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例1:每当推动调音台右声道主推拉电位器时,音箱总会发出“沙沙”声。分析与检修:根据故障现象分析,该故障可能是因调音台上右主控输出推拉电位器出现触点和炭膜磨损或因灰尘积累而接触不良所致。检修时,只要通过直接触摸和试听就可以确定出故障部位。这种故障比较多见,尤其是功率放大器上的音量电位器经长期使用也会有类似的故障出现。在一些高质量的调音台上,虽然其推拉电位器不采用炭膜
Example 1: The loudspeaker always emits a “rustling” sound whenever the mixer’s right channel push-pull potentiometer is pushed. Analysis and Maintenance: According to the analysis of the fault phenomenon, the fault may be caused by the mixer on the right master output push-pull potentiometer contacts and carbon film wear or due to dust accumulation and poor contact. Maintenance, as long as the direct touch and audition can determine the fault site. This kind of breakdown is more common, especially the volume potentiometer on the power amplifier will have a similar failure after long-term use. In some high-quality mixer, although its push-pull potentiometer does not use carbon film