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JVC AV-T2912/ZAR Service Manual

Colour television
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SERVICE MANUAL
The following item for the AV-T2912
Therefore, this service manual describes only the items which differ from those of the AV-T2922
service manual.
For details other than those described in this manual, please refer to the AV-T2922
manual (No.51917 Mar. 2002) .
■ OUTLINE
Since the picture tube was changed, we have issued the SERVICE MANUAL for AV-T2912/ZAR.
Since the picture tube was changed, we have issued the SERVICE MANUAL for AV-T292/ZAR.
■ HOW TO IDENTIFY MODELS
Identify that the model name "AV-T2912Z" is printed on the margin of the rating label affixed
to the rear cover.
1
COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.

COLOUR TELEVISION

AV-T2912
Supplement
model was changed partly from AV-T2922
/ZAR
/ZAR
AV-T2912
BASIC CHASSIS
GA
model.
(AR)
(AR)
service
(AR)

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Summary of Contents for JVC AV-T2912/ZAR

  • Page 1: Colour Television

    ■ OUTLINE Since the picture tube was changed, we have issued the SERVICE MANUAL for AV-T292/ZAR. Since the picture tube was changed, we have issued the SERVICE MANUAL for AV-T2912/ZAR. ■ HOW TO IDENTIFY MODELS Identify that the model name “AV-T2912Z” is printed on the margin of the rating label affixed to the rear cover.

  • Page 2: Parts List

    AV-T2922 PARTS LIST CAUTION ! The parts identified by the symbol are important for the s afety. Whenever replacing these parts, be s ure to use s pec ified ones to secure the safety . ! The parts not indic ated in this Parts List and those which are filled with lines 　　 in the Parts No. c olumns will not be supplied. ! P.

  • Page 3: Exploded View

    LC30856-002A-A POWER KNOB CM12985-003-VA CHASSIS BASE QMPR150-200-JC POWER CORD CM23169-001-A POWER CORD CLAMP ! 12 LC10572-001B-D REAR COVER QYSBSFG4016Z TAPPING SCREW ( × 11) QYSBSB3010Z TAPPING SCREW ( × 2) LC30462-008A-D RATING LABEL LC30191-002A-A REMOCON LENS CM48006-007-C JVC MARK No.51917...
  • Page 4 AV-T2922 EXPLODED VIEW CRT SOCKET PWB (W ithin MAIN PWB) FRONT MAIN PWB CONT ROL PWB T1522 ( × 2) ( × 11) No.51917...

  • Page 5: Printed Wiring Board Parts List

    AV-T2922 PRINTED WIRING BOARD PARTS LIST MAIN PW BOARD ASS’Y (SGA-1020A-R2) ! Symbol No. Part No. Part Name Description ! Symbol No. Part No. Part Name Description RESISTOR RESISTOR R1421 NRSA02J-0R0X MG R 0.0 Ω 1/10W J R1001 NRSA02J-563X MG R 56kΩ...
  • Page 6 AV-T2922 ! Symbol No. Part No. Part Name Description ! Symbol No. Part No. Part Name Description RESISTOR RESISTOR R1703 NRSA02J-0R0X MG R 0.0 Ω 1/10W J R1942 NRSA02J-223X MG R 22k Ω 1/10W J R1704 NRSA02J-103X MG R 10kΩ 1/10W J R1943 QRE121J-152Y 1.5kΩ...
  • Page 7 AV-T2922 ! Symbol No. Part No. Part Name Description ! Symbol No. Part No. Part Name Description CAPACITOR CAPACITOR C1403 QEM61EK-225Z E CAP. 2.2 µ F 25V K C1691-92 QETN1HM-106Z E CAP. 10 µ F 50V M C1693-94 NCB21HK-392X C CAP. 3900pF 50V K C1405 QFLC1HJ-104Z...
  • Page 8 AV-T2922 ! Symbol No. Part No. Part Name Description ! Symbol No. Part No. Part Name Description COIL TRANSISTOR L1001 QQL244J-150Z PEAKING COIL Q1401 2SC2412K/QR/-X SI.TRANSISTOR L1003 QQL244J-4R7Z PEAKING COIL ! Q1511 2SC2785/JH/-T SI.TRANSISTOR L1101 QQLZ014-R22 PEAKING COIL Q1521 BSN304-T F.E.T.
  • Page 9 AV-T2922 FRONT CONTROL PW BOARD ASS’Y (SGA-4005A-R2) ! Symbol No. Part No. Part Name Description RESISTOR R4701 QRE121J-103Y 10kΩ 1/2W J R4702 QRE121J-562Y 5.6kΩ 1/2W J R4703-04 QRE121J-103Y 10kΩ 1/2W J R4705 QRE121J-562Y 5.6kΩ 1/2W J R4706 QRE121J-103Y 10kΩ 1/2W J R4707-08 QRE121J-223Y 22kΩ...

  • Page 10: Packing Parts List

    AV-T2922 REMOTE CONTROL UNIT PARTS LIST (RM-C363-1H) ! Ref.No. Part No. Part Name Description 25-1168 B BATTARY COVER (RM-C363-1H) PACKING PACKING PARTS LIST ! Ref.No. Part No. Part Name Description LC10058-017A PACKING CASE LC10774-002A-D CUSHION ASSY 4pcs in 1set CP30899-001-R TOP COVER CP30897-004-R POLY BAG...
  • Page 11 VICT OR COMPANY OF J APAN, LIMIT ED HOME AV NETWORK BU SINESS UNIT 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama, Kanagawa-prefecture, 221-8528, Japan T 2922AR-CK #3 Printed in Japan VP 0203 DP3051...
  • Page 12 AV-T2922 AV-T2922 FRONT CONTROL PWB PATTERN AV-T2922 STANDARD CIRCUIT DIAGRAM NOTE ON USING CIRCUIT DIAGRAMS 1.SAFETY Type C701 The components identified by the symbol and shading are No indication :Ceramic capacitor D701 critical for safety. For continued safety replace safety critical :Metalized mylar capacitor :Polypropylene capacitor components only with manufactures recommended parts.
  • Page 13 AV-T2922 AV-T2922 CRT SOCKET PWB PATTERN CONTENTS SEMICONDUCTOR SHAPES BLOCK DIAGRAM CIRCUIT DIAGRAMS MAIN & FRONT CONTROL PWB CIRCUIT DIAGRAM MAIN & CRT SOCKET PWB CIRCUIT DIAGRAM PATTERN DIAGRAMS MAIN PWB PATTERN CRT SOCKET PWB PATTERN 2-11 FRONT CONTROL PWB PATTERN 2-12 R353 R352...
  • Page 14 AV-T2922 AV-T2922 BLOCK DIAGRAM SP(L) SP(R) IC601 AUDIO AMP REMOCON R.G.B. IC701 CONTROL PWB CRT SOCKET C V IN IC701 MICRO COMPUTER IC702 MEMORY YS. R. G. B. IC251 VIDEO SW IC651 MTS & TONE/VOL CONT. IC201 V/C & DEF R1 L1 VIDEO V TV...

  • Page 15: Main Pwb

    AV-T2922 AV-T2922 CIRCUIT DIAGRAMS MAIN & FRONT CONTROL PWB CIRCUIT DIAGRAM NOTE 2SA1037AK/QR/-X MTZJ15A-T2 FRONT CONTROL PWB 2SC2412K/QR/-X DTC323TK-X IC701 DTA124EKA-X MTZJ15B-T2 PIC-37243SR SGA-4005A-R2 DTC124EKA-X REMOCON 1SS133-T2 BUS WIRE LIVE ISOLATED RECEIVER MTZJ9.1C-T2 QRSA08J-0R0YL Q701 Q702 2SA933AS/QR/-T 2SC1740S/QR/-T MTZJ5.6A-T2 NON-MOUNT(OPEN) POWER 4.9V SAFETY PARTS...
  • Page 16 AV-T2922 AV-T2922 MAIN & CRT SOCKET PWB CIRCUIT DIAGRAM DY001 (ITC) DEF YOKE CN0HV TP-91(B1) Q521 D R532 1200 Q522 2.2K 3WOMR C526 R546 R521 100/160 2SD2499-LB T521 2.2K QEZ0203-107 CE42034-002 H.OUT 3WOMR H-DRIVE TRANSF CN0B1 -0.1V TP-E T522 C524 .013 R525 QQH0115-001...
  • Page 17 AV-T2922 AV-T2922 PATTERN DIAGRAMS MAIN PWB PATTERN TP-E TP-91 (B1) D945 J001 W314 R964 TUNER Group No. D923 D927 W055 CKF0866- C694 C526 R926 R948 R963 C926 C928 R925 R951 W054 UL MARK W053 C001 C637 R546 R694 R683 C003 R950 C961 W713...
  • Page 18 ■ DIFFERENCE LIST ● USING PW BOARD (Page 30) Model AV-T2912(AR) AV-T2912/ZAR Remark PWB A’SSY MAIN PWB SGA-1009A-R2 SGA-1018A-R2 Not interchangeable ● EXPLODED VIEW PARTS LIST (page 30) Parts No. Ref. ! ! ! ! Parts Name Remark AV-T2912(AR) AV-T2912/ZAR...

  • Page 19: Table Of Contents

    AV- T2922 SERVICE MANUAL COLOR TELEVISION BASIC CHASSIS AV-T2922 CONTENTS ! SPECIFICATIONS ･････････････････ ･･････････ ･･･ ･･ ･･･ ･･････ ････ ･･････ ････ ･･････ 2 ･･･････ ･･････････ ･･････････ ･･ ･･･ ･･･････ ･･････････ ･･････････ ･･･ ･･ ･･･････ ･･････････ ･･････････ ･･ ･･･ ･･ ･･･ ･･ ････ ････ ･･ ････ ････ ･･ ･･ ･･･...

  • Page 20: Specifications

    AV-T2922 SPECIFICATIONS Items Content Dimensions (W× × × × H× × × × D) 29-5/8 ×23-1/4 ×20-5/8 / 75.2cm×59.0cm×52.2cm Mass 90.9Ibs / 41.3kg TV System and Color system TV RF System CCIR(M), CCT R(N) Color System PAL-M / PAL-N / NTSC Sound System BTSC (Multi Channel Sound) Picture Tube...

  • Page 21: Safety Precautions

    AV-T2922 SAFETY PRECAUTIONS 1. The design of this product contains special hardware, many 9. Isolation Check circuits and components specially for safety purposes. For (Safety for Electrical Shock Hazard) continued protection, no changes should be made to the original After re-ass embling the product, always perform an isolation design unless authorized in writing by the manufacturer.

  • Page 22: Features

    AV-T2922 FEATURES " The stable image proces sing circuit whic h is already acknowledged enables powerful image expression by the 29 inch big screen. " Multifunctional remote control permits picture adjustment. " With AUDIO / VIDEO input terminal. " Variable audio output terminal. "...

  • Page 23: Functions

    AV-T2922 FUNCTIONS FRONT CONTROL KEYS ① MENU / OPERATE ▼ key ② CHANNEL ― / ＋ or OPERATE keys ③ VOLUME ― / ＋ keys ④ POWER button ⑤ LED (indicator) Red ････ Power indication ① ① ① ① ② ② ② ② ③...

  • Page 24: Specific Service Instructions

    AV-T2922 SPECIFIC SERVICE INSTRUCTIONS DISASSEMBLY PROCEDURE CHECKING THE MAIN PW BOARD REMOVING THE REAR COVER To check the backs ide of the MAIN PW Board. 1. Unplug the power plug from AC outlet. 1) Pull out the chassis . (Refer to REMOVING THE CHASSIS). 2.
  • Page 25 AV-T2922 FRONT CABINET SPEAKER CRT SOCKET PWB (W ithin MAIN PWB) MAIN PWB FRONT CONTROL PWB CLAW SPEAKER CLAW REAR COVER POWER CORD Fig. 1 No. 51917...
  • Page 26 AV-T2922 MEMORY IC REPLACEMENT 1. Memory IC This model uses a memory IC. The memory IC stores data for proper operation of video/chroma and deflection circuits. When replacing, be sure to use the IC c ontaining initial setting data. 2. Memory IC replacement procedure SERVICE MENU PROCEDURE PICTURE...
  • Page 27 AV-T2922 VALUES OF SYSTEM CONSTANT (TABLE1) Setting item Setting content Setting value GAME HYPER SCAN SURROUND VIDEO VALUES OF USER SETTING ITEMS (TABLE2) Setting item Setting value Settings of switches on front panel and remote control unit MAIN POWER SUB POWER CHANNEL CH 02 CHANNEL PRESET...

  • Page 28: Replacement Of Chip Component

    AV-T2922 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 c hip part, melt the s older adequately. 4. Do not reuse a chip part after removing it. SOLDERING IRON 1.

  • Page 29: Service Adjustment

    AV-T2922 SERVICE ADJUSTMENT BEFORE STARTING SERVICE ADJUSTMENT 1. There ar e 2 way of adjusting this TV: One is with the 6. Never touch any adjustment parts, which ar e not specified REMOTE CONTROL UNIT and the other is the conventional in the list for this adjustment VRs, transfor ms, condenser s, method using adjustment parts and components.
  • Page 30 AV-T2922 ADJUSTMENT LOCATIONS FRONT FRONT CONTROL PWB CRT SOCKET PWB (Within MAIN PWB) (SOLDER SIDE) MENU VOLU ME CH ANNEL TP-R POWER TP-E( CR T EAR TH (BR AID ED ASS'Y) MAIN PWB FRONT IC 702 F901 IC 701 MEMOR Y T11 1 TUNER 1Pin : B1 (TP-91 )
  • Page 31 AV-T2922 BASIC OPERATION 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 adjustments.
  • Page 32 AV-T2922 (3) Method of Setting 1) MENU ▲ ▲ ▲ ▲ / ▼ ▼ ▼ ▼ key Select the setting item. Adjustment value Select item 2) MENU ― ― ― ― / ＋ ＋ ＋ ＋ key Setting the setting value of the setting item. When change the values, automatic ally stored in the memory.
  • Page 33 AV-T2922 SERVIC E MEN U (MAIN MEN U) PIC TU RE MODE SE RV ICE M ENU PI CTURE SOUND VI DE O S TATUS OTHERS LOW L IGHT HIGH LI GHT RF AFC CHK VCO (CW) 1. PI CTURE ** * ** * ** *...

  • Page 34: Initial Setting Value Of Service Menu

    AV-T2922 INITIAL SETTING VALUE OF SERVICE MENU 1. Ad justment of the SERVICE MENU is made on the basis of the initial setting values. However, the new setting values which set the screen in its optimum condition may differ from the initial setting. 2.
  • Page 35 AV-T2922 PICTURE MODE No . Setting (Adjustment) item Variable range Initial setting value V SIZE50 0～127 V S CR50 0～127 V LIN. 50 0～31 H POS. 60 0～31 H BLK. 60 0～7 V POS. 60 0～7 0 ～ 127 V SIZE60 V S CR60 0～127 0 ～...
  • Page 36 AV-T2922 OTHERS MODE No . Setting (Adjustment) item Variable range Initial setting value OSD POS. 0～31 LOCK DET 0 / 1 SD SEL. 0～2 H-CK SW 0 / 1 LOW LIGHT MODE Setting (Adjustment) item Variable range Initial setting value R CUTOFF 0～255 0 ～...

  • Page 37: Basic Adjustment

    AV-T2922 ADJUSTMENTS BASIC ADJUSTMENT Measuring Item Test point Ad justment item Description instrument Check of DC Voltmeter TP-91 1. Receive a black and white signal (color off). (NTSC) B1 POWER (B1 con nector 2. Connect the DC voltmeter to B1 c onnector 1 pin (TP-91) and SUPPLY 1 p in) TP-E(#) (B1 c onnector 3 pin).
  • Page 38 AV-T2922 Measuring Item Test point Ad justment part Description instrument Remote RF AGC No .60 RF AGC 1. Receive any broadc ast.. control unit Ad justment 2. Select “No.60 RF AGC” of the PICTURE MODE in SERVICE MENU. 3. Press the MUTING key and turn off the color. 4.
  • Page 39 AV-T2922 DEFLECTION CIRCUIT ADJUSTMENT The setting (adjustment) using the remote contr ol 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. Measuring Item Test point...
  • Page 40 AV-T2922 Measuring Item Test point Ad justment part Description instrument 60Hz Signal No .54 H POS.60 1. Receive a crosshatch signal. (NTSC or PAL-M) PAL-M or gener ator 2. Select the “No.54 H POS. 60” of the PICTURE mode in NT SC signal SERVICE MENU.
  • Page 41 AV-T2922 VIDEO / CHROMA CIRCUIT ADJUSTMENT The 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. Do no t change the initial setting values of the setting items not listed in “ADJUSTMENT”.
  • Page 42 AV-T2922 Measuring Item Test point Ad justment item Description instrument WHITE Signal G DRIVE 1. Receive the NTSC black and white s ignal (c olor off). BALANCE Generator B DRIVE 2. Select the HIGH LIGHT mode in the SERVICE MENU. (High Lig ht) 3.
  • Page 43 AV-T2922 Measuring Item Test point Ad justment item Description instrument SUB COLOR Remote [PAL-M] adjustment control unit No .3 COL . PALM 1. Receive a PAL-M broadcast. 2. Select “No.3 COL. PALM” of the PICTURE mode in SERVICE MENU. 3. Confirm the initial setting value of the “No.3 COL. PALM”. 4.

  • Page 44: Mts Circuit Adjustment

    AV-T2922 MTS CIRCUIT ADJUSTMENT Measuring Item Test point Ad justment part Description instrument MTS INPUT Remote No .2 IN LEVEL 1. Select the “No.2 IN LEVEL” of the SOUND mode in SERVICE LEVEL control unit MENU. check 2. Verify that the “No.2 IN LEVEL” is set at its initial setting value.

  • Page 45: Purity Adjustment

    AV-T2922 PURITY, CONVERGENCE PURITY ADJUSTMENT 1. Demagnetize CRT with the demagnetizer. W EDGE DEF LECT ION 2. Loosen the retainer screw of the deflec tion yoke. YOKE 3. Remove the wedges. CR T 4. Input a green raster signal from the signal generator, and turn the screen to green raster.
  • Page 46 AV-T2922 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) and turn them to magenta (red/blue). (F RONT VIEW ) 3. Using 6-pole convergence magnets, overlap the magenta (red/blue) and green lines in the c enter of the screen and turn them to white.
  • Page 47 AV-T2922 HOW TO CHECK THE HIGH VOLTAGE HOLD DOWN CIRCUIT 1. HIGH VOLT AGE HOLD DOWN CIRCUIT After repairing the high voltage hold down c ircuit as 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 switch on.
  • Page 48 AV-T2922 SELF CHECK FUNCTIONS 1. Outline This model has self check functions given below. When a malfunction has been detec ted, the SUB-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 c onnected to the microc omputer. 2.

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