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Toshiba 20N7XE, Service Manual

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Toshiba 20N7XE Service Manual Download Page 47

Summary of Contents for 20N7XE

Page 1: ...TOSHIBA CORPORATION 1 1 SHIBAURA 1 CHOME MINATO KU TOKYO 105 8001 JAPAN PRINTED IN JAPAN Jan 2001 T SERVICE MANUAL COLOUR TELEVISION S9S Chassis FILE NO 060 200101 20N7XE To CTV ...

Page 2: ...ODE 6 DESIGN MODE 9 ELECTRICAL ADJUSTMENT 10 CIRCUIT CHECK 17 CHAPTER 2 SPECIFIC INFORMATIONS SETTING ADJUSTING DATA 18 LOCATION OF CONTROLS 19 PROGRAMMING CHANNEL MEMORY 20 CIRCUIT BLOCK DIAGRAM 21 CHASSIS AND CABINET REPLACEMENT PARTS LIST 22 PC BOARDS BOTTOM VIEW 29 TERMINAL VIEW OF TRANSISTORS 33 SPECIFICATIONS 37 APPENDIX CIRCUIT DIAGRAMS ...

Page 3: ...assis have special safety related characteristics These characteristics are often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage wattage etc Replacement parts which have these special safety charac teristics are identified in this manual and its supplements electrical components hav...

Page 4: ...ON YOKE TEMPORARY MOUNTING RUBBER WEDGE ADHESIVE DEFLECTION YOKE PURITY CONVERGENCE MAGNET ASS Y 29 1mm 28 29 25mm 25 19mm 19 20 21 14mm 13 14 Figure 1 COLOR PURITY ADJUSTMENT NOTE Before attempting any purity adjustments the receiver should be operated for at least fifteen minutes 1 Demagnetize the picture tube and cabinet using a degauss ing coil 2 Set the brightness and contrast to maximum 3 Us...

Page 5: ...1 Do not remove cover paper on adhesive part of the wedge 3 Tilt front of the deflection yoke up or down to obtain better convergence in circumference See figure 3 Push the mounted wedge into the space between picture tube and the yoke to fix the yoke temporarily 4 Put other wedge into bottom space and remove the cover paper to stick 5 Tilt front of the yoke right or left to obtain better conver g...

Page 6: ...Service mode display Item Data 3 KEY FUNCTION IN THE SERVICE MODE The following key entry during display of adjustment menu provides special functions A single horizontal line ON OFF button on Remote or a button on TV Test signal selection a button on Remote Selection of the adjustment items CHANNEL s t on TV or Remote Change of the data value VOLUME on TV or Remote Adjustment menu mode ON OFF MEN...

Page 7: ...r item 2 Press and hold the CALL button on the Remote then press the CHANNEL s button on the TV The initialization of QA02 has been complated 3 Check the picture carefully If necessary adjust any adjustment item above Perform Auto search Memory on the owner s manual CAUTION Never attempt to initialize the data unless QA02 has been replaced 7 TEST SIGNAL SELECTION Every pressing of a button on the ...

Page 8: ...r of other modes White Green Normal Red The microcomputer operates to provide judgement of no video signal The red color is still indicated though the signal is input failure may exist in input signal line including QV01 QV01 In case of indication green Normal In case of indication red with input signal Failure may exist in output line including QV01 NOTE Component which controls character display...

Page 9: ...on in the design mode changes the adjustment items in the order of table 3 Refer to table 3 for data of design mode See SETTING ADJUSTING DATA on page 18 3 ADJUSTING THE DATA Pressing of VOLUME s or t button will change the value of data When QA02 is initialized items OPT0 and OPT1 of DESIGN MODE are set to the data of the representative model of this chassis family Therefore because ON SCREEN spe...

Page 10: ...he difference between the belt of vertical re trace and the border of black portion of inside pattern is visible After that return vertical height and con trast ITEM ADJUSTMENT PROCEDURE Belt of vertical retrace HORIZONTAL POSITION ADJUSTMENT HPOS VERTICAL POSITION ADJUSTMENT VPOS 1 Set the TV in service mode and get black or white cross bar signal with VIDEO button on remote hand unit 2 Select ei...

Page 11: ... button provides Horizontal line picture and Normal picture alternately 5 Press VIDEO button to release horizontal line picture and select the two other colors which did not light in the above step with CHANNEL s t buttons Then tap VOLUME buttons so that three colors slightly light in the same level X To correct white balance in light area select GDRV and BDRV with CHANNEL s t buttons to adjust X ...

Page 12: ...ser control to the standard 1 3 Change to adjust SCNT data Q501 SUB ADDR 05 D4 D0 X It makes the point which doesn t have a change and it adjust with screen VR 4 After adjustment return the data which are set in steps 1 2 above to original data 2 SUB COLOR PAL THIS ADJUSTMENT AFTER SUB COLOR NTSC Measuring point Q501 12 B OUT Adjusting signal Sub Bright PAL signal Adjusting method 1 Set BUS data o...

Page 13: ...SECAM color bar signal Adjusting method 1 Set BUS data of Q501 to the same value as that of SUB TINT adjustment 2 Set user control to the standard 1 3 Change COLS data COLC Difference data to adjust the peak amplitude of SECAM color bar 4 After adjustment return the data set in steps 1 2 above to the original data A V B V V p p Adjust the amplitude of color bar ...

Page 14: ...NTC data Q501 SUB ADDR 03 D6D0 so that difference between 6th peak and 5th and 7th peaks of rainbow color bar becomes 2 1 4 After adjustment return the data which are set in steps 1 2 above to original data 5 SUB COLOR NTSC Measuring point Q501 12 B OUT Adjusting signal Sub Bright NTSC signal Adjusting method 1 Set BUS data of Q501 to the same value as that of Sub TINT adjustment 2 Set user contro...

Page 15: ...hat one of lines R G and B will light slightly 5 Change CUTOFF data to adjust so that each one of R G and B will light slightly for about white 6 Release the H Line mode 7 Change B G drive data and R G B CUTOFF data to adjust white balance in bright area and dark area NO ADJUSTMENT 8 SECAM BELL FILTER ADJUSTMENT Measuring point Q501 36 B Y OUT Adjusting signal Color bar SECAM signal Adjusting meth...

Page 16: ...rt 10 CHROMA TRAP ADJUSTMENT NO ADJUSTMENT 11 H CENT ADJUSTMENT Point Receiving adjustment Adjusting signal WG PHILIPS pattern Do not use France SECAM pattern Adjusting method CONT Maximum BRIGHT Center COLOR Center Vary SUB Address HPOS to adjust picture center to screen center Set D C to minimum by CRT adjusting magnetic field 12 V HEIGHT ADJUSTMENT Point Receiving adjustment Adjusting signal WG...

Page 17: ...5 µT 5 µT 50 µT perpendicular field CIRCUIT CHECKS HIGH VOLTAGE CHECK CAUTION There is no HIGH VOLTAGE ADJUSTMENT on this chassis Checking should be done following the steps below 1 Connect an accurate high voltage meter to the second anode of the picture tube 2 Turn on the receiver Set the BRIGHTNESS and CONTRAST controls to minimum zero beam current 3 High voltage must be measured below B kV Ref...

Page 18: ... SUB COLOUR SECAM BELL FILTER RCUT GCUT BCUT GDRV BDRV SCNT BRTC COLC COLP COLS BELL Preset Data 20H 20H 20H 80H 80H 07H 80H 80H F6H F6H 01H Item Name of adjustment Preset Data Table 1 SBY SRY TNTC HPOS VPOS HIT VLIN WID PARA CNR TRAP SECAM B Y SECAM R Y SUB TINT HORIZ POSITION VERT POSITION HEIGHT V LINEARITY PICTURE WIDTH E W PARABOLA DPC E W CORNER TRAPEZIUM 08H 08H 40H 0AH 03H 30H 0CH 28H 1FH ...

Page 19: ...NE JACK TV VIDEO MENU CALL On screen call Direct select Power on Digit select MENU Menu open close Level down in each function t s Menu select o Sound Mute f Power on standby Volume down up Channel select Position down up a TV VIDEO select h Picture control 8 Sound control INFRARED RECEIVING WINDOW POWER SWITCH POWER INDICATOR CHANNEL UP DOWN VOLUME UP DOWN Level up in each function LOCATION OF CO...

Page 20: ... 12 is set press MENU several times to display the SET UP menu screen Press t s to select the item POSITION And press repeatedly to set the position number P12 Pressing displays a smaller number pressing displays a larger number 3 When Position 12 is set press t s to select the item Press to complete the presetting To turn off the menu function display instantly Press the CALL button Skip function...

Page 21: ... AV SW VIDEO S VIDEO SW AV IN 1 MEMORY QT01 TEXT µ COM I 2 C BUS OSD HYBRID CONVERTER TRANS B VOLTAGE Y C RGB CHROMA VIDEO DEF Q501 VIDEO OUT Q901 Q903 Q905 V OUT H OUT ERROR AMP REGULATOR RESET Q840 F B T H V D Y V H CRT Q301 Q401 AUDIO OUT HEAD PHONE L R BUS CONTROL BLOCK SV V L R R AV IN 2 V L R MONITOR OUTPUT V L ...

Page 22: ...0 50V C214 24232103 CD 0 01 F 80 20 C215 24794470 EL 47 F 20 16V C216 24797010 EL 1 F 20 50V C217 24797479 EL 4 7 F 20 50V C218 24591104 PF 0 1 F C302 24617912 EL 2 2 F 10 50V C304 24214471 CD 470pF 10 500V C305 24617912 EL 2 2 F 10 50V C306 24795102 EL 1000 F 20 25V C307 24082049 PF 0 047 F 100V C308 24668101 EL 100 F 20 35V C309 24591102 PF 1000pF C310 24796102 EL 1000 F 20 35V C311 24214391 CD ...

Page 23: ...79 EL 4 7 F 20 250V C971 24794221 EL 220 F 20 16V CA02 24436271 CD 270pF CA33 24232103 CD 0 01 F 80 20 CA36 24436470 CD 47pF CA37 24436101 CD 100pF CA38 24436101 CD 100pF CA68 24794100 EL 10 F 20 16V CA69 24232103 CD 0 01 F 80 20 CA98 24794100 EL 10 F 20 16V CA99 24232103 CD 0 01 F 80 20 CB01 24794470 EL 47 F 20 16V CB20 24591182 PF 1800pF CB21 24212101 CD 100pF 10 CB99 24212681 CD 680pF 10 CS02 2...

Page 24: ...F 47 ohm 1 2W R867 24366134 CF 130k ohm R868 24552103 OMF 10k ohm 1 2W R870 24381151 OMF 150 ohm 1 2W R871 24988011 MF 1 ohm 1 2W R872 24377224 CF 220k ohm 1W R874 24366104 CF 100k ohm R883 24552752 OMF 7500 ohm 1 2W R884 24552752 OMF 7500 ohm 1 2W R890 24381333 OMF 33k ohm 1 2W R891 24366102 CF 1k ohm R899 24005015 Metal Glazed Resistor 8 2M ohm 1W R901 24552122 OMF 1200 ohm 1 2W R902 24552122 OM...

Page 25: ... ohm RV30 24366750 CF 75 ohm RV31 24366820 CF 82 ohm RV37 24366820 CF 82 ohm RV87 24366332 CF 3300 ohm RV88 24366102 CF 1k ohm RV89 24366122 CF 1200 ohm RV90 24366101 CF 100 ohm RV91 24366101 CF 100 ohm RV93 24366103 CF 10k ohm RV95 24366103 CF 10k ohm COILS TRANSFORMERS COILS TRANSFORMERS COILS TRANSFORMERS COILS TRANSFORMERS COILS TRANSFORMERS L301 23103938 Coil Ferrite Bead TEM2003 L302 2328968...

Page 26: ... B2 D430 23118859 Diode 1SS133 D431 23118521 Diode Zener RD8 2ESA B1 D441 23118516 Diode Zener RD9 1ESA B3 D610 23118859 Diode 1SS133 D611 23118859 Diode 1SS133 D612 23118859 Diode 1SS133 D615 23118859 Diode 1SS133 D616 23118859 Diode 1SS133 D617 23118859 Diode 1SS133 D618 23118859 Diode 1SS133 D619 23118859 Diode 1SS133 D801 23316275 Diode RBV 606 LFA D830 23118528 Diode Zener RD5 6ESA B3 D842 23...

Page 27: ...EMBLIES PC BOARD ASSEMBLIES PC BOARD ASSEMBLIES U901 23783989 CRT Drive Board PB9165 U902 23785954 Main Board PD0007 U903 23783501 B AV Board PB8980 PICTURE TUBE PICTURE TUBE PICTURE TUBE PICTURE TUBE PICTURE TUBE V901 23312830 Picture Tube A48LRH94X W TUNER TUNER TUNER TUNER TUNER H001 23321351 Tuner ECA14X9 ACCESSORIES ACCESSORIES ACCESSORIES ACCESSORIES ACCESSORIES K902 23306191 Remote Hand Uni...

Page 28: ... 28 SPECIFIC INFORMATIONS THIS PAGE IS INTENTIONALLY LEFT BLANK ...

Page 29: ... 29 30 MAIN BOARD PD0007 BOTTOM FOIL SIDE ...

Page 30: ... 31 32 BACK TERM AV BOARD PB8980 BOTTOM FOIL SIDE CRT DRIVE BOARD PB9165 BOTTOM FOIL SIDE ...

Page 31: ...69 2SC4544 2SA1788 2SA1306 2SA1186A 2SC752GTM 2SC2482 2SC2655 2SC4721P 2SC752 2SA562TM 2SA1015 2SC1815 2SC2878 2SC1740S 2SC2120 2SA9335 2SA1788 RN2203 RN2201 RN2004 RN1203 RN1204 RN2204 RN1205 RN1202 RN1201 2SD1554 2SD2253 2SD2553 2SD1556 2SC5143 E C B B C E BCE B CE E C B E C B B C E B C E ON4409 ...

Page 32: ... 34 SPECIFIC INFORMATIONS MEMO ...

Page 33: ... 35 SPECIFIC INFORMATIONS MEMO ...

Page 34: ... 36 SPECIFIC INFORMATIONS MEMO ...

Page 35: ...l 1 Aerial Adaptor 1 Please refer to owner s manual in detail Television system and channel coverage Aerial input CHANNEL SYSTEM PAL B G CCIR VHF 2 12 UHF 21 69 CATV 1 PAL D K CHINA VHF 1 12 UHF 13 57 CATV 2 PAL I UK UHF 21 69 SECAM B G CCIR VHF 2 12 UHF 21 69 CATV 1 SECAM D K OIRT VHF 1 12 UHF 21 69 CATV 3 NTSC M US VHF 2 13 UHF 14 69 CATV 4 NTSC 4 43 5 5 6 0 6 5MHz NTSC 3 58 5 5 6 0 6 5MHz PAL 6...

Page 36: ...TOSHIBA CORPORATION 1 1 SHIBAURA 1 CHOME MINATO KU TOKYO 105 8001 JAPAN PRINTED IN JAPAN Jan 2001 T SERVICE MANUAL COLOUR TELEVISION S9S Chassis FILE NO 060 200101 20N7XE next page ...

Page 37: ...tors are 1 6W and 5 tolerance carbon resistor unless otherwise noted as the following marks 1 2R Metal or Metal oxide of 1 2 watt 1 2S Carbon compsistion of 1 2 watt 1RF Fuse resistor of 1 watt 10W Cement of 10 watt K 10 G 2 F 1 2 CAPACITOR Unless otherwise noted in schematic all capacitor values less than 1 are expressed in F and the values more than 1 in pF All capacitors are ceramic 50V unless ...

Page 38: ...GITAL MULTI METER from point indicated to chassing ground using a color bar signal with all controls at normal line voltage 220 volts 5 Waveforms are taken receiving color bar signal with enough sensitivity 6 Voltage reading shown are nominal values and may vary 20 except H V NOTE 1 RESISTOR Resistance is shown in ohm K 1 000 M 1 000 000 All resistors are 1 6W and 5 tolerance carbon resistor unles...

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