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Toshiba 25AF6SH Service Manual
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Toshiba 25AF6SH Service Manual

Toshiba 25AF6SH Service Manual

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FILE NO. 070-200112
SERVICE MANUAL
COLOUR TELEVISION
D1ES Chassis
25AF6SH
Dec. 2001

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  • Page 1 FILE NO. 070-200112 SERVICE MANUAL COLOUR TELEVISION D1ES Chassis 25AF6SH Dec. 2001...

  • 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 ................................12 CHAPTER 2 SPECIFIC INFORMATIONS SETTING & ADJUSTING DATA ............................13 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 13) 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 color of mode now selected : Green and Red Indicated color of other modes : White...

  • Page 9: Design Mode

    DESIGN MODE 1. ENTERING TO DESIGN MODE 1) Select the Service mode. 2) While pressing (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: 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 13: Chapter 2 Specific Informations

    CHAPTER 2 SPECIFIC INFORMATIONS SETTING & ADJUSTING DATA SAFETY INSTRUCTIONS 25" HIGH VOLTAGE AT ZERO BEAM: 32.8 kV MAX HIGH VOLTAGE: 33.0 kV AC VOLTAGE 110~240 V Table-1 SERVICE MODE ADJUSTING ITEMS AND DATAS IN THE SERVICE MODE: Item Adjustment Reference data Data ←...

  • Page 14: Location Of Controls

    LOCATION OF CONTROLS Front r ON-TIMER (green) q Power indicator (red) a Input source selection Remote sensor q Power switch Bihind the door L/MONO VIDEO AUDIO MENU c* Channel Position ts MENU a(3)Video 3 input Menu item select terminals Headphone jack (ø3.5 mm) For private listening, connect headphones.
  • Page 15 Remote CALL CALL Power on/standby o Sound Mute + – Volume Number (0-9) Channel position –/-- –/- - 1 or 2 digit selection a Input source selection* MENU MENU* h Picture menu 8 Sound menu 89 Menu item select* – + Menu item adjust* m I/II Stereo/Bilingual Selection * These functions have duplicate...

  • Page 16: 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 17 • 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 18: Circuit Block Diagram

    – 18 –...

  • Page 19: 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 : 25AF6SH Capacitors ..... CD Ceramic Disk : Plastic Film : Electrolytic Resistors ....
  • Page 20 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 C503 24092398 CERAMIC DISC, 25V 0.1UF Z, 24092398A...
  • Page 21 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 CV30 24073077 ELECTROLYTIC, 50V 0.1UF M 3A...
  • 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 R492 24366472 CARBON FILM, 1/6W 4.7K OHM 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 RA04 24366102 CARBON FILM, 1/6W 1K OHM 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 COILS &...
  • 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 QA11 23205081 TRANSISTOR, 2SA1980-Y(BU...
  • Page 26 24547399 FUSIBLE, 1W 3.9 OHM J K902 23306193 REMOCON HAND UNIT, CT9878 G894 23289100 COIL, PEAKING, TRF4100AF Y101 23565478 OWNER’S MANUAL, ENG/CAN, 25AF6SH G900 23289840 COIL, PEAKING, TRF4100AT Y102 23563228 INSTRUCTIONS, SAFETY GA60 24366101 CARBON FILM, 1/6W 100 OHM J...

  • Page 27: Pc Boards Bottom View

    SIGNAL BOARD PD0339E BOTTOM (FOIL) SIDE – 27 – – 28 –...
  • Page 28 POWER/DEF BOARD PD0340E BOTTOM (FOIL) SIDE – 29 – – 30 –...
  • Page 29 CONT/LED BOARD PB0413B BOTTOM (FOIL) SIDE CRT-D BOARD PD0338C BOTTOM (FOIL) SIDE – 31 – – 32 –...

  • Page 30: Terminal View Of Transistors

    TERMINAL VIEW OF TRANSISTORS 2SD2253 2SC3852 2SC752GTM 2SC752 2SA1788 2SD1763A (old) 2SC2482 2SA562TM 2SC5243 2SC1569 2SA1015 2SC2655 2SC4544 2SC1815 2SC4721P 2SA1788 2SC2878 2SA1306 2SC1740S 2SA1186A 2SC2120 2SA9335 ON4409 RN2203 2SD1554 2SD2253 RN2201 RN2004 2SD1556 RN1203 2SC5143 RN1204 RN2204 RN1205 RN1202 RN1201 –...
  • Page 31 THIS PAGE IS INTENTIONALLY LEFT BLANK. – 34 –...
  • Page 32 MEMO ..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................– 35 –...
  • Page 33 SCHEMATIC DIAGRAM MODEL : 25AF6SH 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 34: Specifications

    SPECIFICATIONS Rated voltage g 110 V – 240 V, 50/60 Hz Power consumption 125 W (Approx.) (at g 220 V, 50 Hz) 582 mm × 466 mm × 531 mm Dimensions Mass 33.7 kg Picture tube TYPE 25, flat picture tube 63 cm dia.
  • Page 35 TOSHIBA CORPORATION 1-1, SHIBAURA 1- CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...
  • Page 36 SCHEMATIC DIAGRAM MODEL : 25AF6SH 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.

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