Sharp DV-1600 Series Manuel utilisateur

SHARP

SERVICE

MANUAL

TVSMY82397XV

CONTENTS

Page

ELECTRICAL SPECIFICATIONS ..............

IMPORTANT SERVICE NOTES ...............

ADJUSTMENT

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

CHASSIS LAYOUT DIAGRAM ...............

PRINTED WIRING BOARD ASSEMBLIES. .......

BLOCK DIAGRAM .......................

+B POWER SCHEMATIC DIAGRAM ............

SCHEMATIC DIAGRAMS AND WAVEFORMS .....

REPLACEMENT PARTS LIST ..............

PAL

SYSTEM

COLOUR TELEVISION

ELECTRICAL SPECIFICATION

Aerial Input Impedance

..........

75 ohm unbalanced

Convergence

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

Self Converging System

Focus

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

Quodra Potential Focus

Audio Power Output Rating

.........

.2.0

Watt (max.)

Intermediate Frequencies

Picture IF Carrier Frequency

.........36.875 MHz

Sound IF Carrier Frequency

..........31.375 MHz

Colour Sub-Carrier Frequency

.........32.445 MHz

Power Input

.................240 Volts AC 50Hz

Power Consumption

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

72 Watt

Speaker Size,

Voice Coil Impedance

......

cm (16 ohms at 400 Hz)

Sweep Deflection

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

Magnetic

Tuning Ranges

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

VHF-Channels 0 thru 12

UHF-Channels 28 thru 63

WARNING

The

chassis

this

receiver

hot.

Use

isolation

transformer

between

the

line

cord

plug

and

power

receptacle,

when

servicing

this

chassis.

prevent

electric

shock,

not

remove

cover.

user

personnel. serviceable

parts

inside.

Refer

servicing

qualified

service

SHARP

CORPORATING

AUSTRALIA

PTY.

LTD.

64-72 SEVILLE ST.

FAIRFIELD, 2165

N.S.W.

TEL: 02-728-9111

IMPORTANT

SERVICE

NOTES

Maintenance and repair of this

reoeiver

should be done by

qualified service personnel only.

SERVICING OF HIGH VOLTAGE SYSTEM AND

PICTURE TUBE

When servicing the high voltage system, remove static

charge from it by

co~ecting

1Ok

ohm Resistor in series

with an insulated wire (such as a test probe) between

picture tube dag and 2nd anode lead. (AC line cord should

be disconnected from AC outlet.)

1. Picture tube in this receiver employs integral implosion

protection.

2. Replace with tube of the same type number for continu-

ed safety.

3. Do not lift picture tube by the neck.

4. Handle the picture tube only when wearing shatter-proof

goggles and after discharging the high voltage

corn-

pletely.

X-RAY

This receiver is designed so that any X-ray radiation is kept

to an absolute minimum. Since certain malfunctions or

servicing may. produce potentially hazardous radiation

with prolonged exposure at dose range, the following pre-

cautions should be observed:

1. When repairing the circuit, be sure not to increase the

high

voltage

than

27kV,

(at

beam

1000pA)

for

the

set.

keep

the

set

normal

operation,

sure

make

function

23.5

1SkV

(at

beam

1OOOpA)

the

case of the set. The set has been factory

adjusted to

the above-mentioned high voltage.

. .

If there is a possibility that the high voltage fluctuates

as a result of the repairs, never forget to check for

such high voltage after the work.

3. Do not substitute a picture tube with unauthorized

types and/or brands which may muse excess X-ray

radiation.

BEFORE RETURNING THE RECEIVER

Before returning the receiver to the user, perform the

following safety checks.

1. Inspect all lead dress to make certain that leads are not

pinched or that hardware is not lodged between the

dmsis

and other metal parts in the receiver.

2. Inspect all protective devices such as non-metallic con-

trol knobs, insulating fishpapers, cabinet backs, adjust-

ment and compartment covers or shields, isolation

resistorcapacity networks, mechanical insulators etc.

Step

Adjust point

Tuner IFT coil:

ADJUSTMENT

PIF/AFT/SIF

ADJUSTMENT

Connection

(1)

Receive

ch.

signal.

(If

reception

ch.

signal

not

satisfied,

receive

VIII band

signal

instead

(2) Connect

sweep

generator to the

tuner’s

test

point.

(Use

ohm

cut probe.)

To sweep

generator

OOOpF

Figure 1.

Sweep

output

level:

Note:

The

sweep

generator’s

earth

lead

must

grounded near

the test point.

(3)

Connect

reponse

lead

(low

impedance probe with detector)

TP201

(collector

Q201).

To oscil-

Figure 3.

68f2

(4)

Voltage

setting

PIF

AGC:

Apply

3.9V

PIF

(X201).

(5)

Voltage

setting

AGC:

Apply

to tuner

AGC.

(6)

Short

TP601

and

TP602

(to

stop

sync

separator circuit).

Procedure

(1)

Adjust the tuner IF

coil

have

the

waveform

shown

Fig.

P4.43MHz

36.875MHz

Figure 2.

*Picture

signal

and

carrier

signal

must

have

the

same

level.

Step

Adjust point Connection Procedure

36.875

MHz

carrier (1)

Connect

signal

generator

(1)

Adjust

T204

that

voltage

TP203

filter:

PIF

(IC201).

minimum.

T204

Generator’s

output

level:

l At the end

adjustment,

see

that

there

non modulation (36.875

MHZ)

appears

TP203.

(2)

Connect

VTVM

oscilloscope

not,

readjust from the beginning.

(DC

range)

TP203.

(3)

Voltage

setting

PIF

AGC:

Apply

voltage

(about

S.OV)

pin@

PIF

(IC201).

Note:

The

applied

voltage

should not

exceed

7.OV.

AFT rough adjust:

(1)

Connect

sweep

generator

(1)

Adjust

T203

that

the

depressed

point

T203 pin

PIF

(IC201).

waveform

at 36.875

MHz

shown in

Fig.

OlOOp

Generator’s output level: 90dB

Figure 4.

36.875MHz

(2)

Connect

response

lead

TP203.

36.875MHz

To oscil-

loscope

OkS2

-=f-+Yl!F~

Figure 6.

Figure 5.

(3)

Short

TP601

and

TP602.

(4)

Voltage

setting

PIF

AGC:

Adjust

voltage

(about

S.OV)

PIF

(IC201)

and

adjust

have

Vp-p

waveform

oscilloscope.

Note:

The

applied

voltage

should not

exceed

7V.

Step

Adjust

.point

Connection Procedure

4. Overall

waveform

(1)

Receive

loch.

signal.

(1)

Check

that

overallwaveform

shown

reception

ch.

Signal

Fig.

not

satisfied,

receive

VIII

band

signal

instead.

(2)

Connect

sweep

generator to

tuner’s

test point.

(Use

initial

stage

detecting probe.)

Generator’s

output

level:

(3)

Connect

response

lead

TP203.

P-36.875MHz

(Use

10k

ohm direct

probe

having

been

used

AFT

rough

adjustment

(4)

Voltage

setting

AGC:

Apply

tuner

AGC.

AGC:

about

-20

(5)

Short

TP601

and

TP602

(to

stop

sync

separator circuit).

Figure 7.

(6)

Connect

120

ohm

damping

resistor between

pins

and

IC201.

Note:Damping

resistor

leads

should

’

short

possible.

;

(7)

adjustment

PIF

AGC:

Connect

voltage

(about

5V)

pin 13

IC201

and

adjust

that

waveform

TP203

Vp-p.

AFT

fine

adjust:

(1)

Receive

standard

PAL

colour bar

T203 signal.

Input intensity:

Over

(2)

Connect

oscilloscope

TP203.

Oscilloscope

range:

O.SV/div.

Sweeing

time

20psec/div.

Sync

operation: Horizontal

(3)

Connect

signal

generator’s

output

TP201.

Generator’s

output

level:

Zero beating

About

dB.

Generator’s

output

frequency:

36.875

MHz

kHz

StiDi

TP201

0201

Figure 9.

--1

t--F

1PF

CF2Ol

T2b-;

’

To signal generator

Figure 8.

(4)

Open

tuning control door

(lid),

then

AFT

switch

will

turn

off

automatically.

(5)

Adjust tuning control

to’have

zero

beating on

oscilloscope

shown

Fig.

Step

Adjust point Connection Procedure

(6)

tuning control door (lid),

’

then AFT switch

will

turn

automatically.

(7)

Adjust

T203

have

zero

beating

oscilloscope

shown

Fig.

11.

Adjustment error:

36.875

MHz

kHz

AGC

cut-in:

(1)

Receive

standard colour

bar

signal.

R209

reception

colour

bar

signal

not possible,

receive

VIII band

signal

instead.

Input

intensity:

Within

(2)

Connect

oscilloscope

TP203.

Oscilloscope

range:

0.2V/div.

Sweeping

time: 20psec/div.

Sync

operation: Horizontal

(3)

Turn R209 until there

appears

noise

oscilloscope

shown

Fig.

10.

(4)

urn back R209 slowly until

there

disappears

noise

oscil-

loscope. At the time, horizontal

sync

signal

should keep on the

same

level

before.

(Fig.

11)

keep on this level.

(5)

Set

signal

intensity at

dB,

and

see

that

there

black

letter

and

sound beating

oscilloscope.

(6)

Set

signal

intensity

dB,

and

see

that there

Figure 11.

noise

oscilloscope.

SIF

detection

coil:

(1)

Voltage

setting

PIF

AGC: (1)

Adjust

T301

that

signal

(400

Hz)

T301

Apply

oscilloscope

becomes minimum.

IC20

(2)

Adjust sound

volume

maximum.

(3)

Connect

signal

generator’s

output

$!J

IC201.

400Hz

(AM signal)

Figure 13.

Figure 12.

Zero

AM signal

l Frequency:

5.5

MHz

l Modulation:

400

Hz,

30%

Figure 14.

Generator’s

output

level:

Step

Adjust point Connection Procedure

(4)

Connect

oscilloscope

IC201.

Oscilloscope

range:

mV/div.

Sub-sound

adjust:

(1)

Receive

PAL colour bar

signal (1)

Adjust

R302

have

1.0

Vp-p

waveform

R1022

(sound modulation 400

Hz,

100%).

oscilloscope

shown

Fig.

15.

(2) Connect

oscilloscope

connec-

tor

sub-sound control

(R302).

(3) Adjust

R302

have

1.0

Vp-p

waveform (400

Hz)

oscilloscope.

(4)

Obtain

normal sound

the

l.o{’

following

way

Figure 15.

Turn

off

the power switch first

and then turn

again,

and

(2)

Adjust R1022

that

output

voltage

turn

the remote control

speaker

Vp-p.

transmitter;

then

normal

sound

obtained.

(5)

Connect

oscilloscope

both

ends

speaker.

(6)

Adjust

R1022

(sub-sound

.ovp-p

control

sensor

PWB)

that

output

voltage

speaker

1.0

vp-p.

Figure 16.

VIDEO CHROMA ADJUSTMENT

Step

Adjust point Connection Procedure

CRT

cut-off

adjust:

eceive

monoscope pattern

R853

;

R-bias

(OR

(1)

Turn

screen

control

clockwise

slowly until

signal.

R859;

G-bias

the horizontal

raster

appears

slightly,

and

(Instead

monoscope pattern stop it.

R865;

B-bias

signal,

allowed

use

black/

Screen

control

(2)

One

the three colours (R,

and

white pattern

signal.) appears

first

screen

control

turned.

(2)

Set

R857

(G-drive)

and

R863 So,

touching

off

the

bias

control

belonging

(B-drive)

CENTER

position.

the first colour,

use

and

move

the other

Set

R853

(R-bias),

R859

(G-bias)

two

bias

controls

clockwise

until the raster

and

R865.

(B-bias)

MIN

becomes white.

position. Note:

careful not

cause

the raster

(3)

Set

screen

control

MIN

appear

too

brightly;

there

will

position. fear

CRT

burning.

(4)

Short

TP403

and

TP404. (3)

Turn

screen

control counter-clockwise

(5)

Short

TP401

and

TP402,

then

until

the raster

disappears,

and stop it.

raster

will

appear

CRT.

White

balance/

(1)

Receive

monoscope pattern

(1)

Adjust R857 and

R863

let the colour

background adjust:

signal.

temperature (white)

at 6500°K.

R85

G-drive (2)

Set

contrast control at

MAX

(2)

Adjust contrast

and

brightness controls

R863

;

B-drive

position.

that

beam

current

350pA, then

see

that

(3)

Set

brightness control

MAX

1colour temperature (background)

still

position. at 6500°K.

not,

readjust from the

(4)

Connect

beam

arnmeter

beginning.

TP603

and

TP604.

(5)

Adjust

R406

(sub-contrast)

that

beam

current

l.OmA.

Sub-contrast adjust:

(1)

Receive

monoscope pattern

signal (1)

Adjust

R406

that

beam

current

R406 (Instead

monoscope pattern

.OmA.

signal,

allowed

use

white

pattern

signal

88%

modulation.)

(2)

Set

contrast control at

MAX

position.

(3)

Set

brightness

control at

MAX

position.

’

(4)

Connect

beam

ammeter to

TP603

and

TP604.

Ammeter setting:

Full

scale

3mA

Connection

ammeter:

side

TP604,

and

side

TP603.

Chroma

(1)

onnect pattern generator

(PM5508)

the

receiver:

the

antenna input

about

dB.

(2)

Set

contrast

and

brightness

controls at

MAX

position, and

colour control at

CENTER

position.

(1)

Receive

“matrix”

pattern

signal.

(2)

Adjust

T882

that

the brightness won’t

vary with

every

change

scanning

line.

(3)

Receive

“delay”

pattern

signal.

(4)

Adjust

R805

that the

brightness

won’t

vary with every

change

scanning

line.

(5)

Receive

“phase” pattern

signal,

and

adjust

T801

that

the

same

tone

will

obtained for

both

upper

and

lower

halves

screen.

Step

Adjust

point

Pulse

width

adjustment:

R1063

Connection

(1)

Receive

standard

PAL

crosshatch

pattern

signal.

(2) Connect synchroscope to

TPlOOl.

(1)

Adjust

R1063

obtain the

pulse

width

msec.

I-

20ms

Figure

17.

Procedure

SYNC/DEFLECTION ADJUSTMENT

Adjust

point

Connection

H-freq.

adjust:

R607 (1)

Receive

monoscope pattern

signal.

(2)

Short

TP601

and

TP602.

V-hold

adjust:

R504

’

(1)

Receive

monoscope pattern

signal.

H-size

tip (1)

Receive

monoscope pattern

signal.

V-size

adjust

(1)R

eceive

monoscope pattern

R510

signal.

V-linearity adjust:

R509

Vcentering adjust:

(1)

Receive

monoscope pattern

SW501

signal.

Hcentering

adjust:

SW60

Procedure

(1)

Adjust

R607

for good horizontal

sync.

Figure 18.

(1)

Adjust R504

that

vertical

sync

will

proper.

(1)

Arrange

the position

H-size

tip

have

H-size

(12%

max.)

overscanning.

(1)

Adjust

and

R509

time

for

good

V-linearity.

size

should

(12%

max.)

overscanning.

(1)

Adjust

SW501

that

V-center

picture

the geometrical center

CRT.

(2)

Adjust

SW601

that

H-center

picture

the geometrical center

CRT.

Geometrical

center

I’

-+--

Figure 19.

CRT ADJUSTMENT

Step

Adjust point Connection Procedure

Focus control

(1)

Receive

monoscope pattern

signal.

(1)

Adjust focus control

have

best focus

at the central

area

CRT.

(2)

Set

contrast control at

MAX

’

position.

(3)

Set

brightness

control

MAX

position (with

.OmA

beam

current).

(Instead

monoscope pattern

Purity magnet

signal,

allowed

use

white

pattern

signal

88%

modulation.)

(1)

Receive

monoscope pattern

signal,

Figure 20.

(2)

Degauss

CRT

shadow

mask

with

degaussing

coil.

(3)

Prior

to the adjustment, operate

the

receiver

for

than

(4)

~~~~ty

magnets

the

horizontal position.

(5)

Bring

deflection yoke

near

purity

magnet

possible.

(6)

Set

R853

(R-bias)

and

R865.

(B-bias)

MIN

position, then

turn

R859

(G-bias)

until

green

raster

appears.

Green

Figure 21.

(7)

Adjust

purity

magnets for

uniform

green

vertical

band

the center

CRT

screen.

For

this

adjustment, motion

each

magnet should

slight

possible.

(8)

Shift deflection yoke toward

CRT

achieve

uniform

green

purity

the

entire

CRT

screen.

(9)

Perform white

balance

opera-

tion,

and

see

white

balance

picture

normal.

’

Convergence

(1)

Receive

crosshatch pattern Static (center)

convergence:

signal.

(2)

Set

contrast control at

(1)

Rotate

4-pole

magnet to

converge

red

and

blue

lines.

CENTER

position.

(3)

Set

brightness

control

(2)

After completing

red

and

blue

center

convergence,

rotate

6-pole

magnet

CENTER

position.

;ly

converge

the

red

and

blue

and

green

lines.

namic

convergence:

(3)

Convergence

the three colour

fields

the

edges

CRT

screen

accomplished

by positioning

deflection yoke tilt

adjustment

wedges.

(4)

After the adjustment,

secure

deflection

yoke with

wedges.

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