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二、故障检修实例例一机型:AD—280卡拉OK机故障现象:音乐信号正常,但话筒无输出,无混响且开大混响钮会出现自激啸叫现象。检修:此类故障一般是因在延时集成电路外接的存储器失去作用而引起的。AD—280机采用三菱公司产的M50195作为延时混响处理,其外接存储器型号为4164。经验性判断4164存储器好坏的方法:关掉混响钮后,若啸叫声完全消失,则可以确定4164损坏。一般更换4164块后,均会故障排除。例二机型:AD—680卡拉OK机故障现象:音乐信号完全正常,而话筒输入无声。检修:此类故障可以确定故障出在话筒相关电路中,可先查话筒放大器电路(电原理图如图2所示)。若
Second, the troubleshooting example Example 1 model: AD-280 Kara OK machine Fault phenomenon: the music signal is normal, but no microphone output, no reverberation and open reverb button will appear self-excited howling phenomenon. Overhaul: Such failures are generally caused by the loss of function in the external memory of the delay IC. AD-280 machine Mitsubishi M50195 produced by the delay as a reverberation, the external memory model 4164. How to Make a Judgment on the 4164 Memory: After the reverb button is turned off, if the howling disappears completely, you can determine 4164 corruption. After the general replacement of 4164, will be troubleshooting. Example II Model: AD-680 Kara OK machine Trouble phenomenon: The music signal is completely normal, and the microphone input is silent. Overhaul: Such failures can determine the fault out of the microphone-related circuits, you can check the microphone amplifier circuit (electrical schematic shown in Figure 2). If