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CP-850/F Service Manual

-58-

Mute : In this mode the amplifier is DC biased but not operational (no audio output). This allows the input coupling
capacitors to be charged to avoid pop-noise. The devices is in mute mode when 2.5 V < VMODE < (Vcc-1.5 V).

Operating : In this mode the amplifier is operating normally. The operating mode is activated at VMODE < 0.5 V.

5.8 VERTICAL DEFLECTION
The vertical driver circuit is a bridge configuration. The deflection coil is connected between the output amplifiers, which
are driven in phase opposition. The differential input circuit is voltage driven. The input circuit is especially intended for
direct connection to driver circuits which deliver symmetrical current signals, but is also suitable for asymmetrical
currents. The output current of these devices is converted to voltages at the input pins via resistors R350 and R351.
The differential input voltage is compared with the output current through the deflection coils measured as voltage
across R302, which provides internal feedback information. The voltage across R302 is proportional to the output
current.

5.8.1

FLYBACK VOLTAGE

The flyback voltage is determined by an additional supply voltage Vflb. The principle of operation with two supply
voltages (class G) makes it possible to fix the supply voltage Vp optimum for the scan voltage and the second supply
voltage Vflb optimum for the flyback voltage. Using this method, very high efficiency is achieved. The supply voltage
Vflb is almost totally available as flyback voltage across the coil, this being possible due to the absence of a coupling
capacitor.

5.8.2

PROTECTION

The output circuit has protection circuits for :

- Too high die temperature
- overvoltage of output stage A

5.8.3

GUARD CIRCUIT

The guard signal is not used by the video IC to blank the screen in case of fault condition.

5.8.4

DAMPING RESISTOR 

For HF loop stability a damping resistor (R331) is connected across the deflection coil.

5.8.5

EAST-WEST AMPLIFIER (TDA8358J ONLY)

The East-West amplifier is current driven. It can only sink currents of the diode modulator circuit. 
A feedback resistor R397 is connected between the input and output of this inverting amplifier in order to convert the
East-West correction input into an output voltage.

Содержание DTK-28 Series

Страница 1: ...be changed for improving their performance without notice in the parts list So if you need the latest parts information please refer to PPL Parts Price List in Service Information Center S M No TCP85...

Страница 2: ...14 3 4 5 VERTICAL GEOMETRY 14 3 4 6 HORIZONTAL PICTURE CENTRING 14 3 4 7 EAST WEST CORRECTION 14 3 4 8 AGC 15 4 IC DESCRIPTION 16 4 1 TELETEXT DECODER WITH EMBEDDED 8 BIT CONTROLLER 16 4 1 1 BLOCK DI...

Страница 3: ...4 10 1 GENERAL DESCRIPTION 42 4 10 2 FEATURES 42 4 10 3 BLOCK DIAGRAM 42 4 10 4 ELECTRICAL CHARACTERISTICS 43 5 CP 850 F CHASSIS DESCRIPTION 45 5 1 BLOCK DIAGRAM 45 5 2 IF SECTION 46 5 2 1 BLOCK DIAG...

Страница 4: ...51 5 3 2 10 Analog Back End 52 5 3 2 11 Analog RGB Insertion 52 5 3 2 12 CRT Measurement and Control 52 5 3 2 13 Synchronization and Deflection 53 5 3 2 14 EHT Compensation 53 5 4 MICROCONTROLLER 53 5...

Страница 5: ...5 8 5 EAST WEST AMPLIFIER TDA8358J ONLY 58 6 SERVICE PARTS LIST 59 7 SCHEMATIC DIAGRAM 66 8 PRINTED CIRCULT BOARD 67 9 EXPLODED VIEW 69 CP 850 F Service Manual 4...

Страница 6: ...synthesiser tuning system Visual screen size 28 66cm 29 68cm Channel indication On Screen Display Program Selection 100 programmes Aux terminal EURO SCART 1 Audio Video In and Out R G B In Slow and Fa...

Страница 7: ...CP 850 F Service Manual 6 1 2 CHANNEL FREQUENCY TABLE 1 2 1 CHANNEL FREQUENCY TABLE...

Страница 8: ...9 25 C28 527 25 527 25 527 25 527 25 C29 535 25 535 25 535 25 535 25 C30 543 25 543 25 543 25 543 25 C31 551 25 551 25 551 25 551 25 C32 559 25 559 25 559 25 559 25 C33 567 25 567 25 567 25 567 25 C34...

Страница 9: ...75 167 25 161 25 S10 168 25 212 75 168 25 S11 231 25 224 75 231 25 S12 238 25 236 75 238 25 S13 245 25 248 75 255 25 245 25 S14 252 25 260 75 263 25 252 25 S15 259 25 272 75 271 25 259 25 S16 266 25 2...

Страница 10: ...rograms found are then sorted in 4 groups Group I It contains all the programs from the selected country and named by the TV controlling software Within this group the sorting order is fixed by the AT...

Страница 11: ...ware first sweeps all TV bands with Europe system selected negative video modulation and then a second time with France system selected positive video modulation Special case GB Note for satellite rec...

Страница 12: ...king on high voltage equipment Discharge the high potential of the picture tube before handling the tube The picture tube is highly evacuated and if broken glass fragments will be violently expelled I...

Страница 13: ...le trough option bits OK key Toggle bits in option byte Order Item Default setting 1 HOR CEN 2 RED GAIN 3 GRN GAIN 4 RED BIAS 5 GRN BIAS 6 AGC LEVEL 7 G2 SCREEN 8 AFT 9 OPTION1 10 OPTION2 11 OPTION3 1...

Страница 14: ...n from the nominal channel frequency Find AFT item in service mode Adjust the coil L150 to bring the cursor to central position 32 3 4 2 G2 ALIGNMENT Tune a colour bar pattern Find the G2 SCREEN item...

Страница 15: ...he best resolution on screen 3 4 5 VERTICAL GEOMETRY Adjust V LINEAR linearity S CORRECT S Correction VERT SIZE Vertical amplitude VERT CENT vertical centring to compensate for vertical distortion 3 4...

Страница 16: ...chassis See above how to change option bits Adjust the antenna signal level at 62 dB V 2 Tune a colour bar pattern Find the AGC item in service mode Press the key OK on the remote keypad and wait unti...

Страница 17: ...ed Caption an accelerating acquisition hardware module a display generator for Level 1 5 TTX data and powerful On screen Display capabilities based on parallel attributes and Pixel oriented characters...

Страница 18: ...switching control for SCART 1 16 AGC IN ADC input for AGC alignment only 17 KEY IN ADC input local key sensing 18 AFT IN ADC input AFT input 19 HS IN Horizontal sync for OSD Txt synchronisation 20 VS...

Страница 19: ...ut 41 BK OUT OUT Blanking 42 VDD2 5 IN Supply voltage 2 5V 43 VSS IN Ground 0V 44 VDD3 3 IN Input Output 3 3V 45 n c 46 n c 47 n c 48 AGC OUT Tuner TOP adjustment 49 FACTORY 50 D G COIL 51 LED OUT Hig...

Страница 20: ...OF THE VSP9405C VSP 94x5C 4 2 2 DESCRIPTION Integrated Video Matrix switch Up to seven CVBS inputs up to two Y C inputs Up to three CVBS outputs even when Y C input 9 bit amplitude resolution for CVB...

Страница 21: ...ignal Not used in this chassis Scaling factors 3 2 pixel resolution 0 75 including 16 9 compatibility 5 zone panorama generator Embedded memory On chip memory controller Embedded DRAM core for field m...

Страница 22: ...56CLK I O Leave open Digital input output clock 10 16 656IO7 I O Leave open Digital input output MSB d a p V 0 l a t i g i d r o f e g a t l o v y l p p u S S 2 P S S V 9 1 1 1 d a p V 3 3 l a t i g i...

Страница 23: ...CP 850 F Service Manual 22...

Страница 24: ...CP 850 F Service Manual 23...

Страница 25: ...CP 850 F Service Manual 24...

Страница 26: ...CP 850 F Service Manual 25...

Страница 27: ...ERT Output Input Sense Input Security Unit Picture Improve ment Y Cb Cr Y Cb Cr Y Cb Cr R G B R G B R G B R G B R G B R G B Pr Y Pb FBL R G B FBL SVM SVM analog RGB Matrix 4 3 DDP 3315C DISPLAY AND DE...

Страница 28: ...adjustment cutoff drive histogram calculation Deflection Processing scan velocity modulation output digital EHT compensation for vertical east west soft start stop of horizontal drive vertical angle a...

Страница 29: ...n appropriate yoke a scan velocity modulation SVM signal is calculated using a differentiated luminance signal Two analog sources can be inserted in the main RGB controlled by separate fastblank FBL s...

Страница 30: ...d Enable 18 FIFOWR O FIFO Write Enable 19 FIFORWR O FIFO Write Counter Reset 20 PWM1 O I2C controlled DAC 21 PWM2 O I2C controlled DAC Tilt output 22 PWMV O I2C controlled DAC 23 HOUT O Horizontal dri...

Страница 31: ...nput 55 RIN2 PR I Analog Red2 input PR Input 56 GIN2 Y I Analog Green2 input Y Input 57 BIN2 PB I Analog Blue2 input PB Input 58 ASG2 S Analog Shield Ground 59 HCS I Half Contrast 60 NC 61 TEST I 62 R...

Страница 32: ...standards Precise bit error rate indication Automatic switching from NICAM to FM AM or vice versa Improved NICAM synchronisation algorithm Improved carrier mute algorithm Improved AM demodulation Red...

Страница 33: ...format of the socalled Near Instantaneous Companding System NICAM 728 Transmission is performed using Differential Quadrature Phase Shift Keying DQPSK Table below offers an overview of the modulation...

Страница 34: ...Pin connections and short description Pin No Pin Name Type Short description 1 NC Not Connected 2 NC Not Connected 3 NC Not Connected 4 INT Out Interrupt out 5 MUTE Out Mute out 6 ADR_SEL In I2C bus A...

Страница 35: ...citor AUX 39 AHVSUP Analog power supply 8 0V 40 CAPL_M Volume capacitor MAIN 41 AHVSS Analog ground 42 AGNDC Analog reference voltage high voltage part 43 NC Not Connected 44 NC Not Connected 45 NC No...

Страница 36: ...ection and for positive modulation peak white black level detector Tuner AGC with adjustable take over point Alignment free quasi parallel sound QPS mixer for FM NICAM sound IF signals Intercarrier ou...

Страница 37: ...VIF amp Loop filter comp optional 4 9 16 AM det FM det 25 24 17 Cref 23 13 22 19 6 7 8 15 11 10 27 28 3 1 2 SIF 1 CAGC 5 Standard Video det VIF CAGC CBL AGC VIF Tuner AGC AGC SIF Tuner SIF 2 SIF inpu...

Страница 38: ...w standby current High supply voltage ripple rejection Outputs short circuit protected to ground supply and across the load Thermally protected Pin description Pin Symbol Description 1 OUT1 negative l...

Страница 39: ...S devices MOS transistors are used in the output stage because of the absence of second breakdown 4 7 1 TDA8358J An East West output stage is provided that is able to sink current from the diode modul...

Страница 40: ...5 6 7 8 9 10 11 12 13 TDA8358J Icomp V0 guard Vp 9 3 M5 D3 D2 10 M2 M4 M1 5 2 Vi diff Vi sb Vi diff Vi diff Vi sb Vi diff IiEW top IiEW bot Vi neg 1 input feedback Vi neg Vi pos M3 M6 8 4 7 6 12 D1 1...

Страница 41: ...ypical bandwidth of 9 0 MHz for an output signal of 60 V p p High slew rate of 1850V No external components required Very simple application Single supply voltage of 200V Internal reference voltage of...

Страница 42: ...k 7 WC Write control 8 Vcc Supply voltage 4 Vss Ground The memory device is compatible with the I2C memory standard This is a two wire serial interface that uses a bi directional data bus and serial c...

Страница 43: ...es by Automatic Switching Quasi Resonant Mode for Normal Operation Burst Mode for Standby Operation or Light Loads Automatic or Manually Triggered Burst Standby Input Power 0 1 W at No Load Low Operat...

Страница 44: ...CP 850 F Service Manual 43 4 10 4 ELECTRICAL CHARACTERISTICS at TA 25 C VCC 20 V voltage measurements are referenced to S GND terminal unless otherwise specified...

Страница 45: ...CP 850 F Service Manual 44...

Страница 46: ...CP 850 F Service Manual 45 5 CP 850 F CHASSIS DESCRIPTION 5 1 BLOCK DIAGRAM...

Страница 47: ...CP 850 F Service Manual 46 5 2 IF SECTION 5 2 1 BLOCK DIAGRAM...

Страница 48: ...event of decreasing VIF input signal The control voltage AGC voltage at Pin 8 is transferred to an internal control signal and is fed to the tuner AGC to generate the tuner AGC current at Pin 11 open...

Страница 49: ...er to provide a constant SIF signal to the AM demodulator and QPS mixer 5 2 7 QUASI PARALLEL SOUND QPS MIXER The QPS mixer is realised by a multiplier The SIF signal FM or NICAM carrier is converted t...

Страница 50: ...detection The TV controller software has configured the colour decoder to operate in automatic detection mode When the signal source comes from the tuner only SECAM and PAL 50Hz standard are enabled I...

Страница 51: ...Cr Cb multiplexed with separate H V syncs and clock ITU R 656 format The data inputs Y0 Y7 and C0 C7 are clocked with the external clock LLC2 The clock frequency is 54 MHz for 8 bit data input The hor...

Страница 52: ...cessing The contour correction signal calculated in this block is limited to the adjacent extreme values to prevent over and undershoots The LTI features an adjustable gain control and an adjustable c...

Страница 53: ...nds on the fast blank input signal 5 3 2 12 CRT Measurement and Control In order to define accurate colour on different CRT displays the cut off and white drive settings are adjusted in factory depend...

Страница 54: ...zation and Deflection The deflection processing generates the signals for the horizontal and vertical drive This block contains two numeric phase locked loops and a security unit PLL2 generates the ho...

Страница 55: ...ION TABLE PIN NAME CONFIGURATION DESCRIPTION STAND BY TV ON 3 S SW2 Open Drain Open Drain 4 S SW2 Open Drain Open Drain 5 S SW1 Open Drain Open Drain 6 S SW1 Open Drain Open Drain 8 RESET out Low Open...

Страница 56: ...ere are only 8 codes available to cover all the possible language combinations This means that for a received code there are several possibilities meanings according to the local code of practice This...

Страница 57: ...East Euro Bulgarian 0 0 0 English Russian Cyrillic 0 0 1 German German West Euro 0 1 0 Estonian Estonian East Euro 0 1 1 Lettish Lettish East Euro 1 0 0 Russian English Cyrillic 1 0 1 Ukrainian Engli...

Страница 58: ...c switching the threshold levels mono to stereo and stereo to mono is different When the sound mode change the MSP firmware informs the microcontroller by rising pin 4 This generates an interrupt to t...

Страница 59: ...rmation The voltage across R302 is proportional to the output current 5 8 1 FLYBACK VOLTAGE The flyback voltage is determined by an additional supply voltage Vflb The principle of operation with two s...

Страница 60: ...2KV R 680PF K 125C C812 CH1BFE332M C CERA AC 4 0KV 3300PF M SD AC250V C813 CEXF2E101V C ELECTRO 250V RSS 100MF 18X35 5 C814 CEXF2E470V C ELECTRO 250V RSS 47MF 16X25 C818 CMYF2J224J C MYLAR 630V MPP 0...

Страница 61: ...RA 50V X7R 0 1MF K 1608 CC523 HCBK104KBA C CHIP CERA 50V X7R 0 1MF K 1608 CC524 HCBK102KBA C CHIP CERA 50V X7R 1000PF K 1608 CC526 HCQK220JBA C CHIP CERA 50V CH 22PF J 1608 CC527 HCQK220JBA C CHIP CER...

Страница 62: ...LET BSR T0 2 R1 6 SMALL E45 4856310300 EYE LET BSR T0 2 R1 6 SMALL E46 4856310300 EYE LET BSR T0 2 R1 6 SMALL E47 4856310300 EYE LET BSR T0 2 R1 6 SMALL E48 4856310300 EYE LET BSR T0 2 R1 6 SMALL E49...

Страница 63: ...2SA1980Y Q543 T2SA1980Y TR 2SA1980Y Q544 T2SA1980Y TR 2SA1980Y Q550 T2SC5343Y TR 2SC5343Y Q601 T2SA1980Y TR 2SA1980Y Q603 T2SA1980Y TR 2SA1980Y Q604 T2SC5343Y TR 2SC5343Y Q605 T2SC5343Y TR 2SC5343Y Q...

Страница 64: ...060GY WIRE COPPER 1 0 6 TIN COATING J331 85801060GY WIRE COPPER 1 0 6 TIN COATING J332 85801060GY WIRE COPPER 1 0 6 TIN COATING J336 85801060GY WIRE COPPER 1 0 6 TIN COATING J337 85801060GY WIRE COPPE...

Страница 65: ...3 5MM K LAL02TB L744 5CPZ100K02 COIL PEAKING 10UH 3 5MM K LAL02TB L801 5MC0000100 COIL BEAD MD 5 HC 3550 LA01 5CPZ100K04 COIL PEAKING 10UH 10 5MM K LAL04TB LA02 5CPZ100K04 COIL PEAKING 10UH 10 5MM K...

Страница 66: ...1 4 47 OHM J R841 RD 2Z470J R CARBON FILM 1 2 47 OHM J R855 RD AZ222J R CARBON FILM 1 6 2 2K OHM J R860 RN 4Z1302F R METAL FILM 1 4 13K OHM F R861 RD 4Z103J R CARBON FILM 1 4 10K OHM J R862 RD AZ102J...

Страница 67: ...CP 850 F Service Manual 66 7 SCHEMATIC DIAGRAM CP 850 F...

Страница 68: ...CP 850 F Service Manual 67 8 PRINTED CIRCULT BOARD...

Страница 69: ...68 CP 850 F Service Manual PRINTED CIRCULT BOARD...

Страница 70: ...CP 850 F Service Manual 69 9 EXPLODED VIEW...

Страница 71: ...DAEWOO ELECTRONICS CORP PRINTED DATE JUN 2006 686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA...

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