Quadro CTV-37D10 TXT, CTV-55N11 TXT, CTV-55X10 TXT, CTV-55D10 TXT, CTV-55Z10 TXT Service Manual

MODELS:

CTV-37D10 TXT

CTV-55N11 TXT

CTV-55D10 TXT

CTV-55X10 TXT

MkI

I

CTV-55V20 TXT

CTV-55Z10 TXT

MkII

MkIII

SERVICE MANUAL

Brown goods
TV SETS 14", 21" 3P51 chasis

Safety Notice

-2-

SAFETY PRECAUTIONS

1:An isolation transformer should be connected in the power line between the receiver

and

the

AC line when a service is performed on the primary of the converter transformer of the

set.

2:Co mply with all caution and safety-related notes provided on the cabinet back, inside the

cabinet, on the chassis or the picture tube.

3:When replacing a chassis in the cabinet, always be certain that all the protective devices

are installed properly,such as,control knobs, adjustment covers or shields, barriers,isola­ tion resistor-capacitor networks etc.. Before returning any television to the customer, the
service technician must be sure that it is completely safe to operate without danger of
electrical shock.

X-RADIATION PRECAUTION

The

primary source of X-RADIATION in television receiver is the picture tube. The picture

tube

is

specially constructed to limit X-RADIATION emissions. For continued X-RAD

I

A

TION

protection, the replacement tube must be the same type as the original including suffix

letter.

Excessive high voltage may produce potentially hazardous X-RADIATION. To avoid

such

hazards, the high voltage must be maintained within specified limit. Refer to this
service manual, high voltage adjustment for specific high voltage limit. If high voltage exce­eds specfied limits, take necessary corrective action. Carefully follow the instructions for
+B1 volt power supply adjustment, and high voltage check to maintain the high voltage
within the specified limits.

PRODUCT SAFETY NOTICE

Product safety should be considered when a component replacement is made in an y area
of a receiver. Components indicated by mark in the parts list and the s

chema

tic

diagram

designate components in which safety can be of special significance. It is

particularly

recommended that only parts designated on the parts list in this

manual be used for com-

ponent replacement designated by mark . No deviations fromresistance

wattag e

or

vol-

tage ratings may be made for replacement items designated by mark .

!

!

!

Contents

Safety Notice-------------------------------------------------------------------------

2

Chassis Block Diagram------------------------------------------------------------­IC

Block Diagram --------------------------------------------------------------------

5-8

-

12

PCB Top/Bottom layer ------------------------------------------------------------­Service Adjustments ---------------------------------------------------------------­Purity

and Convergence Adjustment--------------------------------------------­Control Location --------------------------------------------------------------------­Input and Output Terminals--------------------------------------------------------­Operation Instructions-------------------------------------------------------------­Mechanical Disassemblies--------------------------------------------------------­Circuit Diagram-----------------------------------------------------------------------

1

-

2

6

2
2
2

-

3

3

Technical specification--------------------------------------------------------------

3
4

9

1

0

-

3

2

2
3
4
5

3
4

3

5

TRANSISTOR MARK

--------------------------------------------------------------

-3-

SPECIFICATIONS

Design and specifications are subject to change without prior notice.

Receiving System : BG / DK / I / M
Colour System : PAL / SECAM / NTSC
Picture Tube : 54cm (21") diagonal
Ext. Antenna : 75 Ohm Coaxial Cable
Ext. In/Out : Audio/video -in/out
Speaker : 8 Ohm(5W) x2
Audio Output(MAX) : 1KHZ 0.5Vrms, 5Wx2
10% THD Audio Output Power : 1KHZ 0.5Vrms, 5Wx2
Power Consumption : AC 110-240V 50Hz, 80W MAX
Dimension : 524(W) x 495(D) x 463(H)mm
Net Weight : 22 kg

REMOTE CONTROL
Transmitting System : Infrared
Power Supply : DC 3V (1.5 x 2)
Dimension : 28(W) x 155(L) x 45(D)mm
Net Weight : 83 g

Chassis Block Diagram

/

63

62

15

5

14

AV

2

R

AV

2

L

AV

1

R

AV

1

L

A

B

9

10

12

3

1

AUDIO OUT

4052

AUDIO SWITCH

TDA7056A

3

5023

xx

0

(stereo)

(mono)

BF422/BF423

4

-5-

IC BLOCK DIAGRAM

IC 101 TFA9842AJ(2Channel Audio Amplifier)

-6-

IC 401 (Vertical Deflection Booster) STV9302A

IC BLOCK DIAGRAM

IC 601 (Power Switch) F SCQ0765RT

-7-

1

INPUT

2

OUTPUT

SERIES
PASS
ELEMENT

SOA
PROTECTION

REFERENCE
VOLTAGE

ERROR
AMPLIFIER

THERRMAL
PROTECTION

STARTING
CIRCUIT

CURRENT
GENERATOR

REFERENCE
VOLTAGE

3

GND

IC 652 (Regulators) L7808Series

1

2

3

4

1:ANODE
2:CATHODE
3:EMITTER
4:COLLECTOR

IC 602 (Photo Transistor ) TLP421

IC BLOCK DIAGRAM

TLP421

-8-

IC 701 ( TDA9381 TV Signal Processor)

IC BLOCK DIAGRAM

2DD2499

C
1

81

5

A101

5

PNP

NPN

L7805

INPUT

GND

OUTPUT

INPUT

L7808

INPUT

GND

OUTPUT

C
2482

C

B

E

NPN

-9-

C

B

E

A9
6

6

PNP

TRANSISTOR MARK

NPN

C

B

E

C

B

E

C
2

12
0

NPN

C

B

E

C
27

17

NPN

C

B

E

B

C

E

B
F
4
2
1

PNP

C

B

E

B
F
4
2
1

PNP

C

B

E

B
F
4
2
2

NPN

C

B

E

B
F
4
2

3

PNP

C

B

E

MAIN PCB Top Layer

-10-