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例1 开机后呈“三无”分析与检修:根据现象分析,说明故障出在电源电路或行扫描电路。打开后盖,测电源输出端电压为12V(正常),说明电源电路无故障。断定故障出在行扫描电路,测行输出管集电极电压为12V(正常值为27V),说明不是行振荡电路不正常,就是行推动电路有故障。测集成块TDA4500第(27)脚电压为2.5V(正常值为7.8V),第(23)脚电压为2.3V(正常为3V),说明行振荡
Example 1 boot showed “three no” Analysis and Maintenance: According to the phenomenon analysis shows that the fault lies in the power circuit or the line scan circuit. Open the back cover, measuring the power output voltage is 12V (normal), indicating that the power circuit is faultless. Determine the fault line scan circuit, the output voltage measurement tube collector voltage is 12V (normal value is 27V), indicating that the line is not normal oscillation circuit is the line to promote the circuit fault. Test block TDA4500 feet (27) voltage of 2.5V (normal value of 7.8V), the first 23 feet voltage of 2.3V (normal 3V), indicating the line oscillation