Toshiba 19A20 Service Manual Download Page 18 | Manualshive

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GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

CIRCUIT BLOCK DIAGRAM

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

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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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