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Toshiba 20AR20 Service Manual
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Toshiba 20AR20 Service Manual

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20AR20
In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its
original condition and only parts identical to those specified should be used.
ELECTRICAL SPECIFICATIONS ......................................................................................................... 1
IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................ 2
LOCATION OF USER'S CONTROL .................................................................................................... 4
INSTALLATION AND SERVICE INSTRUCTIONS ............................................................................... 5
CHASSIS LAYOUT ............................................................................................................................. 11
BLOCK DIAGRAM ............................................................................................................................. 13
SCHEMATIC DIAGRAMS .................................................................................................................. 15
PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 22
REPLACEMENT PARTS LIST ........................................................................................................... 25
PACKING OF THE SET ..................................................................................................................... 31
POWER INPUT ......................................... 110-220 V AC 50/60 Hz
POWER RATING
20AR20....
. ............................................................................ 88 W
20AR30.... . ............................................................................ 98 W
PICTURE SIZE ........................................... 1,194cm
CONVERGENCE ............................................................. Magnetic
SWEEP DEFLECTION ..................................................... Magnetic
FOCUS .............................................................. QPF Electrostatic
INTERMEDIATE FREQUENCIES
Picture IF Carrier Frequency ..................................... 45.75 MHz
Sound IF Carrier Frequency ...................................... 41.25 MHz
Color Sub-Carrier Frequency ..................................... 42.17 MHz
AUDIO POWER
OUTPUT RATING
20AR20.... . ........................................... 1.3W (at 10% distortion)
20AR30.... . ........................................... 2.5W (at 10% distortion)

SERVICE MANUAL

20AR30
MODELS
CONTENTS

ELECTRICAL SPECIFICATIONS

SPEAKER
SIZE ........................................................................ 9 cm x 5 cm
VOICE COIL IMPEDANCE
2
(185sq inch)
ANTENNA INPUT IMPEDANCE
VHF/UHF .................................................... 75 ohm Unbalanced
TUNING RANGES
VHF-Channels .............................................................. 2 thru 13
UHF-Channels ............................................................ 14 thru 69
CATV Channels .......................................................... 1 thru 125
(Nominal)
Specifications are subject to change without
prior notice.
1
1
COLOR TELEVISION
Chassis No. SN-70A
20AR20/30
20AR20.... . ...................................................... 8 ohm at 400 Hz
20AR30.... . .................................................... 16 ohm at 400 Hz
20AR20/30
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Summary of Contents for Toshiba 20AR20

  • Page 1: Table Of Contents

    SIZE ................ 9 cm x 5 cm 20AR20................. 88 W VOICE COIL IMPEDANCE 20AR30................. 98 W 20AR20............8 ohm at 400 Hz PICTURE SIZE ........... 1,194cm (185sq inch) 20AR30............16 ohm at 400 Hz CONVERGENCE ............. Magnetic ANTENNA INPUT IMPEDANCE SWEEP DEFLECTION .............

  • Page 2: Important Service Safety Precaution

    20AR20/30 IMPORTANT SERVICE SAFETY PRECAUTION Service work should be performed only by qualified service technicians who are throughly familiar with all safety checks and the servicing guidelines which follow: WARNING X-RADIATION AND HIGH VOL TAGE LIMITS 1. For continued safety, no modification of any circuit 1.
  • Page 3 20AR20/30 IMPORTANT SERVICE SAFETY PRECAUTION (Continued) BEFORE RETURNING THE RECEIVER Connect the resistor connection to all exposed metal 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 4: Location Of User's Control

    20AR20/20AR30 Location of Controls Front Panel 20AR20 20AR30 VIDEO/AUDIO- VIDEO/AUDIO- IN TERMINALS IN TERMINALS CHANNEL UP/DOWN CHANNEL UP/DOWN ( ) Selects next higher channel. ( ) Selects next higher channel. POWER POWER ( ) Selects next lower channel. ( ) Selects next lower channel.

  • Page 5: Installation And Service Instructions

    20AR20/30 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. CIRCUIT PROTECTION HIGH VOLTAGE CHECK The receiver is protected by a 3.15A fuse (F701),...
  • Page 6 20AR20/30 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 7 00-3F Must be set to "20" C.C.POSITION 00-7F Y-MUTE / V-MUTE 00,01,03 "00"=Normal, "01"=No-Y, "03"=No Vertical OPTION (Set to each model) 00-FF Must be set to "08"=20AR20, "09"=20AR30 MTS LEVEL 00-0F STEREO-VCO 00-3F FILTER 00-3F LOW SEPARATION 00-3F HIGH SEPARATION...

  • Page 8: Service Adjustment

    20AR20/30 SERVICE ADJUSTMENT VCO Adjustment White Balance Adjustment 1. Connect a digital voltmeter between pin (44) of IC201 1. Receive a good local channel. and ground. 2. Enter the service mode and select the service 2. Receive a good local channel.
  • Page 9 20AR20/30 Sub-Color Adjustment Horizontal Position Adjustment 1. Receive a good local channel. 1. Receive a good local channel. 2. Make sure the customer color control is set to center 2. Enter the service mode and select the service position .

  • Page 10: Mts Adjustment

    20AR20/30 MTS ADJUSTMENT (Only for 20AR30) MTS Level Adjustment 1. Feed the following monaural signal to pin (14) of IC3001. Monaural signal : 300Hz, 245mVrms 2. Connect the rms voltmeter to pin (39) of IC3001. 3. Enter the service mode and select the service adjustment "M01".

  • Page 11: Chassis Layout

    20AR20/20AR30 MODEL 20AR20 CHASSIS LAYOUT PWB-B PWB-C PWB-A...
  • Page 12 20AR20/20AR30 MODEL 20AR30 CHASSIS LAYOUT PWB-B PWB-C PWB-A...

  • Page 13: Block Diagram

    20AR20/20AR30 MODEL 20AR20 BLOCK DIAGRAM...
  • Page 14 20AR20/20AR30 MODEL 20AR30 BLOCK DIAGRAM...

  • Page 15: Schematic Diagrams

    20AR20/20AR30 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. signal, the tint setting adjusted for proper color. The (K=k =1000 , M=M ) wave shapes at the red, green and blue cathodes of 2.
  • Page 16 20AR20/20AR30 MODEL 20AR20 SCHEMATIC DIAGRAM : MAIN Unit VSP9050PB218A VSP9050PB218A VTST5UF78...
  • Page 17 20AR20/20AR30 H0106GJ H0201PE...
  • Page 18 20AR20/20AR30 MODEL 20AR30 SCHEMATIC DIAGRAM : MAIN-1 Unit VSP9050PB25WA VSP9050PB25WA VTST5UF78 CILG0107PE...
  • Page 19 20AR20/20AR30 H0106GJ H0201PE...
  • Page 20 20AR20/20AR30 MODEL 20AR30 SCHEMATIC DIAGRAM : MAIN-2 Unit...
  • Page 21 20AR20/20AR30 SCHEMATIC DIAGRAM : FRONT AV and CRT Unit 20AR20 20AR30...

  • Page 22: Printed Wiring Board Assemblies

    20AR20/20AR30 PRINTED WIRING BOARD ASSEMBLIES PWB-A: MAIN Unit (Wiring Side)
  • Page 23 20AR20/20AR30 PWB-A: MAIN Unit (Chip Parts Side)
  • Page 24 20AR20/20AR30 PWB-B: CRT Unit (Wiring Side) PWB-C: FRONT AV Unit (Wiring Side)

  • Page 25: Replacement Parts List

    PWB-A DUNTK9731WEV3 — Main Unit (20AR20) AD100073 RH-DX0441CEZZ D501 Diode 0004 PWB-A DUNTK9731WEV4 — Main Unit (20AR30) RH-DX0110CEZZ 0005 PWB-C DUNTK9732WEV3 — Front AV Unit (20AR20) AD100069 RH-DX0131CEZZ D502 Diode 0006 PWB-C DUNTK9732WEV4 — Front AV Unit (20AR30) AD100073 RH-DX0441CEZZ...
  • Page 26 20AR20/30 Loc. Description Part No. Ref. No. Loc. Part No. Ref. No. Description PWB-A: DUNTK9731WEV3(20AR20) AD100177 VCSATA1CE226K T antalum PWB-A: DUNTK9731WEV4(20AR30) AD100130 VCEA0A1HW105M MAIN UNIT (Continued) AD100135 VCEA0A1HW475M AD100127 VCEA0A1CW477M D704 Diode AD100121 VCEA0A1CW108M C102 1000 AD100067 RH-DX0055TAZZ AD100071 RH-DX0302CEZZ...
  • Page 27 20AR20/30 Loc. Part No. Ref. No. Description Part No. Ref. No. Description Loc. No. PWB-A: DUNTK9731WEV3(20AR20) AD100117 VCE9GA1HW475M C3001 EL.(N.P) PWB-A: DUNTK9731WEV4(20AR30) (20AR30) MAIN UNIT (Continued) AD100154 VCKYCY1HB562K C3002 5600p Ceramic (20AR30) AD100135 VCEA0A1HW475M C652 AD100169 VCQYTA1HM123J C3003 0.012 Mylar...
  • Page 28 20AR20/30 Loc. No. Part No. Description Loc. No. Part No. Ref. No. Description Ref. PWB-A: DUNTK9731WEV3(20AR20) AD100244 VRN-VV3AB2R2J R659 M-Film PWB-A: DUNTK9731WEV4(20AR30) AD100247 VRN-VV3ABR47J R661 0.47 1W M-Film AD100299 VRW-KQ4AC2R7K R701 Cement MAIN UNIT (Continued) AD100298 VRW-KQ3HC1R5K R702 Cement R306 1.5k 1/16W M-Ox.
  • Page 29 20AR20/30 Loc. No. Part No. Description Loc.No. Part No. Description Ref. No. Ref. No. PWB-A: DUNTK9731WEV3(20AR20) AD100034 QPLGN0260CEZZ P702 Plug, 2-pin(M) PWB-A: DUNTK9731WEV4(20AR30) AD100037 QPLGN0461CEZZ P751 Plug, 4-pin(YBN) AD100038 QPLGN0561CEZZ P901 Plug, 5-pin(E) MAIN UNIT (Continued) AD100038 QPLGN0561CEZZ P2001 Plug, TP2001-5...

  • Page 30: Miscellaneous Parts

    Connecting Cord AD100304 VS2SC2229O/1E Q854 2SC2229 AD100025 QCNW-2110PEZZ Connecting Cord AD100304 VS2SC2229O/1E Q856 2SC2229 AD100311 VSP9050PB218A Speaker (20AR20) 0300 VS2SA1266-Y-1 Q881 2SA1266(Y) AD100312 VSP9050PB2 Speaker (20AR30) DIODES SUPPLIED ACCESSORIES You can substitute "RH-DX0045GEZZ" and "RH-DX0446CEZZ" for "VHD1SS119//-1". AD100179 VHD1SS119//-1 D881...

  • Page 31: Packing Of The Set

    20AR20/20AR30 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PACKING OF THE SET Polyethylene Bag Operation manual Infrared R/C Unit AC Adapter SPAKP0102GJZZ Warranty Card Batteries Polyethylene Foam Wrap CINS-7104WEV0 Buffer Material SPAKX0002GJZZ FRONT Packing Case...
  • Page 32 HEAD OFFICE / 82 TOTOWA ROAD, WAYNE, NEW JERSEY 07470 TEL: (973) 628-8000 LATIN AMERICA DIVISION 1900 NORTH WEST 84TH AVENUE, MIAMI, FLORIDA 33126 TEL: (305) 470-9355 TOSHIBA DE MEXICO, S.A. DE C.V. SIERRA CANDELA NO. 111 6-PISO COL. LOMAS DE CHAPULTEPEC 11000 MEXICO, D.F. TEL: (5) 202-26-77...

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20ar30

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