

|

B-5

1C302

|

F-8

D022-1

|

C-6

ST

TOTRM!

Ic401

|

G-9

D022-2

|

B-5

E

Pa

1C402

|

F-3

D101

|

D5

;

qao01

|

C-7

D201

D-3

Q002

D-8

D202

H-1

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(CHASSIS)

Q003

|

D-8

D301

|

E-3

ERR

Q004

|

£8

D302

F-5

Q021

|

D-7

D303

F-5

BLKD

<BRYD

Q022

|

C-5

D304

E-4

F

;

Q023

|

D-7

D305

E-4

;

Q024

|

C-4

D306

E-4

a028

|

B-5

D307

E-4

029

|

B-6

D308.

|

-E-4

|

Q101

|

D-6

D309

E-4

Q201

|

D-3

D310

E-5

Q202

|

D-3

D311

E-5

0301

|

£3

p312_-|

£5

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&

Q302

|

F-7

D314

E-6

[

IOKEY

BOARD)

Q303

|

F-7

D315

E-6

Q304

|

F-7

D316

|

E-5

=

|

Q305

|

F-7

D317

E-6

Q306

F-7

D319

F-3

|

0307.

|

-F-7

D320

|

G4

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ve

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Titi

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SENSOR

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a

Peay

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UTO

—-

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[MEMORY]}

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LILI

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LILI

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LCDI

Q402

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|

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D002

|

C-7

D003

|

C-8

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J

||

BAND

STEREO/MUTING

—9—

—10—

2-2.

SCHEMATIC

DIAGRAM

1

2

-

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page

13

for

note.

3 4 5

ST-707RM

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in

uF

unless

otherwise

noted.

pF:

uur

50WV

or

less

are

not

indicated

except

for

electrolytics

and

tantalums.

Alt

resistors

are

in

Q

and

1/,W

or

less

unless

otherwise

specified.

A

:

internal

component.

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See

page

3

“Note

on

ceramic

filter

replacement

and

diode

connection”.

Voltages

are

dc

with

respect

to

ground

unless

otherwise

noted.

Readings

are

taken

under

detuned

conditions

with

a

VOM

(50kQ/V).

No

Mark:

FM

Mode

Voltage

variations

may

be

noted

due

to

normal

production

tolerances.

Waveforms

are

taken

to

ground

in

no-signal

mode

by

using

oscilloscope.

Voltage

variations

may

be

noted

due

to

normal

production

tolerances.

>

B+

bus,

:

B—

bus.

:

adjustment

for

repair.

+

FM

signal

path.

>»

MW

signal

path.

:

LW.

signal

path.

C101

=LA1265

LI

FM

IF

AMP

@

1C201

LA3401

3)

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QUADRATURE

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0)

ENTER

MEMORY

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+

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BAND

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43

OFF

TC9172P

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FLIP

—

FLOP

|

iF

COUNTER

CONTROL

PORT

10401

HYSTERESI:

COMPRRAT

CX20106A

INTEGRATOR,

®

Semiconductor

Lead

Layouts

US1060M

HZS6C3L

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KV1310

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view!

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20

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BA1F4Z

BN1A4M

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=

Sony MICROFILM ST-707RM User manual

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