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维修中碰到有以μP1263C2 IC作音频功放的收录机或随身听,出现一个声道正常,另一个声道无声的故障。经检查为μPC1263C2内部一个音频放大器有故障,检测第(11)、(12)、⑧脚电压异常。分析异常的原因有可能是内部偏置电路损坏引起,由于第(12)脚(反相输入端)电压过低(0V),使内部输出管一直处于饱和导通
Maintenance met with μP1263C2 IC for audio amplifier Shuntao or Walkman, there is a normal channel, the other channel silent fault. After checking for an internal audio amplifier μPC1263C2 fault, detection of (11), (12), ⑧ pin voltage anomalies. Analysis of abnormal causes may be caused by damage to the internal bias circuit, because the (12) feet (inverting input) voltage is too low (0V), so that the internal output tube has been saturated conduction