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故障现象:重放数秒后自动停机保护。分析检修:本人对多台该类机器同样故障进行检修,发现均是由于该机设置的带盘旋转传感检测电路发生故障所引起的。该电路主要由收带盘下的光敏组件(型号为“1A”)与大板上的开关管Q_6组成,如图1。
Symptom: replay automatically shut down after a few seconds to protect. Analysis and maintenance: I am more than one of the same failure of such machines overhaul and found that are due to the machine set reel rotation sensing detection circuit malfunction caused. The circuit is mainly composed of a photosensitive component (type “1A”) under the take-up reel and a switch Q_6 on the large board, as shown in FIG. 1.