TX807 - Wiki Karat
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1. THOMSON multimedia Marketing France THOMSON hi 16 GENERAL Luminance chrominance and RVB processing is performed by the integrated cir cuit 1401 All regulation and commands to this integrated circuit are made via the bus All frequencies required for this video processing luminance delay bandpass R Y and B Y demodulator are obtained by VCO PLL whose 4 43MHz PAL SECAM and 3 58MHz NTSC quartz oscillators are references This circuit has two video inputs a video or luminance input and a chrominance input The pins 13 and 17 receive the video signal originating from the FI stages via the FM audio inter carrier rejecters 0133 and 0134 The pin 11 receives the video or luminance signal originating from input 20 of the peritel connector AV1 The pin 10 receives the chrominance signal originating from input 15 of the connector AV1 LUMINANCE PROCESSING The video signal available after the switches CVBS and CVBS Y C is directed to the chrominance rejecter the delay 110ns the peaking and coring stage and finally informs the RVB matrixing circuit The peaking and coring stage improves the luminance signal transitions without increasing noise CHROMINANCE PROCESSING The SECAM or PAL or NTSC chrominance sub carriers extracted from the video signal and shaped by the bell circuit SECAM or the bandpass filter PAL and NTSC are transmitte2. CHAT ma BB639C RH75 AR2 CHN ANT 1 ci LH47 SP RH56 vi BB639C 1 22K I Es 12 RHIS VAL 22K 7 88535 GH25 Z amp D 1 1 VALS on 1 ou RH59 me 888 22K 1 F 1 L Liisa 68P Wi VAL BB639C 1 up I I I I CH86 1 T i VAL KO T w 1 1 RH50 22K Lag 1 I I I I WT 1 1 IH TD I IF2 A hare fusi J NOISN3L SISSLNIS INOISNAL IG ISSLNIS JS3HINASSONRINNVdS NOISNIL IS3HLNAS SISIHINAS NOISNIL 6705115 YANNL TI lt 3 E gS TUA6010X AHTI mm T IH70 Ser I 22K 2 og LH10 100P i 0 75P si 22 yum me M e 55 sf i LHO1 B8535 100P 1 88535 D 09 RHYS 37K m 1 1 H CHAB 149 lt O DHO3 BB535 chos M tuus 5 22K 10P enm ou lt 2 1N m n RHOS AIR 190 nHo1 2 lt I pu E 0835 BB639C m 4 2
3. l i El cm um 01760 T m 0 n 6614 viid TX807 20 First issue 02 98 TELETEXT MODULE MODULE TELETEXTE VIDEOTEXT MODUL MODULO TELEVIDEO MODULO TELETEXTO COMPONENT SIDE C TE COMPOSANTS BESTUCKUNGSSEITE LATO COMPONENT1 LADO COMPONENTES TELETEXT BOARD 5281 CX58 di AR jg Cr 5 8 BE 52 n TX53 S 059 db 48 CX60 4k 8 x Dei Kb eum LX53 53 1 DX53 37 oe 9 2 33 amp TX52 E BE 28 gig uw e 10576290 10 SOLDER SIDE C TE SOUDURES L TSEITE LATO SALDATURE LADO SOLDADURAS FT04 TRE 7 JX52 TX807 TELETEXT ee Ds x gu x 5 191 74 8 d E CX64 E x NE g 152 8 YX04 gt y 3451 a gt TT EUG ES YX06 gt u YX13 i ET 3 m 5 7 RX59 RX58 d Bg m amp 558 2 DG XM 3 offs gt g me 5 3 FT03 20821040 18 TX807 First issue 02 98 21 THOMSON THOMSON TELEFUNKEN SABA Brandt LE PRINCIPE ET LA MAINTENANCE DES TELEVISEURS CHASSIS TX807 CLICK HERE FOR INDEX OF MAINTENANCE MANUAL Code 350 608 70 05 98 PRINCIPE ET MAINTENANCE TELEVISEURS CHASSIS TX807 No rarslajor eien wortdvide
4. MULTI MEDIA THOMSON multimedia Marketing France 35 LLO5 RL45 0147 ES VTU 86V CL47 RL 8 T das RL 41 DL25 DL20 9 27V RVO7 RVO9 8 5VS FE EI 2 EHT OP 50 security if OP gt 3 8V 16 security if FAULT lt 1 8V ou gt 4 2V IV01 IR01 THOMSON multimedia Marketing France THOMSON iji LE SAFETY In the event of an absence or overvoltage of the 180V signal due to the inter vention of the diode DL21 The VTU voltage falls This may result in resistor RL45 being cut In the event of damping on the THT disconnection of line deviator the VTU vol tage falls In both of these cases the FAULT signal falls below 1 8V causing the following reaction STANDBY 6 seconds ON 6 seconds STANDBY 6 seconds etc If the problem disappears the television remains on In the event of an increase in the VTU voltage of about 20 the signal EHT OP reaches 3 8V causing the following reaction STANDBY 3 seconds ON 1 5 seconds STANDBY 3 seconds etc If the problem disappears the television remains on In the event of an increase in the VTU voltage of about 40 the FAULT signal reaches 4 2V causing the following reaction STANDBY 6 seconds 6 seconds STANDBY 6 seconds etc If the problem disappears the television remains NOTES CENTRE DE FORMATION TECHNIQUE
5. SYSTEM Colour Bar Test pattern W 100 VOLTAGE Mie de barres couleur blanc 100 Farbbalken W 100 UB Monoscopio delle barre colorate bianco 100 Mira en color blanco 100 AVI GS SERVICE MODE It is necessary to enter the Service Mode in order to carry out alignment of the TV set Most adjustments car be made with the RCU except the Focus and Screen voltages 1 Service Mode Access 1 1 With the switch the TV set into the Standby mode 1 2 Switch Off the TV set by mains supply switch wait until LED is dark 1 3 Whilst pressing the Magenta text button on switch On the TV set using the mains switch Continue to press the Magenta text button until the Service setup Sub menu appears VT01 1BIL 2BD 3B 4l FFI Important The Service Mode cannot be entered if any equipment is connected to the Scart socket i e pin 8 switching voltage present 2 Service Menu 2 1 Navigation Press the AA 7 buttons to select the menu line Press the lt buttons to make adjustments or selection of menu item 2 2 Service Sub Menus Service Set up Sub menu Sub menu Video Sub menu Geometry Sub menu Hotel Menu 2 3 Activation of Service Sub Menu To navigate around the Service sub menu press the Magenta button on the RCU to step through the sub menus in the following order No Menu gt Service Set up Sub Menu Service IF Sub Menu 2 Service Geometry Sub
6. TE EN Fosc too low BGALL 12k ROM Ge x Fosc too high lt gt X BG DKK VST No Text LDK BG Europe market VA 50 lt E IFPL IF PLL adj 50 Hz VCO 38 9MHz BG DKK 12k ROM VST No Text Asia market L FA IF PLL adjustment chassis LL sem 16krom CO33 9MHz VA 60 Qe BG DKK VST ST text DKA BG Europe market 60 Hz PAL or SECAM colours bars signal BG DKK 16k ROM VST ST text Asia market BGIDUU la 38 9 MHz 33 9 MHz 15mV De LDK LBG VST Philips VSH lt 11 Signal PAL BG or SECAM L 389 MHz 15mV nd TV Norm BG or L Program Menu market L L bte L d BGIDUU 16k ROM Defaut Value lt EURO FR EURO norm BG LDK BG VST Greek UK EB ae HSH 20 text vL Wy VA50 18 Europe market VA 60 20 l L FA For BGHILL se VSH 1A Signal SECAM LU 339 MHz 15mV TV Norm Program Menu Adjust IFPL or L FA until the indicator x is within the brackets x gt 1BIL 2BD 4 501 1 Standard R gler IFPL ou pour que le curseur X soit dans la fen tre AFC lt gt FPL oder einstellen wenn der indikatc x innerhalb der Ulammern ist lt x gt overscan V 107 Regolare FPL L FA in modo che l indicatore x rimanga all interno delle parentesi X gt ROM Defaut Value Aju
7. Tous dots ds reprad ctor d macio d adapaior dagai resetv s pou 29 5 Es pays Lhsbamsda ar dieser Zaichrura sebar urs 2 Mein Verdef akigurger auch aLszLgswaisa mi L rer varsriger 2 Lsirmurg 3 bes Petz vorberater 1381 iriproduzore 3 133 0 3 esecuzione sora par 1 731 passi Darachos de rapraduocior de de ad pracior de sjscu cor reservados par THOMSON r TABLE OF CONTENTS FOR THE 807 TELETEXT RT PAGE 63 POWER SUPPLY THOMSON i THOMSON multimedia Marketing France CONTENTS GENERAL CONDUCTION OF 20 SWITCHING POWER SUPPLY BLOCKING OF TP20 SWITCHING POWER SUPPLY SOFT START POWER SUPPLY BEHAVIOUR IN STANDBY REGULATION SAFETY DEMAGNETISATION TROUBLESHOOTING DPO1 DP80 100 5 UB to 115 5V CP09 T 1 2W 13 5V 10 TT sw 20v RP30 2 zi CP90 12 j 7 0 37 38 CP38 RP28 RP26 FP58 ER Wes 4 IP50 TP52 TP22 e CP22 pr PG 299 CR BURST O A 2 1R01 RP54 p ON 12 5V Sby 10V DP57 THOMSON multimedia Marketing France THOMSON iti o 7 GENERAL It is FROSIN FRee Oscillating Safe INtelligent auto oscillating switching powe supply The ac supply voltage is in the range 180 to 265V When operating switching frequency is of the order of 70kHz for power co
8. iom oe 00 0608 270PF 7 RED h AUDIO IN 1 A VAL 47000 FS DKO3 S VY 28 T REDIGREEN 2 06 2 1 POSITION I COLOUR BI COLOUR u INSERT DELETED DK03 DELETED INSERT FOR 2 LEAD BI COLOUR LED T 005 DELETED INSERT RKO DELETED INSERT DKO DELETED INSERT 1 1 1 1 1 39A Ca INSERT DELETED RKOS DELETE mo DELETED INSERT FOR TX807 INTEGRATED CIRCUITS AND TRANSISTORS OUTLINE CIRCUITS INTEGRES ET TRANSISTORS INTEGRIERTE SCHALTUNGEN UND TRANSISTOREN CIRCUITI INTEGRATI TRANSISTOR CIRCUITOS INTEGRADOS Y TRANSISTORES SAA5281ZP E TMP47P1637VN STV5348D STV8225 ST24W04 TDA 7267 1 ee a 2120 TDA 9320H BC 847B BOSE 2 78109 858 BC 337 1152 STP3 NA80F1 857 547 BF 422 MMBTH10L BC 54aB BF423 e DTC144EK BC 558B 2SA1020 2502236 TX807 24 First issue 02 98 VIDEO AMPLIFIER BOARD PLATINE AMPLIFICATEURS VIDEO VIDEOVERSTARKERPLATTE PIASTRA AMPLIFICATORE VIDEO PLATINA AMPLIFICADOR VIDEO COMPONENT SIDE COMPOSANTS BESTUCKUNGSSEITE LATO COMPONENT1 LADO COMPONENTES 1 R ae gt SEE RT92 at SOLDER SIDE C TE SOUDURES L TSEITE LATO SALDATURE LADO SOLDADURAS PGB TX807 CRT
9. THOMSON multimedia Marketing France 220V ALTERNATING De solder point 1 of 1105 Connect the base of TP52 to ground to avoid any instabilities at the start Supply 220V AC TP20 collector 580Vcc T 205 UB 104V Without cutting the supply load UB with a 220V 75W bulb TP20 collector 580Vcc T 1 Ops UB 104V _ RH LE CONTENTS THE MICROCONTROLLER AND ITS ENVIRONMENT POWER SUPPLY AND FUNCTIONAL SIGNALS STANDBY ON COMMAND EXTERNAL COMMANDS CHANNEL AND STANDARDS MANAGEMENT OSD SIGNAL GENERATOR OTHER COMMANDS MANAGEMENT THOMSON iii Marketing France KEY BOARD RIR AVI 080 CLOCK SAFETY INT HOLD RESET 5V 12 ENABLE CLOCK EEPROM IRO2 6 5 LI 7 L Ce TUNER CTT5000 TELETEXTE 1X01 IV01 LOGIC CONTROL SWITCHING NORMES SWITCHING AUDIO B1 B3 BU PWM CTT 5045 R V B FB OSD MUTING BURST sby RED LED TV ON OFF RADIO ON OFF THOMSON multimedia Marketing France THOMSON iii 3bENERAL Management of TX807 rack is ensured by a 4 bit microcontroller th TMP47C1637 ts clock speed is 6MHz t is associated with an EEPROM memory IRO2 for the storage of user parame ers the service mode and backup in the event of mains power failure t performs the following functions Remote control and keyboard management Standby or switching on the television or radio Standards sw
10. and V present with and without video signal are required fo setting the position of the OSD window with respect to the television raster NOTES If the line retum impulses are absent there is no OSD If the raster return impulses are absent from 27 or 38 the microcontroller IRO1 wil no longer perform functions and consequently the screen will remain black THOMSON MEDIA Veure muted AVI ds d d da ds ds ds ds ds AF TF TF TF dE TF TF TF TF TF RR24 RR25 8 5VS LOGIC CTRL i 0V BG SV LL 24 24 FORMATION TECHNIQUE 5V AV L HRG AV BG RR29 ONT CH TRO6 RR51 22 1 21 d MUTE TA21 A au RR81 O C 5VS s RR80 Eo 26 Er 5 a v O RADIO POWER ON lt Ic F RR43 O TO POWER SUPPLY THOMSON hi OTHER COMMANDS Pin 15 receives the slow switching from the peritel connector AV Pin 8 performs switching of internal external audio sources in 1120 via the transis tor Pin 6 audio MUTE it is enabled at 5V For 36cm televisions pin 36 of IRO1 grounded by a 10K resistor mute is enable when the television is switched on or switched to standby For the other cases mute is performed by the software in IVO1 For 51 and 55cm televisions pin 36 of IRO1 at 5V by a 10K resistor mute i enabled when the television is switched on channel is changed in the absence c a si
11. conduc ting time of TP20 therefore becomes longer and longer THOMSON mm 100 5V UB to 115 5V 12W 135V sw 20v A TP52 BURST 2 1R01 ON 12 5V DP57 Sby 10V 6 8V THOMSON multimedia 4 Marketing France CENTRE DE FORMATION TECHNIQUE THOMSON ti 9 FROSIN CIRCUIT During the energy restitution phase the transistors TP22 23 maintained turned 01 by network 2 of LPO3 DP37 38 and RP37 ensure that TP20 is turned off At the end of demagnetisation the voltage sent to the collector of TP20 fals and CPO charging starts an oscillation cycle with the primary coil of LPO3 Consequently tht collector voltage of TP20 continues to fall when it reaches 300V The new TP20 saturation command occurs when TP20 has a collector voltage close to 0 an effect obtained by the delay resulting from the negative voltage applied to 2 of LP03 This limits power losses due to TP20 switching and the effi of this power supply is thus increased to 8196 in operation 38 in stand by delay results from the discharge time of TP22 23 related to FROSIN circuit DP37 38 RP37 by control of saturation current and the charge time of CP23 RP25 when Pin 2 of LPOS becomes negative POWER SUPPLY BEHAVIOUR IN STANDBY In standby because the energy required by the secondary coils is low the satura tion time for TP20 tends to a value below 1 us a value too low to affect power sup ply
12. teievision is switched off Because the 9 1V voltage disappears quickly these two transistors saturate and connect pin 3 of 1421 to ground 1 2W POWER AMPLIFIER The integrated circuit IA22 TDA7267 powered by the voltage UA is used It receives on pin 4 the audio signal originating from output 15 of 1401 The gain of this amplifier is determined resistor network in the integrated circuit The transistor TA21 controlled by output 6 of the management microcontroller MUTE 5V allows audio mute when the television is switched on or switched to standby The transistors TA22 and TA23 allow audio mute when the television is switched off Because the 9 1V voltage disappears quickly these two transistors saturate and connect pin 3 of 1422 to ground THOMSON multimedia THOMSON MEDIA Marketing France t NOTES CENTRE DE FORMATION TECHNIQUE 61 59 THOMSON TELETEXT MULTI MEDIA THOMSON multimedia Marketing France TELETEXT PROCESSING CONTENTS 63 THOMSON MULTI MEDIA N _ P __ 15 CVBS SW 1 5Vcc VTXT 2Vcc DX02 B TXT 2Vcc DX03 FB TXT Ke 4 5 3 11 22 DX05 RX14 3 9V THOMSON multimedia Marketing France QXO1 13 875MHz CENTRE DE FORMATION TECHNIQUE 64 S9 TELETEXT PROCESSING TELETEXT is managed entirely by the microcontroll
13. 0V voltage required for supplying the RVB stages is obtained Pin 10 a negative 120Vc c impulse By DL15 a 12 5V voltage raster and a 12V voltage general power supply are obtained Pin 3 a negative 70Vc c impulse DL50 a 7V voltage is obtained This volta ge is brought to 5V teletext HF via the stabilisation TL50 DL51 validated by Pin 5 a positive 24Vc c impulse HTR for filament heater 33 THOMSON iii Marketing France ET ve THOMSON MULTI MEDIA VP THOMSON multimedia Marketing France 34 GE RASTER POWER ce effect of the deviator The raster power amplifier receives on its inputs 1 and 7 the raster sawtoo th signal from pins 46 and 47 of IVO1 IFO1 is supplied by the voltages 12 5V and VNP 11V originating from the THT during the raster outward scan Furthermore during this time the capacitor is charged to VP On the raster return scan 01 is supplied by VP the charge on CF03 and by VNP This allows compensation for the self inductan The pin 5 of IFO1 delivers the current to the raster deviator Connected in series with deviator the resistor RF05 develops the current image at its terminals for the counter reaction of the amplifier IFO1 The components RFO1 and CFO1 limit the frequency range The resistor damps line oscillations originating from the line deviator THOMSON
14. 37 65 CONTENTS TUNERS VOLTAGE SYNTHESIS IMAGE FI SOUND FI HF FI THOMSON t Marketing France DHO1 DHO1 RH07 08 09 33V RHO7 08 09 01 02 04 CH03 04 05 TUNER 5045 5000 07 540 THOMSON me e e e e H CTT5045 TUNER CTT5000 TUNER The CTT5000 is a tuner equipped with a freguency synthesiser It is controlled by the microcontroller IRO1 via the bus IIC for standards switching and channel management It covers the following freguency ranges The CTT5045 is a tuner eguipped with a voltage synthesiser It covers the followin freguency ranges VL 45 25MHz to 140 25MHz V 147 25MHz to 423 25MHz U 431 25MHz to 863 25MHz The varicap voltage in each of these ranges varies from 0 8V to 33V This varicap voltage is obtained from the VT period close to 87 5 and variable cyclic ratio ori ginating from output 1 of IRO1 VL 48 25MHz to 112 25MHz VH 119 25MHz to 399 25MHz U 407 25MHz to 863 25MHz The information output on the tuner s pins is as follows mW gt gt EN 5V input at VL B1 5V supply THOMSON iii Marketing France DE S TUNER CTT5045 RHO1 02 04 CH03 04 05 SELECTIVITE RH07 a
15. France 12V 48 5VS VIDEO BOARD 0808 21 Ti 1 Lal 23 TV05 v RR18 CV26 L 5Vcc Tower 12 RR 5V 5VS TV08 Ops un RR49 2 20ms 0 DRO3 4 12 5 T 64 s 0 TR05 HFY 7 de 105 17 ops TVO4 B GR ln hais e X Pavec 22 CENTRE DE FORMATION TECHNIQUE THOMSON multimedia Marketing France THOMSON ti OSD SIGNAL GENERATOR The microcontroller IRO1 produces the necessary signals for the display of menu on the screen Via pin 25 it delivers the encrustation command FB fast blanking This results via the transistor TVO1 in input 26 of IVO1 being informed and allows the RVB out puts of 1001 pins 19 to 21 to be cleaned Using pins 22 to 24 it delivers the RVB signals These signals are amplitude adjus ted black level corrected using the burst port impulse and sent to the RVB ampli fier The transistors TV08 TV05 and 7 perform signal alignment A clock having a speed close to 7MHz pins 28 and 29 sets the encrustation frame width It is enabled in OSD mode only The line return impulse HFY taken from point 7 of the line transformer LLO arrives at pin 26 via the transistor TRO5 A raster return impulse arrives on pin 27 It is obtained by integrating the sand castle RR67 RR68 CR40 available at 41 of 1001 and by the shaping transisto TR10 These two signals H
16. MHz for the other standards and bands The tuning frequency of the demodulation volant LI30 is regulated via the bus IIC It is 33 9MHz in the 1 band and 38 9MHz the other standards and bands At the tuner output a 40 4MHz rejecter is disabled in the 1 L band Regulation of HF CAG is performed by IRO1 service mode and informs IVO1 via the bus IIC The diodes 0133 0134 improve response in the event of large variations in the video signal THOMSON t Marketing France CENTRE DE FORMATION TECHNIQUE LI61 161 162 RE 6 64 IF RY THI 110 VG 40 4MHz NORM SW SV BIL THOMSON iii o 9 1V 9 1V n 0120 R FERT 2 0121 40 4MHz 32 4MHz TI20 INV BG 5V QI AUTRES 0 5 5MHz SOUND SW 4 THOMSON multimedia Marketing France SCART AV1 7806 OV BG INV 3V LL 5V AV L LOGIC 7 5V AV BG CONTROL De 8 de IRO1 27 SOUND INTERMEDIATE FREGUENCY LU STANDARDS The integrated circuit 120 STV8225 with the gabarit QI20 are used The central frequency of the gabarit is switched from 40 4MHz in the 11 band to 32 4MHz in the 3 4 5 LL band Output 3 of IRO the transistors 60 20 21 and the diodes 0120 21 perform this switching BGI STANDARDS The integrated circuit IV01 TDA8842 with the bandpass filters 0131 32 are us
17. Menu 3 Service Video Sub Menu 2 Hotel Menu lt No Menu Service Set up Sub Menu etc 3 Alignment and storing new function value 3 1 The current value of the selected function is displayed in a hexadecimal form to the right of the function name This value IS adjusted by means of the RCU lt gt buttons 3 2 To STORE the functions new value whilst in any of the Service Sub menus press the OK button on the RCU 8 3 To leave the Service Sub menu press the Exit button on the RCU 4 Temporary exit from Service Mode 4 1 To temporary leave the Service Mode press the Exit button on the To access the everyday menus press the Menu button on the 4 2 to the Service Mode press the Magenta button on the RCU 5 Leaving the Service Mode 5 1 To leave the Service mode either switch the TV set into Standby switch Off the mains supply TX807 First issue 02 98 highest output Adjust Screen voltage VG2 120v 5v 14 145v 5 20 amp 21 B G RED CRT 510221 v Collector TT52 TT62 TT72 kj r 5 T Cutoff leve GND Sharp picture 14 105 v 1 5V 20 21 1155 1 5V MODE SERVICE F Le mode service sert au r glage de l appareil Toutes les operations de r glage s effectuent l aide de la t l commande sauf les r glages de Focus et de tension de grille amp ran 1 Acc s au mode service 1 1 Commuter le t l v
18. RHO9 ev THOMSON ii THOMSON multimedia e AMPLIFICATION DEMODULATION VOLTAGE SYNTHESISER During TV channel searching the microcontroller 01 produces output 1 the tuning signal VT for the varicap diodes This is amplified and inverted by the tran sistor THO1 The transistor THO1 receives 33V supply due to the voltage VTU and the zener diode DHO1 A low pass filter RH01 02 04 CH03 04 05 then trans forms this signal into a dc voltage When transmitter is found 1801 is informed by 01 presence of synchro the bus I2C A slowing down in the progression of the varicap voltage should then occur Then with the 5 of CAF informing 01 by the bus fine tuning on the received transmitter will be performed THOMSON NOTES CENTRE DE FORMATION TECHNIQUE 43 5V 8 5V 0133 0134 VIDEO 2 5 161 61 62 C163 C164 33 9MHz NORM SW DV BIL THOMSON multimedia Marketing France FORMATION TECHNIQUE THOMSON 44 Sv IMAGE INTERMEDIATE FREQUENCY The integrated circuit IV01 is used for this image FI It comprises the demodulation stages positive and negative and the CAGs Standards switching is transmitted to IVO1 by the bus IIC The gabarit d entr e QI30 has 2 NYQUIST flancs 33 9MHz for the 1 L band and 38 9
19. TENSIONE SINTESIS DE TENSION T807 V01270001 OPL 7807 V212700010 T807 V312000010 T807 V412000000 VO 00031 V21 N700031 V31200001 OPL V41 00031 01 NO05091 V21 N705031 V31 NO00031 41 00003 VO N705091 V21 705091 31 5031 V41 00091 V31 NO05091 V48N005091 V36C000030 TX807 First issue 02 98 LOCATION OF CONTROLS SERVICE LAGEPLAN EMPLACEMENT DES REGLAGES POSIZIONE REGOLATORI DI SERVIZIO SITUACI N DE LOS AJUSTES 01 2i WGND 0132 0131 1234567 Part of board connected to Mains supply Partie du ch ssis reli e au secteur Prim rseite des Netzteils Parte dello ch ssis collegata alla rete Parte del chassis conectar a la red 222 SK08 8 05 SK07 BROT DP23 0 37 0 38 DP26 8 5V j 8004 BV01 0006 1 DI StL WG 6 10 System Voltage 5 54 1 5V 1 115 5V 1 5V 180V 0 GND WT02B 00 Use Isolating Mans transformer Utiliser UN transformateur isolateur du secteur Trenntrafo verwenden Utilizar un transformador aislador de red Utilizzare yn transformatore per isolarvi dalla rete TX807 First issue 02 98 ADJUSTMENTS REGLAGES EINSTELLUNGEN REGOLAZIONE AJUSTES Peak white pattern SCREEN fe 0 a 5096 s Contrast 100 FOCUS LL05 FIFE Brightness 0 HH Test pattern andard values MAIN Q Q 50
20. THOMSON Brandt FERGUSON NORDMENDE SABA TELEFUNKEN THOMSON TV SERVICE MANUAL DOCUMENTATION TECHNIQUE TECHNISCHE DOKUMENTATION TX807 DOCUMENTAZIONE DOCUMENTACION Go to page number two for index of pages tn RA rek parag akah ai ee ATTENTION Avant toute intervention Sur ch ssis lire les recommandafions de s curit ACHTUNG Vor jedem Eingriff auf diesem Chassis die Sicherheifsvorschriften lesen ATTENZIONE Prima di intervenire sullo chassis leggere e norme di sicurezza IMPORTANTE Antes de cualquier intervencidn leer as recomendaciones de seguridad WARNING Before servicing this chassis read fhe safety recommendations Code 350 588 40 0298 23M TX807 Print ROSSEELS PRINTING 0153 01111 e PAS mae n met NI no No copying translation modification on other se authorized All rights reserved worldwide e Tous droits de reproduction de traduction d adaptation el d ex cution r serv s pour touslespays S mtliche Urheberrechte a n diesen Textenund Zeichnungg stehen uns zu Nachdrucke Vervielfatigungen auch auszugsweise nur mit unserer vorherigen Zustimmung zul ssig Alle Rechte vorbehalten e diritti d riproduzione di traduzione e esecuzione sono riservati per L I paesi e Derechos de reproduccion de traduccion de adaptacion y de ejecucion reservados para todos los paises TK 807 Index of pages Information Loca
21. arer ensures entry into the static phase This second com parer receives line return impulses originating from the pin 7 of the line transfor LLO5 via pin 41 of IVO1 The line signal is available on output 40 of IVO1 RASTER GENERATION The integrated circuit IVO1 is used A ramp generator pins 51 and 52 of IV01 and a vertical divider triggered by a line signal and reset by the raster synchronisation provides a raster sawtooth signal This signal is available on pins 47 and 46 of 01 vertical amplitude compensator 6 3 volt depending on beam current is obtained from the information EHT COM 1V at 2 8V which arrives on pin 50 of 01 MUTE GENERATION The video identification stage analyses the presence of the line synchro and vers mute information This is transmitted to 01 via the bus In the absence of line synchro the television switches to standby after 5 minutes MULTI THOMSON multimedia MEDIA Marketing France THOMSON 29 0 THOMSON MULTI MEDIA TLO3 UA VTU 86V FLO1 THOMSON multimedia Marketing France VP 12 5V YLO3 CENTRE DE FORMATION TECHNIQUE LE LINE TIME BASE COMMAND The signal H originating from the output 40 of 1401 is shaped by RLO1 CLO2 and 0107 The driver stage is composed of the transistor 1101 The cell RLO2 CLO1 limits the overvoltage peak which appear
22. ase of an image containing only few small dark areas Regulation of brightness and contrast is performed on these RVBs On outputs 19 to 21 of the black level varies from 2 2V to 3 2V depending on brightness set ting and the white level varies from 3 2V to 4 2V depending on contrast setting BEAM BRAKE The pin 22 of IVO1 receives the beam current information originating from point 6 of the line transformer If the voltage on this pin falls the contrast then the bright ness are reduced The components CL61 RL61 and DL60 perform the switching between peak beam brake and average beam brake CUT OFF WARNING Measurement of cut off currents is performed over 4 lines after raster return 20 to 23 and 333 to 336 For lines 20 and 333 the tube leakage current is measured For lines 21 to 23 and 334 to 336 the cut off current for the RVB guns is measu red For these measurements the RVB and IVO1 outputs deliver impulses whose peaks are at around SV The pin 18 of 1 receives these measurement currents THOMSON n CENTRE DE FORMATION TICHMIQUI e RVB AMPLIFIERS THOMSON im RVB AMPLIFIERS CONTENTS CRT 51 55 cm CRT 36 cm 80V 180V 95 BLACK I THOMSON multimedia Marketing France THOMSON iii NE o e o o 56 48 RVB AMPLIFIERS The ihree amplifiers are similar The 10 transistor version equips 51 and 55
23. cm tubes The 7 transistor version equips 36cm tubes For the 10 transistor versions the transistors TT51 TT61 and TT71 improve res ponse time The reference voltage obtained by TT81 and its associated components deter mines the operating point of the three amplifier The transistors TT53 TT63 and TT73 sample the tube cut off current BLACKI for tube servo assistance The zener diode DT82 provides overvoltage protection THOMSON MULTI THOMSON multimedia MEDIA Marketing France 57 AUDIO POWER AMPLIFIER 68 THOMSON LP CONTENTS POWER AMPLIFIER 3W AND 5W POWER AMPLIFIER 1 2W 59 CRT 36 cm Audio Power 3W CRT 51 55 cm Audio Power RA26 THOMSON e RA25 THOMSON multimedia Marketing France CRT 36 cm Audio Power 1 2W CENTRE DE FORMATION TECHNIQUE 60 19 3W AND 5W POWER AMPLIFIER The integrated circuit IA21 TDA7252 powered by the voltage UA is used It receives on pin 5 the audio signal originating from output 15 of IV01 The com ponents RA25 RA26 and 24 determine the gain of this 26dB amplifier The transistor TA21 controlled by output 6 of the management microcontroller MUTE 5V allows audio mute when the television is switched on channel is changed television is switched to standby or when there is no signal The transistors TA22 and TA23 allow audio mute when the
24. d to the R Y and B Y demodulators Chrominance identification is performed automatically The delay circuit 1 line with summing circuit are incorporated in IVO1 After saturation regulation the R Y and B Y signals are sent to the RVB matrixing stage THOMSON ii THOMSON mimi NOTES CENTRE DE FORMATION TECHNIQUE RV15 CHROMA 04 20 6 1 REJECT CUEOFEESOB 6B to 3 de BVO1 DEMODULATION RETARD SATURATION RGB SELECTION CONTROL to 4 BV01 R Y B Y 645 BLACK STERCH CONTRASTE to 5 de BV01 ES ET ET 01 Gel 13 21 7 44 25 23 UB1 Q Q 7V I min E av I TN RL62 LLOS c SDA SCL Fe e vi R RL65 RV29 DV0 02601 RC01 77 6 4 43MH RV33 RL60 3MHz L 1 RL TI33 CCO1 34 T CL61 DL62 63 ES 42V DL SE 85VS 63 0002 RL61 DL60 TELETEXTE 404 6V I min 0 5 I max 01 de 16 11 Y CVBS AV1 AV1 vers 19 15 4 20 de 7 AVI AVI AVI AVI THOMSON multimedia Marketing France THOMSON eu 55 RVB PROCESSING The RVBs obtained after matrixing are switched with the RVBs from the peritel entering 23 24 and 25 of IV01 The rapid switching signal FB pin 26 authorises the acceptation of these peritel RVBs Their level must be close to 800mV The black extension circuit increases contrast in the c
25. ed Output 7 of IRO1 the transistor TI32 and the diodes 0131 32 will enable the filter QI31 for BG and QI32 for I COMMANDS The LOGIC CONTROL command originating from pin 8 of IRO1 ensures exter nal internal audio switching in 1120 IRO1 via its bus IIC ensures external internal audio switching and volume control in IVO1 LOGIC CONT IVO1 120 INT a INT a EXT AV NOTES THOMSON multimedia Marketing France THOMSON CENTRE DE FORMATION TECHNIQUE CONTENTS GENERAL LUMINANCE PROCESSING CHROMINANCE PROCESSING RVB PROCESSING BEAM BRAKE TUBE SERVO CONTROL VIDEO PROCESSING THOMSON MEDIA iwat OG RETARD PEAKING CORING CHROMA REJECT DEMODULATION B Y 05 ES QCO1 CC 4 43MHz 02 AY T133 AG ES T i 0002 TELETEKTE AV DI 0134 Y 6MHz CVBS vers 19 de 15 de 20 AVI AVi AVI RETARD 645 01 SATURATION MIXING SCL FB de 16 AVI RGB SELECTION BLACK STERCH B de 7 AVI de 15 AVI BLACK RV15 EJ de 6 de BV01 18 OA to 3 de BV01 CUT OFF LOOP CONTROL Q to 4 de BVO1 CONTRASTE B to 5 de BV01 UB1 3 7V min 2V I RL62 11 05 RL65 L JA RL60 AL 34 CL61 DL62 63 4 7V DL 8 5VS 63 RL61 DESO 6V min 0 5V I max
26. efficiency in this mode A minimum conduction time circuit Ton min has there fore been added to TP20 using the components CP38 RP38 In steady state the regulation photo transistor cannot alone perform satura tion of TP22 23 and consequently the turning off of TP20 The assistance of the following is required The positive voltage produced on the terminals of RP20 in the storage phase The positive voltage supplied by the FROSIN circuit DP37 38 RP37 in the res titution phase In standby mode due to the effect of the Ton min circuit the energy stored becomes greater than the small requirements of the secondary coils Consequently the secondary voltages increase during energy restitution phases The conduction of is then such that it is alone sufficient to maintain TP22 23 saturated over several LPOGCPO9 oscillation cycles The Ton min results from the negative impulse obtained from the voltage induced I n 2 of LPO3 negative when TP20 is conducting and the charging of CP38 RP38 This impulse maintains TP22 tumed off for minimum time THOMSON multimedia Marketing France MULTI MEDIA THOMSON In standby the management microcontroller 1801 re starts the power supply fo 350us approximately every 1 Ims BURST signal which turns off the transisto P52 Due to this signal the regulation becomes operative and the voltages U ang UB increase This voltage increase is necessary when the television is s
27. el ____ ECH OV SBY OV ON SIN RR03 m SS Q4 sv 18 CHILDREN SECURITY 18 PROGRAM STOP 5 6V TRO9 RRo2 0 THOMSON multimedia Marketing THOMSON ki NET o 61 EXTERNAL COMMANDS THE KEYBOARD depending rack version the keyboard comprises 4 or B keys It is organised i 1 line column matrix The outputs pins 9 to 12 provide in standby negative signals with period approximately 40ms The function inputs pins 13 and 14 are in a low level in th absence of key operation a key is pressed high level pin 9 sweep signals pins 10 to 12 ar ransmitted to an input function CONTROL The emitted codes arrive at 35 of IRO1 They are repeated every 80ms They are composed of 12 bit serial words 4 address bits 1 call bit 7 function bits RONT PANEL LED This indicator light consists of two colour LED RED GREEN During operation the green LED is powered from VP 12 5V originating from the ine transformer n standby the red LED is powered from UA 9V originating from the main powe r Supply This UA voltage switched by transistor 1103 gives the voltage n electronic key programmable stop and safety modes it cycles between 2 states In electronic key mode the red LED flashes T 1 second In programmable stop mode the red LED flashes 1 second In time base safety
28. er The 1X01 is powered by 5V supply the stabilising circuit TX03 DX05 control led by 13 875MHz clock and has data link to 1801 the bus 1 01 combined teletext slicer and decoder The slicer separates teletext data from the video signal The IX01 processing unit checks selects and saves reques ted data in the internal RAM One page of data typically occupies 1K octet of memory The 1 01 has capacity for 8 pages of teletext The R V and signals are output via pins 8 to 10 of IX01 The rapid switching signal FB pin 12 accompanies the R V and B signals THOMSON
29. gnal and when switched to standby Pin 39 certain televisions incorporate an FM radio This output allows the radio t be switched on Pin 2 command bursts for the main power supply are generated in standby mode THOMSON t Marketing France Ze TIME BASE THOMSON tti CONTENTS LINE GENERATION RASTER GENERATION MUTE GENERATION LINE TIME BASE COMMAND LINE POWER STAGE RASTER POWER SAFETY THOMSON multimedia Marketing France 27 CVBS de CVBS Y de 20 Avi 27 87 V 5V US RR gt S O 08 8 5VS THOMSON iii QCO1 8 5VS 4 43MHz 5 2V HO CV04 HS 0 5V RV28 100Vc c RVOS3 AV E E HI RV05 8 HI 7 s 8 5VS 1105 A 1 3V Rvst VCO 0 2V commu SEPAR una H vers TLO1 SYNCHRO x 1 2V Je gt AN DRIVE vers 7 de IF01 V DRIVE vers 1 de IFO1 ii 2 5V COM de 6 1105 28 THOMSON multimedia Marketing France CENTRE DE FORMATION TECHNIQUE 62 LINE GENERATION The integrated circuit 1 01 is used A divider assembly controlled by the 4 43MHz quartz oscillator pin 35 supplies a line freguency signal A first phase comparer which receives the line synchronisation from the incident video signal locks the divider The filtre anti chasse components of this comparer RV03 CV04 and CV03 pin 43 A second phase comp
30. he pour memoriser la nouvelle valeur de r glage en NVM EEPROM 8 3 Appuyer sur la touche Exit pour sortir d un sous menu 4 Temporary exit from Service Mode 4 1 Utiliser la touche Exit de la t l commande Le menu utilisateur peut tre accesible via la touche Menu 4 2 Pour entrer nouveau dans le Menu Setup utiliser la touche magenta 5 Sortie du mode service 5 1 Pour sortir du mode service commuter je t l viseur en position de veille ou le mettre hors service par l interrupteur secteur i 1 1 1 ALIGNEMENT PROCEDURE PROCESSUS DE REGLAGES ABGLEICH VISUALIZZAZIONE DEL CHASSIS 807 VST VOLTAGE SYNTHESIS SYNTHESE DE TENSION SPANNUNGSSYNTHESE SINTESI DI TENSION SET UP SUB MENU IF SUB MENU GEOMETRY SUB MENU VNO1 HSH 00 3 1BIL 280 3B 4 50 gt VA50 00 3F FFI OFF VA60 00 VSH 00 3F Test Bar pattern used 4 3 with a geometric circle Mire utilis e 4 3 avec un cercle de g om trie Ben tigtes Testbid 4 3 mit geometrischem Kreis Formato Testo utilizzato 4 3 con cerchio geometrico Mira utilizada 4 3 con circulo geometrico 01 UR AFC Status display Visualise l tat de AFC ligne du menu 4FC Status Display Stato display AFC HSH Qe Men zeile Software code Estado del CAF S 1 nga menu i f linea dei menu Display AFC Status lt gt Teletext IC
31. ilable Validation Vorhanden Opci n activa Opzione attivata OFF Not available Non valid Nicht vorhanden Opzione non attivata Opci n inactiva hotel mode is used to keep the volume down and allow adjustment5 to the picture only Le mode hotel one MAX permet de limiter e volume et d avoir acc s seulement aux r glages image Der Hotel Modus MAX wird nur verwendet um die Lautst rke zu begrenzen und urn Bildeinstellungen vorzunehmen modo hotel consente di bloccare il volume e di accedere alla Sola regolazione dell immagine modo hotel MAX permite mantener el volumen bajo y acceder Solamente al ajuste de imagen LL O GU 108 1 BB535 zs 05 L 2P 100P T d 100P 71 SSQbTR VAL RHOS h RADI 22K ta ms Lene 18 CH de Em TUR bi VAS Im 1N lt Er m Ly DHA LH32 us mus 00006 31 BB639C si VAL VAL 4 oa L RH35 220P T T 2 RAS LI CH RH48 PK app wai RH38 1 308 ces c d 22N VAL FUN kn 5 RH39 599TR 22K n BB639C mg RH34 VAL Ki C RH41 1 car MY ANT ANT nur CH74 D aw CH46 1N
32. iseur en position de veille avec t l commande 1 2 Eteindre le t l viseur par l interrupteur secteur attendre l extinction complete du voyant 1 8 Maintenir la touche Magenta text enfonc e et mettre simultan ment le tel viseur en marche avec l interrupteur secteur Ne pas relacher la touche Magenta text jusqu apparition du sous menu de Service Setup VTO1 1BIL 2BD 38 4 501 gt l FFI OFF Attention Le mode service n est pas accessible si un appareil est 2 Menu Service 2 1 D placement Appuyer sur la touche A X7 pour s lectionner une ligne de menu Appuyer sur la touche lt pour un r glage ou une selection d une option 2 2 Sous Menus du mode service Sous Menu Setup Sous Menu FI Sous Menu Video Sous Menu Geometrie Menu Hotel 2 3 Selection d un Sous Menu En mode service des Courtes pressions sur la touche Magenta permet la s lection dun sous menu dans l ordre suivant Pas de Menu gt Sous menu Setup gt Sous menu FI gt Sous menu G om trie gt Sous menu Video gt Hotel Menu 3 Pas de Menu 3 Sous menu Setup 3 R glage des fonctions s lectionn es m morisation 3 1 La valeur momentan e de la fonction s lectionn e est indiqu e sous forme hexad cimale droite cot de la position r gler et peut tre modifi e avec la t l commande par la touche 4 gt 3 2 Dans un sous menu Service Setup FI Video appuyer sur la touc
33. itching Voltage or frequency synthesis Volume brightness contrast and colour regulation OSD signal generation Power supply control in standby mode Watchdog circuit for monitoring the time bases vL O O QRO1 6MHz 07 T CR06 RR65 P THOMSON iii e THOMSON multimedia Marketing France RR11 Ee CR26 2 1 220pF DLO1 Ee RL10 RLO9 VP L UA P VTU L SL POWER SUPPLY AND FUNCTIONAL SIGNALS POWER SUPPLY The microcontroller IRO1 is supplied with 5V pin 42 from the voltage P and the stabilisation circuit TRO1 DR02 The origin of the voltage P is the voltage UA 15V during operation and in standby at startup because VTU 0 and then TLO3 is saturated the voltage VP 12 5V in steady state because VTU 86V and then 1103 i blocked CLOCK Its 6MHz clock is obtained from the quartz oscillator QRO1 pins 31 and 32 The reset time constant is composed of RR46 and CR25 The components 02 and 2 activate this time constant when the IRO1 supply voltage is suffi cient The transistors TRO2 and are turned on when the voltage on the ter minas of is close to 5 8V 0802 threshold vbe AC SUPPLY FAILURE DETECTION In the event of mains supply failure the voltage P drops This turns off the transis tors TROSITRO2 and causes the voltage to drop to 0 o
34. mode it flashes red green in alternance THOMSON a EH 5 TUNER CTT5000 RHO1 02 04 03 04 05 TUNER CTT5045 B3 SV 81 5V NORM SW B1 L 5V OTHERS 0 32 4MHz 1120 IF SOUND LU IF PICTURE IF SOUND SOUND SW BG 5V OTHERS 0 0181 5 5MHz QI32 6MHz CENTRE DE FORMATION TECHN QUE THOMSON multimedia Marketing France THOMSON L VOLTAGBYNTHESIS TELEVISIONS CTT5045 tuner CHANNEL AND STANDARDS MANAGEMENT he pins 17 18 19 of IRO1 manage the tuner reception bands The varicap vol age is composed from the signal available at 1 of IRO1 VT the variable resisto HO and the low pass filter 1 02 04 at 05 Automatic frequenc ontrol is performed by the integrated circuit IVO1 and informs IRO1 the bus Jutput of IR01 allows The disabling of the 40 4MHz rejecter in the 1L band To tune the sound H to 40 4MHz 1 L band or 32 4MHz other case output 7 of IRO1 selects the filters 0131 5 5MHz 0132 6MHz for the FM audi iter carriers FREQUENCY SYNTHESIS TELEVISIONS CTT5000 tuner CHANNEL AND STANDARDS MANAGEMENT the bus informs the tuner for channels and standards management The 330 oltage for the varicap diodes arrives at 9 of the tuner ins 3 and 7 of IRO1 play the same role MULTI THOMSON multimedia THOMSON MEDIA Marketing
35. mu cus ee m 22K E J I RH37 gt Du 180 Dan 278 LH43 o S595TR 5 E 2 0832 FOR A BB639C W o BB639C 1N p75 o 2 MT ng ci E 4 RH03 22K CHAA 158 3 m 38 LH31 DH31 Hi cos 470P LH37 C gt 886396 22K TN CH39 cns RH7I Z I z ZA BB639C 1444 220P N m f CH28 LH81 CH59 10N 20 m 20 A y H a 2 E 0 CH56 2 J SS FE zw TUE mm S r M D o mu oe 22K gt ome S595TR 3 1838 10N Ris T O 2 2 4 C Et ti RE RH88 m 1R A DH43 108 m BB639C 2 os ee O 1N Pr 7p e TH80 6 m i MMBTHTOL a am DM 29N VAL ACE RH39 1 5 O 22K gt gt m 1 TA E 5 RHD7 2 E I A m n BANDSWITGH o Un D Dn og Vi m Bi 26 CH92 CH75 DHAG CH76 DHA AN Blll 85 1 ANT 407 I zb sv I 108 B 566 I CL DA DENOTES COMPONENTS IN LAYOUT 5v LOCI 33V 47 UNSYMM JO ef WO oo ONO RO deo ae a 0 z Z A L S Z T Z S EITA I SE ei KEYBOARD MODULE PLATINE CLAVIER TASTATURPLATTE PISATRA COMANDI PLATINA TECLADO RK07 IK06 2208 TFMK1330T Y 1 2 GND Y 1N4148 x RK04 N ves 1008 SS C gt 1
36. n by DL45 Obtaining the voltage VTU varicap TLO3 and safety after rectification by DL47 The information EHT COM beam current image taken from the foot of the split diode supplies after integration RL60 CL61 the average beam current BCL this acts on IVO1 contrast and brightness commands In the event of a sudden increa se in beam current the diode 0160 is turned off and disables the capacitor CL61 Consequently the reaction on contrast and brightness will be faster LINE POWER STAGE The primary coil of the transformer 11 05 is connected between UB and the line power transistor TLO2 via the optional circuit LLO8 RLO8 CLO8 curtain effect suppression The capacitors CL04 10 and the line deviator determine the line return time T 12ps The capacitor of S CLO5 whose average voltage is equal to UB supplies the energy to the horizontal deviator which is in series with the linearity self inductan ce coil LLO3 and its damper resistor RL03 In parallel on CLOS the optional circuit CLO3 DLO3 RL05 allows damping of the interference oscillations which occur in the event of a sudden increase in the beam current The optional diode DLOB improves horizontal framing The modulator with diodes DL04 DLO5 and CL06 minimises pumping due to the weak THT regulation The following voltages and signals are present on the secondary coils LLOS Pin 9 a positive 80Vc c line return impulse superimposed on UB DL20 18
37. n pin 37 of IRO1 The micro controller saves in the EEPROM the parameters necessary for switching the tele This input pin 34 monitors the microcontroller supply voltage If this voltage falls below 4 5V the television switches to standby MULTI THOMSON multimedia THOMSON MEDIA Marketing France MISE SOUS TENSION 5V 421401 VDD COUPURE SECTEUR 37 IRO1 INTERRUPTION 91 VP L 5VS RR11 TLO3 UA P E VTU L RESET 330 RLO9 8 5VS VXR RR72 THOMSON multimedia THOMSON MEDIA Marketing France LI TV ON STANDBY COMMAND Output 20 of IRO1 corresponds to an open drain output Wien the television is switched on it passes to a high level resulting in the satt ation of 8 and TRO7 A 8 5VS voltage appears on the collector of TRO7 an supplies the integrated circuit 1001 pin 37 The time base command signals mu output from The voltage VP 12 5V recuperated from a secondary coil of the line transformt ria the diode DLO1 takes over from the voltage UA Juring the reset the time constant CRO4 RRO7 and the transistor TRO4 suppres he 5Vcc positive impulse present on output 20 of 1801 THOMSON ith 81 O INFO INSTALL AN RR57 C O 210 TIMER SBY 4 ARS3 KEY OUT RR58 EE O PROG PROG PC RR59 AASS RAGO O14 VP KEY IN DK05 RK05 06 013 DE RRE3 epes H
38. nsump tion of 45W In standby power consumption is less than 2W TURNING ON OF TP20 SWITCHING POWER SUPPLY The ac supply voltage which is rectified and filtered by DP01 and CP08 is applied to the switching transistor TP20 the 9 5 of LP03 Simultaneously the capa citor CP24 is charged by RP05 RPO6 and RP07 When the voltage on the termi nals of 24 reaches about 9V threshold of the zener diode DP23 the transisto TP25 becomes conducting and on the switching transistor TP20 The zene diode DP21 limits the TP20 grid supply voltage TURNING OFF OF TP20 SWITCHING POWER SUPPLY The voltage on the terminals of RP20 when high enough turns on TP22 ther TP23 Consequently the TP20 grid current is diverted to ground via TP23 RP28 and RP20 TP20 is off Inverting polarity on the terminals of LPO3 results ir the following TP25 turned off Charging of CP24 via 2 of LPO3 and DP25 Recuperation of energy in the secondary coils Activation of regulation Charging of CP40 via DP40 soft start circuit TP22 23 maintained on via DP37 38 and RP37 FROSIN circuit SOFT START The negative voltage rectified and filtered by DP40 CP40 delays the instant at which TP22 23 turns on and consequently the instant at which TP20 is turned off At the start this negative voltage is zero TP22 is controlled by RP20 Later the negative voltage appears and increases delaying control of TP22 23 The
39. pply voltage of the TP20 switching supply The zener diode DP40 limits the conducting time of the TP20 switching supply ir the event of overcharging or regulation malfunction the soft start voltage will beco me less and less negative The transistor TP52 acts as an overvoltage protection When UA P is too high TP52 is turned off via the zener diode DP57 Therefore more current passe through IPO1 and consequently TP20 is less conducting The resistor RP90 protects against overvoltages on UA DEMAGNETISATION SICABLE The voltage VP 12V recuperated from the line transformer is used When this vol tage appears television ON the transistor TP71 saturates during the charge time f CP71 5 to 10 seconds lt causes the contacts of relay SPO1 to be closed thu activating the demagnetisation loop MULTI THOMSON multimedia THOMSON MEDIA Marketing France NOTES CENTRE DE FORMATION TECHNIQUE LOW VOLTAGE Discharge the capacitor CP08 bilities 220 0 2V WB 104V 124V THOMSON titi Supply 12V DC via point 9 of LP03 POWER SUPPLY TROUBLESHOOTING Shunt the resistors RPO5 to RPO7 with 10 K resistor Connect point 9 of LPO3 to the common point of RPO5 CPO6 Connect the base of TP52 to ground to avoid any instabilities Connect the base of TRO8 JR24 to ground forced to standby to avoid any inste COLLECTOR TP20 COLLECTOR TP25 BASE TP22
40. s on the collector of TLO1 when it is tur ned off The driver transformer LLO1 operating in alternating mode ensures saturation of the line power transistor 02 each time the driver stage is turned off Power supply to this part is ensured At startup by the audio supply voltage UA via the transistor 7103 Because the voltage VTU originating from the THT is absent TLO3 is satura ted In steady state by the voltage VP originating from the THT via the diode 0101 NOTES THOMSON CENTRE DE FORMATION TECHNIQUE 31 1105 UB1 LLOB LLO9 EHT COM 1 RL62 65 C fr de PE RL60 faisc 01 08 109 DL62 DL63 4 7 RL61 180V YL11 0120 9 0115 RL16 021 CL20 VP 12 5V 12V YLO4 VTU 0 RL51 0150 TL50 TLO2 2 3 i cf CL CL 5 RL12 14 LLO2 0104 HIR RLO3 LLO3 4 CLOS YLOB de 7 RL08 HFY RLos CLO3 VNP 11V DLO5 DLO3 DEG CL06 EGP pros i Sin 446 RE gt 4 39 VTU 86V EHT OP FAULT to If 0 U 3 6V RL41 THOMSON multimedia Marketing France THOMSON ii e CENTRE DE FORMATION TECHNIQUE 55 Pin 7 positive 100Vc c impulse for Service signals phase and sandcastle The OSD line synchronisation Obtaining the voltage VNP raster after rectificatio
41. star FPL o hasta que el cursor 807 Europe 1BIL X est entre los simbolos lt x gt ROM Defaut Value LFA AGC Minimum noise Minimum de bruit Gerduschminimum Rumore minim Minimo ruido For TX807 Asia only TX807 Europe Off Monitor IF output 38 9 MHz antenna input 203 25 MHz BIII 3mV 1 Set AGC to 00 Adjust for maximum gam of IF signal ROM Defaut Value AGC 1F 7 ORE DELLA REGOLAZIONE PROCEDIMIENTO DE ALINEACION SINTESIS DE TENSION VIDEO SUB MENU RED 00 3F GRN 00 3F BLU 00 3F PEAK Perform the G2 and the Focus settings beforehand Effectuez au pr alable es r glages de G2 et de focus Stellen Sie zuvor G2 und Focus ein Effetuare le regolazioni G2 e del Fuoco innanzitutto Ejecuta de antemano os ajustes G2 y Focus 2 Q 50 Grey scale test pattern white 100 A wei white ROM Defaut Value RED IF GRN 1F BLU IF PEAK WHITE ADJUSTMENT CRT na Pin 68 11 100 Oscillo or colorimeter Notes Adjust separate for PAL SECAM and NTSC AV R gler s par ment pour PAL SECAM et NTSC AV Den Abgleich der Videowerte f r PAL SECAM NTSC AV getrennt durchf hren Regolare separatamente PAL SECAM NTSG AV Realice los ajustes en PAL SECAM NTSC AV por separado HOTEL MENU HOTEL ON ON Ava
42. tion of controls Adjustments Alignement procedure Video amplifier board Teletext board Tuner CTT5045 Schematic Keyboard module Integrated circuits Tuner CTT5000 Schematic and transistors outline Service mode access Basic shematic diagram Chassis printed circuit board Variations between models Picture tube matching TX807 FULL CIRCUIT DESCRIPTION INFORMATION INFORMATIONS INFORMATIONEN INFORMAZIONE INFORMACIONES The table hereafter groups 1 The electronic chassis configuration modules and schematic diagram page numbers 2 The chassis configuration CF Le tableau ci dessous regroupe 1 L environnement electronique de chaque chassis modules et le numero de page o il est d crit 2 La designation des chassis Die nachstehendeT abelle umfa t 1 Die elektronischen Baugruppen Module der Chassis und die Seitenzahl auf der sie beschrieben werden 2 Die Chassisbezeichnung CD La tabella qui di seguito contiene 1 l ambiente elettronico di ogni telaio moduli e i numero di pagina nella quale descritto 2 La descrizione dei telai EI cuadro siguiente agrupa 1 El entorno electr nico de cada chasis m dulos y el numero de p gina donde est descrito 2 La designaci n de los chasis TX807 Mono 14 20 21 DESCRIPTION ADJUSTMENT MAIN MAIN SCHEMA Chassis TX807 VST VOLTAGE SYNTHESIS SYNTHESE DE TENSION SPANNUNGSSYNTHESE SINTESI DI
43. wit ched greater than 6 6V at 12 of IV01 The ON command 20 of IRO1 rrives during these impulses The transistor TP52 is locked on V base 0 V emt ter 5 5V CENTRE DE FORMATION TECHNIQUE DPO1 100 5V UB to 0009 1 115 5V LAW 13 5V 20 Ge UA 5W 20V CP90 RP52 56 RP58 TP52 Q CR BURST 2 1RO1 54 ON 12 5V DP57 Sby 10V THOMSON muitimedia THOMSON Ka Marketing France e e REGULATION The voltages UA and UB are regulated UA informs the anode of the IPO1 photo transducer diode UB informs the error amplifier 50 pin 3 The resulting error voltage is applied t the IPO1 photo transducer cathode It should be noted that an increase of UE results in a reduction in the voltage on the photo transducer cathode The conductivity of the photo transducer transistor is proportional to the current passing through the photo transducer diode The voltage on the terminals of CP24 via RP30 DP30 and the photo transduce transistor is applied to the base of TP21 The components RP54 56 58 and DP30 set the regulation range When the energy recuperated from is low the voltage on the terminals o CP24 is insufficient to make DP30 conducting Consequently the conductivity TP20 increases and recuperated energy is increased SAFETY The zener diode DP27 limits the grid voltage of the TP20 switching supply The zener diode DP21 limits the grid su
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