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JVC AV-28KH1BUF Service Manual

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SERVICE MANUAL
9
2003
52139
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED
COLOUR TELEVISION
AV-28KH1BUF,
AV-28KH1SUF

TABLE OF CONTENTS

No.52139
2003/9

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  Summary of Contents for JVC AV-28KH1BUF

  • Page 1: Table Of Contents

    COLOUR TELEVISION 52139 2003 AV-28KH1BUF, AV-28KH1SUF TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 EXT-3 (Video / Audio) Headphone Jack (Stereo mini jack O3.5mm × 1) Right Side VE-30021286 (RM-C1512B), (AA/R06 dry battery × 2) : AV-28KH1BUF Remote Control Unit VE-30021287 (RM-C1512S), (AA/R06 dry battery × 2) : AV-28KH1SUF Design & specifications are subject to change without notice.
  • Page 3: Precaution

    SECTION 1 PRECAUTION SAFETY PRECAUTIONS (1) The design of this product contains special hardware, (8) When service is required, observe the original lead dress. many circuits and components specially for safety Extra precaution should be given to assure correct lead purposes.
  • Page 4: Specific Service Instructions

    SECTION 2 SPECIFIC SERVICE INSTRUCTIONS 21-pin Euro connector (SCART) : EXT-1 / EXT-2 / EXT-3 Pin No. Signal Designation Matching Value EXT-1 EXT-2 AUDIO R output 500mV(rms) (Nominal), Low impedance Used Used AUDIO R input 500mV(rms) (Nominal), High impedance Used (R1) Used (R2) AUDIO L output 500mV(rms) (Nominal), Low impedance Used...
  • Page 5 • It is possible to connect headphone. itself automatically to stand-by mode. • Direct channel access. • WSS (Wide Screen Signaling) • APS (Automatic Programming System). • NTSC Playback. MAIN DIFFERENCE LIST Part Name AV-28KH1BUF AV-28KH1SUF FRONT CABINET VE-201279210 VE-20111863 BACK COVER VE-20121494 VE-20120043...
  • Page 6: Disassembly

    SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDULE 3.1.1 REMOVING THE REAR COVER 3.1.10 CHECKING THE PW BOARD (1) Unplug the power cord. • To check the back side of the PW Board. (2) Remove the 8 screws [A] as shown in the Fig. 1. (1) Pull out the PW Board.
  • Page 7 REAR COVER FEATURE BOX MAIN PWB BASE BACK DOOR CRT SOCKET PWB SIDE CONTROL TWEETER SPEAKER LED PWB POWER SWITCH PWB Fig.1 (No.52139)1-7...
  • Page 8 REPLACEMENT OF CHIP COMPONENT 3.2.1 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. 3.2.2 SOLDERING IRON (1) Use a high insulation soldering iron with a thin pointed end of it.
  • Page 9 SETTING OF THE LAST MEMORY FOR SHIPMENT 3.3.1 USER SETTING VALUES Setting Item Setting Value Setting Item Setting Value SOUND MENU FEATURE MENU BALANCE CENTER SLEEP TIMER BASS CENTER CHILD LOCK TREBLE CENTER HYPER SOUND PICTURE MENU INSTALL BRIGHTNESS These adjust are automatically LANGUAGE ENGLISH restored when APS bit in Service...
  • Page 10: Adjustment

    SECTION 4 ADJUSTMENT ADJUSTMENT PREPARATION Setting Item Setting value (1) You can make the necessary adjustments for this unit with BRIGHTNESS CENTER either the Remote Control Unit or with the adjustment tools CONTRAST and parts as given below. (2) Adjustment with the Remote Control Unit is made on the COLOUR basis of the initial setting values, however, the new setting SHARPNESS...
  • Page 11 BASIC OPERATION OF SERVICE MENU 4.5.1 HOW TO ENTER THE SERVICE MENU REMOTE CONTROL UNIT key NAME (1) Press the [INFORMATION] key and [MUTING] key simultaneously, and the SERVICE MENU screen (Fig.1) will be displayed. SERVICE MENU MUTE key PRODUCTION i >STORE MENU>EXIT (FULL MODE)
  • Page 12: Do Not Adjust

    4.5.4 COLOUR KEY FUNCTION AND SCREEN SIDPLAY Colour key function in the SERVICE MENU colour key press time select menu onece colour key location twice BLUE onece VIDEO YELLOW GREEN twice FACTRY SETTINGS GREEN onece YELLOW twice PICTURE MODE SETTINGS onece SERVICE (SERVICE MENU 2) BLUE...
  • Page 13 ADJUSTMENT PROCEDURE 4.6.1 FOCUS / SCREEN ADJUSTMENT Measuring Item Test point Adjustment part Description instrument FOCUS Signal FOCUS VR (1) Receive a cross-hatch signal. adjustment generator [On the FBT] (2) Adjust FOCUS VR on the FBT as thin as possible. Remote control unit FOCUS VR...
  • Page 14 4.6.3 DEFLECTION CIRCUIT ADJUSTMENT Measuring Item Test point Adjustment part Description instrument VERTICAL Signal V-SHIFT (1) Receive a circle pattern signal. SHIFT generator (2) Enter the SERVICE MENU. adjustment (3) Press the [RED] key, then enter the H/V adjustment Remote group.
  • Page 15 Measuring Item Test point Adjustment part Description instrument VERTICAL Signal S-COR (1) Receive a cross-hatch signal. S-CORRECTION generator (2) Enter the SERVICE MENU. & LINEARITY LINRT (3) Press the [RED] key, then enter the H/V adjustment adjustment Remote group. control unit (4) Select S-COR.
  • Page 16 Measuring Item Test point Adjustment part Description instrument HORIZONTAL Signal H-SIZE (1) Receive a cross-hatch signal. SIZE generator (2) Enter the SERVICE MENU. adjustment (3) Press the [RED] key, then enter the H/V adjustment Remote group. control unit (4) Select H-SIZE. (5) Adjust H-SIZE until vertical lines on both the left and Very Very...
  • Page 17 Measuring Item Test point Adjustment part Description instrument TRAPEZIUM Signal TRAPEZ (1) Receive a cross-hatch signal. adjustment generator (2) Enter the SERVICE MENU. (3) Press the [RED] key, then enter the H/V adjustment Remote group. control unit (4) Select TRAPEZ. (5) Adjust TRAPEZ till vertical lines, especially lines at the sides of the picture frame become parallel to the Parallel...
  • Page 18 Measuring Item Test point Adjustment part Description instrument CORNER Signal U.COR (1) Receive a cross-hatch signal. adjustment generator (2) Enter the SERVICE MENU. L.COR (3) Press the [RED] key, then enter the H/V adjustment Remote group. control unit (4) Select U.COR. (5) Adjust U.COR till vertical lines at the upper corners Straight Straight...
  • Page 19 Measuring Item Test point Adjustment part Description instrument NTSC Signal NTSCHS (1) Receive a NTSC cross-hatch signal. HORIZONTAL generator (2) Enter the SERVICE MENU. SIZE (3) Press the [RED] key, then enter the H/V adjustment adjustment Remote group. control unit (4) Select NTSCHS.
  • Page 20 4.6.4 VIDEO CIRCUIT Measuring Item Test point Adjustment part Description instrument WHITE Signal (1) Receive a black & white signal. BALANCE generator (2) Enter the SERVICE MENU. adjustment (3) Press the [GREEN] key, then enter the VIDEO Remote adjustment group. control unit (4) Select WdR, WdG and WdB respectively.
  • Page 21: Troubleshooting

    SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING. (No.52139)1-21...
  • Page 22 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY VIDEO DISPLAY CATEGORY 12, 3-chome, Moriya-cho, kanagawa-ku, Yokohama, kanagawa-prefecture, 221-8528, Japan (No.52139) Printed in Japan...

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