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TECHNICAL BULLETIN

10

th

Sep 1999

Page 1 of 1

MODEL:

EU-34T (AK20 CHASSIS)

PROBLEM:

“White Dot Noise” pattern visible on low RF signal input.

File: EU-34T (Whitedot).doc / EU-34T (Whitedot).pdf

White dot noise pattern occurs when signal RF input is too low. This modification will improve the signal/noise
vastly.

Instructions:

1.  Remove C820 (Ceramic Cap 270pF 1KV)

2.  Insert (Ceramic Cap 470pF 1KV) into location C820

3.  Add a 0.22nF 630V capacitor in parallel with D806.

Regards,

Fabian Lubanovic

TEAC Australia Pty Ltd.

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Содержание EU-34T

Страница 1: ......

Страница 2: ...hitedot doc EU 34T Whitedot pdf White dot noise pattern occurs when signal RF input is too low This modification will improve the signal noise vastly Instructions 1 Remove C820 Ceramic Cap 270pF 1KV 2 Insert Ceramic Cap 470pF 1KV into location C820 3 Add a 0 22nF 630V capacitor in parallel with D806 Regards Fabian Lubanovic TEAC Australia Pty Ltd ...

Страница 3: ...n There is an alignment which is the VCO adjustment VL101 The procedure of alignment can be described briefly as follows The IF signal is applied to the IF inputs in accordance with the standards for B G 38 9MHz at pin 1 and 2 of SAW filter Z101 Adjust the VL101 until getting 2 5 V dc at pin 9 of uC IC501 This stage is also used for negative and positive modulated mono applications STV 8224 negati...

Страница 4: ...l is applied to the pin 8 of the IC STV 8224 which is the input of limiter and SIF PLL stage The limiter and SIF PLL output pin 15 which is connected to the deemphasis capacitor drives pin 5 of the IC STV 8225 as FM Sound Input in order to be able to select the appropriate FM or AM audio signal for producing audio out of the scart connector The selected signal at pin 9 of STV8225 drives external a...

Страница 5: ...l is used to adjust vertical positioning at vertical output stage via R701 R703 R704 C701 D701 and Q701 The sandcastle signal at pin 37 is used to control the external baseband chroma delay line STV 2180 IC 402 pin 6 3 1 2 Filters All filters integrated trap filter integrated chroma bandpass integrated bell filter for SECAM integrated delay line are tuned with a reference PLL The PLL consists of a...

Страница 6: ...nsion transformer The 112V supply voltage for the stage is connected at 2 TR601 transformer generates EHT focus and G2 voltages required by picture tube Furthermore the 200V supply for video output 26V supply for vertical output and heater drive current are derived from this transformer The beam current information from pin 8 of TR601 is used for reducing the contrast at excessive long term averag...

Страница 7: ...rding to option diodes configuration D501 D503 D505 D506 D508 The controller has also a software which is able to control some service adjustments R G B gain R G cut off vertical position vertical linearity horizontal position vertical amplitude AGC language selection for teletext For enter to service mode followed procedure must be act within four seconds 1 Press volume down button on the keyboar...

Страница 8: ...073 1 6036 3 5 5 86 21752 3 6 0 352 6625 679 25 3 21 679 25 3 6 0 679 3 6 176 1 679 8 2 28 7 0 81 7 7 8527 7 25 81 7 7 25 8527 7 9 25 7 7 7 237 21 9 2 6 7 5 0 6 352 6625 7 6 7 5 9 2 6281 6 67 0 9 6 7 25 7 25 9 25 6 0 237 21 08 7 6 9 2 7 8 1 5 ...

Страница 9: ...cted back to the power source it is usedas control and power ground 5 Foldback Input The foldback function provides overload protection Feeding the foldback input with aportion of the VCC voltage 1 0V max establishes on the system control loop a foldback characteristic allowing a smoother startup and sharper overload protection Above 1 0V foldback input is inactive 6 Overvoltage Protection When th...

Страница 10: ...ser selectable size n Data RAM 256 bytes n Data EEPROM 384 bytes n 42 Pin Shrink Dual in Line Plastic Package n Up to 22 software programmable general purpose Inputs Outputs including 2 direct LED driving nOutputs n Two Timers each including an 8 bit counter with a 7 bit programable prescaler n Digital Watchdog Fuction n Serial Peripheral Interface SP supporting S BUS I2 C BUS and standart serial ...

Страница 11: ...up Schmitt Trigger Input 22 PA4 I O Open Drain 12V No Input Pull up Schmitt Trigger Input 23 PA5 I O Open Drain 12V No Input Pull up Schmitt Trigger Input 24 PA6 I O Open Drain 12V No Input Pull up Schmitt Trigger Input High Drive 25 PA7 I O Open Drain 12V No Input Pull up Schmitt Trigger Input High Drive 26 PB0 I O Push Pull Software Input Pull up Schmitt Trigger Input 27 PB1 I O Push Pull Softwa...

Страница 12: ...ven below 13 875MHZ Crystal Specificatýon Oscillation Mode Fundamental Parallel Frequency 13 8750 MHz Crystal Frequency Stability 150ppm Maximum Crystal ESR steady state 60 Ohms Maximum Crystal ESR start up 120 Ohms Maximum Shunt Capacitance 7 pF Maximum Motional Capacitance 30 fF Crystal Load Capacitance 18 pF Free Air Operating Temperature Range 0 to 70 º C Drive Level 1 mW max Ageing 5 ppm max ...

Страница 13: ...CL Clock Wýre I2 C Bus 8 FTUN1 Fýlter Tunýng 9 FTUN2 Cloche Fýlter Tunýng 10 VOL Volume and Mute Control Voltage 11 SWI If Standart and swýtch selectýon 12 BOS D Os d Blue Input 13 GOS D Os d Green Input 14 ROS D Os d Red Input 15 FBOS D Os d RGB Insertýon 16 BEXT External Blue Input 17 GEXT External Green Input 18 REXT External Red Input 19 FBEXT Extrenal RGB Insertýon 20 Y CVBS CVBS or Lumýnance...

Страница 14: ...t VDD 6V IOH 80 mA n Low Number Additional Components n Key Release Detection by toggle bits n Very Low Stand by Current 2µA n Operational Current 1mA at 6V Supply n Supply Voltage Range 2 to 6 5V n Ceramic Resanator Controlled Frequency typ 450kHz PINNING 1 Remo 11 VDD 2 SEN 6N 12 DRV 6N 3 SEN 5N 13 DRV 6N 4 SEN 4N 14 DRV 6N 5 SEN 3N 15 DRV 6N 6 SEN 2N 16 DRV 6N 7 SEN 1N 17 DRV 6N 8 SEN 0N 18 DRV...

Страница 15: ...148 D901 3531941480 DIODE 1N4148 D902 3531941480 DIODE 1N4148 D603 3551900330 DIODE BYD33J D605 3551900330 DIODE BYD33J D604 3551901570 DIODE BA157 D806 3551901590 DIODE BA159 D808 3551901590 DIODE BA159 D814 3571905100 DIODE ZENER 5 1V ZPD D810 3571933000 DIODE ZENER 33V UZT 33B C804 3201021156 CAP CER 1NF 1KV M B C805 3201021156 CAP CER 1NF 1KV M B C806 3201021156 CAP CER 1NF 1KV M B C807 320102...

Страница 16: ...90 IC AN7809 IC801 3620246030 IC MC44603 TR802 4042003900 TRF SMPS AK20 90 170 270V R606 3372240237 RES MG 1 2W 220K J D801 3551940070 DIODE 1N4007 D802 3551940070 DIODE 1N4007 D803 3551940070 DIODE 1N4007 D804 3551940070 DIODE 1N4007 L603 4262220027 CHOKE PEAKING COIL 22UH K Q902 3612024820 TR 2SC2482 Q904 3612024820 TR 2SC2482 Q906 3612024820 TR 2SC2482 R925 3361590237 RES FUSE 1 2W 1 5R J 40714...

Страница 17: ... 30000330 CAP CER 4 7NF 50V K B PC 1 000 C01 11 3 30001145 RES MO 1W 33R J PC 1 000 R01 12 3 30001904 JACK HEADPHONE STR VERTICAL PC 1 000 JK01 13 3 30002228 CON ASSY 2 15 R2 6 HP02 PC 1 000 PL01 14 3 30002276 CABLE 2 40 R2 6 WO SOCKET PC 1 000 PL02 15 1 20000591 CRT KIT 14 AK20 WO UL PC 1 000 16 2 30002113 14 DEG COIL EARTH CB PC 1 000 17 2 30007298 CONN ASSY 4 45 R26 HRZ VER IMPROVED PC 1 000 18...

Страница 18: ...3568 SCART COVER WO H I PC 1 000 35 2 60000001 ABS NATURAL KG 0 003 36 1 20003733 BUTTON ASSY 3731 WO TS PC 1 000 37 2 20000920 BUTTON ON OFF 3731 I WO TS PC 1 000 38 3 60000003 ABS BLACK KG 0 002 39 2 20003859 BUTTON FUNCTION 3731 I PC 1 000 40 3 60000003 ABS BLACK KG 0 006 41 2 20004332 LENS PRE AMP 8 24 7MM I PC 1 000 42 3 60000012 ACRYLIC DIACON CLG 356 SEFFAF G 2 550 43 2 20004646 FOOT RUBBER...

Страница 19: ...CB BAV20 1 PC 1 000 62 5 60000047 CCL 1220 1020 1 6 FR2 V0 351 M2 0 009 63 4 30001837 CONN MALE 3P TOP BLUE PC 1 000 PL1004 64 4 30001877 JACK BAV W STOPPER PC 1 000 JK1004 65 4 30002222 CONN ASSY 3 10 SHL D C BLU PC 1 000 PL1004 66 4 35000028 BRACKET BAV 14 PC 1 000 67 4 35000202 SCREW S C ZN YHDB 2 9 9 5 PC 1 000 68 3 20006187 M ASSY 20M OTO 23382321XX1 PC 1 000 69 4 20001125 MB SMD 20 COMMON PC...

Страница 20: ... S603 75 8 30000459 RES CF 1 4W 100R J PC 7 000 R113 R417 R418 R540 R541 R616 R823 76 8 30000466 RES CF 1 4W 1K J PC 1 000 R615 77 8 30000471 RES CF 1 4W 10K J PC 5 000 R504 R537 R549 R831 R832 78 8 30000572 RES CF 1 4W 2K J PC 1 000 R602 79 8 30000590 RES CF 1 4W 2 2K J PC 3 000 R534 R535 R536 80 8 30000594 RES CF 1 4W 22K J PC 2 000 R531 R614 81 8 30000607 RES CF 1 4W 2 2R J PC 1 000 R708 82 8 3...

Страница 21: ... DIODE BA157 PC 1 000 D604 105 8 30001318 DIODE BA159 PC 1 000 D806 106 8 30001329 DIODE 1N4007 PC 5 000 D702 D801 D802 D803 D804 107 8 30001339 DIODE ZENER 3 9V PC 1 000 D512 108 8 30001371 DIODE ZENER 5 1V ZPD PC 1 000 D814 109 8 30001377 DIODE ZENER 33V UZT 33B PC 1 000 D810 110 8 30001979 FIXED COIL 1UH Q45 M A PC 1 000 L101 111 8 30001986 FIXED COIL 3 3UH Q65 K PC 1 000 L102 112 8 30001987 FI...

Страница 22: ...F 50V M PC 2 000 C108 C439 135 6 30000371 CAP EL 22UF 50V M PC 2 000 C504 C602 136 6 30000384 CAP EL 2 2UF 50V M PC 4 000 C309 C408 C502 C701 137 6 30000394 CAP EL 3 3UF 160V M PC 1 000 C605 138 6 30000400 CAP EL 47UF 50V M PC 3 000 C107 C111 C416 139 6 30000407 CAP EL 470UF 16V M PC 1 000 C305 140 6 30000413 CAP EL 4 7UF 50V M PC 2 000 C611 C710 141 6 30000433 CAP CER 1NF 1KV M B PC 4 000 C804 C8...

Страница 23: ...0 R706 R707 160 5 30000567 RES SMD 1 10W 18K J 0805 PC 1 000 R414 161 5 30000588 RES SMD 1 10W 220R J 0805 PC 1 000 R514 162 5 30000597 RES SMD 1 10W 22K J PC 2 000 R433 R703 163 5 30000602 RES SMD 1 10W 220K J 0805 PC 1 000 R117 164 5 30000631 RES SMD 1 10W 2 7K J 0805 PC 1 000 R704 165 5 30000636 RES SMD 1 10W 27K J 0805 PC 3 000 R111 R609 R611 166 5 30000659 RES SMD 1 10W 330R J 0805 PC 2 000 R...

Страница 24: ...186 6 20001139 MB AXI 20 BG IHRAC PC 1 000 187 7 20001140 MB SEQ 20 BG IHRAC PC 1 000 188 8 20005429 MB JUM 20 BG IHRAC PC 1 000 189 9 30002583 JUMPER WIRE 0 6MM G 0 125 D109 190 8 30000459 RES CF 1 4W 100R J PC 1 000 D106 191 8 30000590 RES CF 1 4W 2 2K J PC 1 000 R138 192 8 30000706 RES CF 1 4W 47R J PC 1 000 R140 193 8 30000748 RES CF 1 4W 5 6K J PC 1 000 R201 194 8 30001284 DIODE 1N4148 PC 5 0...

Страница 25: ...1 10W 470R J 0805 PC 1 000 R139 217 5 30000721 RES SMD 1 10W 4 7K J PC 2 000 R207 R522 218 5 30000751 RES SMD 1 10W 5 6K J 0805 PC 3 000 R202 R203 R525 219 5 30000774 RES SMD 1 10W 680R J 0805 PC 1 000 R126 220 5 30001734 JUMPER SMD 0805 PC 2 000 S101 S102 221 4 20001165 MB SMD 20 EUROTEXT PC 1 000 222 5 20001166 MB RAD 20 EUROTEXT PC 1 000 223 6 20001167 MB AXI 20 EUROTEXT PC 1 000 224 7 20001168...

Страница 26: ...004 S007 S008 S009 S010 244 4 20001193 MB AXI 20 11AK20M PCB GRUBU PC 1 000 245 5 20024203 MB SEQ 20 11AK20M PCB GRUBU PC 1 000 246 6 20024204 MB JUM 20 11AK20M PCB GRUBU PC 1 000 247 7 30002583 JUMPER WIRE 0 6MM G 0 625 J608 J706 J809 J811 J810 248 6 30000519 RES CF 1 4W 150R J PC 1 000 R714 249 5 30002408 PCB AK20M 6 PC 1 000 250 4 20001198 MB SMD 20 BAV PC 1 000 251 5 20001199 MB RAD 20 BAV PC ...

Страница 27: ...1 4W 390R J PC 1 000 R827 273 8 30000706 RES CF 1 4W 47R J PC 1 000 R816 274 8 30000779 RES CF 1 4W 68K J PC 1 000 R809 275 8 30001004 RES MF 1 2W 0 56R J PC 2 000 R819 R849 276 8 30001284 DIODE 1N4148 PC 1 000 D805 277 8 30001318 DIODE BA159 PC 1 000 D808 278 6 30000283 CAP CER 1NF 50V K B PC 1 000 C823 279 6 30000295 CAP CER 100NF 50V Z F PC 1 000 C825 280 6 30000318 CAP CER 270PF 500V K B PC 1 ...

Страница 28: ...01240 MB AXI 20 PS W NTSC 3 58 4 43 PC 1 000 302 7 20001241 MB SEQ 20 PS W NTSC 3 58 4 43 PC 1 000 303 8 30000743 RES CF 1 2W 560R J PC 1 000 R715 304 8 30000748 RES CF 1 4W 5 6K J PC 1 000 R448 305 6 30001454 TR BC548B PC 1 000 Q403 306 5 30000209 CAP SMD 18PF 50V J 0805 PC 1 000 C440 307 5 30000259 CAP SMD 4 7PF 50V C CH PC 1 000 C441 308 5 30000721 RES SMD 1 10W 4 7K J PC 1 000 R505 309 5 30000...

Страница 29: ...2 Q904 Q906 333 5 30000249 CAP SMD 390PF 50V J 0805 PC 2 000 C907 C911 334 5 30000256 CAP SMD 470PF 50V J 0805 PC 4 000 C902 C903 C906 C910 335 5 30000265 CAP SMD 560PF 50V J 0805 PC 3 000 C904 C908 C912 336 5 30000284 CAP SMD 1NF 50V K R 0805 PC 3 000 C901 C905 C909 337 5 30000475 RES SMD 1 10W 10K J 0805 PC 2 000 R907 R921 338 5 30000499 RES SMD 1 10W 1 2K J 0805 PC 3 000 R922 R908 R915 339 5 30...

Страница 30: ... CAP EL 470UF 25V M PC 1 000 C833 363 5 30000410 CAP EL 470UF 50V M PC 2 000 C613 C707 364 5 30001081 RES MO 100R 3W J PC 1 000 R604 365 5 30001105 RES MO 1W 15K J PC 1 000 R822 366 5 30001125 RES MO 2W 2 2K J PC 1 000 R607 367 5 30001146 RES MO 2W 33R J PC 1 000 R716 368 5 30001172 RES MO 2W 47K J PC 1 000 R802 369 5 30001270 PTC 9 OHM PC 1 000 TH801 370 5 30001447 TR BD679A PC 1 000 Q601 371 5 3...

Страница 31: ...101 393 5 30009834 CABLE 0 6MM BLUE 6CM PC 2 000 A A G G 394 5 30009846 CABLE 0 6MM BLUE 4CM PC 1 000 X X 395 5 30009850 CABLE 1P R2 6 6CM PC 1 000 XXX 396 5 30009851 CABLE 1P R2 6 35CM PC 1 000 EMC 397 4 20003279 MB MAN 20 EUROTEXT PC 1 000 398 5 30001489 IC CF70204 PC 1 000 IC002 399 5 30001666 IC CF72416 PC 1 000 IC001 400 5 30001738 XTAL 13 875 PC 1 000 X001 401 4 20003294 MB MAN 20 3710 30 31...

Страница 32: ...D501 421 4 20015608 MB MAN 20 90 270V WIDE WO LOW POWER TEAC PC 1 000 422 5 20000848 FUSE ASSY TK79 A 2 5A PC 1 000 T801 423 6 30001731 FUSE 2 5A 250V 5 20MM PC 1 000 424 6 35000136 FUSE HOLDER TK79 A GRAY PC 1 000 F801 425 5 20000979 HE ASY 20 SMPS WIDE PLASTIK PC 1 000 426 6 30001386 TR MTP6N60E PLASTIC PC 1 000 Q801 427 6 35000158 NUT C ZN BOTTOM M3 PC 1 000 428 6 35000165 KNURL WASHER C ZNSY 3...

Страница 33: ...01 DIODE BYM26D PC 1 000 D809 449 5 30001321 DIODE BY298 AK06 PC 1 000 D813 450 5 30001478 IC MC44603 PC 1 000 IC801 451 5 30002086 TRF SMPS AK20 90 90 270 PC 1 000 TR802 452 5 30007308 CAP CER 220PF 1KV K PULSE PC 1 000 CX020 453 4 20024214 MB MAN 20 AK20M ve AK20D PCB GRUBU PC 1 000 454 5 20000977 HE ASY 20 VERTICAL AK20M AK20S PC 1 000 455 6 30001600 IC TDA1771 PC 1 000 IC701 456 6 35000111 HEA...

Страница 34: ... YFMB 2 9 6 5 PC 2 000 474 2 35001777 SCREWSCZNORYAKB 5x30 WITH RUBBER WASHER PC 4 000 475 2 40000173 ISOLATION COTTON 71 78 0 5 PC 1 000 476 1 20015835 F CARTON BOX TEAC EU 34T PC 1 000 477 2 50005982 CARTON BOX TEAC EU 34T PC 1 000 478 2 50006050 CARTON BOX 3745 55 43 10 11 CRF TV EMPTY PC 1 000 479 1 20016399 LENS 3731 W AV V P TEAC TXT PN429C S PC 1 000 480 2 20000891 LENS 3731 W AV I PC 1 000...

Страница 35: ... PC 1 000 493 2 30000001 ANTENNA ROD W ADAPTOR PC 1 000 494 2 30002391 BATTERY AAA UM4 1 5V GREEN PC 2 000 495 2 30007399 R C 930 TEAC ÖZEL S AKAI P RC 734 PC 1 000 496 2 50005981 I B TEAC EU 34T 930 ENG 3731 PC 1 000 497 2 50016146 WARRANTY CARD TEAC ENG 2 PC 1 000 498 1 30007058 14 CPT TUBE AUSTRALIA PC 1 000 499 1 40000113 PLASTIZOTE BAG 14 PC 1 000 500 1 40001938 LOGO TEAC SMALL GRAY W P PC 1 ...

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