Toshiba 20A3E Service Manual
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Toshiba 20A3E Service Manual

Toshiba 20A3E Service Manual

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FILE NO. 060-200111
SERVICE MANUAL
COLOUR TELEVISION
S1E Chassis
20A3E
PRINTED IN JAPAN, Aug., 2001 T

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  • Page 1 FILE NO. 060-200111 SERVICE MANUAL COLOUR TELEVISION S1E Chassis 20A3E PRINTED IN JAPAN, Aug., 2001 T...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS CHAPTER 1 GENERAL ADJUSTMENTS SAFETY INSTRUCTIONS ............................3 SET-UP ADJUSTMENT ............................4 SERVICE MODE ..............................6 DESIGN MODE ................................ 9 ELECTRICAL ADJUSTMENTS ..........................10 CIRCUIT CHECK ..............................15 CHAPTER 2 SPECIFIC INFORMATIONS SETTING & ADJUSTING DATA ..........................16 LOCATION OF CONTROLS ...........................

  • Page 3: 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. The only source of X-RAY RADIATION in this TV receiver ous X-RAY RADIATION.

  • Page 4: 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 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 5 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 6: Service Mode

    SERVICE MODE 1. ENTERING TO SERVICE MODE 1) Press o button once on 2) Press o button again to 3) While pressing the o button, Remote Control. keep pressing. press MENU button on TV set. Item Data (Service mode display) 2.
  • Page 7 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 16) 5.
  • Page 8 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. Indicated colour of mode now selected : Green and Red Indicated colour of other modes : White...

  • Page 9: Design Mode

    DESIGN MODE 1. ENTERING TO DESIGN MODE 1) Select the Service mode. 2) While pressing o (or CALL) 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”...

  • Page 10: 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 11 ITEM ADJUSTMENT PROCEDURE WHITE BALANCE 1. Set Contrast to 40, and brightness to +20 by picture control. ADJUSTMENT 2. Set the TV in service mode, and get the inside W/B adjusting signal with VIDEO button. • CUTOFF ADJUSTMENT 3. Select RCUT, GCUT and BCUT with CHANNEL s, t buttons, to set individual (RCUT) values to Initial reference data, and to set GDRV and BDRV to Initial reference (GCUT)
  • Page 12 S1E: Series (Reference factory adjustment) 1 AFT/AGC ADJUSTMENT (Measuring point) TP-13/TP-14 (Input frequency) CW: 38.00 [MHz] 95dBµV at 75Ω load (Adjusting method) 1) Open link of IF out. 2) Input 1000pf cap. to link at tuner side to ground. 3) Input frequency after link. CW: 38.00 [MHz] 95dBµV at 75Ω load 4) Power On 5) Select RFAGC key, on screen display "RAGC OK, Coil OK"...
  • Page 13 6 SUB COLOUR NTSC (COLC) (Measuring point) Q501 #22 (B-OUT) (Adjusting signal) Sub Bright (NTSC) signal *Note: For Thailand model use Video input (Adjusting method) 1) Set BUS date of Q501 to the same value as that SUB TINT adjustment. 2) Set user control to the standard 1.
  • Page 14 9 SECAM BELL FILTER ADJUSTMENT (Measureing point) (Adjusting signal) NO ADJUSTMENT (Adjusting method) 10 SECAM R-Y ADJUSTMENT (For models M, MJ, R, TR only) (Measuring point) Q501 #20 R-Y OUT (Adjusting signal) Colour bar (SECAM) signal (Adjusting method) Adjust (SRY) the level of the monochrome signal part must be a match to the level of horizontal blanking signal.

  • Page 15: Circuit Check

    CIRCUIT CHECK HIGH VOLTAGE 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.

  • Page 16: Chapter 2 Specific Informations

    CHAPTER 2 SPECIFIC INFORMATIONS SETTING & ADJUSTING DATA SAFETY INSTRUCTIONS 20" HIGH VOLTAGE AT ZERO BEAM: 25.7 kV MAX HIGH VOLTAGE: 27.5 kV AV VOLTAGE 110~240 V Table-1 SERVICE MODE ADJUSTING ITEMS AND DATAS IN THE SERVICE MODE: Item Adjustment Reference data Data ←...

  • Page 17: Location Of Controls

    LOCATION OF CONTROLS Front Main Power On/Off Head Phone Jack Channel Up Video In Channel Down Audio Input Left MENU Open Audio Input Right Power Ind. Infra-red Sensor Remote mute CALL on-screen on/off Power ON/OFF Direct Select –/-- Digit Select TV/VIDEO Select Position down/up Volume down/up...

  • Page 18: Programming Channel Memory

    PROGRAMMING CHANNEL MEMORY • First, use the ASM (Automatic Search Memory) function to preset all the active channels in your area automatically. Then, arrange the preset channels with the SEARCH (>>>), MFT (Manual Fine Tuning) and AFT (Auto Fine Tuning) functions so that you can tune into only desired channels.
  • Page 19 • Use the SEARCH function if desired channels could not be preset with the ASM, or if you would like to preset the desired channels to specific position numbers one by one. • The adjustments below are not necessary under normal conditions. However, in areas of inferior broadcast conditions where adjustment is necessary for a better picutre, adjust the tuning with the MFT (Manual Fine Tuning).

  • Page 20: Circuit Block Diagram

    – 20 –...

  • Page 21: 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 : 20A3E Capacitors ..... CD Ceramic Disk : Plastic Film : Electrolytic Resistors ....
  • Page 22 Location Location Location Location Location Location Location Location Location Location Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description C610 24591473 PLASTIC FILM, 50V 0.047MF J...
  • Page 23 Location Location Location Location Location Location Location Location Location Location Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description R307 24366304 CARBON,FILM G SB 1/6W 300K J...
  • Page 24 Location Location Location Location Location Location Location Location Location Location Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description RA33 24366471 CARBON F1LM, 1/6W 470 OHM J...
  • Page 25 Location Location Location Location Location Location Location Location Location Location Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description Parts No. Parts No. Parts No. Parts No. Parts No. Description Description Description Description Description T401 23224983 TRANSFORMER, HORIZONTAL DRIVE,...
  • Page 26 Description Description Description Description Description G883 23357341 DIODE, VF=1.2V DO-34 1SS133 A702A 23946237 PACKING, TOP PACKING 20A3E GA02 24366470 CARBON FILM, 1/6W 47 OHM J 20A3E;A015113 GJ07 24366472 CARBON FILM, 1/6W 4.7K OHM J A702B 23946238 PACKING, BOTTOM PACKING 20A3E...

  • Page 27: Pc Boards Bottom View

    MAIN BOARD PD0301 BOTTOM (FOIL) SIDE – 27 – – 28 –...
  • Page 28 CRT-D BOARD PD0300 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 ON4409 RN2203 2SD1554 RN2201 2SD2253 RN2004 2SD1556 RN1203 2SC5143 RN1204...

  • Page 29: Terminal View Of Transistors

    TERMINAL VIEW OF TRANSISTORS 2SD2253 2SC3852 2SC752 2SA1788 2SC752GTM (old) 2SD1763A 2SC2482 2SA562TM 2SC5243 2SC1569 2SC2655 2SA1015 2SC4544 2SC4721P 2SC1815 2SA1788 2SC2878 2SA1306 2SC1740S 2SA1186A 2SC2120 2SA9335 ON4409 2SD1554 RN2203 RN2201 2SD2253 RN2004 2SD1556 RN1203 2SC5143 RN1204 2SD2553 RN2204 RN1205 RN1202 RN1201 –...

  • Page 30: Specifications

    SPECIFICATIONS Rated voltage AC 110 V – 240 V, 50/60 Hz Power consumption 70 W (Approx.) (at AC 220 V, 50 Hz) Width 630 mm × Height 456 mm × Depth 465 mm Dimensions Picture tube TYPE 20 (51 cm) Overall picture tube measured diagonally (48 cm) Viewable picture tube measured diagonally 90°...
  • Page 31 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...
  • Page 32 SCHEMATIC DIAGRAM MODEL : 20A3E 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 33 SCHEMATIC DIAGRAM MODEL : 20A3E 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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