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[例1]索尼 KV-F29MH31型彩电,开机时有高压,随后高压消除,待机指示灯亮。分析与检修:开机后有高压产生的响声,说明在刚开机时行、场扫描电路工作正常,随后高压消失,说明电路中的故障造成保护电路动作而使待机指示灯点亮。用万用表测量电压的方法进行检修,首先在开机瞬间测量 IC001⑩脚电压,保持5V 左右,而“X射线”检测脚 IC001的(43)脚为5V 左右,从而使 IC001发出待机指令。让整机处在待机状态,即待机指示灯亮。通过电路分析,“X射线”检测脚电压来自 Q803 c极的电压,经 R860、R861分压得到的。经检查,发现
[Example 1] Sony KV-F29MH31-type color TV, high pressure when switched on, followed by elimination of high pressure, the standby indicator light. Analysis and Maintenance: There is a high-pressure sound after power-on, indicating that at the beginning of the line, field scanning circuit is working properly, followed by the disappearance of high voltage, indicating that the circuit fault caused by the protection circuit and the standby indicator light. Measure the voltage with the multimeter to carry on the overhaul, first measure the voltage of IC001⑩ foot at the moment of starting up, keep about 5V, and the foot of “X ray” test foot IC001 is about 5V, so that IC001 sends the standby instruction. Let the machine stand by, that is, the standby indicator light. Through the circuit analysis, “X-ray” test voltage from Q803 c pole voltage, the R860, R861 partial pressure obtained. After inspection, found