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Toshiba 20A22 Service Manual
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Toshiba 20A22 Service Manual

Color television
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FILE NO. 050-200211

SERVICE MANUAL

COLOR TELEVISION
20A22
DOCUMENT CREATED IN JAPAN, Jul., 2002

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Summary of Contents for Toshiba 20A22

  • Page 1: Service Manual

    FILE NO. 050-200211 SERVICE MANUAL COLOR TELEVISION 20A22 DOCUMENT CREATED IN JAPAN, Jul., 2002...

  • Page 2: Servicing Notices On Checking

    SERVICING NOTICES ON CHECKING 1. KEEP THE NOTICES 6. AVOID AN X-RAY As for the places which need special attentions, Safety is secured against an X-ray by consider- they are indicated with the labels or seals on the ing about the cathode-ray tube and the high cabinet, chassis and parts.

  • Page 3: General Specifications

    GENERAL SPECIFICATIONS CRT Size / Visual Size 20 inch / 508.0mmV System CRT Type Normal Deflection degree Magnetic Field BV/BH +0.45G/0.18G Color System NTSC Speaker 1Speaker Position Front Size 1.6 x 2.8 Inch Impedance Sound Output 1.5 W 10%(Typical) 1.0 W NTSC3.58+4.43 /PAL60Hz Tuning Broadcasting System...
  • Page 4 GENERAL SPECIFICATIONS On Screen Menu Display Menu Type Character Picture Contrast Brightness Color Tint Sharpness Audio Bass Treble Balance BBE On/Off Stable Sound On/Off CH Set Up TV/CABLE(CATV) Auto CH Memory Add/ Delete Lock CH Lock Video Lock Game Timer Change Password Language V-chip...
  • Page 5 GENERAL SPECIFICATIONS G-10 Remote Unit RC-EH Control Glow in Dark Remocon Format Toshiba Custom Code 40-BF h Power Source Voltage(D.C) UM size x pcs UM-4 x 2 pcs Total Keys Keys Keys Power CH Up CH Down Volume Up Volume Down...
  • Page 6 GENERAL SPECIFICATIONS G-11 Features Auto Degauss Auto Shut Off Canal+ CATV Anti-theft Rental Memory(Last CH) Memory(Last Volume) V-Chip Type USA,ORION Type Auto Search CH Allocation Just Clock Function CH Label VM Circuit Full OSD Premiere Comb Filter Lines Auto CH Memory Hotel Lock Closed Caption Stable Sound...
  • Page 7 GENERAL SPECIFICATIONS G-13 Interface Switch Front Power System Select Main Power SW Sub Power Channel Up/Reset Channel Down/Enter Volume Up/Set Up Volume Down/Set Down MENU=Volume Up+Volume Down Rear AC/DC TV/CATV Selector Degauss Main Power SW Indicator Power Stand-by On Timer Terminals Front Video Input...

  • Page 8: Removal Of Anode Cap

    DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF ANODE CAP 3. After one side is removed, pull in the opposite direction to remove the other. Read the following NOTED items before starting work. NOTE After turning the power off there might still be a potential Take care not to damage the Rubber Cap.

  • Page 9: Removal And Installation Of Flat Package Ic

    DISASSEMBLY INSTRUCTIONS REMOVAL AND INSTALLATION OF When IC starts moving back and forth easily after desoldering completely, pickup the corner of the IC using a FLAT PACKAGE IC tweezers and remove the IC by moving with the IC desoldering machine. (Refer to Fig. 2-3.) REMOVAL NOTE Put the Masking Tape (cotton tape) around the Flat...
  • Page 10 DISASSEMBLY INSTRUCTIONS INSTALLATION When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thin-tip Take care of the polarity of new IC and then install the new Soldering Iron. (Refer to Fig. 2-8.) IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily.

  • Page 11: Service Mode List

    SERVICE MODE LIST This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. To enter the Service Mode, press both set key and remote control key for more than 1 second. Remocon Key Set Key Operations VOL.

  • Page 12: Before Making Electrical Adjustments

    ELECTRICAL ADJUSTMENTS BEFORE MAKING ELECTRICAL 2. BASIC ADJUSTMENTS ADJUSTMENTS 2-1: CONSTANT VOLTAGE Read and perform these adjustments when repairing the Place the set with Aging Test for more than 15 minutes. circuits or replacing electrical parts or PCB assemblies. Set condition is AV MODE without signal. Using the remote control, set the brightness and contrast CAUTION to normal position.
  • Page 13 ELECTRICAL ADJUSTMENTS 2-6: VIF VCO 2-11: OSD HORIZONTAL Place the set with Aging Test for more than 10 minutes. Activate the adjustment mode display of Fig. 1-1. Receive the monoscope pattern. Press the VOL. UP/DOWN button on the remote Connect the digital voltmeter between the pin 5 of control until the difference of A and B becomes CP601 and the GND.
  • Page 14 ELECTRICAL ADJUSTMENTS "A" Fig. 2-2 White 100% Red 120% Fig. 2-3 2-14: SUB CONTRAST Activate the adjustment mode display of Fig. 1-1 and press the channel button (17) on the remote control to select "CONT.MAX". Press the VOL. UP/DOWN button on the remote control until the contrast step No.

  • Page 15: Purity And Convergence Adjustments

    ELECTRICAL ADJUSTMENTS 3. PURITY AND CONVERGENCE 3-3: STATIC CONVERGENCE ADJUSTMENTS NOTE Adjust after performing adjustments in section 3-2. NOTE Receive the crosshatch pattern from the color bar Turn the unit on and let it warm up for at least 30 generator.

  • Page 16: Electrical Adjustment Parts Location Guide (Wiring Connection)

    ELECTRICAL ADJUSTMENTS 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) CRT PCB TP024 CP806 TP022 J801 CP802B CP803B CP801 CP803A CP601 FB401 VR401 TP402 TU001 VR402 CP401 VR502 CP802A T501 CP1001 CD501 AC IN CP502 CP501 SPEAKER J710 J711 MAIN PCB...

  • Page 17: Block Diagram

    BLOCK DIAGRAM Q1001 MUTE SW CHROMA IC IC1001 AN7523 IC601 M61250FP TU001 SOUND 51 AUDIO OUT SP1001 AUDIO IN (FRONT) AMP IC VIDEO IN (FRONT) J711 J710 RF AGC OUT X' TAL CF601 VIF IN(1) SAW FILTER MICON IC X602 IC101 OEC7072A 3.579545MHz VIF IN(2)
  • Page 18 PRINTED CIRCUIT BOARDS MAIN/CRT (INSERTED PARTS) SOLDER SIDE SW101 SW104 SW103 SW105 SW102 D105 W013 OS101 J710 6.3A125VOR250V S802X FH501 FH502 TP024 W876 C505 F501 J801_2 CP806_1 Q405 Q609 CP501 TP022 D613 W875 W068 R500 TP023 S802Y R806 Q806 Q804 Q805 R114 R139...
  • Page 19 PRINTED CIRCUIT BOARDS MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE R142 R004 R141 R513 R532 C513 Q507 R534 R437 R507 C519_1 R508 W800 C512 R505 R506 R1015 R643 R611 C602 R609 W187 R1002 R740 C606 Q1001 C634 C622 R635 R601 R137 C801 R816 R136...
  • Page 20 MICON/TUNER SCHEMATIC DIAGRAM (MAIN PCB) ACCESSORY TU001 ENV56DB6G3 BT001 R03(AB)E_20_T TM101 BT002 RC-EH020 R002 R03(AB)E_20_T R101 R126 C003 RED LED 2.7K R128 POWER ON D105 R004 R135 390K SLR-342VCT32 OS101 RPM7138-H5 W810 FROM/TO POWER R001 AT+40V 1/2W POWER_FAIL R110 1K 1/4W R140 R107 47K 1/4W...

  • Page 21: Chroma Schematic Diagram

    CHROMA SCHEMATIC DIAGRAM (MAIN PCB) FROM POWER UNREG+12V R629 Q603 KTC3203_Y Q604 Q605 KTC3203_Y KTC3203_Y Q606 KTC3203_Y TO AV 11.3 5.09 7.66 5.67 Q608 MONO_VIDEO KTC3203_Y R643 W836 C627_1 CF603 SFSRA4M50CF00-A0 R646 C638 1.59 8.66 0.51 8.03 3.17 8.76 2.56 1.96 2.84 3.25...
  • Page 22 DEFLECTION/CRT SCHEMATIC DIAGRAM (MAIN PCB) CP802A CP802B FROM/TO CHROMA B2013H02-5P B2013H02-5P CLAMP CLAMP CLAMP CLAMP CLAMP G.OUT G.OUT G.OUT G.OUT G.OUT R.OUT R.OUT R.OUT R.OUT R.OUT B.OUT B.OUT B.OUT B.OUT B.OUT V-OUT IC IC401 AN5522 CP803A B2013H02-4P CP803B B2013H02-4P V_FEEDBACK HEATER HEATER HEATER...

  • Page 23: Power Schematic Diagram

    POWER SCHEMATIC DIAGRAM (MAIN PCB) TO CHROMA 6.3A 125V UNREG+12V CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, RELAY DRIVE REPLACE ONLY WITH THE SAME TYPE FUSE Q504 6.3A 125V(F501). D516 KTC3198 T501 ATTENTION:POUR UNE PROTECTION CONTINUE LES RISQUES D’INCEIE 1SS133 8135080S N’UTOLISER QUE DES FUSIBLE DE MEME TYPE 131.7 6.3A 125V(F501).
  • Page 24 SOUND SCHEMATIC DIAGRAM (MAIN PCB) FROM MICON/TUNER AUDIO_MUTE FROM/TO DEFLECTION/CRT SOUND AMP IC IC1001_1 AN7523 FROM/TO AV FROM POWER SOUND+B W829 SOUND_GND S801X S801Y FROM CHROMA W863 CP1001_1 CD1001_2 STEREO+5V TID-X02P-B2 CH12403B SPEAKER SP1001_2 810-47-171 8 OHM AUDIO_OUT R1002 MUTE SW. Q1001 KTC3875S_Y_RTK PCB010...
  • Page 25 AV SCHEMATIC DIAGRAM (MAIN PCB) VIDEO_3_IN VIDEO IN(FRONT) J710 HTJ-032-03AY AUDIO_L IN(FRONT) C701 R734 L3_IN J711 HTJ-032-03AW TO CHROMA W882 MONO_AUDIO FROM/TO SOUND FROM/TO POWER FROM CHROMA MONO_VIDEO PCB010 TMB540 NOTE:THE DC VOLTAGE AT EACH PART WAS MEASURED NOTE: THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME WITH THE DIGITAL TESTER WHEN THE COLOR BROADCAST OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE AUDIO SIGNAL...
  • Page 26 WAVEFORMS MICON/TUNER 12 1V 20µs/div 200mV 20µs/div 1 1V 0.1µs/div 1V 20µs/div 20V 20µs/div 0.5V 20µs/div DEFLECTION/CRT 3 200mV 20µs/div 14 0.5V 5ms/div 9 200mV 20µs/div 200mV 5ms/div 15 20V 20µs/div 0.5V 5ms/div CHROMA 11 1V 20µs/div 6 0.5V 20µs/div 16 2V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.
  • Page 27 WAVEFORMS 22 50V 20µs/div 200V 20µs/div SOUND 10V 5ms/div 28 200mV 1ms/div 10V 5ms/div 0.5V 1ms/div 50V 20µs/div 21 50V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

  • Page 28: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW PCB110 (CRT PCB ASS'Y) PCB010 (MAIN PCB ASS'Y)

  • Page 29: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description AD301496 A3L706X720 CABINET,FRONT ASSY BZ710039 8995034000 CORD CLIP UL CO. AD301497 701WPJB758 CABINET,FRONT AD301498 711WPA0173 PLATE,FRONT AD301499 713WPA0214 GUIDE,REMOCON AD301500 735WPA0670 BUTTON,BASE AD301501 735WPBA435 BUTTON,FRAME AD301502 702WPAA279 CABINET,BACK AD301503 722549A096 SHEET,RATING AD300007...

  • Page 30: Electrical Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST Location No. TSB P/N Reference No. Description RESISTORS R402 AD300043 R3X181102J R,METAL OXIDE OHM 1W ! R408 AD301014 R4X5T6472F R,METAL 4.7K OHM 1/6W ! R409 AD300037 R4X5T6153F R,METAL 15K OHM 1/6W ! R424 BZ210105 R4X5T6183F R,METAL 18K OHM 1/6W ! R429 BZ210046...
  • Page 31 ELECTRICAL REPLACEMENT PARTS LIST Location No. USA-TOSHIBA Reference No. Description DIODES D515 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77 D516 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77 ! D518 BZ410063 D2WTAU02A0 DIODE,SILICON AU02A-EIC D519 BZ410076 D2WXB290S0 DIODE,SILICON SB290S D520 BZ410006 D1VT001330 DIODE,SILICON 1SS133T-77 D521 BZ410006 D1VT001330...
  • Page 32 ELECTRICAL REPLACEMENT PARTS LIST Location No. USA-TOSHIBA Reference No. Description MISCELLANEOUS B501 BZ310122 024HT03563 CORE,BEADS W4BRH3.5X6X1.0X2 B504 BZ310129 024HT03564 CORE,BEADS W4BRH3.5X6X1 ! CD501 AD300746 120R615901 CORD,AC BUSH 0R615901 CD801 BZ614175 06CU82039A CORD,CONNECTOR SM1098-009-1A CF601 BZ613031 1029045R7G FILTER,SAW TSF5229P3 CF603 AD301328...
  • Page 33 TOSHIBA CORPORATION 1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN...

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