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例一故障现象:无光栅、无伴音。分析与检修:按常规检修法首先检查电源为115V,正常。其次检查行输出电路,测得行输出管Q_(302)集电极电压正常(115V).基极无负压,说明无行脉冲送入。再查行推动管Q_(301)集电极电压不正常(115V),基极无电压(正常为2.2V),表明该管无激励脉冲。该机行脉冲信号是由IC201(TA8659AN)第(39)脚提供的,查第(39)脚无电压,此时说明有两种情况:一是集成块没有供电电压;二是该集成块已损坏。根据图纸得
Example of a failure phenomenon: no grating, no sound. Analysis and Maintenance: According to the conventional inspection method first check the power supply is 115V, normal. Followed by the line output circuit, measured output tube Q_ (302) collector voltage is normal (115V). Base no negative pressure, indicating no pulse into. And then check the line to promote the tube Q_ (301) collector voltage is not normal (115V), base voltage (normal to 2.2V), indicating that the tube without excitation pulse. The machine line pulse signal is provided by IC201 (TA8659AN) pin (39), check the (39) feet no voltage, then there are two situations: First, there is no supply voltage manifold; second is the manifold has been damage. According to the drawings