山東公共廣播音響系統在使用的時候難免會出現大大小小的問題，這個時候我們就要及時尋找原因然后抓緊時間解決掉，不然小問題也得拖延成為大問題，下面小編給您講解常見問題。
It is inevitable that Shandong public address sound system will have large and small problems when it is used. At this time, we should find out the reasons in time and solve them as soon as possible. Otherwise, small problems will also become big problems. The following sections will explain common problems to you.
線性輸入信號源
Linear input signal source
檢查方法：
Inspection method:
將前置放大器或者調音臺的線路輸入信號源，如電腦、DVD、調諧器等，依次拔掉然后檢查噪音是否消失，然后判斷噪音是哪路信號源引入系統的；一般線性輸入信號源引入噪音可能較少，有的話一般是電腦或者調諧器造成的。
Input the line of the preamplifier or the mixer into the signal source, such as the computer, DVD, tuner, etc., unplug them in turn, check whether the noise disappears, and then determine which signal source the noise is introduced into the system; Generally, the noise introduced by linear input signal source may be less, and sometimes it is generally caused by computer or tuner.
解決方案：
Solution:
將電腦的電源與前置功放取到同一個插座，或者更換其它電腦或者筆記本測試，一般是電腦和前置放大器之間有電位差導致的噪音，中間接音頻隔離器有可能會有所好轉。或者將電腦和前置放大器等公用一個電源，或將電腦電源地線去掉。
Take the power supply of the computer and the preamplifier to the same socket, or replace another computer or laptop for testing. Generally, there is a noise caused by potential difference between the computer and the preamplifier, and the intermediate audio isolator may be improved. Or the computer and preamplifier can share a power supply, or the computer power ground wire can be removed.
調諧器引入噪音一般是調諧器電源打開了，而且接收信號不好造成噪音出現，將調諧器電源關閉即可，如要使用調諧器根據效果可增加室外天線解決接收信號弱的問題。
In general, the tuner power is turned on to introduce noise, and the noise is caused by poor reception signal. Turn off the tuner power. If you want to use the tuner, you can add an outdoor antenna according to the effect to solve the problem of weak reception signal.
話筒輸入信號源
Microphone input signal source
檢查方法：
Inspection method:
將話筒信號輸入線依次拔掉，如有線話筒或者無線話筒等；然后檢查音箱是否還有噪音，判斷噪音是哪一路話筒引入系統的；
Unplug the microphone signal input line in turn, such as wired microphone or wireless microphone; Then check whether there is any noise in the speaker, and determine which microphone is introduced into the system;
解決方案：
Solution:
無線話筒引入，有可能是無線話筒的使用頻段有干擾造成噪音，如果無線話筒能夠調整頻率的話，調整頻率測試；
The introduction of wireless microphone may be caused by interference in the frequency band of wireless microphone. If the wireless microphone can adjust the frequency, adjust the frequency test;
也可能是接收機接地不好造成的噪音，如果接收機固定到機柜了也有可能造成噪音，將接收機從機柜拆下，與機柜隔離測試檢查噪音是否消失。如果消失的話，將接收機墊紙或者泡沫，放到其他設備或者托盤上。
It may also be the noise caused by poor grounding of the receiver. If the receiver is fixed to the cabinet, it may also cause noise. Remove the receiver from the cabinet and test whether the noise disappears after isolation from the cabinet. If it disappears, put the receiver pad paper or foam on other equipment or tray.
有線話筒引入，一般是有線話筒線過長（四五十米及以上）引起的，更換短話筒線測試，長有線話筒線引入的噪音一般不好處理，長話筒線鋪設的時候一般要求使用質量好的RVVP（兩芯帶屏蔽）線纜，在話筒線與前置放大器之間增加音頻隔離器有可能會有幫助。
The introduction of wired microphone is generally caused by the long wired microphone cable (40 to 50 meters and above). Replace the short microphone cable for testing. The noise introduced by the long wired microphone cable is generally difficult to deal with. When laying the long microphone cable, it is generally required to use the RVVP (two core tape shield) cable with good quality. It may be helpful to add an audio isolator between the microphone cable and the preamplifier.
功放或者前置放大器
Power amplifier or preamplifier
檢查方法：
Inspection method:
在不接入音源的情況下，也就是說前置放大器沒有任何輸入信號源，前置放大器與功放之間只有一根信號線，
When the sound source is not connected, that is to say, the preamplifier does not have any input signal source, and there is only one signal line between the preamplifier and the power amplifier,
如果還有噪音，將線拔掉，檢查音箱是否還有噪音。
If there is still noise, unplug the cable and check whether there is still noise in the speaker.
解決方案：
Solution:
如果噪音消失，那問題出在前置放大器上，如果有其他的前置放大器代替測試一下，發回前置放大器維修或者更換備用機。
If the noise disappears, the problem lies in the preamplifier. If another preamplifier replaces the test, send it back to the preamplifier for maintenance or replacement.
如果還有噪音，那問題出在功放上，如果有其他功放代替測試，有問題功放發回公司維修或者更換備用機。
If there is still noise, the problem is the power amplifier. If there is another power amplifier to replace the test, the faulty power amplifier will be sent back to the company for maintenance or replacement.
This is the end of the FAQ of the public address system. If you don't know anything about it, please come to our website http://www.zkvd.cn Ask about it!
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