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Hitachi C28W440N, Руководство по обслуживанию

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6

 
 
 

1.  INTRODUCTION  

This is a 

110° chassis capable of driving 28-29”,32”,33” tubes at appropriate currents.

 

The chassis have,

 

Frequency Controlled Tuning (PLL), and control system for multi-standard 
(Pal,Secam,BG,DK,L/L’,I/I’,NTSC,M,N ) TV receivers with on-screen-display (OSD) for all relevant 
control functions. The system is based on the ‘one-chip’ I

2

C bus controlled video processing/deflection 

IC TDA8885 which also controls sound. 
German stereo and Nicam is detected and processed by the MSP 3410 G. Dolby sound is processed by 
MSP 3452 G, virtual dolby by MSP 3411G, BTSC Stereo by MSP 3420G (or MSP 3440G ) IC’s by 
option. All sound processors also control the sound volume, balance, tone and spatial stereo effect. 
The user-interface is menu based control system with cursor keys. Only for some functions the colour 
keys are needed: This means that some of the functions can also be operated from the local keyboard 
(i.e. Vol -, Vol +, P -, P+ and Menu). 
Teletext is done by the microcontroller on-chip teletext module.Fastext/Toptext(8page),One page are 
optional. 

 

2.  SMALL SIGNAL PART WITH TDA8885 

 

The TDA8885 combines all small signal functions required for a colour TV receiver.

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

 

2.1. 

Vision IF amplifier 

The IF-amplifier contains 3 ac-coupled control stages with a total gain control range, which is higher 
then 66 dB. The sensitivity of the circuit is comparable. The video signal is demodulated by means of 
an alignment-free PLL carrier regenerator with an internal VCO. This VCO is calibrated by means of a 
digital control circuit, which uses the clock frequency of the m-Controller/Teletext decoder as a 
reference. The frequency setting for the various standards (33.4, 33.9, 38, 38.9, 45.75 and 58.75 MHz) 
is realised via the I²C-bus. To get a good performance for phase modulated carrier signals the control 
speed of the PLL can be increased by means of the FFI bit. The AFC output is generated by the digital 

Содержание C28W440N

Страница 1: ...ie Sicherheitshinweise und Hinweise zur Produktsicherheit in diesem Wartungshandbuch zu lesen SERVICE MANUAL MANUEL D ENTRETIEN WARTUNGSHANDBUCH Data contained within this Service manual is subject to alteration for improvement Les données fournies dans le présent manuel d entretien peuvent faire l objet de modifications en vue de perfectionner le produit Die in diesem Wartungshandbuch enthaltenen...

Страница 2: ...2 9 COMBFILTER TDA 9181 _______________________________________ 12 10 POWER SUPPLY SMPS _____________________________________ 12 11 POWER FACTOR CORRECTION_______________________________ 12 12 MICROCONTROLLER SDA555X _______________________________ 12 12 1 General Features_________________________________________________12 12 2 External Crystal and Programmable clock speed ______________________12...

Страница 3: ...______________________________25 16 10 1 Description________________________________________________________ 25 16 10 2 Applications _______________________________________________________ 26 16 10 3 General features ___________________________________________________ 26 16 11 ST24C08 _______________________________________________________26 16 11 1 General description ____________________________...

Страница 4: ...atures __________________________________________________________ 34 16 19 TDA9885i_______________________________________________________35 17 CHASSIS MANUAL ADJUSTMENTS PROCEDURE __________ 37 20 SCHEMATIC DIAGRAMS 53 21 PARTS LISTS 62 18 CIRCUIT DESCRIPTION 45 19 ASSEMBLY DIAGRAM 52 ...

Страница 5: ...gnal s level is 60dB at the color bar pattern from the TV pattern generator 100 white 75 color saturation Brightness contrast and color are adjusted for normal picture performance Mains supply 220VAC 50Hz PERI TV SOCKET SCART 1 PINING 1 Audio right output 0 5Vrms 1K 2 Audio right input 0 5Vrms 10K 3 Audio left output 0 5Vrms 1K 4 Ground AF 5 Ground Blue 6 Audio left input 0 5Vrms 10K 7 Blue input ...

Страница 6: ...of the functions can also be operated from the local keyboard i e Vol Vol P P and Menu Teletext is done by the microcontroller on chip teletext module Fastext Toptext 8page One page are optional 2 SMALL SIGNAL PART WITH TDA8885 The TDA8885 combines all small signal functions required for a colour TV receiver 2 1 Vision IF amplifier The IF amplifier contains 3 ac coupled control stages with a total...

Страница 7: ...en This function is selected by means of the ICO bit sub address 28H The signal is available on pin 27 audio output pin when ICO 0 The S N ratio of the selected video signal can be read via the bits SN1 SN0 in sub address 03H 2 2 Video Switches The circuit has an input for the internal CVBS signal and 2 inputs for external CVBS or Y signals The circuit has only 1 chroma input so that it is not pos...

Страница 8: ... available A special feature is the zoom function for both the horizontal and vertical deflection and the vertical scroll function When the horizontal scan is reduced to display 4 3 pictures on a 16 9 picture tube an accurate video blanking can be switched on to obtain well defined edges on the screen Overvoltage conditions X ray protection can be detected via the EHT tracking pin When an overvolt...

Страница 9: ...ack stretcher is realised internally Blue stretch This circuit is intended to shift colour near white with sufficient contrast values towards more blue to obtain a brighter impression of the picture White stretch This function adapts the transfer characteristic of the luminance amplifier in a non linear way dependent on the picture content The system operates such that maximum stretching is obtain...

Страница 10: ...tor and the geometry processor The preferred value of Rc is 39 kW which results in a reference current of 100 mA Vref 3 9 V The value of REW must be REW RC Vscan 18 Vref Example With Vref 3 9 V Rc 39 kohm and Vscan 120 V then REW 68 kohm 2 10 SAW FILTERS SAW FILTER LIST SYSTEM STANDARD VIDEO Z 201 AUDIO Z 200 PAL SECAM BG I I K3958M K9356 PAL SECAM BG DK L L K3953M K9656M PAL MN NTSC M M3953M M937...

Страница 11: ...itching possibilities are changed through the BUS Driving 75ohm load needs an external resistor It is possible to have the same input connected to several outputs 5 MULTI STANDARD SOUND PROCESSOR The MSP 34x1G family of single chip Multistandard Sound Processors covers the sound processing of all analog TV Standards worldwide as well as the NICAM digital sound standards The full TV sound processin...

Страница 12: ...for driving controlling and protecting switching transistor of SMPS The transformer produces 150V for FBT input 14V for audio output IC S 3 3 S 5V and 8V for TDA8885 11 POWER FACTOR CORRECTION The MC33260 is a controller for Power Factor Correction pre converters meeting international standard requirements in electronic ballast and off line power conversion applications Designed to drive a free fr...

Страница 13: ...ground and Background Colours for 1 bit DRCS and 12 6 ROM Characters Shadowing Contrast Reduction Pixel by Pixel Shiftable Cursor With up to 4 Different Colours Support of Progressive Scan and 100 Hz 3 X 4Bits RGB DACs On Chip Free Programmable Pixel Clock from 10 MHz to 32MHz Pixel Clock Independent from CPU Clock Multinorm H V Display Synchronisation in Master or Slave Mode 12 7 Acquisition Feat...

Страница 14: ...to the I C bus and selected individually 14 CLASS AB STEREO HEADPHONE DRIVER TDA1308 The TDA1308 is an integrated class AB stereo headphone driver contained in a DIP8 plastic package The device is fabricated in a 1 mm CMOS process and has been primarily developed for portable digital audio applications 15 SAW FILTERS Saw filter type Model K9356M PAL SECAM B G D K I STEREO AUDIO IF K9656M PAL SECAM...

Страница 15: ...or PAL PLUS and EDTV 2 Several picture improvement features Internal base band delay line Linear RGB input and fast blanking RGB control circuit with Continuous Cathode Calibration white point and black level offset adjustment so that the colour temperature of the dark and the light parts of the screen can be chosen independently Adjustable peak white limiting circuit Possibility to insert a blue ...

Страница 16: ...rd input 35 red input for insertion 36 green input for insertion 37 blue input for insertion 38 RGB insertion input 39 luminance input 40 luminance output 41 2nd R input 42 2nd G input 43 2nd B input 44 2nd RGB insertion input 45 Additional RGB insertion input 46 Additional G input 47 Additional B signal input 48 Additional R signal input 49 Ref signal out for comb filter applications 50 decouplin...

Страница 17: ... peak to peak value 2 0 V Io HOUT horizontal output current 10 mA Io VERT vertical output current peak to peak value 1 mA Io EWD EW drive output current 1 2 mA 16 2 UV1315 UV1316 16 2 1 General description of UV1315 The UV1315 tuner belongs to the UV 1300 familiy of tuners which are designed to meet a wide range of applications It is a combined VHF UHF tuner suitable for CCIR systems B G H L L I a...

Страница 18: ...d mechanical dimensions and world standard pinning Compact size Complies to CENELEC EN55020 and EN55013 PINNING PIN VALUE 1 Gain control voltage AGC 4 0V Max 4 5V 2 Tuning voltage 3 I C bus address select Max 5 5V 4 I C bus serial clock Min 0 3V Max 5 5V 5 I C bus serial data Min 0 3V Max 5 5V 6 Not connected 7 PLL supply voltage 5 0V Min 4 75V Max 5 5V 8 ADC input 9 Tuner supply voltage 33V Min 3...

Страница 19: ...x 2Vpp Input Current 1mA Max 3mA 12 Ground 13 Output 5 5Vpp Min 4 5Vpp 14 Output 5 5Vpp Min 4 5Vpp 15 Output 5 5Vpp Min 4 5Vpp 16 Output 5 5Vpp Min 4 5Vpp 17 Output 5 5Vpp Min 4 5Vpp 18 Output 5 5Vpp Min 4 5Vpp 19 Ground 20 Input Max 2Vpp Input Current 1mA Max 3mA 16 4 TDA7265 The TDA7265 is a 25W 25W stereo sound amplifier with mute stand by facility STPA control signal coming from microcontrolle...

Страница 20: ...required at the cathode outputs are a flash resistor and a spark gap Furthermore the device needs only one power supply voltage Vdd The TDA6108Q is provided with a black current data pin 16 5 1 Features No external components only the well known supply decoupling Very simple application with a variety of colour decoders Black current measurement output for automatic black current stabilisation Onl...

Страница 21: ...the condition is VI GND to VCC 1 5 V 16 7 MC44608 16 7 1 General Description The MC44608 is a high performance voltage mode controller designed for off line converters This high voltage circuit that integrates the start up current source and the oscillator capacitor requires few external components while offering a high flexibility and reliability The device also features a very high efficiency st...

Страница 22: ...t Min 7 5V Max 18V 4 Ground Iout 2Ap p during scan 1 2Ap p during flyback 5 Driver Output resistor 8 5 Ohm sink 15 Ohm source typ 6 Supply voltage Max 16V Operating range 6 6V 13V 7 No connection 8 Line Voltage Min 50V Max 500V 16 7 MC44608 16 7 1 General Description The MC44608 is a high performance voltage mode controller designed for off line converters This high voltage circuit that integrates...

Страница 23: ...y voltage 3 3 V 12 CVBS input 1 Vpp 13 Analogue supply voltage 2 5 V 14 Analogue ground 15 Wake Interrupt Low Level 0V High Level 3 3 V 16 AV 1 status input Low Level 0V High Level 3 3 V 17 AV 2 status input Low Level 0V High Level 3 3 V 18 Shortcut protection Low Level 0V High Level 3 3 V 19 SAND input Low Level 0V High Level 3 3 V 20 ODD EVEN output Low Level 0V High Level 3 3 V 21 DVD 12 V Sens...

Страница 24: ...l 0V High Level 3 3 V 36 Analogue ground 37 Analogue supply voltage 2 5 V 38 OSD Red output 0 7 Vpp to 1 2 Vpp 39 OSD Green output 0 7 Vpp to 1 2 Vpp 40 OSD Blue output 0 7 Vpp to 1 2 Vpp 41 OSD Blanking output Low Level 0V High Level 3 3 V 42 Digital supply voltage 2 5 V 43 Ground 44 Digital supply voltage 3 3 V 45 PAL SECAM Low Level 0V High Level 3 3 V 46 Degauss Low Level 0V High Level 3 3 V 4...

Страница 25: ...ogue discrete time signal processing so no quantization noise Anti aliasing and reconstruction filters are included Input switch selects between two Y CVBS inputs Output switch selects between combed CVBS and an external Y C source Fsc as well as 2 fsc colour subcarrier signal may be applied Alignment free Few external components Low power 16 9 2 Limits Analogue supply voltage Vcc 5 5V max Analogu...

Страница 26: ... 2 DIN VDE 0110 resp IEC 664 Climatic classification 55 100 21 IEC 68 part 1 Special construction Therefore extra low coupling capacity of typical 0 2 pF high Common Mode Rejection Low temperature coefficient of CTR G Leadform 10 16 mm provides creepage distance 8 mm for TCET2100 TCET4100 optional suffix letter G is not marked on the optocoupler Coupling System U 16 11 ST24C08 16 11 1 General desc...

Страница 27: ... OFF clicks Excellent power supply ripple rejection Low power consumption Short circuit resistant High performance high signal to noise ratio high slew rate low distortion Large output voltage swing PINNING PIN VALUE 1 Output A Voltage swing Min 0 75V Max 4 25V 2 Inverting input A Vo clip Min 1400mVrms 3 Non inverting input A 2 5V 4 Ground 0V 5 Non inverting input B 2 5V 6 Inverting input B Vo cli...

Страница 28: ...es to the bus without additional hardware The built in 32 768 kHz oscillator circuit and the first 8 bytes of the RAM are used for the clock calendar and counter functions The next 8 bytes may be programmed as alarm registers or used as free RAM space The remaining 240 bytes are free RAM locations SYMBOL PIN DESCRIPTION OSCI 1 oscillator input 50 Hz or event pulse input OSCO 2 oscillator output A0...

Страница 29: ...Temperature 150 C 16 14 4 PINNING Pin1 Feedback input Pin2 Vcontrol Pin3 Oscillator capacitor Ct Pin4 Current Sense Input Pin5 Synchronization Input Pin6 GND Pin7 Gate Drive Pin8 Vcc 16 15 STV9379 16 15 1 DESCRIPTION Designed for monitors and high performance TVs the STV9379FA vertical deflection booster can handle flyback voltage up to 90V Further to this it is possible to have a flyback voltage ...

Страница 30: ...d technology In addition the MSP 34x1G includes our PANORAMA algo rithm These TV sound processing ICs include versions for processing the multichannel television sound MTS signal conforming to the standard recommended by the Broadcast Television Systems Committee BTSC The DBX noise reduction or alternatively MICRONAS Noise Reduction MNR is performed alignment free Other processed standards are the...

Страница 31: ...ithout restrictions n SCART volume in dB units optional n Additional I S input as in MSP 3400C n New FM identification as in MSP 3400C n Demodulator short programming n Auto detection for terrestrial TV sound standards n Precise bit error rate indication n Automatic switch from NICAM to FM AM or vice versa n Improved NICAM synchronisation algorithm n Improved carrier mute algorithm n Improved AM d...

Страница 32: ...tandard n Simultaneous demodulation of very high deviation FM Mono and NICAM n Adaptive deemphasis for satellite Wegener Panda acc to ASTRA specification n ASTRA Digital Radio ADR together with DRP 3510A n All NICAM standards n Korean FM Stereo A2 standard Pinning 1 ADR wordstrobe 35 Analog Shield Ground 1 2 Not connected 36 Scart input 3 in right 3 ADR data output 37 Scart input 3 in left 4 I S 1...

Страница 33: ... gain internally frequency compensated operational amplifiers which were designed specifically to operate from a single power supply over a wide range of voltages Operation from split power supplies is also possible and the low power supply current drain is independent of the magnitude of the power supply voltage Application areas include transducer amplifiers dc gain blocks and all the convention...

Страница 34: ...e chip Analog inputs 3x CVBS or 1x CVBS and 1x Y C alternatively ADC with 8 bit amplitude resolution Automatic Gain Control AGC Chroma Decoder PAL B G PAL M PAL N Argentina PAL60 NTSC M NTSC4 4 and SECAM Adjustable Chroma Saturation and Hue Control Automatic Chroma Control 24 dB 6 dB Automatic recognition of 625 lines 525 lines standard Automatic recognition of chroma standards different search st...

Страница 35: ... input for YUV RGB switch 15 SEL fast blanking output for PIP 16 OUT3 analog output chrominance signal B Y or B Y or B 17 OUT2 analog output luminance signal Y or G 18 OUT1 analog output chrominance signal R Y or R Y or R 19 VDDA2 analog supply voltage V DDA for DAC 20 VSSA2 analog ground V SS for DAC 21 VREFH reference voltage for ADC and DAC high 22 VDDA1 analog supply voltage V DDA for ADC 23 V...

Страница 36: ...AM demodulator without extra reference circuit Alignment free selective FM PLL demodulator with high linearity and low noise I C bus control for all functions I C bus transceiver with pin programmable Module Address MAD GENERAL DESCRIPTION The TDA9885 is an alignment free single standard without positive modulation vision and sound IF signal PLL The TDA9886 is an alignment free multistandard PAL S...

Страница 37: ...ST 01 White Point GREEN ADJUST 02 White Point BLUE ADJUST 03 AGC ADJUST 04 IF PLL Negative ADJUST 05 IF PLL Positive ADJUST 06 Y Delay PAL ADJUST 07 Y Delay SECAM ADJUST 08 Y Delay NTSC ADJUST 09 Y Delay OTHER ADJUST 10 4 3 Vertical Zoom ADJUST 11 4 3 Vertical Scroll ADJUST 12 4 3 Horizontal Shift ADJUST 13 4 3 Vertical Slope ADJUST 14 4 3 Vertical Amplitude ADJUST 15 4 3 S correction ADJUST 16 4 ...

Страница 38: ... 57 Subtitle S correction ADJUST 58 Subtitle Vertical Shift ADJUST 59 Subtitle EW Width ADJUST 60 Subtitle EW Parabola Width ADJUST 61 Subtitle EW Upper Corner Parabola ADJUST 62 Subtitle EW Trapezium ADJUST 63 Subtitle Horizontal Parallelogram ADJUST 64 Subtitle Bow ADJUST 65 Subtitle EW Lower Corner Parabola ADJUST 66 Zoom Vertical Zoom ADJUST 67 Zoom Vertical Scroll ADJUST 68 Zoom Horizontal Sh...

Страница 39: ... as sharp as possible and colours between transients do not mix with each other This adjustment s factory setting is 008 ADJUST 07 Y Delay SECAM Enter a SECAM B G colour and black white bar test pattern via RF Adjust Y Delay SECAM till the colour transients on the colour bar of the pattern become as sharp as possible and colours between transients do not mix with each other This adjustment s facto...

Страница 40: ...40 Cinema mode for 4 3 CRTs Subtitle mode for 4 3 CRTs Zoom mode for 4 3 CRTs 4 3 mode for 16 9 CRTs 16 9 mode for 16 9 CRTs ...

Страница 41: ...justment is correct after completing Service Mode Adjustment 4 3 VERTICAL SLOPE ADJUSTMENT ADJUST 13 4 3 Vertical Slope Enter a CROSS HATCH B G test pattern via RF Change vertical slope till the size of squares on both the upper and lower part of test pattern become equal to the squares laying on the vertical centre of the test pattern Check and readjust VERTICAL SLOPE item if the adjustment becom...

Страница 42: ...mproper after some other geometric adjustments are done 4 3 EW TRAPEZIUM ADJUSTMENT ADJUST 20 4 3 EW Trapezium Enter a PAL B G test pattern via RF Change EW Trapezium till vertical lines especially lines at the sides of the picture frame became parallel to the both sides of picture tube as close as possible Check and readjust EW Trapezium item if the adjustment becomes improper after some other ge...

Страница 43: ...STMENT ADJUST 82 TRAPEZOID ADJUSTMENT Enter a PAL B G test pattern via RF Firstly set the TILT adjustment and then change TRAPEZOID till vertical lines at the corners of lower sides of picture frame become vertical and parallel to vertical corner sides of picture tube Check and readjust TRAPEZOID item if the adjustment becomes improper after some other geometric adjustments are done note that some...

Страница 44: ...e a free frequency discontinuous mode it can also be synchronised and in any case it features very effective protections that ensure a safe and reliable operation The voltage to run the switching MOSFET Q100 is fed through L102 coil and this MOSFET runs MC33260 to run the PFC circuitry Start up resistor R101 feeds from a 500V coming from the mains through the adder diodes D104 D135 to pin 8 of IC1...

Страница 45: ...igh current over B Supply voltage by sensing the current through R144 If the current over R144 is higher then a value arranged for different CRTs e g 1 2 A for 29 RF 4 3 models then by sensing and by the B protection circuitry a voltage is applied to the pin 3 of video processor IC When the voltage at this pin is higher then 3 4V the TV switches to stand by mode 4 Another voltage protection is by ...

Страница 46: ...rks but with no PFC When servicing note that the reservoir capacitor C116 can remain charged to high voltage for some time after the AC supply is removed This can result in a shock hazard or damage to components whilst working on the receiver Do not try to test Q102 base emitter junction if C116 capacitor is charged your meter will turn on the transistor that will discharge the capacitor resulting...

Страница 47: ...d Q105 becomes off then Q107 conducts and the high voltage output value becomes lower than the NORMAL mode regulated value The shunt regulator IC116 is fully OFF In the SMPS stand by mode all the SMPS outputs are lowered except for the low voltage output that supply the wake up circuit located at the isolated side of the power supply In that mode the secondary regulation is performed by the zener ...

Страница 48: ...ntroller is fed through the sensor on the keyboard front panel in front of the cabinet to pin 24 of the micro controller Operations on the customer front panel keys are detected by pin 4 5 6 7 those are ADCs analogue to digital converter Pressing a switch will connect the 3 3V to the ground through a particular resistor that makes a voltage on the dedicated pin for that switch at that instant and ...

Страница 49: ... the text graphics are output as R G B signals on pins 38 39 40 of the micro and fed to pins 35 36 37 of IC200 At the same time pin 41 of the micro goes high taking pin 38 of IC200 high blanking the picture and selecting text R G B input Also in the text mode pin 20 of micro sends synchronous odd even signal to make the odd and even picture rows intersect with each other by affecting the non inver...

Страница 50: ...eripherals to give audio input IC706 is used as a audio switch IC In IC701 the main right and left audio signals are amplified and then given to the speakers If the mute signal from the micro controller comes the amplifier is muted with hardware the sound processor with software as well R G B The R G B signals from pins 7 11 and 15 of the SCART connectors PL207 are fed to the R G B input pins 41 4...

Страница 51: ...CRT anode The end of the winding Pin 10 is returned to IC200 Pin 34 here according to the beam current info low or high brightness and contrast of the picture is set not to load the CRT with edge and maximum ratings The beam current drawn by the CRT passes through Q602 and develops a voltage on the collector proportional to the current V IxR The voltage on the collector will vary depending on the ...

Страница 52: ...52 ...

Страница 53: ...Audio Circuit 53 ...

Страница 54: ...SVM Circuit 54 ...

Страница 55: ...CRT 55 ...

Страница 56: ...Deflection Circuit 200V 9 00 56 ...

Страница 57: ...Dynamic Focus 57 ...

Страница 58: ...IF and Video 58 ...

Страница 59: ...Jack 59 ...

Страница 60: ...Micro Controller 60 ...

Страница 61: ...SMPS 61 ...

Страница 62: ...THE UPDATED PARTS LIST FOR THIS MODEL IS AVAILABLE ON ESTA ...

Страница 63: ...47 Milano Italia ITALY Tel 39 02 487861 Tel 39 02 38073415 Servizio Clienti Fax 39 02 48786381 2 Email customerservice italy hitachi eu com HITACHI Europe AB Box 77 S 164 94 Kista SWEDEN Tel 46 0 8 562 711 00 Fax 46 0 8 562 711 13 Email csgswe hitachi eu com HITACHI EUROPE S A S Lyon Office B P 45 69671 BRON CEDEX FRANCE Tel 33 04 72 14 29 70 Fax 33 04 72 14 29 99 Email france consommateur hitachi...

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