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Toshiba 34HF81 Service Manual
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Toshiba 34HF81 Service Manual

Color television n1ws chassis
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See also: Owner's Manual
FILE NO. 020-200123

SERVICE MANUAL

COLOR TELEVISION
N1WS Chassis
34HF81
(TAC0135)
PUBLISHED IN JAPAN. Aug.,2001 So

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Summary of Contents for Toshiba 34HF81

  • Page 1: Service Manual

    FILE NO. 020-200123 SERVICE MANUAL COLOR TELEVISION N1WS Chassis 34HF81 (TAC0135) PUBLISHED IN JAPAN. Aug.,2001 So...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS CHAPTER 1 GENERAL ADJUSTMENTS SAFETY INSTRUCTIONS ............................3 SET-UP ADJUSTMENT ............................4 SERVICE MODE ..............................8 ELECTRICAL ADJUSTMENTS ..........................11 CIRCUIT CHECKS ..............................13 CHAPTER 2 SPECIFIC INFORMATIONS SETTING & ADJUSTING DATA ..........................14 LOCATION OF CONTROLS ........................... 15 PROGRAMMING CHANNEL MEMORY .........................

  • 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. This receiver is equipped with a Fail Safe (FS) circuit which 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 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 6 WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU- TION” AND “PRODUCT SAFETY NOTICE” ON PAGE 3 OF SERVICE MANUAL. (SET-UP ADJUSTMENT FOR FLAT TUBE) 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 7 (5)Adjust the sub-4-pole magnets only in case there is any deviation of Xv bow-shaped convergence. (To be usually set at the initial position) Align both sides with the sub-4-pole magnets and minimize the deviation of blue and red with the main 4-pole magnets. Xv bow-shaped deviation of convergence red/blue blue...

  • Page 8: Service Mode

    SERVICE MODE 1. ENTERING TO SERVICE MODE 1) Press MUTE button twice 2) Press MUTE button 3) While pressing the MUTE button, on Remote Control. again to keep pressing. press MENU button on TV set. 1/2 MUTE MUTE (Service mode display) 2.
  • Page 9 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 14) 5.
  • Page 10 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 11: 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 12 ITEM ADJUSTMENT PROCEDURE E-W PARABOLA (DPC) 1. Call up the adjustment mode display, then select the item PARA. (PARA) 2. Press the TV/VIDEO button on Remote until the cross-hatch pattern appears on the screen. 3. Press the VOLUME s or t button to make vertical lines straight as shown below. HORIZONTAL POSITION 1.

  • Page 13: 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 14: Chapter 2 Specific Informations

    PIP CONTRAST VPS2 V-SHIFT (Fixed) PCNT ← ← PIP COLOR PICTURE WIDTH PCOL Table-2 OPTION: (PROGRESSIVE 4:3 DV) OPT1 (2CAH) OPT2(2CBH) MODELS D0 HEX D7 D0 HEX 34HF81 Table-3 CIRCUIT CHECKS FBT DETECTION VOLTAGE 18.9 V Table-4 – 14 –...

  • Page 15: Location Of Controls

    LOCATION OF CONTROLS TV Front MENU Video/Audio inputs TV/VIDEO (Video 3) VOLUME ts CHANNEL ts VIDEO-3 IN MENU TV/VIDEO VOLUME CHANNEL POWER S-VIDEO VIDEO AUDIO L/MONO INSIDE DOOR Remote sensor TV Rear ANT(75 ANT-1 ANT-2 S-VIDEO COLOR COLOR STREAM STREAM VIDEO VIDEO HD - 1...

  • Page 16: Remote Control

    Remote Control Power turns the TV on or off SLEEP sets the TV to turn at a specific time LIGHT The initial press of the LIGHT button causes two actions: Channel Numbers (0–9, 100) allow direct access to channels MODE cycles through the 6 device modes FAVOURITE allows access to Multi-Window function INFO allows access to Multi-Window function...

  • Page 17: Programming Channel Memory

    PROGRAMMING CHANNEL MEMORY The channel memory is the 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 automatically. If necessary, arrange the preset channels with the ADD/ERASE functions so that you can tune into only desired channels.

  • 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 : 34HF81 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 C501 24109103 CERAMIC CHIP CK73B 50V 10000PF K...
  • 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 C881 24214471 CERAMIC DISK CK45 B 500V 470PF K...
  • 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 CD09 24797220 ELECTROLYTIC CE04G 50V 22UF M...
  • 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 CV262 24794470 ELECTORLYTIC, 16V 47UF M CX181 24105101...
  • 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 CX325 24092538 CERAMIC CHIP CK73F 10V 1UF Z CX821 24105100...
  • 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 CZ02 24100104 CERAMIC CHIP, 25V 100000PF Z...
  • Page 26 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 R379 24382103 OXIDE METAL FILM, 1W 10K OHM J...
  • Page 27 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 R718 24366222 CARBON FILM, 1/6W 2.2K OHM J...
  • Page 28 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 R2105 24011101 CHIP, METAL FILM, 1/20W 100 OHM J...
  • Page 29 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 RA361 24011102 CHIP, METAL FILM, 1/20W 1K OHM J RD49...
  • Page 30 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 RS37 24011101 CHIP, METAL FILM, 1/20W 100 OHM J...
  • Page 31 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 RX115 24011272 METAL FILM CHIP 1/20W 2.7K J RX201 24011101...
  • Page 32 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 RX319 24019439 CHIP BLOCK P-8 1/16W P-8 470J RX557 24871681...
  • Page 33 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 RY545 24011103 CHIP, METAL FILM, 1/20W 10K OHM J RZ101...
  • Page 34 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 L885 23248073 COIL, CHOKE, TLN3299D...
  • Page 35 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 LY331 23103886 INDUCTOR, CHIP BEAD 3A 60OHM...
  • Page 36 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 Q611 A6359871 TRANSISTOR, 2SC3326B LTAPE...
  • Page 37 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 QS11 A6359871 TRANSISTOR, 2SC3326B LTAPE...
  • Page 38 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 QZ06 23314993 TRANSISTOR, 2SC4081 Q...
  • Page 39 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 DA70 23118041 DIODE, MA111...
  • Page 40 REMOCON HAND UNIT IR, CTVUSA PV01 23365274 JACK, PIN JACK 2S6P 2S6P CT-90047 PV02 23365819 JACK, 1S3P Y101 23565334 OWNER’S MANUAL, (ENG. 34HF81) 34HF81 PV03 23365949 JACK, 5P, 1E:OFF+2R:OFF+2L:OFF, JALC Y120 23945015 BAG, POLYETHYLENE COVER 250X400 PV04 23365949 JACK, 5P, 1E:OFF+2R:OFF+2L:OFF, JALC...

  • Page 41: Pc Boards Bottom View

    SIGNAL BOARD PD0343 BOTTOM (FOIL) SIDE – 41 – – 42 –...
  • Page 42 POWER/DEF BOARD PD0344 BOTTOM (FOIL) SIDE – 43 – – 44 –...
  • Page 43 CRT-D/VM BOARD PD0347 BOTTOM (FOIL) SIDE – 45 –...
  • Page 44 CONT BOARD PD0345-1 BOTTOM (FOIL) SIDE – 46 –...
  • Page 45 LED BOARD PD0345-2 AC INPUT BOARD PD0345-3 BOTTOM (FOIL) SIDE BOTTOM (FOIL) SIDE – 47 –...
  • Page 46 VERT BOARD PD0346 BOTTOM (FOIL) SIDE WOW BOARD PD0348 BOTTOM (FOIL) SIDE – 48 –...
  • Page 47 NEXT HYPER BOARD PD0264 BOTTOM (FOIL) SIDE – 49 –...
  • Page 48 THIS PAGE IS INTENTIONALLY LEFT BLANK. – 50 –...

  • Page 49: Terminal View Of Transistors

    TERMINAL VIEW OF TRANSISTORS 2SD2253 2SC3852 2SC752 2SA1788 2SC752GTM (old) 2SD1763A 2SA562TM 2SC2482 2SC5243 2SC1569 2SC2655 2SA1015 2SC4544 2SC4721P 2SC1815 2SA1788 2SC2878 2SA1306 2SC1740S 2SA1186A 2SC2120 2SA9335 ON4409 RN2203 2SD1554 RN2201 2SD2253 RN2004 2SD1556 RN1203 2SC5143 RN1204 2SC5570 RN2204 2SD2553 RN1205 RN1202 RN1201...
  • Page 50 MEMO ..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................– 52 –...
  • Page 51 MEMO ..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................– 53 –...
  • Page 52 MEMO ..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................– 54 –...

  • Page 53: 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 54 TOSHIBA CORPORATION 1-1, SHIBAURA 1- CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

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