Sony CRF-150 User manual

Table of contents

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ЧЕН

FM/AM

13-BAND

PORTABLE

RADIO

SONY.

SERVICE

MANUAL

‚Section

TABLE

OF

CONTENTS

Title

TECHNICAL

DESCRIPTION

.

1-1.

Specifications

.

Technical

Features

13.

Circuit

Description.

14.

Block

Diagram

1-5.

External

View

1-6.

Major

Parts

Location

DISASSEMBLY

mes

d

2-1,

Chas

Removal.

8

22.

Fm

Tuner

Removal

°

23.

Sw

Tuner

Removal

8

9

24

ср/М

Circuit

B.

Removal

........

10

2-5

Power

Supply

Circuit

Board

Removal

n

2-6.

Af

Circuit

Board

Removal

"

"

2-7.

Dial

Scale,

Dial

Drum

Removal

and

Reassembly

n

24.

Dial

Cord

Restringing

.

n

ADJUSTMENT

PROCEDURES...

14

3-1.

Hf

Alignment

-

,

14

3-2.

Frequency

Coverage

and

Tracking

Adjustment

15

3-3.

Adjusting

Parts

Locations

..

18

3-4.

Voltage

and

Current

Adjustment

19

SCHEMATIC

AND

MOUNTING

DIAGRAMS

20

4-1.

Schematic

Diagram

20

4-2.

Fm

Tuner

Circuit

Board

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

23

43.

SW2-SW10

Front

End

PNE

4-4.

Cp/if

Circuit

Board

_.

28

4-5.

Af

Circuit

Board...

»

4-6.

Power

Circuit

Board

E

47.

Jack

Panel

эз

4-8.

Wiring

Diagram

35

ELECTRICAL

PARTS

LIST

.....

37

PACKING

AND

EXPLODED

VIEW

........

42

61.

Packing

_

3

42

6-2.

Exploded

View

43

SONY.

SERVICE

MANUAL

SUPPLEMENT

SErrewoen,

1970

Subject:

1.

Troubleshooting

guide

USA

model

31,800

02718

ааа

and

lat

GENERAL

EXPORT

“

}

|

model

42,420

J

1.

TROUBLESHOOTING

GUIDE

Trouble

|

Band

Symptom

Сане

Remedy

No

sound

|

mw

1)08V

or

higher

|

1)

Leaky

tuning

1)

Apply

20У

de

between

(Af

circuit

at

the

emitter

of

|

capacitor

the

rotor

and

the

stator

normal

but

0304.

(06

to

of

the

tuning

capacitor

to

no

sound

07

V

in

normal)

Produce

а

spark

from

speaker.)

2)

№

sound

even

|

2)

Defective

bar

antenna

|

2)

Replace

the

сой.

и

"the

bar

|

сой

antenna

сой

is

adjusted

3)

Collector

voltage

|

3)

Internal

resistance

of

|

3)

Replace

the

tuning

meter

at

Q306

is

too

|

—

the

tuning

meteris

too

low.

(2.75V

is

|

high

normal)

Sw2-10

|

No

sound

at

the

|

Shorted

padding

capac

|

Replace

these

capacitors

high-frequency

end

|

itor.

(C247,

C250,

of

each

band

C256,

C259,

C262

Normalsoundatthe

|

C268,

C271)

low-frequency

end

Low

FM

Noise

heard

during

|

Antenna

lead

(coaxial

|

Resolder

the

lead

sensitivity

reception

cable)

of

tuner

touches

the

tuner

case.

sui

Great

difference

in

|

Yellow

lead

of

the

switch

|

Resolder

the

ead.

noise

level

be:

|

is

connected

to

ground.

tween

SHARP

and

BROAD

positions

of

the

SELECTIV

TTY

switch

sw2-10

|

Noise

heard

all

over

|

3.8

to

4.1V

at

the

emit-

|

Adjust

R369

for

45V.

the

SW

bands.

ter

of

Q309.

(45У

is

normal)

Shock

FM

1)

Shock

noise

1)

Shield

plate

touching

|

1)

Separate

the

shield

plate

noise

the

CP

printed

circuit

|

from

the

printed

circuit

,

board board

2)

Shock

noise.

2)

Leads

of

capacitors

|

2)

Cover

the

legs

of these

mounted

on

the

сот

|

capacitors

with

plastic

ductor

side

are

touch

|

tubing.

ing

the

legs

of

IFT

uw

1)

Shock

noise.

1)

Loose

contact

in

the

|

1)

Replace

the

switch

pilot

lamp

switch.

2)

Shock

noise

2)

Loose

nut

on

the

EXT

|

2)

Tighten

mut,

then

secure

ANT

terminal

with

contact

cement

=

4

=

Trouble

Band

Symptom

Cause

Remedy

Oscillation

|

FM

1)

Oscillating

noise

|

1)

Coupling

between

|

1)

Separate

1319

from

1319

and

СЕЗІ.

CF301

2)

Oscillating

noise

|

2)

°S”

curve

is

too

|

2)Lower

the

curve

sharply

adjusted

level

3)

Oscillating

noise

|

3)

Leads

from

the

tuner

|

3)

Separate

the

leads

from

and

antenna

to

5301-2

|

the

printed

circuit

board.

disturb

te

if

stage.

Tuning

FM

Pointer

does

not

|

Leaky

G77

between

|

Replace

C377.

meter

move.

IFT

F301

and

5301-8.

MW

Minimum

pointer

|

R313

misadjusted.

Readjust

R313

for

0.25

to

movement.

028V

at

the

emitter

of

0303.

Wrong

FM

1)

Pointer

docs

mot

aide

|

1)

Make

the

pointer

side

dal

properly.

more

smoothly.

pone

2)

Incorrect

frequency

|

2)

Readjust

the

frequency

indication

pem

w.

Mw

T)

Incorrect

frequency

|

1)

Readjust

the

frequency

coverage.

coverage.

2)

Backlash

2)

Loose

screw

on

the

|

2)

Engage

gears,

and

tighten

double

gear.

the

screw.

sw2-10

1)

Loose

core

in

the

first

|

1)

Fix

the

core

with

an

oscillator

сой.

elastic

band,

or

replace

the

coil

2)

Normal

when

|

2)

Damaged

second

oscil-

|

2)

Replace

the

сой.

the

core

of

the

|

Шогсой.

second

oscillator

coil

is

pulled

ош.

Unstable

392-16

|

1)

No

reception

|

D

Faulty

or

beni

жаза

|

1)

Repair

or

straighten

the

reception

when

the

band

|

іп

the

turret

tuner.

|

contact

selector

is

turned

counterclockwise.

Normal

тесер.

tion

when

these-

lector

is

ішпей

clockwise.

2)

Reception

okay

|

2)

Imperfect

solder

joint.

|

2)

Resolder

the

defective

joint.

Battery

cur-

|

АШ

‘Shorted

0502.

Replace

0502

rent

flows

voltage

at

any

point

when

ac

in

the

circuit.

power

sup-

ply

isop-

erating.

Reverse

Lw

Connect

the

cut

foil

with

operation

on

the

low

fre

|

CF302

and

CF303

is

cut.

|

a

jumper

lead.

of

the

quency

range.

SELECTIV-

ITY

switch.

FM

tuning

|

FM

Tight

dial

Defective

gear

Deepen

gear

teeth,

and

shaft

gear

apply

lubricating

oil

skips.

CRF-150

SECTION

1

TECHNICAL

DESCRIPTION

1-1.

SPECIFICATIONS

Circuit

System:

2-FET,

1Stransistor,

12diode

superheterodyne

Frequency

Coverage:

FM;

87

-

108

MHz

(344

—

278m)

1,605

kHz

(566

—

187m)

LW;

150

—

400kHz

(2,000

—

750m)

SWI;

18—45MHz

(187

—

67m)

-5змн:

(64

—

57m)

SW3:

58-64MMz

(52

-

47m)

SW&

7.0

~7.6MMz

(43

-

39m)

SWS;

95

-

10.1

MHz

(31.6

—

30m)

116

=

12.2MHz

(26

—

24.6)

15.0

—

156мнг

(20—

192m)

175

-

18.1

MHz

(17

—

165m)

SW;

214-

220MM:

(14

—

136m)

SW10;

255

-

26.1Mkz

(118

-

115m}

Intermediate

Frequency:

FM:

10.7

MHz

MW,

LW,

SWI;

456

KHz

SW2—SW10;

Ist:

1.55

-

225

МН

‘nd:

ASS

kHz

Antenna

System:

FM;

telescopic

antenna

or

external

antenna

(impedance

3002)

MW,

LW;

built-in

ferrite

bar

antenna

or

external

antenna

(nigh

impedance)

50:

telescopic

antenna

or

external

antenna

(high

impedance)

‘SW2—SW10;

telescopic

antenna

or

external

antenna

(impedance

752)

FM;

тыу

(0881

MW;

25.12

V/m

(2848/m)

LW;

39.84V/m

(3248/m)

SWI;

тыу

(048)

SW2-SWIO:

14V

(048)

Selectivity:

—

4098

at

1400kHz

HOkHz

off

resonance

Power

Requirement:

Six

"О"

size

flashlight

batterie

9

volts

in

total,

or

house

current

(ae

100V,

117V,

220V,

240V)

'ower

Output

st

10%

distortion:

2.7W

(with

ac

power

supply),

1.1W

(with

battery)

maximum:

38W

(with

ac

power

supply),

1.7W

(with

battery)

Current

Drain

at

zero

signal:

78mA

(with

ac

power

supply),

35

mA

(with

battery)

soon

saka

-4одв

(048

=

0776У)

тоқа

-6048

(048

=

0.775V)

Speaker:

3747

(Bem)

x

614"

(16em,

هه󰾯

Dimensions:

1334"

(W)

x

10!%e"

(H)

x

S14”

(D)

(340mm

x

275mm

x

144mm)

Weight:

15

Ib

7

oz

(79)

150

1-2.

TECHNICAL

FEATURES

*

High-performance

portable

radio

receiver

with

thirteen

bands;

FM,

MW,

LW,

SWI-SWIO.

*

FET

(field

effect

transistor)

with

tripletuned

passive

input

circuit

for

superior

interference

rejection.

*

High-sensitivity

and

selectivity

on

SW

bands

using

double-superheterodyne

front

end.

*

High-fidelity

af

amplifier

with

OTL

circuit.

*

Choice

of

three

power

sources;

house

current,

battery,

car

battery.

1:3.

CIRCUIT

DESCRIPTION

Stage/control

Function

Fm

Tuner

FET

mixer

Usually

an

fm

front

end

consists

ото!

of

an

rf

amplifier,

mixer

and

local

oscillator

as

shown

in

Fig.

I1.

The

rf

amplifier

sometimes

worsens

the

crossmodulation

handling

ability

of

the

receiver

when

ordinary

bipolar

transistors

are

used,

It

is,

however,

diffi

cult

to

eliminate

the

rf

amplifier

because

its

removal

causes

strong

spurious

radiation,

poor

sensi-

tivity,

and

а

poor

noise

figure.

To

solve

this

problem,

the

Model

Fig.

1-1

Usual

fm

front

end

Fig.

12

CRF-150

fm

front

end

Local

oscillator

0102

Afc

diode

D101

Fm

Ы

amplifier

0103

CRF-150

uses

a

low-noise

junc-

tion

FET

for

the

mixer

and

a

triple-tuned

passive

input

circuit

as

shown

in

Fig.

1-2.

The

Model

CRF-150

is

capable

of

clear

fm

reception

even

in

strong

signal-

strength

areas

due

to

the

extremely

superior

interference-

rejection

characteristics

of

the

passive

input

circuit,

The

oscillator

generates

a

fre-

quency

10.7

MHz

higher

than

the

incoming

signal

frequency

and

injects

the

generated

voltage.

at

the

source

of

FET

mixer

0101.

This

diode

is

connected

across

the

resonant

circuit

of

the

oscil-

lator

and

works

as

a

variable-

capacitance

diode.

А

dc

feed

back

voltage

from

the

discri

nator

controls

the

bias

applied

to

the

diode

to

keep

the

local

oscillator.

frequency

correct.

Transistor

Q103

amplifies

the

10.7

MHz

i-f

signal

produced

by

mixer

0101

and

coupled

to

it

through

Hf

transformer

IFT

101.

A

block

diagram

of

the

sw

front

end

is

shown

in

Fig.

1-3.

Such

an

arrangement

effectively

sup-

presses

image

signals,

since

the

high

value

of

the

first

i4

causes

the

desired

and

image

signals

to

differ

greatly

in

frequency.

At

the

same

time,

the

relatively

low

value

of

the

second

if

makes

it

possible

to

obtain

high

amplifi-

cation

as

well

as

sharp

discrimi-

mation

against

signals

differing

only

slightly

in

frequency

from

the

desired

signal.

The

result

is

that

this

double-

superheterodyne

front

end

pro-

vides

a

combination

of

greater

image

suppression

and

higher

adjacent

channel-selectivity

than

can

be

realized

in

a

simple

super-

heterodyne

receiver.

if

stage󰾰

سأ

чае

у

ESE

Fig.

1:3

Block

diagram

of

the

sw

front

end

Age

amp

‘The

age

(automatic

gain

control)

0202

Circuit

consists

of

transistor

0302

Q202

and

diode

0302.

The

carrier

from

the

last

stage

of

the

if

amplifier

adds

a

negative

арс

voltage

on

the

positively-biased

base

of

transistor

Q202

through

diode

D302

as

shown

in

Fig.

1-4.

озо!

В

0

m

Me,

mal

6

ome

07

gal

d

Fig.

1-5

Output

waveform

of

the

age

ud

M

Strip

P

Ist

mixer

Q301

combines

the

signal

озо!

applied

to

its

base

with

the

oscil-

—

lator

voltage

(1.55

-

2.25

MHz

higher

than

incoming

signal)

applied

to

its

emitter

for

conver

sion

to

the

1.55

—

2.25

MHz

Ist

Fig.

1-4

Diagram

of

the

age

Аз

the

signal

becomes

stronger,

Е

the age

level

becomes

higher

SW

tst

м

0303

amplifies

three

am

sig-

sito:

amplifier.

mals;

1.55

2.25

MHz

(SWI

—

decortindy;

the;

collier

SWIO),

$20

—

1,670

kHz

(MW),

current

of

Q202

and

the

drain-

MW,

LW

rf

254 145

410

kB

(LW):

current

of

0201

decrease.

If

amplifier

the

signal

is

small,

0202

0303

increases

the

gain

of

rf

amplifier

Q201

and

the

desired

sensitivity

2nd

oscillator

0304

generates

a

frequency

455

is

obtained

as

shown

in

Fig.

1-5.

0304

kHz

higher

than

the

signals

that

In

this

way,

the

gain

is

controlled

come

from

0303.

automatically.

Fm

if

Q302

amplifies

the

10.7

MHz

1st

focal

‘The

oscillator

generates

a

fre-

amplifier

fm

if

signal

coupled

through

quency

1.55

—

2.25

MHz

higher

0302

ceramic

filters

CF301

and

than

the

incoming

signal

fre-

CF302.

Also,

the

saturation

quency,

and

injects

the

gener-

due

to

high

base

to

emitter

bias

ated

voltage

at

the

emitter

of

clips

the

negative

peak

of

the

Q301.

Тһе

oscillator

fre-

ac

signal

voltage

developed

at

quencies

are

fixed

in

each

band.

the

collector

of

Q302.

CRF-150

Limiter

This

diode

clips

the

positive

D301

Peak

of

ac

signal

voltage

devel

oped

at

the

collector

of

0305.

Fm

if

0305

amplifies

10.7

MHz

fm

+f

amplifier.

signal,

Also,

0305

produces

a

455

kHz

am

Ы

signal

on

its

Am

2nd

mixer

conector,

0305

Power

Supply

Fig

16

Selectivity

selection

circuit

Тһе

CRF-150

uses

a

4-pin

ac

cord

for

its

power

Bs

Asi

supply

and

has

a

powerin

jack

for

a

house

current

100V,

117V,

220V

and

240V

(for

USA

model

117V

VOLUME

control

The

level

of

signal

applied

to

only).

However,

by

using

the

SONY

DCC-2A

Car

VR601

the

power

amplifier

is

deter-

tery

Cord

or

standard

flashlight

batteries

(six

size

mined

by

the

setting

of

VR601.

"D"

cells),

the

CRF-150

can

be

operated

away

from

ап

ас

power

outlet.

Though

diode

0502

prevents

Amplifier

‘Transistor

Q401

amplifies

the

а

reverse

current

flow

through

the

batteries

when

0401

audio

signal

supplied

by

using

а

house

current

or

car

battery,

it

is

better

to

VOLUME

control

VR601.

remove

the

flashlight

batteries

if

they

will

not

be

used

for

a

while,

Audio

driver

These

direct-coupled

stages

0402,

0403

amplify

the

audio

signal

supplied

by

TREBLE

control

VR602

and

BASS

control

VR603,

Sensitivity

Selector

‘The

stage

selectivity

is

obtained

by

using

a

Power

amplifier

This

stage

uses

an

OTL

(output

ceramic

filter

(CF304)

as

а

frequency-selective

0404,

0406

transformerless)

push-pull

class-B

by-pass

centered

at

455

kHz.

This

gives

transistor

amplifier,

Thermistors

CS401

Q304

a

high

gain

at

455

kHz

by

preventing

emitter

and

CS402

temperaturecompen-

degeneration

of

the

signal

at

this

frequency.

Ву

sate

the

base

bias

of

Q404

and

connecting

capacitor

C372

in

parallel

with

filter

0405.

СЕЗ04

(See

Fig.

1-6),

the

BROAD

selectivity

band-

Negative

feedback

from

the

out-

width

is

obtained.

When

the

SHARP

position

is

set,

put

of

0404

and

0405

to

the

the

bandwidth

becomes

narrow.

However,

greater

emitter

of

0403

improves

the

sensitivity

with

less

noise

is

obtained

and

a

weak

frequency

response

and

reduces

signal

can

easily

be

heard,

distortion,

1-4.

BLOCK

DIAGRAM

е

Fig

17

CRF-150

EXTERNAL

VIEW

3419372.

andis,

carrying.

383391].

emblem

"Sony

3835842.

knob,

calibrator

—|

ning

meter

ob

rz

y,

dial

tuning

1607-16913

Jack,

earphone’

56:

—

Bar

A»

band

selector

1514-50311

тмин)

witch,

power

knob,

selectivity

Fig.

1:8

MAJOR

PARTS

LOCATION

—

—

1502241

‘speaker

401-38-23

ant

сой,

mwlw

ferrite

bar

Y38519.11

fm

tuner

block

Y-3871201-1

3833895-

sw

tuner

block

escutcheon,

SW2-SWIO

Bond

selector

152616511

voltage

selector.

153926411

BE

printed

circuit

board,

1614304:

Power

supply.

Hide

switch

15026212

|

d

1

180936211

printed

circuit

board,

Connector,

ext

Eolit

d

power

supply

144153612

transformer,

power.

X3813806.

_

Jack

panel

агу

Fig.

1-9

СВЕ-150

SECTION

2

DISASSEMBLY

21.

CHASSIS

REMOVAL

1,

Pull

off the

six

knobs

shown

in

Fig.

2-1

2,

Remove

the

two

screws

and

carrying

handle

as

shown

in

Fig.

2-1

2

calibrator

1

~

i

ЖА

a

8

trotume

and

tone)

wo

tuning

knots

(ate

and

EM)

Fig.

2-1

3.

Remove

the

battery

lid

and

take

out

batteries

and

ac

cord.

4,

Remove

the

three

screws

shown

in

Fig.

2-2

Fig.

22

Remove

the

four

screws

marked

4

which

fasten

the

front

panel

to

the

chassis

in

Fig.

23.

Loosen

a

screw

marked

o

and

remove

the

telescopic

antenna.

Remove

the

speaker

socket

as

shown

in

Fig.

2-3,

Now,

the

front

panel

is

removable

as

shown

in

Fig.

24.

Remove

the

three

screws

and

two

rubber

foots

as

shown

in

Fig.

2-4

speaker

Socket

Fig.

23

3x20

27.2420

Fig.

24