Daewoo DTX-21B4 Service Manual Download | Manualshive

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CP-520

V

Service Manual

27

Pinning

Pin

Symbol

Description

1

Vin(-) Inverting Input

2

Vcc

Supply voltage

3

Pump Up Out Pump Up Out

4

-14V

-14V

5

Vout

Ver. Output

6

Vcc

Output Stage Vcc

7

Vin(+)

Non Inv. Input

Block diagram

LA78040

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Summary of Contents for DTX-21B4

Page 1: ...ng 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 Service Manual COLOR Television CHASSIS Model CP 520V DTX 21G2 21B4 21U7 P N TCP520VEF0 Dec 2006 ...

Page 2: ...NVM DEFAULT SETTING 12 3 7 TV SET ALIGNMENT 14 3 7 1 G2 ALIGNMENT 14 3 7 2 WHITE BALANCE 14 3 7 3 FOCUS 14 3 7 4 VERTICAL GEOMETRY 14 3 7 5 HORIZONTAL PICTURE CENTRING 14 3 7 6 AGC 14 4 IC DESCRIPTION 15 4 1 UOC III SERIES 15 4 1 1 IC MARKING AND VERSION 15 4 1 2 BLOCK DIAGRAM 16 4 1 3 PINNING 17 4 1 4 FEATURES 20 4 2 LA42032 STEREO AUDIO AMPLI FIER 23 4 2 1 FEATURES 24 4 3 LA78040 VERTICAL AMPLIF...

Page 3: ...36 5 2 8 Chroma luminance and feature processing 36 5 2 9 Colour decoder 37 5 2 10 RGB output circuit 38 5 2 11 I2C BUS USER INTERFACE DESCRIPTION 40 5 3 GENERAL DESCRIPTION OF THE TV SOUND OF SOUND PROCESSOR 40 5 3 1 Supported standards 41 5 4 FUNCTIONAL DESCRIPTION SOUND PROCESSOR 42 5 4 1 The UOC III TV Sound Concept 42 5 4 2 Functional Overview Of the digital controller sound part 43 5 4 3 Dem...

Page 4: ...CP 520V Service Manual 3 DOCUMENT HISTORY VERSION DATE COMMENTS V1 46 07 07 06 Creation of document Author JS KIM for project CP520 50Hz TV ...

Page 5: ... Visual screen size 51cm 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 Fast switching EURO SCART 2 Audio Video In and Out SVHS In AV3 Audio Video Jack on front of cabinet Headphone jack 3 5 mm on front of cabinet SVHS3 option Jack on front of cabinet sound input common with AV3 Remote Control Unit R 49C10 1 ...

Page 6: ...Video Input 1 Vpp 3dB Impedance 75Ω 21 Common Earth 1 1 3 EURO SCART 2 21 Pin Pin Signal Description Matching value 1 Audio Output Right 0 5 Vrms Impedance 1 kΩ RF 54 Mod 2 Audio Input Right 0 5 Vrms Impedance 10 kΩ 3 Audio Output Left 0 5 Vrms Impedance 1 kΩ RF 54 Mod 4 Audio Earth 5 Earth 6 Audio Input Left 0 5 Vrms Impedance 10 kΩ 7 N C 8 N C 9 N C 10 N C 11 N C 12 N C 13 Earth 14 Earth 15 Chro...

Page 7: ...20 C21 471 25 471 25 471 25 471 25 C22 479 25 479 25 479 25 479 25 C23 487 25 487 25 487 25 487 25 C24 495 25 495 25 495 25 495 25 C25 503 25 503 25 503 25 503 25 C26 511 25 511 25 511 25 511 25 C27 519 25 519 25 519 25 519 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 56...

Page 8: ... 25 815 25 815 25 815 25 C65 823 25 823 25 823 25 823 25 C66 831 25 831 25 831 25 831 25 C67 839 25 839 25 839 25 839 25 C68 847 25 847 25 847 25 847 25 C69 855 25 855 25 855 25 855 25 C70 863 25 863 25 863 25 863 25 C71 69 25 C72 76 25 C73 83 25 C74 90 25 C75 97 25 C76 59 25 C77 93 25 S01 105 25 104 75 103 25 105 25 S02 112 25 116 75 111 25 112 25 S03 119 25 128 75 119 25 119 25 S04 126 25 140 75...

Page 9: ...343 25 S27 351 25 351 25 351 25 351 25 S28 359 25 359 25 359 25 359 25 S29 367 25 367 25 367 25 367 25 S30 375 25 375 25 375 25 375 25 S31 383 25 383 25 383 25 383 25 S32 391 25 391 25 391 25 391 25 S33 399 25 399 25 399 25 399 25 S34 407 25 407 25 407 25 407 25 S35 415 25 415 25 415 25 415 25 S36 423 25 423 25 423 25 423 25 S37 431 25 431 25 431 25 431 25 S38 439 25 439 25 439 25 439 25 S39 447 2...

Page 10: ...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 If any Fuse in this TV receiver is blown replace it with the FUSE specified in the Replacement Parts List When replacing a high wattage resistor metal oxide film resistor in the circuit board keep the resistor 10 mm away from circui...

Page 11: ...c Increment the values within range Cycle trough option bits OK key Toggle bits in option byte Order Item Default setting 1 HOR CEN 2 RED GAIN 3 GRN GAIN 4 BLUE GAIN 5 RED BIAS 6 GRN BIAS 7 AGC LEVEL 8 G2 SCREEN 9 OPTION1 10 OPTION2 11 AVL 12 PARABOLA 13 HOR WIDTH 14 CORNER T 15 CORNER B 16 HOR PARAL 17 V LINEAR 18 V SLOPE 19 EW TRAPEZ 20 S CORRECT 21 VERT CENT 22 VERT SIZE 3 3 MICROCONTROLLER CON...

Page 12: ...ips 01 Not used 10 Alps LG 11 Parstnic SS 3 5 OPTION 2 B7 B6 B5 B4 B3 B2 B1 B0 1 JVC remote control AVL control OFF PICTURE TILT ON 5 keys local keyboard Full ATSS Double Window Enabled 0 Fixed to 0 Daewoo Remote control AVL control ON PICTURE TILT OFF 7 keys lacal keyboard Basic ATSS Double Window Disabled n u Must be set to 1 for future compa tibility OPTION CHASSIS MODEL OPTION BIT b7 b0 DW hex...

Page 13: ...TV set 3 Entering into NVM EDITOR mode To switch the TV set into NVM EDITOR mode use the user remote control and press on PICTURE OK key The NVM EDITOR window will appear on the screen This mode allow you to access all data stored in NVM The current NVM address is given in column ADDR in both DECimal and HEXadecimal format The column DATA gives the value contained at selected address in both DECim...

Page 14: ...0x2E 14 Nor1_Colour 0x64C 0x1C 15 Nor1_Sharpness 0x64D 0x23 16 Nor1_Tint 0x64E 0x20 17 Nor1_JVC_Bri 0x64F 0x2D 18 Nor1_JVC_Cont 0x650 0x2A 19 Nor1_JVC_Colour 0x651 0x1B 20 Nor1_JVC_Sharp 0x652 0x23 21 Nor2_Bright 0x653 0x28 22 Nor2_Contrast 0x654 0x13 23 Nor2_Colour 0x655 0x19 24 Nor2_Sharpness 0x656 0x1B 25 Nor2_Tint 0x657 0x20 26 PresetGainRGB 0x673 0x2A 27 PresetGainRGB 0x674 0x2A 28 PresetGain...

Page 15: ...3 7 4 VERTICAL GEOMETRY Adjust V LINEAR linearity S CORRECT S Correction VERT SIZE Vertical amplitude VERT CENT vertical centring to compensate for vertical distortion 3 7 5 HORIZONTAL PICTURE CENTRING Adjust HOR CEN Horizontal centre to have the picture in the centre of the screen 3 7 6 AGC Make sure option bits are correct for the tuner fitted on the chassis See above how to change option bits A...

Page 16: ...text memory Multi standard stereo decoder BTSC stereo decoder Digital sound processing circuit Digital video processing circuit 4 1 1 IC MARKING AND VERSION Chassis IC marking OSD languages ATSS countries Text CP 520V BULGARIAN CZECH GERMAN DANISH SPANISH FRENCH FINNISH ENGLISH GREEK HUNGARIAN ITALIAN NORWEGIAN DUTCH POLISH ROMANIAN RUSSIAN SWEDISH SLOVAKIAN Austria Belgium Switzerland Czech Repub...

Page 17: ...CP 520V Service Manual 16 4 1 2 BLOCK DIAGRAM ...

Page 18: ... bus data line 21 P1 6 SCL port 1 6 or I2C bus clock line 22 P1 3 T1 port 1 3 or Counter Timer 1 input 23 P0 0 I2SDI1 O port 0 0 or I2S digital input 1 or I2S digital output 24 P0 1 I2SDO1 port 0 1 or I2S digital output 1 25 P0 2 I2SDO2 port 0 2 or I2S digital output 2 26 P0 3 I2SCLK port 0 3 or I2S clock 27 P0 4 I2SWS port 0 4 or I2S word select 28 VSSC2 Ground 29 VDDC2 digital supply to core 1 8...

Page 19: ...SO CSY flyback input sandcastle output or composite H V timing output 64 SVM scan velocity modulation output 65 CVBSO PIP CVBS PIP output 66 AUDOUTHPR audio output for headphone channel right signal 67 AUDOUTHPL audio output for headphone channel left signal 68 AUDOUTLSR audio output for audio power amplifier right signal 69 AUDOUTLSL audio output for audio power amplifier left signal 70 C2 C3 chr...

Page 20: ...IF amplifier 102 IREF reference current input 103 VSC vertical sawtooth capacitor 104 VIFIN2 IF input 2 105 VIFIN1 IF input 1 106 VDRA vertical drive A output 107 VDRB vertical drive B output 108 EWD AVL 1 East West drive output or AVL capacitor 109 DECBG bandgap decoupling 110 SECPLL SECAM PLL decoupling 111 GND1 ground 1 for TV processor 112 PH1LF phase 1 filter 113 PH2LF phase 2 filter 114 VP1 ...

Page 21: ...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 ...

Page 22: ...ereo SPEAKER output with digital controls AVL Automatic Volume Levelling circuit for the headphone channel Digital input crossbar switch for all digital signal sources and destinations Digital output crossbar for exchange of channel processing functionality Digital audio input interface stereo I2S input interface Digital audio output interface stereo I2S output interface Audio interfaces and switc...

Page 23: ...r channels stereo versions with Audio DSP Extended Pseudo Stereo EPS 5 Extended Spatial Stereo ESS 6 Virtual Dolby Surround VDS 422 423 1 SRS 3D and SRS TruSurround 4 RDS RBDS Demodulation of the European Radio Data system RDS or the USA Radio Broadcast Data System RBDS signal RDS and RBDS block detection Error detection and correction Fast block synchronisation Synchronisation control flywheel Mo...

Page 24: ...nd Enhanced OSD modes Features of level 1 5 WST and US Close Caption 50Hz 60Hz display timing modes Two page operation for 16 9 screens Serial and Parallel Display Attributes Single Double Quadruple Width and Height for characters Smoothing capability of both Double Size Double Width Double Height characters Scrolling of display region Variable flash rate controlled by software Soft colours using ...

Page 25: ...ription 1 R F Rin GND Lin STB Mute Vcc Lo Lo GND Ro Ro N C Ripple Filter 2 Right input 3 Ground 4 Left Input 5 Standby 6 Mute 7 Supply Voltage 8 Positive Left output 9 Negative Left Output 10 Ground 11 Negative Right Output 12 13 Positive Right Output Not Connected 1 2 3 4 5 6 7 8 9 10 11 12 13 R F Rin GND Lin STB Mute Vcc Lo Lo GND Ro Ro N C MBK932 LA42032 ...

Page 26: ...CP 520V Service Manual 25 Block diagram LA42032 ...

Page 27: ...ure tubes The IC contains a vertical deflection output circuit operating as a high efficiency class G system The full bridge output circuit allows DC coupling of the deflection coil in combination with single positive supply voltages 4 3 1 FEATURES Built in pump up circuti for low power dissipation Vertical output circuit Thermal protection circuit 1 2 3 4 5 6 7 Vin Vcc Pump Up Out 14V Vout LA7804...

Page 28: ...Service Manual 27 Pinning Pin Symbol Description 1 Vin Inverting Input 2 Vcc Supply voltage 3 Pump Up Out Pump Up Out 4 14V 14V 5 Vout Ver Output 6 Vcc Output Stage Vcc 7 Vin Non Inv Input Block diagram LA78040 ...

Page 29: ...dress Input Output 6 SCL Serial clock 7 WP 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 clock The memory carries a built in 4 bit unique device type identifier code 1010 in accordance with the I2C bus definition Serial Clock SCL The SCL input is used to...

Page 30: ... incorporates a primary control and drive circuit with an avalanche rated power MOSFET 4 5 2 FEATURES 4 5 3 BLOCK DIAGRAM Auto Bias Function Stable Burst Operation Without Generating Interference Internal Off Timer Circuit Built In Constant Voltage Drive Multiple Protections Pulse by Pulse Overcurrent Protection Overload Protection with Auto Recovery Latching Overvoltage Protection Undervoltage Lo...

Page 31: ... 7 10 6 V Circuit Current in Non Operation ICC OFF VCC A µ 0 0 1 V 5 1 Normal Operation Drain Source Breakdown Voltage V BR DSS ID V 0 5 6 A µ 0 0 3 Drain Leakage Current IDSS VDS A µ 0 0 3 V 0 5 6 On State Resistance rDS on ID 1 9 A TJ 25 C 0 96 Ω t e m i T g n i h c t i w S f 400 ns I t n e r r u C t i u c r i C CC ON 6 0 mA Oscillation Frequency fosc 19 22 25 kHz Bottom Skip Oper Threshold Volt...

Page 32: ... 5 8 V OLP Operation Current ISSOLP 6 0 11 16 µA Overcurrent Detect Threshold Volt VOCPBD LIM 0 895 0 940 0 995 V OCP BD Pin Current IOCPBD 40 100 250 µA Latch Holding Current ICC H VCC 29 9 VCC OFF 0 3 V 45 140 mA Latch Release Voltage VCC L VCC 29 9 6 V 6 0 7 2 8 5 V Other Thermal Resistance RθJF Output junction to frame 1 6 C W Limits Characteristic Symbol Test Conditions Min Typ Max Units ...

Page 33: ...CP 520V Service Manual 32 5 CIRCUIT DESCRIPTION 5 1 BLOCK DIAGRAM ...

Page 34: ...realisedbyamultiplier 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 suppliedtotheoutputviaahigh passfilterforattenuation of the residual video signals With this system a high performance hi fi stereo sound processing can be achieved TheAMsounddemodulatorisrealisedbyamultiplier T...

Page 35: ...ion is made with the bits SAS2 0 SO2 0 and HPO2 0 AV stereo versions without Audio DSP have no headphone output The input signal selection for the volumecontrolledaudiooutputsisrealisedbytheHPO2 0 bits The gain from an external audio input to each of the non controlled analog output is 0 or 6dB controlled by the DSG bit A supply voltage of 5V allows input and output amplitude of 1VRMS full scale a...

Page 36: ...g of the displayed picture the input signal of the sync separator is not derived from the various CVBS Y or RGB YPrPb 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 ...

Page 37: ...n Vertical shift n Vertical zoom n Vertical scroll n Vertical linearity correction When required the linearity setting for the upper and lower part of the screen can have a different setting n Horizontal shift n EW width n EW parabola width n EW upper and lower corner parabola correction n EW trapezium correction n Horizontal parallelogram and bow correction When the East West geometry function is...

Page 38: ...mic skin tone flesh control This function is realised in the YUV domain by detecting the colours near to the skin tone n Scan Velocity modulation output Also the SVM function can be activated for all incoming CVBS Y C and RGB YPrPb signals The delay between the RGB output signals and the SVM output signal can be adjusted by means of the SVM2 SVM0 bits in subaddress 48H so that an optimum picture p...

Page 39: ...ce to th edigita ldie Via this loop digital features like double window are added A tint control is available for the base band U V signals For this reason this tint control can be activated for all colour standards The signals for OSD and text are internally supplied to the control circuit The output signal has an amplitude of about 1 2V black to white at nominal input signals and nominal setting...

Page 40: ...ication can be read from the status byte 01 and can be used for automatic adjustment of the Vg2 voltage during the production of the TV receiver During this test the vertical scan remains active so that the indication of the 2 bits can be made visible on the TV screen The control circuit contains a beam current limiting circuit and a peak white limiting circuit The control is realised by means of ...

Page 41: ...via auto increment mode no address can be used and all registers must be read 5 3 GENERAL DESCRIPTION OF THE TV SOUND OF SOUND PROCESSOR The TV Sound Processor is a digital TV sound processor for analog multi channel sound systems in TV sets It is based on a 24 bit DSP and designed to support several applications A new easy to use control concept was implemented for easiest configuration programmi...

Page 42: ...or BTSC full dbx performance n SAP demodulation without dbx simultaneously with stereo decoding or mono plus SAP with dbx n Line pilot frequency selectable from 15 734 kHz and 15 625 kHz or automatic detection auto search n High selectivity for pilot detection high robustness against high frequent audio components n Pilot lock indicator n SAP detector n Separate noise detectors for stereo and SAP ...

Page 43: ...Note1 D K 6 5 FM 27 50 80 5 85 J17 40 Note1 L 6 5 AM 54 100 5 85 J17 40 Note1 Note 1 See EBU specification or equivalent specification 5 4 FUNCTIONAL DESCRIPTION SOUND PROCESSOR 5 4 1 The UOC III TV Sound Concept The UOCIII sound concept is implemented over the video processor and TCG microcontroller Only relevant blocks functions and signal flows for sound are given The tuner receives a RF signal...

Page 44: ...DEMDEC a digital input crossbar the digital audio processing for the loudspeaker and DAC channels the I2S processing and interfacing a digital output crossbar as well as the DA conversion An auxiliary audio control volume control AUX audio contr is available on the video processor Here it is applied to the headphone channel The part of the concept located in the digital controller will be describe...

Page 45: ...o search for sound carriers and react to transmission mode changes autonomously without interaction of the micro controller software It is possible for a typical terrestrial TV application to setup the entire demodulator with transmission of few control words The control interface still allows access to every detail called demodulator expert mode for special applications such as satellite TV more ...

Page 46: ... A2 stereo dual and mono signals to obtain the left L and right R or language A and B signals FMPILOTCARRIERPRESENTDETECTOR The TV Sound Processor provides FM A2 standard pilot carrier detection NICAMDEMODULATION The NICAM signal is transmitted via DQPSK modulation at a bit rate of 728kBit s The NICAM demodulator performs DQPSK demodulation and feeds the resulting bit stream and clock signal to th...

Page 47: ...LOERRLIM and NICUPERRLIM When the number of errors in a 128 ms period exceeds the upper error limit the auto mute function will switch the output sound from NICAMtowhateversoundisonthefirstsoundcarrier FM or AM When the error count is smaller than the lower error limit the NICAM sound is restored The auto mute function can be disabled by setting bit NIC_AMUTE to 1 In this condition clicks become a...

Page 48: ...POWER STR W6754 I801A 4857024600 HEAT SINK AL EX B K I801B 7174300851 SCREW TAPPTITE TT2 RND 3X8 MFZN 3CR I802 1LTV817C IC PHOTO COUPLER LTV 817C I804 1LE33CZ IC REGULATOR LE33CZ IF01 1441VF6 IC PREAMP 441VF6 JPA01 4859200401 SOCKET RGB SR 21A1 ANGLE TYPE JPA02 4859200401 SOCKET RGB SR 21A1 ANGLE TYPE JPA03 4859108450 JACK PIN BOARD YSC03P 4120 14A L401 58H0000020 COIL H LINEARITY L 76 76 5UH LF80...

Page 49: ...817 CEXF1A471V C ELECTRO 10V RSS 470MF TAPPING C819 CEXF2C109V C ELECTRO 160V RSS 1MF 6 3 11 TP C820 CMXM2A104J C MYLAR 100V 0 1MF J TP C821 CEXF1C101V C ELECTRO 16V RSS 100MF 6 3X11 TP C824 CEXF1A471V C ELECTRO 10V RSS 470MF TAPPING C833 CEXF1C101V C ELECTRO 16V RSS 100MF 6 3X11 TP C834 CEXF1C101V C ELECTRO 16V RSS 100MF 6 3X11 TP C835 CEXF1C471V C ELECTRO 16V RSS 470MF 10X12 5 TP C904 CCXB3A271K...

Page 50: ...ODE ZENER TZX5V6B TAPPING DA06 DTZX5V6B DIODE ZENER TZX5V6B TAPPING DA08 DTZX5V6B DIODE ZENER TZX5V6B TAPPING DA09 DTZX5V6B DIODE ZENER TZX5V6B TAPPING DA10 DTZX5V6B DIODE ZENER TZX5V6B TAPPING DA11 DTZX5V6B DIODE ZENER TZX5V6B TAPPING DA13 DTZX5V6B DIODE ZENER TZX5V6B TAPPING DA14 DTZX5V6B DIODE ZENER TZX5V6B TAPPING DA15 DTZX5V6B DIODE ZENER TZX5V6B TAPPING DA16 DTZX5V6B DIODE ZENER TZX5V6B TAPP...

Page 51: ... COIL PEAKING 10UH 10 5MM K LAL04TB L515 5CPZ100K02 COIL PEAKING 10UH 3 5MM K LAL02TB L516 5CPZ479K02 COIL PEAKING 4 7UH 3 5MM K LAL02TB L523 5CPZ479K02 COIL PEAKING 4 7UH 3 5MM K LAL02TB L601 5CPZ100K02 COIL PEAKING 10UH 3 5MM K LAL02TB L602 5CPZ100K02 COIL PEAKING 10UH 3 5MM K LAL02TB L801 5MC0000100 COIL BEAD MD 5 HC 3550 R101 RD 2Z332J R CARBON FILM 1 2 3 3K OHM J R104 RD AZ101J R CARBON FILM ...

Page 52: ...1 6 1K OHM J R810 RC 2Z565KP R CARBON COMP 1 2 5 6M OHM K R811 RN 4Z9102F R METAL FILM 1 4 91 0K OHM F R812 RN 4Z1502F R METAL FILM 1 4 15K OHM F R813 RN 4Z2201F R METAL FILM 1 4 2 2K OHM F R814 RD AZ103J R CARBON FILM 1 6 10K OHM J R815 RD AZ102J R CARBON FILM 1 6 1K OHM J R816 RD 4Z399J R CARBON FILM 1 4 3 9 OHM J R817 RD AZ101J R CARBON FILM 1 6 100 OHM J R818 RD AZ103J R CARBON FILM 1 6 10K OH...

Page 53: ...CP 520V Service Manual 7 Exploded View 52 7 1 DTX 21G2 ...

Page 54: ...CP 520V Service Manual Exploded View 53 7 2 DTX 21B4 ...

Page 55: ...CP 520V Service Manual Exploded View 54 7 3 DTX 21U7 ...

Page 56: ...CP 520V Service Manual 8 Printed Circuit Board 55 8 1 4859813693 OLD PCB ...

Page 57: ...CP 520V Service Manual Printed Circuit Board 56 8 2 4859816393 NEW PCB ...

Page 58: ...CP 520V Service Manual 9 Schematic Diagram 57 ...

Page 59: ...DAEWOO ELECTRONICS CORP PRINTED DATE Dec 2006 686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA ...

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