JVC AV-20F703 Service Manual
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JVC AV-20F703 Service Manual

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SERVICE MANUAL
TV CATV
VCR DVD
POWER
STANDARD
INPUT
1
2
3
4
5
6
BBE
DISPLAY
7
8
9
SLEEP TIMER
0
RETURN
C.C.
LIGHT
AUDIO SELECT
RM-C309G
MUTING
ENTER
CH
VOL
VOL
CH
MENU
EXIT
– VCR CHANNEL +
VCR/DVD
TV/VCR
PREV NEXT
POWER
REW
PLAY
FF
REC
STOP
PAUSE
OPEN/CLOSE
STILL/PAUSE
TV
CONTENTS
a
SPECIFICATIONS ....................................................................................................................................2
a
OPERATING INSTRUCTIONS (APPENDIX)
a
SAFETY PRECAUTIONS ........................................................................................................................3
a
SPECIFIC SERVICE INSTRUCTIONS ....................................................................................................4
a
SERVICE ADJUSTMENTS ......................................................................................................................9
a
GUIDE FOR REPAIRING .......................................................................................................................14
a
STANDARD CIRCUIT DIAGRAM ........................................................................................................ 2-1
a
PARTS LIST ...........................................................................................................................................21
COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.
COLOR TELEVISION
AV-20F703
POWER
MC-Service
AV-20F703
No. 52001
May 2002

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  • Page 1 AV-20F703 SERVICE MANUAL COLOR TELEVISION AV-20F703 TV CATV VCR DVD POWER STANDARD INPUT DISPLAY SLEEP TIMER RETURN C.C. LIGHT AUDIO SELECT RM-C309G MUTING ENTER MENU EXIT – VCR CHANNEL + VCR/DVD TV/VCR PREV NEXT POWER PLAY POWER STOP PAUSE OPEN/CLOSE...
  • Page 2 AV-20F703 SPECIFICATIONS TELEVISION Picture Tube: 20” (measured diagonally) Color System: NTSC TV RF System: CCIR (M) Tuner Type: 181 Channel, Quartz PLL Frequency Synthesized Receiving Channels: 2-13 14-69 CATV 01-97 (5A)-(A-3) 98-99 (A-2)-(A-1) 14-22 (A)-(I) 23-36 (J)-(W) 37-65 (AA)-(FFF) 66-125 (GGG)-(125) Intermediate Frequency: Picture (FP) : 45.75 MHz...
  • Page 3 AV-20F703 SAFETY PRECAUTIONS 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 4 AV-20F703 SPECIFIC SERVICE INSTRUCTIONS DISASSEMBLY INSTRUCTIONS 3. After one side is removed, pull in the opposite direction to 1. REMOVAL OF ANODE CAP 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 5 AV-20F703 DISASSEMBLY INSTRUCTIONS 3. When IC starts moving back and forth easily after 2. REMOVAL AND INSTALLATION OF FLAT desoldering completely, pickup the corner of the IC using PACKAGE IC a tweezers and remove the IC by moving with the IC REMOVAL desoldering machine.
  • Page 6 AV-20F703 DISASSEMBLY INSTRUCTIONS INSTALLATION 4. When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thin- 1. Take care of the polarity of new IC and then install the tip Soldering Iron. (Refer to Fig. 2-8.) new IC fitting on the printed circuit pattern.
  • Page 7 VOL. (-) MIN If you set a factory initialization, the memories are reset such as the channel setting, and the POWER ON total hours. Remocon format selection. (JVC format NEC format) NOTE: Supplied remocon can not be operated at NEC format.
  • Page 8 AV-20F703 WHEN REPLACING EEPROM (MEMORY) IC If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to ensure correct data settings while making reference to TABLE 1. Table 1 Enter DATA SET mode by setting VOLUME to minimum.
  • Page 9 AV-20F703 SERVICE ADJUSTMENTS ELECTRICAL ADJUSTMENTS 1. ADJUSTMENT PROCEDURE 2. BASIC ADJUSTMENTS Read and perform these adjustments when repairing the circuits 2-1: CONSTANT VOLTAGE or replacing electrical parts or PCB assemblies. Set condition is AV MODE without signal. CAUTION Connect the digital voltmeter to the TP002.
  • Page 10 AV-20F703 ELECTRICAL ADJUSTMENTS 2-6: HORIZONTAL POSITION 2-11: SUB BRIGHTNESS Receive the monoscope pattern. Activate the adjustment mode display of Fig. 1-1 and Using the remote control, set the brightness and contrast press the channel button (16) on the remote control to to normal position.
  • Page 11 AV-20F703 ELECTRICAL ADJUSTMENTS 2-15: Confirmation of Fixed Value (step No.) Please check if the fixed values of the each adjustment items are set correctly referring below. FUNCTION H SIZE 100% V CENT VS CORR SUB CONT CONT CENT CONT MIN...
  • Page 12 AV-20F703 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 genera- Turn the unit on and let it warm up for at least 30 minutes tor.
  • Page 13 AV-20F703 ELECTRICAL ADJUSTMENTS 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) CP852B CRT PCB VM COIL PCB CP804 CD803 CP803 J801 CP801_1 CP851_1 CD801 CP801A CP101 CP851A FB401 CP401 T501 SPEAKER R527 CP502 L503 VR502 TP002 AC IN CP1001 MAIN PCB MC-Service No.
  • Page 14 AV-20F703 GUIDE FOR REPAIRING IC DESCRIPTION MAIN PCB OEC7075A (IC101) Pin name Symbol I/O Logic Function Option P11/SCL1 AUDIO MUTE Audio MUTE Output C-MOS P00/PM0 EXT MUTE Audio MUTE Output for external Output Nch-OD P01/PWM1 STANDBY_H Output HIGH at a teleevision power off.
  • Page 15 AV-20F703 TROUBLESHOOTING GUIDE NO POWER Is the voltage at the point (A) Is the voltage at pin G Check Q502 and associated circuit. in the Figure DC160V ? of Q502 DC5V ? Check Q514 and associated circuit. T502 Is the voltage at the point (B) Check R501 and R541.
  • Page 16 AV-20F703 TROUBLESHOOTING GUIDE NO RASTER Does the RASTER Is the voltage of pin 1 of Check the output circuit and appear at maximum associated circuit. CP801 DC180V ? BRIGHT/CONTRAST ? Check the 180V line. Is the high voltage of Is the heater voltage at...
  • Page 17 AV-20F703 TROUBLESHOOTING GUIDE NO COLOR Are the waveforms at pins 6, Defect of CRT or contact defects 8 and 11 of J801 normal ? of J801. Are the waveforms at pins 6, Check the output circuit and 7 and 8 of CP801 normal ? associated circuit.
  • Page 18 AV-20F703 TROUBLESHOOTING GUIDE NO VERTICAL Is the waveform at pin Check DY. 6 of CP401 normal ? Check IC401 and check the Is the waveform at pin Is the voltage at pin 2 peripheral circuit. 1 of IC401 normal ? of IC401 25V? Check the 25V line.
  • Page 19 AV-20F703 TROUBLESHOOTING GUIDE NO SOUND Is sound setting appropriate ? Is the waveform at pins 7 Check speaker. and 12 of IC1001? Is the AUDIO signal at pins Check IC1001 and peripheral circuit. 7 and 14 of IC301? Is the AUDIO signal at pins...
  • Page 20 AV-20F703 TROUBLESHOOTING GUIDE NO CCD Is the video signal at pin Check IC1001 and check 26 of IC101 ? peripheral circuit. Is the video signal at Check IC701 and check pin 31 of IC701 ? peripheral circuit. Check IC601 and check paripheral circuit.
  • Page 21 AV-20F703 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 .
  • Page 22 AV-20F703 MECHANICAL REPLACEMENT PARTS LIST ! Ref.No. Part No. Part Name Description X-A3K6060720 CABINET,FRONT ASSY X-7230006818 SHEET,CAUTION X-713WPA0140 GLASS,LED X-735WPA0538 BUTTON,HOLDER X-7235380003 BRAND,BADGE X-735WPA0539 BUTTON,CHANNEL/VOLUME X-735WPB0102 BUTTON,POWER X-702WPAA270 CABINET,BACK X-722538A019 SHEET,RATING X-800WQ0A008 FELT SHEET X-741WUA0001 SPRING,EARTH X-762WPA0011 HOLDER,CRT WIRE X-899HV3T000...
  • Page 23 AV-20F703 MECHANICAL EXPLODED VIEW PCB110 (CRT PCB) PCB060 (VM COIL PCB) L503 X-028R200024 FB401 X-043220053R V801 X-098W210437 PCB010 SP1002 (MAIN PCB) X-070C457003 TU001 X-0145100059 SP1001 X-070C457003 No. 52001...
  • Page 24 AV-20F703 ELECTRICAL REPLACEMENT PARTS LIST MAIN PCB ASS’Y ! Symbol No. ! Symbol No. Part No. Part Name Description Part No. Part Name Description PCB010 X-A3K6060010 MAIN PCB ASS’Y TMA532B RESISTORS R314 NRSA02J-682X MG R 6.8kØ 1/10W VARIABLE RESISTORS R319...
  • Page 25 AV-20F703 ! Symbol No. ! Symbol No. Part No. Part Name Description Part No. Part Name Description RESISTORS RESISTORS ! R554 X-R002T2104J 100kØ 1/2W R1506 NRSA02J-332X MG R 3.3kØ 1/10W R601 NRSA02J-184X MG R 180kØ 1/10W R1507 NRSA02J-102X MG R 1kØ...
  • Page 26 AV-20F703 ! Symbol No. ! Symbol No. Part No. Part Name Description Part No. Part Name Description CAPACITORS CAPACITORS C313 QETN1CM-107Z 100µF C619 X-E02LT0471M 470µF 6.3V C314 QEKJ1CM-106Z 10µF C623 NCB21HK-103X 0.01µF C315 QETN1AM-227Z 220µF C624 QETN1AM-107Z 100µF C325 NCB21HK-103X 0.01µF...
  • Page 27 AV-20F703 ! Symbol No. ! Symbol No. Part No. Part Name Description Part No. Part Name Description CAPACITORS DIODES C1010 NCB21HK-103X 0.01µF D610 MTZJ5.6B-T2 ZENER C1011 X-E02LT3221M 220µF D611 1SS133-T2 SILICON C1012 NCB21HK-103X 0.01µF D612 1SS133-T2 SILICON C1501 QETN0JM-107Z 100µF 6.3V...
  • Page 28 AV-20F703 ! Symbol No. ! Symbol No. Part No. Part Name Description Part No. Part Name Description COILS OTHERS L002 X-021673101K COIL 100µH FH502 X-06710T0006 HOLDER,FUSE EYF-52BC L201 X-02167F101J COIL 100µH OS101 X-773071001 REMOTE RECEIVER RPM7138-H5 ! RY501 L203 X-021LA61R5K COIL 1.5µH...
  • Page 29 AV-20F703 ! Symbol No. ! Symbol No. Part No. Part Name Description Part No. Part Name Description RESISTORS COILS R874 QRE141J-683Y 68kØ 1/4W L802 X-021673151K COIL 150µH R875 QRE141J-122Y 1.2kØ 1/4W L803 X-021673151K COIL 150µH R876 QRE141J-123Y 12kØ 1/4W L804...
  • Page 30 AV-20F703 PACKING 1,8,9,10,11,12,13 ACCESSORY REPLACEMENT PARTS LIST ! Ref.No. Part No. Part Name Description X-076G0EC010 TRANSMITTER EUR524339(RM-C309G) X-723000B871 SHEET,UPC X-791WHA0085 LAMIFILM,BAG X-792WHA0321 PACKAGE,TOP X-792WHA0322 PACKAGE,BOTTOM X-793WCDB254 GIFT BOX X-JB5KD500 POLYBAG,INSTRUCTION(RED CAUTION) X-J3L30301 INSTRUCTION BOOK X-J5500112 GUARANTEE CARD X-J5500115 SERVICE STATION LIST...
  • Page 31 AV-20F703 SCHEMATIC DIAGRAMS COLOR TELEVISION AV-20F703 CD-ROM No. SML200206 TV CATV VCR DVD POWER STANDARD INPUT DISPLAY SLEEP TIMER RETURN C.C. LIGHT AUDIO SELECT RM-C309G MUTING ENTER MENU EXIT – VCR CHANNEL + VCR/DVD PREV NEXT POWER TV/VCR PLAY POWER...

  • Page 32: Table Of Contents

    AV-20F703 AV-20F703 STANDARD CIRCUIT DIAGRAM CONTENTS SEMICONDUCTOR BASE CONNECTIONS ..............2-2 BLOCK DIAGRAM ......................2-3 SCHEMATIC DIAGRAMS ....................2-5 MAIN PCB MICON/TUNER SCHEMATIC DIAGRAM MAIN PCB CHROMA/IF SCHEMATIC DIAGRAM MAIN PCB DEFLECTION SCHEMATIC DIAGRAM MAIN PCB POWER SCHEMATIC DIAGRAM MAIN PCB SOUND SCHEMATIC DIAGRAM...

  • Page 33: Semiconductor Base Connections

    AV-20F703 SEMICONDUCTOR BASE CONNECTIONS DIODE CATHODE ANODE 1N4937 10ELS6N-TA1B2 10ELS2N-TA1B2 SLR-342VCT32 1SS133T-77 11E1-EIC RM11C-EIC AU02A-EIC 30DF6-FC RU-4AM MTZJ12B T-77 SB290S MTZJ15B T-77 MTZJ18B T-77 MTZJ30B T-77 MTZJ33A T-77 MTZJ5.6B T-77 MTZJ6.2B T-77 MTZJ8.2B T-77 MTZJ9.1BT-77 KIA7805API TB1253N M62420SP AN5829S NJM2150AM...

  • Page 34: Block Diagram

    AV-20F703 AV-20F703 BLOCK DIAGRAM SPEAKER SPEAKER SP1002 SP1001 TU001 DEFLCTION SIGNAL MICON IC AUDIO SIGNAL MC-Service IC101 OEC7075A TUNER AUDIO SIGNAL G. SIGNAL J1001 SYNC RESET IC COLOR SIGNAL IC103 PST600C LUMINANCE SIGNAL H SYNC HEAD TUNER VIDEO SIGNAL PHONE JACK IC503 B.

  • Page 35: Schematic Diagrams

    AV-20F703 AV-20F703 SCHEMATIC DIAGRAMS [MAIN PCB MICON/TUNER SCHEMATIC DIAGRAM] MICON/TUNER SCHEMATIC DIAGRAM (MAIN PCB) OS101 RPM7138-H5 ACCESORY TU001 ENV56DB6G3 TEST POINT BT001 CP101 173979-7 R6P(AR)XICI R003 I2C_SCL TM101 330K I2C_SDA BT002 R111 EUR524339 R6P(AR)XICI I2C_OFF H-BUFFER Q102 KTC3875S_ Y_RTK C003...

  • Page 36: Main Pcb Chroma/If Schematic Diagram

    AV-20F703 AV-20F703 [MAIN PCB CHROMA/IF SCHEMATIC DIAGRAM] CHROMA/IF SCHEMATIC DIAGRAM (MAIN PCB) FROM/TO AV C_V_OUT_SW Y_V_OUT_SW FROM/TO MICON/TUNER TUNER_VIDEO R214 SYNC_OUT TUNER_AUDIO_L AUDIO TUNER_AUDIO_R BUFFER C213 Q201 KTC3875S_ OSD_B Y_RTK OSD_G C615 R608 FROM AV OSD_R C212 1/4W W820 R205 TV BUFFER 0.01 B...

  • Page 37: Main Pcb Deflection Schematic Diagram

    AV-20F703 AV-20F703 [MAIN PCB DEFLECTION SCHEMATIC DIAGRAM] DEFLECTION SCHEMATIC DIAGRAM (MAIN PCB) V.OUTPUT IC IC401 AN5522 THERMAL PROTECTION PUMP UP 25.0 12.0 25.0 R407 4.7K MC-Service C411 R414 500V 39K +-1% R417 33K TO DY V801 CP401 A51LVV896X07(O) B06B-DVS C418...

  • Page 38: Main Pcb Power Schematic Diagram

    AV-20F703 AV-20F703 [MAIN PCB POWER SCHEMATIC DIAGRAM] POWER SCHEMATIC DIAGRAM (MAIN PCB) 6.3A 125V CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE 6.3A 125V(F501) MC-Service ATTENTION: POUR UNE PROTECTION CONTINUE LES RISQUES D'INCEIE N'UTILISER QUE DES FUSIBLE DE MEME TYPE 6.3A 125V(F501)

  • Page 39: Main Pcb Sound Schematic Diagram

    AV-20F703 AV-20F703 [MAIN PCB SOUND SCHEMATIC DIAGRAM] SOUND SCHEMATIC DIAGRAM (MAIN PCB) MC-Service FROM AV R314 SW_AUDIO_R 6.8K R324 C334 SW_AUDIO_L 1.8K 0.033 B C332 R326 C331 0.47 B 100 1/4W 0.022 R328 1.8K TONE 136K R301 C306 R303 C308...

  • Page 40: Main Pcb Av Schematic Diagram

    AV-20F703 AV-20F703 [MAIN PCB AV SCHEMATIC DIAGRAM] AV SCHEMATIC DIAGRAM (MAIN PCB) TO CHROMA/IF CD701A CH243001 YUV_IN(REAR) J704 MSP-213V1-652_PBSN MC-Service A/V_OUT(REAR) J708 MSP-213V2-432_PBSN LINE2(REAR) J703 FROM POWER MSP-213V2-432_PBSN L703 P.CON+9V 47uH 0305 C713 R751 C714 R752 FROM/TO COMB/FILTER C715 SW_VIDEO_OUT...

  • Page 41: Main Pcb Comb/Filter Schematic Diagram

    AV-20F703 AV-20F703 [MAIN PCB COMB/FILTER SCHEMATIC DIAGRAM] COMB/FILTER SCHEMATIC DIAGRAM (MAIN PCB) MC-Service L1505 L1511 15uH 0305 15uH C1523 0305 120P CH 8.78 3.80 BUFFER BUFFER 4.92 8.15 Q1506 Q1503 W852 C1513 2.77 KTA1504S_Y 1.50 KTC3875S_Y_RTK 0.1 B BUFFER 2.14...

  • Page 42: Crt Pcb And Vm Coil Pcb Schematic Diagrams

    AV-20F703 AV-20F703 [CRT PCB AND VM COIL PCB SCHEMATIC DIAGRAMS] CRT PCB SCHEMATIC DIAGRAM PCB110 TCA391 TP804 R828 2.7K 1/4W RED AMP Q801 123.5 R813 KTC4217 220 1/4W MC-Service D801 VM+12V IC 1SS133 RED AMP IC851 Q810 R801 KIA78L12BP-AT KTC3199_Y...

  • Page 43: Pattern Diagrams

    AV20F703 AV-20F703 PATTERN DIAGRAMS [MAIN PCB PATTERN (INSERTED PARTS)] MC-Service W006 W826 CP801A D411 J702 CP101 D407 J701 J703 J704 J708 W158 C427 L703 W801 CD701A CP851A R734 C428 W850 W065 W813 W064 IC701 W063 C418 D001 CP401 C004 W096...
  • Page 44 AV-20F703 AV-20F703 [MAIN PCB PATTERN (CHIP MOUNTED PARTS)] MC-Service Q705 Q108 R737 R104 Q704 R731 IC198 R510 Q1503 R1507 R1506 C336 C554 C129 C920 R155 R319 R1504 C334 R532 Q509 C928 R111 R324 C1514 C926 C127 C330 C923 C333 R303...

  • Page 45: Crt Pcb Pattern

    AV-20F703 AV-20F703 [CRT PCB PATTERN] CP851_1 R878 R879 C862 R855 B851 B852 C867 CP801_1 Q851 Q859 C868 C809 C866 C854 CD811 W007 Q858 C853 R851 R857 W004 R880 Q852 Q854 D857 D856 R870 MC-Service R852 B801 R856 C813 R864 D858...

  • Page 46: Waveforms

    AV-20F703 WAVEFORMS MICON/TUNER 1 1V 0.1µs/div 1V 20µs/div 11 0.5V 20µs/div 2 1V 1µs/div 7 1V 20µs/div 12 1V 2µs/div 0.5V 10ms/div 3 1V 50µs/div 13 1V 20µs/div 4 1V 0.1ms/div 9 1V 50µs/div 14 2V 20µs/div CHROMA/IF 10 2V 20µs/div 5 1V 50µs/div...
  • Page 47 AV-20F703 DEFLECTION 16 2V 5ms/div 21 200V 50µs/div 26 5V 2ms/div SOUND 22 2V 5ms/div 27 5V 2ms/div 17 20V 5ms/div 23 2V 5ms/div 18 10V 10ms/div 28 200mV 20µs/div 24 2V 5ms/div 29 200mV 20µs/div 19 20V 20 s/div 20 2V 20µs/div...
  • Page 48 AV-20F703 31 1V 50µs/div 38 50V 20µs/div 39 50V 20µs/div 32 2V 5ms/div 33 2V 5ms/div 34 500mV 20µs/div 37 50V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.

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