Toshiba 14AS20 Schematic

FILE NO. 063-200006

SERVICE MANUAL

COLOR TELEVISION

N0E Chassis

14AS20

(TAC0002)

– SUMMARY –

14AS20 is the same as 19A20 except for the parts and setting & adjusting data tabled on back of this sheet. Use this service manual together with the service manual of 19A20 (File No. 020-200003).

PUBLISHED IN JAPAN, Aug., 2000 So

SETTING & ADJUSTING DATA DIFFERENCES

SAFETY INSTRUCTIONS

CIRCUIT CHECKS

REPLACEMENT PARTS LIST DIFFERENCES

14" HIGH VOLTAGE AT ZERO BEAM: (A) 23.5 kV MAX HIGH VOLTAGE:

(B) 24.9 kV

Table-1

FBT DETECTION VOLTAGE (C) 21.02V

Table-4

Location

No.

A201 23549359 Front Cover A401 23003326 Back Cover A701 23525144 Case A702A 23935906 Packing A702B 23935907 Packing C230 24794470 EL, 47?F, ±20%, 16V C310 24796470 EL, 47?F, ±20%, 35V C311 24214101 CD, 100pF, ±10%, 500V C440 24082952 PF, 6200pF, ±3%, 1500V C611 24591104 PF, 0.1?F C810 24086939 EL, 330?F, ±20%, 200V D472 23115774 Diode, Zener, RD6.2E(4) E502 23848729 Rubber Wedge L462 23231183 Deflection Yoke, TDY-314QY L901 23200306 Coil, Degaussing, TSB-2219AL M051Z Main Board, PB9391B1

*

M052Z CRT Drive Board, PB9391B2

*

P801 23372123 Power Cord R227 24366473 CF, 47k ohm R304 24366473 CF, 47k ohm R305 24322159 MF, 1.5 ohm, 1W R306 24366683 CF, 68k ohm R307 24366474 CF, 470k ohm R312 24381222 OMF, 2200 ohm, 1/2W R313 24366274 CF, 270k ohm

Part No. Description

Location

No.

R317 24366243 CF, 24k ohm R327 24338689 MF, 6.8 ohm, 1W R416 24019327 OMF, 2700 ohm, 5W R475 24367821 CF, 820 ohm, ±2% R802 24376274 CF, 270k ohm, 1/2W R808 24000209 PTC Thermistor, 14 ohm,

R810 24510229 Cement, 2.2 ohm, 5W R811 24569241 Cement, 240 ohm, 10W R812 24510689 Cement, 6.8 ohm, 5W R920 24000568 FR, 4.7 ohm, 1W R921 24366471 CF, 470 ohm R922 24366471 CF, 470 ohm R923 24366471 CF, 470 ohm R931 24366122 CF, 1200 ohm R932 24366122 CF, 1200 ohm R933 24366122 CF, 1200 ohm T461 23236589 Transformer, Flyback,

V901 23312577 Picture Tube, A34JFQ90X(VW) V901M 23102409 Magnet, Purity-Convergence,

Y101 23565007 Owner’s Manual,

Part No. Description

±20%, AC140V

TFB4139AY

MAG-1070

English/Spanish, 14AS20

TOSHIBA CORPORATION

1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN

FILE NO. 020-200003

SERVICE MANUAL

COLOR TELEVISION

N0E Chassis

19A20

(TAC0001)

PRINTED IN U.S.A. Mar., 2000 U

CHAPTER 1 GENERAL ADJUSTMENTS

SAFETY INSTRUCTIONS........................................................................................................................................3

SET-UP ADJUSTMENT............................................................................................................................................4

SERVICE MODE ...................................................................................................................................................... 8

DESIGN MODE ...................................................................................................................................................... 11

ELECTRICAL ADJUSTMENTS ..............................................................................................................................12

CIRCUIT CHECKS .................................................................................................................................................14

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

CHAPTER 2 SPECIFIC INFORMATIONS

SETTING & ADJUSTING DATA ............................................................................................................................. 15

LOCATION OF CONTROLS................................................................................................................................... 16

PROGRAMMING CHANNEL MEMORY.................................................................................................................17

CIRCUIT BLOCK DIAGRAM ..................................................................................................................................18

CHASSIS AND CABINET REPLACEMENT PARTS LIST......................................................................................19

PC BOARDS BOTTOM VIEW ................................................................................................................................23

TERMINAL VIEW OF TRANSISTORS ................................................................................................................... 26

TABLE OF CONTENTS

SPECIFICATIONS ..................................................................................................................................................29

APPENDIX:

CIRCUIT DIAGRAM

– 2 –

CHAPTER 1 GENERAL ADJUSTMENTS

SAFETY INSTRUCTIONS

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU-

TION” AND “PRODUCT SAFETY NOTICE” INSTRUCTIONS BELOW.

X-RAY RADIATION PRECAUTION

1. Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid such hazards, the high voltage must not be abov e the specified limit. The nominal value of the high voltage of this receiver is (A) kV at zero beam current (minimum brightness) under a 120V AC power source. The high voltage must not, under any circumstances, exceed (B) kV.

Refer to table-1 for high voltage (A), (B). (See SETTING & ADJUSTING DATA on page 15)

Each time a receiver requires servicing, the high voltage should be checked f ollowing the HIGH VOLTAGE CHECK procedure in this manual. It is recommended that the reading of the high voltage be recorded as a part of the service record. It is important to use an accurate and reliable high voltage meter.

SAFETY PRECAUTION

2. This receiver is equipped with a Fail Safe (FS) circuit which prevents the receiver from producing an excessively high voltage ev en if the B+ voltage increases abnormally. Each time the receiver is serviced, the FS circuit must be checked to determine that the circuit is properly functioning, following the FS CIRCUIT CHECK procedure in this manual.

3. The only source of X-RAY RADIA TION in this TV receiver is the picture tube. F or contin ued X-RAY RADIATION protection, the replacement tube must be exactly the same type tube as specified in the parts list.

4. Some part in this receiver have special safety-related characteristics for X-RAY RADIATION protection. For continued safety, parts replacement should be undertaken only after referring to the PRODUCT SAFETY NO TICE below.

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

WARNING : Service should not be attempted by any one unf amiliar with the necessary precautions on this receiver. The following are the necessary precautions to be observed before servicing this chassis.

1. An isolation Transf ormer should be connected in the power line between the receiver and the AC line bef ore an y service is performed on the receiver.

2. Always discharge the picture tube anode to the CR T conductive coating before handling the picture tube . The picture tube is highly evacuated and if broken, glass fragments will be violently expelled. Use shatter proof goggles and keep picture tube away from the unprotected body while handling.

3. When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in place, such as; non-metallic control knobs, insulating covers, shields, isolation resistor-capacitor network etc.

4. Before returning the set to the customer, always perform an AC leakage current check on the e xposed metallic parts of the cabinet, such as antennas, terminals, screwheads, metal overlays, control shafts etc. to be sure the set is safe to operate without danger of electrical shock. Plug the AC line cord directly into a 120V AC outlet (do not use a line isolation transformer during this check). Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the following manner:

Connect a 1500 ohm 10 watt resistor, paralleled b y a 0.15 µF, AC type capacitor, between a known good earth ground (water pipe, conduit, etc.) and the exposed metallic parts, one at a time. Measure the AC voltage across the combination of 1500 ohm resistor and 0.15 µF capacitor. Reverse the AC plug at the AC outlet and repeat AC voltage measurements for each exposed metallic part. Voltage measured must not exceed 0.3 v olts rms. This corresponds to 0.2 milliamp. AC. Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately.

AC VOLTMETER

0.15µF Place this probe on

Good earth ground such as a water pipe, conduit, etc.

1500 ohm 10 watt

each exposed metallic part.

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These characteristics are often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained b y using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this manual and its supplements; electrical components having such features are identified by the international hazard symbols on the schematic diagram and the parts list. Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement parts which do not have the same safety characteristics as specified in the parts list may create shock, fire, X-ray radiation or other hazards.

– 3 –

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAUTION” AND “PRODUCT SAFETY NOTICE” ON PAGE 3 OF THIS MANUAL.

SET-UP ADJUSTMENT FOR 13", 14", 19", 20".

■ 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.

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

*

COLOR PURITY ADJUSTMENT NOTE : Before attempting any purity adjustments, the receiver

1. Demagnetize the picture tube and cabinet using a degauss-

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

Refer to figure 1. Mounting position of the purity magnet assembly should fit to same position as old one because slightly difference to the position depend on a kind of tube.

There are no adjustment of purity and convergence in some picture tube (Unified with purity magnet)

should be operated for at least fifteen minutes.

ing coil.

yoke backward or forward to provide vertical green belt (zone) in the picture screen.

SET-UP ADJUSTMENT

5. Remove the Rubber Wedges.

6. Rotate and spread the tabs of the purity magnet (See figure 2.) 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 temporarily.

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

GLASS CLOTH TAPES

DEFLECTION YOKE

14mm(13", 14") 19mm(19", 20")

PURITY/ CONVERGENCE MAGNET ASS'Y

TEMPORARY MOUNTING

RUBBER WEDGE

ADHESIVE

DEFLECTION YOKE

Figure 1.

– 4 –

CONVERGENCE ADJUSTMENTS

NOTE: Before attempting any convergence adjustments, the

receiver should be operated for at least fifteen minutes.

■ CENTER 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 (See figure 2.) and superimpose 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 superimpose 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.

4-POLE MAGNETS

6-POLE MAGNETS

ADJUST THE ANGLE (VERTICAL LINES)

■ 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 in figure 1. (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. (See figure 3.) 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. (See figure 3.)

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 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 the yoke and check the y oke is firm.

9. Stick three adhesive tapes on wedges as shown in figure

1.

FIXED

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

ROTATE TWO TABS AT THE SAME TIME (HORIZONTAL LINES)

PURITY MAGNETS

CONVERGENCE MAGNET ASSEMBLY ADJUSTMENT OF MAGNETS

Figure 2.

BLU RED

BLU

RED

4-POLE MAGNETS MOVEMENT

BGR

R G B

RGB

RED/BLU

GRN

Center Convergence by Convergence Magnets

B G R

RED/BLU GRN

6-POLE MAGNETS MOVEMENT

B G R

BGR

RGB

R

G

B

INCLINE THE YOKE UP (OR DOWN)

Circumference Convergence by DEF Yoke

Figure 3. Dot Movement Pattern

INCLINE THE YOKE RIGHT (OR LEFT)

– 5 –

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAUTION” AND “PRODUCT SAFETY NOTICE” ON PAGE 3 OF THIS MANUAL.

SET-UP ADJUSTMENT FOR 35", 36".

■ 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 figure 1.

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

*

COLOR PURITY ADJUSTMENT

NOTE : Before attempting any purity adjustments, the

1. Evenly degauss the entire screen.

2. Set the CONTRAST and BRIGHTNESS Controls to

3. Display built-in green raster using the TEST SIGNAL

4. Loosen the clamp screw holding the deflection yoke

5. Slide the yoke forward or backward to provide vertical

6. Rotate and spread the tabs of the purity magnet (See

Mounting position of the purity magnet assembly should fit to same position as old one because slightly difference to the position depend on a kind of tube.

There are no adjustment of purity and convergence in some picture tube (Unified with purity magnet)

receiver should be operated for at least fifteen minutes.

the maximum. SELECTION function. (and remove the Rubber Wedges). green belt (zone) in the picture screen. figure 4.) around the neck of the picture tube until the

green belt is in the center of the screen. At the same time, center the raster vertically by adjusting the magnet as shown below.

Xv Coil

DEFLECTION YOKE

1-5/8"

PURITY/ CONV. MAGNET

Green Belt

7. Move the yoke slowly forward or backward until a uniform green screen is obtained. Tighten the clamp scre w of the yoke temporarily.

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

9. Put four wedges into the space between the picture tube and the yoke to hold the yoke in the adjusted position. (See figure 2.) Do not tilt the yoke by excessive insertion of the wedge.

10. Remove cover paper of wedge and stick wedges on the tube to fix the yoke in the adjusted position. Fix the wedges with glass cloth tapes.

Figure 1.

RUBBER WEDGES

Adhesive

DEFLECTION YOKE

Figure 2.

– 6 –

CONVERGENCE ADJUSTMENTS

NOTE: Before attempting any convergence adjustments,

the receiver should be operated for at least fifteen minutes.

■ CENTER CONVERGENCE ADJUSTMENT

1. Display built-in cross-dot pattern using the TEST SIGNAL SELECTION function.

2. Adjust the BRIGHTNESS and CONTRAST Controls for well defined pattern.

3. Loosen the tightening ring and adjust two tabs of the 4-Pole Magnets to change the angle between them (See figure 4.) and superimpose red and blue vertical lines in the center area of the picture screen. (See figure 3.)

4. Turn the both tabs at the same time keeping the constant angle to superimpose red and blue horizontal lines at the centre of the screen. (See figure 3.)

5. Adjust two tabs of 6-Pole Magnets to superimpose red/ blue line with 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 6Pole magnets interact and make dot movement complex.

7. After completing the “CENTER CONVERGENCE ADJUSTMENT” tighten the tightening ring to fix the magnets.

BLU RED

RED/BLUE GRN

6-POLE MAGNETS

PURITY MAGNETS

ADJUST THE ANGLE

(VERTICAL LINES)

4-POLE MAGNETS

PURITY/CONVERGENCE MAGNETS

FIXED

ROTATE TWO TABS AT THE SAME TIME

(HORIZONTAL LINES)

ADJUSTMENT OF MAGNETS

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

BLU

RED

4-POLE MAGNETS MOVEMENT

Center Convergence by Convergence Magnets

■ Xv COIL ADJUSTMENT

Adjust the Xv coil (on the deflection yoke) to correct misconvergence at both sides on screen. Use a hexagonal tip stick (plastic) to adjust the core of coil.

Clockwise Adjustment Counterclockwise Adjustment

R

B

RED/BLUE

Figure 3.

B

R

GRN

6-POLE MAGNETS MOVEMENT

B

R

B

Figure 4.

■ SCREEN-CORNER CONVERGENCE

When the misconvergence is still evident on corners even though the above adjustment is done, use the ferrite sheet (Part No. 23993622) to correct misconvergence.

1. Put ferrite sheets into the space under the yoke. Decide such position that misconvergence becomes minimum, watching picture screen. (See figure below .)

2. Remove cover paper of ferrite sheet to stick it in the place on the tube. Put adhesive tapes on ferrite sheets to fix.

Ferrite

Sheets

Ferrite

Sheets

A

Xv Cross Pattern View

For correcting misconvergence on the position A

– 7 –

1. ENTERING TO SERVICE MODE

1) Press MUTE button once on Remote Control.

MUTE

SERVICE MODE

2) Press MUTE button again to keep pressing.

3) While pressing the MUTE button, press MENU button on TV set.

S

(Service mode display)

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

2. DISPLAYING THE ADJUSTMENT MENU

1) Press MENU button on TV.

Service mode

3. KEY FUNCTION IN THE SERVICE MODE

The following key entry during display of adjustment menu provides special functions. Test signal selection : TV (ANT)/VIDEO button (on Remote)

Selection of the adjustment items : Channel s/t (on TV or Remote) Change of the data value : Volume s/t (on TV or Remote) Adjustment menu mode ON/OFF : MENU button (on TV) Initialization of the memory (QA02) : RECALL+Channel (s) button on TV Initialization of the self diagnostic data: RECALL+Channel (t) button on TV

“RCUT” selection : 1 button “GCUT” selection : 2 button “BCUT” selection : 3 button “CNTX” selection : 4 button “COLC” selection : 5 button “TNTC” selection : 6 button Test audio signal ON/OFF (1kHz) : 8 button Self diagnostic display ON/OFF : 9 button A single horizontal line ON/OFF: 100 button

Adjustment mode

S

Press

Item Data

– 8 –

4. SELECTING THE ADJUSTING ITEMS

1) Every pressing of CHANNEL s button in the service mode changes the adjustment items in the order of table-2. (t button for reverse order)

Refer to table-2 for preset data of adjustment mode. (See SETTING & ADJUSTING DATA on page 15)

5. ADJUSTING THE DATA

1) Pressing of VOLUME s or t button will change the value of data in the range from 00H to FFH. The variable range

depends on the adjusting item.

6. EXIT FROM SERVICE MODE

1) Pressing POWER button to turn off the TV once.

■ INITIALIZATION OF MEMORY DATA OF QA02

After replacing QA02, the following initialization is required.

1. Enter the service mode, then select any register item.

2. Press and hold the RECALL button on the Remote, then press the CHANNEL s button on the TV. The initialization of QA02 has been complated.

3. Check the picture carefully. If necessary, adjust any adjustment item above. Perform “Programming Channel Memory”.

CAUTION: Never attempt to initialize the data unless QA02 has been replaced.

7. TEST SIGNAL SELECTION

1) Every pressing of TV/VIDEO button on the Remote Control in the Service mode changes the built-in test patterns on screen in the following order.

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

Normal picture Black cross-bar

on green raster

Red raster Green raster Blue raster All black All white White and black Black cross-bar White cross-bar

2) Press “8” button while any built-in test pattern to on the screen to output the 1 kHz sound. Press the button again to cut off the sound.

Note: If the video cable is connected to the VIDEO1 INPUT jack, the

built-in pattern signals are not displayed.

H signal (black) H signal (white) White cross-dot Black cross-dot White cross-hatch

Black cross-hatch

Signals Picture

• Red raster

• Green raster

• Blue raster

• All Black

• All White

• Black & White

• Black cross-bar

• White cross-bar

• Black cross-bar on green raster

• Black cross-hatch

• White cross-hatch

• Black cross-dot

• White cross-dot

• H signal (white)

• H signal (black)

The signals marked with are not usable to display in the Test signal for some model.

*

– 9 –

8. SELF DIAGNOSTIC FUNCTION (MTS Model)

1) Press “9” button on Remote Control during display of adjustment menu in the service mode. The diagnosis will begin to check if interface among IC’s are executed properly.

2) During diagnosis, the following displays are shown.

SELF CHECK

1 2 3 4 5

NO. 23XXXXXX POWER : 000 BUS LINE : OK BUS CONT : OK BLOCK : UV V1 V2 or QV01 QV01S SYNC

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

1 Part number of microprocessor (QA01)

2 Operation number of protection circuit (current limiter) . . . . “000” is normal.

3 BUS line check “OK” ................... Normal

4 BUS line ACK (acknowledge) check

5 Sync. signal check Green display..... Normal

“SCL-GND” or “NG” .......... SCL-GND short circuit

“SDA-GND” or “NG”.......... SDA-GND short circuit

“SCL-SDA” or “NG”........... SCL-SDA short circuit

“OK” ..................... Normal

Display of Location Number . . . . NG

(Display example) “QA02 NG”, “H001 NG”, “Q501 NG” etc. Note: The indication of failure place is only one place though failure places are plural. When

repair of a failure place finishes, the next failure place is indicated. (The order of priority of indication is left side.)

Cyan display ......No check

Red display ........ NG

UV........... TV mode

V1 ........... VIDEO 1 mode

V2 ........... VIDEO 2 mode

9. SELF DIAGNOSTIC FUNCTION (Monaural Model)

1) Press “9” button on Remote Control during display of adjustment menu in the service mode. The diagnosis will begin to check if interface among IC’s are executed properly.

2) During diagnosis, the following displays are shown.

NO. 23XXXXXX SELF CHECK POWER : 000 BUS : OK NO ACK :

The items marked with are not usable to display in the SELF DIAGNOSTIC FUNCTION for some model.

*

Part number of microprocessor (QA01)

Operation number of protecting circuit ----"000" is normal. BUS line check ----"OK" is normal.

"[blank]" is normal.

– 10 –

1. ENTERING TO DESIGN MODE

1) Select the Service mode.

DESIGN MODE

2) While pressing RECALL button on. Remote and press MENU button on TV.

3) Press MENU button on TV.

S D

(Design mode) (Adjustment mode)

When QA02 is initialized, items “OPT0” and “OPT1” of DESIGN MODE are set to the data of the representative model of this chassis family. Therefore, because ON-SCREEN specification remains in the state of the representative of model. This model is required to reset the data of items “OPT0” and “OPT1”.

2. SELECTING THE ADJUSTING ITEMS

Every pressing of CHANNEL t button in the design mode changes the adjustment items in the order of table-3. (s button for reverse order)

Refer to table-3 for data of design mode. (See SETTING & ADJUSTING DATA on page 15)

3. ADJUSTING THE DATA

Pressing of VOLUME s or t button will change the value of data.

Press

ITEM DATA

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

– 11 –

ELECTRICAL ADJUSTMENTS

ITEM ADJUSTMENT PROCEDURE

FOCUS VR ADJ.

SUB-BRIGHTNESS (BRTC)

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

SUB-COLOR (COLC) SUB-TINT (TNTC)

1. Enter the service mode, then select any register item.

2. Press the TV/VIDEO button on the Remote until the black cross-bar pattern appears on the screen.

3. Adjust the FOCUS control (on T461) for well defined scanning lines on the picture screen.

1. Constrict the picture height until the vertical retrace line appears adjusting the HEIGHT control on the MAIN board.

2. Adjust the CONTRAST to the minimum and BRIGHTNESS to the center.

3. Enter the service mode, then select “BRTC” register.

4. Adjust the data value so the belt of vertical retrace line just disappear.

5. Adjust the CONTRAST for the desired contrast.

6. Adjust the HEIGHT control.

Vertical retrace line

1. Receive color-bar signal from color-bar generator.

2. Adjust the BRIGHTNESS and CONTRAST to the center (RESET status).

3. Connect oscilloscope pin 23 of Q501 on the MAIN board.

4. Enter the service mode, then select “COLC”.

5. Temporarily adjust the data value to achieve about 1V

of blue bar.

0-p

6. Select “TNTC” register.

7. Adjust the data value to obtain the blue bar to magenta bar ratio of 3:2 as shown.

8. Select “COLC” register.

9. Adjust the data value to achieve 1.25V

Magenta

0

0-p

Blue

3 (1.25V

2

of blue bar on scope.

10. Check the picture with off-air signal.

0-P

)

HORIZONTAL POSITION

(HPOS)

VERTICAL POSITION

(VPOS)

HEIGHT

(HIT)

1. Call up the adjustment mode display, then select the Item HPOS or VPOS.

2. Press the TV/VIDEO button until the white cross-bar or black cross-bar pattern appears on the screen.

3. Adjust the HORIZONTAL and VERTICAL position alternately by pressing the VOLUME s or t button for proper picture position.

4. Check the picture with off-air signal.

1. Call up the adjustment mode display, then select the Item HIT.

2. Press the VOLUME s or t button to get the picture so the top of raster begins to lack.

3. Press the VOLUME s button to advance the data by 8 steps.

Note : Check the vertical picture position is correct.

– 12 –

ITEM ADJUSTMENT PROCEDURE

WHITE BALANCE RCUT GCUT BCUT GDRV BDRV

1. Adjust the CONTRAST control to the center, and BRIGHTNESS control to the maximum.

2. Call up the adjustment mode display, and press the TV/VIDEO button until the white and black pattern appears on the screen.

3. Adjust the following address with the CHANNEL s/t and VOLUME s/t buttons.

RCUT

Item :

GCUT

Item :

BCUT

Item :

4. Press “100” button on the Remote Control to display a single horizontal line on the screen.

5. Turn the SCREEN control (FBT) fully counterclockwise and gradually rotate clockwise until the first horizontal line appears slightly on the screen.

6. Press “100” button to display the normal picture.

7. Adjust the remaining two “?CUT” Item (CHANNEL s/t → 100 → VOLUME s/t in order) to obtain the slightly lighted horizontal line in the same levels of three (red, green, blue) colors. The line should be white if the adjustments are proper.

Data : 30H Data : 30H Data : 30H

Bright area Adjust "GDRV" or "BDRV" to be white.

Dark area Fine adjust "RCUT", "GCUT" or "BCUT" to be black.

Item :

GDRV Data : 80H

Item :

BDRV Data : 80H

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

– 13 –

CIRCUIT CHECKS

HIGH VOL T A GE CHECK CAUTION: There is no HIGH VOLTAGE ADJUSTMENT on

this chassis. Checking should be done following the steps below.

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 must be measured below (B) kV. Refer to table-1 for high voltage (B).

(See SETTING & ADJUSTING DATA on page 15)

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

4. Vary the BRIGHTNESS control to both extremes to be sure the high voltage does not exceed the limit under any conditions.

FS CIRCUIT CHECK

The Fail Safe (FS) circuit check is indispensable for the final check in servicing. Checking should be done following the steps below.

1. Turn the receiver on and press the RESET button.

2. Temporarily short TP-(R) and TP-(X) with a jumper wire. Raster and sound will disappear.

3. The receiver must remain in this state even after removing the jumper wire. This is the evidence that the FS circuit is functioning properly.

4. To obtain a picture again, temporarily turn the receiver off and allow the FS circuit more than 5 seconds to reset. Then turn the power switch on to produce a normal picture.

Troubleshooting Guide for Fail Safe Circuit

Check that the set returns to normal operation when pin 12 of Z801(or emitter of Q472) is grounded with jumper wire.

YES NO

Check the voltage across Capacitor C471 is approximately (c) volts. Refer to table –4 for FBT detection voltage (c).

YES

Defective Fail Safe Circuit

(See SETTING & ADJUSTING DATA on page15)

NO

Faulty power circuit or horizontal circuit.

– 14 –

CHAPTER 2 SPECIFIC INFORMATIONS

SETTING & ADJUSTING DATA

SAFETY INSTRUCTIONS

HIGH VOLTAGE AT ZERO BEAM: (A) 24.7 kV MAX HIGH VOLTAGE:

Table-1

SERVICE MODE

ADJUSTING ITEMS AND DATAS IN THE SERVICE MODE:

(B) 26.1 kV

19"

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

Item

✩

RCUT

✩

GCUT

✩

BCUT

✩

GDRV

✩

BDRV CNTX

✩

BRTC

✩

COLC

✩

TNTC

✩

HPOS

✩

VPOS

✩

HIT

✩ These adjustments may be required when replacing QA02 and Q501.

DESIGN MODE

ADJUSTING ITEMS AND DATAS IN THE DESIGN MODE:

Item Name of adjustment

Name of adjustment Reference Data

RED CUT-OFF GREEN CUT-OFF BLUE CUT-OFF GREEN DRIVE BLUE DRIVE SUB-CONTRAST SUB-BRIGHTNESS SUB-COLOR SUB-TINT HORIZONRAL POSITION VERTICAL POSITION HEIGHT

Table-2

Preset Data

Data

30H 30H 30H 80H 80H 50H 38H

2CH

42H 19H 02H

1EH

Remarks

There are no adjusting item in the DESIGN MODE.

*

CIRCUIT CHECKS

Table-3

FBT DETECTION VOLTAGE (C)

T able-4

19"

22.03 V

– 15 –

Front

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

LOCATION OF CONTROLS

Remote Control

TV/VIDEO button

RECALL button

VOLUME T / S button (Menu T / S button)

MENU button

VOLUMEMENU

TV/VIDEO

RECALL MUTE

VOL

MENU EXIT

CHANNEL

1 2 3

4 5 6

7 8 9

100 0

CH

POWER

CH RTN

POWER

Remote sensor

POWER button

Channel Number button

RTN button

MUTE button

VOL

CHANNEL s/t buttons (Menu s/t buttons)

EXIT button

– 16 –

PROGRAMMING CHANNEL MEMORY

The channel memory is the list of TV channel numbers your TV will stop on when you press the CHANNEL s or t button.

First, use the TV/CABLE and CH PROGRAM functions to preset all active channels in your area.

If necessary, arrange the preset channels with the ADD/ERASE functions so that you can tune into only desired channels.

TV/CABLE function

1 Press POWER, to turn on the TV. 2 Press MENU (then s or t) repeatedly until "TV/CABLE" in

the Set up menu is displayed in purple.

3 Press ;(<) or :(>) until the mode that corresponds to your

TV signal system is displayed in purple.

CH PROGRAM function

1 Press MENU (then s or t) repeatedly until "CH PRO-

GRAM" in the Set up menu is displayed in purple.

2 Press ;(<) or :(>) to start channel programming.

The TV will automatically cycle through all the TV or CABLE channels depending on the mode selected, and store active channels in the channel memory.

3 When channel programming is complete, you will see the

message to the right.

4 Press CHANNEL s or t to make sure the channel pro-

gramming has been done properly.

ADD/ERASE function

After performing the CH PROGRAM function, you can add or erase specific channels.

1 Select the channel you want to erase using the CHANNEL

s or t button, or select the channel you want to add using the Channel Number buttons.

2 Press MENU (then s or t) repeatedly until “ADD/ERASE”

in the Set up menu is displayed in purple.

3 Press ;(<) or :(>) :

To erase the channel

Press the button until “Erase” is displayed in purple indicating that the channel has been erased from the memory.

To add the channel

Press the button until “ADD” is displayed in purple indicating that the channel has been memorized.

4 Repeat steps 1 to 3 for other channels.

You have now completed the channel programming.

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

– 17 –

MAIN BOARD

CRT DRIVE BOARD

AUDIO OUT

Q610

W661

SPEAKER

KEY

CONTROL

DB03

R/SENSOR

VOLT

REGU

QA02

MEMORY

QA01

MICROPROCESSOR

H001

TUNER/IF/VIDEO

Q501

VIDEO/CHROMA/DEF

SCL

SDA

5V

RMT IN

RESET

POWER

QB30

QB33

Q843

Q801

F470

Q471

FAIL SAFE

CRT HEATER

Q472

+134V

+32V

+9V

+26V

T461

FBT

Q421

Q402

Q404

Q301

L462

DEF YOKE

V901

PICTURE TUBE

H DRIVE

H. OUT

H OUT

V. OUT

+200V

SCREEN

FOCUS

H.V.

Q903

Q902

Q901

R

G

B

V OUT

B OUT

G OUT

R OUT

V-TV

AUDIO OUT

SCL

SDA

QB17

QB18

QB19

D840

P801

F801

F802

T801

SR81

L901

D801~D804

DEGAUSSING

COIL

CIRCUIT BLOCK DIAGRAM

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

CIRCUIT BLOCK DIAGRAM

– 18 –

CHASSIS AND CABINET REPLACEMENT PARTS LIST

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY

PRECAUTION” AND “PRODUCT SAFETY NOTICE” ON PAGE 3 OF THIS MANUAL.

CAUTION: The international hazard symbols “ ” in the schematic diagram and the parts list designate com- ponents which have special characteristics important for safety and should be replaced only with types identical to those in the original circuit or specified in the parts list. The mounting position of replacements is to be identical with originals. Before replacing any of these components, read carefully the PRODUCT SAFETY NOTICE. Do not degrade the safety of the receiver through improper servicing.

NOTICE:

•

The part number must be used when ordering parts, in order to assist in processing, be sure to include the Model

number and Description.

•

The PC board assembly with * mark is no longer available after the end of the production.

Models : 19A20

Capacitors ............. CD : Ceramic Disk PF : Plastic Film EL : Electrolytic

Resistors ............... CF : Carbon Film CC : Carbon Composition MF : Metal Film

OMF : Oxide Metal Film VR : Variable Resistor FR : Fusible Resistor

(All CD and PF capacitors are ±5%, 50V and all resistors, ±5%, 1/6W unless otherwise noted.)

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

Location

No.

CAPACITORSCAPACITORS

CAPACITORS

CAPACITORSCAPACITORS

C102 24793101 EL, 100?F, ±20%, 10V C105 24232103 CD, 0.01?F, +80%, -20% C106 24797479 EL, 4.7?F, ±20%, 50V C107 24794221 EL, 220?F, ±20%, 16V C201 24797478 EL, 0.47?F, ±20%, 50V C205 24794220 EL, 22?F, ±20%, 16V C207 24794100 EL, 10?F, ±20%, 16V C208 24797010 EL, 1?F, ±20%, 50V C209 24797229 EL, 2.2?F, ±20%, 50V C210 24794470 EL, 47?F, ±20%, 16V C211 24232103 CD, 0.01?F, +80%, -20% C230 24794331 EL, 330?F, ±20%, 16V C231 24232103 CD, 0.01?F, +80%, -20% C232 24206108 EL, 0.1?F, ±20%, 50V C233 24794100 EL, 10?F, ±20%, 16V C235 24436150 CD, 15pF C301 24617912 EL, 2.2?F, ±10%, 50V C302 24212152 CD, 1500pF, ±10% C305 24617912 EL, 2.2?F, ±10%, 50V C306 24073042 EL, 1000?F, ±20%, 16V C307 24082047 PF, 0.033?F, 100V C308 24668101 EL, 100?F, ±20%, 35V C309 24591102 PF, 1000pF C310 24796102 EL, 1000?F, ±20%, 35V C311 24214221 CD, 220pF, ±10%, 500V C313 24693472 PF, 4700pF, 100V C314 24591563 PF, 0.056?F C315 24797229 EL, 2.2?F, ±20%, 50V C317 24214471 CD, 470pF, ±10%, 500V C403 24591203 PF, 0.02?F C404 24797229 EL, 2.2?F, ±20%, 50V C417 24214391 CD, 390pF, ±10%, 500V C421 24591334 PF, 0.33?F C422 24591334 PF, 0.33?F C431 24794470 EL, 47?F, ±20%, 16V

* C440 24082929 PF, 6800pF, ±3%, 1500V * C442 24082694 PF, 0.33?F, 250V

C445 24828223 PF, 0.022?F, 200V C446 24700100 EL, 10?F, ±20%, 250V C448 24640908 EL, 33?F, ±20%, 160V

Part No. Description

Location

No.

C449 24794102 EL, 1000?F, ±20%, 16V C463 24212152 CD, 1500pF, ±10% C471 24797479 EL, 4.7?F, ±20%, 50V C474 24794100 EL, 10?F, ±20%, 16V C504 24353090 CD, 9pF, ±0.25pF, CH C510 24797229 EL, 2.2?F, ±20%, 50V C514 24591223 PF, 0.022?F C607 24794102 EL, 1000?F, ±20%, 16V C609 24591103 PF, 0.01?F C610 24794220 EL, 22?F, ±20%, 16V C611 24539104 PF, 0.1?F C613 24794471 EL, 470?F, ±20%, 16V C614 24797478 EL, 0.47?F, ±20%, 50V C801 24095852 PF, 0.082?F, ±20%, AC125V C807 24790100 EL, 10?F, ±20%, 160V C808 24214472 CD, 4700pF, ±10%, 500V C810 24086862 EL, 470?F, ±20%, 200V C819 24766478 EL, 0.47?F, ±20%, 50V C832 24793470 EL, 47?F, ±20%, 10V C840 24679330 EL, 33?F, ±20%, 250V C843 24666100 EL, 10?F, ±20%, 16V C902 24211102 CD, 1000pF, ±10%, 2kV C921 24212681 CD, 680pF, ±10% C922 24212681 CD, 680pF, ±10% C923 24212681 CD, 680pF, ±10% CA28 24472100 CD, 10pF CA29 24472100 CD, 10pF CA33 24232103 CD, 0.01?F, +80%, -20% CA36 24474101 CD, 100pF, ±10% CA37 24474101 CD, 100pF, ±10% CA38 24474101 CD, 100pF, ±10% CA42 24794100 EL, 10?F, ±20%, 16V CA43 24232103 CD, 0.01?F, +80%, -20% CA68 24794100 EL, 10?F, ±20%, 16V CA69 24232103 CD, 0.01?F, +80%, -20% CB01 24794470 EL, 47?F, ±20%, 16V CB20 24474101 CD, 100pF, ±10% CR01 24797478 EL, 0.47?F, ±20%, 50V CR02 24797478 EL, 0.47?F, ±20%, 50V CR03 24797478 EL, 0.47?F, ±20%, 50V CS02 24797229 EL, 2.2?F, ±20%, 50V

Part No. Description

– 19 –

Location

No.

Part No. Description

Location

No.

Part No. Description

CS03 24797478 EL, 0.47?F, ±20%, 50V CS11 24797478 EL, 0.47?F, ±20%, 50V CT63 24591223 PF, 0.022?F CV06 24797478 EL, 0.47?F, ±20%, 50V

RESISTORSRESISTORS

RESISTORS

RESISTORSRESISTORS

R101 24382153 OMF, 15k ohm, 1W R201 24552391 OMF, 390 ohm, 1/2W R208 24366124 CF, 120k ohm R218 24366154 CF, 150k ohm R227 24366153 CF, 15k ohm R230 24366223 CF, 22k ohm

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

R233 24366152 CF, 1500 ohm R235 24366154 CF, 150k ohm R236 24366101 CF, 100 ohm R237 24366101 CF, 100 ohm R238 24366332 CF, 3300 ohm R239 24366152 CF, 1500 ohm R241 24366433 CF, 43k ohm R242 24366473 CF, 47k ohm R245 24366184 CF, 180k ohm R246 24366225 CF, 2.2M ohm R247 24366471 CF, 470 ohm R301 24366102 CF, 1k ohm R303 24366102 CF, 1k ohm R304 24366683 CF, 68k ohm R305 24322109 MF, 1 ohm, 1W R306 24366753 CF, 75k ohm R307 24366914 CF, 910k ohm R312 24381152 OMF, 1500 ohm, 1/2W R313 24366184 CF, 180k ohm R317 24366333 CF, 33k ohm R327 24338829 MF, 8.2 ohm, 1W R336 24383271 OMF, 270 ohm, 2W R337 24366223 CF, 22k ohm R338 24366223 CF, 22k ohm R401 24366391 CF, 390 ohm R402 24366103 CF, 10k ohm R403 24366332 CF, 3300 ohm R405 24553392 OMF, 3900 ohm, 1W R406 24366333 CF, 33k ohm R407 24366223 CF, 22k ohm R410 24366391 CF, 390 ohm R411 24366561 CF, 560 ohm R412 24366560 CF, 56 ohm R414 24383222 OMF, 2200 ohm, 2W R416 24510182 Cement, 1800 ohm, 5W R430 24366102 CF, 1k ohm R431 24366103 CF, 10k ohm R432 24366222 CF, 2200 ohm R448 24338828 MF, 0.82 ohm, 1W R472 24376270 CF, 27 ohm, 1/2W

* R475 24367101 CF, 100 ohm, ±2%

R476 24366823 CF, 82k ohm R477 24366223 CF, 22k ohm

* R478 24327133 MF, 13k ohm, ±1%, 1/4W

R481 24366333 CF, 33k ohm

* R482 24327512 MF, 5100 ohm, ±1%, 1/4W

R495 24383222 OMF, 2200 ohm, 2W R496 24383182 OMF, 1800 ohm, 2W R503 24366334 CF, 330k ohm R504 24366332 CF, 3300 ohm R513 24366332 CF, 3300 ohm R514 24366332 CF, 3300 ohm

R602 24532100 FR, 10 ohm, 1W R603 24366391 CF, 390 ohm R604 24366182 CF, 1800 ohm R605 24366339 CF, 3.3 ohm R802 24376224 CF, 220k ohm, 1/2W R803 24553123 OMF, 12k ohm, 1W R804 24002000 CC, 3.9M ohm, ±10%, 1/2W R806 24552560 OMF, 56 ohm, 1/2W R808 24000269 PTC Thermistor, 7 ohm,

±20%, AC140V

R810 24568229 Cement, 2.2 ohm, 7W R811 24007851 Cement, 200 ohm, 15W R812 24510120 Cement, 12 ohm, 5W R816 24366471 CF, 470 ohm R818 24366561 CF, 560 ohm R819 24366102 CF, 1k ohm R830 24381330 OMF, 33 ohm, 1/2W R831 24366681 CF, 680 ohm R841 24568752 Cement, 7500 ohm, 7W R845 24384123 OMF, 12k ohm, 3W R847 24366392 CF, 3900 ohm R848 24366103 CF, 10k ohm R897 24019472 Varistor, ENE271D-10A2 R899 24019472 Varistor, ENE271D-10A2 R901 24376472 CF, 4700 ohm, 1/2W R902 24376472 CF, 4700 ohm, 1/2W R903 24376472 CF, 4700 ohm, 1/2W R911 24366101 CF, 100 ohm R912 24366101 CF, 100 ohm R913 24366101 CF, 100 ohm R920 24000880 FR, 5.1 ohm, 1W R921 24366331 CF, 330 ohm R922 24366331 CF, 330 ohm R923 24366331 CF, 330 ohm R931 24366102 CF, 1k ohm R932 24366102 CF, 1k ohm R933 24366102 CF, 1k ohm R961 24554183 OMF, 18k ohm, 2W R962 24554183 OMF, 18k ohm, 2W R963 24554183 OMF, 18k ohm, 2W R971 24366821 CF, 820 ohm R972 24366102 CF, 1k ohm R973 24366391 CF, 390 ohm R974 24366221 CF, 220 ohm RA03 24366102 CF, 1k ohm RA07 24366102 CF, 1k ohm RA14 24366102 CF, 1k ohm RA16 24366102 CF, 1k ohm RA17 24366102 CF, 1k ohm RA18 24366102 CF, 1k ohm RA22 24366472 CF, 4700 ohm RA23 24366472 CF, 4700 ohm RA24 24366472 CF, 4700 ohm RA25 24366682 CF, 6800 ohm RA26 24366102 CF, 1k ohm RA27 24366102 CF, 1k ohm RA33 24366103 CF, 10k ohm RA35 24366102 CF, 1k ohm RA36 24366103 CF, 10k ohm RA37 24366331 CF, 330 ohm RA38 24366331 CF, 330 ohm RA61 24366103 CF, 10k ohm RA62 24366103 CF, 10k ohm RA67 24366103 CF, 10k ohm

– 20 –

Location

No.

Part No. Description

Location

No.

Part No. Description

RA68 24366103 CF, 10k ohm RA70 24366333 CF, 33k ohm RA71 24366683 CF, 68k ohm RA72 24366223 CF, 22k ohm RA73 24366103 CF, 10k ohm RA74 24366101 CF, 100 ohm RA75 24366101 CF, 100 ohm RB03 24366101 CF, 100 ohm RB09 24366470 CF, 47 ohm RB26 24366472 CF, 4700 ohm RB27 24366103 CF, 10k ohm RB28 24366104 CF, 100k ohm RB30 24366103 CF, 10k ohm RB33 24366102 CF, 1k ohm RB43 24366103 CF, 10k ohm RB44 24366682 CF, 6800 ohm RB45 24366221 CF, 220 ohm RR90 24366102 CF, 1k ohm RR91 24366102 CF, 1k ohm RR92 24366102 CF, 1k ohm RR93 24366472 CF, 4700 ohm RT61 24366332 CF, 3300 ohm RT63 24366102 CF, 1k ohm RV01 24366680 CF, 68 ohm

COILS & TRANSFORMERSCOILS & TRANSFORMERS

COILS & TRANSFORMERS

COILS & TRANSFORMERSCOILS & TRANSFORMERS

L101 23289220 Coil, Peaking, TRF4220AF L203 23289846 Coil, Peaking, TRF4101AT L301 23103880 Coil (Ferrite Bead), TEM2011Y

L410 23103880 Coil (Ferrite Bead), TEM2011Y * L462 23231292 Deflection Yoke, TDY-320UG * L901 23200338 Coil, Degaussing, TSB-2100CP

LA01 23289100 Coil, Peaking, TRF4100AF

LB01 23289470 Coil, Peaking, TRF4470AF

T401 23224983 Transformer, Horiz. Drive,

* T461 23236614 Transformer, Flyback,

T801 23211696 Line, Filter, TRF3216AK

SEMICONDUCTORSSEMICONDUCTORS

SEMICONDUCTORS

SEMICONDUCTORSSEMICONDUCTORS

Q301 B0377890 IC, TA8403K

Q301B 72471082 Screw, BRDT2W3X10 SZN

Q402 A6330069 Transistor, 2CS2482 FA-1

Q404 A6873824 Transistor, 2SD2599

Q404B 72471082 Screw, BRDT2W3X10 SZN

Q421 23905952 IC, MC7809BT

Q471 23114530 Transistor, 2SA933S-Q

Q472 23114528 Transistor, 2SC1740S, Q

Q501 B0385424 IC, TA1223AN

Q610 23119668 IC, TDA2611A * Q801 23114420 IC, STR30134

Q801B 70391356 Screw, BITTB3X10 SZN

Q817 23114528 Transistor, 2SC1740S, Q

Q818 A6012010 Transistor, RN2201

Q819 23114528 Transistor, 2SC1740S, Q

Q830 23114552 Transistor, 2SC1685-Q, TH

Q843 A6330059 Transistor, 2SC2482(C)

Q901 A6330059 Transistor, 2SC2482(C)

Q902 A6330059 Transistor, 2SC2482(C)

Q903 A6330059 Transistor, 2SC2482(C)

Q971 A6534040 Transistor, 2SA1015-Y

QA01 23000286 IC, TMPA8700CKN-1A04

QA02 70129473 IC, AT24C01A10PC

TLN1039

TFB4139AD

QB03 A6002050 Transistor, RN1205 QB21 23114528 Transistor, 2SC1740S, Q QB30 23114528 Transistor, 2SC1740S, Q QB33 70119743 IC, PST523D QB40 23114528 Transistor, 2SC1740S, Q D101 23316411 Diode, Zener, HZT33-12 D201 23316656 Diode, Zener, MTZJ3.3A D204 23118859 Diode, 1SS133 D205 23118859 Diode, 1SS133 D210 23118859 Diode, 1SS133 D301 A7568460 Diode, TVR-1B D302 23118095 Diode, ERB44-06, E D406 23118095 Diode, ERB44-06, E D408 23118052 Diode, RU4Z LF-L1 D410 23316688 Diode, Zener, MTZJ9.1C D441 23316687 Diode, Zener, MTZJ9.1B D445 23118479 Diode, BYD33J D471 A7568460 Diode, TVR-1B

* D472 23316782 Diode, Zener, MTZJ6.2C

D801 A7568754 Diode, 1S1887A FA-1 D802 A7568754 Diode, 1S1887A FA-1 D803 A7568754 Diode, 1S1887A FA-1 D804 A7568754 Diode, 1S1887A FA-1 D830 23316673 Diode, Zener, MTZJ5.6C D840 A7568752 Diode, 1S1887A, FA D841 A7568752 Diode, 1S1887A, FA D842 23316678 Diode, Zener, MTZJ6.8B D843 23316671 Diode, Zener, MTZJ5.6A D845 23118486 Diode, ERA15-02, G1 DB03 23358522 Diode (LED), SIR-56SB3F DB30 23118859 Diode, 1SS133

MISCELLANEOUSMISCELLANEOUS

MISCELLANEOUS

MISCELLANEOUSMISCELLANEOUS

E502 23451933 Rubber Wedge F301 23144727 Fuse, 0.4A F301A 23165433 Holder, Fuse F470 23144495 Fuse, 0.8A F470A 23165433 Holder, Fuse F801 23144888 Fuse, 5.0A, 125V F801A 23165433 Holder, Fuse F802 23144785 Fuse, 1.25A, 125V F802A 23165433 Holder, Fuse G060 24366101 CF, 100 ohm G411 23103880 Coil (Ferrite Bead), TEM2011Y G885 23248031 Coil, Choke, TLN3274D G903 23118859 Diode, 1SS133 P001 23142041 Terminal, Antenna Shield P801 23372112 Power Cord SA01 23145227 Switch, Push, 1C1P SA02 23145227 Switch, Push, 1C1P SA03 23145227 Switch, Push, 1C1P SA04 23145227 Switch, Push, 1C1P SA05 23145227 Switch, Push, 1C1P SA07 23145227 Switch, Push, 1C1P SR81 23146566 Relay, DC48V

* V901A 23902970 Socket, CRT, 8P

V901M 23102462 Magnet, Purity-Convergence,

W661 23351157 Speaker, SPK-1399,

X401 23153721 Ceramic Resonator, 503kHz,

X501 23153961 Crystal, 3.58MHz

MAG-1104

50x90mm, 8 ohm

TCR1023

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

– 21 –

Location

No.

Part No. Description

Location

No.

Part No. Description

XA01 23153504 Ceramic Resonator, 8.00MHz,

Z001 23134187 CR-GAP, CRA112G

PC BOARD ASSEMBLIESPC BOARD ASSEMBLIES

PC BOARD ASSEMBLIES

PC BOARD ASSEMBLIESPC BOARD ASSEMBLIES

M051Z Main Board, PB9391A-1

*

M052Z CRT Drive Board, PB9391A-2

*

PICTURE TUBEPICTURE TUBE

PICTURE TUBE

PICTURE TUBEPICTURE TUBE

* V901 23312676 Picture Tube, A48KZL70X(LW)

TUNERTUNER

TUNER

TUNERTUNER

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

H001 23321369 Tuner, EL953L

ACCESSORIESACCESSORIES

ACCESSORIES

ACCESSORIESACCESSORIES

K912 23306309 Remote Hand Unit, CT-9988

AT03 23588409 Battery Cover

Y101 23563888 Owner’s Manual, English,

Y101F 23563889 Owner’s Manual, French,

CABINET PARTSCABINET PARTS

CABINET PARTS

CABINET PARTSCABINET PARTS

A201 23549157 Front Cover

A224 23445231 Button, Control

A411 23549244 Back Cover

A701 23524655 Carton Box

A703 23935858 Packing, Top

A708 23935859 Packing, Bottom

TCR1056BM

19A20

– 22 –

MAIN BOARD PB9391-1

BOTTOM (FOIL) SIDE

– 23 – – 24 –

CRT-D DRIVE BOARD PB9391-2

E

C

B B

C

E

C

B

BOTTOM (FOIL) SIDE

TERMINAL VIEW OF TRANSISTORS

1 2SD2253

(old)

2SC5243

6 RN2203

RN2201 RN2004 RN1203 RN1204 RN2204 RN1205 RN1202 RN1201

2 2SC3852

2SD1763A 2SC1569 2SC4544 2SA1788 2SA1306 2SA1186A

B

C

E

7 2SD1554

2SD2253 2SD1556 2SC5143 2SD2553

B

C

E

3 2SC752GTM

2SC2482 2SC2655 2SC4721P

E

C

B

8 ON4409

B

C

E

4 2SC752

2SA562TM 2SA1015 2SC1815 2SC2878 2SC1740S 2SC2120 2SA9335

E

C

B

5 2SA1788

– 25 –

– 26 –

MEMO

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

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

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

– 27 –

MEMO

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

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

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

– 28 –

SPECIFICATIONS

TELEVISION SYSTEM NTSC standard CHANNEL COVERAGE VHF; 2 through 13

UHF; 14 through 69 Cable TV; mid band (A-8 through A-1, A through I)

super band (J through W) hyper band (AA through ZZ, AAA, BBB)

ultra band (65 through 94, 100 through 125) POWER SOURCE 120V AC, 60Hz POWER CONSUMPTION 61 W (average) AUDIO POWER 1W SPEAKER TYPE 2 x 3-1/2 inches (50 x 90mm)

DIMENSIONS Width ....................... 20-5/32 inches (512mm)

Height......................17-29/32 inches (454mm)

Depth ...................... 18-1/2 inches (470mm)

MASS 37.9 lbs (17.2kg) SUPPLIED ACCESSORIES Remote Control with 2 size “AA” batteries

GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS

*Please refer to owner's manual in detail.

– 29 –

TOSHIBA CORPORATION

1-1, SHIBAURA 1- CHOME, MINATO-KU, TOKYO 105-8001, JAPAN

Toshiba 14AS20 Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual