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新型彩色电视机中,大都采用了各种保护电路,这些保护电路无疑对彩电中许多重要元器件起到了保护作用,但是对分析电路及维修带来许多麻烦。要解决好这个问题,只有充分了解各保护电路的工作原理,分析电路所出现问题的原因,上述问题就不难解决了。下面就虹美C-5403型彩电中,电源、伴音、行场扫描电路中的保护电路进行分析。该机电源部分采用的是IX0512CE厚膜集成块。该保护电路是由D_(712),D_(713),C_(714),R_(785),R_(711),R_(721)组成,其电路见图1。
The new color television set, most of the use of a variety of protective circuits, these protective circuits undoubtedly many important components in the TV play a protective effect, but the analysis of the circuit and maintenance of a lot of trouble. To solve this problem, only fully understand the working principle of the protection circuit, the circuit analysis of the reasons for the problems, the above problems are not difficult to solve. Below Hong Mei C-5403 color TV, power, sound, line scan circuit protection circuit analysis. Part of the power used in this machine is IX0512CE thick film manifold. The protection circuit is composed of D 712, D 713, C 714, R 785, R 711 and R 721, and the circuit is shown in FIG. 1.