JVC AV-20F475S Service Manual Download Page 20 | Manualshive

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1-20 (No.YA052)

4.8

ADJUSTMENT PROCEDURE

4.8.1 CHECK ITEM

4.8.2 TUNER / IF CIRCUIT

4.8.3 FOCUS

Item

Measuring

instrument

Test point

Adjustment part

Description

B1 VOLTAGE

Signal
generator

DC voltmeter

TP-91(R927)
TP-E (IC421
Heatsink)
[MAIN PWB]

(1) Receive the black and white signal. (color off)
(2) Connect the DC voltmeter to the TP-E and TP-91.
(3) Confirm that the voltage is DC134V±2V.

HIGH VOLTAGE
HOLD DOWN

Resistor X

connector

1-pin
3-pin
[MAIN PWB]

• After reparing the high voltage hold down circuit. This

circuit shall be checked to operate correctly.

(1) Turn the power switch to on.
(2) Refer to the figure, connect the resistor between X

connector 1-pin and 3-pin.

(3) Make sure that the screen picture disappeares.
(4) Disconnect the power plug.
(5) Remove the resistor.
(6) Again connect the power plug.
(7) Turn the power switch to on.
(8) Make sure that the normal picture is displayed on the

screen.

T521

RESISTOR

HEATER

X CONNECTOR

3

2

1

4

18.0 k 1%

Item

Measuring

instrument

Test point

Adjustment part

Description

IF VCO

Remote
control unit

[9.VCO]

CW transf. (T111)
[MAIN PWB]

• It must not adjust without inputting the RF signal.

(1) Receive any broadcast.
(2) Select 9.VCO from the SERVICE MODE.
(3) Change the "AFC" to "OFF" and "FINE" to "0".
(4) Confirm that the color change from "TOO HIGH" to

"TOO LOW" by CW transf. on MAIN PWB, and
check the "SYNC" is "YES".

(5) Adjust CW transf. until "GOOD" letters turns green.

And then confirm that the "SYNC" is "YES" again.
Adjustment can be done in this statement.

(6) It return the "AFC" to "ON".
(7) Push the [EXIT] key to exit the 9.VCO.

TOO HIGH GOOD TOO LOW

SYNC: YES
AFC ON
FINE 0

AFC STATUS
(Turn to green)

Item

Measuring

instrument

Test point

Adjustment part

Description

FOCUS

Signal
generator

FOCUS VR
[In HVT]

(1) Receive the cross-hatch 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 when the

screen gets darkened.

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Summary of Contents for AV-20F475S

Page 1: ...MPANY OF JAPAN LIMITED No YA052 2004 4 COLOR TELEVISION YA052 2004 4 AV 20F475 S AV N21F45 S TABLE OF CONTENTS 1 PRECAUTION 1 3 2 SPECIFIC SERVICE INSTRUCTIONS 1 4 3 DISASSEMBLY 1 6 4 ADJUSTMENT 1 11 5 TROUBLESHOOTING 1 26 BASIC CHASSIS FJ2 ...

Page 2: ...ency Video IF Sound IF 45 75 MHz 41 25 MHz 4 5MHz Color Sub Carrier 3 58 MHz Power Input AC120V 60Hz Power Consumption 85W Picture Tube 20 51cm Measured diagonally full square H 30 5cm W 40 6cm High Voltage 26 0kV 1 3kV at zero beam current Speaker 6 5cm 13cm 2 1 2 5 Oval type 2 Audio Power Output 3W 3W Antenna Terminal VHF UHF F type connector 75Ω unbalanced coaxial 1 Video Audio input INPUT 1 2 ...

Page 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 dre...

Page 4: ...ears direct without deteriorating the signal from DVD MTS STEREO The voice multiplex function of the MTS system is built in MTS Multi channel TV Sound system RETURN PLUS You can program a specific 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 HYPER SURROUND Creates...

Page 5: ... O AGC muting for tuner when channel select Muting H 38 YC_Vcc I 5V for video process circuit 11 uP_VVss GND 39 R_OUT O R signal 12 TV_HGND GND 40 G_OUT O G signal 13 FBP_SCP I Flyback pulse H pulse 41 B_OUT O B signal 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_AGND GND 17 Vsaw V saw f...

Page 6: ...PEAKER HOLDER 3 Follow the same steps when remove the other hand SPEAKER 3 1 4 CHECKING THE MAIN PWB To check the PW Board from back side 1 Pull out the MAIN PWB refer to REMOVING THE MAIN PWB 2 Erect the MAIN PWB vertically with the HVT side facing up so that you can easily check the back side of the MAIN PWB CAUTION When erecting the MAIN PWB be careful so that there will be no contacting with o...

Page 7: ... No YA052 1 7 Fig 1 CRT SOCKET PWB MAIN PWB PWB STOPPER FRONT CABINET B A E C D SPEAKER SPACER SPEAKER HOLDER HVT REAR COVER POWER CORD ...

Page 8: ...e do not agree refer to the OPERATING INSTRUCTIONS 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 S47 2 DEF D Deflection setting Adjust D01 D33 3 SOUND A Audio setting Adj...

Page 9: ...IDEO STATUS DYNAMIC ASPECT 4 3 HYPER SORROUND OFF Setting item Setting position TINT 0 COLOR 0 PICTURE 8 BRIGHT 0 DETAIL 8 COLOR TEMPERRATURE HIGH NOISE MUTING ON Setting item Setting position BASS Center TREBLE Center BALANCE Center MTS STEREO SMART SOUND OFF Setting item Setting position SET CLOCK OFF ON OFF TIMER OFF WORLD CLOCK Refer to OPERATING INSTRUCTIONS AV 20F475 Setting item Setting pos...

Page 10: ...he 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 in...

Page 11: ... 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 Remote control unit 4 4 ADJUSTMENT ITEMS CHECK ITEM B1 V...

Page 12: ...SPEAKER F901 R927 IC201 IC421 IC702 IC851 TUNER DOWN UP HVT FUSE DEG TP E TP B S401 T111 T521 V CENTER SW CW PW HV S T T U E1 C U X UPPER FOCUS TP E GND TP 91 B1 LOWER SCREEN MAIN PWB CRT SOCKET PWB FRONT TOP CRT EARTH BRAIDED ASS Y SOLDER SIDE 1 3 1 X RAY 2 GND 3 X RAY ...

Page 13: ...IGHT 5 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 8 HIGH LIGHT TOO HIGH GOOD TOO LOW SYNC YES AFC ON FINE 0 ...

Page 14: ...W 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 5 3L Y C LYC This sets the setting values of the 3 line YC separation ...

Page 15: ...tored automatically when release the REMOTE CONTROL UNIT keys 8 HIGH LIGHT The settings for HIGH LIGHT is described in the WHITE BALANCE page of ADJUSTMENT PROCEDURE NOTE The setting value will be stored automatically when release the REMOTE CONTROL UNIT keys 9 VCO The setting for VCO is described in the IF VCO page of ADJUSTMENT PROCEDURE RF Antenna input COMP External Component input EXT Externa...

Page 16: ...D STANDARD 4 3 16 9 4 3 4 3 S01 BRIGHT 0 127 64 S02 PICTURE 0 127 65 S03 COLOR 0 127 41 44 S04 TINT 0 127 67 62 S05 DETAIL 0 63 30 35 40 S06 BRIGHT 32 32 0 0 3 2 S07 PICT 32 32 0 0 7 0 S08 COLOR 32 32 0 3 1 S09 TINT 32 32 0 6 6 S10 DETAIL 32 32 3 No Setting item Variable range Initial setting value RF EXTERNAL S COMPOSITE EXTERNAL COMPONENT STANDARD THEATER STANDARD THEATER LOW HIGH LOW HIGH LOW H...

Page 17: ...Setting item Variable range Initial setting value S29 RGB MUTE 0 1 0 S30 BLUE B 0 1 1 S31 VIDEO SW 0 3 3 S32 CMP ABCL 0 1 0 S33 OSD ABL 0 1 0 S34 OSD CONT 0 63 6 S35 SUB CONT 0 15 8 S36 ABL GAIN 0 3 0 S37 ABL PNT 0 3 3 S38 Y GAMMA 0 3 1 S39 Y MUTE 0 1 0 S40 SVM GAIN 0 3 3 S41 SVM PH 0 3 0 S42 WPL 0 1 0 S43 COL GMM 0 1 0 S44 V1 GAIN 0 7 4 S45 VMOFF DE 128 127 0 S46 APC CLK 0 1 1 S47 PIP ADJ 0 15 0 ...

Page 18: ... CENT 128 127 0 D11 V S CORR 0 15 4 4 D12 V S CO 128 127 0 D13 V LIN 0 15 11 11 D14 V LIN 128 127 0 D15 H SIZE 0 63 32 32 D16 H SIZE 128 127 0 D17 WVMT TOP 0 3 0 2 0 D18 WVMT BTM 0 3 0 2 0 D19 EWCR TOP 0 31 16 16 D20 EWCR T 128 127 0 D21 EWCR BTM 0 31 16 16 D22 EWCR B 128 127 0 D23 EW PARA 0 63 26 26 D24 EW PAR 128 127 0 D25 V EHT 0 7 0 0 D26 V EHT 128 127 0 D27 H EHT 0 7 0 0 D28 H EHT 128 127 0 D...

Page 19: ...28 127 16 F16 VM DAT E 0 1 0 F17 XDSID TM 0 255 15 F18 FM TRAP 0 1 0 No Setting item Variable range Initial setting value LYC01 MODE 0 7 4 LYC02 VENH 0 7 1 LYC03 PDSOFF 0 1 0 LYC04 CB 0 1 0 LYC05 VNLR 0 15 2 LYC06 GSEL0 0 1 0 LYC07 GSEL1 0 1 1 LYC08 COR 0 3 0 LYC09 TRAP 0 1 1 LYC10 CHTRAP 0 1 0 LYC11 CBPF 0 1 0 LYC12 ENHOFF 0 1 0 No Setting item Variable range Initial setting value AV 20F475 AV N2...

Page 20: ...e screen T521 RESISTOR HEATER X CONNECTOR 3 2 1 4 18 0 k 1 Item Measuring instrument Test point Adjustment part Description IF VCO Remote control unit 9 VCO CW transf T111 MAIN PWB It must not adjust without inputting the RF signal 1 Receive any broadcast 2 Select 9 VCO from the SERVICE MODE 3 Change the AFC to OFF and FINE to 0 4 Confirm that the color change from TOO HIGH to TOO LOW by CW transf...

Page 21: ... CENTER SW NOTE Bottom is to be located within 85 95 range When vertical linearity is not even adjust vertical linearity by D13 V LIN and D11 VS CORR V SIZE V POSITION 16 9 Signal generator Remote control unit 2 DEF D D08 V SIZE D14 V LIN V SIZE V POSITION 4 3 adjustment should be finished 1 Receive the black and white signal color off 2 Select 16 9 mode 3 Confirm that the width of V BLANKING is e...

Page 22: ...19 EWCR TOP and 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 PAR D20 EWCR T D22 EWCR B V SIZE V POSITION adjustment should be finished H SIZE H POSITION SIDE PIN adjustment should be finished Regular size 4 3 1 Receive the cross hatch signal 2 Select 16 9 mode 3 Confirm both sides of cross hatch to be the adjustment value 90...

Page 23: ... appear until the single horizontal line that is displayed becomes white using the 4 9 keys 12 Turn the SCREEN VR until the single horizontal line is displayed faintly 13 Press the 2 key to cancel the single horizontal line mode 14 Return to the main menu in the SERVICE MODE 15 Select the 1 V C S from the SERVICE MODE 16 Adjust the BRIGHT level to become the black component shines white slightly b...

Page 24: ...m the SERVICE MODE 4 Select S01 BRIGHT 5 Set the initial setting value of the S01 6 If the brightness is not the best with the initial setting value make fine adjustment of the S01 until you get the optimum brightness SUB CONTRAST Remote control unit 1 V C S S02 PICTURE 1 Receive any broadcast 2 Set the VIDEO STATUS to STANDARD 3 Select the 1 V C S from the SERVICE MODE 4 Select S02 PICTURE 5 Set ...

Page 25: ... 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 300Hz signal 3 Select the 3 SOUND A from the SERVICE MODE 4 Select the A02 LOW SEP 5 Set the initial setting value of the 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 pi...

Page 26: ...1 26 No YA052 SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING ...

Page 27: ...2 WPC Printed in Japan JVC SERVICE ENGINEERING COMPANY OF AMERICA DIVISION OF JVC AMERICAS CORP www jvcservice com US Only JVC CANADA INC Head office 21 Finchdene Square Scarborough Ontario M1X 1A7 416 293 1311 ...

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