Toshiba 19A20 Service Manual Download Page 21

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GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

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 & 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,
TLN1039

* T461

23236614

Transformer, Flyback,
TFB4139AD

T801

23211696

Line, Filter, TRF3216AK

SEMICONDUCTORS

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

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

MISCELLANEOUS

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,
MAG-1104

W661

23351157

Speaker, SPK-1399,
50x90mm, 8 ohm

X401

23153721

Ceramic Resonator, 503kHz,
TCR1023

X501

23153961

Crystal, 3.58MHz

Summary of Contents for 19A20

Page 1: ...TOSHIBA CORPORATION 1 1 SHIBAURA 1 CHOME MINATO KU TOKYO 105 8001 JAPAN FILE NO 020 200003 SERVICE MANUAL COLOR TELEVISION N0E Chassis 19A20 PRINTED IN U S A Mar 2000 U TAC0001 ...

Page 2: ...DE 8 DESIGN MODE 11 ELECTRICAL ADJUSTMENTS 12 CIRCUIT CHECKS 14 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 SPECIFICATIONS 29 APPENDIX CIRCUIT DIAGRAM ...

Page 3: ...mp AC Any value exceeding this limit consti tutes a potential shock hazard and must be corrected im mediately WARNING Service should not be attempted by anyone unfa miliar with the necessary precautions on this receiver The fol lowing are the necessary precautions to be observed before servicing this chassis 1 An isolation Transformer should be connected in the power line between the receiver and ...

Page 4: ...magnet GLASS CLOTH TAPES DEFLECTION YOKE TEMPORARY MOUNTING RUBBER WEDGE ADHESIVE DEFLECTION YOKE PURITY CONVERGENCE MAGNET ASS Y 14mm 13 14 19mm 19 20 Figure 1 COLOR PURITY ADJUSTMENT NOTE Before attempting any purity adjustments the receiver should be operated for at least fifteen minutes 1 Demagnetize the picture tube and cabinet using a degauss ing coil 2 Set the brightness and contrast to max...

Page 5: ...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 conver g...

Page 6: ...form green screen is obtained Tighten the clamp screw 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 p...

Page 7: ...t movement com plex 7 After completing the CENTER CONVERGENCE AD JUSTMENT tighten the tightening ring to fix the mag nets Figure 3 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 BLU BLU RED RED 6 POLE MAGNETS MOVEMENT 4 POLE MAGNETS MOVEMENT RED BLUE RED BLUE GRN GRN Center ...

Page 8: ...ustment 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 select...

Page 9: ...ove 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 Normal picture Black cross bar on green raster Red raster H signal black H signal white Green raster Blue raster Whi...

Page 10: ... 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 5 Sync signal check Green display Normal Cyan display No check Red display NG UV TV mode V1 VIDEO 1 mode V2 VIDEO 2 mode 9 SELF DIAGNOSTIC ...

Page 11: ...gn 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 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 ...

Page 12: ... 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 1V0 p of blue bar 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 25V0 p of blue bar on scope 10 Check the picture with off air signal HORI...

Page 13: ...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 color...

Page 14: ...GHTNESS and CON TRAST 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 4 Vary the BRIGHTNESS control to both extremes to be sure the high voltage does not exceed the limit under any con ditions FS CIRCUIT CHECK The Fail Safe FS circuit check is indispensable for the final check in servicing Ch...

Page 15: ...30H 30H 30H 80H 80H 50H 38H 2CH 42H 19H 02H 1EH SERVICE MODE ADJUSTING ITEMS AND DATAS IN THE SERVICE MODE Table 2 CHAPTER 2 SPECIFIC INFORMATIONS SAFETY INSTRUCTIONS These adjustments may be required when replacing QA02 and Q501 19 HIGH VOLTAGE AT ZERO BEAM A 24 7 kV MAX HIGH VOLTAGE B 26 1 kV Table 1 DESIGN MODE ADJUSTING ITEMS AND DATAS IN THE DESIGN MODE Data Item Name of adjustment Preset Dat...

Page 16: ...TN TV VIDEO POWER RECALL MUTE MENU EXIT CH VOL CH VOL VOLUME MENU POWER CHANNEL Remote sensor TV VIDEO button VOLUME T S button Menu T S button CHANNEL s t buttons Menu s t buttons MENU button RECALL button POWER button Channel Number button RTN button MUTE button EXIT button Front Remote Control ...

Page 17: ...ng TheTVwillautomaticallycyclethroughalltheTVorCABLE 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...

Page 18: ...ER 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 BLO...

Page 19: ...32 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 C31...

Page 20: ...383222 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 PT...

Page 21: ...nsistor 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 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...

Page 22: ...ICTURE TUBE PICTURE TUBE PICTURE TUBE V901 23312676 Picture Tube A48KZL70X LW TUNER TUNER TUNER TUNER TUNER H001 23321369 Tuner EL953L ACCESSORIES ACCESSORIES ACCESSORIES ACCESSORIES ACCESSORIES K912 23306309 Remote Hand Unit CT 9988 AT03 23588409 Battery Cover Y101 23563888 Owner s Manual English 19A20 Y101F 23563889 Owner s Manual French 19A20 CABINET PARTS CABINET PARTS CABINET PARTS CABINET PA...

Page 23: ... 23 24 MAIN BOARD PB9391 1 BOTTOM FOIL SIDE ...

Page 24: ...63A 2SC1569 2SC4544 2SA1788 2SA1306 2SA1186A 3 2SC752GTM 2SC2482 2SC2655 2SC4721P 4 2SC752 2SA562TM 2SA1015 2SC1815 2SC2878 2SC1740S 2SC2120 2SA9335 5 2SA1788 6 RN2203 RN2201 RN2004 RN1203 RN1204 RN2204 RN1205 RN1202 RN1201 E C B B C E BCE B CE B C E E C B 8 ON4409 7 2SD1554 2SD2253 2SD1556 2SC5143 2SD2553 E C B B C E ...

Page 25: ... 27 GENERAL ADJUSTMENTS SPECIFIC INFORMATIONS MEMO ...

Page 26: ... 28 GENERAL ADJUSTMENTS SPECIFIC INFORMATIONS MEMO ...

Page 27: ...ough 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 Please refer to owner s manual i...

Page 28: ...TOSHIBA CORPORATION 1 1 SHIBAURA 1 CHOME MINATO KU TOKYO 105 8001 JAPAN FILE NO 020 200003 SERVICE MANUAL COLOR TELEVISION N0E Chassis 19A20 PRINTED IN U S A Mar 2000 U TAC0001 ...

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