Daewoo Dtf 2950 Service Manual
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CP-850FX Service Manual Europe R&D 30 4.4.1.2 DSP-Section (Audio Baseband Processing) ƒ flexible selection of audio sources to be processed ƒ performance of terrestrial de-emphasise systems (FM, NICAM) ƒ digitally performed FM-identification decoding and de-matrixing ƒ digital baseband processing: volume, bass, treble ƒ simple controlling of volume, bass, treble 4.4.1.3 Analogue Section ƒ two selectable analogue pairs of audio baseband input (= two SCART inputs) input level: 25 kΩ ƒ one selectable analogue mono input (i.e. AM sound): Not used in this chassis ƒ two high-quality A/D converters, S/N-Ratio: >85 dB ƒ 20 Hz to 20 kHz bandwidth for SCART-to-SCART copy facilities ƒ loudspeaker: one pair of four-fold oversampled D/A converters. Output level per channel: max. 1.4 VRMS output resistance: max. 5 kΩ. S/N-ratio: >85 dB at maximum volume max. noise voltage in mute mode: < 10 μV (BW: 20 Hz... 16 kHz) ƒ one pair of four-fold oversampled D/A converters supplying a pair of SCART-outputs. Output level per channel: max. 2 V RMS, output resistance: max. 0.5 kΩ, S/N-Ratio: >85 dB (20 Hz... 16 kHz) 4.4.1.4 NICAM & FM/AM-Mono According to the British, Scandinavian, Spanish, and French TV-standards, high-quality stereo sound is transmitted digitally. The systems allow two high-quality digital sound channels to be added to the already existing FM/AM-channel. The sound coding follows the format of the so- called Near Instantaneous Companding System (NICAM 728). Transmission is performed using Differential Quadrature Phase Shift Keying (DQPSK. Table below offers an overview of the modulation parameters. In the case of NICAM/FM (AM) mode, there are three different audio channels available: NICAM A, NICAM B, and FM/AM-mono. NICAM A and B may belong either to a stereo or to a dual language transmission. Information about operation mode and about the quality of the NICAM signal can be read by the controlling software via the control bus. In the case of low quality (high bit error rate), the controlling software may decide to switch to the analogue FM/AM-mono sound. Alternatively, an automatic NICAM-FM/AM switching may be applied. 4.4.1.5 German 2-Carrier System (DUAL FM System) Since September 1981, stereo and dual sound programs have been transmitted in Germany using the 2-carrier system. Sound transmission consists of the already existing first sound carrier and a second sound carrier additionally containing an identification signal. More details of this standard are given in Tables below. For D/K very similar system is used. TV standards TV system Position of sound carrier (MHz) Sound modulation Colour system Country B/G 5.5 / 5.7421875 FM Stereo PAL GERMANY B/G 5.5 / 5.85 FM-Mono / NICAM PAL Scandinavia, Spain L 6.5 / 5.85 AM – Mono / NICAM SECAM-L France
CP-850FX Service Manual Europe R&D 31 I 6.0 / 6.552 FM-Mono / NICAM PAL UK D/K 6.5 / 6.2578125 D/K1 6.5 / 6.7421875 D/K2 6.5 / 5.85 D/K-NICAM FM Stereo FM-Mono / NICAM SECAM- East USSR Hungary Architecture of MSP341x 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 Address select 7 STANDBYQ In Standby ( Low-active) 8 NC Not Connected 9 I2C_CL In / Out I2C Clock 10 I2C_DA In / Out I2C data 11 NC Not Connected 12 NC Not Connected 13 NC Not Connected 14 NC Not Connected 15 NC Not Connected 16 NC Not Connected 17 NC Not Connected 18 DVSUP Digital power supply +5V 19 DVSS Digital Ground 20 NC Not Connected 21 NC Not Connected 22 NC Not Connected
CP-850FX Service Manual Europe R&D 32 23 NC Not Connected 24 RESETQ In Power-On-reset 25 DACA_R Out Headphone out right 26 DACA_L Out Headphone out left 27 VREF2 Reference ground 2 high voltage part 28 DACM_R Out Loudspeaker out Right 29 DACM_L Out Loudspeaker out Left 30 NC Not Connected 31 NC Not Connected 32 NC Not Connected 33 SC2_OUT_R Out Scart output 2 right 34 SC2_OUT_L Out Scart output 2 left 35 VREF1 Reference ground 1 high voltage part 36 SC1_OUT_R Out Scart output 1, right 37 SC1_OUT_L Out Scart output 1, left 38 CAPL_A Volume capacitor 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 Not Connected 46 SC3_IN_L In Scart input 3 in, left 47 SC3_IN_R In Scart input 3 in, right 48 ASG2 Analog Shield Ground 2 49 SC2_IN_L In Scart input 2 in, left 50 SC2_IN_R In Scart input 2 in, right 51 ASG1 Analog Shield Ground 1 52 SC1_IN_L In Scart input 1 in, left 53 SC1_IN_R In Scart input 1 in, right 54 VREFTOP Reference voltage IF A/D converter 55 MONO_IN In Mono input 56 AVSS Analog ground 57 AVSUP Analog power supply 58 ANA_IN1+ In IF input 1 59 ANA_IN1- In IF common 60 NC Not Connected 61 TESTEN In Test pin 62 XTAL_IN In Crystal oscillator 63 XTAL_OUT Out Crystal oscillator 64 NC Test pin
CP-850FX Service Manual Europe R&D 33 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. 4.5.2 FEATURES - 5 V supply voltage; low power consumption. - Active carrier generation by FPLL principle (frequency-phase-locked-loop) for true synchronous demodulation. - Very linear video demodulation, good pulse response and excellent intermodulation figures. - VCO circuit operates at picture carrier frequency, the VCO frequency is switchable for L’-mode - Alignment-free AFC without external reference circuit, polarity of the AFC curve is switchable. - VIF-AGC for negative modulated signals (peak sync. detection) 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 output signal is gain controlled (necessary for digital sound processing). - Complete alignment-free AM demodulator with gain controlled AF output. - Separate SIF-AGC with average detection - Two independent SIF inputs - Parallel operation of the AM demodulator and QPS mixer (for NICAM-L stereo sound). 4.5.3 PINNING Pin Symbol Function 1, 2 Vi, SIF1 SIF1 input (symmetrical) 3 VSW Input selector switch 4, 9, 16 GND Ground 5 VAGC SIF – AGC (time constant) 6, 7 Vi, VIF VIF input (symmetrical) 8 CAGC VIF – AGC (time constant) 10 RTOP Take Over Point, tuner AGC 11 Itun Tuner AGC output current 12 VO, VID Video output 13 VSW Standard switch 14 VSW L’ switch 15 Cbl Black level capacitor 17 Cref Internal reference voltage 18 LF Loop Filter 19 VSW AFC switch 20, 21 VVCO VCO circuit 22 VAFC AFC output 23 VS Supply voltage 24 VO, FM Intercarrier output 25 VO, AM AF output – AM sound 26 Rcomp Offset compensation 27, 28 Vi, SIF2 SIF2 input (symmetrical)
CP-850FX Service Manual Europe R&D 34 4.5.4 BLOCK DIAGRAM
CP-850FX Service Manual Europe R&D 35 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. The TDA8946J comes in a 17-pin DIL-bent- SIL(DBS) power package. The TDA8946J is printed-circuit board compatibel with all other types in the TDA894x family. One PCB footprint accommodates both the mono and the stereo products. 4.6.1 FEATURES ƒ Few external components ƒ Fixed gain ƒ Standby and mute mode ƒ No on/off switching plops ƒ Low standby current ƒ High supply voltage ripple rejection ƒ Outputs short-circuit protected to ground, supply and across the load ƒ Thermally protected ƒ Printed-circuit board compatible Pin description Pin Symbol Description 1 OUT1- negative loudspeaker terminal 1 2 GND1 ground channel 1 3 Vcc1 supply voltage channel 1 4 OUT1+ positive loudspeaker terminal 1 5 n.c. not connected 6 IN1+ positive input1 7 n.c. not connected 8 IN1- negative input1 9 IN2- negative input2 10 MODE mode selection input 11 SVR half supply voltage decoupling (ripple rejection) 12 IN2+ positive input2
CP-850FX Service Manual Europe R&D 36 Block diagram TDA8946J
CP-850FX Service Manual Europe R&D 37 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. The full bridgeoutput circuit allows DC coupling of the deflection coil in combination with single positive supply voltages. The east-west output stage is able to supply the sink current for a diode modulator circuit. The IC is constructed in a Low Voltage DMOS(LVDMOS) process that combines Bipolar, CMOS and DMOS devices. MOS transistors are used in the output stage because of the absence of second breakdown. 4.7.1 FEATURES ƒ Few external components ƒ Highly efficiency fully DC-coupled vertical output bridge circuit ƒ Vertical flyback switch with short rise and fall times ƒ Built-in guard circuit ƒ Thermal protection circuit ƒ Improved EMC performance due to differential inputs ƒ East-West output stage
CP-850FX Service Manual Europe R&D 39 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. Features ƒ Typical bandwidth of 9.0 MHz for an output signal of 60 Vpp ƒ High slew rate of 1850V/μs ƒ No external components required ƒ Very simple application ƒ Single supply voltage of 200V ƒ Internal reference voltage of 2.5 V ƒ Fixed gain of 51. ƒ Black-current stabilisation (BCS) circuit ƒ Thermal protection Pin description Pin Symbol Description 1 Vi(1) inverting input 1 2 Vi(2) inverting input 2 3 Vi(3) inverting input 3 4 GND ground (fin) 5 Iom black current measurement output 6 VDD supply voltage 7 VOC(3) cathode output 3 8 VOC(2) cathode output 2 9 VOC(1) cathode output 1