Service Manual - Cenatel

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High-l evel command language FLOF ( Fastext), and TOP support 10 pages memory on chip (10kB) 4-1-5- Display OSD Features 3kB OSD RAM on chip WST level 1.5 compliant WST level 2 parallel attributes 32 for eground/background colours programmable colour look-up table 1024 mask programmable characters 17 national languages (Latin, Cyrillic and Greek caracter sets) Character matrix 10x10 4-color mode for user font 4-1-6- Audio Features Three mono inputs Two mono outputs Programmable channel select Volume control for one mono channel 4-1-7- General Features Submicron CMOS technology L ow-power standby mode Single 20.25 MHz crystal 64-pin PSDIP package 4-1-8- Data Capture The Video Front End section takes in the analogue Composite Video and Blanking Signal (CVBS), and from this extracts the required data, which is then decoded and stored in memory. The extraction of the data is performed in the digital domain. The first stage is to select and convert the analogue CVBS signal into a digital form. This is done using 8 bit ADC sampling at 20.25 Mhz. The digital data services transmitted in the VBI are selected and acquired separately form the video part. This is done by the use of an adaptive data slicer. The following data types can be extracted : 625 line World System Teletext (WST), VPS, WSS. The data is acquired and decoded by the teletext decoder (TPU), then stored in an SRAM lnterface. 4-1-9- Data Capture Features Video Signal Quality detector Data Capture for 625 lin e WST Data Capture fo r VPS data (PDC system A) Data C apture for Wide Screen Signalling (WSS) bit decoding Real-time capture and decoding fo r WST Teletext in Hardware, to enable optimised microprocessor throughput 10 page memory stored On-Chip - 18 -
• Inventory of transmitted Teletext pages stored in the Page Table Signal quality detector fo r WST data Comprehens ive Teletext language coverage Full Field Vertical Blanking Interval (VBI) data capture of WST data 4-1-10- TV processor version and -Controller capacity IC version VCT 3832A VCT 3834A 8 bit -controller ROM size 96k 96k RAM size PAL decoder SECAM decoder NTSC decoder Picture improvement 1k 1k Teletext page memory 10 pages 10 pages Adaptive Comb filter Panorama Scaler X 4-1-11- IC marking and version Chassis IC marking OSD languages ATSS countries Text CP885 VCT3832A CP885F VCT3834A WP895F VCT3834A WP895 VCT3834A 4-1-12- Pinning English, French, German, Italian, Spanish, Dutch, Danish, Finnish, Norwegian, Swedish, Greek, Polish, Hungarian, Czech, Slovakian, Romanian, Russian. - 19 - GB, France, Germany, Italy, Belgium, Spain, Austria, Poland, Switzerland, Denmark, Finland, Netherlands, Norway, Sweden, Ireland, Hungary, Czech Republic, Others PSDIP 64-pin Pin Name Type Short Description 1 Power OUT High = SMPS ON, Low = SMPS in stand by mode. 2 AGC IN For service only, tuner AGC, TOP alignment. 3 VSUPP1 SUPPLY Supply Voltage, Port ( pin 1, 2, 5, 6, 7, 8, 9, 10, 61, 62, 63, 64). 4 GNDP1 SUPPLY Ground, Port. 5 MOD_SW OUT High = Negative modulation, Low = Positive modulation (L/L’). 6 SECAM L/L’ OUT High = L’, Low = L. 7 AFC IN 8 IR IN 9 SC1.SW IN 10 SC2.SW IN 11 VOUT OUT Analog Video Output 12 VRT IN Reference Voltage Top, Video ADC 13 SGND IN Signal Ground for Analog Input Pan-European Latin. Cyrillic, Greek.
Page 1 and 2: S/M No. : TWP895BEF0 Service Manual
Page 3 and 4: Specification matrix CHASSIS NAME W
Page 5 and 6: 19 Video Output 1 Vpp 3dB, Impedanc
Page 7 and 8: CH EUROPE CCIR FRANCE GB(IRELAND) E
Page 9 and 10: 1-3 ATSS sorting method The TV set
Page 11 and 12: 2 - Safety instruction WARNING: Onl
Page 13 and 14: 3-3 Microcontroller configuration :
Page 15 and 16: CORNER EW TRAPEZ 3-4-8- AGC - Adjus
Page 17: Horizontal scaling ( 0.25 to 4 ) Pa
Page 21 and 22: 1 Power 2 AGC 3 S/B 5V 4 Gnd 5 MOD
Page 23 and 24: - high deviation FM-mono mode (max.
Page 25 and 26: Pin No. Pin Name Type Short descrip
Page 27 and 28: 4-3-4 Block diagram Pin Symbol Func
Page 29 and 30: Block diagram TDA8944J - 29 -
Page 31 and 32: 4-5-2 TDA8358J An East-West output
Page 33 and 34: 4-6 TDA6107Q The TDA6107Q includes
Page 35 and 36: 4-6 24C16 - 16 Kb EEPROM features :
Page 37 and 38: 4-8-4 Pins description pin name sym
Page 39 and 40: 5 - Circuit description 5-1 Block d
Page 41 and 42: SAW filters Ref. Standard Features
Page 43 and 44: 5-3 Video - VCT description 5-3-1 I
Page 45 and 46: 5-3-11 Video Sync Processing To ext
Page 47 and 48: 5-3-20 EHT Compensation The vertica
Page 49 and 50: 23, in each frame. This is bi-phase
Page 51 and 52: can always be overridden by the use
Page 53 and 54: 5-6-4 NICAM decoder In case of NICA
Page 55 and 56: 5-9 Power supply (STR F6654) 5-9-1
Page 57 and 58: 5-9-2-2 STR-F6654 oscillating opera
Page 59 and 60: 5-10 TV start-up, TV normal run and
Page 61 and 62: On normal run mode, I501 microcontr
Page 63 and 64: - 65 - D801...D804 GRAETZ BRIDGE SW
Page 65 and 66: 6. Service Parts List CAUTION “
Page 67 and 68: LOC PART CODE PART NAME DESCRIPTION
Page 69 and 70:
LOC PART CODE PART NAME DESCRIPTION
Page 71 and 72:
LOC PART CODE PART NAME DESCRIPTION
Page 73 and 74:
7. Exploded View 7-5 DTP-28B1 - 73
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Service Manual - Cenatel

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