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2)采用“示波器”法(监测与色有关引脚信号波形):这是快速检查判断故障部位的有效方法。例如:重点监视M513939AP⑥、⑦脚副载波波形(正弦波);①脚上的色同步信号;④、⑤脚上的7.8 kHz半行频电压;⒆、⒇、(21)脚上相应的色差信号波形等等(有关波形参阅10期图35)观察波形时,要注意各波形的特征及有无信号时波形的变化情况 3)采用可调元件调整法:日立NP82C机芯彩电解码器(M51393AP)中与彩色有关可调元件有:R519色饱和度调节电位器;梳状滤波器中T502磁芯和电位器R505;副载波压控振荡器中的电容C519等。例如,C519电容参数发生变化而副载波振荡频率相应地产生偏差(偏差允许范围为4.433618 MHz±300Hz),如
2) The use of “oscilloscope” method (monitoring and color-related pin signal waveform): This is a quick check to determine the fault location effective method. For example: focus monitoring M513939AP ⑥, ⑦ foot sub-carrier waveforms (sine wave); ① color burst signal on the feet; ④, ⑤ 7.8 kHz half line frequency voltage on the foot; ⒆, ⒇, (21) Waveform, etc. (See Figure 10 for the waveforms in Figure 35) Observing waveforms, pay attention to the characteristics of the waveforms and the presence or absence of changes in the waveform signal 3) Adjustable element adjustment method: Hitachi NP82C movement color TV decoder (M51393AP) In color and adjustable components are: R519 color saturation adjustment potentiometer; comb filter T502 core and potentiometer R505; subcarrier voltage-controlled oscillator in the capacitor C519 and so on. For example, C519 capacitance parameter changes and subcarrier oscillation frequency corresponding deviation (deviation allowable range of 4.433618 MHz ± 300Hz), such as