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JVC AV-21L41, Service Manual

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JVC AV-21L41 Service Manual Download Page 10

No. 51859

AV-21L41

13

REPLACEMENT OF IC301 (IF V/C DECODER)

"

 

For the IC301(IF V/C DECODER) of this model, all data are written in the micro-computer. So, write the data in the micro-

computer in accordance with the following procedures before starting adjustment.

REPLACING PROCEDURES

(1) 

Turn the POWER OFF.

(2) 

Replace the IC301 with a new one.

(3) 

While pressing MENU button and VOL+ button ON the FRONT Panel simultaneously, turn the POWER ON. When the POWER is turned

ON, the data is written in the micro-computer immediately.

LOCATIONS OF FRONT PANEL BUTTONS AND LAMPS

1 

MENU buttons

2 

CHANNEL 

∨

/

∧

 buttons

    

(MENU 

∨

/

∧

 buttons)

3 

VOLUME 

－

/

＋

 buttons

    

(MENU 

－

/

＋

 buttons)

4 

ECO sensor

5 

REMOTE CONTROL sensor

6 

ON TIMER lamp

7 

POWER lamp

8 

MAIN POWER button

1

8

2

3

4

5

6

7

Summary of Contents for AV-21L41

Page 1: ...AN LTD AV 21L41 BK CONTENTS SPECIFICATIONS 2 SAFETY PRECAUTIONS 3 FEATURES 4 FUNCTIONS 5 SPECIFIC SERVICE INSTRUCTIONS 7 SERVICE ADJUSTMENTS 14 PARTS LIST 31 OPERATING INSTRUCTIONS STANDARD CIRCUIT DIAGRAM 2 1 SERVICE MANUAL COLOUR FLAT TELEVISION BASIC CHASSIS CG F ...

Page 2: ...lour Sub Carrier Frequency PAL 4 43MHz SECAM 4 40625MHz 4 25MHz NTSC 3 58MHz 4 43MHz AC110 240V 50 60Hz Power Input Rated Voltage Operating Voltage AC90 260V 50 60Hz Power Consumption 105W Max 68W Avg Picture Tube Visible size 51cm measured diagonally High Voltage 26 5kV 1 5kV at zero beam current Speaker 5cm 12 cm Oval type 2 Audio Output 5W monaural Bilingual Aerial Input Terminal 75Ω Unbalanced...

Page 3: ...Cs for IF V C DEF VSM PRESET PRESET TURBO TIMER By means of AUTO PROGRAM the TV stations can be selected automatically and the TV channels can also be rearranged automatically The sound system has a built in A2 bilingual system Built in AI ECO ECONOMY ECOLOGY sensor In accordance with the brightness in a room the brightness and of contrast of the picture can be adjusted automatically to make the o...

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

Page 5: ...T RM C365 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 Ⅰ Ⅱ key ...

Page 6: ... 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 OPERATING INSTRU...

Page 7: ...ing value Setting item Setting value MAIN POWER SW OFF PICTURE MODE VSM BRIGHT SUB POWER ON LANGUAGE THAI CHANNEL POSITION 1 POSITION CHANNEL PRESET Refer to OPERATING INSTRUCTION VOLUME About 10 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 TIMER OFF shown 00 CHILD LOCK OFF BILINGUAL...

Page 8: ...EN 1 CUT OFF 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 0 TV 0 0 MU 6 TINT VIDEO 63 63 8 0 7 SECAM BL ADJ 31 31 0 TV 7 Fixed 8 SHARP Do Not Adj VIDEO 32 31 15 Fixed 9 AMP T SHARP 12 3 DEFLECTION Initial setting value Setting item Variable range fv 50Hz MODE fv 60Hz MODE 1 VER POSITION 04 03 1 3 2 HOR POSITION 16 15 3 3 3 VER HEIGHT 64 63 35 1 4 VE...

Page 9: ... 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 DET LEVEL 0 ...

Page 10: ...PROCEDURES 1 Turn the POWER OFF 2 Replace the IC301 with a new one 3 While pressing MENU button and VOL button ON the FRONT Panel simultaneously turn the POWER ON When the POWER is turned ON the data is written in the micro computer immediately LOCATIONS OF FRONT PANEL BUTTONS AND LAMPS 1 MENU buttons 2 CHANNEL buttons MENU buttons 3 VOLUME buttons MENU buttons 4 ECO sensor 5 REMOTE CONTROL sensor...

Page 11: ...epare 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 COLOUR BRIGHT CO...

Page 12: ...VSM Video Status Memory 5 PRESET Adjustment of the RF circuit Do not adjust 6 TURBO TIMER For quick setting the TIMER count value adjustable not only by minuets but also by second 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 ...

Page 13: ...ms DISPLAY Key When this is pressed 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 Adjust the values of the items DISPLAY Key When this is pressed return to the SERVICE MENU 6 TURBO TIMER By pressing the 6 key you can change the ON or OFF should be OFF Should be OFF If it is ON the timer in TIM...

Page 14: ... OVER OPERATE DISP EXIT 6 TURBO TIMER ON OFF By pressing 6 key SERVICE MENU 1 IF 2 V C 3 DEF 4 VSM PRESET 5 PRESET 6 TURBO TIMER OFF 1 6 SELECT DISP EXIT OFF V C PAL 1 CUTOFF OPERATE DISP EXIT R G B 50Hz SUB MENU 2 V C SELECT DEF OPERATE DISP EXIT SUB MENU 3 DEF SELECT 50Hz 1 VER POSITION PAL PRESET 1 C TRAP FIX OPERATE DISP EXIT 50Hz SUB MENU 5 PRESET SELECT B G PAL BRIGHT TINT COLOUR BRIGHT CONT...

Page 15: ...in X ray2 5Pin TP E HVT S1 HV U IC301 MEMORY IC IC702 IC701 F901 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 A V INPUT Headphone ANT Terminal A V IN OUTPUT Terminal POWER SW ...

Page 16: ... Description 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 Select 1 IF from the SERVICE MENU 3 Press 1 key and select 1 VCO 4 Select VCO ADJUST with MENU key 5 Press MENU key until the colour of the characters TOO HIGH changes blue to yellow Then gradu...

Page 17: ... the SERVICE MENU 3 Select 2 DELAY POINT by pressing the 2 key on the remote control unit 4 Set the setting values of the setting items as shown bellow tabbe 5 Then adjust the MENU or key until video noise disappears 6 Turn to other channels and make sure that there are no irregularities Setting Item Variable range Initial setting value MU NTSC 3 58 48 DELAY POINT AGC TAKE OVER OTHER 0 127 43 DELA...

Page 18: ...t and adjust the other 2 colours which except the appeared colour to where the single horizontal line appears white 7 Turn the SCREEN VR to where the single horizontal line glows faintly 8 Press the 2 key to turn off the single horizontal line 9 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 B 1...

Page 19: ...s 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 Select 2 V C from the SERVICE MENU 3 Select 5 COLOUR with the MENU key 4 Set the initial setting value for PAL COLOUR with the MENU or key 5 If the colour is not the best with the initial set value make fine...

Page 20: ...nput a SECAM full field colour bar signal 75 white 2 Set the initial setting value of SECAM COLOUR with the MENU or key 3 Adjust SECAM COLOUR to bring the value of A in the illustration to 6V W G Voltage value 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 or key 3 Adjust NTSC 3 58 COLOUR ...

Page 21: ...3 TINT When NTSC 3 58 is set NTSC 4 43 will be 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 Select 2 V C from SERVICE MENU 3 Select 6 TINT with the MENU key 4 Set the initial setting value of NTSC 3 58 with the MENU or key 5 Connect the oscilloscope between TP 47G R and T...

Page 22: ...ing value with the or MENU key 5 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 6 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 7 While watching the screen adjust the value to be the same colour between ON OFF by ten ke...

Page 23: ...rom SERVICE MENU 3 Select 1 VER POSITION with the MENU key 4 Set the initial setting value with the MENU key 5 Adjust V and V to be equal with the MENU key as shown in Fig 2 6 Input a cross hatch signal 7 Select 3 V HEIGHT with the MENU key 8 Set the initial setting value with the MENU key 9 As shown in Fig 1 adjust VER HEIGHT and make the vertical screen size 92 of the picture size with the MENU ...

Page 24: ...nt 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 Select 4 VSM PRESET from t...

Page 25: ...he 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 adjusted P PURITY MAGNET 4 4 POLES ...

Page 26: ... the deflection yoke Fix the 6 magnets with glue DYNAMIC periphery CONVERGENCE ADJUSTMENT After adjusting purity static convergence 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 the steps 1 and 2 and obtain an optimum convergence After adjustment fix the wedge at the...

Page 27: ...y removed from the receptacle when for example the chassis is pulled out 2 Do not short between the LIVE side GND and ISOLATED NEUTRAL side GND or never measure with a measuring apparatus measure with a measuring apparatus oscilloscope etc the LIVE side GND and ISOLATED NEUTRAL side GND at the same time If the above precaution is not respected a fuse or any parts will be broken Since the circuit d...

Page 28: ... OUT DY V DY H DEF YOKE H OUT V OUT H OUT V OUT 42 46 SCL SDA POWER SW IN OUT AC IN Q103 SW HEAD PHONE CF901 30 31 32 SAW EXT RGB TU001 TUNER IF T921 SW TRANSF IC921 POWER REG PC921 VOLTAGE FEEDBACK IC941 ERROR AMP IC971 5 9V REG REG D901 RECT R G B V01 CRT CRT SOCKET PWB RGB DRV ECO REMOCON KEY IND VIDEO AUDIO T522 HVT FOCUS SCREEN EHV B1 SP 18 19 3 58 OTH 25 37 38 6 7 8 VIDEO IN VIDEO OUT AUDIO ...

Page 29: ...AV 21L41 AV 21L41 No 51859 No 51859 2 5 2 6 CIRCUIT DIAGRAMS MAIN PWB CIRCUIT DIAGRAMS 1 2 MAIN PWB SCG 1307A H2 2W AT24C08 21DTT2 MEMORY ...

Page 30: ...5 400V MPP 1 2W 3 9 1 10W MPP QRT029J 1R2 3KV PICTURE TUBE MPP QFZ9075 104 114 5V MAIN PWB SCG 1307A H2 CRT SOCKET PWB SCG 1307A H2 2 2 Within MAIN PWB 1 2 QMPR010 200 E2 1 047 AC275V QFZ9075 473 001 AC250V 001 AC250V AC250V AC250V AC250V 120 400 001 AC250V 1W QQD0068 001 R582 22K 1 10W NRSA02J 223X 2 2 1 4W UNFR ...

Page 31: ...F CAP Metalized Film Capacitor MF R Metal Film Resistor MM CAP Metalized Mylar Capacitor MG R Metal Glazed Resistor MP CAP Metalized Polystyrol Capacitor MP R Metal Plate Resistor PP CAP Polypropylene Capacitor OM R Metal Oxide Film Resistor PS CAP Polystyrol Capacitor CMF R Coating Metal Film Resistor TF CAP Thin Film Capacitor UNF R Non Flammable Resistor MPP CAP Metalized Polypropylene Capacito...

Page 32: ... 2 345 6758 9 9 A B C D45 88E45 7F445 G H D I45 88 44JKF445 L IHM 57 88N44J F445 N 3 6 OL 5 GG545 F45P6FN L H 6A QRK5 7F44 S3 Q6 M P GGP44 4F4456FN E HE R GGP445 F445AFN HE M HA 7 QP7 P7F44PFN O G J GG 444JF4456FN H HD M HA T GGP44 5F44 6FN D D O K 6RKR7TFPFN O G NGA445JF4AFLN A 6 E 54 6T74PRFA Q6G 55 R4TJRF446 E G 6OOI B PC 5 QPJJ PFA45FN N6OO O 6 D B C 5P QRK5RRF44 FN EA O H 5R 8Q 454F 44F HE H ...

Page 33: ...No 51859 AV 21L41 33 EXPLODED VIEW CRT SOCKET PWB MAIN PWB 1 8 L01 DY01 20 V01 12 12 9 10 14 15 20 T1522 16 19 18 17 7 11 6 7 5 4 3 2 1 13 1 ...

Page 34: ... 54Z 5Y54E S 5RRP 8 5 5SF5 4I 5 4 5Y E S 5R7P O64 SF T 9 QG TZ 5Y54E S 5745 8 5 5SF545I 544 5Y E S 574 O64 SF4 49 QG 4 4 5Y54E S 574P O64 SFJK 9 QG J KZ 5Y54E S OV W X 01 0 2 O O H 57 5 O64 SFJK59 QG JK4 5Y54E S 57 O64 SF54P9 QG 54Z 5Y54E S 57 RF 7 8 D4 SFK 49 HQ K E S 57 J 8 5 5SF T4I T 5Y E S 57 K 8 5 5SFRT5I RT4 5Y E S 57P4 8 5 5SF PI Z 5Y E S 57P5 O64 SF54P9 QG 54Z 5Y54E S 57P AP5NMF54P9 6 4 4...

Page 35: ... 5P 5 P5NSF5 49 6 5 1L 743 S OV W X 01 0 2 6 6 H 5P A 5NMF TP9 6 4 4 T L 743 M 5P P 8 5NQFRTRU 6 4 RT L 743 Q 5P R 8 5NQF54JU 6 54 L 743 Q 5P 7 8 5NQF54JU A 6 54 L 743 Q 5P J O 5NSF 59 6 41L 743 S 5PR5 8 5NQF54JU 6 54 L 743 Q 5P75 8 U45 5F54 6 54441L PZ3 U 5P7R P5NSF T59 6 T41L 743 S 5P77 P5NSF 59 6 41L 743 S 5P7J P5NSFPP59 6 PP41L 743 S 5P7T 8 56QFRTTU 6 RT4 L 543 Q 5PJ7FJT 8 5NQF547U A 6 5 L 743...

Page 36: ...FR446F O H 57T5 Q6P4T7YQYF9 U H 57K5 Q6P 44YQYF9 U H 57K G 54SF OF P O H 5J75F7 Q6555F9 O H 5J7P Q US5K6F U H 5T45 Q6555F9 O H 5T4R DF5P 9 F 5J D B C 5T47 OD FPR QGF 5J D BG C OV W X 01 0 2 H 5T4JF4T Q6555F9 O H 5TP5 Q6555F9 O H 5 45 G OA6J4 A G H 5 5 G 54SF OF P O H 5 F R Q6555F9 O H 5 J Q6P47JYQYF9 U H 5 T Q6P4JKYQYF9 U H 5 5 YA YF 7 U H 5 P4 G56F P O H 5 P Q6555F9 O H 5 PP T YA YF 7 U H 5 R5 P6...

Page 37: ...O5T4 8OE4J5 F44PU ON OE N 3HDF O5T4P 8OE4J5 F44PU ON OE N N O5T4R 8OE4J5 F44PU ON OE N NF O5T47 8OE4J5 F44PU ON OE N Q O5 45 8OE4T74F445 ON OE N HE OE OL554 86947 RF445 O6E L D OL55 8694P 7F445 O6E L D OM5P75 R RRJF445 OH M N5 45 86 455 F 4 N Q O H 5445 86 45K7F44R 365 45 86L447 FJ 5 36 O H 95P45 8694744F445U IO 6D 95P4 R J 4F445U IO 6D 95T45 L 5 4Q O OH 6 H REMOTE CONTROL UNIT PARTS LIST 01 0 2 7...

Page 38: ...ACKING PACKING PARTS LIST 01 0 2 5 GG544R7F45R6FN 6 M G 6O QRTPK7F44AFN HOYO 6D D6A D P GG545P5F445AFN ON H 6OOI R QF PJ7GIF5N QH H 7 P4J TF447FN HDI A6G J 8 64 74P747 HDI A6G T D 54P5F4456FN O AHHM K 6 6A445F446 Q6 N G AH9 ...

Page 39: ...AV21L41BK BK 999 4 VP 0110 DP1059 VICTOR COMPANY OF JAPAN LIMITED HOME AV NETWORK BUSINESS UNIT 12 3 chome Moriya cho Kanagawa ku Yokohama Kanagawa prefecture 221 8528 Japan ...

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