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Service

M

SPECIFICATIONS

Circuit:

Frequency

Range:

Intermediate

Frequency

:

Power

Supply:

Power

Output:

Speaker

:

Dimensions:

Weight:

18-transistor,

10-diode,

4-rectifier,

1-thermistor

superheterodyne

system

with

AGC

&

AFC

LW

150~370

KHz

MW

530~1600

KHz

SW1

1.6~4.3

MHz

SW2

3.9~12.0

MHz

SW3

12.0~26.5

MHz

FM

86.5~108

MHz

AM

455

KHz

FM

10.7

MHz

DC

12

Volts

(UM-1

battery

x

8

pcs.)

or

AC

110,220,240

Volts

50/60

cycles

1.2

watts

(maximum)

6”

x4”

Oval

P.D:.S.

4

ohms

12”(W)

x4

3/4”

(D)

x8

1/4’

(H)

llpounds

without

batteries

anual

i

MODEL

FV-1710

a

eel

he

ain

a

Te

TRANSISTOR

COMPLEMENT

2SA234

(B)

or

(C)

AM

Oscillator

Ql

Q2

Q3

O4

Q5

06

Q7

Q8

Q9

Q10

Qu

Q12

Q13

Ql14

Q15

Q16

Q17

Q18

25A234

(C)

2SA234

(C)

29A435

(B)

2SA235

(C)

2SA235

(A)

25A234

(B)

25A234

(A)

25A234

(A)

25B75

(B)

25B75

(B)

2SB77

(B)

2SB77

(B)

2SB77

(B)*

25B77

(B)

2SA12

(A)

AM

RF

Amplifier

FM

Mixer

FM

Amplifier

FM

Oscillator

FM

Mixer

1st

IF

Amplifier

2nd

IF

Amplifier

3rd

IF

Amplifier

Audio

Amplifier

Audio

Driver

Audio

Output

Audio

Output

Audio

Output

Audio

Output

BFO

2SB370

(A)

or

(B)

Power

regulator

2SB370

(A)

or

(B)

Power

regulator

HAYAKAWA

ELECTRIC

CO.,

LID.

OSAKA,

JAPAN

GENERAL

DESCRIPTION

The

circuitry

used

in

this

six

band

portable

radio

incorporates

18

transistors,

10

diodes,

4

rectifiers

and

1

thermistor.

A

bar

antenna

feeds

the

LW

or

MW

broadcast

signal

to

the

converter.

A

telescopic

antenna

feeds

the

SW

or

FM

broadcast

signal

to

the

mixer.

The

AM

Singal

goes

through

2

IF

amplifiers

and

1

diode

detector.

The

FM

signal

goes

through

3

IF

amplifiers

and

2

diode

detector.

(matched

pair).

The

audio

signal

then

passes

through

a

6

transistor

audio

amplifier

circuit.

Local

oscillator

voltage

is

fed

back

to

the

mixer.

An

AM

AGC

voltage

is

fed

back

to

1st

IF

amplifier.

~

NS

OF

Ie

f

CHASSIS

REMOVAL

Slide

the

battery

cover

lock

button

to

OPEN

position

and

remove

the

battery

cover.

Remove

the

2

screws

retaining

the

back

cover

and

remove

the

back

cover.

Remove

all

the

jacks

(Car

Ant.,

Ext.

Ant.,

Phono,

Tuner

Output,

Earphone)

and

the

AC/DC

power

selector

knob

from

the

back

cover.

Detach

the

dial

cord

string

from

the

pointer.

Remove

the

AC

power

indicator

light

from

its

socket.

Pull

off

the

4

knobs

on

the

front

of

the

cabinet.

Take

out

the

battery

case.

Remove

7

chassis

mounting

screws

@.

And

the

chassis

can

be

removed.

Exercise

caution

to

avoid

breaking

the

leads.

If

necessary,

unsolder

the

leadwires

attached

to

the

chassis.

Battery

Case

Holding

String

Figure

1

ALIGNMENT

INSTRUCTION

Should

it

become

necessary

at

any

time

to

check

the

alignment

of

this

receiver,

proceed

as

follows:

1)

Connect

an

output

meter

across

the

speaker

voice

coil

lugs.

2)

Set

volume

control

for

maximum.

|

3)

Attenuate

the

signals

from

generator

enough

to

swing

the

most

sensitive

range

of

the

output

meter.

4)

Use

a

non-metallic

alignment

tool.

5)

Repeat

adjustments

to

insure

good

results.

ALIGNMENT

CHART

AM

Alignment

Signal

generator

Receiver

|

Adjust

Step

|

Band|

Connection

to

receiver

|

Input

signal

frequency

|

Dial

setting

Remarks

1

|

MW|

Connect

signal

generator

|

Exactly

455KC.

(400%,

|

Tuning

gang

fully

|

Adjust

for

maxi-

|

T-8,

T-6

through

a

10KOQ

resistor

|

30%,

AM

modulated.)

open.

mum

output

on|

T-2

to

the

antenna

tuning

7

(minimum

capacity)|}

the

output

meter

|

T-l

condenser.

connected

to

the

Ground

lead

to

the

rece-

|

speaker

voice

coil

iver

chassis.

lugs.

Use

radiating

loop,

loop

|

Exactly

525KC.

(400%.

|

Tuning

gang

fully

|

Same

as

step

1.

of

several

turns

of

wire,

|

30%,

AM

modulated.)

closed.

or

place

generator

lead

(maximum

capacity)

close

to

receiver

for

adequate

signal

pickup.

|

Connect

generator

output

to

one

end

of

this

wire.

3

|

MW|

Same

as

step

2.

Exactly

1650KC.

(400%,

|

Tuning

gang

fully

Same

as

step

1.

30%,

AM

modulated.)

open.

(minimum

capacity)

C14

Same

as

step

2.

Exactly

600KC.

(400%,

30%,

AM

modulated.)

600KC

eS

(pee

30%,

AM

modulated.)

See

NOTE

A.

L1M

5

|

MW|

Same

as

step

2.

Exactly

600KC.

(400%,

|

600KC

>

Same

as

step

1.

L14

30%,

AM

modulated.)

Same

as

step

2.

!

Exactly

1400KC.

(400%,

|

1400KC

Same

as

step

l.

C9

Exactly

1400KC.

(400%.

|

1400KC

Same

as

step

l.

C19

30%,

AM

modulated.)

9

|

LW

|

Same

as

step

2.

Exactly

145KC.

(400%,

|

Tuning

gang

fully

|

Same

as

step

1.

L6

30%,

AM

modulated.)

closed.

(maximum

capacity)

10

|

LW

|

Same

as

step

2.

Exactly

380KC.

(400%,

|

Tuning

gang

fully

|

Same

as

step

1.

C13

30%,

AM

modulated.)

open.

(maximum

capacity)

Same

as

step

2.

Exactly

180KC.

(400%,

|

180KC

Same

as

step

4.

30%,

AM

modulated.)

12

|

LW

|

Same

as

step

2.

Exactly

180KC.

(400%‘

|

180KC

Same

as

step

1.

?

30%,

AM

modulated.)

Signal

generator

Receiver

Step

|

Band

|

Connection

to

receiver

|

Input

signal

frequency

Dial

setting

|

Remarks

13

|

LW

|

Same

as

step

2.

Exactly

350KC.

(400%,

|

350KC

Same

as

step

1.

C18

30%,

AM

modulated.)

14

|

LW

|

Same

as

step

2.

Exactly

350KC.

(400%,

|

350KC

Same

as

step

1.

C8

30%,

AM

modulated.)

15

|

LW

|

Repeat

steps

9,

10,

11,

12,

13

and

14

until

no

further

improvement

is

obtained.

16

|SW1]|

Connect

signal

generator

|

Exactly

158MC.

(400%,

|

Tuning

gang

fully

|

Same

as

step

1.

L8

through

a

10KQ

resistor

|

30%,

AM

modulated.)

closed.

to

the

external

antenna

(maximum

capacity)

jack.

Ground

lead

to

the

rece-

iver

chassis.

|

cate

pe

Pacem

each

gg

all

ee

eee

i

Ne

ate

eee

nc

ere

ge

he

ee

17

|SW1)|

Same

as

step

16.

Exactly

4.5MC.

(400%,

|

Tuning

gang

fully

|

Same

as

step

1.

C15

30%,

AM

modulated.)

open.

(minimum

capacity)

fon

ee

ee

et

i

ee

ee

oe

as

pee

ee

ere

PS

a

18

Iswi

Same

as

step

16.

Exactly

1.7MC.

(400%,

|

1.7MC

Same

as

step

1.

L2

|

30%,

AM

modulated.)

19

)/SW1)|

Same

as

step

16,

Exactly

1.7MC.

(400%,

|

1.7MC

Same

as

step

1.

15

30%,

AM

modulated.)

20

|SW1/|

Same

as

step

16.

Exactly

3.7MC.

(400%,

|

3.7MC

Same

as

step

l.

C10

30%,

AM

modulated.)

21

|SW1)

Same

as

step

16.

Exactly

3.7MC.

(400%,

|

3.7MC

Same

as

step

l.

C20

30%,

AM

modulated.)

et

I

ne

Ne

ee

ee

22

sw.

|

Repeat

steps

16,

17, 18,

19,

20

and

21

until

no

further

improvement

is

obtained.

‘

23

|SW2)\Same

as

step

16.

Exactly

3.8MC.

(400%,

|

Tuning

gang

fully

|

Same

as

step

1.

L9

30%,

AM

modulated.)

open.

(maximum

capacity)

24

|SW

2)

Same

as

step

16.

Exactly

12.2MC.

(400%,

|

Tuning

gang

fully

|

Same

as

step

1.

C16

30%,

AM

modulated.)

open.

(minimum

capacity)

a

NN

ee

ets

sees

ec

Be

Sno

ee

ne

a

A

ee

at

a

ee

ee

ee

25

|SW2|

Same

as

step

16.

Exactly

4.5MC.

(400%,

|

4.5MC

Same

as

step

l.

L16

30%,

AM

modulated.)

27

|SW2|

Same

as

step

16.

Exactly

10MC.

(400%,

|

10MC

Same

as

step

l.

Cil

30%,

AM

modulated.)

De

|

PLE

eae

ene

eevee

eNO

NUON

ek

es

Sd

OSC

OS

RN

5

aA

Oe

Se

|

Se

OR

NN

Reser

CON

ree eet

ee

eee

ere

28

|SW2|

Same

as

step

16.

Exactly

10MC.

(400%,

|

10MC

Same

as

step

1.

C2li

30%

AM

modulated.)

I

NCS

ee

ce

ne

a

a

ete

SC

RE

a

a

RGR

|

PO

RL

yc

ee

ee

(See

eine

eee

een

eee,

29

[swa|

Repeat

steps

23,

24,

25,

26,

27

and

28

until

no

further

improvement

is

obtained.

30

|SW3j

Same

as

step

16.

Exactly

11.8MC.

(400%,

|

Tuning

gang

fully

|

Same

as

step

1.

L10

30%,

AM

modulated.)

closed.

|

(maximum

capacity)

31

|SW3)|

Same

as

step

16.

Exactly

11.8MC.

(400%,

|

Tuning

gang

fully

|

Same

as

step

1.

ies

by

30%,

AM

modulated.)

closed.

(maximum

capacity)

32

|SW3)|

Same

as

step

16.

Exactly

13MC.

(400%,

|

13MC

Same

as

step

l.

L4

30%,

AM

modulated.)

33

|

SW3)|

Same

as

step

16.

Exactly

13MC.

(400%,

|

13MC

Same

as

step

l.

L17

30%,

AM

modulated.)

|

ee

ee

eee

eae

4

Signal

generator

Receiver

30%,

FM

modulated.)

Adjust

Step

|

Band|

Connection

to

receiver

|

Input

signal

frequency

Dial

setting

Remarks

34

|SW3!

Same

as

step

16.

Exactly

23MC.

(400%,

|

23MC

Same

as

step

1.

C12

30%,

AM

modulated.)

35

|SW3)]

Same

as

step

16.

Exactly

23MC.

(400%,

|

23MC

Same

as

step

1.

C22

30%,

AM

modulated.)

36

[sw3

Repeat

steps

30,

31,

32,

33,

34

and

35

until

no

further

improvement

is

obtained.

37

|

MW

|

Same

as

step

2.

600KC

(unmodulated)

600KC

Adjust

for

L18

maximum

beat.

FM

Alignment

Signal

generator

Receiver

|

Adjust

Step

|

Band|

Connection

to

receiver

Input

signal

frequency

Dial

setting

Remarks

|

1

|

FM

|

Connect

signal

generator

|

Exactly

10.7MC.

(400%,

|

Tuning

gang’fully

|

Connect

a

0.04mfd

|

T-7

through

a

5pF

capacitor

|

30%,

AM

modulated.)

closed.

condenser

between

|

T-5,

T-3

to

FM

mixer

emitter,

(maximum

capacity)|

chassis

ground

and

|

T-4

test

point

1,

of

Q6.

to

Q9

collector,

|

For

maximum

Ground

lead

to

the

rece-

test

point

5.

Con-

|

indication.

iver

chassis.

nect

AC

millivolt

meter

between

TP8

and

chassis

ground.

2

|

FM/|

Same

as

step

1.

Exactly

10.7MC.

Same

as

step

1.

Remove

0.04

mfd.

|

T-9

(Unmodulated)

condenser,

follow

NOTE

B.

3

|

FM

|

Connect

signal

generator

|

Exactly

86MC.

(400%,

|

Tuning

gang

fully

|

Adjust

for

the

|

L11

through

a

1000

resistor,

|

30%,

FM

modulated.)

closed.

maximum

indica-

including

output

imped-

(maximum

capacity)]

tion

on

the

output

ance

of

signal

generator

meter

connected

to

the

external

antenna

|

across

the

voice

jack,

coil

lugs.

Ground

lead

to

the

rece-

|

iver

chassis.

4

|

FM

|

Same

as

step

3.

|

Exactly

110MC.

(400%,

|

Tuning

gang

fully

|

Same

as

step

3.

C24

|

30%,

FM

modulated.)

open.

|

|

|

(minimum

capacity)

5

|

FM|

Same

as

step

3.

Exactly

88MC.

(400%,

|

88MC

Same

as

step

3.

L5

30%,

FAM

modulated).

6

|

FM

|

Same

as

step

3,

Exactly

88MC.

(400%,

|

88MC

Same

as

step

3.

L12

30%,

FM

modulated.)

7

|

FM

|

Same

as

step

3.

Exactly

108MC.

(400%,

|

108MC

Same

as

step

3.

C23

30%,

FM

modulated.)

8

FM

|

Same

as

step

3.

Exactly

108MC.

(400%,

|

108MC

Same

as

step

3.

C25

9

FM

|

Repeat

steps

3,

4,

5,

6,

7

and

8

until

no

further

improvement

is

obtained.

CAR

ANT.

ADJUSTMENT

(AM

Alignment)

Signal

generator

Receiver

Adjust

Step

Band

Connection

to

receiver

|

Input

signal

frequency

Dial

setting

|

Remarks

1

|

MW|

The

S6

should

be

switch-

|

Exactly

600KC.

(400%,

|

600KC

Adjust

for

maxi-

|

L28

ed

over

to

Car

Antenna

|

30%,

AM

modulated.)

mum

output

on

and

connect

signal

gene-

the

output

meter

rator

through

the

Car

connected

to

the

|

Antenna

dummy

(See

|

speaker

voice

coil

NOTE

C)

to

the

Car

lugs.

Antenna

jack.

2

|

MW|

Same

as

step

1.

Exactly

1400KC.

(400%,

|

1400KC

Same

as

step

l.

C120

30%,

AM

modulated.)

3

|

MW

|

Repeat

steps

1

and

2

until

no

further

improvement

is

obtained.

4

|

LW

|

Same

as

step

1.

Exactly

180KC.

(400%,

|

180KC

Same

as

step

l.

L27

30%,

AM

modulated.)

|

cea

ah

Nig

Ss

Same

as

step

1.

Exactly

350KC.

(400%,

|

350KC

Same

as

step

l.

C118

30%,

AM

modulated.)

o1

LW

6

|

LW

|

Repeat

steps

4

and

5

until

no

further

improvement

is

obtained.

NOTE

A.

Check

alignment

of

receiver

antenna

coil

by

bringing

a

piece

of

ferrite

(such

as

a

coil

slug)

near

the

antenna

loop

stick,

then

a

piece

of

brass.

If

ferrite

increases

output,

loop

requires

more

inductance,

change

loop

inductance

by

sliding

the

bobbin

toward

the

center

of

ferrite

core

to

increase,

or

way

to

decrease

inductance.

B.

1)

Connect

VTVM

(0.1

volts

range

DC

scale)

between

test

point

10

and

chassis

ground.

Set

VTVM

zero

volt

center.

2)

Adjust

discriminator

secondary.

core

(orange)

for

0

volt

on

VIVM.

3)

Change

signal

generator

frequency

10.7MC+100KC

and

—100KC

approximately.

4)

Adjust

discriminator

primary

Core

(green)

for

balanced

peaks.

Peak

separation

should

be

approximately

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