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JVC AV-N29702/S Service Manual
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JVC AV-N29702/S Service Manual

JVC AV-N29702/S Service Manual

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SERVICE MANUAL
CONTENTS
SPECIFICATIONS ....................................................................................................................................2
SAFETY PRECAUTIONS ........................................................................................................................3
FEATURES ..............................................................................................................................................4
FUNCTIONS .............................................................................................................................................5
SPECIFIC SERVICE INSTRUCTIONS ....................................................................................................6
SERVICE ADJUSTMENTS ....................................................................................................................11
¤
STANDARD CIRCUIT DIAGRAM (APPENDIX) .................................................................................. 2-1
PARTS LIST ...........................................................................................................................................29
COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.
COLOR TELEVISION
AV-N29702
TV
BASIC CHASSIS
/S
AV-N29702
AC
No. 51885
Dec. 2001

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Summary of Contents for JVC AV-N29702/S

  • Page 1: Table Of Contents

    AV-N29702 SERVICE MANUAL COLOR TELEVISION BASIC CHASSIS AV-N29702 CONTENTS SPECIFICATIONS ............................2 SAFETY PRECAUTIONS ........................3 FEATURES ..............................4 FUNCTIONS .............................5 SPECIFIC SERVICE INSTRUCTIONS ....................6 SERVICE ADJUSTMENTS ........................11 ¤ STANDARD CIRCUIT DIAGRAM (APPENDIX) .................. 2-1 PARTS LIST ............................29 No. 51885 COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD. Dec.

  • Page 2: Specifications

    AV-N29702 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-N29702 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-N29702 FEATURES • • Audio Video input terminal. (S-input ×2, V-input ×3) Full-flat CRT (cathode ray tube) reproduces fine textured picture in • every detail. Variable/Fix audio output terminal. • • C bus control utilizes single chip ICs. Closed-caption broadcasts can be viewed. •...

  • Page 5: Functions

    AV-N29702 FUNCTIONS FRONT PANEL ON TIMER POWER REMOTE CONTROL UNIT FRONT PANEL DOOR OPENED (RM-C303G-1A) TV CATV POWER INPUT VIDEO STATUS REAR PANEL DISPLAY SLEEP TIMER 100+ RETURN+ HYPER SURROUND LIGHT RM-C301G MUTING V CHIP EXIT PIP OFF MENU VCR/DVD VCR CHANNEL POWER TV/VCR...

  • Page 6: Specific Service Instructions

    AV-N29702 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-N29702 SPEAKER FRONT CABINET (x4) CRT SOCKET PWB FRONT PWB CLAW (x4) DAF PWB CLAW PWB STOPPER CHASSIS POWER SW PWB CLAW MAIN PWB STOPPER LF PWB REAR COVER (x4) STOPPER (x12) Fig.1 No. 51885...
  • Page 8 AV-N29702 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. 2.
  • Page 9 AV-N29702 TABLE 1 (System Constant setting) Setting item Setting content Setting value AV-27F802 AV-32F802 AV-36F802 AV-27F702 AV-32F702 AV-36D502 AV-32D502 AV-27D502 AV-36F702 MODEL AV-N29702 AV-32D302 AV-36D302 AV-32D202 AV-36D202 AV-36230 AV-32230 AV-36260 AV-32260 AV-27260 PURITY V-CHIP CAN V-CHIP TABLE 2 (User setting value) Setting item Setting value 1.
  • Page 10 AV-N29702 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. SOLDERING IRON 1.

  • Page 11: Service Adjustments

    AV-N29702 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-N29702 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 CN007 FRONT IC702...
  • Page 13 AV-N29702 BASIC OPERATION OF SERVICE MENU 1. TOOL OF SERVICE MENU OPERATION Operate the SERVICE MENU with the REMOTE CONTROL UNIT. 2. SERVICE MENU ITEMS In general, basic setting (adjustments) items or verifications are performed in the SERVICE MENU. • PICTURE .......
  • Page 14 AV-N29702 SERVICE MENU (MAIN MENU) SCREEN PICTURE MODE SERVICE MENU PICTURE SOUND THEATER OTHERS LOW LIGHT HIGH LIGHT RF AFC VCO(CW) I2C BUS CTRL SELECT SELECT 1. BRIGHT 99999999 OPERATE BY EXIT BY EXIT BY STATUS SOUND MODE OTHERS MODE 1.
  • Page 15 AV-N29702 (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). 3) EXIT key Returns to the previous screen.
  • Page 16 AV-N29702 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. 2.
  • Page 17 AV-N29702 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 000 — 003 CMP CD MAT 000 —...
  • Page 18 AV-N29702 Setting (Adjustment) item Variable range Initial setting value H EHT 000 — 007 BTM PIN 000 — 031 V BLK LOW 000 — 003 V BLK UP 000 — 003 CAPTION IN 000 / 001 H BLK 000 / 001 SCREEN 000 / 001 ACB SW...
  • Page 19 AV-N29702 • SOUND MODE Setting (Adjustment) item Variable range Initial setting value NOISE DET. 000 / 001 IN LEVEL 000 — 063 FH MONITOR 000 / 001 STEREO VCO 000 — 063 PILOT CAN. 000 / 001 FILTER 000 — 063 LOW SEP.
  • Page 20 AV-N29702 • LOW LIGHT MODE Setting (Adjustment) item Variable range Initial setting value R CUTOFF 0 — 255 G CUTOFF 0 — 255 B CUTOFF 0 — 255 • HIGH LIGHT MODE Setting (Adjustment) item Variable range Initial setting value R DRIVE 0 —...
  • Page 21 AV-N29702 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 SUPPLY Q511 3.
  • Page 22 AV-N29702 ADJUSTMENT OF WHITE BALANCE Measuring Item Test point Adjustment part Description instrument WHITE Signal No.1 BRIGHT Note : BALANCE generator Set VIDEO STATUS to “STANDARD”. (Low Light) R CUTOFF adjustment Remote G CUTOFF 1. Receive a black-and-white signal.(Color off) control unit B CUTOFF 2.
  • Page 23 AV-N29702 ADJUSTMENT OF BRIGHT Measuring Item Test point Adjustment part Description instrument SUB BRIGHT Remote No.1 BRIGHT Notes: • Proceed to the following this adjustment after having completed the adjustment control unit adjustments of LOW LIGHT WHITE BALANCE and HIGH LIGHT WHITE BALANCE.
  • Page 24 AV-N29702 Measuring Item Test point Adjustment part Description instrument Signal No.66 V SIZE Note: V-SIZE and V-LINEARITY generator No.65 V LIN Proceed to the following this adjustment after having completed the adjustment adjustments of SUB BRIGHT and SUB CONTRAST. Remote control unit 1.
  • Page 25 AV-N29702 ADJUSTMENT OF CHROMA Measuring Item Test point Adjustment part Description instrument SUB COLOR Signal TP-B No.3 COLOR Notes: • Proceed to the following this adjustment after having completed the adjustment generator TP-E1( [CRT SOCKET adjustment of CONTRAST. Oscilloscope PWB] •...
  • Page 26 AV-N29702 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 Remote LEVEL control unit 2. Verify that the No.2 IN LEVEL is set at its initial setting value. check Signal 2 pin AUDIO R...
  • Page 27 AV-N29702 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 28 AV-N29702 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. 2.

  • Page 29: Parts List

    JVC SERVICE & ENGINEERING COMPANY OF AMERICA DIVISION OF JVC AMERICAS CORP. Head office : 1700 Valley Road, Wayne, New Jersey 07470 (973)317-5000 East Coast : 10 New Maple Avenue, Pine Brook, New Jersey 07058 (973)396-1000 Midwest 705 Enterprise St. Aurora, Illinois 60504...