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JVC AV-20FD24 Service Manual
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JVC AV-20FD24 Service Manual

JVC AV-20FD24 Service Manual

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SERVICE MANUAL
POWER
TV CATV
PLAY MODE
DISPLAY
SLEEP
AUDIO
TIMER
AUDIO
TITLE
1
2
3
4
5
6
SUBTITLE
JUMP
7
8
9
ANGLE
C.C.
0
RETURN
MARKER ZOOM
REPEATA-B RETURN
-
SLOW
+
CANCEL
LIGHT
SELECT
MUTING
/ENTER
+
CH
VOL
INPUT
VOL
-
+
CH
-
TV MENU
DVD SETUP
PREV
NEXT
TV/DVD
DVD MENU
B.SEARCH
PLAY
F.SEARCH
OPEN/CLOSE
STOP
PAUSE/STILL
TV / DVD
CONTENTS
q SPECIFICATIONS .............................................................................................................................................. 2
q OPERATING INSTRUCTIONS (APPENDIX)
q SAFETY PRECAUTIONS .................................................................................................................................. 3
q SPECIFIC SERVICE INSTRUCTIONS .............................................................................................................. 7
q SERVICE ADJUSTMENTS .............................................................................................................................. 19
q GUIDE FOR REPAIRING ................................................................................................................................. 25
q STANDARD CIRCUIT DIAGRAM ................................................................................................................... 2-1
q PARTS LIST ..................................................................................................................................................... 37
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
TV/DVD COMBO
AV-20FD24
AV-20FD24
No. 52133
2003/06

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Summary of Contents for JVC AV-20FD24

  • Page 1: Table Of Contents

    AV-20FD24 SERVICE MANUAL TV/DVD COMBO AV-20FD24 POWER TV CATV PLAY MODE DISPLAY SLEEP AUDIO TIMER AUDIO TITLE SUBTITLE JUMP ANGLE C.C. RETURN MARKER ZOOM REPEATA-B RETURN – SLOW CANCEL LIGHT SELECT MUTING /ENTER INPUT – – TV MENU DVD SETUP...

  • Page 2: Specifications

    AV-20FD24 SPECIFICATIONS TELEVISION Picture Tube: 20” (measured diagonally) Color System: NTSC TV RF System: US System M Tuner Type: Quartz PLL Frequency Synthesized Receiving Channels: 2-13 14-69 CATV 14-36 (A)-(W) 37-59 (AA)-(WW) 60-85 (AAA)-(ZZZ) 86-94 (86)-(94) 95-99 (A-5)-(A-1) 100-125 (100)-(125)

  • Page 3: Safety Precautions

    AV-20FD24 SAFETY PRECAUTIONS CAUTION THIS DIGITAL VIDEO PLAYER EMPLOYS A LASER SYSTEM. TO ENSURE PROPER USE OF THIS PRODUCT, PLEASE READ THIS SERVICE MANUAL CAREFULLY AND RETAIN FOR FUTURE REFERENCE. SHOULD THE UNIT REQUIRE MAINTENANCE, CONTACT AN AUTHORIZED SERVICE LOCATION-SEE SERVICE PROCEDURE.
  • Page 4 AV-20FD24 IMPORTANT SERVICE SAFETY INFORMATION The picture tube used in this receiver employs integral implosion Operating the receiver outside of its cabinet or with its back protection. Replace with a tube of the same type number for removed involves a shock hazard. Work on these models should continued safety.
  • Page 5 AV-20FD24 IMPORTANT SAFEGUARDS 1. READ INSTRUCTIONS All the safety and operating instructions should be read before the unit is operated. 2. RETAIN INSTRUCTIONS The safety and operating instructions should be retained for future reference. 3. HEED WARNINGS All warnings on the unit and in the operating instructions should be adhered to.
  • Page 6 AV-20FD24 19. DAMAGE REQUIRING SERVICE Unplug this unit from the wall outlet and refer servicing to qualified service personnel under the following conditions: a. When the power-supply cord or plug is damaged. b. If liquid has been spilled, or objects have fallen into the unit.

  • Page 7: Specific Service Instructions

    AV-20FD24 SPECIFIC SERVICE INSTRUCTIONS DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF MECHANICAL PARTS 1-3: AV PCB/DVD BLOCK (Refer to Fig. 1-3) 1. Remove the 2 screws 1. AND P.C. BOARDS 2. Disconnect the following connectors: 1-1: BACK CABINET (Refer to Fig. 1-1) (CP104, CP301, CP302, CP401 and CP3800). 3. Remove the AV PCB/DVD Block in the direction of arrow. 1. Remove the 7 screws 1.
  • Page 8 AV-20FD24 1-5: DVD PCB/DVD DECK (Refer to Fig. 1-5) 1. Make the short circuit on the position as shown Fig. 1-5 using a soldering. If you remove the DVD Deck with no soldering, the Laser may be damaged. 2. Unlock the 2 supports 1. 3. Remove the Front Tray Plate in the direction of arrow (A).
  • Page 9 AV-20FD24 2. REMOVAL OF DVD DECK PARTS Main Chassis Ass’y NOTE 1. Do not disassemble the DVD DECK PARTS except listedparts Rack Loading here. Minute adjustments are needed if the disassemble is done. If the repair is needed except listed parts, replace the DVD MECHA ASS’Y.
  • Page 10 AV-20FD24 NOTE Main Chassis Ass’y 1. When installing the Clamper Magnet, install it with the green face 2. When installing the wire of the Lever Switch, install it correctly as Fig. 2-4-B. 3. When installing the Lever Switch, install it correctly as Fig. 2-4-C.
  • Page 11 AV-20FD24 NOTE 2-9: GEAR (Refer to Fig. 2-9-A) 1. After the assembly of the Rack Feed, check if the Rack Feed 1/2 1. Unlock the support 1. is moving smoothly. (Refer to Fig. 2-7-B) 2. Remove the Middle Gear 1/2/3, Idler Gear and Feed Gear. 2. In case of the Rack Feed AssÅfy installation, install correctly as Fig.
  • Page 12 AV-20FD24 NOTE 1. In case of the Idler Arm installation, install as the circled section of Fig. 2-10-B. 2. In case of the Idler Arm Spring installation, install as the circled section of Fig. 2-10-C. 3. In case of the Chassis Spring installation, install as the circled section of Fig.
  • Page 13 AV-20FD24 3. 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 voltage Take care not to damage the Rubber Cap.
  • Page 14 AV-20FD24 4. REMOVAL AND INSTALLATION OF FLAT 3. When IC starts moving back and forth easily after desoldering completely, pickup the corner of the IC usinga tweezers and PACKAGE IC remove the IC by moving with the IC desoldering machine. (Refer to Fig. 4-3.) REMOVAL NOTE 1. Put the Masking Tape (cotton tape) around the Flat Package IC Some ICs on the PCB are affixed with glue, so be careful not to protect other parts from any damage.
  • Page 15 AV-20FD24 INSTALLATION 4. When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thintip Soldering Iron. 1. Take care of the polarity of new IC and then install the new IC (Refer to Fig. 4-8.) fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily.
  • Page 16 AV-20FD24 SERVICE MODE LIST This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. To enter to the SERVICE MODE function, press and hold both buttons simultaneously on the main unit and on the remote control for more than a standard time (second).
  • Page 17 AV-20FD24 PARENTAL CONTROL - RATING LEVEL 4 DIGIT PASSWORD CANCELLATION If the stored 4 digit password in the Rating Level menu needs to be cancelled, please follow the steps below. 1. Turn Unit ON and set the DVD mode. 2. Check that the “No disk” is displayed on the screen.
  • Page 18 AV-20FD24 SERVICING FIXTURES AND TOOLS X-JG176 Up-Date Disc RE-WRITE FOR DVD FIRMWARE 1. Turn on the power, and set the DVD mode. 2. Confirm that the “No Disc” will be appeared on the screen. 3. Open the DVD tray. 4. Press both VOL. DOWN button on the set and Channel button (5) on the remote control for more than 1 second.

  • Page 19: Service Adjustments

    AV-20FD24 SERVICE ADJUSTMENTS ELECTRICAL ADJUSTMENTS 1. BEFORE MAKING ELECTRICAL NO. FUNCTION NO. FUNCTION ADJUSTMENTS OSD H CONT. AV(MIN) OSD CONTRAST COL. AV(CENT.) CUT OFF COL. AV(MAX) Read and perform these adjustments when repairing the circuits or H POSITION COL. AV(MIN) replacing electrical parts or PCB assemblies.
  • Page 20 AV-20FD24 2-4: WHITE BALANCE 2-8: VERTICAL LINEARITY NOTE: Adjust after performing CUT OFF adjustment. NOTE: Adjust after performing adjustments in section 2-7. After the adjustment of Vertical Linearity, reconfirm the 1. Place the set with Aging Test for more than 15 minutes. Vertical Position and Vertical Size adjustments.
  • Page 21 AV-20FD24 2-11: OSD HORIZONTAL 2-13: TINT CENTER 1. Activate the adjustment mode display of Fig. 1-1. 1. Receive the color bar pattern. (RF Input) 2. Press the VOL. UP/DOWN button on the remote control until the 2. Using the remote control, set the brightness, contrast, color and difference of A and B becomes minimum.
  • Page 22 AV-20FD24 2-14: COLOR CENTER 2-15: CONTRAST MAX 1. Activate the adjustment mode display of Fig. 1-1 and press the 1. Receive the color bar pattern. (RF Input) channel button (22) on the remote control to select "CNTX". 2. Using the remote control, set the brightness, contrast, color and tint to normal position.
  • Page 23 AV-20FD24 3. PURITY AND CONVERGENCE 3-3: STATIC CONVERGENCE ADJUSTMENTS NOTE Adjust after performing adjustments in section 3-2. NOTE 1. Receive the crosshatch pattern from the color bar generator. 1. Turn the unit on and let it warm up for at least 30 minutes before 2.
  • Page 24 AV-20FD24 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) CRT PCB TP022 TP024 J801 CP802B CD801 CD802 VR3800 J4201 J4203 FB401 CP803A CD3800 CP401 AC IN CP3800 VR402 CP802A CP8002 SPEAKER CD302 CP302 CD301 SPEAKER CP8001 CD751 CP751 AV PCB OPERATION PCB DVD DECK CP8502 CP2001 CD8505...

  • Page 25: Guide For Repairing

    AV-20FD24 GUIDE FOR REPAIRING IC DESCRIPTION AV PCB OEC6073A (IC101) Symbol Logic Function Negative power supply (Ground) TV/DVD Output TV/DVD picture signal changing output Output terminal for protect from high-voltage remaining PROTECT Output TV MUTE Output Volume muting output DVD POWER Output DVD power control output...

  • Page 26: Troubleshooting Guide

    AV-20FD24 TROUBLESHOOTING GUIDE (DVD SECTION) NO OPEN/CLOSE Check display DVD OSD. Check connection CP2301. Connection try again CP2301. Check the circuit around Change IC2001. IC2001. Change DVD LOADER. No. 52133...
  • Page 27 AV-20FD24 DVD NO PICTURE Check connection CP8502. Connection try again CP8502. Check input signal at pins Check IC601 and IC4202. 1, 3 and 5 of CP8502. Check oscillation of X4001. Change X4001. Change IC4003. Change IC4002. Change IC2001. No. 52133...
  • Page 28 AV-20FD24 DVD, CD NO PLAY ("BLUE BACK LOGO" SHOW ON SCREEN.) After reading,check When play, check the Change DVD DECK. "INCORRECT DISC" DECK MOTOR moving. display. Change DVD DECK. Check connection CD2301. Connection try again CD2301. Check connection CP2001. Connection try again CP2001.
  • Page 29 AV-20FD24 INSTABILITY DVD MODE Check connection CD8502. Connection try again CD8502. Check DVD DECK Change DVD DECK. connection bend or short ? Check connection Connection try again CD2301, CD2001. CD2301, CD2001. Change DVD DECK. No. 52133...
  • Page 30 AV-20FD24 (TV SECTION) POWER DOES NOT TURN ON (1) When turning on the Check AT5V line and Is the voltage at pin 28 of power switch, does the peripheral circuit. IC101 of 5.0V? LED light ? Check IC101 and peripheral circuit.
  • Page 31 AV-20FD24 POWER DOES NOT TURN ON 2 F3800 OK ? Change F3801. Is the voltage at Check R3817 and D3808, D3809, C3815 DC175V ? D3815, D3816 peripheral circuit. Check Q3800, IC3800 and Is the check feed back peripheral circuit. switching circuit ok? Check Q3803, Q3802 and peripheral circuit.
  • Page 32 AV-20FD24 GOOD PICTURE BUT NO SOUND Is CD301 and CD302 Insert CD301 and CD302. inserted? Check Sound+B line and Is the voltage at pin 10 peripheral circuit. of IC351 DC 21.5V ? Check P.CON+12V line and Is the voltage at pin 11 peripheral circuit.
  • Page 33 AV-20FD24 NO PICTURE Are the Brightness and Adjust Brightness and Contrast. Contrast set to NORMAL? Is the voltage at pin 8 Check P. CON + 5V line. of IC1501 DC 5V ? Is there a waveform at Check IC4202 and peripheral circuit.
  • Page 34 AV-20FD24 NO COLOR Is the color set to normal ? Adjust the color. Is the color signal received ? Receive the color signal. Is the wavefrom at pin 35 Check the peripheral circuit of X601. of IC601 normal ? Check peripheral circuit of IC601.
  • Page 35 AV-20FD24 ONLY A LINE APPEARS Is the signal at pin 19 of Check the peripheral circuit of IC601. IC601 normal ? Is there a waveform at Check IIC BUS line control IC. IIC BUS line normal? Is the signal at pin 5 Check IC401 and VCC Check FB401 and peripheral circuit.
  • Page 36 AV-20FD24 SERVICE NOTE : No. 52133...

  • Page 37: Parts List

    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. 52133) Printed in Japan 200306WPC...