JVC AV-20320/S Service Manual
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JVC AV-20320/S Service Manual

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SERVICE MANUAL
CONTENTS
SPECIFICATIONS
SAFETY PRECAUTIONS
FEATURES
MAIN DIFFERENCE LIST
SPECIFIC SERVICE INSTRUCTIONS
SERVICE ADJUSTMENTS
PARTS LIST
OPERATING INSTRUCTIONS
STANDARD CIRCUIT DIAGRAM
1
COLOR TELEVISION
AV-20320
AV-20321
COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.
/S
/S
AV-20320
AV-20321
BASIC CHASSIS
FV5
2
3
4
5
6
11
27
2-1
No.51964
Mar. 2002
Mar. 2002

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  • Page 1 AV-20320 AV-20321 SERVICE MANUAL COLOR TELEVISION AV-20320 BASIC CHASSIS AV-20321 CONTENTS SPECIFICATIONS SAFETY PRECAUTIONS FEATURES MAIN DIFFERENCE LIST SPECIFIC SERVICE INSTRUCTIONS SERVICE ADJUSTMENTS PARTS LIST OPERATING INSTRUCTIONS STANDARD CIRCUIT DIAGRAM No.51964 COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD. Mar. 2002 Mar.
  • Page 2 AV-20320 AV-20321 SPECIFICATIONS Items Content 19-7/8 17-7/8 19-1/2 / 50.3cm 45.2cm 49.3cm Dimensions (W H D) 43.8 Ibs / 19.9 kg Mass CCIR(M) TV RF System NTSC / BTSC System (Multi Channel Sound) Color Sound System TV Receiving Channels and Frequency (02 06) 54MHz 88MHz VL Band (07 13) 174MHz 216MHz...
  • Page 3 AV-20320 AV-20321 SAFETY PRECAUTIONS 1. The design of this product contains special hardware, many 10. Isolation Check circuits and components specially for safety purposes. For (Safety for Electrical Shock Hazard) continued protection, no changes should be made to the After re-assembling the product, always perform an isolation original design unless authorized in writing by the manufacturer.
  • Page 4 AV-20320 AV-20321 FEATURES New chassis design enables use of a single board with simplified Adoption of the VIDEO STATUS function. circuitry. Adoption of the ON/OFF TIMER function. Provided with miniature tuner (TV/CATV). Adoption of the HYPER SURROUND function. Multifunctional remote control permits picture adjustment. With 75 V/U in common (F-Type) ANT Terminal.
  • Page 5 AV-20320 AV-20321 MAIN DIFFERENCE LIST Model AV-20320 AV-20321 Parts Name MAIN PWB SFV-1077A-M2 SFV-1083A-M2 QMPD390-200-JS QMPD209-200-JC POWER CORD (Within MAIN PWB) (Within MAIN PWB) FRONT CABINET LC10109-016A-A LC10109-017A-A POWER KNOB LC30376-001A-A LC30376-002A-A PUSH KNOB LC30271-001A-A LC30271-002A-A REAR COVER LC10108-001E-A LC10108-003D-A POWER CORD CLAMP LC20106-001D-A LC20106-002C-A...
  • Page 6 AV-20320 AV-20321 SPECIFIC SERVICE INSTRUCTIONS DISASSEMBLY PROCEDURE REMOVING THE REAR COVER 1. Unplug the power supply cord. 2. Remove the 5 screws marked and 2 screws marked shown in Fig.1. 3. Withdraw the REAR COVER toward you. [CAUTION] When reinstalling the rear cover, carefully push it inward after inserting the MAIN PWB into the rear cover groove.
  • Page 7 AV-20320 AV-20321 FRONT CABINET CRT SOCKET PWB (Within MAIN PWB) SPEAKER BRAIDED ASS’Y DEG. COIL MAIN PWB TUNER REAR COVER PWB STOPPER ( 2) ( 5) Fig.1 No. 51964...
  • Page 8 AV-20320 AV-20321 MEMORY IC REPLACEMENT 1. Memory IC This model use a memory IC. This memory IC stores data for proper operation of the video and deflection circuits. When replacing, be sure to use an IC containing this (initial value) data. 2.
  • Page 9 AV-20320 AV-20321 TABLE 1 (System Constant setting) Setting value Setting item Setting content AV-20320/S AV-20321/S MODEL Display the each application model Conformable model name V-CHIP CAN V-CHIP TABLE 2 (User setting value) Setting item Setting value 1. Use remote controller keys...
  • Page 10 AV-20320 AV-20321 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. SOLDERING IRON 1.
  • Page 11 AV-20320 AV-20321 SERVICE ADJUSTMENTS ADJUSTMENT PREPARATION: 1. You can make the necessary adjustments for this unit with 6. Never touch any adjustment parts which are not specified in the list for this adjustment - variable resistors, transformers, either the Remote Control Unit or With the adjustment condensers, etc.
  • Page 12 AV-20320 AV-20321 ADJUSTMENT LOCATIONS REMOCON VOL+ VOL- MENU RECEIVER POWER FRONT TIMER IC701 IC702 STEREO MAIN PWB F901 DEG. TP-12B IC421 T131 CW R926 IC201 F902 TP-91 (B1) TUNER IC921 TP-E UPPER : FOCUS AV IN OUT LOWER : SCREEN CRT SOCKET PWB (Within MAIN PWB ASS'Y) TP-R...
  • Page 13 AV-20320 AV-20321 BASIC OPERATION SERVICE MENU 1. TOOL OF SERVICE MENU OPERATION Operate the SERVICE MENU with the REMOTE CONTROL UNIT. 2. SERVICE MENU ITEMS In general, basic setting(adjustments) items or verifications are performed in the SERVICE MENU. PICTURE This sets the setting values (adjustment values) of the VIDEO/CHROMA and DEFLECTION circuits. SOUND This sets the setting values (adjustment values) of the AUDIO circuit.
  • Page 14 AV-20320 AV-20321 SERVICE MENU (MAIN MENU) SCREEN PICTURE MODE SERVICE MENU SOUND PICTURE GAME LOW LIGHT HIGH LIGHT RF AFC CHK 1. BRIGHT VCO(CW) STATUS ******** ******** ******** ******** EXIT BY EXIT BY EXIT BY SELECT BY SELECT BY SELECT BY OPERATE BY OPERATE BY EXIT...
  • Page 15 AV-20320 AV-20321 (4) Setting method 1) UP / DOWN key of the MENU Select the SETTING ITEM. 2) LEFT / RIGHT key of the MENU Setting(adjust) the INITIAL SETTING VALUE of the SETTING ITEM. When the key is released the SETTING VALUE will be stored 1.
  • Page 16 ( ) are off-set values.) When the four items (No.7, 8, 11 and 12) are adjusted in the video mode, the setting values in each item are revised independently. Initial setting value Setting (Adjustment) items Variable range AV-20320/S AV-20321/S BRIGHT PICTURE TV DTL(TV DETAIL) TV BPF(TV B.P.FILTER)
  • Page 17 AV-20320 AV-20321 GAME MODE Setting (Adjustment) item Variable range Initial setting value TINT COLOR PICTURE BRIGHT DETAIL LOW LIGHT MODE Setting (Adjustment) item Variable range initial setting value R CUTOFF G CUTOFF B CUTOFF HIGH LIGHT MODE Setting (Adjustment) item Variable range initial setting value G DRIVE...
  • Page 18 AV-20320 AV-20321 ADJUSTMENTS B1 POWER SUPPLY Measuring Item Test point Adjustment part Description instrument 1. Receive a black-and-white signal. Check of DC Voltmeter TP-91 (B1) 2. Connect the DC Voltmeter to TP-91 (B1) and TP-E( )(See the B1 POWER TP-E( SUPPLY page of Adjustment Locations) 3.
  • Page 19 AV-20320 AV-20321 Measuring Item Test point Adjustment part Description instruments V.SIZE Signal No.13 V.SIZE 1. Receive a crosshatch signal. Adjustment generator 2. Select No.13 V SIZE in the PICTURE MODE. 3. Set the initial setting value of No.13 V SIZE with the LEFT / RIGHT key of the MENU.
  • Page 20 AV-20320 AV-20321 ADJUSTMENT OF WHITE BALANCE Measuring Item Test point Adjustment part Description instruments WHITE Signal BRIGHT 1. Receive a black-and-white signal.(Color off) BALANCE generator 1. Select the LOW LIGHT MODE from the SERVICE MENU. (Low Light) R. CUTOFF 3. Set the initial setting value of BRIGHT with the LEFT / Adjustment G.
  • Page 21 AV-20320 AV-20321 ADJUSTMENT OF PICTURE Measuring Item Test point Adjustment part Description instruments No.1 BRIGHT 1. Receive a broadcast. 2. Select No.1 BRIGHT of the PICTURE MODE. BRIGHT Adjustment 3. Set the initial setting value of the No.1 BRIGHT with the LEFT / RIGHT key of the MENU.
  • Page 22 AV-20320 AV-20321 Measuring Item Test point Adjustment part Description instrument MTS SAP Signal No.8 5FH MON. 1. Receive a RF signal (non modulated sound signal) from the generator antenna terminal. Connector adjustment No.9 SAP VCO 2. Connect between pin 4 of MPX connector and GND (Pin 4 pin SDA Frequency 3 of...
  • Page 23 AV-20320 AV-20321 ADJUSTMENT OF PURITY / CONVERGENCE PURITY ADJUSTMENT 1. Demagnetize CRT with the demagnetizer. WEDGE DEFLECTION 2. Loosen the retainer screw of the deflection yoke. YOKE 3. Remove the wedges. 4. Input a green raster signal from the signal generator, and turn the screen to green raster.
  • Page 24 AV-20320 AV-20321 STATIC CONVERGENCE ADJUSTMENT 1. Input a crosshatch signal. 2. Using 4-pole convergence magnets, overlap the red and blue lines in the center of the screen (Fig.1) and turn them to magenta (red/blue). (FRONT VIEW ) 3. Using 6-pole convergence magnets, overlap...
  • Page 25 AV-20320 AV-20321 HOW TO CHECK THE HIGH VOLTAGE HOLD DOWN CIRCUIT 1. HIGH VOLTAGE HOLD DOWN CIRCUIT After repairing the high voltage hold down circuit shown in Fig. 1. This circuit shall be checked to operate correctly. 2. CHECKING OF THE HIGH VOLTAGE HOLD DOWN CIRCUIT (1) Turn the POWER SW ON.
  • Page 26 AV-20320 AV-20321 SELF CHECK FUNCTIONS 1. Outline This model has self check functions given below. When a malfunction has been detected, the POWER is turned off and the LED flashes to inform of the failure . The malfunction is detected by the signal input state of the control line connected to the microcomputer. 2.
  • Page 27 AV-20320 AV-20321 SCHEMATIC DIAGRAMS COLOR TELEVISION AV-20320 BASIC CHASSIS AV-20321 FV 5 CD-ROM No.SML200203 CONTENTS NOTE ON USING CIRCUIT DIAGRAMS SEMICONDUCTOR SHAPES BLOCK DIAGRAM CIRCUIT DIAGRAMS PATTERN DIAGRAMS CHANNEL CHART 2-11 No.51964 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. Mar. 2002...
  • Page 28 AV-20320 AV-20320 AV-20321 AV-20321 CHANNEL CHART (CA) AV-20320 ,AV-20321 MODE CHANNEL MODE CHANNEL TUNER TUNER BAND BAND BAND BAND CATV REAL DISP CATV REAL DISP STANDARD CIRCUIT DIAGRAM W+35 W+36 W+37 NOTE ON USING CIRCUIT DIAGRAMS W+38 W+39 1.SAFETY W+40 Type W+41 The components identified by the...
  • Page 29 AV-20320 AV-20320 AV-20321 AV-20321 CHANNEL CHART (US) CONTENTS MODE CHANNEL MODE CHANNEL TUNER TUNER BAND BAND BAND BAND CATV REAL DISP CATV REAL DISP SEMICONDUCTOR SHAPES W+35 W+36 BLOCK DIAGRAM W+37 W+38 CIRCUIT DIAGRAMS W+39 W+40 MAIN PWB CIRCUIT DIAGRAM W+41 W+42 PATTERN DIAGRAMS...
  • Page 30 AV-20320 AV-20320 AV-20321 AV-20321 BLOCK DIAGRAM IC602 AUDIO AMP REMOCON RECEIVER R / G / B IC701 MICRO COMPUTER IC702 MEMORY YS B G R CRT SOCKET 39 40 41 42 TV.V DET Q131 BUFFER CF161 Q271 CF131 4.5 FILTER BUFFER 4.5 TRAP IC421...
  • Page 31 AV-20320 AV-20320 AV-20321 AV-20321 CIRCUIT DIAGRAMS MAIN PWB CIRCUIT DIAGRAMS CEMN072-002 CEMN065-002 CEMN065-001 J007 J005 J006 IC751 J602 QNS0155-001 R751 D751 MENU GP1UM281QK IC602 LA4446 POWER VOL+ VOL- SLR-342VR3F SP01 S756 S755 S754 S753 S752 S751 SP02 QSW0619-003Z QSW0619-003Z QSW0619-003Z QSW0619-003Z QSW0619-003Z QSW0619-003Z...
  • Page 32 AV-20320 AV-20320 AV-20321 AV-20321 MAIN & CRT SOCKET PWB CIRCUIT DIAGRAM PICTURE TUBE CRT SOCKET A51KRE89X(DT) MAIN PWB R385 SK371 R382 QNZ0537-001 2WOMR 1.5k 129.5V R373 Q373 2.2V 2SC4544-LB B.OUT SFV-1077A-M2 C373 1.8V C376 330p R388 R376 R379 2.7k IC421 LA7830 VERT (20320/ IC421...
  • Page 33 AV-20320 AV-20320 AV-20321 AV-20321 PATTERN DIAGRAMS MAIN & CRT SOCKET PWB PATTERN MAIN PWB CRT SOCKET PWB S753 S754 S755 S752 IC751 S751 R762 J006 CH - R373 J007 D752 D751 POWER R385 MENU CH + VOL - VOL + S756 K701 W008...
  • Page 34 AV-20320 AV-20321 PARTS LIST CAUTION The parts identified by the symbol are important for the safety. Whenever replacing these parts, be sure to use specified ones to secure the safety . The parts not indicated in this Parts List and those which are filled with lines in the Parts No.

  • Page 35: Table Of Contents

    AV-20320 AV-20321 CONTENTS EXPLODED VIEW PARTS LIST EXPLODED VIEW PRINTED WIRING BOARD PARTS LIST AV-20320 MAIN PW BOARD ASS'Y(SFV-1077A-M2) (With CRT SOCKET PW BOARD) AV-20321 MAIN PW BOARD ASS'Y(SFV-1083A-M2) (With CRT SOCKET PW BOARD) REMOTE CONTROL UNIT PARTS LIST PACKING PACKING PARTS LIST EXPLODED VIEW PARTS LIST AV-20320...

  • Page 36: Exploded View

    AV-20320 AV-20321 EXPLODED VIEW DY01 CRT SOCKET PWB (Within MAIN PWB) MAIN PWB T1522 ( 2) ( 5) No. 51964...

  • Page 37: Printed Wiring Board Parts List

    AV-20320 PRINTED WIRING BOARD PARTS LIST [ AV-20320 MAIN P.W. BOARD ASS’Y (SFV-1077A-M2) No. 51964...
  • Page 38 AV-20320 [ AV-20320 No. 51964...
  • Page 39 AV-20320 [ AV-20320 No. 51964...
  • Page 40 AV-20320 [ AV-20320 No. 51964...

  • Page 41: Av-20321 /S

    AV-20320 AV-20321 [AV-20321 MAIN P.W. BOARD ASS'Y (SFV-1083A-M2) Regarding the parts list for the main PW board ass’y SFV-1083A-M2 , only the different parts from those of the SFV-1077A-M2 are described. For further details regarding the other parts, refer to the parts list for the SFV-1077A-M2 described on page 30 through page 33.

  • Page 42: Packing

    AV-20320 AV-20321 PACKING ( 4) PACKING PARTS LIST AV-20320 /S Charcoal Model AV-20321 /S White Model No. 51964...

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