JVC AV-20N3 Service Manual Download Page 26

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No. 52025

AV-20N3

AV-20NMG3

AV-20NMG3B

Item

Measuring

instrument

Test point

Ad justment part

Description

7.SECAM
BL ADJUST

[Method of adjustment using measuring instrument]

Ad justment
of SECAM
BL ACK
OFFSET

Remote
control unit

Signal
generator

1. Input a SECAM full field c olour bar signal.
2. Enter the SERVICE MENU.
3. Select

2. V/C

from SERVICE MENU.

4. Select

7. SECAM BL ADJUST

with

▼

▲

MENU key.

5. Set the initial setting value with the – or + MENU key.
6. Switch the

①

key (c olour OFF) and

②

key (c olour ON) on the

remote control and make sure that there is no colour on the
blac k and white screen.

7. If the black and white s creen is not bes t with the initial setting

value, make fine adjustment until you get the best black and
white screen.

8. While watching the screen, adjust the value to be the same

colour between ON & OFF by ten key on the remote c ontrol
unit.

9. Press the DISPLAY key twice to return to the normal screen.

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

COLOUR

OFF

Summary of Contents for AV-20N3

Page 1: ...V 20NMG3 AV 20NMG3B AV 20NMG3 A CONTENTS SPECIFICATIONS 2 SAFETY PRECAUTIONS 3 FEATURES 4 FUNCTIONS 5 MAIN DIFFERENCE LIST 7 SPECIFIC SERVICE INSTRUCTIONS 8 SERVICE ADJUSTMENTS 15 PARTS LIST 33 OPERATING INSTRUCTIONS STANDARD CIRCUIT DIAGRAM 2 1 SERVICE MANUAL COLOUR TELEVISION BASIC CHASSIS CG RM C364GY RM C364 ...

Page 2: ...er 38 0MHz Intermediate Frequency SIF Carrier 32 5MHz 5 5MHz 31 5MHz 6 5MHz 32 0MHz 6 0MHz 32 5MHz 5 5MHz 33 5MHz 4 5MHz 31 5MHz 6 5MHz 32 0MHz 6 0MHz Colour Sub Carrier Frequency PAL 4 43MHz SECAM 4 40625MHz 4 25MHz NTSC 3 58MHz 4 43MHz Power Input Rated Voltage AC110 240V 50 60Hz Power Consumption 90W Max 60W Avg Speaker 5cm 12 cm Oval type 2 Audio Output 3W monaural Aerial Input Terminal 75Ω Un...

Page 3: ...ements or 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 10kΩ 2W resistor to the anode button 8 When service is req...

Page 4: ...I2 C bus control utilizes single chip ICs for IF V C DEF VSM PRESET PRESET SETUP TOUR By means of AUTO PROGRAM the TV stations can be selected automatically and the TV channels can also be rearranged automatically Built in ECO MODE ECONOMY ECOLOGY In accordance with the brightness in a room the brightness and of contrast of the picture can be adjusted automatically to make the optimum picture whic...

Page 5: ... buttons VOLUME buttons AI ECO sensor REMOTE CONTROL sensor ON TIMER lamp POWER lamp MAIN POWER button A V INPUT terminal HEADPHONE jack 1 2 3 4 5 6 7 8 9 10 10 9 1 2 3 4 5 6 7 8 ANT Terminal VIDEO INPUT Terminal VIDEO OUTPUT Terminal AUDIO INPUT Terminal AUDIO OUT PUT Terminal 1 2 3 4 5 2 3 4 5 1 ...

Page 6: ...ons ECO SENSOR key SOUND SYSTEM key COLOUR SYSTEM key TV VIDEO key OFF TIMER key CHANNEL SCAN key RETURN key DISPLAY key CHANNEL key POWER key PICTURE MODE key Number CH key key MUTING key MENU key MENU key MENU key VOLUME key RM C364GY AV 20N3 AV 20N3 D AV 20NMG3 AV 20NMG3 A RM C364 AV 20NMG3B 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ...

Page 7: ... LC20413 002B H Part Name Model Name Picture Tube Inst Book Digest Manual AV 20N3 A48LWX10X LCT1188 001A H LCT1189 001A H AV 20N3 D AV 20NMG3 A48LDD095X LCT1196 001A H LCT1197 001A H AV 20NMG3B AV 20NMG3 A Item Model Name TV RF System Colour System RF Mode Intermediate Frequency SIF Carrier OSD Language AV 20N3 B G I D K PAL SECAM 32 5MHz 5 5MHz 31 5MHz 6 5MHz 32 0MHz 6 0MHz E R AV 20N3 D E C M I ...

Page 8: ...gure remove the 2screws marked 2 Follow the same steps when removing the other hand speaker CHECKING THE MAIN PW BOARD 1 To check the back side of the PW Board 1 Pull out the MAIN PW Board Refer to REMOVING THE MAIN PW Board 2 Erect the PW Board vertically so that you can easily check the back side of the PW Board CAUTION When erecting the PW Board be careful so that there will be no contacting wi...

Page 9: ...No 52025 AV 20N3 AV 20NMG3 AV 20NMG3B 9 CRT SOCKET PWB FRONT CABI POWER CORD SPEAKER SPEAKER MAIN PWB C C REAR COVER B A 2 1 6 2 ...

Page 10: ...setting item with the MENU key and set the correct value with the MENU key 5 Press the DISPLAY key twice and return to the normal screen 5 Receive channel of setting Refer to the OPERATING INSTRUCTIONS and set the receive channels channels preset as described 6 User Setting Check the user setting value of Table 2 and if setting value is different set the correct value For setting refer to the OPER...

Page 11: ...S TEXT TABLE CYL VOLUM PW M POS Table 1 USER SETTING VALUES Setting item Setting value Setting item Setting value SUB POWER ON LANGUAGE ENGLISH CHANNEL POSITION 1 POSITION CHANNEL PRESET Refer to OPERATING INSTRUCTION VOLUME About 10 AI ECO SENSOR OFF TV VIDEO TV VNR OFF ON SCREEN DISPLAY POSITION INDICATION AUTO SHUTOFF OFF COLOUR SYSTEM PAL ON TIMER PR1 0 00 SOUND SYSTEM B G BLUE BACK OFF OFF TI...

Page 12: ... BLUE 128 127 50 RED 2 DRIVE BLUE 128 127 0 3 BRIGHT 127 127 0 4 CONT 63 63 0 5 COLOUR 63 63 0 TV 0 0 AV 20N3 AV 20N3 D 0 2 6 TINT VIDEO AV 20NMG3 AV 20NMG3B AV 20NMG3 A 63 63 8 2 7 SECAM BL ADJ 31 31 0 TV 8 Fixed 8 SHARP Do Not Adj VIDEO 32 31 15 Fixed 3 DEFLECTION Initial setting value Setting item Variable range fv 50Hz MODE fv 60Hz MODE 1 VER POSITION 04 03 2 3 2 HOR POSITION 16 15 1 4 3 VER H...

Page 13: ... 0 3 ABL 1 1 1 1 4 GAMMA 0 0 0 0 TV 0 2 2 3 5 Y DELAY TIME VIDEO 0 2 0 2 6 BLACK EXP START 3 3 3 3 TV 1 1 0 0 7 C BPF VIDEO 1 1 1 1 8 CW SCP 0 0 0 0 9 VIF DET LEVEL 0 0 0 0 11 IF AGC MIN 0 0 0 0 12 VIF AGC 0 0 0 0 13 VIF PMOD 0 0 0 0 19 VNR 15 15 15 15 20 RGB LIM 1 1 1 1 21 RGB LIMIT LEVEL 2 2 2 2 23 TEXT H POSITION 3 3 3 3 24 READ DATA Sound System Do Not Adjust Setting item B G I D K M 10 SIF DE...

Page 14: ... 3 While pressing MENU button and VOL button ON the FRONT CABINET simultaneously turn the POW ER ON When the POWER is turned ON the data is written in the micro computer immediately LOCATIONS OF FRONT PANEL BUTTONS AND LAM PS MENU buttons CHANNEL buttons MENU buttons VOLUME buttons MENU buttons AI ECO sensor REMOTE CONTROL sensor ON TIMER lamp POWER lamp MAIN POW ER button MENU buttons CHANNEL but...

Page 15: ...ecified prepare the most suitable reception or input signal for adjustment 6 Never touch any adjustment parts which are not specified in the list for this adjustment VRs transforms condensers etc 7 Preparation for adjustment Unless otherwise specified in the adjustment instructions preset the following functions with the REMOTE CONTROL UNIT User mode position PICTURE MODE VSM BRIGHT VNR OFF TINT C...

Page 16: ...Do not adjust 6 SETUP TOUR OFF It should be able to select mode LANGUAGE and AUTO CH PRESET Should be OFF Key operation of the SERVICE MENU Enter to SERVICE MENU Press the DISPLAY key and the PICTURE MODE key of the REMOTE CONTROL UNIT simultaneously Then enter the SERVICE MENU mode as shown in Fig 1 Exit from SERVICE MENU When complete the adjustment work press the DISPLAY key to return to the SE...

Page 17: ...e setting items DISPLAYKey When this is pressed twice you will return to the SERVICE MENU 2 V C 3 DEF and 4 VSM PRESET 2 4Key Select one from 2 V C 3 DEF and 4 VSM PRESET MENU Key Select setting items MENU Key Adjust the values of the items DISPLAY Key When this is pressed return to the SERVICE MENU 6 SETUP TOUR Bypressing the 6 key you can change the ON or OFF should be OFF Should be OFF If it is...

Page 18: ...AGCTAKE OVER OPERATE DISP EXIT 6 SETUP TOUR ON OFF By pressing 6 key BRIGHT TINT COLOUR BRIGHT CONT SHARP OPERATE DISP EXIT SUB MENU 4 VSM PRESET SELECT DEF OPERATE DISP EXIT SUB MENU 3 DEF SELECT 50Hz 1 VER POSITION PAL V C PAL 1 CUTOFF OPERATE DISP EXIT R G B 50Hz SUB MENU 2 V C SELECT PRESET 1 C TRAP FIX OPERATE DISP EXIT 50Hz SUB MENU 5 PRESET SELECT B G PAL SERVICE MENU 1 IF 2 V C 3 DEF 4 VSM...

Page 19: ...ONS S 1Pin TP 91 B1 2Pin NC 3Pin X ray1 4Pin X ray2 5Pin TP E HVT S1 HV U IC301 MEMORY IC IC702 IC701 F9 01 DEG TU001 FRONT TOP MAIN PWB CRT SOCKET PWB SOLDER SIDE TP 47G R E1 U T PW UPPER FOCUS LOWER SCREEN TP 47R G TP 47B TP E T CRT EARTH WIRE BRAIDED ASS Y ...

Page 20: ...ription Please use signal generator which is correct proof about the sending frequency Adjustment of VCO CW Signal generator Remote control unit 1 VCO 1 Input the PAL full colour bar 210 25MHz signal 2 Enter the SERVICE MENU 3 Select 1 IF from the SERVICE MENU 4 Press 1 key and select 1 VCO 5 Select VCO ADJUST with MENU key 6 Press MENU key until the colour of the characters TOO HIGH changes blue ...

Page 21: ... MENU 4 Select 2 DELAY POINT by pressing the 2 key on the remote control unit 5 Set the setting values of the setting items as shown bellow table 6 Then adjust the MENU or key until video noise disappears 7 Turn to other channels and make sure that there are no irregularities Setting Item Variable range Initial setting value MATSUSHITA QAU0287 001 MURATA QAU0185 004 ALPS QAU0282 001 NTSC 3 58 45 4...

Page 22: ...unit and adjust the other 2 colours which except the appeared colour to where the single horizontal line appears white 8 Turn the SCREEN VR to where the single horizontal line glows faintly 9 Press the 2 key to turn off the single horizontal line 10 Press the DISPLAY key twice to return to the normal screen Adjustment of WHITE BALANCE High light Signal generator Remote control unit 2 DRIVE R DRIVE...

Page 23: ...y 6 If the contrast is not the best with the initial set value make fine adjustment until you get the best contrast 5 COLOUR Method of adjustment without measuring instrument PAL COLOUR 1 Receive a PAL broadcast 2 Enter the SERVICE MENU 3 Select 2 V C from the SERVICE MENU 4 Select 5 COLOUR with the MENU key 5 Set the initial setting value for PAL COLOUR with the MENU key 6 If the colour is not th...

Page 24: ...ENU or key 3 Adjust SECAM COLOUR to bring the value of A in the illustration to the voltage as shown given billow Voltage difference between W and G NTSC 3 58 COLOUR 1 Input a NTSC 3 58 full field colour bar signal 75 white 2 Set the initial setting value of NTSC 3 58 COLOUR with the MENU key 3 Adjust NTSC 3 58 COLOUR to bring the value of A in the illustration to the voltage as shown given billow...

Page 25: ...e automatically set at the respective values 6 TINT Method of adjustment using measuring instrument NTSC 3 58 TINT 1 Input a NTSC 3 58 full field colour bar signal 75 white 2 Enter the SERVICE MENU 3 Select 2 V C from SERVICE MENU 4 Select 6 TINT with the MENU key 5 Set the initial setting value of NTSC 3 58 with the MENU key 6 Connect the oscilloscope between TP 47G R and TP E 7 Adjust NTSC 3 58 ...

Page 26: ...5 Set the initial setting value with the or MENU key 6 Switch the key colour OFF and key colour ON on the remote control and make sure that there is no colour on the black and white screen 7 If the black and white screen is not best with the initial setting value make fine adjustment until you get the best black and white screen 8 While watching the screen adjust the value to be the same colour be...

Page 27: ...NU 3 Select 3 DEF from SERVICE MENU 4 Select 1 VER POSITION with the MENU key 5 Set the initial setting value with the MENU key 6 Adjust V and V to be equal with the MENU key as shown in Fig 2 7 Input a cross hatch signal 8 Select 3 V HEIGHT with the MENU key 9 Set the initial setting value with the MENU key 10 As shown in Fig 1 adjust VER HEIGHT and make the vertical screen size 92 of the picture...

Page 28: ...t is properly done on the screen of 60Hz mode NOTE Adjust to make both 50Hz 60Hz are the same v size and fine straight line When adjust again adjust 50Hz mode first When adjust in 60Hz mode only 60Hz mode is adjust VSM PRESET SETTING Item Measuring instrument Test point Adjustment part Description Setting of VSM PRESET Remote control unit TINT COLOUR BRIGHT CONT SHARP 1 Enter the SERVICE MENU 2 Se...

Page 29: ...ill come into the center of the screen Fig 3 8 Move the deflection yoke forward and fix the position of the deflection 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 Input red and blue raster signals and make sure that purity is properly adjust...

Page 30: ...bove and make best convergence DYNAMIC CONVERGENCE ADJUSTMENT 1 Move the deflection yoke up and down and overlap the lines in the periphery Fig 2 2 Move the deflection yoke left to right and overlap the lines in the periphery Fig 3 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 6 magn...

Page 31: ...th 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 32: ...No 52025 AV 20N3 AV 20NMG3 AV 20NMG3B 32 ...

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