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例1:康佳T920A型彩电,图像正常,伴音失去控制。检查微处理器MN15245发现内部伴音控制电路损坏,其第(34)脚电平信号失控,开关管T_(201)的导通或截止状态也失去控制从而无法改变TA7680第①脚电压,电子音量控制器不能正常工作。应急修理可将电子控制改为人工手动调节,具体方法为:将开关管T_(201)的b极电阻R_(202)从MN15245的第(34)脚上焊开,接到外加的电位器(470kΩ)中间插头上,电位器的两端分
Example 1: Konka T920A color TV, the image is normal, the sound lost control. Check the microprocessor MN15245 found that the internal sound control circuit is damaged, the first (34) foot level signal out of control, switch T_ (201) on or off state also lost control and thus can not be changed ① TA7680 foot voltage, electronic volume control The device does not work. Emergency repair can be changed to manual manual control of electronic control, the specific method is: the switch T_ (201) of the b-pole resistor R_ (202) from the MN15245 (34) feet on the open welding, connected to the potentiometer 470kΩ) on the middle of the plug, the potentiometer of the two ends