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JVC AV-14F704 Service Manual
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JVC AV-14F704 Service Manual

JVC AV-14F704 Service Manual

Color television
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CONTENTS
q SPECIFICATIONS .............................................................................................................................................. 2
q OPERATING INSTRUCTIONS (APPENDIX)
q SAFETY PRECAUTIONS .................................................................................................................................. 3
q SPECIFIC SERVICE INSTRUCTIONS .............................................................................................................. 4
q SERVICE ADJUSTMENTS ................................................................................................................................ 8
q GUIDE FOR REPAIRING ................................................................................................................................. 13
q STANDARD CIRCUIT DIAGRAM ................................................................................................................... 2-1
q PARTS LIST ..................................................................................................................................................... 19
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
COLOR TELEVISION
AV-14F704
AV-14F704
No. 52130
2003/05

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Summary of Contents for JVC AV-14F704

  • Page 1: Table Of Contents

    AV-14F704 SERVICE MANUAL COLOR TELEVISION AV-14F704 CONTENTS q SPECIFICATIONS .............................. 2 q OPERATING INSTRUCTIONS (APPENDIX) q SAFETY PRECAUTIONS ..........................3 q SPECIFIC SERVICE INSTRUCTIONS ......................4 q SERVICE ADJUSTMENTS ..........................8 q GUIDE FOR REPAIRING ..........................13 q STANDARD CIRCUIT DIAGRAM ........................2-1 q PARTS LIST ..............................

  • Page 2: Specifications

    AV-14F704 SPECIFICATIONS TELEVISION Picture Tube: 14” (measured diagonally) Color System: NTSC TV RF System: US System 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)

  • Page 3: Safety Precautions

    AV-14F704 SAFETY PRECAUTIONS SERVICING NOTICES ON CHECKING 1. KEEP THE NOTICES 6. AVOID AN X-RAY As for the places which need special attentions, they are Safety is secured against an X-ray by considering about the indicated with the labels or seals on the cabinet, chassis and cathode-ray tube and the high voltage peripheral circuit, etc.

  • Page 4: Specific Service Instructions

    AV-14F704 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 voltage Take care not to damage the Rubber Cap.
  • Page 5 AV-14F704 2. REMOVAL AND INSTALLATION OF 3. When IC starts moving back and forth easily after desoldering completely, pickup the corner of the IC using a tweezers and FLAT PACKAGE IC remove the IC by moving with the IC desoldering machine.
  • Page 6 AV-14F704 INSTALLATION 4. When bridge-soldering between terminals and/or the soldering 1. Take care of the polarity of new IC and then install the new IC amount are not enough, resolder using a Thintip Soldering Iron. fitting on the printed circuit pattern. Then solder each lead on the (Refer to Fig.

  • Page 7: Service Mode List

    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. VOL. (-) MIN (The “N”...

  • Page 8: Service Adjustments

    AV-14F704 SERVICE ADJUSTMENTS ELECTRICAL ADJUSTMENTS 2. BASIC ADJUSTMENTS 1. ADJUSTMENT PROCEDURE Read and perform these adjustments when repairing the circuits or 2-1: CONSTANT VOLTAGE replacing electrical parts or PCB assemblies. 1. Place the set with Aging Test for more than 5 minutes.
  • Page 9 AV-14F704 2-7: VERTICAL SIZE 2-11: SEPARATION 1, 2 1. Receive the monoscope pattern. Please do the method (1) or method (2) adjustment. 2. Using the remote control, set the brightness and contrast to Method (1) normal position. 1. Set the multi-sound signal generator for each different Lch and 3.
  • Page 10 AV-14F704 2-13: TINT/COLOR CENT 2-14: CONTRAST MAX MANUAL 1. Receive the color bar pattern. (RF Input) 1. Activate the adjustment mode display of Fig. 1-1 and press the 2. Connect the oscilloscope to TP024. channel button (18) on the remote control to select “CONT.

  • Page 11: Purity And Convergence

    AV-14F704 3-3: STATIC CONVERGENCE 3. PURITY AND CONVERGENCE NOTE ADJUSTMENTS Adjust after performing adjustments in section 3-2. NOTE 1. Receive the crosshatch pattern from the color bar generator. 2. Combine red and blue of the 3 color crosshatch pattern on the 1.
  • Page 12 AV-14F704 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) CRT PCB CP806 TP024 R805 TP023 R803 J801 CP803 CP802B CP801B CD801 CD802 CP801A CP101 FB401 CP401 VR401 TP003 W003 VR502 SPEAKER CP802A CP502 L503 AC IN CP1001 J706 J705 CD501...

  • Page 13: Guide For Repairing

    AV-14F704 GUIDE FOR REPAIRING IC DESCRIPTION MAIN PCB OEC7093A (IC101) Pin name Symbol Logic Function Option P11/SCL1 AUDIO MUTE Audio MUTE Output. C-MOS P00/PWM0 EXT MUTE Audio MUTE Output for external Output. Nch-OD P01/PWM1 VOLUME Volume PWM output. Nch-OD P02/PWM2 BBE-H BBE Control Output.

  • Page 14: Troubleshooting Guide

    AV-14F704 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. T501 Is the voltage at the point (B) Check R501 and R541.
  • Page 15 AV-14F704 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 16 AV-14F704 NO COLOR Are the waveforms at pins 3, Defect of CRT or contact defects 7 and 9 of J801 normal ? of J801. Are the waveforms at pins 3, Check the output circuit and 4 and 5 of CP802 normal ? associated circuit.
  • Page 17 AV-14F704 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 1 of IC401 normal ? of IC401 25V? peripheral circuit.
  • Page 18 AV-14F704 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 16 and 19 of IC303? check peripheral circuit. Is the AUDIO signal input Check IC302 and peripheral circuit.

  • Page 19: 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. 52130) Printed in Japan 200305WPC...

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