Sharp FV-1800 Manuale utente

Service

Manual

Gagua

MODEL

FV-1800

SPECIFICATIONS

TRANSISTOR

COMPLEMENT

Frequency

Range:

150~370

kHz

2SA234

®)

Oscillator

520~1620

kHz

2SA234

Amplifier

SW1

1.6~4.3

MHz

2SA234

Mixer

SW2

3.9~12.0

MHz

2SK19

Amplifier

SW3

12.0~26.5

MHz

28C535

Mixer

88&~108

MHz

28C461

Oscillator

Intermediate

Frequency

2SA234

®)

Ist

Amplifier

455

kHz

28A234

2nd

Amplifier

10.7

MHz

=2SA234

3rd

Amplifier

Power

Supply

12V

(UML

battery

Q10

2SA12

BFO

100~120,

200~240V

50/60Hz

Qll

2S8C458

Audio

Amplifier

Power

Output

Undistorted

Ql2

28C458

Audio

Amplifier

Maximum

3.5W

Q13

2SB75

Audio

Driver

Speaker

3-1/2"

4”

(9cem

10cm)

Oval

Ql4

2SB370

Audio

Output

P.D.S.

V.C.

imp.

ohms

Q15

=2SB370

Audio

Output

Dimensions

35cm

CW)

23.8cm

(H)x14cm

(D)

Q1i6

25C830

Power

Stabilizer

(13-3/4"

9-3/8"

5-1/2")

Q17

28C458

Power

Stabilizer

Weight

5.5

(121ds)

without

batteries

SHARP

CORPORATION

osaka,

sapan

GENERAL

DESCRIPTION

The

circuit

used

this

band

portable

radio

incorporates

transistors

diodes

and

thermistors.

ferrite

bar

antenna

feeds

the

broadcasting

signal

the

mixer

and

telescopic

rod

antenna

feeds

the

broadcasting

signal

the

mixer,

amplifiers

and

diode

detector.

telescopic

rod

antenna

feeds

the

broadcasting

signal

the

amplifier,

mixer,

amplifier

and

detector

diodes).

The

audio

signal

passes

through

transistor

audio

amplifier

circuit.

AVC

voltage

fed

back

the

1st

amplifier.

AVC

voltage

fed

back

the

amplifier.

AFC

voltage

fed

back

the

converter.

—

AM_

SECTION

ma,

TUNER

SECTION,

SAM,

SECTION

ang

EXT_

ANT.

;

AMP

MIX

Ist

AMP

2nd

AMP

3rd

AMP

EM_DET

ie]

PETI

IFT

Eto

DET

LOO)

()

IND.

OUT

IN34,

OY”

IND.

ARTH

site

METER

ven

iad

—

Rec

Peay

~7——

——""

"AUIS

AMP

SECTION

i—&)—?

VOLUME

TONE

OUTEUT

SWI

aux

IN.

LPT.

AMP

AF.

AMP

DRIVE

SPEAKER

aed

ANT.

COIL

[

car|

{

swt

[sv]

AMx!

;

()

[om

IN34A,

cSUONING)

gs)

““——"""]\

TUNER

SECTION

“"———~""BowER

SOUCE

SECTION

Figure

BLOCK

DIAGRAM

CHASSIS

REMOVAL

(Refer

Figure

Remove

the

six

control

knobs

(A)

the

front

panel.

Take

off

the

battery

cover.

Loosen

the

five

screws

(B)

the

back

the

set.

Fasten

the

terminal

compartment

cover.

Remove

the

antenna

cord

(C),

indicator

cord

(D),

battery

cord

(E)

and

speaker

cord

(F).

Loosen

the

five

chassis

retaining

screws

(G).

Gently

pull

out

the

chassis

toward

you.

When

assembling,

reverse

the

order.

Figure

CHASSIS

REMOVAL

GENERAL

ALIGNMENT

INSTRUCTIONS

Should

become

necesary

any

time

check

the

alignment

this

receiver,

proceed

follows;

Connect

output

meter

across

the

speaker

voice

coil

lugs.

Set

the

volume

control

for

maximum.

Attenuate

the

signals

from

the

generator

enough

swing

the

most

sensitive

range

the

output

meter.

Use

non-metallic

alignment

tool.

Repeat

adjustments

insure

good

results.

ALIGNMENT

CHART

Signal

generator

Receiver

Step

Band

Connection

receiver

Input

signal

frequency

Dial

setting

Remarks

Adjustment

Connect

signal

generator

through

10K

ohm

dummy

the

antenna

tuning

con-

denser.

Ground

lead

the

receiver

chassis.

Use

radiation

loop.

Loop

several

turns

wire,

place

generator

lead

receiver

for

adequate

signal

pickup.

Generator

output

one

end

this

wire.

Exactly

455kHz

(400Hz,

30%,

modulated)

Tuning

gang

fully

open.

(minimum

capacity)

Adjust

for

maximum

output

speaker

voice

coil

lugs.

T10

Exactly

600kHz

(400Hz,

30%,

modulated)

Adjust

the

oscil-

lator

core

(L7),

and

then

adjust

the

antenna

coil

(L14,

L1).

(See

NOTE

Repeat

steps

and

until

Same

step

Exactly

1400kHz

(400Hz,

30%,

modulated)

1400kHz

Adjust

the

oscil-

lator

trimmer

(C16),

and

then

adjust

the

antenna

trimmer

(C201,

C21).

(See

NOTE

further

improvement

can

made.

Same

step

Exactly

180kHz

(400Hz,

“30%,

modulated)

180kHz

Same

step

Exactly

350kHz

(400Hz,

30%,

modulated)

Repeat

steps

and

until

further

improvement

can

350kHz

made.

swl

Same

step

Exactly

1.7MHz

(400Hz,

30%,

modulated)

Same

step

Exactly

3.7MHz

(400Hz,

30%,

modulated)

1.7MHz

Adjust

the

oscil-

lator

core

(L6),

and

then

adjust

the

antenna

coil

(L13,

L1).

(See

NOTE

Adjust

the

oscil-

lator

trimmer

(C17),

and

then

adjust

the

antenna

trimmer

(C22,

C202).

(See

NOTE

Adjust

the

SW1

oscil-

lator

core

(L8),

and

then

adjust

the

SW1

antenna

core

(L2,

L15).

Repeat

steps

and

until

further

improvement

can

made.

Adjust

the

SW1

oscil-

lator

trimmer

(C15),

and

then

adjust

the

SW1

antenna

trimmer

(C20,

C12).

Signal

generator

Receiver

Adjustment

NOTE

Step

Band

Connection

receiver

Input

signal

frequency

Dial

setting

Remarks

SW2/!

Same

step

Exactly

4.5MHz

(400Hz,

4.5MHz

Same

step

Adjust

the

SW2

oscil-

30%,

modulated.)

lator

core

(L9),

and

then

adjust

the

SW2

antenna

core

(L16,

L3).

'sw2

Same

step

Exactly

10MHz

(400Hz,

10MHz

Same

step

Adjust

the

SW2

oscil-

30%,

modulated.)

lator

trimmer

(C14),

and

then

adjust

the

SW2

antenna

trimmer

(C19,

C11).

SW2/|

Repeat

steps

and

until

further

improvement

can

made.

|SW3

Same

step

Exactly

13MHz.

(400Hz,

13MHz

Same

step

Adjust

the

SW3

oscil-

30%,

modulated.)

lator

core

(L10),

and

then

adjust

the

SW3

antenna

core

(L17,

L4).

|SW3

Same

step

Exactly

23MHz

(400Hz,

23MHz

Same

step

Adjust

the

SW3

oscil-

30%,

modulated.)

lator

trimmer

(C13),

and

then

adjust

the

SW3

antenna

trimmer

(C18,

C10).

Repeat

steps

and

until

further

improvement

can

made.

Check

the

alignment

the

receiver

antenna

coil

bringing

piece

ferrite

(such

coil

slug)

near

the

antenna

loop

stick,

then

piece

brass.

ferrite

increases

output,

loop

requires

inductance.

brass

increases

output,

Change

loop

inductance

sliding

the

bobbin

toward

the

center

ferrite

core

increase

inductance,

ALIGNMENT

CHART

Signal

generator

Receiver

Step

Connection

receiver

Input

signal

frequency

Dial

setting

Remarks

loop

requires

less

inductance.

away

decrease

inductance.

Adjustment

Connect

signal

generator

Exactly

10.7MHz

(400Hz,

Tuning

gang

fully

Connect

VTVM

be-

Detune

T12

and

T13

through

5PF

dummy

test

30%,

modulated)

closed.

tween

test

point

Tune

T9,

T7,

T5,

and

point

TP-1.

Generator

ground

(maximum

capacity)

TP-6

and

chassis

for

maximum

indica-

lead

the

receiver

chassis.

ground.

tion.

Same

step

Exactly

10.7MHz

Same

step

See

NOTE

See

NOTE

Cunmodulated)

Connect

signal

generator

Exactly

88MHz

(400Hz,

88MHz

Adjust

for

maxi-

Adjust

the

oscillator

through

ohm

resistor

in-

30%,

modulated)

mum

output

coil

(L12),

and

then

cluding

output

impedance

speaker

voice

coil

adjust

the

coil

signal

generator

the

tele-

lugs.

CELL,

L5):

scopic

rod

antenna.

Ground

lead

the

receiver

chassis.

Same

step

Exactly

108MHz

(400Hz,

108MHz

Same

step

Adjust

the

oscillator

30%,

modulated)

trimmer

(C9),

and

then

adjust

the

trim-

mer

(C8,

C7).

Repeat

steps

and

until

further

improvement

can

made.

sss

NOTE

Connect

VIVM

(0.1

volt

range

scale)

between

test

point

TP-3

and

chassis

ground.

Adjust

T13

for

volt.

'3)

Change

signal

generator

frequency

10.7MHz+100kHz

and

—100kHz

approx.

Peak

separation

should

approx.

200kHz.

Adjust

T12

for

balanced

peaks.

CAR

ANT.

ADJUSTMENT

(In

case

car

use,

set

the

switch

(SW6)

“Car

(2)”

position.)

Signal

generator

Receiver

Adjustment

Step

Band

Connection

receiver

Input

signal

frequency

Dial

setting

Remarks

Use

radiation

loop.

Loop|

Exactly

600kHz.

(400Hz

600kHz

Adjust

for

maxi-

Adjust

the

an-

several

turns

wire,

30%,

modulated.)

mum

output

tenna

coil

(L14,

L202).

place

generator

lead

speaker

voice

coil

(See

NOTE

receiver

for

adequate

lugs.

signal

pickup.

Connect

generator

output

one

end

this

wire.

MW|

Same

step

Exactly

1400kHz.

(400Hz,

1400kHz

Same

step

Adjust

the

an-

30%,

modulated.)

tenna

trimmer

(C21,

C203).

(See

NOTE

MW|

Repeat

steps

and

until

further

improvement

can

made.

Same

step

Exactly

180kHz.

(400Hz

180kHz

Same

step

Adjust

the

an-

30%,

modulated.)

tenna

cail

(L13,

L201).

(See

NOTE

Same

step

Exactly

350kHz

(400Hz,

350kHz

Same

step

Adjust

the

an-

30%,

modulated.)

tenna

trimmer

(C22,

C204).

(See

NOTE

LW]

Repeat

steps

and

until

further

improvement

can

made.

I5pfd

65pfd

CAR

ANT.

JACK

80—R’)

R’=

out

put

impedance

signal

generator

SIGNAL

GENERATOR

CAR

ANT.

DUMMY

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