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Toshiba 27A30, Service Manual

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Toshiba 27A30 Service Manual Download Page 41

Summary of Contents for 27A30

Page 1: ...e circuitos Capítulo 2 Información específica Fijación y ajuste de datos Localización de controles Programando la memoria de canales Diagrama a bloques del circuito Reemplazo del gabinete y del chasis Vista inferior de las placas de circuito impreso Vista de terminales de transistores Especificaciones Diagrama esquemático Seguridad Principal Televisión a color ...

Page 2: ...TOSHIBA CORPORATION 1 1 SHIBAURA 1 CHOME MINATO KU TOKYO 105 8001 JAPAN FILE NO 020 200008 SERVICE MANUAL COLOR TELEVISION N0ES Chassis 27A30 TAC0006 PUBLISHED IN JAPAN May 2000 S ...

Page 3: ...DE 8 DESIGN MODE 11 ELECTRICAL ADJUSTMENTS 12 CIRCUIT CHECKS 16 CHAPTER 2 SPECIFIC INFORMATIONS SETTING ADJUSTING DATA 17 LOCATION OF CONTROLS 18 PROGRAMMING CHANNEL MEMORY 20 CIRCUIT BLOCK DIAGRAM 21 CHASSIS AND CABINET REPLACEMENT PARTS LIST 22 PC BOARDS BOTTOM VIEW 27 TERMINAL VIEW OF TRANSISTORS 30 SPECIFICATIONS 33 APPENDIX CIRCUIT DIAGRAM ...

Page 4: ...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 5: ...SS 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 maximum 3 Use...

Page 6: ...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 7: ...RIGHTNESS Controls to the maximum 3 Display built in green raster using the TEST SIGNAL SELECTION function 4 Loosen the clamp screw holding the deflection yoke and remove the Rubber Wedges 5 Slide the yoke forward or backward to provide vertical green belt zone in the picture screen 6 Rotate and spread the tabs of the purity magnet See figure 4 around the neck of the picture tube until the green b...

Page 8: ...ing 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 Convergence by Convergence Magnets ...

Page 9: ...menu provides special functions A single horizontal line ON OFF TV ANT VIDEO button on TV 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 diagnos...

Page 10: ... Programming Channel Memory on the owner s manual 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...

Page 11: ...ter 000 is normal 3 BUS line check OK 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 4 BUS line ACK acknowledge check 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 th...

Page 12: ...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 17 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 13: ... contrast 6 Adjust the HEIGHT control SUB COLOR COLC SUB TINT TNTC 1 Receive color bar signal from color bar generator 2 Press the RESET button 3 Connect oscilloscope to base of Q906 on CRT D board 4 Enter the service mode then select COLC 5 Adjust the SUB COLOR by pressing the VOLUME s or t button to achieve about 1V0 p of blue bar 6 Select TNTC register 7 Adjust the data value to obtain the blue...

Page 14: ...DRV 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 on Remote until the white and black pattern appears on the screen 3 Adjust the following item with the CHANNEL s t and VOLUME s t buttons 4 Press the TV VIDEO button on TV to display a single horizontal line on the screen 5 Turn the SCREEN contro...

Page 15: ... data becomes in the center of range for STA7 0 and STA8 1 STEREO FILTER STRF 4 9 4kHz 600mVrm pin 9 of H002 Monaural signal ANT 1 Display item STRF on screen 2 Change data by VOLUME s t buttons so that the data becomes in the center of range for STA3 1 SAP FILTER SAPF 5 88kHz 120mVrms pin 9 of H002 Monaural signal ANT 1 Display item SAPF 2 Change data by VOLUME s t buttons so that the data become...

Page 16: ...nnect oscilloscope to pin 34 of QG01 4 Change data by VOLUME s t buttons to minimize AC output level on scope 5 Resolder SL02 H001 QG01 SL02 CG44 RG44 CG07 15 734kHz 30mV rms RG43 10 7 1 STEREO 300Hz R channel only ANT 1 Display item WBAN on screen 2 Connect oscilloscope to pin 35 of QG01 3 Change data by VOLUME s t buttons so that 300Hz element on scope becomes minimum STEREO 3kHz R channel only ...

Page 17: ...IGHTNESS 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 17 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 C...

Page 18: ...OR SUB TINT SAP VCO ATTENUATOR STEREO VCO STEREO FILTER SPECTRAL STEREO SEPARATION HORIZ POSITION RCUT GCUT BCUT GDRV BDRV CNTX BRTC COLC TNTC SAVC ATT STVC STRF SPEC WBAN HPOS Preset Data 40H 40H 40H 80H 80H 50H 40H 2CH 42H 20H 20H 20H 20H 20H 20H 16H Item Name of adjustment VERT POSITION HEIGHT VPOS HIT Preset Data 02H 20H 25H Table 2 DESIGN MODE ADJUSTING ITEMS AND DATA IN THE DESIGN MODE CIRCU...

Page 19: ...MENTS SPECIFIC INFORMATIONS MENU TV VIDEO VOLUME CHANNEL POWER TV front TV VIDEO VOLUME T S CHANNEL s t T S t s POWER POWER indicator Remote sensor MENU LOCATION OF CONTROLS TV rear ANT INPUT TERMINAL A V INPUT TERMINAL ...

Page 20: ...NTS SPECIFIC INFORMATIONS 1 2 3 4 5 6 7 8 9 100 0 CH RTN TV VIDEO POWER RECALL MUTE MENU EXIT CH VOL CH VOL TV VIDEO MUTE RECALL VOLUME T S Menu T S EXIT CHANNEL s t Menu s t POWER MENU CH RTN Channel Number Remote Control ...

Page 21: ... is displayed in purple 3 Press T or S 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 4 When channel programming is complete you will see the message on the screen 5 Press CHANNEL s or t to make sure the channel programming has been done properly ADD ERASE function Afte...

Page 22: ... 21 GENERAL ADJUSTMENTS SPECIFIC INFORMATIONS CIRCUIT BLOCK DIAGRAM ...

Page 23: ...100 EL 10 F 20 16V C234 24436150 CD 15pF C301 24617912 EL 2 2 F 10 50V C302 24212152 CD 1500pF 10 C305 24617915 EL 1 F 10 50V C306 24073058 EL 2200 F 20 25V C307 24693333 PF 0 033 F 100V C308 24668221 EL 220 F 20 35V C309 24591102 PF 1000pF C310 24796102 EL 1000 F 20 35V C311 24214101 CD 100pF 10 500V C313 24082057 PF 0 22 F 100V C314 24591563 PF 0 056 F C315 24797229 EL 2 2 F 20 50V C317 24214471...

Page 24: ...L 4 7 F 20 50V CG27 24591223 PF 0 022 F CG28 24797229 EL 2 2 F 20 50V CG29 24591102 PF 1000pF CG30 24206108 EL 0 1 F 20 50V CG31 24797229 EL 2 2 F 20 50V CG32 24591102 PF 1000pF CG33 24206108 EL 0 1 F 20 50V CG38 24206229 EL 2 2 F 20 50V CG39 24206229 EL 2 2 F 20 50V CG42 24797010 EL 1 F 20 50V CG44 24794100 EL 10 F 20 16V CG46 24794100 EL 10 F 20 16V CM05 24212101 CD 100pF 10 CM08 24539104 PF 0 1...

Page 25: ...4376102 CF 1k ohm 1 2W R911 24366561 CF 560 ohm R912 24366561 CF 560 ohm R913 24366561 CF 560 ohm R920 24000961 FR 2 2 ohm 2W R921 24366271 CF 270 ohm R922 24366271 CF 270 ohm R923 24366271 CF 270 ohm R931 24366102 CF 1k ohm R932 24366102 CF 1k ohm R933 24366102 CF 1k ohm R961 24554153 OMF 15k ohm 2W R962 24554153 OMF 15k ohm 2W R963 24554153 OMF 15k ohm 2W R971 24366821 CF 820 ohm R972 24366102 C...

Page 26: ...552 Transistor 2SC1685 Q TH Q840 23318299 IC L78MR05 Q843 A6002050 Transistor RN1205 Q862 A8643135 Photo Coupler TLP621 GRL Q883 A6907894 IC S1854A FA4 Q901 A6363200 Transistor 2CS3619 Q902 A6363200 Transistor 2CS3619 Q903 A6363200 Transistor 2CS3619 Q904 23114528 Transistor 2SC1740S Q Q905 23114528 Transistor 2SC1740S Q Q906 23114528 Transistor 2SC1740S Q Q971 23114530 Transistor 2SA933S Q QA01 2...

Page 27: ... 23145227 Switch Push 1C1P SR81 23146564 Relay DC12V V901A 23902068 Socket CRT 10P W661 23151225 Speaker SPK 1228 60X90 8 ohm W662 23151225 Speaker SPK 1228 60X90 8 ohm X401 23153721 Ceramic Resonator 503kHz TCR1023 X501 23153961 Crystal 3 58MHz XA01 23153504 Ceramic Resonator 8 00MHz TCR1056BM PC BOARD ASSEMBLIES PC BOARD ASSEMBLIES PC BOARD ASSEMBLIES PC BOARD ASSEMBLIES PC BOARD ASSEMBLIES M051...

Page 28: ... 27 28 MAIN BOARD PB9416 1 BOTTOM FOIL SIDE ...

Page 29: ...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 7 2SD1554 2SD2253 2SD1556 2SC5143 2SD2553 2SD2539 E C B B C E B CE BCE B C E E C B E C B 8 ON4409 B C E ...

Page 30: ... 31 GENERAL ADJUSTMENTS SPECIFIC INFORMATIONS MEMO ...

Page 31: ... 32 GENERAL ADJUSTMENTS SPECIFIC INFORMATIONS MEMO ...

Page 32: ...0 through 125 POWER SOURCE 120V AC 60Hz POWER CONSUMPTION 79W average AUDIO POWER 2W 2W SPEAKER TYPE Two 2 3 8 x 3 9 16 inches 60 x 90 mm VIDEO AUDIO TERMINALS VIDEO AUDIO INPUT VIDEO 1V p p 75 ohm negative sync AUDIO 150mV rms 30 modulation equivalent 47k ohm DIMENSIONS Width 25 63 64 inches 660mm Height 24 19 64 inches 617mm Depth 22 inches 558 5mm MASS 74 3 lbs 33 7 kg SUPPLIED ACCESSORIES Remo...

Page 33: ...TOSHIBA CORPORATION 1 1 SHIBAURA 1 CHOME MINATO KU TOKYO 105 8001 JAPAN FILE NO 020 200008 SERVICE MANUAL COLOR TELEVISION N0ES Chassis 27A30 TAC0006 PUBLISHED IN JAPAN May 2000 S ...

Page 34: ...1 000 M 1 000 000 All resistors are 1 6W and 5 tolerance carbon resistor unless otherwise noted as the following marks 1 2R Metal or Metal oxide of 1 2 watt 1 2S Carbon compsistion of 1 2 watt 1RF Fuse resistor of 1 watt 10W Cement of 10 watt K 10 G 2 F 1 2 CAPACITOR Unless otherwise noted in schematic all capacitor values less than 1 are expressed in F and the values more than 1 in pF All capacit...

Page 35: ... with DIGITAL MULTI METER from point indicated to chassing ground using a color bar signal with all controls at normal line voltage 120 volts 5 Waveforms are taken receiving color bar signal with enough sensitivity 6 Voltage reading shown are nominal values and may vary 20 except H V NOTE 1 RESISTOR Resistance is shown in ohm K 1 000 M 1 000 000 All resistors are 1 6W and 5 tolerance carbon resist...

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