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例5 机型:金星C56—402(日立NPSC机芯) 故障现象:接收彩色电视节目时,屏幕只呈现清晰的黑白图像,但无彩色。分析与检修:从现象看,故障出在彩色解码电路。为了快速判定故障部位,分别用万用表和示波器,对TA7193AP的几个关键点;如(21)脚(消色识别端)、⒇脚(色饱和控制端)、⒂脚(色度信号输入端)、⒀脚(色同步选通脉冲输入端)④脚(行逆程脉冲输入端)和⑧脚(4.43MHz副载波振荡)等进行测量和监视,并发现(21)
Example 5 Model: Venus C56-402 (Hitachi NPSC movement) Symptom: When receiving a color television program, the screen presents only clear black and white images, but no color. Analysis and Maintenance: From the phenomenon of view, the failure of the color decoding circuit. In order to quickly determine the fault site, respectively, with a multimeter and oscilloscope, TA7193AP a few key points; such as (21) feet (achromatic recognition), ⒇ feet (saturation control side), ⒂ feet , Feet (burst gate input) ④ feet (line back pulse input) and ⑧ feet (4.43MHz subcarrier oscillation), etc. were measured and monitored and found (21)