JVC AV-21PM Service Manual Download Page 28

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No. 56055

AV-21PM

CTH 0008
CRT

AV21PM-H #3

VICTOR COMPANY OF JAPAN, LIMITED
TELEVISION RECEIVER DIVISION 1106 Heta, Iwai-city, Ibaraki-prefecture, 306-0698, Japan

Summary of Contents for AV-21PM

Page 1: ... 21PM AV 21PM COPYRIGHT 2000 VICTOR COMPANY OF JAPAN LTD No 56055 Aug 2000 CONTENTS SPECIFICATIONS 2 SAFETY PRECAUTIONS 3 FEATURES 4 OPERATING INSTRUCTIONS APPENDED 1 1 SPECIFIC SERVICE INSTRUCTIONS 4 SERVICE ADJUSTMENTS 10 STANDARD CIRCUIT DIAGRAM APPENDED 2 1 PARTS LIST 28 ...

Page 2: ...er 32 0MHz 6 0MHz 32 5MHz 5 5MHz 33 5MHz 4 5MHz Colour Sub Carrier Frequency PAL 4 43MHz SECAM 4 40625MHz 4 25MHz NTSC 3 58MHz 4 43MHz Aerial Input Terminal 75Ω Unbalanced Power Input AC110 240V 50 60Hz Power Consumption 116W Max 74W Avg Picture Tube Visible size 51cm measured diagonally High Voltage 28 0kV 1 5kV at zero beam current Speaker 5cm 12cm Oval type 2 Audio Output 5W Monaural Input Vide...

Page 3: ...ical to those used in the original circuits Service should be performed by qualified personnel only 2 Alterations of the design or circuitry of the products should not be made Any design alterations or additions will void the manufacturer s warranty and will further relieve the manufac turer of responsibility for personal injury or property damage resulting therefrom 3 Many electrical and mechanic...

Page 4: ...MOVING THE SPEAKER After removing the rear cover 1 Remove the Speaker block by removing the 2 screws marked E See Fig 2 2 Remove the Speaker by removing the 4 screws marked F See Fig 2 3 Follow the same steps for removing the other hand speaker CHECKING THE MAIN PW BOARD To check the back side of the Main PW Board follow the next steps 1 Pull out the PB Base Refer to REMOVING THE PB BASE 2 Erect t...

Page 5: ...AV 21PM No 56055 5 Fig 2 CRT SOCKET PWB FRONT CABINET FRONT CONTROL PWB CONTROL BASE CLAW CLAW MAIN PWB PB BASE F 4 SPEAKER E 2 Fig 1 E 2 4 F SPEAKER REAR COVER A 7 B ...

Page 6: ... same as those indicated in Table 1 If the value is different select the setting item with the MENU a key and set the correct value with the MENU 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 6 User setting Check the user setting values in ...

Page 7: ...O MINT MQSS YES NO 10 20 40 80 YES NO YES NO YES NO Setting item Setting value Setting item Setting value SUB POWER ON PICTURE MODE VSM BRIGHT CHANNEL POSITION 1 POSITION VNR OFF OFF TIMER OFF LANGUAGE ENGLISH VOLUME Appropriate sound volume AUTO SHUTOFF OFF TV VIDEO TV ECO SENSOR OFF ON SCREEN DISPLAY POSITION NUMBER DISPLAY BLUE BACK OFF COLOUR SYSTEM AUTO PAL ON TIMER PR1 0 00 SOUND SYSTEM B G ...

Page 8: ...R ON OFF Should be set to OFF When you turn the TV power off the Turbo Timer is automatically set to OFF Service menu Setting item 1 IF 1 VCO 2 DELAY POINT 2 V C 1 CUTOFF R G B 2 DRIVE R B 3 BRIGHT 4 CONT 5 COLOUR P S N3 N4 6 TINT N3 N4 7 SECAM BL ADJ 8 SHARP TV VIDEO 3 DEF 1 VER POSITION 2 HOR POSITION 3 VER HEIGHT 4 VER LINEARITY 5 VER SCURVE 6 HOR VCO ADJUST 7 HOR WIDTH 8 EW PIN 9 EW CORNER 10 ...

Page 9: ...sistors diodes variable resistors etc 1 Apply extra solder to each lead 2 As shown in the figure while pushing the chip part with twee zers alternately melt the solder at its each lead Then 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 patt...

Page 10: ...is the conventional method using adjustment parts and components 2 The setting 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 con dition can be different from the initial setting values 3 Make sure that connection is correctly made toAC power source 4 Turn on the power of the TV and measuring ins...

Page 11: ...2 DELAY POINT a 1 Key Select 1 IF b 2 Key Select 2 DELAY POINT c MENU Key Adjust the setting value d DISPLAY Key When this is pressed twice you will return to the SERVICE MENU 2 2 V C 3 DEF 4 VSM PRESET and 5 PRESET Note Do not adjust 4 VSM PRESET and 5 PRESET unless you had changed its value by mistake a 2 5 Keys Select one from 2 V C 3 DEF 4 VSM PRESET and 5 PRESET b MENU a key Select setting it...

Page 12: ...2 V C OPERATE DISP EXIT a SELECT DEF SUB MENU 3 DEF 1 VER POSITION 50Hz 60Hz Setting item 1 IF 3 DEF 5 PRESET 6 TURBO TIMER OFF 2 V C 4 VSM PRESET SERVICE MENU 1 6 SELECT DISP EXIT 6 TURBO TIMER TURBO TIMER OFF ON 50Hz 50Hz BRIGHT SUB MENU 4 VSM PRESET a SELECT OPERATE DISP EXIT TINT COLOUR BRIGHT CONT SHARP PRESET PAL SUB MENU 5 PRESET a SELECT OPERATE DISP EXIT 1 C TRAP FIX 50Hz B G BRIGHT STD S...

Page 13: ... E TP 47G E CRT EARTH BRAIDED ASS Y TOP F901 PW DEG FRONT CONTROL PWB FRONT POWER SW SL SR 1 Pin TP 91 B1 2 Pin NC 3 Pin X RAY1 4 Pin X RAY2 5 Pin TP E MAIN PWB IC702 MEMORY IC IC701 TUNER W HV FRONT AV IN OUT HVT S1 S1 IC301 U P 1 5 CN002 CN003 W MICRO PROCESSOR CN002 CN003 ...

Page 14: ... CW of VCO CW control unit Description Under normal conditions no adjustment is required Note Do not adjust without inputting signal 1 Receive a colour bar signal 2 Select 1 IF from the SERVICE MENU 3 Press the 1 key to select 1 VCO 4 Select VCO ADJUST with the MENU a key and make sure that the setup value shown in the screen is 00 5 Press the MENU or key until the colour of the characters TOO HIG...

Page 15: ...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 not change the initial setting values of the setting adjustment items not listed in ADJUSTMENT SUB MENU 2 V C Variable Initial setting range value Setting Adjustment Item DELAY POINT AGC TAKE OVER NTSC3 58...

Page 16: ... single horizontal line appears white 7 Turn the SCREEN VR to where the single horizontal line glows faintly 8 Press the 2 key to return to 1 CUTOFF screen 9 Press the DISPLAY key twice to return to the normal screen 1 Receive a black and white signal colour off 2 Select 2 V C from the SERVICE MENU 3 Select 2 DRIVE R B with MENU a key and set each value to initial setting value with 4 and 7 keys o...

Page 17: ...U or key 5 If the contrast is not the best with the initial set value make fine adjustment until you get the best contrast 6 Press the DISPLAY key twice to return to the normal screen Method of adjustment without measuring instrument PAL COLOUR 1 Receive a PAL broadcast 2 Select 2 V C from the SERVICE MENU 3 Select 5 COLOUR with the MENU a key 4 Set the initial setting value for PAL COLOUR with th...

Page 18: ...U or key 3 Adjust SECAM COLOUR to set the value A in the figure to 13V W G NTSC 3 58 COLOUR 1 Receive 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 or key 3 Adjust NTSC 3 58 COLOUR to set the value A in the figure to 8V W G NTSC 4 43 COLOUR When adjustment is done for NTSC 3 58 COLOUR appropriate values are automatically set for...

Page 19: ...e figure to 5V W Cy 7 Press the DISPLAY key twice to return to the normal screen NTSC 4 43 TINT When adjustment is done for NTSC 3 58 TINT appropriate val ues are automatically set for NTSC 4 43 TINT Method of adjustment without measuring instrument 1 Receive a SECAM HALF COLOUR BAR signal 210 25MHz 2 Select 2 V C from the SERVICE MENU 3 Select 7 SECAM BL ADJUST with the MENU a key 4 Set the initi...

Page 20: ...t 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 SUB MENU 3 DEF H H V V Initial setting value Setting item Adjustment name Variable range 50Hz 60Hz 1 VER POSITION Vertical center 4 3 2 2 2 HOR POSITION Horizontal center 16 15 1 1 3 VER HEIGHT Vertic...

Page 21: ...ize with the MENU key 10 Receive a circle pattern signal 11 Select 2 HOR POSITION with the MENU a key 12 Set the initial setting value of 2 HOR POSITION with the MENU key 13 Adjust HOR POSITION to make H H with the MENU key 14 Receive a cross hatch signal 15 Select 7 HOR WIDTH with the MENU a key 16 Set the initial setting value of 7 HOR WIDTH with the MENU key 17 Adjust HOR WIDTH and make the hor...

Page 22: ...rallel When the vertical linearity has been deteriorated remark ably perform the following steps 24 Receive a cross hatch signal 25 Select 4 VER LINEARITY with the MENU a key 26 Set the initial setting value of 4 VER LINEARITY with the MENU key 27 Select 5 VER SCURVE with the MENU a key 28 Set the initial setting value of 5 VER SCURVE with the MENU key 29 Adjust VER LINEARITY and VER SCURVE so tha...

Page 23: ...t BRIGHT with the PICTURE MODE key 3 Adjust the MENU a key and MENU or key to reset the set values of TINT SHARP to the values shown in the table 4 Respectively select the VSM PRESET mode for SOFT and STANDARD and make similar adjustment as in 3 above 5 Press the DISPLAY key twice to return to the normal screen Do not adjust BRIGHT SUB MENU 4 VSM PRESET a SELECT OPERATE DISP EXIT TINT COLOUR BRIGH...

Page 24: ... 12 V IF AGC 0 b b b 13 V IF PMOD 0 b b b 19 VNR 15 b b b 20 RGB LIM 1 b b b 21 RGB LIMIT LEVEL 2 b b b 23 TEXT H POSITION 5 b b b 24 READ DATA PRESET ADJUSTMENT No adjustment is necessary Adjust only when you had changed the value by miss operation SUB MENU 5 PRESET Do not adjust TV RF system Initial setting value Setting item B G I D K M 10 S IF DET LEVEL 0 b b b 14 S IF BPF BW ADJUST 0 b b b 15...

Page 25: ... green raster signal from the signal generator and turn the screen to green raster 5 Move the deflection yoke backward 6 Bring the long lug of the purity magnets on the short lug and position them horizontally Fig 2 7 Adjust the gap between two lugs so that the green raster will come into the center of the screen Fig 3 8 Move the deflection yoke forward and fix the position of the deflection yoke ...

Page 26: ...nta red blue 3 Using 6 pole convergence magnets overlap the magenta red blue and green lines in the center of the screen to turn them to white 4 Repeat 2 and 3 above and make best convergence DYNAMIC CONVERGENCE ADJUSTMENT 1 Move the deflection yoke up and down and overlap the lines in the center Fig 2 2 Move the deflection yoke left to right and overlap the lines in the periphery Fig 3 3 Repeat 1...

Page 27: ...rrent and CRT NECK protection At 0 24 second intervals After about 3 seconds Power on Start of detection Detection of an abnormality SUB POWER OFF Flashing LEDs Check item Over current protection CRT NECK protection Details of detection An over current on the low B line is detected Operation of CRT NECK protec tion circuit Method of detection The main microcomputer detects the possible abnormality...

Page 28: ...No 56055 40 AV 21PM CTH 0008 CRT AV21PM H 3 VICTOR COMPANY OF JAPAN LIMITED TELEVISION RECEIVER DIVISION 1106 Heta Iwai city Ibaraki prefecture 306 0698 Japan ...

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