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Cameron KS21TK305A, Руководство по обслуживанию

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SERVICE MANUAL 

 

27

 

 

1.8 Functional Description Video Processor 

 

1.8.1 Vision IF amplifier 

 

The vision IF amplifier can demodulate signals with positive and negative modulation. The 

PLL demodulator is completely alignment-free. 

The VCO of the PLL circuit is internal and the frequency is fixed to the required value by using 

the clock frequency of the TCG m-Controller as a reference. The setting of the various frequencies 

(e.g. 38, 38.9, 45.75 and 58.75 MHz) can be made via the control bits IFA-IFC in subaddress 2FH. 

Because of the internal VCO the IF circuit has a high immunity to EMC interferences. 

The output of the AFC detector can be read from output byte 04H and has a resolution of 7 bits 

(25 kHz per step). By means of this information a fast tuning algorithm can be designed. 

The IC contains a group delay correction circuit which can be switched between the BG and a 

uncompensated group delay response characteristic. This has the advantage that in multi-standard 

receivers no compromise has to be made for the choice of the SAWfilter. This group delay 

correction is realised for the demodulated CVBS output signal. The IC contains in addition a sound 

trap circuit with a switchable centre frequency. 

 

1.8.2 Digital Broadcast reception 

 

Apart from processing analogue TV signals, the IF circuit can also preprocess digital TV 

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Содержание KS21TK305A

Страница 1: ...SERVICE MANUAL Color Television Receiver Model KS21TK305A PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 2: ...V ADJUSTMENT 7 V IC INFORMATION 12 1 PHILIPS UOCIII CHIP N603 12 2 SWITCH POWER IC N901 41 3 VERTICAL DEFLECTION BOOSTER N401 45 4 AUDIO POWER AMPLIFIER N202 49 5 EEPROM 24C16 N602 52 VI TV BLOCK DIAGRAM 57 Appendix 1 Schematic Circuit Diagram 58 Appendix 2 PCB Layout Diagram 59 Appendix 3 Exploded Views 63 PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 3: ...necessary when working on these types of equipment When it is necessary to make measurements or tests with AC power applied to the receiver chassis an Isolation Transformer must be used as a safety precaution and to prevent possible damage to transistors The Isolation Transformer should be connected between the TV line cord plug and the AC power outlet Certain High voltage HV maybe cause X ray rad...

Страница 4: ...should be made at each exposed metal part having a return path to the chassis antenna cabinet metal screw heads knobs and or shafts escutcheon etc in the following manner Plug the AC line cord directly into a 110V 240V or 180V 240V AC receptacle Do not use an Isolation Transformer during these checks All checks must be repeated with the AC line cord plug connection reversed If necessary a non pola...

Страница 5: ...sing coil 7 When removing a PCB or related component after unfastening or changing a wire be sure to put the wire back in its original position 8 Inferior silicon grease can damage IC s and transistors When replacing IC s and transistors use only specified silicon grease Remove all old silicon when applying new silicon 9 Before removing the anode cap discharge drastically because it contains high ...

Страница 6: ...Tuning for VHF and UHF Bands Auto Tuning Manual Tuning 3 4 Picture and Sound Adjustment Bright Contrast Color Sharpness Control and Color Temperature Adjustment TINT Control NTSC only Volume Control More controls can do in TV Model 21SL39 and 29F08 3 5 OSD General Features Volume Brightness Contrast Color Program Band Auto Search Manual Tune Muting AV TV Child Lock and Sleep Timer AV Stereo Russia...

Страница 7: ...rd Colour Temperature 9300K X 0 284 Y 0 299 TV ADJUSTMENT Test Equipment 1 Oscilloscope 2 Multifunction meter Internal resistance DC 20kΩ V AC 5kΩ V 3 High voltmeter 35kV 4 Standard Signal Generator 5 Degaussing coil Factory menu Some adjustments must be performed in the Factory menu You can enter the Factory menu in the following way 1 Press the MENU button on the remote control then press the Q ...

Страница 8: ...quipment High voltmeter 1 Make sure AC power supply and B are within pointed range before calibrating high voltage 2 Connect high voltmeter to anode G4 of CRT 3 Turn on the TV set the BRIGHTNESS and CONTRAST to the minimum zero beam current swap to AV mode No any signal applied 4 High voltage please see the related model BOM 5 Filament voltage measured by virtual value meter please see the related...

Страница 9: ...into factory menu to call up FAC2 VERT SLOPE 50 60 XX Adjust it so that horizontal midline of the pattern superpose with the black edge of the pattern VERT SHIFT 50 60 XX Adjust it so that the pattern midline superposes over CRT geometric center VERT AMPLE 50 60 XX Adjust it so that the picture vertical reproduction display ratio is more than 92 S CORR 50 60 XX Adjust it so that upper pane and bot...

Страница 10: ... straight line Receive cross hatch signal Bow correction PARALLEL 50 60 XX Adjust it so that left and right line are straight lines Pincushion correction White balance adjustment PAL or SECAM signal 1 Enter into menu firstly and set COLOR mode to normal 9300K 2 Enter into AV mode and receive left black right white signal which with color sync signal 3 Plug XS805 adjust it automatically with white ...

Страница 11: ...YVolume2 44 44 44 44 Main YVolume3 58 58 58 58 Main XVolume1 22 22 22 22 Factory adjustment5 Main XVolume2 44 44 44 44 Max Brightness 47 47 47 47 Max Contrast 63 63 63 63 Factory adjustment6 Max Colour 47 47 47 47 RGB 10 10 10 10 Factory adjustment7 CL 4 2 4 8 RGB IN 0 0 0 0 DVD1 IN 0 0 1 1 AV2 IN 0 0 1 1 AV3 IN 1 1 1 1 AV1S IN 0 0 1 1 Factory adjustment9 CBVS OUT 1 1 1 1 IF 3 3 3 3 TUNER 0 0 0 0 ...

Страница 12: ...nt14 PWR ONKEY 1 1 1 1 IC INFORMATION 1 PHILIPS UOCIII CHIP N603 In this section mainly describe two ICs TDA12060 and TDA12062 the TDA12060 is a AV Stereo without audio DSP chip but the TDA12062 is a AV Stereo with audio DSP chip 1 1 General description The UOCIII series combines the functions of a Video Signal Processor VSP together with a FLASH embedded TEXT Control Graphics Controller TCG Contr...

Страница 13: ...th 10 page text memory The ICs are mounted in a QFP 128 package and can be used in economy television receivers with 90 and 110 picture tubes The package is according to the ROHS legislation which also means that the package is lead free The ICs have supply voltages of 5V 3 3V Also an 1 8V supply is needed but this can be simply derived by adding an emitter follower at a reference voltage from the...

Страница 14: ...us forced mode possibilities Internal base band delay line Indication of the Signal to Noise ratio of the incoming CVBS signal Linear RGB YPBPR input with fast insertion YUV interface When this feature is not required some pins can be used as additional RGB YPBPR input It is also possible to use these pins for additional CVBS or Y C input CVBS YX and CX Tint control for external RGB YPBPR signals ...

Страница 15: ...n external bandpass filter is inserted The vision IF and mono intercarrier sound circuit can be used for the demodulation of FM radio signals With an external FM tuner also signals with an IF frequency of 10 7 MHz can be demodulated Switch to select between 2nd SIF from QSS demodulation or external FM SSIF 1 2 3 Audio Interfaces and switching Audio switch circuit with 4 stereo inputs a stereo outp...

Страница 16: ...of both Double Size Double Width Double Height characters Scrolling of display region Variable flash rate controlled by software Soft colours using CLUT with 4096 colour palette Globally selectable scan lines per row 9 10 13 16 and character matrix 12x9 12x13 12x16 16x18 VxH Fringing Shadow selectable from N S E W direction Fringe colour selectable Contrast reduction of defined area Cursor Special...

Страница 17: ...SERVICE MANUAL 17 Curtaining effect via software 1 3 Quick reference data PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 18: ...SERVICE MANUAL 18 PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 19: ...SERVICE MANUAL 19 1 4 Block diagram Note TDA12062block diagram 1 5 Pinning information PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 20: ...SERVICE MANUAL 20 Note TDA12062 s pinning PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 21: ...SERVICE MANUAL 21 PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 22: ...SERVICE MANUAL 22 PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 23: ...s required Furthermore two additional user reset possibilities are offered a hardware reset via pin P_TMSEL a software reset via pin P_TMSEL The pin P_TMSEL is in two different ways for test mode and FLASH ISP programming control and as a global reset pin to the TCG Controller The reset capability is an active high reset incorporating an internal pull down Thus it can be left unconnected in the ap...

Страница 24: ...unters WatchDog Timer UART SAD and PWMs To enter Stand by mode the STANDBY bit in the ROMBANK register must be set The status of all SFRs internal RAM contents are maintained as are the device output pin values but the contents of Display memory are lost Since the output values on RGB and VDS are maintained the display output must be disabled before entering this mode This mode should be used in c...

Страница 25: ...mpare circuit When TCG Controller is configured in this mode detection of an analogue threshold at the input to the SAD may be used to trigger wake up of the device i e TV Front Panel Key press As above the interrupt is serviced and following the instruction RETI the next instruction to be executed will be the one following the instruction that put the device into Idle The third method of terminat...

Страница 26: ... is with a Power On reset Reset defines all SFRs and Display memory but maintains all other RAM values Code execution commences with the Program Counter set to 0000 1 6 2 4 General recommendations In power saving application modes where all three external interrupts are required the Idle mode must be used The difference between the Power Down mode and the Idle mode in terms of power is quite small...

Страница 27: ...ferences The output of the AFC detector can be read from output byte 04H and has a resolution of 7 bits 25 kHz per step By means of this information a fast tuning algorithm can be designed The IC contains a group delay correction circuit which can be switched between the BG and a uncompensated group delay response characteristic This has the advantage that in multi standard receivers no compromise...

Страница 28: ... with an external circuit 1 8 3 QSS Sound circuit The sound IF amplifier is similar to the vision IF amplifier and has an external AGC decoupling capacitor The single reference QSS mixer is realised by a multiplier In this multiplier the SIF signal is converted to the intercarrier frequency by mixing it with the regenerated picture carrier from the VCO The mixer output signal is supplied to the ou...

Страница 29: ...ng sound frequency This can be realized by means of a software loop which switches the demodulator to the various frequencies and then select the frequency on which a lock condition has been found The amplitude deemphasis output signal changed with 6 dB by means of the AGN bit In this way output signal differences between the 4 5 MHz standard frequency deviation 25 kHz and the other standards freq...

Страница 30: ...e YC bit The CVBS selector has one independently switchable output The switch configuration is given in Figure 72 The choice of the various modes can be made via the INA IND bits in subaddress 38H The function of the IFVO SVO CVBS6 pin is determined by the SVO1 SVO0 bits When used as output a selection can be made between the IF video output signal or the selected CVBS signal monitor out This pin ...

Страница 31: ...YPBPR inputs but from the YOUT pin For this reason the YOUT pin must be capacitively coupled to the YSYNC pin The delay between the various inputs and the YOUT signal can have rather large differences e g comb filter active or not By choosing the YOUT signal as input signal for the sync separator these delays have no effect on the picture position Only for RGB signals without sync on green the inp...

Страница 32: ...is obtained when the VDXEN bit is 0 Due to the input signal selector configuration it is possible that the internal CVBS signal is available on one of the other CVBS inputs In this condition the connections between the vision IF amplifier and the synchronisation circuit can be switched on and off by means of the VDX bit The VDXEN bit must be set to 1 for this mode The vertical synchronisation is r...

Страница 33: ...e output is high ohmic during the vertical retrace 1 ms so that the vertical guard pulse can be detected Single ended output switch Input port The functionality of this pin is controlled by the VGM1 0 and LED bits When the East West geometry function is not required e g for 90 picture tubes the EW output pin can be used for the connection of the AVL capacitor This function is chosen by means of th...

Страница 34: ...centre frequency via the PF1 PF0 bits in subaddress 19H Ratio of positive and negative peaks via the RPO1 RPO0 bits in subaddress 47H The peaks in the direction white are the positive peaks Ratio of pre and aftershoots via the RPA1 RPA0 bits in subaddress 47H Video dependent coring in the peaking circuit The coring can be activated only in the low light parts of the screen This effectively reduces...

Страница 35: ...ff in the right half of the picture or vice versa It is possible to add a signal blanking in the middle of the screen The features that are switched on and off are peaking scan velocity modulation black stretch gamma control DC transfer ratio blue stretch dynamic skin tone control tint on U V and soft clipping 1 8 10 Colour decoder The ICs decode PAL NTSC and SECAM signals The PAL NTSC decoder doe...

Страница 36: ...vailability of the subcarrier signal is controlled by the CMB2 CMB0 bits 1 8 11 RGB output circuit In the RGB control circuit the signal is controlled on contrast brightness and saturation The IC has a YUV interface so that additional picture improvement ICs can be applied To compensate signal delays in the external YUV path the clamp pulse in the control circuit can be shifted by means of the CLD...

Страница 37: ...ain registers of the 3 channels can be stored during switch off and can be loaded again during switch on so that the drive conditions are maintained When required the operation of the CCC system can be changed into a one point black current system The switching between the 2 possibilities is realised by means of the EGL bit EGL 0 in subaddress 42H When used as one point control loop the system wil...

Страница 38: ...n a few steps During switch off of the TV receiver a fixed beam current is generated by the black current control circuit This current ensures that the picture tube capacitance is discharged During the switch off period the vertical deflection can be placed in an overscan position so that the discharge is not visible on the screen A wide blanking pulse can be activated in the RGB outputs by means ...

Страница 39: ...and decoder DEMDEC is based on the following new features Easy demodulator setup for all implemented standards with Demodulator and Decoder Easy Programming DDEP for a pre selected standard or combined with Auto Standard Detection ASD for automatic detection of a transmitted standard Automatic decoder configuration and signal routing depending on the selected or detected standard FM overmodulation...

Страница 40: ...SERVICE MANUAL 40 2 3 Functions of each terminal PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 41: ...SERVICE MANUAL 41 2 4 Example Application Circuit 2 5 Pin Configuration PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 42: ...SERVICE MANUAL 42 2 6 Electrical characteristics in MOSFET PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 43: ...n The STV9325 is a vertical deflection booster designed for TV and monitor applications This device supplied with up to 35 V provides up to 2 5 App output current to drive the vertical deflection yoke The internal flyback generator delivers flyback voltages up to 75 V In double supply applications a stand by state will be reached by stopping the supply alone 3 1 3 Pin Configuration PDF 文件使用 pdfFac...

Страница 44: ...SERVICE MANUAL 44 3 1 4 Internal Block Diagram PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 45: ...SERVICE MANUAL 45 3 1 5 Absolute Maximum Ratings PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 46: ...SERVICE MANUAL 46 3 1 6 Electrical Characteristics PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 47: ...s On the other hand 2 supply sources VS and VEE are required A Stand by state will be reached by switching OFF the positive supply alone In this state where both inputs are the same voltage as pin 2 ro higher the output will sink negligible current from the deviation coil PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 48: ...ANUAL 48 3 1 7 1 Centering 3 1 7 2 Peak Current 3 1 7 3 Ripple Rejection When both ramp signal and bias are provided by the same driver IC you can gain natural PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 49: ...ed to the booster reference point which is the ground side of R1 4 AUDIO POWER AMPLIFIER N202 4 1 TDA2615 used in TV Model 1402 2108 21F08 21SL39 TDA2615 is a 2 X 6 W hi fi audio power amplifier 4 1 1 Features Requires very few external components No switch on switch off clicks Input mute during switch on and switch off Low offset voltage between output and ground Excellent gain balance of both am...

Страница 50: ... in a 9 lead plastic single in line SIL9MPF medium power package It has been especially designed for mains fed applications such as stereo radio and stereo TV 4 1 3 Quick Reference Data 4 1 4 Block Diagram PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 51: ... 6 V while the amplifier still retains its DC operating adjustment The circuit features suppression of unwanted signals at the inputs during switch on and switch off The mute circuit can also be activated via pin 2 When a current of 300 A is present at pin 2 the circuit is in the mute condition The device is provided with two thermal protection circuits One circuit measures the average temperature...

Страница 52: ...C16 N602 5 1 Features Write Protect Pin for Hardware Data Protection Utilizes Different Array Protection Compared to the AT24C16A Low voltage and Standard voltage Operation 2 7 VCC 2 7V to 5 5V PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 53: ...ption The AT24C16A provides 16384 bits of serial electrically erasable and programmable read only memory EEPROM organized as 2048 words of 8 bits each In the AT24C16A the 16K is internally organized with 128 pages of 16 bytes each Random word addressing requires an 11 bit data word address The device is optimized for use in many industrial and commercial applications where low power and low voltag...

Страница 54: ...Block Diagram 5 5 Pin Description SERIAL CLOCK SCL The SCL input is used to positive edge clock data into each EEPROM device and negative edge clock data out of each device PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 55: ...ations when connected to ground GND When the Write Protect pin is connected to VCC the write protection feature is enabled and operates as shown in the following table 5 6 Device Operation Clock and Data Transitions The SDA pin is normally pulled high with an external device Data on the SDA pin may change only during SCL low time periods Data changes during SCL high periods will indicate a start o...

Страница 56: ...A features a low power standby mode which is enabled a upon power up and b after the receipt of the STOP bit and the completion of any internal operations Memory Reset After an interruption in protocol power loss or system reset any 2 wire part can be reset by following these steps a Clock up to 9 cycles b look for SDA high in each cycle while SCL is high and then c create a start condition as SDA...

Страница 57: ... TDA2615 CRT BOARD POWER IC STR6753 Speaker Vertical circuit STV9325A IF AV1 SVHS input R G B B 21V 12V 12V 8V 5V 5V 9V B 12V 12V 24C16 21V RF I C SAW FILT ER CR T 220 AV2 YCbCr input AV output I C Horizontal circuit PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 58: ...SERVICE MANUAL 58 Appendix 1 Schematic Circuit Diagram 1 Main Board 35009395 2 CRT Board 35008607 PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 59: ...SERVICE MANUAL 59 Appendix 2 PCB Layout Diagram 1 Main Board 35009395 PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 60: ...SERVICE MANUAL 60 2 CRT Board 35008607 PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 61: ...SERVICE MANUAL 61 PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 62: ...SERVICE MANUAL 62 Appendix 3 Exploded Views PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Страница 63: ...SERVICE MANUAL 63 PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

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Страница 66: ...KS21TK305A ASSEMBLY 36033108 36031315 36031314 36033109 ...

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