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故障现象:一台长城JTC-471型47厘米彩电,图象正常,音量小。分析与检修:测量伴音块IC601 D7243P各引脚电压正常,从⑥脚送入感应信号,喇叭“嗡嗡”响,证明音频功放正常。⑥脚输入端有二路输入,一路是6.5MHz检波后伴音音频信号,由④脚输出通过C609、C608耦合到⑥脚,另一路是Q 690频道转换消声抑制电路,通过C608耦合到⑥脚。
Symptoms: A Great Wall JTC-471 47 cm color TV, the image is normal, the volume is small. Analysis and Overhaul: Measuring the sound block IC601 D7243P each pin voltage is normal, from the ⑥ feet into the induction signal, the speaker “buzzing” ring to prove the normal audio amplifier. ⑥ pin input with two inputs, all the way is 6.5MHz after detection sound audio signal from the ④ pin output through the C609, C608 coupled to the ⑥ foot, and the other is the Q 690 channel conversion muffler suppression circuit, coupled to the C608 feet .