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Toshiba 27A30 Service Manual

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27A30
Televisión a color
Tabla de contenidos
Capítulo 1: Ajustes generales
Ins trucciones de seguridad
Ajus tes iniciales
Modo de ser vicio
Modo de dise ño
Ajus tes eléctricos
R evisión de circuitos
Capítulo 2: Información específica.
F ijación y ajuste de datos
Localizaci ón de controles
Pr ogramando la memoria de canales
Diag rama a bloques del circuito
R eemplazo del gabinete y del chasis
V ista inferior de las placas de circuito impreso
V ista de terminales de transistores
Especificaciones
Diagrama esquemático
Segur idad
Pr incipal

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Summary of Contents for Toshiba 27A30

  • Page 1 Televisión a color Tabla de contenidos Capítulo 1: Ajustes generales Ins trucciones de seguridad 27A30 Ajus tes iniciales Modo de ser vicio Modo de dise ño Ajus tes eléctricos R evisión de circuitos Capítulo 2: Información específica. F ijación y ajuste de datos Localizaci ón de controles...

  • Page 2: Service Manual

    FILE NO. 020-200008 SERVICE MANUAL COLOR TELEVISION N0ES Chassis 27A30 (TAC0006) PUBLISHED IN JAPAN, May, 2000 S...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS CHAPTER 1 GENERAL ADJUSTMENTS SAFETY INSTRUCTIONS ............................3 SET-UP ADJUSTMENT ............................4 SERVICE MODE ..............................8 DESIGN MODE ..............................11 ELECTRICAL ADJUSTMENTS ..........................12 CIRCUIT CHECKS ..............................16 CHAPTER 2 SPECIFIC INFORMATIONS SETTING & ADJUSTING DATA ..........................17 LOCATION OF CONTROLS ...........................

  • Page 4: Chapter 1 General Adjustments

    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 hazard- 2. This receiver is equipped with a Fail Safe (FS) circuit which ous X-RAY RADIATION.

  • Page 5: Set-Up Adjustment

    WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU- TION” 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.
  • Page 6 CONVERGENCE ADJUSTMENTS CIRCUMFERENCE CONVERGENCE ADJUSTMENT NOTE: Before attempting any convergence adjustments, the 1. Loosen the clamping screw of deflection yoke slightly to receiver should be operated for at least fifteen min- allow the yoke to tilt. utes. 2. Temporarily put a wedge as shown in figure 1. (Do not remove cover paper on adhesive part of the wedge.) CENTER CONVERGENCE ADJUSTMENT 3.
  • Page 7 WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU- TION” AND “PRODUCT SAFETY NOTICE” ON PAGE 3 OF THIS MANUAL. (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.
  • Page 8 CONVERGENCE ADJUSTMENTS 4-POLE NOTE: Before attempting any convergence adjustments, MAGNETS the receiver should be operated for at least fifteen 6-POLE minutes. MAGNETS CENTER CONVERGENCE ADJUSTMENT 1. Display built-in cross-dot pattern using the TEST SIG- NAL SELECTION function. 2. Adjust the BRIGHTNESS and CONTRAST Controls for well defined pattern.

  • Page 9: Service Mode

    SERVICE MODE 1. ENTERING TO SERVICE MODE 1) Press MUTE button once 2) Press MUTE button 3) While pressing the MUTE button, on Remote Control. again to keep pressing. press MENU button on TV set. MUTE (Service mode display) 2. DISPLAYING THE ADJUSTMENT MENU 1) Press MENU button on TV.
  • Page 10 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 17.) 5.
  • Page 11 8. SELF DIAGNOSTIC FUNCTION 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 NO.

  • Page 12: Design Mode

    DESIGN MODE 1. ENTERING TO DESIGN MODE 1) Select the Service mode. 2) While pressing RECALL button on 3) Press MENU button on TV. Remote and press MENU button on TV. ITEM Press DATA Press (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.

  • Page 13: Electrical Adjustments

    ELECTRICAL ADJUSTMENTS ITEM ADJUSTMENT PROCEDURE FOCUS VR ADJ 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 ap- pears on the screen. 3. Adjust the FOCUS control (on T461) for well defined scanning lines on the picture screen.
  • Page 14 ITEM ADJUSTMENT PROCEDURE HORIZONTAL POSITION 1. Call up the adjustment mode display, then select the item HPOS or VPOS. (HPOS) 2. Press the TV/VIDEO button on Remote until the VERTICAL POSITION white cross-bar or black cross-bar pattern appears (VPOS) on the screen. 3.
  • Page 15 MTS ADJUSTMENT (FOR N5ES/N7S CHASSIS) ITEM INPUT SIGNAL ADJUSTMENT PROCEDURE • 1kHz 30% mod. → ANT ATTENUATOR 1. Connect rms meter to pin 12 of H002. (ATT) 2. Display item ATT on screen. terminal 3. Change data by VOLUME s/t buttons so that output at pin 12 of H002 becomes value as close as 142mVrms.
  • Page 16 MTS ADJUSTMENT (FOR N0ES CHASSIS) ITEM INPUT SIGNAL ADJUSTMENT PROCEDURE • 1kHz 30% mod. → ANT ATTENUATOR 1. Connect rms meter to pin 34 of QG01. (ATT) terminal 2. Display item ATT on screen. 3. Change data by VOLUME s/t buttons so that the reading of meter becomes value as close as 137mVrms.

  • Page 17: Circuit Checks

    CIRCUIT CHECKS HIGH VOLTAGE CHECK Troubleshooting Guide for Fail Safe Circuit CAUTION: There is no HIGH VOLTAGE ADJUSTMENT on this chassis. Checking should be done following the steps below. Check that the set returns to normal operation when pin 12 1.

  • Page 18: Chapter 2 Specific Informations

    CHAPTER 2 SPECIFIC INFORMATIONS SETTING & ADJUSTING DATA SAFETY INSTRUCTIONS 27" HIGH VOLTAGE AT ZERO BEAM: 28.1kV MAX HIGH VOLTAGE: 29.5 kV Table-1 SERVICE MODE ADJUSTING ITEMS AND DATA IN THE SERVICE MODE: Item Name of adjustment Preset Data Item Name of adjustment Preset Data...

  • Page 19: Location Of Controls

    LOCATION OF CONTROLS TV front VOLUME T S TV/VIDEO CHANNEL s t Remote sensor MENU TV/VIDEO VOLUME CHANNEL POWER POWER MENU T S t s POWER indicator TV rear ANT INPUT TERMINAL A/V INPUT TERMINAL – 18 –...
  • Page 20 Remote Control POWER TV/VIDEO POWER TV/VIDEO Channel Number CH RTN CH RTN RECALL RECALL MUTE MENU VOLUME Menu T S CHANNEL s t Menu s t MUTE EXIT MENU EXIT – 19 –...

  • Page 21: Programming Channel Memory

    PROGRAMMING CHANNEL MEMORY The channel memory is a 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.

  • Page 22: Circuit Block Diagram

    – 21 –...

  • Page 23: Chassis And Cabinet Replacement Parts List

    • 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. Model : 27A30 Capacitors ..... CD Ceramic Disk : Plastic Film : Electrolytic Resistors ....
  • Page 24 Location Location Part No. Description Part No. Description C860 24214103 CD, 0.01?F, ±10%, 500V CG38 24206229 EL, 2.2?F, ±20%, 50V C861 24212471 CD, 470pF, ±10% CG39 24206229 EL, 2.2?F, ±20%, 50V C862 24591224 PF, 0.22?F CG42 24797010 EL, 1?F, ±20%, 50V C863 24539104 PF, 0.1?F...
  • Page 25 Location Location Part No. Description Part No. Description R418 24531120 FR, 12 ohm, 1/2W R932 24366102 CF, 1k ohm R421 24321339 MF, 3.3 ohm, 1/2W R933 24366102 CF, 1k ohm R422 24366471 CF, 470 ohm R961 24554153 OMF, 15k ohm, 2W R430 24366102 CF, 1k ohm...
  • Page 26 Location Location Part No. Description Part No. Description RM02 24366332 CF, 3300 ohm Q901 A6363200 Transistor, 2CS3619 RM41 24366101 CF, 100 ohm Q902 A6363200 Transistor, 2CS3619 RR90 24366122 CF, 1200 ohm Q903 A6363200 Transistor, 2CS3619 RR91 24366122 CF, 1200 ohm Q904 23114528 Transistor, 2SC1740S, Q...
  • Page 27 Picture Tube, A68ADT28X02 TUNER TUNER TUNER TUNER TUNER H001 23321366 Tuner, EL951L ACCESSORIES ACCESSORIES ACCESSORIES ACCESSORIES ACCESSORIES K912 23306309 Remote Hand Unit, CT-9988 AT03 23588409 Battery Cover Y101 23563895 Owner’s Manual, English, 27A30 Y101F 23563896 Owner’s Manual, French, 27A30 – 26 –...

  • Page 28: Pc Boards Bottom View

    MAIN BOARD PB9416-1 BOTTOM (FOIL) SIDE – 27 – – 28 –...

  • Page 29: Terminal View Of Transistors

    CRT-D DRIVE BOARD PB9416-2 TERMINAL VIEW OF TRANSISTORS BOTTOM (FOIL) SIDE 2SD2253 2SC3852 2SC752GTM 2SC752 2SA1788 (old) 2SD1763A 2SC2482 2SA562TM 2SC5243 2SC1569 2SC2655 2SA1015 2SC4544 2SC4721P 2SC1815 2SA1788 2SC2878 2SA1306 2SC1740S 2SA1186A 2SC2120 2SA9335 RN2203 2SD1554 ON4409 RN2201 2SD2253 RN2004 2SD1556 RN1203 2SC5143...
  • Page 30 MEMO ..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................– 31 –...
  • Page 31 MEMO ..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................– 32 –...

  • Page 32: Specifications

    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:...
  • Page 33 TOSHIBA CORPORATION 1-1, SHIBAURA 1- CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

  • Page 34: Schematic Diagram

    SCHEMATIC DIAGRAM MODEL : 27A30 Chassis No. TAC0006 WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY RADIATION PRECAUTION", "SAFETY PRECAUTION" AND "PRODUCT SAFETY NOTICE" ON THE MANUAL FOR THIS MODEL. CAUTION: The international hazard symbols "*" in the schematic diagram and the parts list designate components 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.
  • Page 35 SCHEMATIC DIAGRAM MODEL : 27A30 Chassis No. TAC0006 NOTE: WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY RADIATION PRECAUTION", "SAFETY PRECAUTION" AND "PRODUCT SAFETY NOTICE" ON THE MANUAL FOR THIS MODEL. 1. RESISTOR Resistance is shown in ohm [K = 1.000, M = 1.000.000]. All resistors are 1/6W and 5% 4.

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