公共广播音响设备安装好后，经过一段时间的使用，总会有一些小的问题需要解决，那么快速排除公共广播音响扩声系统故障方法有什么呢？
After the public address sound equipment is installed, after a period of use, there will always be some small problems to be solved. So what are the methods to quickly eliminate the faults of the public address sound reinforcement system?
直观检查法
Visual inspection method
直观检查法是断开电源后立即进行。不用仪器、仪表，凭直观的感觉，调动视觉、听觉、嗅觉、触觉等4种感觉特性，进行判断。这种检查方法虽然准确性较差些，但速度快，直观检查法尤其对电源故障检查很有用。
Visual inspection is performed immediately after disconnecting the power supply. Without instruments and meters, with intuitive feelings, we can mobilize the four sensory characteristics of vision, hearing, smell and touch to make judgments. Although this inspection method is less accurate, it is fast, and the visual inspection method is especially useful for power failure inspection.
一看:观察机器或部件及其外部结构。看按键开关、接口、指示灯有无松动，线路板接绪有无脱落，有无虚焊、变色、裂痕、爆裂等现象，保险丝有无烧断、打火、冒烟、变形、未卡住等问题，采用眼睛，直接识别和判断。
First look: observe the machine or component and its external structure. Check whether the key switch, interface and indicator light are loose, whether the wiring thread of the circuit board falls off, whether there is soldering, discoloration, crack, burst and other phenomena, and whether the fuse is burnt out, ignited, smoking, deformed, not stuck and other problems. Use eyes to directly identify and judge.
二听:轻轻翻动机器或部件，摇摆摇摆，听听有无零件散落或螺丝钉脱落情况，是否有碰击声。作连续翻转有无不正常的&濒诲辩耻辞;吱吱&谤诲辩耻辞;声或&濒诲辩耻辞;啪啪&谤诲辩耻辞;的打火声（通电时）。如果有这些现象，故障可能出现在这些地方。
Second, listen: gently turn the machine or parts, swing, listen to whether there are parts scattered or screws falling off, and whether there is a collision sound. Check whether there is abnormal "squeaking" sound or "popping" fire sound during continuous turnover (when powered on). If there are these phenomena, the fault may appear in these places.
叁闻:用鼻子闻闻有无烧焦气味，找到气味来源，故障可能出一放出异味的地方。
Three smells: smell with your nose for burning smell, find out the source of the smell, and the fault may be a place that emits peculiar smell.
四摸:用手摸摸变压器外壳（断电后进行），不要触及接线端子，因为有时因充电电容存在，电压甚高，危及。感觉一下，是否超过正常温度、发烫，无法触摸。功率管有无过热或冰凉现象。调整管有无过热或冰凉不热现象。如果有这些现象，问题可能出现在这些地方。
Four touch: touch the transformer shell by hand (after power failure), do not touch the wiring terminal, because sometimes the voltage is very high due to the existence of charging capacitance, which endangers safety. Feel whether it is beyond the normal temperature, hot and untouchable. Check whether the power tube is overheated or cold. Check whether the adjusting tube is overheated or cold. If there are these phenomena, the problems may appear in these places.
试探法
Heuristics
试探法是针对怀疑部分的电路采用比较、分割、替代、模拟等试探手段，寻找
山东公共广播音响扩声系统故障所在，然后排除。具体方法如下：
Heuristics is to use comparison, segmentation, substitution, simulation and other heuristics to find the fault of Shandong public broadcasting sound reinforcement system, and then eliminate it. The specific methods are as follows:
1、比较:找一台与故障机完全相同型号的机器，在设备中利用同一台机器的左、右声道部件，测量相对应部分的电压、电阻、电流数量，再加以比较，找到故障所在。
1. Comparison: find a machine with the same model as the faulty machine, use the left and right channel components of the same machine in professional equipment, measure the voltage, resistance and current of the corresponding parts, and then compare them to find the fault.
2、分割:将某部分电路与其他部分脱开，接上外加电源，注入信号，进行判断。
2. Division: disconnect a part of the circuit from other parts, connect the external power supply, inject the signal, and judge.
3、替代:用好的元件替代怀疑元件，或将左、右声道部件对换，尤其对于集成电路块可以这样进行。如果部件对换之后，机器恢复正常，则说明该部件存在问题或损坏。
3. Replacement: replace the suspected component with a good component, or replace the left and right channel components, especially for integrated circuit blocks. If the machine returns to normal after the parts are replaced, there is a problem or damage to the parts.
4、模拟:温度模拟，采用电吹风加热，或用酒精降温，进行温度性能检查，振动模拟是使用细的塑料绝缘棒轻击某些部件，看看电路工作状况，可以发现某些虚焊现象，检查故障所在。这种方法一般由技术熟练者进行，否则，容易出现故障加重现象。
4. Simulation: temperature simulation, using hair dryer heating, or cooling with alcohol, to check the temperature performance. Vibration simulation is to use a thin plastic insulating rod to tap some parts, look at the working condition of the circuit, you can find some false soldering phenomena, and check the fault. This method is generally carried out by skilled people, otherwise, it is easy to aggravate the fault.
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