JVC AV-21L11 Service Manual
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JVC AV-21L11 Service Manual

JVC AV-21L11 Service Manual

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SERVICE MANUAL

DISPLAY
CHANNEL
CLOSED
CAPTION
TV/VIDEO
PICTURE MODE
CHANNEL SCAN
ECO SENSOR
RM-C248-2C
CONTENTS
SPECIFICATIONS ....................................................................................................................................2
SAFETY PRECAUTIONS ........................................................................................................................3
FEATURES ..............................................................................................................................................4
FUNCTIONS .............................................................................................................................................5
SPECIFIC SERVICE INSTRUCTIONS ....................................................................................................6
¤
OPERATING INSTRUCTIONS (APPENDIX) ....................................................................................... 1-1
SERVICE ADJUSTMENTS ....................................................................................................................14
¤
STANDARD CIRCUIT DIAGRAM (APPENDIX) .................................................................................. 2-1
PARTS LIST ...........................................................................................................................................35
COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.
COLOR TELEVISION
AV-21L11
AV-21L31
AV-25L31
POWER
MENU
VOLUME
MUTING
1
2
3
4
5
6
7
8
9
RETURN
0
100
OFF TIMER
RM-C248 REMOTE CONTROL UNIT
(-PH)
(-PH)
(-PH)
AV-21L11
AV-21L31
AV-25L31
BASIC CHASSIS
CH
No. 51904
Sep. 2001

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Summary of Contents for JVC AV-21L11

  • Page 1: Table Of Contents

    AV-21L11 AV-21L31 AV-25L31 SERVICE MANUAL COLOR TELEVISION BASIC CHASSIS AV-21L11 (-PH) AV-21L31 (-PH) AV-25L31 (-PH) POWER DISPLAY MENU CHANNEL VOLUME CLOSED CAPTION MUTING TV/VIDEO PICTURE MODE CHANNEL SCAN RETURN ECO SENSOR OFF TIMER RM-C248 REMOTE CONTROL UNIT RM-C248-2C CONTENTS SPECIFICATIONS ............................2 SAFETY PRECAUTIONS ........................3...

  • Page 2: Specifications

    AV-21L11 AV-21L31 AV-25L31 SPECIFICATIONS Contents Items AV-21L11-PH AV-21L31-PH AV-25L31-PH Dimensions (W × H × D) 59.8cm × 46.8cm × 47.15cm 68.2cm × 53.84cm × 47.75cm Mass 22kg 32kg TV RF System CCIR(M) Color System TV Mode NTSC3.58 VIDEO Mode NTSC3.58...

  • Page 3: Safety Precautions

    AV-21L11 AV-21L31 AV-25L31 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-21L11 AV-21L31 AV-25L31 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-21L11 AV-21L31 AV-25L31 FUNCTIONS FRONT PANEL REAR PANEL COMPONENT VIDEO-1 ( VIDEO-2 ) OUTPUT INPUT INPUT MONO MONO REMOTE CONTROL UNIT RM-C248-2C POWER DISPLAY MENU CHANNEL VOLUME CLOSED CAPTION MUTING TV/VIDEO PICTURE MODE CHANNEL SCAN RETURN ECO SENSOR OFF TIMER RM-C248 REMOTE CONTROL UNIT No.

  • Page 6: Specific Service Instructions

    AV-21L11 AV-21L31 AV-25L31 SPECIFIC SERVICE INSTRUCTIONS DISASSEMBLY PROCEDURE REMOVING THE REAR COVER 1. Unplug the power supply cord. Å ı 2. Remove the 7 or 9 screws marked and 4 screws maked shown in Fig.1. 3. Withdraw the Rear cover toward you.
  • Page 7 AV-21L11 AV-21L31 AV-25L31 PICTURE TUBE FRONT CABINET (×2) (×2) SPEAKER CRT SOCKET PWB MAIN PWB (×2) (×2) SPEAKER PB STOPPER REAR COVER (×7) [AV-21L11-PH, AV-21L31-PH] (×9) [AV-25L31-PH] Except 21” model (×4) Except 21” model Fig.1 No. 51904...
  • Page 8 AV-21L11 AV-21L31 AV-25L31 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: Replacement Of Memory Ic

    AV-21L11 AV-21L31 AV-25L31 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-21L11 AV-21L31 AV-25L31 SETTING OF SYSTEM CONSTANT SET Setting value Setting item Setting content AV-21L11-PH AV-21L31-PH AV-25L31-PH NTSC TRIPLE COLOR SYSTEM NTSC COMB TILT SUPER BASS B/B SOUND TUNER COLOR AUTO LOCK LONG WAIT SHORT WAIT Table 1 No. 51904...

  • Page 11: Operating Instructions

    AV-21L11 AV-21L31 AV-25L31 USER SETTING VALUES Setting item Setting value SUB POWER CHANNEL POSITION CH-02 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 MONO SURROUND...
  • Page 12 AV-21L11 AV-21L31 AV-25L31 SERVICE MENU SETTING ITEMS Service menu Setting item Service menu Setting item 1. IF 1. VCO 5. PRESET 1. CB 2. DELAY POINT 2. ACL Do not adjust 3. MUS 4. MAT 2. VC 1. CUTOFF(R/G) 5. FCO 2.
  • Page 13 AV-21L11 AV-21L31 AV-25L31 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-21L11 AV-21L31 AV-25L31 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: Main Pwb

    AV-21L11 AV-21L31 AV-25L31 ADJUSTMENT LOCATIONS S783 S781 MAIN PWB 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-21L11 AV-21L31 AV-25L31 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-21L11 AV-21L31 AV-25L31 SERVICE MENU SUB MENU 1. IF SERVICE MENU VCO (CW) ***** TOO HIGH 1. IF 2. VC 1. VCO ABOVE REFERENCE 3. DEF 4. VSM PRESET BELOW REFERENCE 5. PRESET 6. AUDIO 2. DELAY POINT TOO LOW 7.

  • Page 18: Focus Adjustment

    AV-21L11 AV-21L31 AV-25L31 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...
  • Page 19 -7 – +8 DRIVE (R/G/B) -30 – +31 BRIGHT (COM./TV/V-1/V-2/V-3) -30 – +31 0/-18/0/0/0 PICTURE -30 – +31 — -12m AV-21L11-PH, AV-21L31-PH COLOR -30 – +31 AV-25L31-PH TINT (TV/VIDEO) -30 – +31 -15/+4 — DETAIL (TV/VIDEO) -30 – +31 -16/-2 —/0...
  • Page 20 AV-21L11 AV-21L31 AV-25L31 Measuring Item Test point Adjustment part Description instrument Signal 2. DRIVE (R) Notes: Adjustment of WHITE generator DRIVE (G) • Proceed to the following this adjustment after having completed the BALANCE DRIVE (B) adjustment of LOW LIGHT WHITE BALANCE.
  • Page 21 AV-21L11 AV-21L31 AV-25L31 Measuring Item Test point Adjustment part Description instrument Remote 5. COLOR [Method of adjustment without measuring instrument] Adjustment control unit Notes: • Proceed to the following this adjustment after having completed the COLOR-I adjustment of SUB PICTURE.
  • Page 22 AV-21L11 AV-21L31 AV-25L31 Measuring Item Test point Adjustment part Description instrument Adjustment Remote 6. TINT [Method of adjustment without measuring instrument] control unit Notes: SUB TINT-I • Proceed to the following this adjustment after having completed the adjustment of SUB PICTURE.
  • Page 23 AV-21L11 AV-21L31 AV-25L31 DEFLECTION CIRCUIT ADJUSTMENT 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-21L11 AV-21L31 AV-25L31 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. ZOOM 11. Set the initial setting value of 2. VER. HEIGHT with the MENU –/+ key.
  • Page 25 AV-21L11 AV-21L31 AV-25L31 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 –/+ key. generator EW-PIN 25.
  • Page 26 AV-21L11 AV-21L31 AV-25L31 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 –/+...
  • Page 27 AV-21L11 AV-21L31 AV-25L31 [COMPRESS (16 : 9) ] Measuring Item Test point Adjustment part Description instrument Adjustment Signal 13. V. ZOOM 1. Receive a NTSC cross-hatch signal. generator 2. VER. HEIGHT 2. Select COMPRESS from the MENU and set COMPRESS to ON.
  • Page 28 AV-21L11 AV-21L31 AV-25L31 [COMPONENT] Measuring Item Test point Adjustment part Description instrument Adjustment 5. HOR. POSITION 1. Receive a NTSC circle pattern signal to VIDEO-2 terminal. Signal 2. Select VIDEO-2 SET from the MENU and set VIDEO-2 SET to generator HOR.
  • Page 29 AV-21L11 AV-21L31 AV-25L31 PRESET ADJUSTMENT • Do not adjust 5. PRESET in the SERVICE MENU as it requires no adjustment. [SUB MENU 5. PRESET] Initial setting value Setting item Variable range AV-21L11-PH AV-21L31-PH AV-25L31-PH IFLH AFCW 00/10/01 50 – 95 READ STATUS —...
  • Page 30 AV-21L11 AV-21L31 AV-25L31 PURITY AND CONVERGENCE ADJUSTMENTS 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 PURITY ADJUSTMENT 1.
  • Page 31 AV-21L11 AV-21L31 STATIC CONVERGENCE ADJUSTMENT [AV-21L11-PH, AV-21L31-PH] 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 center of the screen and turn them to white.
  • Page 32 AV-25L31 STATIC CONVERGENCE ADJUSTMENT [AV-25L31-PH] 1. Input a crosshatch signal. (FRONT VIEW) 2. Using 4-pole convergence magnets, overlap the red and blue lines in the centre of the screen (Fig. 7) and turn them to magenta (red/blue). 3. Using 6-pole convergence magnets, overlap the magenta(red/blue) and green lines in the center of the screen and turn them to white.
  • Page 33 AV-21L11 AV-21L31 AV-25L31 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 34 AV-21L11 AV-21L31 AV-25L31 No. 51904...

  • Page 35: 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 AV21L11PH-SK #4 Printed in Japan AV21L31PH-SK #4 VP0109 AV25L31PH-SK #4...

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Av-21l31Av-25l31

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