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JVC AV-21PM Service Manual

Jvc av-21pm colour television service manual
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SERVICE MANUAL
CONTENTS
SPECIFICATIONS ........................................................................................................................... 2
SAFETY PRECAUTIONS ................................................................................................................ 3
FEATURES ...................................................................................................................................... 4
OPERATING INSTRUCTIONS (APPENDED) .............................................................................. 1-1
SPECIFIC SERVICE INSTRUCTIONS ............................................................................................ 4
SERVICE ADJUSTMENTS ............................................................................................................ 10
STANDARD CIRCUIT DIAGRAM (APPENDED) ......................................................................... 2-1
PARTS LIST ................................................................................................................................... 28
COPYRIGHT © 2000 VICTOR COMPANY OF JAPAN, LTD.
COLOUR TELEVISION
AV-21PM
−
+
−
+
No. 56055
AV-21PM
AV-21PM
BASIC CHASSIS
CG-F
No. 56055
1
Aug. 2000

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Summary of Contents for JVC AV-21PM

  • Page 1: Table Of Contents

    AV-21PM AV-21PM SERVICE MANUAL COLOUR TELEVISION BASIC CHASSIS CG-F AV-21PM − − CONTENTS SPECIFICATIONS ........................... 2 SAFETY PRECAUTIONS ........................ 3 FEATURES ............................4 OPERATING INSTRUCTIONS (APPENDED) ................1-1 SPECIFIC SERVICE INSTRUCTIONS .................... 4 SERVICE ADJUSTMENTS ......................10 STANDARD CIRCUIT DIAGRAM (APPENDED) ................. 2-1 PARTS LIST ...........................

  • Page 2: Specifications

    AV-21PM SPECIFICATIONS Item Content Dimensions (W × H × D) 596mm × 468.5mm × 481.5mm Mass 25kg 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-21PM SAFETY PRECAUTIONS 1. The design of this product contains special hardware, many 8. When service is required, observe the original lead dress. Ex- circuits and components specially for safety purposes. For con- tra precaution should be given to assure correct lead dress in tinued protection, no changes should be made to the original the high voltage circuit area.

  • Page 4: Features

    AV-21PM FEATURES New chassis design enables use of an interactive on- By means of AUTO PROGRAM, the TV stations can be screen control. selected automatically and the TV channels can also be Wide range voltage for AC power input. rearranged automatically.
  • Page 5 AV-21PM FRONT CABINET (×4) SPEAKER (×2) CRT SOCKET FRONT CONTROL PWB CONTROL BASE MAIN PWB CLAW (×4) Fig. 1 CLAW SPEAKER (×2) PB BASE REAR COVER (×7) Fig. 2 No. 56055...

  • Page 6: Replacement Of Memory Ic

    AV-21PM REPLACEMENT OF MEMORY IC MEMORY IC (6) User setting Check the user setting values in Table 2, and if setting This TV uses the following memory IC. value is different, set the correct value. Memory IC: IC1702 on MAIN PW Board For setting, refer to the OPERATING INSTRUCTIONS.
  • Page 7 AV-21PM SETTING OF SYSTEM CONSTANT SET Table 1 Setting item Setting contents Setting value COLOUR MULTI MULTI. TRIPLE BILINGUAL TUNER ECO SENSOR LANGUAGE E/R/A/F E/R/A/F E/A/F B/B SOUND LOCK COLOUR AUTO MINT MINT MQSS TEXT RATE AMP TUNER EW-PIN IC...
  • Page 8 AV-21PM SERVICE MENU SETTING ITEMS Table 3 Service menu Setting item Service menu Setting item 1. IF 1. VCO 5. PRESET 1. C-TRAP FIX 2. DELAY POINT 2. SHARP PEAK 3. ABL 4. GAMMA 2. V / C 1. CUTOFF(R/G/B) 5.

  • Page 9: Replacement Of Chip Component

    AV-21PM 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 10: Service Adjustments

    AV-21PM SERVICE ADJUSTMENTS BEFORE STARTING SERVICE ADJUSTMENT 7. Preparation for adjustment (presetting): 1. There are 2 ways for adjusting this TV: One is with the Unless otherwise specified in the adjustment items, preset the REMOTE CONTROL UNIT and the other is the conventional following functions with the remote control unit.
  • Page 11 AV-21PM 3. BASIC OPERATION IN SERVICE MENU SERVICE MENU (1) How to enter SERVICE MENU Press the DISPLAY key and the PICTURE MODE key on SERVICE MENU the remote control unit simultaneously. 1. IF 2. V/C The SERVICE MENU screen will be displayed. (See Fig. 1.) 3.
  • Page 12 AV-21PM SUB MENU SCREEN SERVICE MENU SUB MENU 1. IF SERVICE MENU VCO (CW) 1. IF 2. V/C TOO HIGH 3. DEF 4. VSM PRESET ABOVE REFERENCE 1. VCO 5. PRESET JUST REFERENCE 2. DELAY POINT 6. TURBO TIMER OFF...

  • Page 13: Main Pwb

    AV-21PM ADJUSTMENT LOCATIONS FRONT FRONT CONTROL PWB F901 POWER CN002 CN003 FRONT MAIN PWB CN002 CN003 IC702 MEMORY IC IC701 MICRO PROCESSOR 1 Pin TP-91(B1) 2 Pin NC 3 Pin X-RAY1 4 Pin X-RAY2 5 Pin TP-E ( IC301 TUNER...
  • Page 14 AV-21PM ADJUSTMENTS B1 POWER SUPPLY Measuring Description Item Test point Adjustment part instrument Check of Signal TP-91 (B1) 1. Receive a whole black signal. B1 POWER Generator TP-E (" " " " " ) 2. Connect a DC voltmeter between TP-91 (B1) and TP-E (") SUPPLY (between pins 1 and 5 of the connector S1).
  • Page 15 AV-21PM Measuring Description Item Test point Adjustment part instrument Adjustment Remote DELAY POINT 1. Receive a black and white signal (colour off). of DELAY control unit (AGC TAKE-OVER) 2. Select 1. IF from the SERVICE MENU. POINT 3. Select 2. DELAY POINT by pressing the 2 key on the remote control.
  • Page 16 AV-21PM Measuring Description Item Test point Adjustment part instrument Adjustment Signal 1. CUTOFF (R) 1. Receive a black and white signal (colour off). of WHITE generator CUTOFF (G) 2. Select 2. V/C from the SERVICE MENU. 3. Select 1. CUTOFF (R), (G) and (B) with the MENU a key,...
  • Page 17 AV-21PM Measuring Description Item Test point Adjustment part instrument 1. Receive any broadcast. Adjustment Remote 3. BRIGHT 2. Select 2. V/C from the SERVICE MENU. control unit 3. Select 3. BRIGHT with the MENU a key. 4. Set the initial setting value with the MENU − or + key.
  • Page 18 AV-21PM Measuring Description Item Test point Adjustment part instrument Adjustment Signal TP-47G 5. COLOUR [Method of adjustment using measuring instrument] of SUB generator TP-E (" " " " " ) COLOUR-II [CRT Oscillo- SOCKET PAL COLOUR (PAL COLOUR) scope PWB] 1.
  • Page 19 AV-21PM Measuring Description Item Test point Adjustment part instrument Adjustment Signal TP-47G 6. TINT [Method of adjustment using measuring instrument] generator TP-E (" " " " " ) SUB TINT-II [CRT Oscillo- SOCKET NTSC 3.58 TINT (NTSC 3.58 TINT) 1. Receive a NTSC 3.58 colour bar signal (full field colour bar...
  • Page 20 AV-21PM DEFLECTION CIRCUIT ADJUSTMENT There are 2 modes of adjustment (initial setting value) — 50Hz mode and 60Hz mode — depending upon the kind of signals (vertical frequency 50Hz / 60Hz). When adjusted in 50Hz mode, 60Hz mode will be automatically set.
  • Page 21 AV-21PM Measuring Description Item Test point Adjustment part instrument Adjustment 3. VER. HEIGHT 6. Receive a cross-hatch signal. 7. Select 3. VER. HEIGHT with the MENU a key. V-HEIGHT 8. Set the initial setting value of 3. VER. HEIGHT with the MENU −...
  • Page 22 AV-21PM Measuring Description Item Test point Adjustment part instrument 18. Select 8. EW-PIN with the MENU a key. Adjustment 8. EW-PIN 19. Set the initial setting value of 8. EW-PIN with the MENU − / + Straight EW-PIN key. 20. Adjust EW-PIN so that the first vertical lines at the left and right edges on the screen are straight.
  • Page 23 AV-21PM Measuring Description Item Test point Adjustment part instrument 33. Make sure that the adjustment is properly done on the screen of 60Hz mode. 34. Press the DISPLAY key twice to return to the normal screen. [NOTE] When adjust in 60Hz mode, only 60Hz mode is adjust.
  • Page 24 AV-21PM PRESET ADJUSTMENT No adjustment is necessary. Adjust only when you had changed the value by miss operation. [SUB MENU 5. PRESET] Colour system Initial setting value Setting item SECAM NTSC 3.58 NTSC 4.43 1. C-TRAP FIX 2. SHARP PEAK 3.
  • Page 25 AV-21PM PURITY, CONVERGENCE ADJUSTMENT PURITY ADJUSTMENT 1. Demagnetize CRT with the demagnetizer. WEDGE DEFLECTION YOKE 2. Loosen the retainer screw of the deflection yoke. 3. Remove the wedges. (Fig. 1.) 4. Input a green raster signal from the signal generator, and turn the screen to green raster.
  • Page 26 AV-21PM STATIC CONVERGENCE ADJUSTMENT 1. Input a cross-hatch signal. 2. Using 4-pole convergence magnets, overlap the red and blue lines in the center of the screen (Fig. 1) to 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 to turn them to white.
  • Page 27 AV-21PM 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 POWER 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 28: Parts List

    AV-21PM VICTOR COMPANY OF JAPAN, LIMITED TELEVISION RECEIVER DIVISION 1106 Heta, Iwai-city, Ibaraki-prefecture, 306-0698, Japan AV21PM-H #3 CTH 0008 No. 56055...

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