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例l故障现象:光栅呈现水平一条亮线。分析检修:测量场输出集成块IC弱,(”Pcl378)⑥图1脚无24v工作电压,见图1所示,检查其供电回路发现二极管D_(855)击穿短路,保险电阻R_(854)已烧断。将D_(855)和R_(854)换新后,光栅恢复正常。此故障是因二极管D_(855)击穿短路引起电流过大而烧断保险电阻R_(854)所致。例2 故障现象:有正常的黑白图像和伴音,但是无彩色。分析检修:测量亮度与色度处理集成块IC_(301)
Example l failure phenomenon: the grating presents a bright line. Analysis and repair: IC output field weakness, (Pcl378) ⑥ Figure 1 feet without 24v operating voltage, shown in Figure 1, check the power supply circuit to find the diode D_ (855) breakdown short circuit, the fuse R_ (854) (855) and R_ (854) is renewed, the grating is restored to normal.This fault is caused by the blowout of the fuse R_ (854) caused by the excessive current caused by the breakdown of the diode D_ (855). Example 2 Symptoms: Normal black-and-white images and sound, but no color. Analytical Overhaul: Measuring Luminance and Chrominance Processing ICs (301)