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JVC AV-20NX3 Service Manual
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JVC AV-20NX3 Service Manual

JVC AV-20NX3 Service Manual

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SERVICE MANUAL
MUTING
POWER
SYSTEM
CINEMA
COLOUR SOUND
SURROUND
ECO
DISPLAY
SENSOR
MENU
TV/VIDEO
1
2
3
OFF
TIMER
4
5
6
PICTURE
MODE
7
8
9
CHANNEL
RETURN+
SCAN
0
-/--
CHANNEL
VOLUME
RM-C1014
TV
RM-C1014-1H
CONTENTS
SPECIFICATIONS ....................................................................................................................................2
a
OPERATING INSTRUCTIONS (APPENDIX)
SAFETY PRECAUTIONS .........................................................................................................................3
FEATURES ..............................................................................................................................................4
FUNCTIONS .............................................................................................................................................5
SPECIFIC SERVICE INSTRUCTIONS ....................................................................................................6
SERVICE ADJUSTMENTS ....................................................................................................................14
STANDARD CIRCUIT DIAGRAM (APPENDIX) .................................................................................. 2-1
PARTS LIST ...........................................................................................................................................39
COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.
COLOUR TELEVISION
AV-20NX3
AV-20NX3
BASIC CHASSIS
CH
No. 52079
Nov. 2002

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Summary of Contents for JVC AV-20NX3

  • Page 1: Table Of Contents

    AV-20NX3 SERVICE MANUAL COLOUR TELEVISION BASIC CHASSIS AV-20NX3 MUTING POWER SYSTEM CINEMA COLOUR SOUND SURROUND DISPLAY SENSOR MENU TV/VIDEO TIMER PICTURE MODE CHANNEL RETURN+ SCAN -/-- CHANNEL VOLUME RM-C1014 RM-C1014-1H CONTENTS SPECIFICATIONS ............................2 OPERATING INSTRUCTIONS (APPENDIX) SAFETY PRECAUTIONS .........................3 FEATURES ..............................4 FUNCTIONS .............................5...

  • Page 2: Specifications

    AV-20NX3 SPECIFICATIONS Items Contents Dimensions (W × H × D) 61.9cm × 45.8cm × 48.8cm Mass 19kg TV RF System B, G, I, D, K, K1, M Colour System TV Mode PAL / SECAM / NTSC3.58 / NTSC4.43 VIDEO Mode PAL / SECAM / NTSC3.58 / NTSC4.43...

  • Page 3: Safety Precautions

    AV-20NX3 SAFETY PRECAUTIONS 1. The design of this product contains special hardware, many circuits 8. When service is required, observe the original lead dress. Extra and components specially for safety purposes. For continued pro- precaution should be given to assure correct lead dress in the high tection, no changes should be made to the original design unless voltage circuit area.

  • Page 4: Features

    AV-20NX3 FEATURES s New chassis design enables use of an interactive on-screen control. s Built-in DIGITAL ECO MODE (ECONOMY, ECOLOGY). s Pure flat CRT produces fine textured picture in every detail. In accordance with the brightness in a room, the brightness and/or s Wide range voltage (110V ~ 240V) for AC power input.

  • Page 5: Functions

    AV-20NX3 FUNCTIONS MENU CHANNEL VOLUME L/MONO POWER POWER EXIT IN (VIDEO-3) FRONT PANEL MENU VOLUME POWER POWER CHANNEL L/MONO EXIT IN (VIDEO-3) REAR PANEL COMPONENT VIDEO-1 ( VIDEO-2 ) OUTPUT INPUT INPUT MONO MONO REMOTE CONTROL UNIT [RM-C1014-1H] POWER MUTING...

  • Page 6: Specific Service Instructions

    AV-20NX3 SPECIFIC SERVICE INSTRUCTIONS DISASSEMBLY PROCEDURE REMOVING THE REAR COVER 1. Unplug the power supply cord. Å ı 2. Remove the 6 screws marked and 4 screws marked as shown in Fig.1. 3. Withdraw the Rear cover toward you. [CAUTION] •...
  • Page 7 AV-20NX3 PICTURE TUBE FRONT CABINET (X4) SPEAKER MAIN PWB (CRT SOCKET PWB) MAIN PWB (X4) SPEAKER REAR COVER (X6) Fig.1 No. 52079...
  • Page 8 AV-20NX3 REMOVING THE CRT CRT CHANGE TABLE * Replacement of the CRT should be performed by 2 or more persons. • After removing the rear cover, chassis etc., 1. Putting the CRT change table on soft cloth, the CRT change table should also be covered with such soft cloth (shown in Fig.
  • Page 9 AV-20NX3 REPLACEMENT OF MEMORY IC 1. MEMORY IC (6) User setting This TV uses the following memory IC. Check the user setting values in Table 2, and if setting value is Memory IC: IC1702 on MAIN PW Board different, set the correct value.
  • Page 10 AV-20NX3 SETTING OF SYSTEM CONSTANT SET Setting value Setting item Setting content MULTI TRIPLE SINGLE VIET SYSTEM MULTI COMB TILT ERCMI ERAPU TEXT SUPER BASS E/R/C/M/I E/R/C E/R/C/M/I LANGUAGE BILINGUAL B/B SOUND TUNER COLOUR AUTO LOCK 1MHz 500KHz 250KHz 156.25KHz 31.25KHz...
  • Page 11 AV-20NX3 USER SETTING VALUES Setting item Setting value SUB POWER CHANNEL POSITION 1 POSITION CHANNEL PRESET REFER TO OPERATING INSTRUCTIONS VOLUME 15 ± 2 TV/VIDEO COMPRESS (16:9) AUTO SHUTOFF CHILD LOCK BLUE BACK VIDEO-2 SET VIDEO LANGUAGE 3D SURROUND AI VOLUME...
  • Page 12 AV-20NX3 SERVICE MENU SETTING ITEMS Service menu Setting item Service menu Setting item 1. IF 1. VCO 5. PRESET 1. PSNS 2. DELAY POINT 2. ACL Do not adjust 3. MUS 4. MAT 2. VC 1. CUTOFF(R/G) 5. FCO 2. DRIVE(R/G/B) 6.
  • Page 13 AV-20NX3 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 14: Service Adjustments

    AV-20NX3 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 15 AV-20NX3 ADJUSTMENT LOCATIONS MAIN PWB ASS'Y S783 S781 J773 J772 J771 J770 S784 S782 S780 FRONT S780 : MENU POWER SW S781 : CH– S782 : CH+ S783 : VOL– S901 CN001 S784 : VOL+ IC702 IC701 J801 J802 J803...
  • Page 16 AV-20NX3 BASIC OPERATION IN SERVICE MENU 1. TOOL OF SERVICE MENU OPERATION Operate the SERVICE MENU with the remote control unit. 2. SERVICE MENU ITEMS With the SERVICE MENU,various settings (adjustments)can be made,and they are broadly classified in the following items of settings: •...
  • Page 17 AV-20NX3 SERVICE MENU SUB MENU 1. IF SERVICE MENU 1. IF 2. VC VCO (CW) ***** 3. DEF 4. VSM PRESET TOO HIGH 5. PRESET 1. VCO ABOVE REFERENCE 6. PLUG & PLAY (ON) BELOW REFERENCE 2. DELAY POINT TOO LOW...
  • Page 18 AV-20NX3 ADJUSTMENTS B1 POWER SUPPLY Measuring Item Test point Adjustment part Description instrument Check of Signal B1 (pin 1) 1. Receive a black and white signal. generator GND (pin 5) 2. Connect a DC voltmeter between B1 and GND B1 POWER...
  • Page 19 AV-20NX3 VC (VIDEO/CHROMA) CIRCUIT ADJUSTMENTS The setting (adjustment) using the remote control unit is made on the basis of the initial setting values. The setting values which adjust the screen to the optimum condition can be different from the initial setting values.
  • Page 20 AV-20NX3 Measuring Item Test point Adjustment part Description instrument Signal 2. DRIVE (R) Notes: Adjustment of WHITE generator DRIVE (G) • Proceed to the following adjustment after having completed the ad- BALANCE DRIVE (B) justment of LOW LIGHT WHITE BALANCE.
  • Page 21 AV-20NX3 Measuring Item Test point Adjustment part Description instrument Remote 5. COLOUR [Method of adjustment without measuring instrument] Adjustment control unit Notes: • Proceed to the following adjustment after having completed the ad- COLOUR-I justment of SUB CONT. • Set PICTURE MODE (VSM) to “BRIGHT”.
  • Page 22 AV-20NX3 Measuring Item Test point Adjustment part Description instrument Adjustment Signal 6. TINT [Method of adjustment without measuring instrument] generator Notes: SUB TINT-I • Proceed to the following adjustment after having completed the Remote adjustment of SUB CONT. control unit •...
  • Page 23 AV-20NX3 DEFLECTION CIRCUIT ADJUSTMENTS The setting (adjustment) using the remote control unit is made on the basis of the initial setting values. The setting values which adjust the screen to the optimum condition can be different from the initial setting values.
  • Page 24 AV-20NX3 Measuring Item Test point Adjustment part Description instrument Adjustment 2. VER. HEIGHT 9. Receive a PAL cross-hatch signal. Signal 10. Select 2. VER. HEIGHT with the MENU &/^ key. 13. V. ZOOM generator V. HEIGHT 11. Set the initial setting value of 2. VER. HEIGHT with the MENU */Tkey.
  • Page 25 AV-20NX3 Measuring Item Test point Adjustment part Description instrument 23. Select 7. EW-PIN with the MENU &/^ key. Adjustment 7. EW-PIN Signal 24. Set the initial setting value of 7. EW-PIN with the MENU */Tkey. generator SIDE PIN 25. Adjust 7. EW-PIN so that the first vertical lines at the left and right edges on the screen are straight.
  • Page 26 AV-20NX3 Measuring Item Test point Adjustment part Description instrument 32. Select 9. UP CORNER with the MENU &/^ key. Adjustment 9. UP CORNER Signal 10. DW CORNER 33. Set the initial setting value of 9. UP CORNER with the MENU generator */Tkey.
  • Page 27 AV-20NX3 [COMPRESS (16 : 9) : ON, fv: 50Hz mode ] Measuring Item Test point Adjustment part Description instrument Adjustment Signal 13. V. ZOOM 1. Receive a PAL cross-hatch signal of vertical frrequency 50Hz. generator 2. VER. HEIGHT 2. Select COMPRESS from the MENU and set COMPRESS to ON.
  • Page 28 AV-20NX3 [COMPRESS (16 : 9) : OFF, fv: 60Hz mode ] Measuring Item Test point Adjustment part Description instrument Adjustment Signal 1. VER. SLOPE 1. Receive a NTSC circle pattern signal of vertical frequency 60Hz. generator 2. Select 3. DEF from the SERVICE MENU.
  • Page 29 AV-20NX3 Measuring Item Test point Adjustment part Description instrument Adjustment 2. VER. HEIGHT 9. Receive a NTSC cross-hatch signal. Signal 10. Select 2. VER. HEIGHT with the MENU &/^ key. 13. V. ZOOM generator V. HEIGHT 11. Set the initial setting value of 2. VER. HEIGHT with the MENU */Tkey.
  • Page 30 AV-20NX3 Measuring Item Test point Adjustment part Description instrument 23. Select 7. EW-PIN with the MENU &/^ key. Adjustment 7. EW-PIN Signal 24. Set the initial setting value of 7. EW-PIN with the MENU */Tkey. generator SIDE PIN 25. Adjust 7. EW-PIN so that the first vertical lines at the left and right edges on the screen are straight.
  • Page 31 AV-20NX3 Measuring Item Test point Adjustment part Description instrument 32. Select 9. UP CORNER with the MENU &/^ key. Adjustment 9. UP CORNER Signal 10. DW CORNER 33. Set the initial setting value of 9. UP CORNER with the MENU generator */Tkey.
  • Page 32 AV-20NX3 [COMPRESS (16 : 9) : ON, fV: 60Hz mode ] Measuring Item Test point Adjustment part Description instrument Signal 13. V. ZOOM 1. Receive a NTSC cross-hatch signal of vertical frrequency 60Hz. Adjustment generator 2. VER. HEIGHT 2. Select COMPRESS from the MENU and set COMPRESS to ON.
  • Page 33 AV-20NX3 [VIDEO - 2 SET : COMPONENT, fv: 50/60Hz mode] Measuring Item Test point Adjustment part Description instrument Adjustment 5. HOR. POSITION 1. Receive a PAL circle pattern signal to VIDEO-2 terminal. Signal 2. Select VIDEO-2 SET from the MENU and set VIDEO-2 SET to generator H.
  • Page 34 AV-20NX3 PRESET SETTING • Do not adjust 5. PRESET in the SERVICE MENU as it requires no adjustment. [SUB MENU 5. PRESET] Setting item Variable range Initial setting value PSNS IFLH AFCW 00/01/10/11 50 – 95 READ STATUS — —...
  • Page 35 AV-20NX3 PURITY ADJUSTMENT Note: The final adjustment of CONVERGENCE must be done after the FOCUS adjustment. (CONVERGENCE is changed by FOCUS adjustment.) When makes difference by FOCUS adjustment, should be WEDGE DEFLECTION reconfirming PURITY adjustment. YOKE 1. Demagnetize CRT with the demagnetizer.
  • Page 36 AV-20NX3 CONVERGENCE ADJUSTMENTS STATIC CONVERGENCE ADJUSTMENT 1. Input a crosshatch signal. 2. Using 4-pole convergence magnets, overlap the red and blue lines in the centre of the screen (Fig. 4) and turn them to magenta (red/blue). (FRONT VIEW) 3. Using 6-pole convergence magnets, overlap the magenta(red/blue) and green lines in the centre of the screen and turn them to white.
  • Page 37 AV-20NX3 SELF-CHECK FUNCTIONS 1. Outline This model has self-check functions given below.When an abnormality has been detected,the SUB POWER is turned off and both ECO and ON TIMER LEDs flash to inform of the failure.An abnormality is detected by the signal input state of the control line connected to the microcomputer.
  • Page 38 AV-20NX3 SERVICE NOTE : No. 52079...

  • Page 39: Parts List

    VICTOR COMPANY OF JAPAN, LIMITED HOME AV NETWORK BUSINESS UNIT. 12,3-chome,Moriya-cho,Kanagawa-ku,Yokohama,Kanagawa-prefecture,221-8528,Japan Printed in Japan AV20NX3-H 0211 WPC...