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JVC AV-21F9 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 ................................................................................................................................... 27
COPYRIGHT © 2000 VICTOR COMPANY OF JAPAN, LTD.

COLOUR TELEVISION

AV-21F9
−
+
−
+
(NS)
No. 56037
AV-21F9
AV-21F9
BASIC CHASSIS
CM-II'
No. 56037
1
Aug. 2000

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Summary of Contents for JVC AV-21F9

  • Page 1: Colour Television

    AV-21F9 AV-21F9 SERVICE MANUAL COLOUR TELEVISION BASIC CHASSIS CM-II' AV-21F9 (NS) − − 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: Replacement Of Memory Ic

    AV-21F9 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 3 AV-21F9 SETTING OF SYSTEM CONSTANT SET Table 1 Setting item Setting contents Setting value 1. COLOUR AUTO 2. COLOUR MULTI. TRIPLE MULTI 3. ECO SENSOR YES-BB YES-BB-SB YES-SB 4. BASS NO-SB-ON NO-SB-OFF NO-SB-ON YES-BA 5. VOL. LIMITER 6. TEXT 7. MSP NO-A2 8.
  • Page 4 AV-21F9 SERVICE MENU SETTING ITEMS Table 3 Service menu Setting item Service menu Setting item 1. IF 1. VCO 3. AUDIO 1. ERROR LIMIT 2. DELAY POINT 2. A2 ID THR Do not adjust. 3. SOUND SYSTEM 2. V / C 1.

  • Page 5: Service Adjustments

    AV-21F9 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 6 AV-21F9 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 3. AUDIO The SERVICE MENU screen will be displayed. (See Fig. 1.) 4.
  • Page 7 AV-21F9 SUB MENU SCREEN SERVICE MENU SUB MENU 1. IF SERVICE MENU VCO (CW) 1. IF 2. V/C 3. AUDIO 4. DEF 5. VSM PRESET 1. VCO TOO HIGH 6. CENTER ABOVE REFERENCE 2. DELAY POINT 7. TURBO TIMER OFF...
  • Page 8 AV-21F9 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 9 AV-21F9 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 10 AV-21F9 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 MENU a key, and...
  • Page 11 AV-21F9 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 12 AV-21F9 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 13 AV-21F9 Measuring Description Item Test point Adjustment part instrument Adjustment Remote 6. TINT [Method of adjustment without measuring instrument] control unit SUB TINT-I NTSC 3.58 TINT (NTSC 3.58 TINT) 1. Receive a NTSC 3.58 colour bar signal (full field colour bar 75% white).
  • Page 14 AV-21F9 Measuring Description Item Test point Adjustment part instrument Adjustment Remote [Method of adjustment without measuring instrument] of BLACK control unit OFFSET-I (SECAM) 7. BLACK OFFSET 1. Receive a SECAM broadcast. (R-Y) 2. Select 2. V/C from the SERVICE MENU.
  • Page 15 AV-21F9 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 16 AV-21F9 Measuring Description Item Test point Adjustment part instrument Adjustment 4. H. CENT 10. Receive a circle pattern signal. 11. Select 4. H-CENT with the MENU a key. 12. Set the initial setting value of 4. H. CENT with the MENU − / + H.
  • Page 17 AV-21F9 VSM PRESET ADJUSTMENT Measuring Description Item Test point Adjustment part instrument Setting of Remote 1. TINT (VSM PRESET) control unit 2. COLOUR 1. Select 5. VSM PRESET from the SERVICE MENU. PRESET 3. BRIGHT 2. Select BRIGHT with the PICTURE MODE key.
  • Page 18 AV-21F9 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 the ON TIMER LED flashes to inform of the failure. An abnormality is detected by the signal input state of the control line connected to the microcomputer.

  • Page 19: Standard Circuit Diagram

    AV-21F9 STANDARD CIRCUIT DIAGRAM NOTE ON USING CIRCUIT DIAGRAMS Type No indication : Ceramic capacitor 1. SAFETY : Mylar capacitor The components identified by the ! ! ! ! ! symbol and shading are : Metalized mylar capacitor critical for safety. For continued safety replace safety critical : Polypropylene capacitor components only with manufactures recommended parts.

  • Page 20: Table Of Contents

    AV-21F9 CONTENTS SEMICONDUCTOR SHAPES ............2-4 BLOCK DIAGRAM ................2-5 CIRCUIT DIAGRAMS MAIN PWB CIRCUIT DIAGRAM ....................2-7 AV SW PWB CIRCUIT DIAGRAM .................... 2-9 IF PWB CIRCUIT DIAGRAM ....................2-11 CRT SOCKET PWB CIRCUIT DIAGRAM ................2-13 FRONT CONTROL PWB CIRCUIT DIAGRAM ............... 2-15 PATTERN DIAGRAMS FRONT CONTROL PWB PATTERN ..................

  • Page 21: Block Diagram

    AV-21F9 AV-21F9 BLOCK DIAGRAM FRONT IF PWB SP01 MAIN PWB CONTROL CF103 Q104 Q103 IC101 V.OUT BUFFER BUFFER IC681 AUDIO AMP TRAP PIF/SIF/DET. SP02 V.IN Q101 SF101 IF AMP CF106 CF104 5.5 V.IN Q109 Q107 CF105 6.5 BUFFER BUFFER TRAP...

  • Page 22: Circuit Diagrams Main Pwb Circuit Diagram

    AV-21F9 AV-21F9 CIRCUIT DIAGRAMS MAIN PWB CIRCUIT DIAGRAM AV SW PWB ASS’Y FOR FRONT CONTROL PWB ASS’Y PARTS PARTS 21F9-NS 21F9-NS CRT SOCKET PWB ASS’Y CRT SOCKET PWB ASS’Y MAIN PWB ASS’Y SCM-1617A-H2 (AV-21F9-NS) No. 56037 No. 56037...

  • Page 23: Av Sw Pwb Circuit Diagram

    AV-21F9 AV-21F9 AV SW PWB CIRCUIT DIAGRAM AV SW PWB ASS'Y SCM0Y208A-H2 (AV-21F9-NS) No. 56037 2-10 No. 56037...

  • Page 24: If Pwb Circuit Diagram

    AV-21F9 AV-21F9 IF PWB CIRCUIT DIAGRAM PARTS PARTS PARTS PARTS AV-21F9 AV-21F9 AV-21F9 AV-21F9 IF PWB ASS'Y SCM0F201A-H2 (AV-21F9-NS) 2-11 2-12 No. 56037 No. 56037...

  • Page 25: Crt Socket Pwb Circuit Diagram

    AV-21F9 AV-21F9 CRT SOCKET CIRCUIT DIAGRAM A51LMV20X MAIN PWB ASS'Y PARTS AV-21F9 SCM-3201A-H2 (AV-21F9-NS) FOR MAIN PWB ASS'Y 2-13 2-14 No. 56037 No. 56037...
  • Page 26 MENU CHANNEL VOLUME ON TIMER POWER EXIT PICTURE MODE CHANNEL SCAN RETURN ECO SENSOR OFF TIMER...

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