Daewoo DTF-2950-100D Service Manual
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Daewoo DTF-2950-100D Service Manual

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Service Manual

CHASSIS : CP-850FX
MODEL : DTF-2950-100D
DTF-2950GB-100D
DTF-2950K-100D
Caution
: In this Manual, some parts can 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.TCP850XEF0
SEP.2006

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Summary of Contents for Daewoo DTF-2950-100D

  • Page 1: Service Manual

    S/M No.TCP850XEF0 Service Manual CHASSIS : CP-850FX MODEL : DTF-2950-100D DTF-2950GB-100D DTF-2950K-100D Caution : In this Manual, some parts can 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.

  • Page 2: Table Of Contents

    CP-850FX Service Manual CONTENTS DOCUMENT HISTORY .........................5 MAIN FEATURES........................6 1.1 SPECIFICATIONS ......................6 1.1.1 GENERAL........................6 1.1.2 EURO-SCART 1 (21 Pin) ....................6 1.1.3 EURO-SCART 2 (21 Pin) ....................7 1.2 CHANNEL/FREQUENCY TABLE ..................8 1.3 ATSS SORTING METHOD ....................11 1.3.1 GENERAL CASE......................11 1.3.2 SPECIAL CASE......................11 SAFETY INSTRUCTION ......................13 ALIGNMENT INSTRUCTIONS .....................14 3.1 MICROCONTROLLER CONFIGURATION : SERVICE MODE ........14...
  • Page 3 CP-850FX Service Manual 4.4.1.5 German 2-Carrier System (DUAL FM System)............30 ..33 TDA4470 - MULTISTANDARD VIDEO-IF AND QUASI PARALLEL SOUND PROCESSOR 4.5.1 DESCRIPTION ......................33 4.5.2 FEATURES........................33 4.5.3 PINNING........................33 4.5.4 BLOCK DIAGRAM.......................34 4.6 TDA8946J STEREO AUDIO AMPLIFIER .................35 4.6.1 FEATURES........................35 4.7 TDA8358J VERTICAL AMPLIFIER...................37 4.7.1 FEATURES........................37 4.8 TDA6108JF ........................39 4.9 24C16 - 16 KB EEPROM ....................40...
  • Page 4 CP-850FX Service Manual 5.4.2.4 Black Level Expander/Compressor (BLEC) ..............51 5.4.2.5 Luma Sharpness Enhancer (LSE) ................51 5.4.2.6 Dynamic Peaking......................51 5.4.2.7 Luma Transient Improvement (LTI) ................51 5.4.2.8 Mixing of Dynamic Peaking and LTI .................51 5.4.2.9 Chroma Transient Improvement ................51 5.4.2.10 Analog Back End ....................53 5.4.2.11 Analog RGB Insertion .....................53 5.4.2.12 CRT Measurement and Control ................53 5.4.2.13 Synchronization and Deflection ................54...
  • Page 5 CP-850FX Service Manual 5.10.2.4 Cancellation of OLP Circuit..................69 5.10.3 FB Terminal (Pin. 6)....................70 5.10.3.1 Constant Voltage Control Circuit................70 5.10.4 OCP/BD Terminal (Pin 7)...................71 8.4.1. Minus-Detection Type OCP Circuit ................71 5.10.5 Quasi-Resonant and Bottom-Skip Operation.............72 5.10. 5. 1 Quasi-Resonant Operation..................72 5.10.5.2 Bottom-Skip Operation (Switching from Quasi-Resonant Operation) .....73 1).

  • Page 6: Document History

    CP-850FX Service Manual DOCUMENT HISTORY VERSION DATE COMMENTS V1.00 31/07/06 Creation of document (Author JS KIM) for project CP-850FX 100Hz TV. Europe R&D Downloaded From TV-Manual.com Manuals...

  • Page 7: Main Features

    CP-850FX Service Manual MAIN FEATURES 1.1 SPECIFICATIONS 1.1.1 GENERAL TV standard PAL/SECAM-B/G, D/K, PAL-I/I, SECAM-L/L’ Colour system Tuner PAL, SECAM PAL, SECAM, PAL 60, NTSC M, NTSC 4.43 Sound system NICAM B/G, I, D/K, L, FM 2Carrier B/G, D/K Power 105W consumption Sound Output...

  • Page 8: Euro-Scart 2 (21 Pin)

    CP-850FX Service Manual N.C. Green Input 0.7 Vpp ± 0.1V, Impedance 75Ω N.C. Red Earth Blanking Earth Red Input 0.7 Vpp ± 0.1V, Impedance 75Ω Fast Switching 0 to 0.4V : Logic “0”, 1 to 3V : Logic “1”, Impedance 75Ω Video Out Earth Video In Earth Video Output...

  • Page 9: Channel/Frequency Table

    CP-850FX Service Manual 1.2 CHANNEL/FREQUENCY TABLE CHANNEL EUROPE CCIR FRANCE GB(IRELAND) EAST OIRT 46.25 45.75 49.75 48.25 55.75 (L') 53.75 59.25 55.25 60.5 (L') 61.75 77.25 62.25 63.75 (L') 175.25 85.25 175.25 176.00 183.25 93.25 182.25 184.00 191.25 175.25 189.25 192.00 199.25 183.25...
  • Page 10 CP-850FX Service Manual 679.25 679.25 679.25 679.25 687.25 687.25 687.25 687.25 695.25 695.25 695.25 695.25 703.25 703.25 703.25 703.25 711.25 711.25 711.25 711.25 719.25 719.25 719.25 719.25 727.25 727.25 727.25 727.25 735.25 735.25 735.25 735.25 743.25 743.25 743.25 743.25 751.25 751.25 751.25 751.25...
  • Page 11 CP-850FX Service Manual 287.25 160.00 303.25 287.25 294.25 294.25 303.25 303.25 303.25 311.25 311.25 311.25 311.25 319.25 319.25 319.25 319.25 327.25 327.25 327.25 327.25 335.25 335.25 335.25 335.25 343.25 343.25 343.25 343.25 351.25 351.25 351.25 351.25 359.25 359.25 359.25 359.25 367.25 367.25 367.25...

  • Page 12: Atss Sorting Method

    CP-850FX Service Manual 1.3 ATSS SORTING METHOD The TV set sweeps all the TV bands from beginning of VHF to end of UHF. The TV controlling software for each program checks if a VPS CNI code is transmitted (this system exists for German, Swiss and Austrian transmissions).
  • Page 13 CP-850FX Service Manual Note : If two programs with the same name but a different code are found these two programs are listed in group I, II or III . The sorting order within group II, III, and IV is based on the channel frequency. The program with the lowest frequency is allocated the first rank in its group, and so forth until the last program of the group which has the highest frequency.

  • Page 14: Safety Instruction

    CP-850FX Service Manual SAFETY INSTRUCTION WARNING: Only competent service personnel may carry out work involving the testing or repair of this equipment. X-RAY RADIATION PRECAUTION Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid such hazards, the high voltage must not exceed the specified limit. The nominal value of the high voltage of this receiver is 25-26 KV (20”-21”) or 26 KV (25”...

  • Page 15: Alignment Instructions

    CP-850FX Service Manual ALIGNMENT INSTRUCTIONS 3.1 MICROCONTROLLER CONFIGURATION : SERVICE MODE To switch the TV set into service mode please see instruction below. 1 - Select PR. number 91 2 - Adjust sharpness to minimum and exit all menus. 3 – Within 2 seconds press the key sequence : RED - GREEN - menu The software version is displayed beside the word Service, e.g.
  • Page 16 3.3.2 OPTION 2 Program PICTURE remote control list TILT ON Fixed to control enabled See table below ‘0’ Daewoo Program PICTURE Remote control list TILT OFF control disabled 3.3.3 OPTION 3 Local display Full keyboard : 6 “AV”...

  • Page 17: Tv Set Alignment

    CP-850FX Service Manual 3.4 TV SET ALIGNMENT 3.4.1 LOCAL OSCILLATOR ALIGNMENT Tune a colour bar pattern. The frequency of the signal carrier must be accurate ( Max +/- 10KHz deviation from the nominal channel frequency). Find “AFT” item in service mode. Adjust the coil L150 to bring the cursor to central position : 32.

  • Page 18: Agc

    CP-850FX Service Manual HOR WIDTH adjust for 93% overscan. PARABOLA CORNER B & CORNER T EW TRAPEZ 3.4.8 AGC - Make sure option bits are correct for the tuner fitted on the chassis (See above how to change option bits). - Adjust the antenna signal level at 62 dBμV±...

  • Page 19: Ic Description

    CP-850FX Service Manual IC DESCRIPTION 4.1 TELETEXT DECODER WITH EMBEDDED 8-BIT CONTROLLER TVText Pro is a 8-bit controller based on a enhanced 8051 core with embedded teletext, On screen Display and TV controller functions. 4.1.1 BLOCK DIAGRAM OF THE SDA55XX 4.1.2 DESCRIPTION The SDA 55xx is a single chip teletext decoder for decoding World System Teletext data as well as Video Programming System (VPS), Program Delivery Control (PDC), and Wide Screen...

  • Page 20: Ic Marking And Version

    CP-850FX Service Manual interface and receives/transmits data via I 2 C-firmware user-interface. The slicer combined with dedicated hardware stores TTX data in a VBI buffer of 1 Kilobyte. The Microcontroller firmware performs all the acquisition tasks (hamming-and parity-checks, page search and evaluation of header control bits) once per field.
  • Page 21 CP-850FX Service Manual Remote control signal input Interrupt input from audio processor n.c. n.c. n.c. n.c. Ground (0V) VDD3.3 Input/Output 3.3V n.c. n.c. RESET A low level on this pin resets the device. XTAL2 Output of the inverting oscillator amplifier XTAL1 Input of the inverting oscillator amplifier VSSA...

  • Page 22: Vsp94X5B (Version C4)- Optimus Color Decoder And Scan-Rate Converter

    CP-850FX Service Manual 4.2 VSP94x5B (version C4)– OPTIMUS Color Decoder and Scan-Rate Converter The VSPB family supports 15/32kHz systems and is available with different options. VSP 94x5B has one channel only. 4.2.1 BLOCK DIAGRAM OF THE VSP94x5B Europe R&D Downloaded From TV-Manual.com Manuals...

  • Page 23: Feature Overview

    CP-850FX Service Manual 4.2.2 Feature Overview Different application modes FSM : Frame based high performance master with PIP SSC : Split screen ("Double Window") Data acquisition connectivity Up to seven (VSP 9425B/9427B: nine) CVBS inputs, up to two Y/C inputs Up to three CVBS outputs (even when Y/C input) ITU-R 656 compatible digital input RGB/FBL or YUV or YUV-H-V input...

  • Page 24: Pinning

    CP-850FX Service Manual 2D and 3D frames for master and slave channel Vertical chrominance shift for improved VCR picture quality Contrast, brightness and saturation control Sharpness improvement Digital color transition improvement (DCTI) Adaptive horizontal and vertical peaking (luminance) Digital luminance transition improvement (DLTI) Digital contrast improvement (DCI, master channel only) Three D/A converters 9 bit amplitude resolution for YUV, RGB output...
  • Page 25 CP-850FX Service Manual VSSD4 Supply voltage for digital (0 V digital) VDDD4 Supply voltage for digital 1.8 V digital VDDAFBL Supply voltage for FBL (1.8 V) VSSAFBL Supply voltage for FBL (0 V) FBL1 Fast Blank input 1 (H1) (Analog input) FBL2 Fast Blank input 2 (H2) (Analog input) RIN1...

  • Page 26: Ddp 3315C - Display And Deflection Processor

    CP-850FX Service Manual 4.3 DDP 3315C – DISPLAY AND DEFLECTION PROCESSOR The DDP 3315C is a mixed-signal single-chip digital display and deflection processor, designed for high-quality backend applications in double scan and HDTV TV sets with 4:3 or 16:9 picture tubes.
  • Page 27 CP-850FX Service Manual – horizontal frequency for VGA/SVGA/1080I – black switch off procedure – supports horizontal and vertical dynamic focus Miscellaneous – selectable ITU-R 601 4:1:1 / 4:2:2 YC r C b input at 27/32 MHz or double scan ITU-R 656 input at 54 MHz line-locked clock –...

  • Page 28: Pinning

    CP-850FX Service Manual 4.3.3 PINNING Pin No. Pin Name Description Remarks Picture bus Luma Picture bus Luma (MSB) 656EN Enable 656 input mode LLC2 System clock input Horizontal Sync Input Vertical Sync Input FREQSEL Selection of H-Drive Frequency Range Clock select 1 Clock select 0 Additionnal VSYNC input XTAL2...
  • Page 29 CP-850FX Service Manual VRD/BCS DAC Reference, Beam current safety AGND Analog Ground for Analog Matrix FBLIN1 Fast Blank1input RIN1 Analog Red1input GIN1 Analog Green1 input BIN1 Analog Blue1input FBLIN2 Fast Blank2 input RIN2 / P Analog Red2 input / P Input GIN2 / Y Analog Green2 input / Y Input...

  • Page 30: Msp341X Multistandard Sound Processor

    CP-850FX Service Manual 4.4 MSP341X MULTISTANDARD SOUND PROCESSOR The MSP 341x is designed as a single-chip Multistandard Sound Processor for applications in analogue and digital TV sets, video recorders, and PC cards. The MSP3411 has all functions of MSP3410 with the addition of a virtual surround sound features.

  • Page 31: Dsp-Section (Audio Baseband Processing)

    CP-850FX Service Manual 4.4.1.2 DSP-Section (Audio Baseband Processing) flexible selection of audio sources to be processed performance of terrestrial de-emphasise systems (FM, NICAM) digitally performed FM-identification decoding and de-matrixing digital baseband processing: volume, bass, treble simple controlling of volume, bass, treble 4.4.1.3 Analogue Section two selectable analogue pairs of audio baseband input (= two SCART inputs) input level: <2 V RMS, input impedance: >25 kΩ...
  • Page 32 CP-850FX Service Manual 6.0 / 6.552 FM-Mono / NICAM 6.5 / 6.2578125 D/K1 FM Stereo USSR SECAM- 6.5 / 6.7421875 D/K2 FM-Mono / NICAM Hungary East 6.5 / 5.85 D/K-NICAM Architecture of MSP341x Pin connections and short description Pin No. Pin Name Type Short description...
  • Page 33 CP-850FX Service Manual Not Connected RESETQ Power-On-reset DACA_R Headphone out right DACA_L Headphone out left VREF2 Reference ground 2 high voltage part DACM_R Loudspeaker out Right DACM_L Loudspeaker out Left Not Connected Not Connected Not Connected SC2_OUT_R Scart output 2 right SC2_OUT_L Scart output 2 left VREF1...

  • Page 34: Tda4470 - Multistandard Video-If And Quasi Parallel Sound Processor

    CP-850FX Service Manual 4.5 TDA4470 - MULTISTANDARD VIDEO-IF AND QUASI PARALLEL SOUND PROCESSOR 4.5.1 DESCRIPTION The TDA4470 is an integrated bipolar circuit for multi-standard video/sound IF (VIF/SIF) signal processing in TV/VCR and multimedia applications. The circuit processes all TV video IF signals with negative modulation (e.g., B/G standard), positive modulation (e.g., L standard) and the AM, FM/NICAM sound IF signals.

  • Page 35: Block Diagram

    CP-850FX Service Manual 4.5.4 BLOCK DIAGRAM Europe R&D Downloaded From TV-Manual.com Manuals...

  • Page 36: Tda8946J Stereo Audio Amplifier

    CP-850FX Service Manual 4.6 TDA8946J STEREO AUDIO AMPLIFIER The TDA 8946J is a dual-channel audio power amplifier with an output power of 2 x 15 W at an 8 Ω load and a 18 V supply. The circuit contains two Bridge Tied Load (BTL) amplifiers with an all-NPN output stage and standby/mute logic.
  • Page 37 CP-850FX Service Manual Block diagram TDA8946J Europe R&D Downloaded From TV-Manual.com Manuals...

  • Page 38: Tda8358J Vertical Amplifier

    CP-850FX Service Manual 4.7 TDA8358J VERTICAL AMPLIFIER The TDA8358J are power circuit for use in 90° and 110° colour deflection systems for field frequencies of 25 to 200Hz field frequencies, and for 4:3 and 16:9 picture tubes. The IC contains a vertical diflection output circuit, operating as a high efficiency class G system.
  • Page 39 CP-850FX Service Manual Europe R&D Downloaded From TV-Manual.com Manuals...

  • Page 40: Tda6108Jf

    CP-850FX Service Manual 4.8 TDA6108JF The TDA6108JF includes three video output amplifiers in one plastic DIL-Bent-SIL 9-pin medium power(DBS9MPF) package(SOT111-1), using high voltage DMOS technology, and is intended to drive the three cathodes of a colour CRT directly. To obtain maximum performance, the amplifier should be used with black-current control.

  • Page 41: 24C16 - 16 Kb Eeprom

    CP-850FX Service Manual Block diagram TDA6108JF 4.9 24C16 - 16 KB EEPROM Features : 16 Kbit serial I2C bus EEPROM Single supply voltage : 4.5 V to 5.5 V 1 Million Erase/Write cycles (minimum) 40 year data retention (minimum) Pin description Pin No.

  • Page 42: Str - W6754

    CP-850FX Service Manual 4.10 STR – W6754 4.10.1 GENERAL DESCRIPTION The STR-W6700 series is a Hybrid IC (HIC) designed for Quasi-Resonant type Switching Mold Power Supply built-in a Power MOSFET and Control IC. 4.10.2 FEATURES operation mode turns blocking oscillation by reducing output voltage at stand-by mode. In addition to the existing Quasi-Resonant Operation, the Bottom-Skip Function is added in order to be efficient from light to medium load.

  • Page 43: Pin Description

    CP-850FX Service Manual 4.10.4 PIN DESCRIPTION Terminal Pin No. Symbols Functions Descriptions Drain Terminal MOSFET Drain Source/Grand MOSFET Source and － Terminal Ground S/GND Control Circuit Power Supply Power Supply Terminal Input Overload Protection and Delay at Overload/Soft- SS/OLP Soft- Start Operation Time Start set up Terminal set up Constant Voltage Control...

  • Page 44: Electrical Characteristics

    CP-850FX Service Manual 4.10.6 ELECTRICAL CHARACTERISTICS Ratings Parameters Terminal Symbols Units T Y P M A X ower Supply Start-up Operation Operation Start-up Voltage 4 - 3 VCC(ON) 18.2 Operation Stop Voltage 4 - 3 VCC(OFF) Operation Circuit Current 4 - 3 ICC(ON) ―...

  • Page 45: Cp-850Fx Chassis Description

    CP-850FX Service Manual CP-850FX CHASSIS DESCRIPTION 5.1 POWER SUPPLY BLOCK DIAGRAM Europe R&D Downloaded From TV-Manual.com Manuals...

  • Page 46: Video & Stereo Audio Block Diagram

    CP-850FX Service Manual 5.2 VIDEO & STEREO AUDIO BLOCK DIAGRAM Europe R&D Downloaded From TV-Manual.com Manuals...

  • Page 47: If Section

    CP-850FX Service Manual 5.3 IF SECTION 5.3.1 BLOCK DIAGRAM Europe R&D Downloaded From TV-Manual.com Manuals...

  • Page 48: Vision If Amplifier

    CP-850FX Service Manual 5.3.2 VISION IF AMPLIFIER The video IF signal (VIF) is fed through a SAW filter to the differential input (Pin 6-7) of the VIF amplifier. This amplifier consists of three AC-coupled amplifier stages. Each differential amplifier is gain controlled by the automatic gain control (VIF-AGC). The output signal of the VIF amplifier is applied to the FPLL carrier generation and the video demodulator.

  • Page 49: Video Demodulation And Amplifier

    CP-850FX Service Manual 5.3.5 VIDEO DEMODULATION AND AMPLIFIER The video IF signal, which is applied from the gain controlled IF amplifier, is multiplied with the inphase component of the VCO signal. The video demodulator is designed for low distortion and large bandwidth.

  • Page 50: Input Selector

    CP-850FX Service Manual and SECAM operation a baseband delay line is used for U and V signals. This can be used as comb filter in NTSC operation (only for chrominance). The RGB input from SCART is used as an overlay for the CVBS channel (RGB+FBL). This block contains a matrix (for RGB signals).

  • Page 51: Noise Reduction

    CP-850FX Service Manual pixels by subsampling. To prevent the introduction of alias distortion low pass filters are used for luminance and chrominance processing. The horizontal prescaler consists of two main subsampling stages. The first stage is a scaler for rational decimation factors in a range of 1 to 2. The second stage decimates in integer steps (1,2,3,4...32).

  • Page 52: Luma Contrast And Brightness

    CP-850FX Service Manual 5.4.2.3 Luma Contrast and Brightness The luminance signal is multiplied by a factor of 0...2 (contrast adjustment). The signal can be shifted by ±100% of its maximal amplitude with the digital brightness value 5.4.2.4 Black Level Expander/Compressor (BLEC) The black level expander/compressor modifies the luminance signal with an adjustable non- linear function to enhance the contrast of the picture.
  • Page 53 CP-850FX Service Manual by over and undershoots at the chroma transition, the sharpened chroma signals are limited to a proper value automatically a) Cr Cb input of CTI b) Cr Cb input + correction signal c) sharpened and limited Cr Cb Europe R&D Downloaded From TV-Manual.com Manuals...

  • Page 54: Analog Back End

    CP-850FX Service Manual 5.4.2.10 Analog Back End The digital RGB signals are converted to analogue RGB by three 10-bit digital to analogue converters (DAC). Each RGB signal has two additional DACs with 9-bit resolution to adjust analogue brightness (40% of the full RGB range) and cutoff / black level (60% of the full RGB range).

  • Page 55: Synchronization And Deflection

    CP-850FX Service Manual pass filtered with the according gain and time constant. The result is used to attenuate the RGB outputs by adjusting the white drive multipliers for the internal (digital) RGB signals, and the analog contrast multipliers for the analog RGB inputs, respectively. The lower limit of the attenuator is programmable, thus a minimum contrast can always be set.

  • Page 56: Ports

    CP-850FX Service Manual Attenuation Measurement and Compensation Group Delay Measurement and Compensation Exact Decoding of Echo Disturbed Signals 5.5.3 PORTS One 8-bit I/O-port with open drain output and optional I 2 C Bus emulation support (Port 0) Two 8-bit multifunction I/O-ports (Port 1, Port 3) One 4-bit port working as digital or analogue inputs for the ADC (Port 2) One 2-bit I/O-port with secondary functions (P4.2, 4.3, 4.7) 5.5.4 μ-CONTROLLER I/O PIN CONFIGURATION AND FUNCTION TABLE...

  • Page 57: Automatic Picture Format Switching

    CP-850FX Service Manual 5.5.6 AUTOMATIC PICTURE FORMAT SWITCHING When AUTO mode is selected by the user, the television will automatically select the picture format for the user. If the user does not want to accept this selected format, he can always override the setting by use of the ZOOM control on the remote control.

  • Page 58: Scart Pin 8 Data (Slow Switching)

    CP-850FX Service Manual 5.5.6.2 SCART Pin 8 Data (Slow Switching) When there is a signal from SCART 1 pin 8 or SCART 2 pin 8 (named the Slow Switching SSW signal) the TV will enter AV mode, unless the user forces another source (which is possible even though slow switching is present).

  • Page 59: 4:3 Crt

    CP-850FX Service Manual Picture is displayed filling Standard 16/9 FULL SCREEN 100% 100% the full screen (width and picture with 576 height) active lines Picture is displayed filling Used to fit a picture the full screen (width and with 4:3 format on a PANORAMA height) by incorporating a 16:9 screen by...

  • Page 60: External Source Control Logic

    CP-850FX Service Manual 5.5.7 EXTERNAL SOURCE CONTROL LOGIC 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 the SCART SLOW SWITCHING pin has gone to a high state, and the AV 1 input is selected without the intervention of the user.

  • Page 61: Over Current Protection

    CP-850FX Service Manual 5.5.8 OVER CURRENT PROTECTION In case of overload, the SMPS secondary voltages will drop. The voltage on pin 5 of microcontroller changes Low to High. The controlling software which continuously monitors this voltage will switch the set to stand by mode. To power on the set again the user must switch it off using the main power switch.

  • Page 62: Sound Processing

    CP-850FX Service Manual C12 C13 C14 PRIMARY OSD Language Secondary Language X26 Language LANGUAGE English, French, English English West Euro German, Italian, German German West Euro Spanish, Dutch, Scandinavian Scandinavian West Euro Danish, Finnish, Italian Italian West Euro Norwegian, French French West Euro Swedish, Greek...

  • Page 63: Nicam Decoder

    CP-850FX Service Manual 5.7.4 NICAM DECODER In case of NICAM - mode, the phase samples are decoded according the DQPSK - coding scheme. The output of this block contains the original NICAM bitstream. 5.7.5 DSP SECTION All audio baseband functions are performed by digital signal processing (DSP). The DSP section controls the source and output selection, and the signals processing.

  • Page 64: Mode Selection

    CP-850FX Service Manual 5.8.2 MODE SELECTION The TDA8946J 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 coupling capacitors to be charged to avoid pop-noise.

  • Page 65: Power Supply (Str-W6754) - Functions Of Each Terminal

    CP-850FX Service Manual 5.10 POWER SUPPLY (STR-W6754) Functions of Each Terminal 5.10.1 Vcc Terminal (Pin 4) 5.10.1.1 Start-up Circuit The start-up circuit detects Vcc terminal (No.4 pin) voltage, and makes a control IC start and stop. The power supply of the control IC (Vcc terminal input) employs a circuit as shown in Fig.1.

  • Page 66: Auxiliary/Drive Winding

    CP-850FX Service Manual 5.10.1.2 Auxiliary/Drive Winding Control Circuit Operation Start After the control circuit starts its operation, the power 制御回路動作開始 supply is gained by rectifying and smoothing the 18 .2V Aux. Winding Vol. voltage of the auxiliary winding D. (TYP ) 補助巻線電圧...

  • Page 67: Overvoltage Protection Circuit

    CP-850FX Service Manual 5.10.1.3 Overvoltage Protection Circuit Where the voltage exceeding 27.5V(TYP) is imposed on between Vcc and GND terminals, the OVP circuit of the control IC starts its operation and turns latch-mode, and the control IC stops its oscillation. Generally, the Vcc terminal voltage is supplied from the auxiliary winding of the transformer, and the voltage is in proportion to the output voltage;...

  • Page 68: Latch Circuit

    CP-850FX Service Manual 5.10.1.4 Latch Circuit The latch circuit is a circuit that holds the oscillator output low and stops the power supply circuit operation when OVP or OLP circuit operates. The holding current of the latch circuit is 150µA MAX (Ta = 25C) when the Vcc terminal voltage is minus 0.3V to the operation stop.

  • Page 69: Overload Protection

    CP-850FX Service Manual 5.10.2.2 Overload Protection The output characteristics of the secondary side at the time 出力電圧 Vout Vou t when the OCP circuit operates, due to the overload of the secondary side output, is shown in Fig.8. Where the output voltage falls below the overload mode, the auxiliary winding AC High A C 高...

  • Page 70: Operation At Power Supply Off

    CP-850FX Service Manual The time until the latch protection operation starts its operation can be calculated from the following formula since the I is a constant current circuit. That is, SSOLP(OLP) C (Condenser Capacity) x ⊿V(Condenser Charging Voltage: approx. 5V) = I x t (time) SSOLP (OLP) ……...

  • Page 71: Fb Terminal (Pin. 6)

    CP-850FX Service Manual 5.10.3 FB Terminal (Pin. 6) The operation of FB terminal is divided into normal (constant voltage control circuit operation) and stand-by operation control. Refer to item No. 8.6 for the controlling at stand-by operation. 5.10.3.1 Constant Voltage Control Circuit The STR-W6700 series adopts the current mode controlling circuit for the constant voltage control, which proves its superiority in a heavy load.

  • Page 72: Ocp/Bd Terminal (Pin 7)

    CP-850FX Service Manual 5.10.4 OCP/BD Terminal (Pin 7) The functions of OCP/BD terminal are categorized as Overcurrent Protection (OCP), Bottom- Skip, and Quasi-Resonant Operation control. Refer to item No. 8.5 for Bottom-Skip and Quasi- Resonant operation. 8.4.1. Minus-Detection Type OCP Circuit The OCP of the STR-W6700 series is pulse-by-pulse type Overcurrent protection circuit, which detects the peak value of the MOSFET drain current per pulse and...

  • Page 73: Quasi-Resonant And Bottom-Skip Operation

    CP-850FX Service Manual 5.10.5 Quasi-Resonant and Bottom-Skip Operation 5.10.5.1 Quasi-Resonant Operation The Quasi-Resonant operation is to match the timing of the MOSFET Turn-ON to the bottom point of the voltage resonant waveform after a transformer releases the energy (i.e., 1/2 cycle of the resonant-frequency). As shown in Fig.15, the voltage resonant condenser C4 is connected between the drain and source, and the delay circuit, C10, D3, D4, and R9 are connected...

  • Page 74: Bottom-Skip Operation (Switching From Quasi-Resonant Operation)

    CP-850FX Service Manual 5.10.5.2 Bottom-Skip Operation (Switching from Quasi-Resonant Operation) The basic bottom-skip operation is that the load of the secondary side is detected by the drain current value (actually OCP/BD terminal voltage), which switches to the Quasi-Resonant (at heavy load) and the Bottom-Skip operation (at light load). The timing of distinguishing is made by taking the OCP/BD terminal voltage in at start-down of the MOSFET gate voltage of the HIC.

  • Page 75: Stand-By Operation

    CP-850FX Service Manual rating, and the standard voltage is automatically changed to VOCPBD(BS2). Besides, the VOCP is OCP/BD terminal voltage at that time when the MOSFET gate voltage starts down. As described above, the standard voltage (VOCPBD(BS1), VOCPBD(BS2)) realizing the Bottom- Skip operation provides the hysteresis operation automatically and makes it possible to have the stabilized operation.
  • Page 76 CP-850FX Service Manual continues falling because the HIC’s oscillation is suspended until the Vcc terminal voltage (Pin 4) reaches the operation start-up voltage 18V (TYP). Thus it is required to secure the voltage exceeding the required output voltage of secondary side. Secondary Output Voltage Stand-by...

  • Page 77: Step-Drive Circuit

    CP-850FX Service Manual At the stand-by mode, as mentioned above, due to the burst-mode of the HIC’s intermittent operation, the output voltage falls since the HIC stops its operation during the oscillation stop period. While, during the stand-by operation, the intermittent operation repeating oscillation and stop through the start-up resistor is provided because the transformer’s auxiliary winding voltage supplying the power supply to the HIC is extremely decreased.

  • Page 78: Service Parts List

    4856716000 SPRING 14Q1/M3 SWPA PIE0.5 Z601 5PXF1B471M FILTER EMI CFI 06 B 1H 470PF M561 48556293SD02 MARK BRAND “DAEWOO 25””29””32”” NEW” Z602 5PXF1B471M FILTER EMI CFI 06 B 1H 470PF Z603 5PXF1B471M FILTER EMI CFI 06 B 1H 470PF PWC1...
  • Page 79 CP-850/F Service Manual PART CODE PART NAME DESCRIPTION REMARK PART CODE PART NAME DESCRIPTION REMARK C604 CEXF1E102V C ELECTRO 25V RSS 1000MF (13X20) TP R801 DJ5020M270 POSISTOR J502P72D070M270 C805 CEYD2G181D C ELECTRO 400V FHS 180MF R803 RS02Y338JS R M-OXIDE FILM 2W 0.33 OHM J SMALL C812 CH1BFE472M...
  • Page 80 CP-850/F Service Manual PART CODE PART NAME DESCRIPTION REMARK PART CODE PART NAME DESCRIPTION REMARK 4856310300 EYE LET BSR T0.2 (R1.6) SMALL CC569 HCBK102KBA C CHIP CERA 50V X7R 1000PF K 1608 4856310600 EYE LET BSR 2.3(R2.3) BIG CC570 HCBK104KBA C CHIP CERA 50V X7R 0.1MF K 1608 4856310300...
  • Page 81 CP-850/F Service Manual PART CODE PART NAME DESCRIPTION REMARK PART CODE PART NAME DESCRIPTION REMARK RC580 HRFT821JBA R CHIP 1/10 820 OHM J 1608 C524 CEXF1E470V C ELECTRO 25V RSS 47MF (5X11) TP RC581 HRFT102JBA R CHIP 1/10 1K OHM J 1608 C530 CEXF1E100V C ELECTRO...
  • Page 82 CP-850/F Service Manual PART CODE PART NAME DESCRIPTION REMARK PART CODE PART NAME DESCRIPTION REMARK L802 58CX430599 COIL CHOKE AZ-9004Y 940K TP C553 CCZB1H103K C CERA 50V B 0.01MF K (AXIAL) Q103 T2SC5343Y- 2SC5343Y C557 CBZF1H104Z C CERA SEMI 50V F 0.1MF Z (AXIAL) Q104 T2SC5343Y- 2SC5343Y...
  • Page 83 CP-850/F Service Manual PART CODE PART NAME DESCRIPTION REMARK PART CODE PART NAME DESCRIPTION REMARK J234 85801060GY WIRE COPPER 1/0.6 TIN COATING J380 85801060GY WIRE COPPER 1/0.6 TIN COATING J235 85801060GY WIRE COPPER 1/0.6 TIN COATING J381 85801060GY WIRE COPPER 1/0.6 TIN COATING J236 85801060GY...
  • Page 84 CP-850/F Service Manual PART CODE PART NAME DESCRIPTION REMARK PART CODE PART NAME DESCRIPTION REMARK 85801060GY WIRE COPPER 1/0.6 TIN COATING R519 RD-AZ750J- R CARBON FILM 1/6 75 OHM J L105 5CPZ479K02 COIL PEAKING 4.7UH 3.5MM K (LAL02TB) R520 RD-AZ750J- R CARBON FILM 1/6 75 OHM J L153...
  • Page 85 CP-850FX Service Manual PART CODE PART NAME DESCRIPTION REMARK PART CODE PART NAME DESCRIPTION REMARK R903 RD-AZ101J- R CARBON FILM 1/6 100 OHM J R811 RC-2Z565KP R CARBON COMP 1/2 5.6M OHM K R911 RD-AZ101J- R CARBON FILM 1/6 100 OHM J R817 RD-AZ473J- R CARBON FILM...

  • Page 86: Exploded View

    CP-850FX Service Manual 7. EXPLODED VIEW Europe R&D Downloaded From TV-Manual.com Manuals...

  • Page 87: Printed Circuit Board

    CP-850FX Service Manual 8. PRINTED CIRCULT BOARD 8.1 MAIN PCB Europe R&D Downloaded From TV-Manual.com Manuals...

  • Page 88: Union Pcb

    CP-850FX Service Manual PRINTED CIRCULT BOARD 8.2 UNION PCB Europe R&D Downloaded From TV-Manual.com Manuals...

  • Page 89: Crt Pcb

    CP-850FX Service Manual PRINTED CIRCULT BOARD 8.3 CRT PCB Europe R&D Downloaded From TV-Manual.com Manuals...

  • Page 90: Schematic Diagram

    CP-850FX Service Manual 9. SCHEMATIC DIAGRAM 9.1 MAIN Europe R&D Downloaded From TV-Manual.com Manuals...

  • Page 91: Union & Crt

    CP-850FX Service Manual 9.2 UNION & CRT Europe R&D Downloaded From TV-Manual.com Manuals...
  • Page 92 DAEWOO ELECTRONICS CORP. 686, AHYEON-DONG, MAPO-GU, SEOUL, KOREA. C.P.O. BOX 8003 SEOUL KOREA PRINTED DATE : SEP. 2006 Downloaded From TV-Manual.com Manuals...

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