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Toshiba 20AR33 Service Manual
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Toshiba 20AR33 Service Manual

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TOSHIBA
FILE NO. 050-200337

SERVICE MANUAL

COLOR TELEVISION
20AR33
MTS STER EO
AUTO V OLTAGE
DOCUMENT CREATED IN JAPAN, Aug., 2003

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Summary of Contents for Toshiba 20AR33

  • Page 1: Service Manual

    TOSHIBA FILE NO. 050-200337 SERVICE MANUAL COLOR TELEVISION 20AR33 MTS STER EO AUTO V OLTAGE DOCUMENT CREATED IN JAPAN, Aug., 2003...

  • Page 2: Table Of Contents

    Sound IF Carrier Frequency ........41.25 MHz CATV Channels ............1 thru 125 Color Sub-Carrier Frequency ........42.17 MHz (Nominal) AUDIO POWER Specifications are subject to change without OUTPUT RATING prior notice. 20AR33 ........3.0 + 3.0 W (at 10% distortion)

  • Page 3: Important Service Safety Precaution

    20AR33 IMPORTANT SERVICE SAFETY PRECAUTION Ë Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and the servicing guidelines which follow: WARNING X-RADIATION AND HIGH VOLTAGE LIMITS 1. For continued safety, no modification of any circuit 1.

  • Page 4: Safety Notice

    20AR33 IMPORTANT SERVICE SAFETY PRECAUTION (Continued) • Connect the resistor connection to all exposed metal BEFORE RETURNING THE RECEIVER parts having a return to the chassis (antenna, metal (Fire & Shock Hazard) cabinet, screw heads, knobs and control shafts, escutcheon and etc.) and measure the AC voltage Before returning the receiver to the user, perform drop across the resistor.

  • Page 5: Location Of User's Control

    20AR33 LOCATION OF USER'S CONTROL Front Panel (20AR33) VIDEO/AUDIO TERMINALS MT S S T ER EO AUT O V OL T AGE POWER Press Press again Off. CHANNEL UP/DOWN ( ) Selects next higher channel. ( ) Selects next lower channel.

  • Page 6: Installation And Service Instructions

    20AR33 INSTALLATION AND SERVICE INSTRUCTIONS Note: (1) When performing any adjustments to resistor controls and transformers use non-metallic screwdrivers or TV alignment tools. (2) Before performing adjustments, the TV set must be on at least 15 minutes. HIGH VOLTAGE CHECK CIRCUIT PROTECTION The receiver is protected by a 3.15A fuse (F701),...
  • Page 7 20AR33 For adjustments of this model, the bus data is converted to various analog signals by the D/A converter circuit. Note: There are still a few analog adjustments in this series such as focus and master screen voltage. Follow the steps below whenever the service adjustment is required. See "Table-B" to determine, if serv- ice adjustments are required.
  • Page 8 20AR33 SERVICE MODE (1) In the Service Mode, Key is used to select the mode in the following oreder. AGC & WHITE POINT GEOMETRIC ADJ. ADJ. MODE MODE MODE OFFSET ADJ. MODE FEATURE OPTION OPTION ADJ. MODE MODE MODE AGC &...
  • Page 9 20AR33 OFFSET ADJ. ADJ. MODE MODE ↓ ↓ Y-D TIME (TV) [ YD ] (DL-TV) ATTENUATE INPUT SIGNAL LEVEL (ATT) ↓ ↓ Y-D TIME (AV) [ YD ] (DL-AV) VCO FREE RUNNING FREQUENCY ADJ. (VCO) ↓ ↓ INITIAL/DEFAULT LANGUAGE (INIT) STEREO, SAP, DBX FILTER ADJ.

  • Page 10: Service Mode

    20AR33 SERVICE MODE DATA SERVICE REMARK ADJUST ITEM POSITION RANGE INITIAL VALUE FIX/ADJ AGC TAKE OVER POINT 0~63 V-LIN VERTICAL SLOPE 0~63 V-AMP VERTICAL AMP 0~63 V-CENT VERTICAL SHIFT 0~63 V-ZOOM VERTICAL ZOOM 0~63 H-CENT HORIZONTAL SHIFT 0~63 H-SIZE EAST-WEST WIDTH...
  • Page 11 20AR33 DATA SERVICE REMARK ADJUST ITEM POSITION RANGE INITIAL VALUE FIX/ADJ FMWS FM WINDOW SELECTION 0(disable) or1(enable) SOUND MUTE BIT 0 (SM0) 0(disable) or1(enable) SOUND MUTE BIT 1 0(disable) or1(enable) AGC0 IF AGC SPEED BIT 0 0(disable) or1(enable) AGC1 IF AGC SPEED BIT 1...

  • Page 12: Service Adjustment

    20AR33 Ë SERVICE ADJUSTMENT RF AGC Adjustment 1. Receive a good local channel. 2. Enter the service mode signal category and select the service adjustment "AGC". 3. Set the data value to point where no noise or beat appears. 4. Select another channel to confirm that no noise or beat appears.
  • Page 13 20AR33 CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT No. Adjusting point Adjusting procedure/conditions Waveform and others CRT CUTOFF 1. Switch TV to VIDEO mode,BLUE BACK OFF, with ADJUSTMENT NO VIDEO signal. 3.5Vdc C BUS 2. Press R/C to set Picture Normal condition.

  • Page 14: Description Of Schematic Diagram

    20AR33 DESCRIPTION OF SCHEMATIC DIAGRAM WAVEFORM MEASUREMENT CONDITIONS: NOTES: 1. Photographs taken on a standard gated color bar 1. The unit of resistance "ohm" is omitted. (K=k Ω =1000 Ω , M=M Ω ) signal, the tint setting adjusted for proper color. The wave shapes at the red, green and blue cathodes of 2.

  • Page 15: Block Diagram

    20AR33 BLOCK DIAGRAM-1...

  • Page 16: Schematic Diagrams

    20AR33 SCHEMATIC DIAGRAM: CRT Unit...
  • Page 17 20AR33 MODEL 20AR33 BLOCK DIAGRAM-2...
  • Page 18 20AR33...
  • Page 19 20AR33...
  • Page 20 20AR33...
  • Page 21 20AR33...
  • Page 22 20AR33...

  • Page 23: Chassis Layout

    20AR33 MODEL 20AR33 CHASSIS LAYOUT...

  • Page 24: Printed Wiring Board Assemblies

    20AR33 PRINTED WIRING BOARD ASSEMBLIES PWB-A: MAIN Unit (Wiring Side)
  • Page 25 20AR33 PWB-A: MAIN Unit (Chip Parts Side)
  • Page 26 20AR33 PWB-B: CRT Unit (Wiring Side) PWB-B: CRT Unit (Chip Parts Side)
  • Page 27 20AR33 PWB-E: MTS MODULE Unit (Wiring Side) PWB-E: MTS MODULE Unit (Chip Parts Side)

  • Page 28: Replacement Parts List

    Toshiba Part No. Part No. Ref.No. Description PARTS LIST PWB-A: DUNTK541WEA8 (20AR33) PARTS REPLACEMENT MAIN UNIT Replacement parts which have these special safety characteristics identified in this manual; electrical components having such features NOTE: THE PARTS HERE SHOWN ARE SUPPLIED AS AN å...
  • Page 29 20AR33 Toshiba Part No. Part No. Ref.No. Description Toshiba Part No. Part No. Ref.No. Description AD100471 VCEAKA1HW224M C314 0.22 PWB-A: DUNTK541WEA8 (20AR33) AD100498 VCQYTA1HM103J C332 0.01 Mylar AD100391 RC-EZ1086CEZZ C333 1000 MAIN UNIT (Continued) AD100452 VCEA0A1CW106M C359 AD100480 VCKYCY1EF104Z C409...
  • Page 30 20AR33 Toshiba Part No. Part No. Ref.No. Description Toshiba Part No. Part No. Ref.No. Description PWB-A: DUNTK541WEA8 (20AR33) AD100572 VRS-CY1JF392J R209 3.9k 1/16W M-Ox. MAIN UNIT (Continued) AD100589 VRS-RG3LB223J R216 M-Ox. AD100526 VRD-RA2BE392J R219 3.9k 1/8W Carbon CAPACITORS AD100563 VRS-CY1JF221J...
  • Page 31 20AR33 Toshiba Part No. Part No. Ref.No. Description Toshiba Part No. Part No. Ref.No. Description PWB-A: DUNTK541WEA8 (20AR33) MAIN UNIT (Continued) AD100559 VRS-CY1JF123J R806 1/16W M-Ox. AD100555 VRS-CY1JF103J R807 1/16W M-Ox. AD100563 VRS-CY1JF221J R808 1/16W M-Ox. AD100522 VRD-RA2BE224J R809 220k...

  • Page 32: Crt Unit

    20AR33 Toshiba Part No. Part No. Ref.No. Description Toshiba Part No. Part No. Ref.No. Description PWB-B: DUNTK542WEA3 PWB-A: DUNTK541WEA8 (20AR33) CRT UNIT MAIN UNIT (Continued) TRANSISTORS AD100379 QPLGN0461CEZZ P302 Plug, 4-pin (S) AD100425 RH-TX0110BMZZ Q870 TX0110BM AD100381 QPLGN0660CEZZ P601 Plug,...
  • Page 33 20AR33 Toshiba Part No. Part No. Ref.No. Description PWB-E: DUNTK545WEA0 MTS MODULE UNIT INTEGRATED CIRCUITS AD100507 VHiCXA2074Q-1 IC3001 CXA2074Q AD100508 VHiMM1501XN-1 IC3002 MM1501XNRE TRANSISTORS AD100595 VS2SC3198-G-1 Q3003 C3198-G DIODE AD100420 RH-EX0632GEZZ D3001 Zener Diode CAPACITORS [EL. …Electrolytic] AD100447 VCE9GA1HW475M C3001 EL.

  • Page 34: Packing Parts

    20AR33 Toshiba Part No. Part No. Ref.No. Description Toshiba Part No. Part No. Ref.No. Description MISCELLANEOUS PARTS PACKING PARTS (NOT REPLACEMANT ITEM) AD100359 QACCZ3008PEZZ ACC701 AC Cord AD100815 SPAKCA904WJZZ – Packing Case — AD100599 VSP9050PB394A SP301 Speaker AD100437 SPAKP0102GJZZ –...

  • Page 35: Packing Of The Set

    20AR33 PACKING OF THE SET Polyethylene Bag Operation Manual Infrared R/C Unit Batteries Wrapping Paper Buffer Material FRONT Packing Case Use tape to fix top side of pack case. REAR Use 12 staples fix the packing case. MARK : Not Replacement Items.
  • Page 36 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

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