Page 2 - Service manual SC-150; Contents
Service manual SC-150 -1- Contents 1 - Main features ........................................................................................................................................................ 4 1-1 Specifications ............................................................................
Page 4 - Fo; -1 Service part list; -Controller I/O pin configuration and function
Service manual SC-150 -3- Fo 5-4-1 Introduction........................................................................................................................................... 515-4-2 CPU ........................................................................................................
Page 5 - 5 ohm unbalanced
Service manual SC-150 -4- 1- Main Features 1-1 Specifications TV standard PAL - SECAM B/G D/K, PAL I/I, SECAM L/L' Sound system NICAM B/G, I, D/K, L,FM 2Carrier B/G, D/K Power consumption Sound Output Power 7W x2 (at 1KHz, 60% mod, 10% THD) Speake r 10W(Normal) 8 ohm X 2 Teletext system 10 pages mem...
Page 8 - Video Output
Service manual SC-150 -7- 19 Video Output 1 Vpp 3dB, Impedance 75 ( Monitor output ) - Not available for cp885 20 Video Input, Y In. 1 Vpp 3dB, Impedance 75 21 Common Earth
Page 9 - CH
Service manual SC-150 -8- CH EUROPE CCIR FRANCE GB(IRELAND) EAST OIRT C01 46.25 - 47.75 49.75 C02 48.25 55.75 (L’) 53.75 59.25 C03 55.25 60.5 (L’) 61.75 77.25 C04 62.25 63.75 (L’) 175.25 85.25 C05 175.25 176.00 183.25 93.25 C06 182.25 184.00 191.25 175.25 C07 189.25 192.00 199.25 183.25 C08 196.25 2...
Page 13 - ATSS tur n On your satellite r ecei ver and tune “ SKY NEWS ”.; Special case : France
Service manual SC-150 -12- The sor ting order within group II, III, and IV is based on the channel frequency. The Pro g ram with the lo westfrequency is allocated the first rank in its group, and so f o rth until the last program of the group which has thehighest fr equency. If France is selected, t...
Page 14 - - Safety instruction; when working on high voltage equipment.; PRODUCT SAFETY NOTICE
Service manual SC-150 -13- 2 - Safety instruction WARNING: Only competent service personnel may carry out work involving the testing or repair of this equipment. X-RAY RADIATION PRECAUTION 1. Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid such hazards, the highvol...
Page 15 - - Alignment instructions
Service manual SC-150 -14- 3 - Alignment instructions 3-1 Micr ocontroller con figuration : Service modeTo switc h the TV set into service mode please see instruction belo w. 1 - Select pr. number 912 - Adjust sharpness to minim um and exit all menu.3 - Quickly press the key sequence : RED - GREEN -...
Page 16 - OPTION 1; Normal I; OPTION 2
Service manual SC-150 -15- 3-3 Microcontroller con figuration : Option bitsThese option bits are availa ble from Ser vice mode. F irst find the OPTION contr ol, and then use keys 0...7 on theremote ke ypad to control bits 0 to 7 respect ively. The table below shows the options a vailable ; 1 0 B7 B6...
Page 17 - HOR PARAL
Service manual SC-150 -16- HOR PARAL H BOW HOR WIDTH PARAROLA 3-4-6- Horizontal picture centringAdjust HOR CEN(Horizontal center) to have the picture in the center of the screen. 3-4-7- Eau/West comectionAdjust the PARABOLA, HOR WIDTH, CORNER, HOR PARAL, EW TRAPEZ, H BOW, to compensate forgeometrica...
Page 18 - CORNER; AGC” item in service mode.
Service manual SC-150 -17- CORNER EW TRAPEZ 3-4-8- AGC- Adjust the antenna signal level at 70 dB V 2- Tune a colour bar pattern.- Find the “ AGC” item in service mode. - Adjust AGC volume ( RB10 ) to bring the cursor to central position : 32.
Page 22 - RAM size; PSDIP
Service manual SC-150 -21- IC marking English, French,German, Italian,Spanish, Dutch,Danish, Finnish,Norwegian, Swedish,Greek, Polish,Hungarian, Czech,Slovakian, Romanian,Russian,Bulgarian • Inventory of transmitted Teletext pages stored in the Page Table Signal quality detector fo r WST data Compre...
Page 23 - Pin Name
Service manual SC-150 -22- 14 GNDAF SUPPLY Ground, Analog Front-end 15 VSUPAF SUPPLY Supply Voltage, Analog Front-end 16 CBIN IN Analog Component Cb Input 17 CIN1 IN Analog Chroma 1 Input 18 CIN2/CRIN IN Analog Chroma 2 Input / Analog Component Cr Input 19 VIN1 IN Analog Video 1 Input 20 VIN2 IN Ana...
Page 32 - Pin configuration; SHORT CIRCUIT; The TDA8358J are power circuit for use in 90
Service manual SC-150 -31- Block diagram TDA8946J Pin configuration 3 16 Vcc1 Vcc2 IN1- OUT1- OUT1- OUT1+ OUT2- OUT2+ IN1+ IN1- IN2- MODE SVR IN2+ n.c. n.c. n.c. GND GND2 GND1 GND2 Vcc1 Vcc2 OUT1+ OUT2- OUT2+ IN1+ IN2- IN2+ MODE SVR 11 10 STANDBY/MUTE LOGIC 20 Vcc 15 SHORT CIRCUIT AND TEMPERATURE PR...
Page 40 - -Serial control through I; Vcc; C Decoder
Service manual SC-150 -39- 4-9 CXA1315P 4-9-1 General description The CXA1315M/P is developed as a 5-channel 8- bit D/A converter supporting with I 2 C bus. 4-9-2 Features -Serial control through I 2 C bus -5-channel 8-bit D/A converter -Built-in 4general-purpose I/O ports (Digital I/O) -I/O can be ...
Page 44 - - Circuit description
Service manual SC-150 -43- 5 - Circuit description 5-1 Block diagram
Page 45 - generation and the video demodulator.
Service manual SC-150 -44- 5-2 IF section 5-2-1 Block diagram The video IF signal (VIF) is fed through a SAW filter to the differential input (Pin 6-7) of the VIF amplifier. 5-2-2 Vision IF Amplifier This amplifier consists of three AC-coupled amplifier stages. Each differential amplifier is gain co...
Page 46 - Features
Service manual SC-150 -45- SAW filters Ref. Standard Features K3953M B/G - D/K - I - L/L’ - IF filter for video application - TV IF filter with Nyquist slopes at 33.9 MHz and38.9 MHz- Constant group delay K9650M B/G - D/K - I - L/L’ - IF filter for audio application - TV IF audio filter with two cha...
Page 48 - ded in the video decoder.
Service manual SC-150 -47- 5-3 Video - VCT description 5-3-1 Introduction The VCT 38xxA includes complete video, display, and deflection processing.All processing is done digitally, the video front-end and video back-end are interfacing to the analogue world.Most functions can be controlled by softw...
Page 50 - which
Service manual SC-150 -49- 5-3-11 Video Sync Processing To extract the sync information from the video signal, a linear phase low-pass filter eliminates all noise and videocontents above 1 MHz. The sync is separated by a slicer; the sync phase is measured. A variable window can beselected to improve...
Page 53 - configuration
Service manual SC-150 -52- configuration Stand by TV ON 1 Power Push Pull Low Push Pull High Switch OFF / ON SMPS 2 AGC High impedance High impedance Tuner AGC level input –For factory use only 5 Mod SW High impedance Push Pull High = Negativemodulation, Low = Positivemodulation (L/L’). 6 SECAM L’ H...
Page 55 - The terms used in the schematic are described below ; AV KEY; AV
Service manual SC-150 -54- The following schematic, illustrates the logic of control for the two SCART connectors. The terms used in the schematic are described below ; 1. AUTO represents a situation where the television has self-selected its picture source. This could be when theSCART SLOW SWITCHIN...
Page 56 - -5 Teletext Display
Service manual SC-150 -55- can always be overridden by the user after the event.Each line on the diagram, with its associated text, represents the exact conditions under which the change of state willoccur. Sometimes this will be accompanied by another action which will be automatically performed by...
Page 58 - Autodetect” is stored for each programme.
Service manual SC-150 -57- 5-6-4 NICAM decoder In case of NICAM - mode, the phase samples are decoded according the DQPSK - coding scheme. The output of thisblock contains the original NICAM bitstream. 5-6-5 DSP section All audio baseband functions are performed by digital signal processing (DSP). T...
Page 59 - -8 Vertical deflection; . The principle of operation with two supply; The guard signal is not used.
Service manual SC-150 -58- 5-7-2 Mode selection The TDA894xJ has several functional modes, which can be selected by applying the proper DC voltage to pin MODE. Mute : In this mode the amplifier is DC biased but not operational (no audio output). This allows the input couplingcapacitors to be charged...
Page 60 - -9-2 Power supply primary part operations
Service manual SC-150 -59- 5-9 Power supply (STR F6654) 5-9-1 STR-F6654 general description The STR-F6654 is an hybrid IC with a build-in MOSFET and control IC, designed for flyback converter type switchmode power supply applications. 5-9-2 Power supply primary part operations An oscillator generate...
Page 63 - When the pin 1 voltage reaches the threshold voltage V
Service manual SC-150 -62- When the MOSFET is ON, the STR-F6654 internal capacitor C1 is charged at the constant voltage 6.5V.At the same time, the voltage at pin 1 (OCP / FB) increases with the same waveform as the MOSFET drain current. When the pin 1 voltage reaches the threshold voltage V TH1 = 0...
Page 64 - -10 TV start-up, TV normal run and stand by mode operations
Service manual SC-150 -63- 5-10 TV start-up, TV normal run and stand by mode operations 5-10-1 TV start-up operations * Schematic diagram for start-up operations * TV start-up and microcontroller initialisation - When SW801 power switch is pushed, main AC voltage is applied to T801 transformer (afte...
Page 65 - 4 and picture appears on screen.
Service manual SC-150 -64- . If the TV set was on normal run mode before switching off, the microcontroller delivers horizontal drive voltage at pin 24 and picture appears on screen. . If the TV set was on stand-by mode before switching off, the microcontroller switches TV set to stand-by mode, decr...
Page 66 - On normal run mode, I501 microcontroller pin 1 (power) is set to high
Service manual SC-150 -65- On normal run mode, I501 microcontroller pin 1 (power) is set to high So, I810 controlled rectifier is not conducting - Q809 is conducting. So, Q808 is not conducting and Q807 is conducting- So, Q807 collector is connected to the ground and I810 controlled rectifier gate p...
Page 68 - SM
Service manual SC-150 -67- 2 4 3 DRAIN I801 M O F S ET AND CONTROL IC 1 MAIN AC VOLTAGE I804 OPTO COUPLER I823 3.3V REGULATOR I703 IR RECEIVER FRONT MAS K BUTTONS I810 CONTROLLED RECTIFIER S W ITCHING CIRCUIT T 801 SM P S T R A N S I501 MAIN IC OCP FB D801...D804 GRAETZ BRIDGE 16 D821 I810 controlle...
Page 69 - Fig : I810 controlled rectifier switching circuit
Service manual SC-150 -68- I 8 1 0 C O N T R O L L E D R E C T I F I E R R 8 2 0 R 8 3 0 C 8 3 0 R 8 2 9 Q 8 0 8 6 V D C Q 8 0 9 Q 8 0 7 H I G H H I G H H I G H L O W P O W E R L O W Fig : I810 controlled rectifier switching circuit * TV set stand-by mode operations - On stand-by mode, I501 microcon...
