JVC AV-20NX3 Service Manual Download Page 38 | Manualshive

Page: 38 / 39

background image

38

No. 52079

AV-20NX3

SERVICE NOTE :

«
...
36
37
38
39
»

Summary of Contents for AV-20NX3

Page 1: ... CHANNEL SCAN TV RM C1014 SYSTEM COLOUR SOUND MENU CHANNEL RETURN POWER DISPLAY TV VIDEO VOLUME 1 2 3 4 5 6 7 8 9 0 CINEMA SURROUND RM C1014 1H CONTENTS a SPECIFICATIONS 2 a OPERATING INSTRUCTIONS APPENDIX a SAFETY PRECAUTIONS 3 a FEATURES 4 a FUNCTIONS 5 a SPECIFIC SERVICE INSTRUCTIONS 6 a SERVICE ADJUSTMENTS 14 a STANDARD CIRCUIT DIAGRAM APPENDIX 2 1 a PARTS LIST 39 ...

Page 2: ...3 5MHz 4 5MHz Colour Sub Carrier Frequency PAL 4 43MHz SECAM 4 40625MHz 4 25MHz NTSC 3 58MHz 4 43MHz Aerial Input Terminal 75Ø Unbalanced Power Input AC110 240V 50 60Hz Power Consumption 95W Max 65W Avg Picture Tube Visible size 48cm measured diagonally High Voltage 26 5kV 1 5kV at cut off in service mode Speaker 5 X 12cm Oval type x 2 Audio Output 5W 5W Video Audio Input 1 2 3 Video 1 3 1Vp p 75Ø...

Page 3: ... alternatives approved by the manufacturer of the complete product 7 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 10kØ 2W resistor to the anode button 8 When service is required obs...

Page 4: ...NT input terminals s I 2 C bus control utilizes single chip ICs s By means of AUTO PROGRAM the TV stations can be selected automatically and the TV channels can also be rearranged auto matically s Built in DIGITAL ECO MODE ECONOMY ECOLOGY In accordance with the brightness in a room the brightness and or contrast of the picture can be adjusted automatically to make the optimum picture which is easy...

Page 5: ... IN VIDEO 3 V R L MONO IN VIDEO 3 MENU CHANNEL VOLUME EXIT MUTING OFF TIMER ECO SENSOR PICTURE MODE CHANNEL SCAN TV RM C1014 SYSTEM COLOUR SOUND MENU CHANNEL RETURN POWER DISPLAY TV VIDEO VOLUME 1 2 3 4 5 6 7 8 9 0 CINEMA SURROUND VIDEO 1 INPUT OUTPUT COMPONENT VIDEO 2 INPUT V MONO L V Y V L MONO L CB R R R CR FUNCTIONS a FRONT PANEL ...

Page 6: ...KER After removing the rear cover 1 Remove the 4 screws marked Î as shown in Fig 1 2 Follow the same steps when removing the other hand speaker CHECKING THE MAIN PW BOARD 1 To check the back side of the Main PWB 1 Pull out the Main PWB Refer to REMOVING THE MAIN PW BOARD 2 Erect the Main PWB vertically so that you can easily check its back side CAUTION Before turning on power make sure that the CR...

Page 7: ...No 52079 7 AV 20NX3 A B X6 X4 X4 D D FRONT CABINET PICTURE TUBE MAIN PWB CRT SOCKET PWB MAIN PWB REAR COVER SPEAKER SPEAKER C Fig 1 ...

Page 8: ...he CRT change table should preferably be smaller that the CRT sur face and its height be about 35cm COATING OF SILICON GREASE FOR ELECTRICAL IN SULATION 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 1 Wipe around the anode button with ...

Page 9: ... MENU key and set the correct value with the MENU T key 4 Press the DISPLAY key twice to return to the normal screen 5 Receive channel setting Refer to the OPERATING INSTRUCTIONS and set the receive channels channels preset NAME OF REMOTE CONTROL KEYS Fig 1 Fig 2 DISPLAY MENU PICTURE MODE MUTING OFF TIMER ECO SENSOR PICTURE MODE CHANNEL SCAN REVEAL SUBPAGE CANCEL TV TEXT HOLD RM C1010 INDEX STORE ...

Page 10: ...O YES NO YES NO MU MA YES NO YES NO YES NO SYSTEM COMB TILT TEXT SUPER BASS LANGUAGE MSP BILINGUAL B B SOUND TUNER COLOUR AUTO LOCK 1MHz 500KHz 250KHz 156 25KHz 31 25KHz 3D SURROUND 3CH VOL TONE AMP TUNER MULTI MU NO 040 040 000 240 040 030 030 NO NO NO ERCMI ERAPU NO E R C M I E R C E C E R C M I NO YES NO NO NO NO NO SETTING OF SYSTEM CONSTANT SET Table 1 ...

Page 11: ...E 15 2 TV VIDEO TV VNR OFF COMPRESS 16 9 OFF AUTO SHUTOFF OFF CHILD LOCK OFF BLUE BACK ON VIDEO 2 SET VIDEO LANGUAGE ENG 3D SURROUND OFF AI VOLUME ON ON SCREEN DISPLAY POSITION INDICATION COLOUR SYSTEM PAL SOUND SYSTEM B G PICTURE MODE VSM BRIGHT OFF TIMER 00 ECO SENSOR OFF BASS CENTRE TREBLE CENTRE BALANCE CENTRE USER SETTING VALUES Table 2 ...

Page 12: ... VSM PRESET 1 TINT BRIGHT STD SOFT 2 COLOUR 3 BRIGHT 4 CONT 5 SHARP Service menu Setting item SERVICE MENU SETTING ITEMS Service menu Setting item 5 PRESET 1 PSNS 2 ACL 3 MUS 4 MAT 5 FCO 6 BPS 7 IFLH 8 VID 9 STM 10 AFCW 11 VSW 12 FFI 13 AGC 14 CL 15 AKB 16 HBL 17 BKS 18 READ STATUS 19 VNR 20 PEAK 21 IVG 22 WPL 23 SOFT CLIPPER 24 IF PLL OFFSET 25 OVERSHOOT 26 HCO 27 HP2 28 AI VOLUME ADN 29 SUB BASS...

Page 13: ... Transistors diodes variable resistors etc 1 Apply extra solder to each lead 2 As shown in the figure push the part with tweezers and alter nately melt the solder at each lead Shift and remove the chip part Note After removing the part remove remaining solder from the pattern REPLACEMENT OF CHIP COMPONENT 2 How to install Chip parts Resistors capacitors etc 1 Apply solder to the pattern as indicat...

Page 14: ...it Setting item Setting value PICTURE MODE VSM BRIGHT VNR OFF BASS TREBLE BALANCE CENTRE TINT COLOUR BRIGHT SHARP CENTRE CONTRAST MAXIMUM MEASURING INSTRUMENT 1 DC voltmeter or Digital voltmeter 2 Oscilloscope 3 Signal generator Pattern generator PAL SECAM NTSC 4 Remote control unit ADJUSTMENT ITEMS B1 POWER SUPPLY FOCUS ADJUSTMENT IF CIRCUIT ADJUSTMENTS Adjustment of VCO CW Adjustment of DELAY PO...

Page 15: ...7G HV 4 1 GND B1 UPPER FOCUS F1 IC702 MAIN PWB ASS Y CRT SOCKET T 6 1 4 1 FRONT AV IN OUT HVT MAIN PWB ASS Y 1 6 1 1 4 5 S U LOWER SCREEN TU001 J770 S901 J773 S784 S782 S780 S783 S781 J772 J771 J804 J801 J802 J803 IC701 CN001 T PW DEG TP E S780 MENU S781 CH S782 CH S783 VOL S784 VOL POWER SW ...

Page 16: ...d select the SUB MENU SCREEN from the SERVICE MENU See Fig 1 on the next page SERVICE MENU SUB MENU 1 IF 2 VC 3 DEF 4 VSM PRESET 5 PRESET 6 PLUG PLAY ON 3 Method of Setting Once the setting values are set they are memorized automatically It must not adjust without inputting a signal 1 1 IF 1 VCO a 1 Key Select 1 IF b 1 Key Select 1 VCO c DISPLAY Key When this is pressed twice you will return to th...

Page 17: ...TE DISPLAY EXIT SUB MENU 3 DEF 50Hz PAL 1 CUTOFF R G V C PAL 1 VER SLOPE DEF 4 3 MENU 89 SELECT MENU OPERATE DISPLAY EXIT SUB MENU 5 PRESET PAL B G 1 PSNS PRESET 50Hz MENU 89 SELECT MENU OPERATE DISPLAY EXIT SUB MENU 4 VSM PRESET TINT COLOUR BRIGHT CONT SHARP STANDARD MENU 89 SELECT MENU OPERATE DISPLAY EXIT 1 PSNS 2 ACL 3 MUS 4 MAT 5 FCO 6 BPS 7 IFLH 8 VID 9 STM Setting item 10 AFCW 11 VSW 12 FFI...

Page 18: ...een gets darkened Adjustment of VCO CW VCO CW Item Measuring instrument Test point Adjustment part Description IF CIRCUIT ADJUSTMENTS Remote control unit Note Under normal conditions no adjustment is required 1 Select 1 IF from the SERVICE MENU 2 Select 1 VCO by pressing the 1 key on the remote control unit 3 Receive a broadcast signal 4 Check the characters colour of the BELOW REFERENCE displayed...

Page 19: ...ote control unit 4 Press the 1 key on the remote control unit to produce a single hori zontal line 5 Turn the SCREENVR fully counterclockwise then slowly turn it clock wise to where a red blue or green colour is faintly visible 6 Use the keys 4 and 7 or 5 and 8 on the remote control unit and adjust the other 2 colours to where the single horizontal line ap pears white 7 Turn the SCREENVR to where ...

Page 20: ...th the MENU key 4 Set the initial setting value with the MENU T key 5 If the contrast is not best with the initial setting value make fine adjustment until you get the best contrast 6 Press the DISPLAY key twice to return to the normal screen 4 CONT Adjustment of WHITE BALANCE High light Signal generator Remote control unit 2 DRIVE R DRIVE G DRIVE B Notes Proceed to the following adjustment after ...

Page 21: ...OLOUR 5 COLOUR Adjustment of SUB COLOUR II Signal generator Oscilloscope Remote control unit 5 COLOUR Method of adjustment using measuring instrument Notes Proceed to the following adjustment after having completed the ad justment of SUB CONT Set PICTURE MODE VSM to BRIGHT PAL COLOUR 1 Receive a PAL colour bar signal full field colour bar 75 white 2 Select 2 VC from the SERVICE MENU 3 Select 5 COL...

Page 22: ...TINT When adjustment is done for NTSC 3 58 TINT appropriate values are automatically set for NTSC 4 43 TINT Mg B 0V R Cy Y W B G Adjustment of SUB TINT II Signal generator Oscilloscope Remote control unit 6 TINT Method of adjustment using measuring instrument Notes Proceed to the following adjustment after having completed the adjustment of SUB CONT Set PICTURE MODE VSM to BRIGHT NTSC 3 58 TINT 1 ...

Page 23: ...ENU key 4 Set the initial setting value of 1 VER SLOPE with the MENU T key 5 Adjust 1 VER SLOPE to make A B with the MENU Tkey B A Blanking line Adjustment of V POSITION Signal generator Remote control unit 3 VER POSITION 6 Select 3 VER POSITION with the MENU key 7 Set the initial setting value of 3 VER POSITION with the MENU Tkey 8 Adjust 3 VER POSITION to make A B with the MENU Tkey to be contin...

Page 24: ...te control unit Adjustment of H POSITION 5 HOR POSITION 15 Receive a PAL circle pattern signal 16 Select 5 HOR POSITION with the MENU key 17 Set the initial setting value of 5 HOR POSITION with the MENU Tkey 18 Adjust 5 HOR POSITION to make C D with the MENU Tkey Signal generator Remote control unit Screen size 91 Picture size 100 C D Adjustment of H WIDTH 6 HOR WIDTH 19 Receive a PAL cross hatch ...

Page 25: ...EW TRAPEZ 26 Select 8 EW TRAPEZ with the MENU key 27 Set the initial setting value of 8 EW TRAPEZ with the MENU Tkey 28 Adjust 8 EW TRAPEZ so that the vertical lines at the left and right edges on the screen are in parallel Signal generator Remote control unit Adjustment of V S CURVE 4 VER SCURVE 29 Select 4 VER SCURVE with the MENU key 30 Set the initial setting value of 4 VER SCURVE with the MEN...

Page 26: ...orners on the screen are straight Signal generator Remote control unit Adjustment of H PARALLEL 11 HOR PARALL 37 Select 11 HOR PARALL with the MENU key 38 Set the initial setting value of 11 HOR PARALL with the MENU Tkey 39 Adjust 11 HOR PARALL to optimize the parallelogram distortion Signal generator Remote control unit Adjustment of H BOW 12 HOR BOW 40 Select 12 HOR BOW with the MENU key 41 Set ...

Page 27: ... Set the initial setting value of 7 EW PIN with the MENU Tkey 10 Adjust 7 EW PIN so that the first vertical lines at the left and right edges on the screen are straight 7 EW PIN Adjustment of CORNER Signal generator Remote control unit 11 Select 9 UP CORNER with the MENU key 12 Set the initial setting value of 9 UP CORNER with the MENU Tkey 13 Select 10 DW CORNER with the MENU key 14 Set the initi...

Page 28: ...lect 1 VER SLOPE with the MENU key 4 Set the initial setting value of 1 VER SLOPE with the MENU T key 5 Adjust 1 VER SLOPE to make A B with the MENU Tkey B A Blanking line Adjustment of V POSITION Signal generator Remote control unit 3 VER POSITION 6 Select 3 VER POSITION with the MENU key 7 Set the initial setting value of 3 VER POSITION with the MENU Tkey 8 Adjust 3 VER POSITION to make A B with...

Page 29: ...e control unit Adjustment of H POSITION 5 HOR POSITION 15 Receive a NTSC circle pattern signal 16 Select 5 HOR POSITION with the MENU key 17 Set the initial setting value of 5 HOR POSITION with the MENU Tkey 18 Adjust 5 HOR POSITION to make C D with the MENU Tkey Signal generator Remote control unit Screen size 91 Picture size 100 C D Adjustment of H WIDTH 6 HOR WIDTH 19 Receive a NTSC cross hatch...

Page 30: ...EW TRAPEZ 26 Select 8 EW TRAPEZ with the MENU key 27 Set the initial setting value of 8 EW TRAPEZ with the MENU Tkey 28 Adjust 8 EW TRAPEZ so that the vertical lines at the left and right edges on the screen are in parallel Signal generator Remote control unit Adjustment of V S CURVE 4 VER SCURVE 29 Select 4 VER SCURVE with the MENU key 30 Set the initial setting value of 4 VER SCURVE with the MEN...

Page 31: ...orners on the screen are straight Signal generator Remote control unit Adjustment of H PARALLEL 11 HOR PARALL 37 Select 11 HOR PARALL with the MENU key 38 Set the initial setting value of 11 HOR PARALL with the MENU Tkey 39 Adjust 11 HOR PARALL to optimize the parallelogram distortion Signal generator Remote control unit Adjustment of H BOW 12 HOR BOW 40 Select 12 HOR BOW with the MENU key 41 Set ...

Page 32: ...9 Set the initial setting value of 7 EW PIN with the MENU Tkey 10 Adjust 7 EW PIN so that the first vertical lines at the left and right edges on the screen are straight 7 EW PIN Adjustment of CORNER Signal generator Remote control unit 11 Select 9 UP CORNER with the MENU key 12 Set the initial setting value of 9 UP CORNER with the MENU Tkey 13 Select 10 DW CORNER with the MENU key 14 Set the init...

Page 33: ...ntrol unit C D VIDEO 2 SET COMPONENT fv 50 60Hz mode Setting of VSM PRESET 1 TINT 2 COLOUR 3 BRIGHT 4 CONT 5 SHARP Remote control unit 1 Select 4 VSM PRESET from the SERVICE MENU 2 Select BRIGHT with the PICTURE MODE key 3 Adjust the MENU key and MENU Tkey to reset the set values of 1 TINT 5 SHARP to the values shown in the table 4 Respectively select the VSM PRESET mode for SOFT and STAND ARD and...

Page 34: ... FCO 0 1 0 6 BPS 0 1 0 7 IFLH 0 1 0 8 VID 0 1 0 9 STM 0 1 0 10 AFCW 0 1 0 11 VSW 0 1 0 12 FFI 0 1 0 13 AGC 00 01 10 11 01 14 CL 50 95 83 15 AKB 0 1 0 16 HBL 0 1 0 17 BKS 0 1 1 18 READ STATUS 19 VNR 00 63 25 20 PEAK 0 3 1 21 IVG 0 1 1 22 WPL 0 F 5 23 SOFT CLIPPER 0 3 0 24 IF PLL OFFSET 0 63 32 25 OVERSHOOT 0 3 3 26 HCO 0 1 0 27 HP2 0 1 0 28 AI VOLUME 00 01 10 11 01 29 SUB BASS 3D 3 3 2 30 SUB TREBL...

Page 35: ...orizontally Fig 2 7 Adjust the gap between two lugs so that the GREEN RASTER will come into the centre of the screen Fig 3 8 Move the deflection yoke forward and fix the position of the deflec tion yoke so that the whole screen will become green 9 Insert the wedge to the top side of the deflection yoke so that it will not move 10 Input a crosshatch signal 11 Verify that the screen is horizontal 12...

Page 36: ...ergence DYNAMIC CONVERGENCE ADJUSTMENT 1 Move the deflection yoke up and down and overlap the lines in the periphery Fig 5 2 Move the deflection yoke left to right and overlap the lines in the periphery Fig 6 3 Repeat 1 and 2 above and make best convergence After adjustment fix the wedge at the original position Fasten the retainer screw of the deflection yoke Fix the P C magnets with glue RED RED...

Page 37: ...n over current on the low B line is detected Operation of CRT NECK protec tion circuit The main microcomputer detects the possible abnormality at 30 msec intervals and judges the results in every 16 time Of the 16 times if NG is detected more than 9 times it is judged that there is an abnormality DITTO When an abnormality has been detected the SUB POWER is turned off While the SUB POWER is being t...

Page 38: ...38 No 52079 AV 20NX3 SERVICE NOTE ...

Page 39: ...Printed in Japan 0211 WPC AV20NX3 H VICTOR COMPANY OF JAPAN LIMITED 12 3 chome Moriya cho Kanagawa ku Yokohama Kanagawa prefecture 221 8528 Japan HOME AV NETWORK BUSINESS UNIT 4 ...

Reviews:

No comments

Related manuals for AV-20NX3

Brand: HANNspree Pages: 51

Brand: Jensen Pages: 23

Brand: Samsung Pages: 324

Brand: Samsung Pages: 145

Brand: JVC Pages: 60

Brand: JVC Pages: 4

Brand: JVC Pages: 30

Brand: JVC Pages: 60

Brand: Samsung Pages: 2

Brand: Samsung Pages: 8

CRT Rear-Projection TV

Brand: Samsung Pages: 8

Brand: Samsung Pages: 40

Brand: Samsung Pages: 22

COLOURTELEVISION

Brand: Samsung Pages: 40

Brand: Samsung Pages: 48

Brand: Samsung Pages: 38

Brand: Samsung Pages: 53

Brand: Samsung Pages: 40

Brands by name

0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Popular brands

Load more brands