Toshiba 20A22 Service Manual Download Page 27 | Manualshive

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WAVEFORMS

NOTE: The following waveforms were measured at the point of the corresponding

balloon number in the schematic diagram.

200V 20

µ

s/div

17

22 50V 20

µ

s/div

50V 20

µ

s/div

20

10V 5ms/div

19

21 50V 20

µ

s/div

SOUND

10V 5ms/div

18

28 200mV 1ms/div

0.5V 1ms/div

33

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Summary of Contents for 20A22

Page 1: ...SERVICE MANUAL COLOR TELEVISION 20A22 FILE NO 050 200211 ...

Page 2: ...t which has the same character Especially as to the important parts for safety which is indicated in the circuit diagram or the table of parts as a mark the designated parts must be used 4 PUT PARTS AND WIRES IN THE ORIGINAL POSITION AFTER ASSEMBLING OR WIRING There are parts which use the insulation material such as a tube or tape for safety or which are assembled in the condition that these do n...

Page 3: ...uning System F Synth Input Impedance VHF UHF 75 ohm 2 69 4A A 5 A 1 CH Coverage A I J W W 1 W 84 Intermediate Picture FP 45 75MHz Frequency Sound FS 41 25MHz FP FS 4 50MHz Preset CH No Stereo Dual TV Sound No Tuner Sound Muting Yes G 3 Power Power Source AC 120V AC 60Hz DC Power Consumption at AC 80 W at AC 120 V 60 Hz Stand by at AC 5 W at AC 120 V 60 Hz Per Year kWh Year Protector Power Fuse Yes...

Page 4: ... chip Yes CH Label No Favorite CH No Color Stream DVD DTV No Control Level Yes Volume Yes Brightness Yes Contrast Yes Color Yes Tint NTSC Only Yes Sharpness Yes Tuning No Bass No Treble No Balance No Back Light No Stereo Audio Output SAP No Video Yes Color Stream No Channel TV Cable Yes CH Label No Game Timer Yes Sleep Timer Yes Sound Mute Yes V chip Rating Yes G 8 OSD Language English French Span...

Page 5: ...es 5 Yes 6 Yes 7 Yes 8 Yes 9 Yes 0 Yes 100 No CH Up Yes CH Down Yes Volume Up Yes Volume Down Yes TV Caption Text Yes CH1 CH2 Yes TV Video TV AV Yes CH RTN CH ENT Quick View Yes Sleep Yes RE Call Call Yes Reset Yes Menu Yes Enter Yes Mute Yes Exit No MTS Audio Select No Set Yes Set Yes Multi Brand Keys CH Up VCR No CH Down VCR No Pause Still No TV VCR VCR No Code No FF No Rew No Rec No Play No Sto...

Page 6: ...ock Yes Video Lock Yes Game Timer Yes Energy Star No Favorite CH No G 12 Accessories Owner s Manual Language English French W Warranty Yes Remote Control Unit Yes Rod Antenna No Poles Terminal Loop Antenna No Terminal U V Mixer No DC Car Cord Center No Guarantee Card No Warning Sheet No Circuit Diagram No Antenna Change Plug No Service Facility List No Important Safety Instruction Yes Dew AHC Caut...

Page 7: ...2 No Video Output No Audio Output No S Input No Color Stream No Diversity No Ext Speaker No DC Jack 12V Center No VHF UHF Antenna Input F Type AC Outlet No G 14 Set Size Approx W x D x H mm 506 5 x 484 x 464 5 G 15 Weight Net Approx 21 0kg 46 3 lbs Gross Approx 23 8kg 52 5 lbs G 16 Carton Master Carton No Content Sets Material Dimensions W x D x H mm x x Description of Origin No Gift Box Yes Mater...

Page 8: ... Flip up the sides of the Rubber Cap in the direction of the arrow and remove one side of the support Refer to Fig 1 2 2 DISASSEMBLY INSTRUCTIONS GND on the CRT Screwdriver Alligator Clip Support CRT GND on the CRT Rubber Cap CRT Support Fig 1 1 Fig 1 2 3 After one side is removed pull in the opposite direction to remove the other NOTE Take care not to damage the Rubber Cap INSTALLATION 1 Clean th...

Page 9: ...ng a blower type IC desoldering machine Refer to Fig 2 2 2 Fig 2 2 NOTE Do not add the rotating and the back and forth directions force on the IC until IC can move back and forth easily after desoldering the IC leads completely When IC starts moving back and forth easily after desoldering completely pickup the corner of the IC using a tweezers and remove the IC by moving with the IC desoldering ma...

Page 10: ... Thin tip Soldering Iron NOTE When the IC leads are bent during soldering and or repairing do not repair the bending of leads If the bending of leads are repaired the pattern may be damaged So be always sure to replace the IC in this case Finally confirm the soldering status on four sides of the IC using a magnifying glass Confirm that no abnormality is found on the soldering position and installa...

Page 11: ...TA SET mode by setting VOLUME to minimum Press both VOL DOWN button on the set and Channel button 6 on the remote control for more than 1 second ADDRESS and DATA should appear as FIG 1 ADDRESS is now selected and should blink Using the SET button on the remote step through the ADDRESS until required ADDRESS to be changed is reached Press ENTER to select DATA When DATA is selected it will blink Aga...

Page 12: ... TV 00 OSD 15 2 BASIC ADJUSTMENTS 2 2 RF AGC Place the set with Aging Test for more than 15 minutes Receive the VHF HIGH 63dB Connect the digital voltmeter to the TP001 Activate the adjustment mode display of Fig 1 1 and press the channel button 02 on the remote control to select RF AGC Press the VOL UP DOWN button on the remote control until the digital voltmeter is 2 5 0 05V 1 2 3 4 5 2 3 CUT OF...

Page 13: ...nd press the channel button 03 on the remote control to select V VCO Press the VOL UP DOWN button on the remote control until the digital voltmeter is 2 5V 1 2 3 4 5 2 13 SUB TINT SUB COLOR 1 2 3 4 5 6 7 8 9 10 Receive the color bar pattern RF Input Activate the adjustment mode display of Fig 1 1 and press the channel button 22 on the remote control to select TINT Connect the oscilloscope to TP024...

Page 14: ...e remote to set to the AV mode Then perform the above adjustment 1 3 1 2 3 4 2 14 SUB CONTRAST Please check if the fixed values of the each adjustment items are set correctly referring below 2 15 Confirmation of Fixed Value step No NO 04 07 14 15 16 18 20 21 23 24 25 26 27 28 29 FUNCTION H VCO V SHIFT BRIGHT MAX BRIGHT MIN CONT CENT CONT MIN COLOR MAX COLOR MIN SHARPNESS FM LEVEL LEVEL SEPARATION ...

Page 15: ...rforming adjustments in section 3 1 1 2 3 4 5 Receive the green raster pattern from color bar generator Adjust the pair of purity magnets to center the color on the screen Adjust the pair of purity magnets so the color at the ends are equally wide Move the deflection yoke backward to neck side slowly and stop it at the position when the whole screen is green Confirm red and blue color Adjust the s...

Page 16: ... PARTS LOCATION GUIDE WIRING CONNECTION CRT TU001 CP401 VR502 FB401 VR401 VR402 CP601 CP1001 TP001 T501 MAIN PCB CP806 CRT PCB SPEAKER TP402 CP802B CP803B CP803A CP802A TP022 TP024 J711 J710 CP502 CRT L503 J801 C D 8 0 1 CRT CP801 CP501 CD501 AC IN ...

Page 17: ...UT X RAY POWER 29 8 51 AUDIO OUT VIF IN 1 G IN B IN R IN RF AGC OUT POWER ON CONT H OUT VIF Vcc VIF IN 2 20 SCL 26 SDA 27 INV FBP OUT 10 V PULSE OUT 5 V OUT 28 FPB IN 16 13 STEREO 5V REG Q605 REG Q608 REG Q604 X602 3 579545MHz 31 11 49 8 7V REG OUT P CON 5 7V REG AT5 7V REG OUT Y SW OUT R OUT G OUT 47 RECTIFIER 16 B OUT Q606 REG REG Q603 AT 5V FEED BACK SW Q507 BUFFER Q502 SWITCHING Q501 FB401 10 ...

Page 18: ...14 C417 W081 C718 W015 C003 C446 W097 OS101 D105 W138 IC1001_1 W163 C504 C1006 W011 C533 CP503 W171 D509 R502 C 5 3 0 R503 W172 D521 D508 C810 W808 W802 C811 C809 W873 R806 CP806_1 Q805 Q804 Q806 R802 R804 W871 W811 W872 CP801 R805 R803 R807 J801_2 C503 C502 R5 43 R520 R504_1 RY501 Q501 Q502 R500 C509 R542 C511 HS501 TH 501 C507 D501 D503 D504 CP502 FH501 F501 FH502 L501 TP022 C802 W160 TP024 TP02...

Page 19: ...01 R119 R131 R141 R142 C140 R740 R734 R112 C609 C103 C104 R108 C007 R109 R635 C634 R106 R105 R130 C120 C138 R137 R136 R621 R606 R128 R135 R126 R101 R1001 C1002 R1002 Q1001 R505 R506 R507 C512 R809 R814 R816 R811 R815 R813 C801 C519_1 R125 R138 Q607 R513 R1015 R508 Q507 C513 C522 R639 I C 6 0 1 R146 C405 R643 W187 R404 W817 W833 W879 W880 R002 R117 R636 W899 W800 PRINTED CIRCUIT BOARDS MAIN CRT CHI...

Page 20: ...SE ONES ARE SINCE THESE PARTS MARKED BY CAUTION D001 MTZJ33B TP001 W899 W810 W801 W845 TM101 RC EH020 L101 2 7uH BT002 R03 AB E_20_T BT001 R03 AB E_20_T IC199 S 24C04BDP LA MEMORY IC 1 2 3 4 5 6 7 8 SW105 SKHVBED010 20 25 27 POWER SW104 SKHVBED010 25 27 VOL DOWN SW103 SKHVBED010 25 27 VOL UP SW102 SKHVBED010 25 27 CH DOWN SW101 SKHVBED010 20 CH DOWN 25 27 CH UP IC101 OEC7072A MICON IC 1 10 11 12 1...

Page 21: ...SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME DANS LA NOMENCLATURE DES PIECES N UTILISER QUE CELLS DECRITES DANGEREUSES AN POINT DE VUE SECURITE ETANT LES PIECES REPAREES PAR UN ATTENTION DESCRIBED IN PARTS LIST ONLY CRITICAL FOR SAFETY USE ONES ARE SINCE THESE PARTS MARKED BY CAUTION D603 MTZJ6 8B D610 MTZJ12B D611 MTZJ12B D612 MTZJ12B D602 MTZJ8 2B W832 W848 W817 W831 W816 W836 L607 15uH S803X S80...

Page 22: ... 001 2KV B C801 330P CH C403 0 22 100V MKT C443_1 0 0075 1 5KV MPP C405 0 1 F C417 1 50V YK C414 100 35V YK C433 470 35V YK C448 22 250V YK C418 2200 25V YK C446 1 50V YK C812 2 2 250V YK R427 100 1 4W R433 470 1 2W R412 470 1 2W R421 68K 1 4W R446 4 7K 1 2W R422 6 8K 1 2W R813 330 R445 180K 1 2W R404 220 R411 1K 1 2W R448 1 5M 1 4W R437 1 2K R432 680 1 2W R410 680 1 2W R809 3 9K R802 2 7K 1 4W R8...

Page 23: ...ICTURE IS NORMAL WITH THE DIGITAL TESTER WHEN THE COLOR BROADCAST NOTE THE DC VOLTAGE AT EACH PART WAS MEASURED C507 330 200V UP C521 100 160V YXF C531 1000 16V YK C503 0 001 2KV B C502 0 001 2KV B C515 0 001 500V B C530 0 0022 250V KY C519_1 180P CH C506 0 1 275V PHE840 C505 0 22 275V PHE840 C513 0 1 B C533 0 0022 250V KY C514 0 0015 2KV R C512 0 039 B C509 0 047 M C522 0 033 B C517_1 0 001 2KV R...

Page 24: ...R1002 47K R1001 68K R1015 68K R1010 100K 1 4W OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE NOTE THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME DANS LA NOMENCLATURE DES PIECES N UTILISER QUE CELLS DECRITES DANGEREUSES AN POINT DE VUE SECURITE ETANT LES PIECES REPAREES PAR UN ATTENTION DESCRIBED IN PARTS LIST ONLY CRITICAL FOR SAFETY USE ONES ARE SINCE THESE PARTS MARKED BY CAUTION W800 W863 W...

Page 25: ...IS NORMAL WITH THE DIGITAL TESTER WHEN THE COLOR BROADCAST NOTE THE DC VOLTAGE AT EACH PART WAS MEASURED C718 10 16V KA C701 10 16V KA R740 68 R741 10 1 4W R734 1K OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE NOTE THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME W882 MONO_AUDIO GND GND GND MONO_VIDEO FROM TO POWER FROM CHROMA FROM TO SOUND TO CHROMA VIDEO_3_IN L3_IN AV SCHEMATIC DIAGRAM MAIN P...

Page 26: ...s were measured at the point of the corresponding balloon number in the schematic diagram CHROMA 1 1V 0 1µs div 6 0 5V 20µs div 200mV 20µs div 7 9 200mV 20µs div 0 5V 5ms div 10 8 20V 20µs div 11 1V 20µs div 12 1V 20µs div 1V 20µs div 13 DEFLECTION CRT 14 0 5V 5ms div 15 20V 20µs div 16 2V 20µs div ...

Page 27: ...waveforms were measured at the point of the corresponding balloon number in the schematic diagram 200V 20µs div 17 22 50V 20µs div 50V 20µs div 20 10V 5ms div 19 21 50V 20µs div SOUND 10V 5ms div 18 28 200mV 1ms div 0 5V 1ms div 33 ...

Page 28: ...MECHANICAL EXPLODED VIEW 108 202 202 202 109 202 202 202 202 111 201 201 201 201 PCB110 CRT PCB ASS Y PCB010 MAIN PCB ASS Y 206 204 204 112 205 103 104 107 106 107 106 203 105 101 110 203 102 ...

Page 29: ...EARTH 112 BZ710260 899HV3T000 HOLDER ANODE WIRE 201 BZ710275 8121J50B54 SCREW TAPPING B0 GW20 5x28 202 BZ710035 8117540A64 SCREW TAPPING B0 TRUSS 4x16 203 BZ710031 8110630A04 SCREW TAP TITE P BRAZIER 3x10 204 BZ710239 8109I30A04 SCREW TAP TITE B WH7 3x10 205 BZ710019 8109630802 SCREW TAP TITE B BRAZIER 3x8 206 BZ710018 8107630804 SCREW TAP TITE S BRAZIER 3x8 AD301504 792WHA0379 PACKAGE TOP AD30150...

Page 30: ...Z110145 P2472B104M CMP 0 1 UF 275V PHE840 C507 AD300607 E51CGC331M CE 330 UF 200V C514 BZ110191 C03L0R7E3K CC 0 0015UF 2KV R C517 BZ110182 C03L0R713K CC 0 001 UF 2KV R C521 AD300060 E62NFB101M CE 100 UF 160V C530 AD301352 CC3LE0MH3M CC 0 0022UF 250V C531 AD300925 E02LT2102M CE 1000 UF 16V C533 AD301352 CC3LE0MH3M CC 0 0022UF 250V C618 AD301321 CQG0CH412J CC 100 PF 50V CH or BZ110166 CQGTCH412J CC ...

Page 31: ...Z510069 TCATC31980 TRANSISTOR SILICON KTC3198 AT Y GR Q506 BZ510096 TNATB03005 COMPOUND TRANSISTOR KRC102MAT Q507 BZ510109 TCAA3875SY TRANSISTOR SILICON KTC3875S_Y_RTK Q603 BZ510070 TCAT032034 TRANSISTOR SILICON KTC3203_Y AT Q604 BZ510070 TCAT032034 TRANSISTOR SILICON KTC3203_Y AT Q605 BZ510070 TCAT032034 TRANSISTOR SILICON KTC3203_Y AT Q606 BZ510070 TCAT032034 TRANSISTOR SILICON KTC3203_Y AT Q607...

Page 32: ...13H02 5P CP802B BZ614276 067U005049 WIRE HOLDER B2013H02 5P CP803A BZ614334 067U004029 WIRE HOLDER B2013H02 4P CP803B BZ614334 067U004029 WIRE HOLDER B2013H02 4P EL001 BZ614043 124116281A EYE LET XRY16X28BD EL002 BZ614044 124120301A EYE LET XRY20X30BD F501 BZ614125 081PC6R304 FUSE 51MS063LCC FB401 BZ310164 043219014F TRANSFORMER FLYBACK FQI 20B001R FH501 BZ614005 06710T0006 HOLDER FUSE EYF 52BC FH...

Page 33: ...TOSHIBA CORPORATION 1 1 SHIBAURA 1 CHOME MINATO KU TOKYO 105 8001 JAPAN ...

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