JVC AV-20D304/SA Service Manual Download Page 1

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Summary of Contents for AV-20D304/SA

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Page 2: ...PYRIGHT 2003 VICTOR COMPANY OF JAPAN LTD No 52103 2003 02 AV 20D304 COLOR TELEVISION 52103 2003 02 AV 20D304 SA TABLE OF CONTENTS 1 PRECAUTIONS 1 3 2 SPECIFIC SERVICE INSTRUCTIONS 1 4 3 ADJUSTMENT 1 10 BASIC CHASSIS FE2 ...

Page 3: ...r Sound IF Carrier 45 75MHz 41 25MHz 4 5MHz Color Sub Carrier 3 58MHz Power Input 120V AC 60Hz Power Consumption 75W Picture Tube 20 51cm measured diagonally H 40 6cm x V 30 5cm High Voltage 26 3kV 0 5kV at zero beam current Speaker 5 x 9cm 2 x 3 1 2 Oval type x 2 Audio Power Output 1 2W x 2 Antenna terminal VHF UHF F type connector 75ohm Video Audio Input 1 2 3 Video 1 3 Audio 1 2 3 S Video Input...

Page 4: ...d or adjusted See ADJUSTMENT OF B1 POWER SUPPLY 8 Do not check high voltage by drawing an arc Use a high voltage meter or a high voltage probe with a VTVM Discharge the picture tube before attempting meter connection by connecting a clip lead to the ground frame and connecting the other end of the lead through a 10kΩ 2W resistor to the anode button 9 When service is required observe the original l...

Page 5: ...AV 20D304 1 4 No 52103 SECTION 2 SPECIFIC SERVICE INSTRUCTIONS 2 1 FUNCTIONS REAR PANEL REMOTE CONTROL UNIT RM C1254G FRONT PANEL MENU POWER CHANNEL VOLUME ...

Page 6: ...emoving the 4 screws D of the speaker remove the lower side screw first and then remove the upper one 2 2 4 CHECKING THE PW BOARD Remove the REAR COVER 1 Pull out the MAIN CHASSIS refer to REMOVING THE MAIN PWB 2 Erect the MAIN CHASSIS vertically so that you can easily check the backside of the PW Board CAUTION When erecting the chassis be careful so that there will be no contacting with other PW ...

Page 7: ...AV 20D304 1 6 No 52103 Fig 1 PWB STOPPER D C D SPEAKER SPEAKER MAIN PWB CRT SOCKET PWB REAR COVER POWER CORD FEONT CABINET HVT A B ...

Page 8: ...tting data 3 Power on Connect the power cord to the outlet and switch the power on 4 Setting of receive channels Set the receive channels For setting refer to the OPERATING INSTRUCTIONS 5 User settings Check the user setting items according to USER SETTING VALUES and if these are different set the correct value 6 SERVICE MENU setting Verify what to set in the SERVICE MENU and set whatever is neces...

Page 9: ...E MODE INITIAL SETUP MODE TINT Center LANGUAGE ENG COLOR Center FRONT PANELLOCK OFF PICTURE 8 V2 COMPONENT IN NO BRIGHT Center AUTO SHUT OFF OFF DETAIL 10 CLOSED CAPTION OFF NOISE MUTING ON AUTO TUNER SET UP AIR SOUND MODE CHANNEL SUMMARY Unnecessary to set BASS Center V CHIP OFF TREBLE Center SET LOCK CODE 0000 Unnecessary to set BALANCE Center XDS ID ON MTS STEREO CLOCK TIMERS MODE SET CLOCK MAN...

Page 10: ...ith the tweezers and remove the chip part Transistors diodes variable resistors etc 1 Apply extra solder to each lead 2 As shown in the figure push the part with tweezers and alternately melt the solder at each lead Shift and remove the chip part Note After removing the part remove remaining solder from the pattern 2 How to install Chip parts Resistors capacitors etc 1 Apply solder to the pattern ...

Page 11: ... warning up for at least 30 minutes before starting adjustments 5 If the receive or input signal is not specified use the most appropriate signal for adjustment 6 Never touch the parts such as variable resistors transformers and condensers not shown in the adjustment items of this service adjustment 7 Preparation for adjustment Unless otherwise specified in the adjustment items preset the followin...

Page 12: ...ig 1 CRT SOCKET PWB Within MAIN PWB ASS Y T TP E SOLDER SIDE TOP CRT EARTH BRAIDED ASS Y E1 TP B MAIN PWB POWER FRONT HV UPPER FOCUS LOWER SCREEN X TUNER MEMORY IC201 IC702 IC421 HVT S AV IN OUT VOL VOL CH CH MENU POWER B1 IC901 F901 U IC101 T111 S401 ...

Page 13: ...usts the VIDEO and CHROMA control circuit 2 DEF D This mode adjusts the DEFLECTION control circuit 3 SOUND A This mode adjusts the SOUND control circuit 4 OTHERS F This mode adjusts the display setting and the other settings Do not change the values 7 LOW LIGHT This mode adjusts the WHITE BALANCE LOW LIGHT control circuit 8 HIGH LIGHT This mode adjusts the WHITE BALANCE HIGH LIGHT control circuit ...

Page 14: ...rom S01 BRIGHT to S21 AGC ADJ 2 Press the VOLUME keys to change the adjustment value The setting value will be stored automatically when release the REMOTE CONTROL UNIT keys It can adjust the items from 1 V C S to 3 SOUND A in the same procedure 7 LOW LIGHT 8 HIGH LIGHT AND 9 VCO ADJUSTMENT MODE Since the key operation in this mode is peculiar please refer to the clause of the ADJUSTMENT PROCEDURE...

Page 15: ...2 DEF D 7 LOW LIGHT 8 HIGH LIGHT 3 SOUND A 4 OTHERS F 9 VCO 11 I2C BUS SERVICE MENU 1 V C S 2 DEF D 3 SOUND A 4 OTHERS F 7 LOW LIGHT 8 HIGH LIGHT 9 VCO 11 12C BUS SELECT BY OPERATE BY EXIT BY TOO HIGH GOOD TOO LOW SYNC YES AFC ON FINE 0 I2C BUS ON F01 OSD POSI A01 IN LEVEL SERVICE MENU MAIN MENU EXIT Do not adjust Do not adjust ...

Page 16: ... THEATER STANDARD THEATER S01 BRIGHT 0 127 64 S02 PICTURE 0 127 65 S03 COLOR 0 127 41 47 S04 TINT 0 127 63 64 S05 DETAIL 0 63 30 35 40 S06 BRIGHT 128 127 0 1 1 S07 PICT 128 127 15 0 0 S08 COLOR 128 127 3 0 S09 TINT 128 127 6 4 S10 DETAIL 128 127 3 No Setting item Variable range Initial setting value RF EXT SV CV COMPONENT STANDARD THEATER STANDARD THEATER LOW HIGH LOW HIGH LOW HIGH LOW HIGH S11 R ...

Page 17: ...0 No Setting item Variable range Initial setting value A01 IN LEVEL 0 63 36 A02 FH MON 0 1 0 A03 ST VCO 0 63 43 A04 PIL CAN 0 1 0 A05 FILTER 0 63 35 A06 LOW SEP 0 63 8 A07 HI SEP 0 63 26 A08 5FH MON 0 1 0 A09 SAP VCO 0 63 44 No Setting item Variable range Initial setting value F01 OSD POSI 0 255 28 F02 OSD PREQ 0 255 85 F03 CCD POSI 0 63 47 F04 CCD FREQ 0 255 94 F05 CCD CONT 0 63 11 F06 PUR CONT 0...

Page 18: ...B and check the SYNC YES 4 Adjust CW transf until GOOD letters turns green And then confirm that the SYNC YES again Adjustment can be done in this statement 5 Push the EXIT key to exit the 9 VCO mode TOO HIGH GOOD TOO LOW SYNC YES AFC ON FINE 0 Item Measuring instrument Test point Adjustment part Description RF AGC Signal generator Remote control unit 1 V C S S21 AGC ADJ 1 Receive a black and whit...

Page 19: ...V CENTER Signal generator Remote control unit 2 DEF D D03 V SIZE V CENTER SW S401 MAIN PWB 1 Receive the crosshatch signal 2 Select the D03 V SIZE 3 Adjust the D03 so that the vertical screen size becomes 90 4 Adjust the V CENTER SW to agree the vertical cen ter with display center H CENTER Signal generator Remote control unit 2 DEF D D02 H POSI 1 Receive the crosshatch signal 2 Select D02 H POSI ...

Page 20: ... horizontal line that is displayed becomes white using the 4 to 9 keys 8 Turn the SCREEN VR until the single horizontal line is displayed faintly 9 Press the 2 key to cancel the single horizontal line mode 10 Adjust the S01 level to become the black component shines white slightly by VOLUME key 11 Confirm that whether the color ingredient of R G or B is visible to the black component which shines ...

Page 21: ...E key 4 If the brightness is not the best with the initial setting value make fine adjustment of the S01 until you get the optimum brightness SUB CONTRAST Remote control unit 1 V C S S02 PICTURE 1 Receive the broadcast 2 Select S02 PICTURE of the 1 V C S 3 Set the initial setting value of the S02 with the VOLUME key 4 If the contrast is not the best with the initial setting value make fine adjustm...

Page 22: ...INT Signal generator Oscilloscope Remote control unit TP B TP E CRT SOCKET PWB 1 V C S S04 TINT Method of adjustment without measuring instrument 1 Receive the broadcast 2 Select S04 TINT of the 1 V C 3 Set the initial setting value of the S04 with the VOLUME key 4 If the tint is not the best with the initial setting value make fine adjustment of the S04 until you get the optimum tint Method of ad...

Page 23: ...inal 2 Connect an oscilloscope to R OUT pin of the AUDIO OUT and display one cycle portion of the 300Hz signal 3 Select the A06 LOW SEP of the SOUND MODE 4 Set the initial setting value of the A06 with the VOLUME key Adjust the A06 so that the stroke element of the 300Hz signal will become minimum 5 Change the connection of the oscilloscope to L OUT pin of the AUDIO OUT and enlarge the voltage axi...

Page 24: ...into the center of the screen Fig 3 8 Move the deflection yoke forward and fix the position of the deflection yoke so that the whole screen will become green 9 Insert the wedge to the top side of the deflection yoke so that it will not move 10 Input a crosshatch signal 11 Verify that the screen is horizontal 12 Input red and blue raster signals and make sure that purity is properly adjusted Fig 1 ...

Page 25: ...make best convergence DYNAMIC CONVERGENCE ADJUSTMENT 1 Move the deflection yoke up and down and overlap the lines in the periphery Fig 2 2 Move the deflection yoke left to right and overlap the lines in the periphery Fig 3 3 Repeat 1 and 2 above and make best convergence After adjustment fix the wedge at the original position Fasten the retainer screw of the deflection yoke Fix the 6 magnets with ...

Page 26: ... 9 2 CHECKING OF THE HIGH VOLTAGE HOLD DOWN CIRCUIT 1 Turn the power switch to on 2 As shown in Fig 1 set the resistor between X connector 1 and 3 3 Make sure that the screen picture disappears 4 Temporarily unplug the power plug 5 Remove the resistor replaced X connector 1 and 3 6 Again plug the power plug make sure that the normal picture is displayed on the screen Fig 1 T521 CONNECTOR RESISTOR ...

Page 27: ...WPC Printed in Japan AV 20D304 JVC SERVICE ENGINEERING COMPANY OF AMERICA DIVISION OF JVC AMERICAS CORP www jvcservice com US Only JVC CANADA INC Head office 21 Finchdene Square Scarborough Ontario M1X 1A7 416 293 1311 ...

Page 28: ...e Capacitor MF R Metal Film Resistor MF CAP Metalized Film Capacitor MG R Metal Glazed Resistor MM CAP Metalized Mylar Capacitor MP R Metal Plate Resistor MP CAP Metalized Polystyrol Capacitor OM R Metal Oxide Film Resistor PP CAP Polypropylene Capacitor CMF R Coating Metal Film Resistor PS CAP Polystyrol Capacitor UNF R Non Flammable Resistor TF CAP Thin Film Capacitor CH V R Chip Variable Resist...

Page 29: ...6 002A A POWER KNOB 4 CM43094 009 H JVC MARK 100 GQ10020 001B A F CABINET ASSY Inc 101 101 GQ30024 002A A DOOR Ref No Part No Part Name Description Local V01 A51KRE89X DT PICTURE TUBE DY01 QQD0011 001 DEF YOKE L01 QQW0133 001 DEG COIL T1521 QQH0128 001 FB TRANSF 5 CHGB0016 0H BRAIDED ASSY 6 QAS0054 001 SPEAKER x2 SP01 02 7 CM48144 001 A PB STOPPER 8 GQ10013 001B A REAR COVER 9 LC20106 001D A POWER...

Page 30: ...AV 20D304 No 52103 3 3 EXPLODED VIEW 2 6 7 10 9 14 6 16 8 5 T1521 V01 L01 DY01 CRT SOCKET PWB Within MAIN PWB MAIN PWB x4 x9 13 12 11 15 16 ...

Page 31: ... T3 SI DIODE D1905 SARS01 T2 SI DIODE D1907 MA700A T2 SB DIODE D1908 MTZJ15C T2 Z DIODE D1921 1SR35 400A T2 SI DIODE D1922 1SR35 400A T2 SI DIODE D1923 1SR35 400A T2 SI DIODE D1924 1SR35 400A T2 SI DIODE D1925 1SS133 T2 SI DIODE D1926 RU3AM LFC4 SI DIODE D1927 RU3YX LFC4 SI DIODE D1928 RU3YX LFC4 SI DIODE D1929 MTZJ7 5A T2 Z DIODE D1930 1SS133 T2 SI DIODE D1931 1SS133 T2 SI DIODE D1932 MTZJ33B T2 ...

Page 32: ... 10uF 50V M C1683 QETN1HM 106Z E CAPACITOR 10uF 50V M C1684 QETN1HM 106Z E CAPACITOR 10uF 50V M Ref No Part No Part Name Description Local C1685 QETN1HM 106Z E CAPACITOR 10uF 50V M C1686 QETN1HM 106Z E CAPACITOR 10uF 50V M C1687 QETN1HM 106Z E CAPACITOR 10uF 50V M C1688 QETN1HM 106Z E CAPACITOR 10uF 50V M C1689 QETN1CM 336Z E CAPACITOR 33uF 16V M C1701 NCB31HK 102X C CAPACITOR 1000pF 50V K C1702 Q...

Page 33: ...1J 102Y C RESISTOR 1kΩ 1 2W J R1501 NRSA63J 472X MG RESISTOR 4 7kΩ 1 16W J Ref No Part No Part Name Description Local R1502 NRSA63J 681X MG RESISTOR 680Ω 1 16W J R1504 NRSA63J 392X MG RESISTOR 3 9kΩ 1 16W J R1505 NRSA63J 154X MG RESISTOR 150kΩ 1 16W J R1506 NRSA63J 471X MG RESISTOR 470Ω 1 16W J R1507 NRSA63J 561X MG RESISTOR 560Ω 1 16W J R1508 NRSA63J 101X MG RESISTOR 100Ω 1 16W J R1509 NRSA63J 27...

Page 34: ...21J 103Y C RESISTOR 10kΩ 1 2W J R1941 QRG029J 180 OMF RESISTOR 18Ω 2W J R1942 QRE121J 5R6Y C RESISTOR 5 6Ω 1 2W J R1943 QRE121J 820Y C RESISTOR 82Ω 1 2W J R1991 QRZ9041 275 C RESISTOR 2 7MΩ 1 2W K L1101 QQLZ014 R39 COIL 0 39uH 100mA L L1131 QQL244K 220Z COIL 22uH K L1161 QQL244K 220Z COIL 22uH K L1232 QQL244K 560Z COIL 56uH K L1251 QQL244K 4R7Z COIL 4 7uH K L1281 QQL244K 150Z COIL 15uH K L1291 QQL...

Page 35: ...me Description Local 1 GQ10009 006B A PACKING CASE 2 GQ10021 001B A CUSHION ASSY 4pcs in 1set 3 CP30055 001 A TOP COVER 4 CP30056 009 A POLY BAG 5 QPA02503505 POLY BAG 25cm x 35cm 6 RM C1254G 1H REMOCON UNIT 7 LCT1319 001A A INST BOOK 8 BT 52006 1Q WARRANTY CARD 9 BT 51028 2Q REGISTRATION CARD 10 BATTERY x2 11 CM36616 001 A CORNER LABEL 2pcs in 1set 12 GQ30043 003A A TOP PAD 1 ...

Page 36: ...AV 20D304 No 52103 3 9 PACKING 2 6 5 7 8 9 10 3 12 4 11 1 2 2 11 ...

Page 38: ...e LIVE side GND and the ISOLATED NEUTRAL side GND simultaneously If the above caution is not respected an electric shock may be caused Therefore make sure that the power cord is surely removed from the receptacle when for example the chassis is pulled out 2 Do not short between the LIVE side GND and ISOLATED NEUTRAL side GND or never measure with a measuring apparatus measure with a measuring appa...

Page 39: ...2 5 MAIN PWB CIRCUIT DIAGRAM 2 5 PATTERN DIAGRAMS 2 9 MAIN PWB PATTERN 2 9 CHANNEL CHART US 2 11 CHANNEL CHART CA 2 12 TRANSISTOR BOTTOM VIEW FRONT VIEW TOP VIEW CHIP TR IC BOTTOM VIEW FRONT VIEW TOP VIEW CHIP IC TOP VIEW 1 N N 1 OUT E IN IN OUT E 1 N N 1 N N N 1 N E C B E C B C B E B C E G D S E C B E C B 2 2 ...

Page 40: ...01 MICOM V C DEF IC702 MEMORY IF Y C V1 L1 R1 L2 R2 L R AUDIO INPUT 2 AUDIO OUT T921 SW TRANSF MAIN PWB COMPO NENT INPUT IC101 IF DET Y Pb Pr TUNER IC851 IC651 IC251 SW Y C SEP AV SW Y C OUT Y C V1 V3 L1 R1 L2 R2 L3 R3 V Y Y C C L R OUT L R VTV MPX Y Pb Pr V LF901 R G B Y C Y Pb Pr AC IN ...

Page 41: ... 4 B1 F Q521 H OUT IC421 VERT OUT ITC H V HVT Q301 Q321 RGB DRV RM SW CRT SOCKET PWB IC602 AUDIO AMP L R L R CRT T521 DY01 VIDEO AUDIO INPUT 3 V3 L3 R3 L R H V L R R G B L R SP L SP R FOCUS SCREEN B HP L R Within MAIN PWB ...

Page 42: ...R3 FL3 A_MUTIN G ROT EXTR EXTL L R COM_IN SCL0 L R COUT YOUT AFT SDA1 LED FBP REMOCON BBE_SW EL1 ER1 V1 C1 EL2 CMP_Y2 ER2 VTV Y1 SDA0 SCL0 SDA0 SCL0 SCL1 CMP_PR CMP_Y CMP_PB V OUT HD AGC_ADJ AGC M KEY1 A_MUTING VOLTAGE V PIN NO VOLTAGE V PIN NO VOLTAGE V PIN NO IC101 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 IC201 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 ...

Page 43: ...167 R169 K101 C801 R115 R113 R006 Q281 Q291 R282 C834 Q352 R356 R354 D352 C352 D501 MTZJ3 3A T2 R757 R758 C615 N C613 N C006 C007 CN00C QGA2501F1 06 Q001 Q131 R691 R692 Q682 Q684 2 R684 R683 R686 R685 36 Y854 Y855 Y856 Y852 R631 QRX029J 3R3 C689 Q683 2 C293 D751 37 Y686 Y292 Y281 Q211 Q233 Q232 R217 R216 R215 R212 R234 R232 R233 R231 R235 C223 C233 L232 QQL29BJ 560Z C211 IC101 C162 C628 C167 Y685 ...

Page 44: ...QCZ0340 102 C930 QCB32HK 102Z C925 C931 QCB32HK 102Z C927 L922 QQL26AK 470Z C926 D921 D923 D922 C904 QCZ9054 102 C905 QCZ9054 102 L01 D924 IC901 STR G5624 F8 Q501 2SC4212 Z1 C508 QCB32HK 151Z C Q R509 R510 QRE121J 1 R508 R535 T921 QQS0158 001 QQS0203 001 C932 R931 R936 1 2W Q924 2SA1208 ST Z1 T D932 MTZJ33B T2 D929 MTZJ7 5A T2 R937 D930 C933 R929 1 2W R941 2WOMR IC921 AN7809F 9V C941 CN0PW K923 QQ...

Page 45: ...151Z C509 QCB32HK 331Z C510 R509 R510 QRE121J 103Y R508 R531 NRZ0032 7151 R532 R533 R534 D526 MA4068N Z1 T2 R535 C531 CN00U CN0HV CN0HV V K401 QQR0582 001Z IC421 AN5522 R406 R403 R405 R404 C406 C410 QFLC2AK 104Z C524 S401 QSL4A13 C02 R416 QRE121J 102Y R408 QRE121J 681Y C403 LC30381 001A D525 R512 R511 C532 Q521 2SD2634 YD R541 QRE121J 683Y C408 Y501 C521 C412 D522 RH1S T3 R526 QRK129J 150 L522 opt...

Page 46: ...2 R283 R285 R286 R287 R288 R292 R293 R294 R295 R296 R297 R298 R401 CL003 R501 R502 R503 R504 R601 R602 R603 R604 R606 R608 R609 R615 R616 R617 R618 R625 C673 C676 R661 R662 W653 W617 W654 R667 R666 W651 R668 R669 R681 R682 W801 W802 W715 W805 R701 R702 R703 R704 R705 R706 R707 R708 R709 R714 R716 R718 R721 R731 R732 R733 R734 R739 R740 R751 R752 R753 R754 R755 J001 R756 R768 R769 R770 R771 R772 R7...

Page 47: ...287 R288 R938 R402 R403 R404 R405 R406 R407 R408 R409 R410 R411 R412 R413 R414 R415 R416 R501 R502 R505 R506 R507 R508 R509 R510 R511 R512 R521 R522 R523 R524 R525 R526 R527 R528 R529 R530 R531 R532 R533 R534 R535 R603 R604 R605 R607 R608 R614 R616 R617 R618 R619 R620 R621 R622 R625 R627 R628 R629 R687 R688 R755 R764 R765 R766 R767 74 R775 R776 R777 R804 R805 R832 R856 R858 R859 R860 R939 R942 R94...

Page 48: ... I I VH MID SUPER HYPER ULTRA VL MODE TV REAL DISP W 35 W 36 W 37 W 38 W 39 W 40 W 41 W 42 W 43 W 44 W 45 W 46 W 47 W 48 W 49 W 50 W 51 W 52 W 53 W 54 W 55 W 56 W 57 W 58 W 59 W 60 W 61 W 62 W 63 W 64 W 65 W 66 W 67 W 68 W 69 W 70 W 71 W 72 W 73 W 74 W 75 W 76 W 77 W 78 W 79 W 80 W 81 W 82 W 83 W 84 A 8 A 4 A 3 A 2 A 1 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 100 101...

Page 49: ... II I VH MID SUPER HYPER ULTRA VL MODE TV REAL DISP W 35 W 36 W 37 W 38 W 39 W 40 W 41 W 42 W 43 W 44 W 45 W 46 W 47 W 48 W 49 W 50 W 51 W 52 W 53 W 54 W 55 W 56 W 57 W 58 W 59 W 60 W 61 W 62 W 63 W 64 W 65 W 66 W 67 W 68 W 69 W 70 W 71 W 72 W 73 W 74 W 75 W 76 W 77 W 78 W 79 W 80 W 81 W 82 W 83 W 84 A 8 A 4 A 3 A 2 A 1 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 100 10...

Page 50: ...WPC Printed in Japan AV 20D304 JVC SERVICE ENGINEERING COMPANY OF AMERICA DIVISION OF JVC AMERICAS CORP www jvcservice com US Only JVC CANADA INC Head office 21 Finchdene Square Scarborough Ontario M1X 1A7 416 293 1311 ...

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