Sharp sx51b8 schematic

SHARP

SERVICE MANUAL

$X319$X51 8811

PAL SYSTEM

COLOUR TELEVISION

Chassis No. 216

In the

interests of

restored to

its

user-safety (Required by safety regulations in some countries) the set

original condition and only parts identical to those specified should be used.

FEATURE

n

One Chip Microprocessor Voltage Synthesizer

System

l

39 Channels Programming System

l

Channel

l

Last (ChannelNolume/Power/DAC) Memory

System

n

Ful I

w Automatic Fine

n

21 InchesTint CRT

n

Direct

w One-Touch ON/OFF Timer

n

AV

,

. ELECTRICAL SPECIFICATIONS .

IMPORTANT

. SERVICE ADJUSTMENT

(Refer to SX-51 B7 Service Manual)

.

TROUBLE

(Refer to SX-51 B7 Service Manual)

l SOLID STATE DEVICE BASE DIAGRAM . . . . .

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

. PRINTED WIRING BOARD ASSEMBLIES . . . .

Skip

Preset System

Auto

Channel Preset System

Tuning

Access

Input

Remote Control

Terminal

SERVICE NOTES . . . . . . . . . . . . .

SHOOTING TABLE

System (AFT System)

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

MODELS

n

(at A/V Input)

H

Blue Back Off-Timer

H Flash Back

n

(I.G.R.-Stereo, Bilingual)

H Sound Surround System

(Movie, Music, Mono-Wide)

n

The equipped

CONTENTS

Page

2 2

7 3 5

. DESCRIPTION OF SCHEMATIC DIAGRAM . .

. SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . .

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

. REPLACEMENT

sx-51 B8

NTSC 3.58/4.43 MHz Play

Multiplex

TELETEXT

SX-51B8 is a sister

Sound System

with

the

AN-224TX

PARTS

Back System

model

(TELETEXT unit).

LIST

should

of

SX-51 B7 and

. . . . . . . . . . . . -

Page

.

be

is

8

9 15 17

c

WARNING

The chassis in this receiver is partially hot. Use an isolation transformer between the line cord plug and

power receptacle, when servicing this chassis. To prevent electric shock, do not remove cover. No user qualified service personnel.

-

serviceable parts inside. Refer servicing to

SHARP CORPORATION

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CHASSIS LAYOUT

s I003

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sx-51 B8

[-&]

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NOTE:

The

PWB-F

TELETEXT Unit is discussed in the Model AN-224TX Service Manual.

I

7

I

8

I

9

I

10

I

11

I

12 I

4

sx-51 B8

I

PRINTED WIRING BOARD ASSEMBLIES

(All the

H

G

F

PWBs

here are shown as viewed from their wiring sides)

E

D

C

B

A

PWB-A Mother Unit

-

1

I

2

I

3

I

4

I

5

I

6

5

sx-51 B8

I

PWB-B CRT Socket Unit

uui

PWB-C AV Unit

NOTE:

PWB-E IGR Unit

PWB-H LED Unit

The

WEEF

TELETEXT Unit is discussed

in the Model AN-224TX Service Manual.

7

I

8

I

9

I

10

I

11 I

12

3

6

sx-51 B8

I

SOLID STATE DEVICE BASE DIAGRAM

TOP VIEW

8-S

ELII

l-4

NM93C46

16 -

a

1

-8

TDA466 1

SIDE

2SA1015 2SC1815 2SC1906 2SC383 2sc945

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VIEW

2SC2236 2SC227 1

?,,,,,,,, J

1

MPC1891

16

-

““““““”

1

-8

ix1

779CE

10

9

52

1

TDA8362

64

1

ix1

830CE

27

26

33

32

L BASE

COLLECTOR COLLECTOR

1’

EMITTER

0

0 0

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B C E

2SD2095

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B C E

2SD 1884

0

~

L

8ASE

L

COLLECTOR

1

EMITTER

2SD880

L BASE

EMITTER

123

UPC78M05

PX0291CE

ANODE

(RED)

CATHODE AdgEFMW

(GREEN)

0

0 0

I

~

123

TA78085

1

TA7347P

1

M51523AL

l-7

iX0640CE

7

14

1

TA7348P

1

iX0257CE

-~-~--------”

1

TDA7057Q

9

7

SX-51B8

DESCRIPTION OF SCHEMATIC DIAGRAM

1

CAUTION: This circuit diagram is original one, therefore there may be a slight difference from yours.

I

SAFETY NOTE:

1.

DISCONNECT THE AC PLUG FROM THE AC OUTLET BEFORE

REPLACE/NC PARTS.

2. SEMICONDUCTOR HEAT SINKS SHOULD BE REGARDED AS POTENTIAL SHOCK HAZARDS WHEN THE CHASSIS OPERATING.

15

IMPORTANT SAFETY NOTICE:

PARTS MARKED IMPORTANT FOR MAINTAINING THE SAFETY OF THE SET. SURE TO REPLACE THESE PARTS MAINTAINING THE SAFETYAND PERFORMANCE OF THE SET.

WlTH =A’ (

WlTH

SPECIFIED ONES FOR

) ARE

BE

NOTES:

1.

The unit of resistance “ohm ” is omitted.

(K = 1000 ohms,

2. All resistors are

3. All capacitors are

P

=

PPUF).

4. The diodes, whose parts code is not described, are the

lSSll9.

M = Meg ohm).

118

watt, unless otherwise noted.

FF,

unless otherwise noted.

VOLTAGE MEASUREMENT CONDITIONS:

1. The voltage without parenthesis represents the value measured with PAL colour signal.

2. The voltage in parenthesis represents the

with no signal.

value

measured

3. All the voltages were measured by using a high impedance

SERVICE

THE AREA ENCLOSED BY THIS LINE ( DIRECTLY CONNECTED WITH AC MAINS VOLTAGE. WHEN SERVICING THE AREA, CONNECT AN ISOLATING TRANSFORMER BETWEEN TV RECEIVER AND AC LINE TO

EUMINATE

’ ’ ’ ’ ’ 1 NOrM / / /BuI TR$ ‘1 “1’~ / 1 N,pu 1 1 ISLI llRk+! 01,~ j 1 NOI. / j 1% 1

1, ‘1 “1,~ 1 [

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!A.*

PRECAUTION:

HAZARD OF ELECTRICSHOCK.

NOr ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’

A

St.4

,

A.

-

IS

)

voltmeter.

WAVEFORM

MEASUREMENT CONDI-

TIONS:

1. The colour bar signal applied

2. The tuner AGC voltage is

iJ i [A / i 1

I 1rnl

approximately4V

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to

the

f

TP40 1

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150’

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550 vp-p

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1

SX-51B8

SCHEMATIC

DIAGRAM:

i

1

I r

n

Cl331

1” eo”, IN7

AVUnit

+&WI

Cl326

md-

Q)o@l4

L.J.00,

0

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mm

TA7347P

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0

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2

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9

4

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5

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6

I

Sharp sx51b8 schematic

Specifications and Main Features

Frequently Asked Questions

User Manual