Toshiba 2152 DB Посібник з експлуатації

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TOSHIBA 2152 DB

General Information

Chassis: C5S

Safety Instructions

X-RAY RADIATION PRECAUTION

2. It is essential that to maintain the safety of the

1. The E.H.T. must be checked every time the

customer all cable forms be replaced exactly

receiver is serviced to ensure that the C.R.T.

as supplied from factory.

does not emit X-ray radiation as result of

3. A small part of the chassis used in this

excessive E.H.T. voltage. The nominal E.H.T.

receiver is, when operating, at approximately

for this receiver is 27.8 kV at zero beam

half mains potential at all times. It is therefore

current (minimum brightness) operating at

essential in the interest of safety that when

240V a.c. The maximum E.H.T. voltage

serving or connecting any test equipment the

permissible in any operating circumstances

receiver should be supplied via a suitable

must not exceed 29.0 kV. When checking the

isolating transformer of adequate rating.

E.H.T., use the 'High Voltage Check' proce-

4. Replace blown fuses within the receiver with

dure in this manual using an accurate E.H.T.

the fuse specified in the parts list.

voltmeter.

5. When replacing wires or components to

2. The only source of X-RAY radiation in this

terminals or tags, wind the leads around the

receiver is the C.R.T. To prevent X-ray

terminal before soldering. When replacing

radiation, the replacement C.R.T. must be

safety components identified by the interna-

identical to the original fitted as specified in

tional hazard symbols on the circuit diagram

the Parts List.

and parts list, it must be a Toshiba approved

3. Some components used in this receiver have

type and must be mounted as the original.

safety related characteristics preventing the

6. Keep wires away from high temperature

C.R.T. from emitting X-ray radiation. For

components.

continued safety, replacement component

should only be made after referring the

PRODUCT SAFETY NOTICE

Product Safety Notice below.

Many electrical and mechanical components in

this chassis have special safety-related

SAFETY PRECAUTION

characteristics. These characteristics are often

1. This receiver has a nominal working E.H.T.

passed unnoticed by a visual inspection and the

voltage of 24.5 kV. Extreme caution should be

X-ray radiation protection afforded by them

exercised when working on the receiver with

cannot necessarily be obtained by using

the back removed. Do not attempt to service

replacements rated at higher voltages or

this receiver if you are not conversant with the

wattage, etc. Components which have these

precautions and procedures for working on

special safety characteristics in this manual and

high voltage equipment. When handling or

its supplements are identified by the interna-

working on the C.R.T., always discharge the

tional hazard symbols on the schematic diagram

anode to the receiver chassis before removing

and parts list. Before replacing any of these

the anode cap. The C.R.T., if broken, will

components read the parts list in this manual

violently expel glass fragments. Use shatter

carefully. Substitute replacement components

proof goggles and take extreme care while

which do not have the same safety characteris-

handling. Do not hold the C.R.T. by the neck

tics as specified in the parts list may create X-

as this is a very dangerous practice.

ray radiation

Recommended Safety Parts

Item

Part No.

Description

PF, 6600pF, ±3%, 1500V

C440

24082476

CD, 1500pF, ±10%

C463

24212152

PF, 0.22uF, ±20%, AC250V

C801

24082363

C813

24094656

CD,2200pF,±20%, AC400V

C814

24094656

CD,2200pF,±20%, AC400V

R327

24339569

MF, 5.6 ohm, 2W

R448

24338338

MF, 0.33 ohm, 1W

R801

24009954

Metal-Glazed Resistor, 2.2M ohm, 1/2W

R808

24019340

PTC Thermistor, 290V, 18 ohm

R890

24381333

OME, 33k ohm, 1/2W

R899

24005007

Metal-Glazed Resistor, 8.2M ohm, 1W

R920

24000940

FR, 2 ohm, 2W

R920

24000568

FR, 4.7 ohm, 1W

L462

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

DY, Supplied with V901

L901

23200205

Coil, Degaussing, TSB-2333AR

T401

23224983

Transformer, Horiz. Drive, TLN1039

T461

23236464

Transformer, Flyback, TFB41 23AR

T801

23211858

Line Filter, TRF3139

T862

23217287

Transformer, Converter, TPW3331AR

Q404

23314375

Transistor, ON4409(508D)

Q862

A8643108

Photo Coupler, TLP621(GR-LF

F470

23144875

Fuse, 0.63A

F801

23144507

Fuse, 3.15A

P801

23372012

Power Cord

S801

23145434

Switch, Power, 2C2P

V901A

23902067

Socket, CRT, 10P

V901

23312642

Picture Tube, A51EF543X69

V901

23312571

Picture Tube, A51EAL55X01

Safety Instructions / Safety Parts / Service Adjustments / Service Mode General Instructions / Service Mode Cont'd / Test Signal Selection

Adjustment of Video Chroma System / CRT Diagram / Text Diagram / AV Diagram / Main Diagram / Main Diagram Cont'd

Service Adjustments

GENERAL INFORMATION

All adjustments are thoroughly checked and

corrected when the receiver leaves the factory.

Therefore the receiver should operate normally

and produce proper colour and B/W pictures

upon installation. However, several minor

adjustments may be required depending on the

particular location in which the receiver is

operated.

This receiver is shipped completely in cardboard

carton. Carefully draw out the receiver from the

carton and remove all packing materials. Plug

the power cord into a convenient 240 volts 50

Hz AC two pin power outlet. Turn the receiver

ON. Check and adjust all the customer controls

such as BRIGHTNESS, CONTRAST and

COLOUR Controls to obtain natural colour or B/

W picture.

AUTOMATIC DEGAUSSING

A degaussing coil is mounted around the picture

tube so that external degaussing after moving

the receiver is normally unnecessary, providing

the receiver is properly degaussed upon

installation. The degaussing coil operates for

about 1 second after the power to the receiver is

switched ON. If the set is moved or faced in a

different direction, the power switch must be

switched off at least 30 minutes in order that the

automatic degaussing circuit operates properly.

Should the chassis or parts of the cabinet

become magnetized to cause poor colour purity,

use an external degaussing coil. Slowly move

the degaussing coil around the faceplate of the

picture tube, the sides and front of the receiver

and slowly withdraw the coil to a distance of

about 2 m before disconnecting it from AC

source. If colour shading still persists, perform

the COLOUR PURITY ADJUSTMENT and

CONVERGENCE ADJUSTMENTS procedures.

HIGH VOLTAGE CHECK

CAUTION: There is no HIGH VOLTAGE

ADJUSTMENT on this chassis.

1. Connect an accurate high voltage meter to

the second anode of the picture tube.

2. Turn on the receiver. Set the BRIGHTNESS

and CONTRAST Controls to minimum (zero

beam current).

3. High voltage will be measured below 29.0 kV

(2152DB), 32.0 kV (2857DB).

HEIGHT ADJUSTMENT

RTV servis Horvat

1. Receive the UK PHILIPS pattern, and set the

contrast to max, colour and brightness to

Tel:

++385-31-856-637

centre.

Tel/fax: ++385-31-856-139

2. Adjust HEIGHT Control (R350) so that white

Mob:

098-788-319

blocks at top and bottom of the picture are

www.rtv-horvat-dj.hr

just masked.

HORIZONTAL CENTRE ADJUSTMENT

1. Receive the UK PHILIPS pattern.

2. Adjust HPOS (Bus control) so the pattern

centre can be located at the screen centre.

FOCUS ADJUSTMENT

Adjust FOCUS Control on FLYBACK TRANS.

(T461) for well defined scanning lines in the

centre area on the screen.

SET-UP ADJUSTMENT

The following adjustments should be made

when a complete realignment is required or a

new picture tube is installed.

Perform the adjustments in order as follows:

1. Color Purity

2. Convergence

3. White Balance

Note: The PURITY/CONVERGENCE MAGNET

assembly and rubber wedges need mechanical

positioning. Refer to figures

COLOR PURITY ADJUSTMENT

NOTE: Before attempting any purity adjust-

ments, the receiver should be operated for at

least fifteen minutes.

1. Demagnetize the picture tube and cabinet

using a degaussing coil.

2. Set the brightness and contrast to maximum.

3. Use a green raster from among the built-in

test signals.

4. Loosen the clamp screw holding the yoke and

slide the yoke backward or forward to provide

vertical green belt (zone) in the picture

screen.

5. Remove the Rubber Wedges.

6. Rotate and spread the tabs of the purity

magnet around the neck of the picture tube

until the green belt is in the center of the

screen. At the same time, enter the raster

vertically.

7. Slowly move the yoke forward or backward

until a uniform green screen is obtained.

Tighten the clamp screw of the yoke tempo-

rarily.

8. Check the purity of the red and blue raster.

CONVERGENCE ADJUSTMENTS

NOTE: Before attempting any convergence

adjustments, the receiver should be operated for

at least fifteen minutes.

CENTRE CONVERGENCE ADJUSTMENT

1. Use the cross-dot pattern from among the

built-in test signals.

2. Set the brightness and contrast for well

defined pattern.

3. Adjust two tabs of the 4-Pole Magnets to

change the angle between them and superim-

pose red and blue vertical lines in the center

area of the picture screen.

4. Turn the both tabs at the same time keeping

the angle constant to superimpose red and

blue horizontal lines at the center of the

screen.

5. Adjust two tabs of 6-Pole Magnets to superim-

pose red/blue line and green one. Adjusting

the angle affects the vertical lines and rotating

both magnets affects the horizontal lines.

6. Repeat adjustments 3, 4, 5 keeping in mind

red, green and blue movement, because 4-

Pole Magnets and 6-Pole Magnets have

mutual interaction and make dot movement

complex.

CIRCUMFERENCE CONVERGENCE

ADJUSTMENT

1. Loosen the clamping screw of deflection yoke

slightly to allow the yoke to tilt.

2. Temporarily put a wedge as shown. (Do not

remove cover paper on adhesive part of the

wedge.)

3. Tilt front of the deflection yoke up or down to

obtain better convergence in circumference.

Push the mounted wedge into the space

between picture tube and the yoke to fix the

yoke temporarily.

4. Put other wedge into bottom space and

remove the cover paper to stick.

5. Tilt front of the yoke right or left to obtain

better convergence in circumference.

6. Keep the yoke position and put another

wedge in either upper space. Remove cover

paper and stick the wedge on picture tube to

fix the yoke.

7. Detach the temporarily mounted wedge and

Service Mode General

put it in another upper space. Stick it on

picture tube to fix the yoke.

8. After fixing three wedges, recheck overall

convergence. Tighten the screw firmly to fix

1. ENTERING TO SERVICE MODE

the yoke and check the yoke is firm.

9. Stick three adhesive tapes on wedges.

1) Press

button once on Remote Control.

2) Press

button again to keep pressing.

3) Keep pressing the

button on TV set.

RCUT

32H

(Service mode dIsplay)

2. SELECTING THE ADJUSTING ITEMS

Every pressing of CHANNEL

the adjustment items in the following order.

(

button for reverse order.)

3. ADJUSTING THE DATA

Pressing of VOLUME

the value of data in the range from 00 to FF. The

variable range depends on the adjusting item.

4. NORMAL OPERATION ON THE SERVICE

MODE

Press MENU button on TV.

Adjustment mode

RCUT

32H

5. EXIT FROM SERVICE MODE

Press POWER button on the remote control to

turn off the TV once.

Dot Movement Pattern

Instructions

button, press MENU

button changes

button will change

Service mode

Address

Data

Press