一、录放音电路故障(一)放音时无信号输入,本底噪声大.这大都由于前置均放电路IC-4损坏所致.IG-4(TA7328AP)输入端与信号源直接耦合,此信号源的电平直接影响集成电路的工作状态.录音时,特别是作线路输入录音时,若信号源电平过高或带有直流成分,均可能使集成电路TA7328AP受到损害.TA7328AP受损后会产生录放音失真、音轻、噪声大等故障现象.有时TA7328AP因静态电流较大而发生较大的本底噪声.对于以上故障,均应更换TA7328AP.有时,噪声频率较低,处于放音频带的下限,最高噪音电平对应频率 First, the recording and playback circuit failure (A) no signal input during playback, the background noise is large, which are mostly due to damage caused by the front-all discharge circuit IC-4IG-4 (TA7328AP) input and signal source directly coupled, The level of this signal source directly affects the operating status of the integrated circuit. During recording, especially for line input recording, the integrated circuit TA7328AP may be damaged if the signal level is too high or with a DC component. The TA7328AP is damaged After the recording and playback will produce distortion, light tone, noise and other symptoms.Often TA7328AP larger quiescent current and larger noise floor.For these failures, should be replaced TA7328AP.Often, the noise frequency is low, in the release The lower limit of the audio band, the highest noise level corresponds to the frequency