JVC AV-27F802 Service Manual
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JVC AV-27F802 Service Manual

JVC AV-27F802 Service Manual

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SERVICE MANUAL

CONTENTS
SPECIFICATIONS .................................................................................................................................... 2
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OPERATING INSTRUCTIONS (APPENDIX)
SAFETY PRECAUTIONS ........................................................................................................................3
FEATURES ..............................................................................................................................................4
FUNCTIONS ............................................................................................................................................. 5
SPECIFIC SERVICE INSTRUCTIONS .................................................................................................... 6
SERVICE ADJUSTMENTS .................................................................................................................... 11
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STANDARD CIRCUIT DIAGRAM (APPENDIX) .................................................................................. 2-1
PARTS LIST ........................................................................................................................................... 33
COPYRIGHT © 2000 VICTOR COMPANY OF JAPAN, LTD.
COLOR TELEVISION
AV-27F802
TV
AV-27F802
BASIC CHASSIS
AC
No. 51757
Sep. 2000

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Summary of Contents for JVC AV-27F802

  • Page 1: Table Of Contents

    AV-27F802 SERVICE MANUAL COLOR TELEVISION BASIC CHASSIS AV-27F802 CONTENTS SPECIFICATIONS ............................ 2 ¤ OPERATING INSTRUCTIONS (APPENDIX) SAFETY PRECAUTIONS ........................3 FEATURES ..............................4 FUNCTIONS ............................. 5 SPECIFIC SERVICE INSTRUCTIONS ....................6 SERVICE ADJUSTMENTS ........................11 ¤ STANDARD CIRCUIT DIAGRAM (APPENDIX) .................. 2-1 PARTS LIST ............................

  • Page 2: Specifications

    AV-27F802 SPECIFICATIONS Items Contents Dimensions (W × H × D) 29-7/8” × 23-3/8” × 19-3/4” / 75.8cm × 59.3cm × 50.0cm ················································································································································································································ Mass 101.2 lbs / 46 kg ················································································································································································································ TV RF System CCIR(M) ················································································································································································································ Color Sound System NTSC, BTSC System (Multi Channel Sound) ················································································································································································································...

  • Page 3: Safety Precautions

    AV-27F802 SAFETY PRECAUTIONS 1. The design of this product contains special hardware, many circuits 10. Isolation Check and components specially for safety purposes. For continued pro- (Safety for Electrical Shock Hazard) tection, no changes should be made to the original design unless After re-assembling the product, always perform an isolation check authorized in writing by the manufacturer.

  • Page 4: Features

    AV-27F802 FEATURES • • Full-flat CRT (cathode ray tube) reproduces fine textured picture in 3 LINE Digital Y/C Separation circuit improved picture quality. • every detail. Component input terminal for talking best advantage of Component • C bus control utilizes single chip ICs.

  • Page 5: Functions

    AV-27F802 FUNCTIONS FRONT PANEL REMOTE CONTROL UNIT FRONT PANEL DOOR OPENED (RM-C301G-1A) REAR PANEL No. 51757...

  • Page 6: Specific Service Instructions

    AV-27F802 SPECIFIC SERVICE INSTRUCTIONS DISASSEMBLY PROCEDURE REMOVING THE REAR COVER REMOVING THE DAF PW BOARD • After removing the rear cover and chassis. 1. Unplug the power supply cord. 1. Lift the right side of the DAF PWB while pressing the PWB stopper 2.
  • Page 7 AV-27F802 FRONT CABINET SPEAKER CRT SOCKET PWB FRONT PWB CLAW (x6) DAF PWB CLAW PWB STOPPER CHASSIS POWER SW PWB CLAW MAIN PWB STOPPER LF PWB REAR COVER (x6) STOPPER (x12) Fig.1 No. 51757...
  • Page 8 AV-27F802 MEMORY IC REPLACEMENT 1. Memory IC This model use a memory IC. This memory IC stores data for proper operation of the video and deflection circuits. When replacing, be sure to use an IC containing this (initial value) data.
  • Page 9 AV-27F802 TABLE 1 (System Constant setting) Setting item Setting content Setting value AV-27F802 AV-32F802 AV-36F802 AV-27F702 AV-32D602 AV-27D602 AV-36F702 AV-32F702 MODEL AV-27F802 AV-36D602 AV-27D502 AV-32D502 AV-36D502 AV-36D202 AV-32D202 AV-36D302 AV-32D302 TM CORR. V-CHIP CAN V-CHIP TABLE 2 (User setting value)

  • Page 10: Replacement Of Chip Component

    AV-27F802 REPLACEMENT OF CHIP COMPONENT 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.

  • Page 11: Service Adjustments

    AV-27F802 SERVICE ADJUSTMENTS ADJUSTMENT PREPARATION: 1. You can make the necessary adjustments for this unit with either the remote control unit or with the adjustment equipment and parts as given below. 2. Adjustment with the remote control unit is made on the basis of the initial setting values, however, the new setting values which set the screen to its optimum condition may differ from the initial settings.
  • Page 12 AV-27F802 ADJUSTMENT LOCATIONS POWER SW PWB FRONT PWB FRONT D101 S706 S704 S702 IC101 S705 S703 S702 : MENU S703 : CHANNEL– S704 : CHANNEL+ CN007 CN006 S705 : VOLUME– S701 S706 : VOLUME+ LINE FILTER MAIN PWB CN006 FRONT...
  • Page 13 RF AFC2 ........ This is used when the RF AFC2 MODE is verified. [Do not adjust] • VCO (CW) ......This is not used for AV-27F802. • I2C BUS CTRL ...... This is used when ON/OFF of the I2C BUS CTRL is set. [Fixed ON] 3.
  • Page 14 AV-27F802 SERVICE MENU (MAIN MENU) SCREEN PICTURE MODE SERVICE MENU PICTURE SOUND THEATER OTHERS 3-D Y/C LOW LIGHT HIGH LIGHT RF AFC1 RF AFC2 VCO(CW) I2C BUS CTRL SELECT SELECT 1. BRIGHT 99999999 OPERATE BY EXIT BY EXIT BY STATUS...
  • Page 15 AV-27F802 (4) Setting method SETTING ITEM 1) UP / DOWN key of the MENU Select the SETTING ITEM. 2) LEFT / RIGHT key of the MENU Setting (adjust) the SETTING VALUE of the SETTING ITEM. When the key is released the SETTING VALUE will be stored (memorized).

  • Page 16: Initial Setting Value Of Service Menu

    AV-27F802 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 set the screen in its optimum condition may differ from the initial setting.
  • Page 17 AV-27F802 Setting (Adjustment) item Variable range Initial setting value R Y GAIN 000 / 001 CMP R Y GA 000 / 001 G Y PHASE 000 / 001 CMP G Y PH 000 / 001 CD MATRIX CMP CD MAT...
  • Page 18 AV-27F802 Setting (Adjustment) item Variable range Initial setting value H EHT BTM PIN V BLK LOW V BLK UP CAPTION IN 000 / 001 H BLK 000 / 001 SCREEN 000 / 001 ACB SW 000 / 001 ACB PULSE...
  • Page 19 AV-27F802 • SOUND MODE Setting (Adjustment) item Variable range Initial setting value NOISE DET. 000 / 001 IN LEVEL FH MONITOR 000 / 001 STEREO VCO PILOT CAN. 000 / 001 FILTER LOW SEP. HI SEP. 5FH MON. 000 / 001...
  • Page 20 AV-27F802 • OTHERS MODE Setting (Adjustment) item Variable range Initial setting value OSD POS. CCD POS. EOSEL 000 / 001 MENU COLOR –030 –010 MENU PICT. –030 –010 MENU BRI. –030 –010 • PIP MODE Setting (Adjustment) item Variable range...
  • Page 21 AV-27F802 • 3-D Y/C MODE Setting (Adjustment) item Variable range Initial setting value YC 001 YC 002 YC 003 YC 004 YC 005 YC 006 YC 007 YC 008 YC 009 YC 010 YC 011 YC 012 YC 013 YC 014...
  • Page 22 AV-27F802 Setting (Adjustment) item Variable range Initial setting value YC 048 YC 049 YC 050 000 / 001 YC 051 000 / 001 YC 052 YC 053 000 / 001 YC 054 000 / 001 YC 055 000 / 001...
  • Page 23 AV-27F802 Setting (Adjustment) item Variable range Initial setting value YC 095 DBL 000 / 001 YC 096 DBL 000 / 001 YC 097 DBL 000 / 001 YC 098 DBL 000 / 001 YC 099 DBL YC 100 DBL YC 101 DBL...
  • Page 24 AV-27F802 ADJUSTMENTS B1 POWER SUPPLY Measuring Item Test point Adjustment part Description instrument Check of DC Voltmeter R507 C504 1. Receive a black-and-white signal. side (B1) 2. Connect the DC Voltmeter to R507 C504 side (B1) and Q511 heatsink B1 POWER...
  • Page 25 AV-27F802 ADJUSTMENT OF DEFLECTION CIRCUIT Measuring Item Test point Adjustment part Description instrument Signal No.68 V CENTER 1. Receive a crosshatch signal. V CENTER and generator No.78 TRAPEZ 2. Adjust the No.68 V CENTER of the PICTURE MODE to be the same TRAPEZIUM between the CRT vertical center and crosshatch vertical center.
  • Page 26 AV-27F802 Measuring Item Test point Adjustment part Description instrument Signal No.76 SIDE PIN 1. Receive a crosshatch signal. SIDE PIN and generator No.82 TOP PIN 2. Adjust such that vertical 2nd lines from left and right to be straight at CORNER PIN No.84 BTM PIN...
  • Page 27 AV-27F802 ADJUSTMENT OF VIDEO/CHROMA CIRCUIT Measuring Item Test point Adjustment part Description instrument WHITE Signal BRIGHT 1. Receive a black-and-white signal.(Color off) BALANCE generator 2. Select the [LOW LIGHT] MODE from the SERVICE MENU. (Low Light) R CUTOFF 3. Set the initial setting value of BRIGHT is 063 with the LEFT / RIGHT...
  • Page 28 AV-27F802 Measuring Item Test point Adjustment part Description instrument No.2 PICTURE 1. Receive a broadcast. 2. Select the No.2 PICTURE of the PICTURE MODE. CONTRAST 3. Set the initial setting value of the No.2 PICTURE with the LEFT / Adjustment RIGHT key of the remote control unit.
  • Page 29 AV-27F802 ADJUSTMENT OF MTS CIRCUIT Measuring Item Test point Adjustment part Description instrument No.2 IN LEVEL 1. Select the No.2 IN LEVEL of the SOUND MODE. MTS INPUT 2. Verify that the No.2 IN LEVEL is set at its initial setting value.
  • Page 30 AV-27F802 HOW TO CHECK THE HIGH VOLTAGE HOLD DOWN CIRCUIT 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. 2. CHECKING OF THE HIGH VOLTAGE HOLD DOWN CIRCUIT (1) Turn the POWER SW ON.
  • Page 31 AV-27F802 SELF CHECK FUNCTIONS 1. Outline This model has self check functions given below. When a malfunction has been detected, the POWER is turned off and the LED flashes to inform of the failure . The malfunction is detected by the signal input state of the control line connected to the microcomputer.
  • Page 32 AV-27F802 No. 51757...

  • Page 33: Parts List

    JVC SERVICE & ENGINEERING COMPANY OF AMERICA DIVISION OF JVC AMERICAS CORP. Head office : 1700 Valley Road, Wayne, New Jersey 07470 (973)315-5000 East Coast : 10 New Maple Avenue, Pine Brook, New Jersey 07058 (973)396-1000 Midwest 705 Enterprise St. Aurora, Illinois 60504...

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