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1-26 (No.YA243)

4.8.5 MTS CIRCUIT

SUB
CONTRAST

Remote
control unit

[1.V/C (S)]
S02: PICTURE

(1) Receive any broadcast.
(2) Select the

1.V/C (S)

from the SERVICE MODE.

(3) Select

< S02 >

(PICTURE).

(4) Set the initial setting value of

< S02 >

(5) If the contrast is not the best with the initial setting

value, make fine adjustment of the

< S02 >

until you

get the optimum contrast.

Item

Measuring

instrument

Test point

Adjustment part

Description

Item

Measuring

instrument

Test point

Adjustment part

Description

MTS INPUT
LEVEL

Remote
control unit

[3.SOUND (A)]
A01: IN LEVEL

(1) Receive any broadcast.
(2) Select the

3.SOUND (A)

from the SERVICE MODE.

(3) Select the

< A01 >

(IN LEVEL).

(4) Set the initial setting value of

< A01 >

MTS
SEPARATION

TV audio
multiplex
signal
generator

Oscilloscope

Remote
control unit

R OUT
L OUT
[AUDIO OUT]

[3.SOUND (A)]
A02: LOW SEP.
A03: HI SEP.

(1) Input the stereo L signal (300 Hz) from the TV audio

multiplex signal generator to the antenna terminal.

(2) Connect an oscilloscope to R OUT pin of the AUDIO

OUT, and display one cycle portion of the 300 Hz
signal.

(3) Select the

3.SOUND (A)

from the SERVICE MODE.

(4) Select the

< A02 >

(LOW SEP.).

(5) Set the initial setting value of

< A02 >

(6) Adjust the

< A02 >

so that the stroke element of the

300Hz signal will become minimum.

(7) Change the connection of the oscilloscope to L OUT

pin of the AUDIO OUT, and enlarge the voltage axis.

(8) Change the signal to 3 kHz, and similarly adjust

< A03 >

(HI SEP.).

L-Channel
signal waveform

R-Channel
crosstalk portion

Minimum

1 cycle

Содержание I'Art AV-27F476

Страница 1: ...an Limited No YA243 2005 2 COLOR TELEVISION YA243 2005 2 AV 27F476 R AV 27F476 S AV 32F476 Y AV 32F476 Z TABLE OF CONTENTS 1 PRECAUTION 1 3 2 SPECIFIC SERVICE INSTRUCTIONS 1 4 3 DISASSEMBLY 1 6 4 ADJUSTMENT 1 12 5 TROUBLESHOOTING 1 27 BASIC CHASSIS GJ5 ...

Страница 2: ...ended for your TV set Intermediate Frequency Video IF Sound IF 45 75 MHz 41 25 MHz 4 5 MHz Color Sub Carrier 3 58 MHz Power Input AC120 V 60 Hz Power Consumption 140 W 160 W Picture Tube Visible size 68 cm 29 Measured diagonally H 55 4 cm V 41 8 cm 80 cm 34 Measured diagonally H 65 6 cm V 49 6 cm High Voltage 30 0 kV 1 3 kV at Zero beam current 31 4 kV 1 3 kV at Zero beam current Speaker 6 5 cm 13...

Страница 3: ... the manufacturer of the complete product 8 Do not check high voltage by drawing an arc Use a high voltage meter or a high voltage probe with a VTVM Discharge the picture tube before attempting meter connection by connecting a clip lead to the ground frame and connecting the other end of the lead through a 10kΩ 2W resistor to the anode button 9 When service is required observe the original lead dr...

Страница 4: ...c channel to return to while scanning through the channels using the CH and CH keys VIDEO INPUT LABEL This function is used to label video input connections for the onscreen displays WORLD CLOCK The world clock feature provides time differences for some of the major cities around the world in real time BBE High definition audio adds natural clear and extraordinary sound quality to any program HYPE...

Страница 5: ...al for CRT output 13 FBP_SCP I Flyback pulse H pulse 41 B_OUT O B signal for CRT output 14 HOUT O H drive oscillation 42 RGB_Vcc I 9V for RGB process circuit 15 H_Vcc I 9V for H oscillation start 43 IK_IN I Not used 16 HAFC_1 H AFC filter 44 TV_DGND GND 17 Vsaw V saw filter 45 uP_AGND GND 18 VOUT O V drive 46 uP_AVdd 5V 19 EW_OUT O Parabola waveform for sidepin correection 47 MAIN_POWER O Power on...

Страница 6: ...hen remove the upper one 3 1 5 REMOVING THE LED POWER SW PWB Remove the REAR COVER 1 Remove the 2 screws E 2 Withdraw the LED POWER SW PWB toward you If necessary remove the wire clamp connector etc 3 1 6 REMOVING THE FRONT CONTROL PWB Remove the REAR COVER 1 Remove the 2 screws F 2 Withdraw the FRONT CONTROL PWB toward you If necessary remove the wire clamp connector etc 3 1 7 CHECKING THE CHASSI...

Страница 7: ... No YA243 1 7 Fig 1 REAR COVER FRONT CONTROL PWB CRT SOCKET PWB LED POWER SW PWB SPEAKER SPEAKER HOLDER FRONT CABINET Claw Claw AV SELECTOR PWB MAIN PWB AV TERMINAL BOARD POWER CORD C F B A E D ...

Страница 8: ...ting steps The CRT change table should preferably be smaller that the CRT surface and its height be about 35cm Fig 2 Fig 3 Fig 4 COATING OF SILICON GREASE FOR ELECTRICAL INSULATION ON THE CRT ANODE CAP SECTION Subsequent to replacement of the CRT and HV transformer or repair of the anode cap etc by dismounting them be sure to coat silicon grease for electrical insulation as shown in Fig 5 Wipe aro...

Страница 9: ...ere these do not agree refer to the OPERATING INSTRUCTIONS USER S GUIDE and set the items as described 6 SERVICE MODE setting Verify what to set in the SERVICE MODE and set whatever is necessary Fig 1 Refer to the SERVICE ADJUSTMENT for setting 3 2 2 SERVICE MODE SETTING ITEMS Fig 1 Setting items Settings Item No 1 V C S Video setting Adjust S01 S48 2 DEF D Deflection setting Adjust D01 D33 3 SOUN...

Страница 10: ... CH 02 VOLUME 10 MUTING OFF DISPLAY OFF SLEEP TIMER OFF THEATER PRO OFF VIDEO STATUS DYNAMIC ASPECT 4 3 SOUND HYPER SURROND OFF BBE ON Setting item Setting position TINT 0 COLOR 0 PICTURE 8 BRIGHT 0 DETAIL 8 COLOR TEMPERATURE HIGH NOISE MUTING ON VSM ON Setting item Setting position BASS 0 TREBLE 0 BALANCE 0 MTS STEREO SMART SOUND OFF Setting item Setting position SET CLOCK OFF ON OFF TIMER OFF Se...

Страница 11: ...the tweezers and remove the chip part Transistors diodes variable resistors etc 1 Apply extra solder to each lead 2 As shown in the figure push the part with tweezers and alternately melt the solder at each lead Shift and remove the chip part NOTE After removing the part remove remaining solder from the pattern 2 How to install Chip parts Resistors capacitors etc 1 Apply solder to the pattern as i...

Страница 12: ...sformers and condensers not shown in the adjustment items of this service adjustment 4 2 PRESET SETTING BEFORE ADJUSTMENTS Unless otherwise specified in the adjustment items preset the following functions with the REMOTE CONTROL UNIT 4 3 MEASURING INSTRUMENT AND FIXTURES DC voltmeter or digital voltmeter Oscilloscope Signal generator Pattern generator NTSC TV audio multiplex signal generator Remot...

Страница 13: ...WER SCREEN S421 DOWN UP IC201 CN004 MAIN PWB PW F901 DEG MEMORY IC TUNER 5A V CENTER SW V CENTER SW FRONT TOP CRT SOCKET PWB SOLDER SIDE LED POWER SW PWB FRONT CONTROL PWB FRONT FRONT CN6007 CN6006 1 TP E 2 X RAY2 3 X RAY1 4 NC 5 TP 91 CN5006 CN005 CN3004 CN3005 1 5 SPEAKER POWER CORD POWER SW POWER LED DEF YOKE DEG COIL TP R TP B TP E ...

Страница 14: ... 3L Y C LYC Fixed value LYC01 1 V C S 2 DEF D 3 SOUND A 4 OTHERS F 5 3L Y C LYC 7 LOW LIGHT 8 HIGH LIGHT 9 VCO 11 I2C BUS 12 SYSTEM SYS SELECT BY OPERATE BY EXIT BY EXIT SERVICE MENU BRIGHT 7 LOW LIGHT SUB MENU MAIN MENU 12 SYSTEM SYS Fixed value SYS01 VIDEO IN 11 I2C BUS Fixed value I2C BUS ON 9 VCO Fixed value 8 HIGH LIGHT TOO HIGH GOOD TOO LOW SYNC YES AFC ON FINE 0 ...

Страница 15: ...6 5 HOW TO EXIT THE SERVICE MODE Press the EXIT key to exit the SERVICE MODE 1 V C S This sets the setting values of the VIDEO circuit 2 DEF D This sets the setting values of the DEFLECTION circuit 3 SOUND A This sets the setting values of the AUDIO circuit 4 OTHERS F This sets the setting values of the factory settings Do not adjust 6 3L Y C LYC This sets the setting values of the 3 line YC separ...

Страница 16: ...for WHITE BALANCE LOW LIGHT control circuit NOTE The setting value will be stored automatically when release the REMOTE CONTROL UNIT keys 8 HIGH LIGHT The settings for WHITE BALANCE HIGH LIGHT control circuit NOTE The setting value will be stored automatically when release the REMOTE CONTROL UNIT keys RF Antenna input COMP External Component input EXT External S Composite input 4 3 4 3 screen mode...

Страница 17: ...S RF EXTERNAL S COMPOSITE EXTERNAL COMPONENT STANDARD THEATER STANDARD STANDARD 4 3 16 9 4 3 4 3 4 3 S01 BRIGHT 0 127 64 S02 PICTURE 0 127 55 S03 COLOR 0 127 48 48 S04 TINT 0 127 50 72 S05 DETAIL 0 63 35 40 40 S06 BRIGHT 32 32 0 1 4 4 S07 PICT 32 32 8 7 3 3 S08 COLOR 32 32 0 3 3 S09 TINT 32 32 0 3 14 S10 DETAIL 32 32 0 No Setting item Variable range Initial setting value AV 32F476 Y RF EXTERNAL S ...

Страница 18: ...PONENT STANDARD THEATER STANDARD THEATER LOW HIGH LOW HIGH LOW HIGH LOW HIGH S11 R CUT OFF 0 255 30 S12 G CUT OFF 0 255 30 S13 B CUT OFF 0 255 30 S14 R DRIVE 0 127 64 S15 B DRIVE 0 127 64 S16 R CUT 128 127 0 0 0 5 S17 G CUT 128 127 0 0 0 0 S18 B CUT 128 127 0 0 0 6 S19 R DRV 128 127 5 13 7 0 S20 B DRV 128 127 6 25 9 0 S21 NTSC MAT 0 3 3 3 1 1 2 2 1 1 S22 BLACK ST 0 3 2 2 S23 DC REST 0 1 1 1 S24 DC...

Страница 19: ...iable range Initial setting value RF EXTERNAL S COMPOSITE EXTERNAL COMPONENT S25 ASSY SHRP 0 7 4 4 4 S26 BPF FO 0 1 0 0 S27 KILR OFF 0 1 0 0 S28 KILR SEN 0 1 1 1 No Setting item Variable range Initial setting value AV 27F476 R AV 27F476 S AV 32F476 Y AV 32F476 Z S29 RGB MUTE 0 1 0 0 S30 BLUE B 0 1 0 0 S31 VIDEO SW 0 3 3 3 S32 CMP ABCL 0 1 0 0 S33 OSD ABL 0 1 0 0 S34 OSD CONT 0 63 7 8 S35 SUB CONT ...

Страница 20: ...28 127 0 0 0 D11 V S CORR 0 15 7 7 9 9 8 8 D12 V S CO 128 127 0 0 0 D13 V LIN 0 15 10 10 10 10 8 8 D14 V LIN 128 127 0 0 0 D15 H SIZE 0 63 38 38 49 49 28 28 D16 H SIZE 128 127 0 0 0 D17 WVMT TOP 0 3 0 1 0 0 1 0 0 1 0 D18 WVMT BTM 0 3 0 1 0 0 1 0 0 1 0 D19 EWCR TOP 0 31 14 14 14 14 11 11 D20 EWCR T 128 127 0 0 0 D21 EWCR BTM 0 31 13 13 16 16 11 11 D22 EWCR B 128 127 0 0 0 D23 EW PARA 0 63 42 42 35 ...

Страница 21: ...value AV 27F476 R AV 27F476 S AV 32F476 Y AV 32F476 Z F01 OSD POSI 0 255 39 39 42 42 F02 OSD FREQ 0 255 90 90 90 90 F03 CCD POSI 0 255 42 42 48 48 F04 CCD FREQ 0 255 91 91 93 93 F05 CCD CONT 0 63 4 4 4 4 F06 PUR WBCK 0 1 0 0 0 0 F07 PUR CONT 0 63 2 2 2 2 F08 CCD PCHK 0 1 1 1 1 1 F09 VMOFF 0 1 0 0 0 0 F10 VNR CHK 0 255 3 3 3 3 F11 VCSN TM 0 255 5 5 5 5 F12 VM DAT A 128 127 8 127 8 8 F13 VM DAT B 12...

Страница 22: ...C12 ENHOFF 0 1 0 No Setting item Variable range Initial setting value SYS01 VIDEO IN 0 4 3 SYS02 VSM 0 1 1 SYS03 CLR TEMP 0 1 1 SYS04 THEATER 0 1 1 SYS05 THEA PRO 0 1 1 SYS06 GAME MD 0 1 0 SYS07 AHS 0 1 0 SYS08 HYPER SR 0 1 1 SYS09 BBE 0 1 1 SYS10 S SOUND 0 1 1 SYS11 16 9 MD 0 3 1 SYS12 S CCD 0 1 1 SYS13 ID DISP 0 1 1 SYS14 CH LAB 0 1 1 SYS15 V LAB 0 1 1 SYS16 W CLOCK 0 1 1 SYS17 PIM 0 1 1 SYS18 P...

Страница 23: ...s displayed on the screen HVT HEATER 4 CONNECTOR RESISTOR S1 3 2 1 B1 4 5 Item Measuring instrument Test point Adjustment part Description FOCUS Signal generator FOCUS VR In HVT 1 Receive the crosshatch signal 2 While watching at the screen adjust the FOCUS VR to the vertical and horizontal lines will be thinnest and sharpest center horizontal line 3 Make sure that the picture is in focus even whe...

Страница 24: ...al line at both side to become straight 9 If it is necessary readjust step 3 to 8 NOTE If it is not straight at the vertical upper and bottom corner line adjust the upper and bottom conrner pin by D19 EWCR TOP amd D21 EWCR BTM H POSITION H SIZE SIDE PIN 16 9 Signal generator Remote control unit 2 DEF D D16 H SIZE D04 H POSI D24 EW PARA D20 EWCR T D22 EWCR B V SIZE V POSITION adjustment should be f...

Страница 25: ...e the black component shines white slightly by S01 15 Confirm that whether the color ingredient of R G or B is visible to the black component which shines white slightly 16 When the color ingredient can be seen two colors other than a visible color are adjusted and it is made to look white 17 Return the value of S01 to initial setting value The 3 EXIT key is the cancel key for the WHITE BALANCE WH...

Страница 26: ... LEVEL 4 Set the initial setting value of A01 MTS SEPARATION TV audio multiplex signal generator Oscilloscope Remote control unit R OUT L OUT AUDIO OUT 3 SOUND A A02 LOW SEP A03 HI SEP 1 Input the stereo L signal 300 Hz from the TV audio multiplex signal generator to the antenna terminal 2 Connect an oscilloscope to R OUT pin of the AUDIO OUT and display one cycle portion of the 300 Hz signal 3 Se...

Страница 27: ... No YA243 1 27 SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING ...

Страница 28: ... No YA243 AV MULTIMEDIA COMPANY VIDEO DISPLAY CATEGORY 12 3 chome Moriya cho kanagawa ku Yokohama kanagawa prefecture 221 8528 Japan Victor Company of Japan Limited VPT Printed in Japan ...

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