JVC AV-20D304/SA Service Manual
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JVC AV-20D304/SA Service Manual

JVC AV-20D304/SA Service Manual

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  • Page 2 AV-20D304 SERVICE MANUAL COLOR TELEVISION 52103 2003 AV-20D304 BASIC CHASSIS TABLE OF CONTENTS PRECAUTIONS ............... 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 3 AV-20D304 SPECIFICATION Items Contents Dimensions (W x H x D) 59.2cm x 45.6cm x 48.7cm (23-3/8” x 18” x 19-1/4”) Mass 20.4kg (45 Ibs) TV RF System CCIR(M) Color Sound System NTSC, BTSC system (Multi Channel Sound) TV Receiving Channels and Frequency VL Band 02ch~06ch : 54MHz~88MHz VH Band...
  • Page 4 AV-20D304 SECTION 1 PRECAUTIONS 1.1 SAFETY PRECAUTIONS (10) Isolation Check (Safety for Electrical Shock Hazard)After re-assembling the (1) The design of this product contains special hardware, many circuits product, always perform an isolation check on the exposed metal and components specially for safety purposes. For continued parts of the cabinet (antenna terminals, video/audio input and output protection, no changes should be made to the original design unless terminals, Control knobs, metal cabinet, screwheads, earphone jack,...
  • Page 5 AV-20D304 SECTION 2 SPECIFIC SERVICE INSTRUCTIONS 2.1 FUNCTIONS [FRONT PANEL] MENU CHANNEL VOLUME POWER [REAR PANEL] [REMOTE CONTROL UNIT] (RM-C1254G) 1-4 (No.52103)
  • Page 6 AV-20D304 2.2 DISASSEMBLY PROCEDURE 2.2.1 REMOVING THE REAR COVER 2.2.4 CHECKING THE PW BOARD (1) Unplug the power plug. • Remove the REAR COVER. (2) As shown in the Fig.1, remove the 9 screws [A]. (1) Pull out the MAIN CHASSIS (refer to REMOVING THE (3) As shown in Fig.1, remove the 4 screws [B].
  • Page 7 AV-20D304 FEONT CABINET SPEAKER CRT SOCKET PWB MAIN PWB SPEAKER PWB STOPPER REAR COVER POWER CORD Fig.1 1-6 (No.52103)
  • Page 8 AV-20D304 2.3 MEMORY IC REPLACEMENT 2.3.1 MEMORY IC This TV use memory IC. In the memory IC, there are memorized data for correctly operating the video and deflection circuits. When replacing the memory IC, be sure to use IC written with the initial values of data. 2.3.2 PROCEDURE FOR REPLACING MEMORY IC (1) Power off Switch the power off and unplug the power cord from the outlet.
  • Page 9 AV-20D304 2.3.3 USER SETTING VALUES Setting item Setting value Setting item Setting value REMOTE CONTROL UNIT KEY POWER DISPLAY CHANNEL CH-02 VIDEO STATUS DYNAMIC VOLUME HYPER SURROUND TV/VIDEO SETTING OF MENU PICTURE MODE INITIAL SETUP MODE TINT Center LANGUAGE COLOR Center FRONT PANELLOCK PICTURE...
  • Page 10 AV-20D304 2.4 REPLACEMENT OF CHIP COMPONENT 2.4.1 CAUTIONS (1) Avoid heating for more than 3 seconds. (2) Do not rub the electrodes and the resist parts of the pattern. (3) When removing a chip part, melt the solder adequately. (4) Do not reuse a chip part after removing it. 2.4.2 SOLDERING IRON (1) Use a high insulation soldering iron with a thin pointed end of it.
  • Page 11 AV-20D304 SECTION 3 ADJUSTMENT 3.1 ADJUSTMENT PREPARATION (1) There are 2 ways of adjusting this TV : One is with the REMOTE CONTROL UNIT and the other is the conventional method using adjustment parts and components. (2) The adjustment using the REMOTE CONTROL UNIT is made on the basis of the initial setting values. The setting values which adjust the screen to the optimum condition can be different from the initial setting values.
  • Page 12 AV-20D304 3.3 ADJUSTMENT LOCATIONS CRT SOCKET PWB (Within MAIN PWB ASS'Y) TP-B CRT EARTH (BRAIDED ASS'Y) TP-E (SOLDER SIDE) FRONT MAIN PWB VOL+ VOL- MENU POWER POWER MEMORY IC702 F901 IC201 T111 IC101 S401 TUNER UPPER : FOCUS AV IN / OUT LOWER : SCREEN Fig.1 (No.52103)1-11...
  • Page 13 AV-20D304 3.4 BASIC OPERATION OF SERVICE MENU 3.4.1 TOOL OF SERVICE MENU OPERATION Operate the SERVICE MENU with the REMOTE CONTROL UNIT. 3.4.2 SERVICE MENU ITEMS With the SERVICE MENU, various adjustments can be made, and they are broadly classified in the following items of settings. V/C (S) This mode adjusts the VIDEO and CHROMA control circuit.
  • Page 14 AV-20D304 3.4.3 BASIC OPERATION IN SERVICE MENU 3.4.3.1 HOW TO ENTER THE SERVICE MENU SERVICE MENU (1) Press the [SLEEP TIMER] key and set the SLEEP TIMER 2.DEF(D) for "0 MIN". 1.V/C(S) 3.SOUND(A) 4.OTHERS(F) Then press the [DISPLAY] key and [VIDEO STATUS] key of the remote control unit at the same time to enter the 7.LOW LIGHT 8.HIGH LIGHT...
  • Page 15 AV-20D304 3.4.4 SERVICE MENU FLOW CHART SERVICE MENU (MAIN MENU) 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 EXIT 7.LOW LIGHT 1.V/C(S) 4 : 3 BRIGHT BRIGHT 8.HIGH LIGHT 2.DEF(D) 4 : 3 V FREQ...
  • Page 16 AV-20D304 3.5 INITIAL SETTING VALUE OF SERVICE MENU (1) Adjustment of the SERVICE MENU is made on the basis of the initial setting values. However, the new setting values which displays on the screen in its optimum condition may differ from the initial setting value. (2) Do not change the initial setting values of the items not listed in "ADJUSTMENT PROCEDURE".
  • Page 17 AV-20D304 3.5.2 [2.DEF] Initial setting value Setting item Variable range EXTERNAL (SV / CV) AFC GAIN H POSI 0~31 V SIZE 0~125 V S CORR 0~15 V LIN 0~15 H SIZE 0~63 WVMT TOP WVMT BTM EWCR TOP 0~31 EWCR BTM 0~31 EW PARA 0~63...
  • Page 18 AV-20D304 3.6 ADJUSTMENTS PROCEDURE 3.6.1 CHECK ITEM Measuring Item Test point Adjustment part Description instrument B1 POWER DC voltmeter B1 Connector (1) Receive the black and white signal. (color off) SUPPLY TP-91 (2) Connect the DC voltmeter to TP-91 (B1 connector 1 Signal TP-E pin) and TP-E (B1 connector 3 pin).
  • Page 19 AV-20D304 3.6.4 FOCUS Measuring Item Test point Adjustment part Description instrument FOCUS Signal FOCUS VR (1) Receive the crosshatch signal. generator [In HVT] (2) While looking at the screen, adjust the FOCUS VR to the vertical and horizontal lines will be clear and in fine detail.
  • Page 20 AV-20D304 3.6.6 VIDEO CIRCUIT Measuring Item Test point Adjustment part Description instrument WHITE Signal [7.LOW LIGHT] (1) Receive the black and white signal ( color off ). BALANCE generator (2) Select the 7.LOW LIGHT in the SERVICE MENU. (LOW LIGHT) [1.V/C(S)] (3) Set the initial setting value of <S11>(R CUTOFF), Remote...
  • Page 21 AV-20D304 Measuring Item Test point Adjustment part Description instrument WHITE Signal [8.HIGH LIGHT] (1) Receive the black and white signal ( color off ). BALANCE generator (2) Select the 8.HIGH LIGHT in the SERVICE MENU. (HIGH LIGHT) [1.V/C(S)] (3) Set the initial setting value of <S14>(R DRIVE) and Remote S14 : R DRIVE <S15>(B DRIVE) with the [4], [6], [7] and [9] keys.
  • Page 22 AV-20D304 Measuring Item Test point Adjustment part Description instrument SUB COLOR Signal TP-B [1.V/C(S)] [ Method of adjustment without measuring instrument ] generator TP-E S03 : COLOR (1) Receive the broadcast. [CRT SOCKET (2) Select <S03>(COLOR) of the 1.V/C(S). Oscilloscope PWB] (3) Set the initial setting value of the <S03>...
  • Page 23 AV-20D304 3.6.7 MTS CIRCUIT Measuring Item Test point Adjustment part Description instrument MTS INPUT Remote [3.SOUND(A)] (1) Select the <A01>(IN LEVEL) of the 3.SOUND. LEVEL control unit A01 : IN LEVEL (2) Verify that the <A01> is set at its initial setting value. Variable Initial setting Setting item...
  • Page 24 AV-20D304 3.6.8 PURITY AND CONVERGENCE PURITY ADJUSTMENT (1) Demagnetize CRT with the demagnetizer. WEDGE DEFLECTION YOKE (2) Loosen the retainer screw of the deflection yoke. (3) Remove the wedges. (4) Input a green raster signal from the signal generator, and turn the screen to green raster.
  • Page 25 AV-20D304 STATIC CONVERGENCE ADJUSTMENT (1) Input a crosshatch signal. (2) Using 4-pole convergence magnets, overlap the red and blue lines in the center of the screen (Fig.1) and turn them (FRONT VIEW) to magenta (red/blue). (3) Using 6-pole convergence magnets, overlap the magenta (red/blue) and green lines in the center of the screen and turn them to white.
  • Page 26 AV-20D304 3.6.9 HOW TO CHECK THE HIGH VOLTAGE HOLD DOWN CIRCUIT 3.6.9.1 HIGH VOLTAGE HOLD DOWN CIRCUIT After repairing the high voltage hold down circuit shown in Fig.1. This circuit shall be checked to operate correctly. 3.6.9.2 CHECKING OF THE HIGH VOLTAGE HOLD DOWN CIRCUIT (1) Turn the power switch to on.
  • Page 27 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 (No.52103) Printed in Japan 200302WPC...
  • Page 28 AV-20D304 PARTS LIST CAUTION  The parts identified by the symbol are important for the safety . Whenever replacing these parts, be sure to use specified ones to secure the safety. The parts not indicated in this Parts List and those which are filled with lines --- in the Parts No. columns will not be supplied. P.

  • Page 29: Table Of Contents

    Local  GQ30025-002A-A CONTROL KNOB  LC30191-004A-A REMOCON LENS  GQ30026-002A-A POWER KNOB CM43094-009-H JVC MARK  100 GQ10020-001B-A F CABINET ASSY Inc. 101  101 GQ30024-002A-A DOOR EXPLODED VIEW - 1 EXPLODED VIEW PARTS LIST - 2  Ref.No.

  • Page 30: Exploded View - 1

    AV-20D304 EXPLODED VIEW - 2 DY01 CRT SOCKET PWB (Within MAIN PWB) T1521 MAIN PWB (x4) (x9) (No.52103)3-3...

  • Page 31: Printed Wiring Board Parts List

    AV-20D304 PRINTED WIRING BOARD PARTS LIST Ref No. MAIN PW BOARD ASS’Y(SFE-1031A-M2) Part No. Part Name Description Local Ref No. Part No. Part Name Description Local D1803 MTZJ9.1C-T2 Z.DIODE I M D1804 MTZJ9.1C-T2 Z.DIODE I M IC1101 M52342SP D1807 MTZJ9.1C-T2 Z.DIODE I M IC1201 TM8812CPDNG4N35 IC(MCU)
  • Page 32 AV-20D304 Ref No. Ref No. Part No. Part Name Description Local Part No. Part Name Description Local C1277 NCB31HK-103X C CAPACITOR 0.01uF 50V K C1685 QETN1HM-106Z E CAPACITOR 10uF 50V M C1278 NCB31HK-103X C CAPACITOR 0.01uF 50V K C1686 QETN1HM-106Z E CAPACITOR 10uF 50V M C1283...
  • Page 33 AV-20D304 Ref No. Ref No. Part No. Part Name Description Local Part No. Part Name Description Local R1133 NRSA63J-821X MG RESISTOR 820Ω 1/16W J R1502 NRSA63J-681X MG RESISTOR 680Ω 1/16W J R1134 NRSA63J-681X MG RESISTOR 680Ω 1/16W J R1504 NRSA63J-392X MG RESISTOR 3.9kΩ...
  • Page 34 AV-20D304 Ref No. Ref No. Part No. Part Name Description Local Part No. Part Name Description Local T1901 R1755 NRSA63J-562X MG RESISTOR 5.6kΩ 1/16W J QQT0355-001 POWER TRANSF T1921 R1756 NRSA63J-122X MG RESISTOR 1.2kΩ 1/16W J QQS0158-001 SW TRANSF R1757 NRSA63J-101X MG RESISTOR 100Ω...

  • Page 35: Remote Control Unit Parts List (Rm-C1254G-1H)

    AV-20D304 REMOTE CONTROL UNIT PARTS LIST (RM-C1254G-1H)  Ref.No. Part No. Part Name Description Local UR77EC0603 BATTERY COVER PACKING PARTS LIST  Ref.No. Part No. Part Name Description Local GQ10009-006B-A PACKING CASE GQ10021-001B-A CUSHION ASSY 4pcs in 1set CP30055-001-A TOP COVER CP30056-009-A POLY BAG QPA02503505...

  • Page 36: Packing

    AV-20D304 PACKING (No.52103)3-9...
  • Page 37 AV-20D304 SCHEMATIC DIAGRAMS COLOR TELEVISION 52103 2003 AV-20D304 BASIC CHASSIS CD-ROM No.SML200304 No.52103 COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD. 2003/02...
  • Page 38 AV-20D304 AV-20D304 STANDARD CIRCUIT DIAGRAM NOTE ON USING CIRCUIT DIAGRAMS 1.SAFETY Type The components identified by the symbol and shading are No indication :Ceramic capacitor critical for safety. For continued safety replace safety critical :Metalized mylar capacitor :Polypropylene capacitor components only with manufactures recommended parts. :Metalized polypropylene capacitor :Metalized film capacitor 2.SPECIFIED VOLTAGE AND WAVEFORM VALUES...
  • Page 39 AV-20D304 CONTENTS SEMICONDUCTOR SHAPES ..............2-2 BLOCK DIAGRAM ..................2-3 CIRCUIT DIAGRAMS ..................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 SEMICONDUCTOR SHAPES TRANSISTOR BOTTOM VIEW FRONT VIEW...

  • Page 40: Block Diagram

    AV-20D304 BLOCK DIAGRAM TU001 IC101 IC651 TUNER IF DET L/R OUT INPUT 1 L1/R1 VIDEO IC851 AUDIO L2/R2 IC251 AV SW Y/C SEP L3/R3 AUDIO R/G/B Y/C OUT COMPO- -NENT Y/Pb/Pr INPUT INPUT 2 AUDIO Y/Pb/Pr IC201 MICOM/V/C/DEF IC702 MEMORY MAIN PWB AC IN T921...
  • Page 41 AV-20D304 INPUT 3 VIDEO AUDIO Q301 R/G/B Q321 CRT SOCKET (Within MAIN PWB) IC602 AUDIO AMP SP L L , R SP R Q521 H.OUT IC421 VERT OUT DY01 T521 (ITC) FOCUS SCREEN No.52103...

  • Page 42: Circuit Diagrams

    AV-20D304 CIRCUIT DIAGRAMS MAIN PWB CIRCUIT DIAGRAM (1/2) SHEET 1 VOLTAGE (V) VOLTAGE (V) VOLTAGE (V) PIN NO. PIN NO. PIN NO. IC101 MAIN PWB (1/2) S751 QSW0619-003 Z SFE-1031A-M2 IC602 R751 13.5 Q001 12.4 13.5 Q101 R652 12.3 KEY1 R653 C657 Q131...
  • Page 43 AV-20D304 J007 J006 J005 QNN0282-001 QNN0281-00 2 QNN0281-003 IC751 J008 GP1UM281QK S752 S753 S754 S755 S756 QNS0155-001 619-003 Z QSW0619-003 Z QSW0619-003Z QSW0619-003Z QSW0619-003 Z QSW0619-003Z Q751 R758 R687 R688 R756 1.2k R804 C751 C687 C688 47/25 R628 R629 D751 R757 10/50 10/50...
  • Page 44 AV-20D304 MAIN PWB CIRCUIT DIAGRAM (2/2) SHEET 2 IC421-3,6 Q301-C Q311-C Q321-C VOLTAGE ( V ) VOLTAGE ( V ) PIN NO. PIN NO. PIN N IC421 27.2 IC922 38Vp-p 150Vp-p 160Vp-p 120Vp-p Q501-B Q501-C Q521-B Q521-C 16.1 28.3 Q301 IC901 159.9 139.0...
  • Page 45 AV-20D304 CRT SOCKET PWB SK351 A51KRE89X(DT) CRT SOCKET (Within MAIN PWB) R302 R303 2WOMR 1.5k1/2W SFE-1031A-M2 Q301 2SC4075/DE/YA11 R301 VOLTAGE ( V ) VOLTAGE ( V ) VOLTAGE ( V ) PIN NO. PIN NO. C302 330p5% C301 167.3 R305 R306 Q331 Q922...

  • Page 46: Pattern Diagrams

    AV-20D304 PATTERN DIAGRAMS MAIN PWB PATTERN R903 Y855 Y854 R902 C909 W920 R907 R831 R802 J002 D903 D902 R908 R006 R906 J004 W919 R803 R833 R005 C910 Y686 J003 D684 C683 D833 R691 Y856 C833 C007 Y685 D906 C907 W802 C832 Q681 D832...
  • Page 47 AV-20D304 R534 R533 TU001 D522 R006 R532 R005 FRONT C531 R526 Y686 R531 D833 C001 D526 C007 R003 R939 C832 D524 C004 R004 R938 C006 W508 D831 C003 D521 R936 C002 T521 D932 W131 R528 R541 Y101 C005 C526 C102 R105 C101 C525...

  • Page 48: Channel Chart (Us)

    AV-20D304 CHANNEL CHART (US) MODE CHANNEL MODE CHANNEL TUNER TUNER BAND BAND BAND BAND CATV REAL DISP. CATV 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...

  • Page 49: Channel Chart (Ca)

    AV-20D304 CHANNEL CHART (CA) MODE CHANNEL MODE CHANNEL TUNER TUNER BAND BAND BAND BAND CATV REAL DISP. CATV 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...
  • Page 50 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 (No.52103) Printed in Japan 200302WPC...

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