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弱电在平时的工作和生活中经常会接触到，像门禁系统，网络系统，电话交换机系统，广播系统等等，了解和熟悉一定的弱电基础知识对于电力维护作业是十分有必要的。下面例举了弱电系统中的5个小分支系统的架构和故障处理方法。
一，公共广播系统。
2，磁力锁系统。
3，红外线报警系统。
四，电话交换机系统。
五，监控系统。
1，蓝屏故障及解决方法。
2，黑屏故障和解决方法。
3，不清晰故障及解决方法。