论文部分内容阅读
例1 故障现象:装入带盒,按下重放键,有时几秒钟后便自动保护停机,按下任何操作功能键均不起作用;而有时却能正常工作。分析与抢修:为了判断故障范围,进一步检查其它功能,接通电源后,执行快进或倒带操作,结果经常性地在几秒钟后保护停机。由于在快进、倒带工作状态下,并不要鼓电机转动,所以怀疑故障是由带盘转动不良引起的。拆开上盖板,观察故障现象,发现在执行快进、倒带或重放工作方式时,带盘旋转顺畅,几秒钟后便停转,因此怀疑故障是由于收带盘旋转检测电路误动作所致。收带盘正常旋转时,由收带盘传感器输出一个连续的脉冲给系统控制微处理器,如果系统控制微处理
Example 1 Symptom: When the tape cartridge is loaded and the playback button is pressed, it sometimes protects the machine from shutting down after a few seconds. Pressing any operating function button will not work, and sometimes it will work normally. Analysis and repair: In order to determine the scope of the fault, further examination of other functions, the power supply, the implementation of fast forward or rewind operation, the result is often in a few seconds to protect downtime. As fast forward, rewind working state, and do not drum motor rotation, so I suspect that the failure is caused by poor rotation of the reel. The upper cover was disassembled to observe the failure phenomenon. It was found that when the fast-forwarding mode, the rewinding mode or the replay mode was performed, the reel rotation was smooth and stopped after a few seconds. Therefore, it was suspected that the failure was due to the failure of the reel detection circuit Action caused. Close the reel normal rotation, by the closing tape sensor output a continuous pulse to the system control microprocessor, if the system control micro-processing