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Service Manual

1. 5067419000 Choke 110 uH Choke 110 RH 5000678510 RGB cpl PHILIPS CRT Modulo RGB cpl cinescopio PHILIPS 5000678500 RGB cpl VIDEOCOLOR CRT Modulo RGB cpl cinescopio VIDEOC 5054001000 Resistor 1 Ohm 2W Resistenza 1 Ohm 2W 5061002100 Diode BAV 21 A52A Diodo BAV 21 A52A 5061111320 Diode 1N 4007 Diodo 1N 4007 5061112050 Diode BAS 321 Diodo BAS 32 L 5061281050 Diode BAV 203 6518 Diodo BAV 203 GS18 5062528230 Transistor BD 230 Transistor BD 230 B 5062528240 Transistor BD 231 B Transistor BD 231 B 5062607200 Transistor BF 720 115 Transistor BF 720 115 5062608500 Transistor BC 847 Transistor BC 847 B 5062608600 Transistor BC 857 Transistor BC 857 B 5062620000 Transistor BSV52 215 Transistor BSV52 215 5063161080 TDA 6108JF N1 TDA 6108JF N1 5070001200 CRT socket Zoccolo cinescopio 5000530210 100Hz Features Modulo Features 100 2 5061112050 Diode BAS 321 Diodo BAS 32 L 5061500400 Diode BBY40 T1 Diodo BBY40 T1 5061515500 Diode BZV55C3V6 Diodo BZV55C3V6 5061518010 Diode BAS16 T1 Diodo BAS16 T1 5062605500 Transistor BF 550 T1 Transistor BF 550 T1 5062608500 Transistor 847 B Transistor BC 847 B 5062608600 Transistor BC 857 T
2. 8000 16 9 32 Modulo Power 8000 16 9 32 cpl 5000568820 Power 8000 16 9 28 cpl Modulo Power 8000 16 9 28 PH cpl 5044010100 Fusible resistor 1 Ohm NFR25 Resistenza sicurezza 1 Ohm NFR25 5044010470 Fusible resistor 4 7 Ohm 25 Resistenza sicurezza 4 7 Ohm NFR25 5048002200 Fusible resistor 2 2 Ohm NFR25H Resistenza sicurezza 2 2 Ohm NFR25H 5048033000 Fusible resistor 33 Ohm NFR25H Resistenza sicurezza 33 Ohm NFR25H 5048147000 Fusible resistor 470 Ohm NFR25H Resistenza sicurezza 470 Ohm NFR25H 5053051000 Safety resistor 1MOhm VR37 Resistenza 1 MOhm VR37 5053210700 Safety resistor 4M7Ohm VR68 Resistenza 4M7 Ohm VR68 5054000150 Wire wound resistor 0 15 Ohm 3W Resistenza a filo 0 15 Ohm 3W 5054001000 Resistor 1 Ohm 2W Resistenza 1 Ohm 2W 5054004700 Resistor 4 7 Ohm 2W Resistenza 4 7 Ohm 2W 054115000 Resistor 150 Ohm 2W Resistenza 150 Ohm 2W 5054347000 Resistor 47 2W Resistenza 47 2W 5055492270 Resistor 27 KOhm 7W Resistenza 27 KOhm 7W 5056590200 resistor 4 7 Ohm Resistenza NTC 4 7 Ohm 5056591100 12 Resistenza 12A 5061002100 Diode BAV 21 A52A Diodo BAV 21 A52A 5061111320 Diode 1N 4007 Diodo 1N 4007 5061112050 Diode BAS 32L Diodo BAS 32L 5061281050
3. Zener diode 3V3 Diodo zener 3V3 5061706800 Zener diode 6V8 Diodo zener 6V8 5061713300 Zener diode 33V Diodo zener 33V 5062608500 Transistor BC 847 Transistor BC 847 B 5062608600 Transistor BC 857 Transistor BC 857 5063126160 TDA 2616 1 TDA 2616 N1 5063198700 TDA 9870A no TDA 9870A Nicam 5063198750 TDA9875A V2 Nicam TDA 9875A V2 Nicam 5063286160 EEPROM M24C16 BN6 EEPROM M24C16 BN6 5063342700 EPROM M27C4001 80XF1 EPROM M27C4001 80XF1 5063344400 MSM514400D 60 MSM514400D 60 5063362060 M30612SFP M30612SFP 5063363190 M51953BFP M51953BFP 5063377100 SAA 7710 104 3 Pro Logic only SAA 7710 104 3 Pro Logic solo 5063552730 SDA 5273 2P SDA 5273 2 5063570530 TDA 7053AT N2 118 TDA 7053AT N2 118 5063593200 TDA 9321H N1 T3 TDA 9321H N1 T3 5063593310 TDA 9332H N1 T3 1 9332 1 73 1 5020030000 9332H N2 T3 2Y TDA 9332H N2 T3 2Y 5066900150 Quarz 3 58 Mhz Quarzo 3 58 Mhz 5066900250 Quarz 4 43 Mhz Quarzo 4 43 Mhz 5066900400 Quarz 10 Mhz Quarzo 10 Mhz 5066902040 Quarz 20 48
4. Diode BAV 203 6518 Diodo BAV 203 GS18 5061301360 Diode BYW 36 Diodo BYW 36 5061401370 Diode BYD 37K T1 Diodo BYD 37K T1 5061503750 Diode BYD37J 115 Pagina 2 Diodo BYD37J 115 DP16 DP24 5061706200 Zener diode 6V2 Diodo zener 6V2 5061909350 Zener diode BZT03 C51 A52A Diodo zener BZT03 C51 A52A 5061703300 Zener diode 3V3 Diodo zener 3V3 5061011000 Bridge rectifier B250D Diodo ponte B250D 5061270000 Bridge rectifier B380C3200 2200 Diodo ponte B380C3200 2200 5061299080 Diode BYW 80PI 200 Diodo BYW 80PI 200 5061299120 Diode BYT 12PI 1000 Diodo BYT 12PI 1000 5061303800 Diode BYV 98 200 Diodo BYV 98 200 5061316870 Diode BY 228 Diodo BY 228 5061316900 Diode BY 229 800 Diodo BY 229F 800 5061319200 Diode BY 459 1500 Diodo BY 459X 1500 5061401480 Triac BTA 08 700CW Triac BTA 08 700CW 5062520300 Transistor BC 635 16 Transistor BC 635 16 5062608500 Transistor BC 847 Transistor BC 847 5062608600 Transistor BC 857 Transistor BC 857 5062756700 Transistor STH 7 80 FI Transistor STH 7NA80 FI 5062764100 Transistor BUH 1015 HI Transistor BUH 1015 HI 5062815480 Transistor STP 12 Transistor STP 12 5063164520 2262 2262 5063249500 I C LE 50C
5. El 5 TO pin 18 CW42 cw32 100 35V L 22n 22n CK zwi BZV55C 3V3 1000u 35V CW49 CW45 Cep 35v 560n CW47 560n H A PRO LOGIC ONLY TWI BC847B cw35 100u 16V FHI cw36 5 12 1 n 3 LINE OUT TW4 BC847B Q TO CNR2 TW5 3 ICS3 9 SIGNAL 8578 9 TDA7053AT Chassis Professional 8000 Audio Power Rev 1 3 Pg 6 13 095418000 TO FRONT END TO AUDIO POWER SCART ANOY4VWOYHI ANO33S8AD ANO3J4 215195 T l S TO CNH3 KEYBOARD Ino SM Seen 1007 308 Sege 8918 cino viva 85145 zino viva Lino viva ISSA ENI 328 INIdSQ ENI SM ZNIdSG zN viva tinodsa IN VIVO 54 SAA7710T IN S 2100454 ZSSA INI NVOSL TAX ov IVLX 1 1 755 13534 454 52017 457 02 859 4054 5201 951 FA dzz 650 dr i CS17 220 CS18 220p CS82 p 220p CS81 220 652 0 10 584 530 10 PRO LOGIC ONLY 051 24 576MHz 0 VIVONVIIN INOYINIT 1N073N17 An07INIVM 1n03NIVM 1noxnv 1nouxnv 1 INOUZAY 5 TDA9870A 2 1 x S gt lt E o lt a JnoylAY 10545 NITZAV NIONOM 445 MILAN NIJIAY 331 39 n Di 5 H
6. Mhz Quarzo 20 48 Mhz 5066902450 Quarz 24 576 Mhz Pagina 1 Quarzo 24 576 Mhz 5066903680 Quarz 36 864 Mhz Quarz 36 864 Mhz 5067322000 SAW Filter K3953M Filtro SAW K3953M 5067322500 SAW Filter 9453 Filtro SAW K9453M 5067330610 Ceramic resonator CSTCS 12 0MT Risuonatore ceramico CSTCS 12 0MT 5067401050 Ceramic filter TPS 5 5 MWA Filtro ceramico TPS 5 5 MWA 5067408200 Coil P3691NAS A41 Bobina P3691NAS A41 5069023200 Tuner UV 1316 AI2 Tuner UV 1316 Al2 5071013400 Ext Speaker connector Presa x altop esterno 5071014800 Double SCART connector Presa SCART doppia 5071015400 Line out RCA connector Presa RCA line out 5087170000 Chassis holder side Staffa supporto telaio 5087178100 Chassis rear connector cover Sfondo posteriore 5087178500 Chassis holder front Supporto telaio anteriore 5000568500 Power 8000 4 3 25 PH Modulo Power 8000 4 3 25 cpl 5000568510 Power 8000 4 3 28 PH Modulo Power 8000 4 3 28 5000568520 Power 8000 4 3 29 PH cpl Modulo Power 8000 4 3 29 PH 5000568530 Power 8000 4 3 34 VI Modulo Power 8000 4 3 34 VI cpl 5000568800 8000 16 9 28 Modulo Power 8000 16 9 28 cpl 5000568810
7. Mmmm Jem tm L DERE 5 I 1 V Div 10 us Div 111111117 rein Ld LE ILLI 20 V Div 10 us Div ibl d ua AN IN A VL II SERESSEESS A 5 V Div 5 us Div 2 VDiv 5 us Div 500 mV Div 10 us Div 3 1V Div 10 us Div EI TIT AL I PUW VEM 9 100 V Div 5 us Div QT hi 1 O 12 100 5 us Div 15 1 V Div 5 ms Div Oscillograms Chassis Professional 8000 2 5 Ll LER LL h mr ss sms 16 1 V Div 10 us Div Hee BEJA EI EN ITT CH aaa 19 200 V Div 10 25 50 V Div 10 us Div 28 5 V Div 10 us Div 0v LET IIT II 5 V Div 10 us Div 20 5 V Div 5 ms Div 23 10 V Div 5 ms Div 26 50 Viv 5ms Div ila ma 29 1V Div 10 us Div SDEERBIBEHE 18 2 VDiv 10 us Div Uu Hi IT IT 21 50 V Div 10 us Div I Ai III T SIISE m 10 V Div 10 us Div pe p I ll EE Me LEE 27 50 VDiv 10 us Div 30 1V Div 10 us Div O
8. the symmetrical driving currents provided by ICC1 Pin 8 is an output which switches to the value H at vertical flyback This signal is connected to pin 9 of ICC1 and is used to protect the CRT in the event of failure of the vertical deflection circuits Two separate supply voltages are used for the deflection part pin 3 and for generating the flyback pulse pin 6 thereby achieving a high value of efficiency The power stage for EW correction consists of transistor TG1 which is driven directly by ICC1 and whose collector is connected to the injection coil LG2 by means of RG4 Audio signal processing The various audio functions are treated by the circuits TDA9870 5A ICS1 SAA7710T ICS4 TDA7467D ICS5 TDA2616 ICS2 ICS6 TDA7053AT ICS3 TDA 9870A TDA 9875A The integrated circuits have the same basic functions the version TDA9875A additionally contains a complete NICAM digital audio decoder The audio IF signal from pin 5 of ICC2 is applied to input pin 12 The AM audio signal in the case of L L standard is also extracted by way of the transistor TS1 and the low pass filter formed by RS34 and 513 and is taken to input pin 29 A second IF input 10 is used for the audio signal of the satellite receiver if present All audio functions demodulation stereo NICAM decoding input output switching volume tone control effects for BG DK I LL standards are contained in the integrated circuit and are totally select
9. 000000 E TO FRONT END 5 Q z 5 o CNC12 1 51 CC17 CCi9 100n 100n TO CNP3 POWER PCB IIO N CRTSPOT CC6 100n XTALI CC7 100n 19 CC43 2 2 100u 16V cc31 CC4 BANDGAP P1 ICC1 100n VDRV CC29 22n TDA 9332 H IREF VSAW CC27 100n 2x CNF1 DYNPHA POWER PCB HFLY DC2 ZC3 BAS32L 1H 2H DIGIDECOUP SAND100 Chassis Professional 8000 Back End Rev 1 2 Pg 9 13 5095418000 TO CNC9 SIGNAL JF1 FOR 100Hz ONLY 5095418000 DL3 103 cra dt 1000u 25V T TL CFS 100n TG1 STP12NB30FP CF7 10 100V ele SE M M En 100n 63V DEA BAV103 DF2 BAV103 OF3 BAV103 DL4 459 1500 DL5 BY229F 800 I CF9 10n 100V CF13 2R2 100 100V ZF1 BZTO3 C51 I cun 4n7 250V CL12 220p 2KV CL14 10n oan 5 202 250 RP26 100K LL6 250uH W76ERF031X044 W76EJY011X121 A80EFF002X43 W66ERF041X044 W76ERF042X044 10R_2W CL15 100 250V 1 DYN FOCUS O Focus 2 ONLY O FOCUS 1 062 140V CL20 4 220n 63V 211 BZTO3 C51 0115 105 A 4R7 017 CL17 E cio 250V 330p 630V M D BYD37K tL om 100u 100 M 330p DL9 BYD37K cL22 330p ikv 8888888 2 ag FE as a RL25 TSP18 TO CNV2 CRT PCB AQUA HEATER HEATER TO CNZ3 DYN FOCUS 4
10. 023 TPS BC857B SIGNAL PCB 1 Ts JP1 qq 2 CP60 CP61 tu 1000u 10V DP15 BAS32L lt 27 AG6EAK071X44 140V 00 Ea BLO1RN1 A62T5 01 AGGEMZA3X51 140 Kc BLO1RN1 A62T5 01 W66ESF002X44 W76EGV023X522 P BLO1RN1 A62T5 01 se v Cen e Z uomo Dee pep WI eem en ee A68ERF031X044 Chassis Professional 8000 Power Supply Rev 1 8 Pg 11 13 TO CNCT SIGNAL OFF 11 evi cv20 100 250V 22u 250V TOR IW t cv21 10u 100 TOn 100V CVI8 CV8 CV24 47u 16 100 220 TO BVM COIL OPTIONAL HEATER 19 212 250V POWER PCB LN cvi2 Ton 220R BAS32L Rv12 Chassis Professional 8000 Rgb 8000 Rev 1 3 Pg 12 13 5095418000 5095418000 TO CNFS POWER PCB TO CNF4 POWER PCB TO DEFL YOKE 275 BZT03C51 100R TZ2 BC847 h 1 212 470u 25V 100n 079 BYD37J 0710 BYD37J cz 3 214 470u 25V 100n CZ2 100n M h L 0716 0716 1072 100n 47u 16V L7912CV 217 718 100 47 16V Cz19 DZ6 BYD37J 100 DZ3 BYD37K BYD37K TO DEFL YOKE OPTIONAL J CZ9 Chassis Professional 8000 Dynamic focus 1 0 4 13 13 Oscillograms Chassis Professional 8000 1 5 1 1 V Div 10 us Div 7 100 5 us Div 13 2 V Div 10 us Div
11. 0R 10 CY57 FA RSS cys 9 39p CY56 gt RANT 100n Y100 m 5 lo TDA9176 im m BC857B 220R RY18 ate 10u 10V OPTIONAL cyn II ICY4 SAA4955TJ SAA4958TJ TO CNC6 SIGNAL PCB Chassis Professional 8000 100 Hz Feature Box Rev 1 4 Pg 4 13 5095418000 ZRI BZV55C 3V3 Gem 8 1K CRIS 15 20 4802 ca CRI6 15 5095418000 LR1 1025 ICRS SDA5273 2P 126 27128 18 17 14 ICR4 M5M44400BJ Ca 1000 10 DN TAOIN TXD1 RXDI RTS1 CTS1 START 7 ICR3 ST24W16 1 2 4 as ICR1 M30612SFP 14 78 79 CR49 CR47 QR 2cr48 100p ES T gt 100n 8 TSP13 TSP14 5 15 TO CNH7 amp KEYBOARD PCB TsP20 gt en TSP21 TSP22 gt lt OPTIONAL CTSO RTSO Gi gt o lo co EI N N o yor zi lo S 2 04 0 od od 85 JR2 NOT FOR 27 801 JR3 27C2001 ONLY 27C801 ONLY 27 4001 270801 ONLY ICR2 27C2001 or 27 4001 or 27 801 TO AUDIO POWER Chassis Professional 8000 Text And Cpu Rev 1 1 Pg 5 13 TO CPU TEXT TO AUDIO CW57 47u 16V lt TO CNB1 WOOFER BOOSTER TSP10 1 RD FRONT QL cw I Iw 1 2208 470p RAVIOUT A RAV2OUT 1000 35V TOR LAVIN LAV2IN TDA2616 0 12 OR 7 oun 9 CW29 1000u 35V mE Sr 1 JE
12. 19 are connected directly to the cathodes via the protection resistors RV5 RV7 RV10 A copy of the currents flowing in the CRT s cathodes are available at pin 5 and this information is sent to the video processor TDA9332H for automatic cut off control circuit operation Transistors TV1 and TV4 form a circuit which serves to eliminate CRT spot formation when the appliance is turned off During operation the heater s supply pulses which are rectified and filtered by DV6 and CV6 keep TV1 saturated and hence inhibit TVA The capacitor CV19 is therefore able to charge up at the voltage of 200V by way of RV19 and DV10 Grids 1 G1 of the tube remain at ground potential since DV10 is conducting As soon as the appliance is turned off the final line stage stops providing the heater s power supply pulses TV1 is inhibited and TV4 is saturated by the 200V voltage still present and applied at its base via RV18 The collector of TV4 grounds the positive armature of CV19 As a result grids 1 of the CRT are polarised with the negative 200V voltage present on its negative armature since the diode DV10 is now polarised the other way round This way the CRT is completely inhibited for the time it takes CV19 to discharge thus preventing spot formation The RGB signals decoupled by means of the transistors TV7 TV8 TV9 are added together and transferred to the power stage made up of TV5 and TV6 by means of the circuit made up of TV2 and TV3 The c
13. 7H 1fH 2fH converter The signals Y50 U50 V50 coming from ICC2 are connected to input pins 26 28 and 30 while the horizontal HA and vertical VA synchronising signals are connected to pins 22 and 20 respectively To double the field frequency 100 Hz it is necessary to write the same original field twice on the screen For this purpose the incoming video signals are first digitalised by sampling them at 8 bits and then transferred to a memory ICY4 from which they are read at double speed Digital to analog reconversion is then performed and the double frequency analog signals are available at pins 79 76 and 74 The circuits formed by TY1 TY2 TY3 TY4 TY5 TY6 adapt the levels for the ICC1 inputs It is also necessary to generate the HD VD synchronising pulses at double frequency and synchronous to those of the original HA VA signal This is done with the help of the PLL circuit made up of ICY2 and ICY3 All checks and signals needed for the various functions and for memory management inside ICY1 which also contains a microcontroller and resident software to carry out the various activities The transistors TY8 TY9 form the reset circuit for this microcontroller The integrated circuit ICY9 switches the synchronising signals between the internal source pins 2 and 5 and the input pins 3 and 6 Switching is controlled by pin 3 of ICY1 The integrated circuit ICY5 if present increases the definition by acting on t
14. I g AOL t 0952 aa 272 ISI 1 INOZAVY 1 ASL znz AOL 6250 IS INOLAVY o lt 47 10 A NIZAV1 NICAVM NILAVY q 0597 220 SRS ONLY CS99 220n 1001 470p 4n7 27n III T 6515 0516 CS87 588 CS89 CS90 1001 M QN9I9IQ 105 vas QNOVNV TDA7467D 55 Chassis Professional 8000 CS93 594 100n Zu 05102 100n 9L 01S9 EEE LSB 15 S095418000 TO AUDIO TO BACK END CC44 66 2u2 16V 22n T PLL o SECAMPLL CVBS PIP OUT CVBS20UT DIGIGND BANDGAPDEC XTAL4 43 o c c o gt 5 EJ XTALPALN CHROMACOMB XTALPALM YCOMB XTALNTSCM SYSTEM2 ue TO CN COMB FILTER TDA9321H CvBSCOMB 26 SYSTEMI CC71 1n CHROMAFRONTIN CVBS YFRONTIN 6072 1000 Sw2 CHROMA2IN CVBS2 YIN 57 100n a GROUPDELAYOUT CVBSSAT GROUPDELAYIN 2 2 o o o lt e lt 8 gt gt 0 CVBSINTIN TC8 BC847B D CVBSTXT LC11 A601S CVBSIOUT CC56 CVBSSAT CVBSFRONT CHROMAFRONT FH CC34 47u 10V Lt SW2 SCART 1 OUT SW SIF AM TUC1 UV1316 AS Chassis Professional 8000 Front End Rev 1 1 Pg 8 13 5095418000 TO CN TO CN TO CNY2 FEATURES BOX FEATURES BOX 2a r Ssmnntoon co O 4 0 z f o r 0 o 9 0 o 0000000
15. NO MAINS VOLTAGE TO CNP1 I 1 1 1 1 POWER PCB 1 SEPARATION IN THIS AREA Chassis Professional 8000 Keyboard PCB Rev 1 1 5095418000 Pg 1 13 TO CNS7 SIGNAL PCB TO CENTRE SPEAKERS FROM CNS4 SIGNAL PCB OPTIONAL 5095418000 ICB1A 1 2LM358N lt CB6 100n H CB16 0 10 16V ICB3 L78L12CZ 4 C87 12204 sov TO CABINET SPEAKERS TO TSP34 SIGNAL PCB ICBIB 1 2LM358N CBIO 2 100 25V 2 2 220 DUT ICB2 TDA2616 vP 0072 WI 100n 50V TO WOOFER SPEAKER Chassis Professional Woofer Box Amplifier 8000 Rev 1 3 Pg 2 13 5095418000 SA CM 74HCT86 ICM3 74HCT4538N Pes LMI 6015 CNM3 gt 3 1 1 V_VGA VGA_ENABLE 5 RMG TO CNS2 SIGNAL PCB Chassis Professional 8000 Vga Interface Rev 1 3 Pg 3 13 LY6 6015 TO CNM2 INTERFACE v 50 2 1 ICY7 L4931 CDT33 LY7 6015 CY35 LY8 10u 10V 6015 9 2 74HCTI57 74HCTO4D ENABLE gt CY52 10 DY6 BAS32L SELECT i Ka U ICY6 DI m 2 178105 5 74HCT4046AD DY5 BAS32L 3 n a ICYB DNR T 2 178105 s S 1 LY9 10u 10V 6015 RY39 8 2 E Di 78 77 76 70 69 68 67 66 65 H 5 N SN lt o Je Jo Ta TY4 DA ens BC857B 100 10V BC847B 220R 18
16. R7 R82 NFR25H 4R7 NFR25H 4R7 1R 4K7 NFR25H R FUSE 1 4W 14W 1 4R7 NFR25H 3K9 270K 1R2 FSOERERSENEE tw ww a AECILCLZ 4R7 4K7 330K 1R2 COEIERAERETE w aw AE elteren 4R7 AR 4K7 220K 1R 74 w w srt anno 4R7 AR 220K 1R 3R3 NFR25H R FUSE 1 4W 1 4 Iw 1w Chassis Professional 8000 Deflections Rev 1 10 Pg 10 15 CP73 10 585 CP72 In 1KV o z a m E n D CP6 CP7 In An n KV A CP3 220n P P gt 2 T3 15AH aw aa TO CNH6 KEYBOARD DEGAUSS al PRIMARY GROUND CAUTION NO MAINS VOLTAGE SEPARATION IN THIS AREA 5095418000 DP5 DP6 LP10 2 x 28 600 LAN BTA_08_700cw TEA 2262 DP17 BAV103 ZP1 BZD142W 160 GND ICP10 OSC 20 DIP DRAIN COMP 220K 1W o 7 STW7NB80 220p CP16 470u 50 5 DP14 4n7 50V BYD37K x DP13 BAV103 231 sv OPTION th cen 100 10V L 1 CP30 100u 16V 100n DP8 2 1000 CP36 37 CP38 100p 100 250 100n 250V CP41 T 100n ICP6 LP8 L7812CV TSP12 TSP13 DPIO 100uH 5 CP4B BYWBOPI 200 10 47 16V T 7 17808 L TSP14 LP6 16V 1 2 n u 85 TO CNCB CP53 100p kV 000 16V DP24 BZV55C6V2 ICP3 TLP 3
17. Z I C LE 50CZ AP 5063410300 I C K 3023 P I C K 3023 P S063411010 I C TCD T 1102 GB TCD T 1102 GB S063183510 I C TDA 8351 N6 I C TDA 8351 N6 S063209700 I C L 78S05 CV I C L 7808CV S063210500 I C L 7808CV I C L 7808CV S063210520 I C L 7812CV I C L 7812CV S063240000 VIPER 20A DIP VIPER 20 5070503900 Fuse T2 5A Fusibile T2 5A 5070503940 Fuse T4A Fusibile T4A 5070504000 Fuse T315 mA Fusibile T315 mA 5070506500 Fuse 3 15A Fusibile T 3 15A 5017120000 Condensator 220 pF 1000V Condensatore 220 pF 1000V 5020222000 Condensator 2K2 pF 4000V Condensatore 2K2 pF 4000V 5040780100 Condensator 10 uF 385V Condensatore 10 uF 385V 5040781500 Condensator 150 385V Condensatore 150 uF 385 V 5065624000 Flyback transformer Trasformatore EAT 5031010010 Flyback transformer Dynamic focus Trasformatore EAT Dynamic focus 5065701100 Stand by transformer Trasformatore Stand by 5065706100 Power supply transformer Trasformatore di alimentazione 5066541750 Mains filter Filtro rete 5066548000 Line driver transformer Trasformatore di riga 5067070800 E W Coil Bobina E W 5030040020 Bridge Coil Pagina 3 Bobina ponte 5067081440 Linearity coil Bobina linearit
18. al driving output progressively switches to its rated frequency 32 kHz and the steady state operating mode is reached The software now disconnects the power supply voltage from pin 22 The transistor TC4 is normally inhibited because its base via RC34 is connected to earth by the jumper JF1 situated on the power supply deflection circuit and this level L is also carried to pin 26 of the microcontroller This also allows the correct operating frequency of ICC1 32 kHz L 15 kHz to be provided via pin 12 which also depends on the deflection hardware used The horizontal HD and vertical VD synchronising pulses are applied to input pin 24 and 23 respectively Pin 13 is the input of the horizontal flyback pulse and pin 4 is the input for dimensional stabilisation of the image as the tube current varies Pin 9 is used as input to protect the tube blancking it out in the event of a fault in the vertical deflection circuits Pins 1 and 2 are the symmetrical outputs for vertical driving and pin 3 is the output for E W correction control All the adjustments are performed in service mode by a special support software program Video final amplifiers The RGB signals available at pins 40 41 42 on ICC1 TDA9332H must be amplified and inverted in order to reach the level required for driving the CRT The integrated circuit TDA6108 ICV1 is used for this purpose The final amplifier inputs are connected to pins 1 2 3 and the outputs pins 7 8
19. de of 2 Vpp at pin 10 and is applied via the audio carrier suppression filter FCC3 to pin 12 which represents the input of the group delay correction circuit controlled by software After this treatment the signal is available at pin 13 with an amplitude of 2 Vpp From here it is sent both to the SCART 1 output and to one of the video selector inputs pin 14 after being taken to the level of 1 Vpp Further video inputs are available at pins 16 AV1 18 SAT 20 AV2 and 23 FRONT S VHS sources whose chrominance signals are connected to pins 21 and 24 can also be connected to the AV2 and FRONT inputs respectively The video signal of the selected source is taken from pin 26 to power the teletext decoder In order to send the selected signal to the screen it is routed internally through a band pass filter to remove the chrominance signal and a trap to eliminate the colour subcarrier from the luminance signal In the case of SVHS sources these circuits are bypassed Switched capacitance circuits are also included for creating luminance delay lines The chrominance signal is demodulated in accordance with the PAL SECAM NTSC standard identified automatically and with the aid of integrated delay lines The carrier reconstruction oscillators are connected to their respective crystals via pins 54 and 57 Original spare parts must be used for these components as all the functions of the integrated circuit take their frequencies as reference After
20. ed and controlled via software The audio inputs from the SCART 1 and SCART 2 sockets are connected to pins 33 34 and 36 37 respectively while the audio input from the front RCA sockets optional is connected to pins 31 32 Pins 47 48 and 51 52 are the outputs towards the SCART 1 and 5 2 sockets respectively Pins 62 63 are the constant level outputs for the LINE OUT sockets fed by the transistors TW11 and TW13 pins 60 61 are the outputs for the loudspeaker power amplifiers ICS2 Pins 22 23 25 26 27 are the inputs outputs of the 125 digital bus used for communications with ICS4 present only in Dolby Pro Logic appliances e SAA 7710T This is present only in appliances equipped with Dolby Pro Logic decoding and also provides the function of a 5 band audio equaliser Signal treatment is fully digital and data transfer to and from ICS1 is performed via the bus 125 which is connected to pins 22 23 24 28 29 A specific software program is responsible for complete management of all functions including a special spatial sound Incredible Sound which offers effects similar to Pro Logic decoding without the need to install rear loudspeakers e TDA 7467D 55 be used as an alternative to the Dolby Pro Logic decoder ICS4 This creates special spatial sound effects while using solely the loudspeakers contained in the appliance The input signal to be processed is connected to the pins 2 3 and the outputs are connected to pin
21. er PM1 is factory set It requires special equipment for adjustment and its setting must not be altered If the value of the horizontal frequency is not correct pin 10 of ICM3 is kept at level L consequently the communication line with the microcontroller VGA ENABLE goes to about 2 5 V This information is used to generate a specific error message The integrated circuit ICM4 switches between VGA and front RCA audio sources and the transistors TM1 TM2 TM3 TMA adapt the VGA audio level to that inside the TV set Spare parts list Lista parti di ricambio Ref pos Description Chassis Professional 8000 Rev 1 2 Descrizione 5000558000 Front End 8000 Base Front End 8000 5000558750 Front End 8000 Nicam Dolby cpl Base Front End 8000 Nicam Dolby cpl 5000558500 Front End 8000 Nicam Base Front End 8000 Nicam cpl 5000558250 Front End 8000 Dolby cpl Base Front End 8000 Dolby cpl 5047501000 Fusible resistor 1 Ohm Resistenza sicurezza 1 Ohm 5047502200 Fusible resistor 2 2 Ohm Resistenza sicurezza 2 2 Ohm 5047504700 Fusible resistor 4 7 Ohm Resistenza sicurezza 4 7 Ohm 5055408020 Wire wound resistor 1 Ohm 7W Resistenza a filo 1 Ohm 7W 5061112050 Diode BAS 321 Diodo BAS 32 L 5061517920 Diode 792 1 Diodo BA792 T1 5061518100 Diode 581 Diodo BAS81 5061703300
22. ervice Manual Chassis Professional 8000 Service notes After a repair the cables must be laid out as originally fitted to save compliance with original approval and to avoid failures or disturbances The mains cable prevents interference from the mains supply and is part of the product approval For replacement the original spare part only must be used Note di servizio Dopo una riparazione i cavi devono essere disposti come posizionati all origine per mantenere la corrispondenza con le approvazioni originali ed evitare guasti o disturbi Il cavo di alimentazione previene interferenze provenienti dalla rete elettrica ed parte delle approvazioni del prodotto Per la sostituzione deve essere utilizzato esclusivamente il ricambio originale Modifications reserved Con riserva di modifiche Service procedure for Chassis Professional 8000 Power supply Adjust PP1 for 140 V 0 5 V across CP37 Entering service mode 1 Turn on the appliance at the mains switch while holding down the MENU key on the local control until the red LED lights up 2 Release the MENU key on the local control and press the stand by key on the remote control The appliance will start up in service mode with a specific support menu 3 The various functions can be selected using the P keys on the remote control and the adjustment can be made using the Volume keys It is advisable to make a note of the initial value before making the adjustment s
23. evant to operation in the memory In addition to user option data tuning analogue levels etc memory ICR3 also contains data regarding the settings of many of the appliance s functions such as geometries option bytes white level adjustment etc If the memory is replaced these settings must be restored through the appropriate service procedures However the program contains special check routines so the appliance can be turned on when the memory is not programmed or even not present thereby simplifying the service procedures Video signal processing deflection The various items of information in the video signal are processed by the integrated circuits TDA9321H ICC2 TDA9332H ICC1 and SAA4977H ICY1 TDA9321H Video The IF signal from the tuner whose band is limited by the surface wave filter FCC5 is routed to pins 2 3 which are connected to the input of the video demodulator synchronous PLL type with active carrier regeneration This assures ultralinear demodulation an excellent demodulation figure a low harmonic content and an excellent impulsive response The only residual adjustment that must be carried out on the video demodulation circuits is tuning of coil LC9 of the VCO oscillator and setting the working point of the tuner AGC which is controlled by way of pin 62 Both the adjustments are performed fully automatically by the software in service mode The baseband video signal is available with an amplitu
24. he signal s transient fronts e TDA9332H Video Signals Y100 U100 and V100 from the 100Hz conversion module are connected to pins 26 27 and 28 The RGB signals for performing saturation contrast and brightness controls are restored by way of the matrix circuits The signals for driving the video final amplifiers are therefore available on output pins 40 41 and 42 Pin 44 is the input for the measurement pulses for adjusting the cut off which uses an automatic system for alignment at both low and high current thereby optimising the performance of the tube Adjustment of voltage Vg2 is fully automated in service mode by a special software procedure Pin 43 is the control input for automatic limitation of the tube current Pins 35 36 37 and 38 are the inputs of the RGB signals for the OSD and teletext while pins 30 31 32 and 33 are the RGB inputs of the VGA source These inputs require sources with a horizontal frequency of 32 kHz Deflection The entire management of the deflection controls refers to the 12 MHz oscillator FCC1 connected to pins 20 21 When turned on the transistor TC3 is made to conduct by pin 1 of microcontroller ICR1 thereby powering pin 22 This activates the output of horizontal driving pulses from pin 8 at a frequency of about 50 kHz This starts the horizontal deflection stage whose consumption permits stabilisation of the power supply When the power supply voltage on pins 17 39 reaches 8V the horizont
25. indings In stand by the TRIAC DP2 does not conduct so the circuit including the PTC powering the degaussing coil is completely disconnected from the power supply and therefore has no power consumption When it is turned on by means of the photo coupler ICP3 the TRIAC DP2 is made to conduct and the rectified and smoothed mains voltage across CP14 via winding 5 2 of transformer TRP1 is present on the collector of TP1 which does not conduct because ICP1 is not yet powered Simultaneously CP16 is charged from mains via RP3 As soon as the voltage across it reaches a value of about 10 V the integrated circuit begins to operate and generates on pin 14 the driving pulses for making transistor TP1 conduct Current therefore begins to flow in the primary winding 5 2 of the transformer and across the winding 1 7 there are formed pulses which are rectified by DP4 and smoothed by CP16 and ensure a complete power supply of ICP1 At the same time currents are also induced in the secondary windings after being rectified and smoothed these currents generate the various power supply voltages A voltage taken from across CP37 by way of the voltage divider made up of RP35 RP29 RP23 RP33 PP1 is applied to the base of 4 and causes a proportional current to flow in the photodiode contained in the optocoupler ICP2 This value is transferred via the photo coupler emitter to the input pin 6 of ICP1 of a comparator which regulates the duration of the base dr
26. ive pulses of transistor TP1 This controls the time for which current is allowed to flow in the primary winding and therefore regulates the energy fed into the transformer and gives extremely precise stabilisation of the voltages available on the transformer s secondary windings The circuit made up of CP24 CP25 LP10 DP6 controls the current harmonics towards the mains power supply and may be present or absent depending on applicable regulations This solution activates automatic demagnetisation of the CRT every time the appliance is turned on not just from the switch but also from stand by This solves the problem of possible purity degradation if the appliance as often happens is not turned off regularly from the mains switch Protection To protect against supply voltage variations the integrated circuit ICP1 interrupts generation of driving pulses to pin 14 if the voltage at pin 16 is higher than about 15 5 V Furthermore the current that flows in the transistor TP1 is read across RP9 and is applied to pin 3 via RP5 RP14 if it exceeds the maximum permitted value the driving pulses to pin 14 are interrupted This protects the transistor TP1 and safeguards against short circuits in the transformer s secondary windings Microcontroller A latest generation device with 16 bit architecture ICR1 M30612SFP is used supported by an EPROM Electrically Programmable Read Only Memory that contains all the appliance software The variou
27. o that it can easily be restored if necessary If the memory NVM ICR3 is replaced it is essential to carry out all the adjustments required in service mode because the replacement memory is supplied NOT pre programmed If the EPROM ICR2 containing the software is replaced compatibility with the existing NVM is verified automatically and if necessary it is initialised These operations may take some time so you must wait until they are completed Although the individual settings can be accessed and memorised individually and independently it is advisable to carry them out in the sequence in which they appear when pressing the P key Option byte The correct value to be set for each appliance is marked on the label on the back of each item alongside the writing Option byte The value can be entered using the number keys on the remote control AFC setting Connect a generator or a known transmitter of reliable quality to the antenna input and use the remote control number keys to enter the value of its RF frequency which must be within the frequency band indicated by the menu then press OK The setting will be made automatically Repeat the procedure for BG L and L standards If any of the settings are omitted operation automatic search and tuning in this standard may be incorrect AGC tuner setting Connect a generator with an RF level of 1 mV 60 dBuV or a known transmitter of reliable quality to the antenna input and use the
28. oupling capacitor CV13 together with the power stage input impedance forms a differentiator circuit which generates pulses of suitable polarity upon each signal transition This drives a special deflection coil on the CRT which modulates the deflection velocity Beam Velocity Modulation thereby significantly improving image definition Horizontal deflection The output line transistor is driven by the transformer TRL1 whose primary winding is driven by the transistor TL1 connected to the horizontal drive output of ICC1 via the emitter follower TC5 The horizontal deflection stage is carried out in a conventional manner with the deflection transistor TL2 the diode DLA DL5 EW modulation circuit and pin cushion distortion correction CL8 LL6 The correction signal EW is injected into the central point of the diodes via LG2 The capacitive divider formed by CL11 CL12 is used for picking up the horizontal flyback pulse to be applied to pin 13 of ICC1 limiting its maximum value to 8V by means of the diode DL 11 Vertical deflection EW correction These functions are performed by the integrated circuit TDA8351 ICF1 This is power amplifier with a bridge output that allows the vertical deflection coils to be connected directly to pins 4 and 7 The resistances RF9 RF10 which provide pin 9 with the necessary feedback signal are placed in series The differential input circuit pins 1 2 is driven by the voltage formed across RF3 RF4 for
29. pply has come on correctly by checking that pin 18 START is at level H then all the possible peripherals are interrogated via the IIC Bus to recognise the configuration of the appliance and thereby structure the program All data regarding the operating parameters required for correct setting of all the functions tuning analogue values geometries option bytes etc are subsequently called up from the memory ICR3 The various functions are carried out and commands given primarily via the digital buses The functions of the remaining microcontroller pins are described below Pin 1 Output LPW which goes to level L during the main power supply start up to activate initial operation of the horizontal deflection stage Pins 3 4 DAC Digital to Analog Converter outputs for headphone volume and balance control Pin 19 Input connected to vertical flyback pulse used for managing communication timing with 100 Hz processor Pin 20 Output which goes to level H to activate audio power amplifier muting Pin 21 Output for controlling satellite antenna system switching Pins 24 25 Inputs for automatically recognising the configuration of the 100 Hz conversion system Pin 26 Input for automatically recognising correspondence of deflection hardware used Pin 30 Input for automatically recognising the presence of the Comb filter Pins 35 36 37 Outputs reserved for future use Pin 38 Output for controlling loudspeake
30. r configuration in Dolby Pro Logic mode Pin 89 Input used for controlling VGA input enabling Pin 93 Output for controlling illumination of local control LED Pin 94 Output for controlling activation of electromagnetic switch if present Pin 95 Input connected internally to an ADC Analog to Digital Converter to measure the value of the tuner s AGC voltage Pin 97 Input connected internally to ADC Analog to Digital Converter to measure the value of the voltage generated by the local control keys and hence discriminating the control Note that the software also identifies the configuration of the appliance by way of an option code contained the memory ICR3 This option code must therefore be checked and if necessary adjusted if ICR3 is replaced The correct value for each model is marked on the label on the back of each item after the words option code It can be set by entering service mode follow the necessary safety procedures In this mode it is also possible to make all the adjustments for the various calibrations under the control of a specific program contained in the microcontroller which also verifies automatically whether NVM data initialisation operations are required NVM memory ICR3 This is an EEPROM Electrically Erasable Programmable Read Only Memory NVM Non Volatile Memory with a 16K bit capacity and an IIC bus interface The microcontroller writes and reads all the variable data rel
31. ransistor BC 857 B ICY6 ICY8 5063209600 L 78L05ACZ AP I C L 78L05ACZ AP 5063349550 SAA 4955TJ V1 T3 SAA 4955TJ V1 T3 5020020000 SAA 4956TJ V1 T3 SAA 4956TJ V1 T3 5063349770 SAA 4977H V1 T3 SAA 4977H V1 T3 5063367400 M74HCT 04 M74HCT 04 5063367420 M74HCT 157 M74HCT 157 5063549310 L4931 CDT33 L4931 CDT33 5063574400 74 HCT4046AD T3 74 HCT4046AD T3 S067407900 Coil A638AN 0164Z Bobina A638AN 0164Z 5000768000 VGA Modulo VGA cpl 5062608500 Transistor BC 847 Transistor BC 847 5062608600 Transistor BC 857 Transistor BC 857 B 5063574000 74 HC 4053D 653 74 HC 4053D 653 5063574080 I C 74 HCT86 D 74 HCT86 D ICM2 ICMS 5063574450 74 HCT4538D 4 74 HCT4538D 5071020100 RCA connector withe Presa RCA bianca 5071020110 RCA connector red Presa RCA rossa 5071040150 VGA connector Connettore VGA 5000868100 Audio Booster Modulo Audio Booster cpl 5055408020 Wire wound resistor 1 Ohm 7W Resistenza a filo 1 Ohm 7W 5063001800 I C LM 358 N LM 358 N S063126160 I C TDA 2616 N1 TDA 2616 1 5068070900 Relai
32. remote control number keys to enter the value of its frequency which must be within the frequency band indicated by the menu then press OK The setting will be made automatically Screen grid voltage Vg2 Adjust the potentiometer G2 on the transformer EHT until the confirmation message appears No particular signal set up is required Vertical geometry The VS Vertical Slope function must be adjusted in such a way that the central horizontal line in the test signal is exactly on the border between the visible image and the lower black part It must not subsequently be altered Now set the remaining parameters as accurately as possible in the sequence in which they appear Horizontal geometry Adjust as accurately as possible in the sequence in which they appear Adjusting white Red Green Using a B W bar signal adjust to obtain a grey image The blue setting is fixed Exiting service mode Once you have made the necessary adjustments press the OK key on the remote control in one of the menus in which it is active to memorise all the functions and return to normal operation of the appliance CHROMA CHROMA_FRONT CVBS_FRONT R_FRONT L_FRONT TO CNS2 SIGNAL PCB L MONO N ves T Y lt CH6 e T 470p OPTIONAL LHI 8u2 el Bu2 IRHI 50 1736 EARR 3 o M 2 270R EA 1lr 5VSB ANT QS e A 2 1 4 5 6 7 8 9 10 CNH7 TO CNR2 SIGNAL PCB wm DI IE OPTIONAL 2 CAUTION
33. s 1 28 It is fully managed by software e TDA 2616 This is a double Hi Fi audio power amplifier in accordance with DIN45500 ICS2 is always present whereas ICS6 is used solely in Dolby Pro Logic appliances to amplify the central and rear channels The input signals are connected to pins 1 9 and the outputs to pins 4 6 Pin 2 mutes the amplifiers and is controlled via the transistor TW9 The transistors TW12 and TW14 activate MUTE during power supply transients The right and left channel signals are also added together and sent via the transistor TW10 to the woofer box amplifier present in some models only TDA 7053AT This is a double amplifier used to power the headphone socket The inputs are connected to pins 4 6 and the outputs to pins 9 16 The reproduced signal is the same as that of the loudspeakers and its volume and balance can be controlled by way of pins 2 8 connected to the output pins 3 4 of microcontroller ICR1 Woofer amplifier This is present in some models only and is used to power the woofer loudspeaker box The integrated circuit LM358N ICB1A B constitutes a two stage low pass filter in cascade and serves to eliminate all frequencies higher than about 300 Hz from the audio signal spectrum Power amplification is performed by the integrated circuit TDA2616 ICB2 connected in a bridge configuration which directly powers the box loudspeaker The circuit made up of the transistor TB2 and the relay RLB1 is u
34. s SVR 12 Relais SVR 12 Pagina 5
35. s functions are controlled either by changing the logic state L or H of some pins on the microcontroller or by way of a two wire digital bus pins 27 28 designated IIC bus Inter Integrated Circuit Bus An additional IIC bus pins 91 92 is devoted exclusively to dialoguing with the NVM memory Non Volatile Memory ICR3 to provide maximum protection against data corruption Connected to pins 32 33 34 there is also a special high speed M3 L bus dedicated exclusively to dialoguing with ICR5 SDA5273 2P for managing teletext and graphic OSDs On Screen Displays The signal from the IR receiver is applied to pin 7 of the microcontroller which begins its activity when the supply voltage is present and the reset cycle active L at pin 12 has been completed For this reason if the system shows abnormal behaviour it is important to turn the power switch off and back on again to generate a reset pulse allowing the program to be reinitialised When the reset pulse has terminated the microcontroller waits until the control signals from IR are present at pin 7 or those from the local control are present at pin 97 Execution of the entire program is timed by the clock signal generated by the 10 MHz crystal and applied to pins 13 15 A valid command for exiting standby generates a level L at output pin 100 thereby enabling powering up of all the circuits as described in the power supply section The microcontroller first verifies that the power su
36. scillograms Chassis Professional 8000 3 5 31 1 V Div 10 us Div 37 1 V Div 5 ms Div TIE IIT 1 1 1 1 I IC LU LL i i dv ci 11 11 40 2 VDiv 10 us Div DU ei 43 500 mV Div 10 us Div 35 1 V Div 10 us Div 38 2 V Div 10 us Div NIA AL ATA ALI ALLAIT MM VIV IM VI LIST LITTLE QI 1 i PR JLLITSU LIT VA 200 mV Div 50 ns Div 44 1 V Div 20 us Div 45 1 V Div ei 806 00 6 Una ln Jem ue 0 D RI B s 5 SS 36 1 V Div 5 ms Div 39 1V Div 10 us Div 42 2V Div 10 us Div 20 us Div Oscillograms Chassis Professional 8000 4 5 SEIN Jis Her vice LR IT yz 1 V Div 5 ms Div 1V Div 20 us Div R S k l Si zn Bir JL TU Sisa g MD EB Pt tT TT TT yt YT 1 RI 500 mV Div 20 us Div 58 500 mV Div 20 us Div 5 1V Div 20 us Div Oscillograms Chassis Professional 8000 5 5 61 1V Div 10 us Div 62 1V Div 5ms Div 63 1V Div 10 us Div 64 1 V Div 5 ms Div Chassis Professional 8000 Circuit descrip
37. sed solely in Dolby Pro Logic appliances to adapt the internal loudspeaker connections according to the installation configuration chosen by the user from the OSD menu Switching is managed by pin 38 of the microcontroller which directly drives the base of TB2 VGA interface This option present only on some models allows the appliance to be used as a computer monitor at the following VGA resolutions only pixel horizontal vertical 640x480 31 5 kHz 60 Hz 640x350 31 5 kHz 70 Hz 640x400 31 5 kHz 70 Hz The PC s graphic interface must be set for these resolutions The RGB video signals are sent directly to the input pins 30 31 32 of ICC1 while the synchronising signals from pins 13 and 14 of CNM1 are applied to the integrated circuit ICM1 Quad 2 input exclusive OR which provides positive pulses to output pins 3 6 whatever the input polarity This way the appliance is automatically adapted to any type of PC The presence of horizontal and vertical synchronising pulses is checked by means of ICM2 whose output pins 6 and 10 are at level H only if the horizontal and vertical synchronising pulses respectively are present Only in this case pin 2 of CNM3 VGA ENABLE go to level H The integrated circuit ICM3 is used to check that the frequency of the horizontal synchronising pulses is lower than the maximum value set by PM1 to prevent an incorrect PC resolution setting damaging the television s horizontal deflection stages Potentiomet
38. the treatments described above the luminance signal Y50 and the colour difference signals U50 V50 are available on pins 49 50 and 51 respectively There are also two video outputs which can be freely connected to any of the inputs and are used for the SCART2 output pin 34 and for the PIP module pin 32 Pins 25 26 27 28 29 and 30 are used for connection to an optional comb filter The SCART1 RGB input is connected to pins 40 41 42 and 43 and the PIP source Y U V signals to pin 36 37 38 39 Pins 19 and 22 are outputs which can be placed in an H or L level under the control of the software and are used respectively for L L switching of the audio filter FCC4 and for switching of the video signal output on SCART1 by means of the transistors TW3 TWA TW5 TW6 TW7 and TW8 Audio The IF signal from the tuner whose band is limited by the surface wave filter FCCA is routed to pins 63 64 which are connected to the mixer consisting of a multiplier which converts the IF signal to the intercarrier frequency This frequency is available at pin 5 after a high pass filter which eliminates the video content The is also an AM audio demodulator whose output is also connected to pin 5 Deflection The horizontal and vertical synchronising signals are extracted from the screen video signal The horizontal synchronising pulse HA is available at pin 60 the vertical synchronising pulse VA at pin 61 and the sandcastle pulse at pin 59 e SAA497
39. tion Modifications reserved Aenderungen vorbehalten Con riserva di modifiche Power supply Consists of two completely separate sections e Stand by power supply e Main power supply Stand by power supply This is an SMPS Switch Mode Power Supply operating at about 50 kHz with primary side control and stabilisation performed by the integrated circuit VIPer20A ICP10 which provides exclusively the voltages required by the appliance in stand by mode In these conditions the main power supply is completely deactivated which allows for an exceptionally low overall consumption 1 W far lower than even the most stringent standards The transformer TRP2 performs the dual function of isolating the appliance from the mains power supply and generating on the secondary winding the supply voltage 5 Vsb which powers the IR receiver IRH1 the microcontroller ICR1 the NVM memory ICR3 the reset circuit ICR6 and the EPROM ICR2 containing the software A duplicator circuit is used to obtain a voltage of about 20 V used for turning off the electromagnetic mains switch optional Main power supply This is an SMPS Switch Mode Power Supply operating at about 45 kHz with secondary side control and stabilisation performed by the integrated circuit TEA2262 ICP1 The transformer TRP1 performs the dual function of isolating the appliance from the mains power supply and generating the correct supply voltages on the various secondary w

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