⑴公共广播设备功放机器无电：检查电源线保险管是否通，是否电源线断或保险管接触不良，保险管烧断&谤补谤谤;即检查功放整流电源的整流桥或电解等元器件是否坏，如整流二极管或桥堆坏换上好的元件再检查其它线路，例如功率放大管等。
(1) the power amplifier of public address equipment has no power: check whether the power line is connected to the fuse tube, whether the power line is broken or the fuse tube is in poor contact, and whether the fuse tube is burnt out → that is, check whether the rectifier bridge or electrolysis and other components of the rectifier power supply of the power amplifier are broken. If the rectifier diode or bridge stack is broken, replace it with good components, and then check other lines, such as power amplifier tube, etc.
⑵公共广播设备功放机器信号电平指示灯闪烁正常，但无声音输出：先检查喇叭单元是否正常，如正常，即检查喇叭引线正常，即检查接线端接触良好，正常，即开机箱目测或耳听有无听到或看到输出继电器是否吸合，如果吸合正常，（如有表）即测量继电器的前输入端与输出端是否直通，如不通即继电器内的触点氧化或打火造成绩炭，即换继电器正常。
(2) the signal level indicator of the power amplifier of public address equipment flashes normally, but there is no sound output: first check whether the horn unit is normal. If it is normal, check whether the horn lead is normal, that is, check whether the terminal contact is good and normal, that is, open the chassis and visually check whether the output relay is heard or seen. If it is normal, (if there is a universal meter), that is, measure whether the front input end and output end of the relay are connected directly. If they are not connected, that is, the contact in the relay is oxidized or ignited, resulting in carbon loss, that is, the relay is replaced normally.
⑶公共广播设备功放机器电源灯指示正常无声音输出，但听到输出继电器吸合声：先用表测量功率放大器的供电电源是否正常，如正常，即信号输入端的信号线端子处用线头与手通如听到很大的电流声即初步判别功率放大部分基本正常，即轻摇动信号引线是否有不能或接触不良，如是接触不良，即用表测量是那根线有故障处理正常。广播系统建议你选择 KNAYD公司有保证。
(3) the power light of the power amplifier of public address equipment indicates that there is no sound output, but the pull-in sound of the output relay is heard: first measure whether the power supply of the power amplifier is normal with a universal meter. If it is normal, the wire head is connected with the hand at the signal line terminal of the signal input end. If a large current sound is heard, it is preliminarily judged that the power amplification part is basically normal, That is, gently shake the signal lead to see if there is failure or poor contact. In case of poor contact, use a multimeter to measure if there is a fault in that wire, and handle it normally. The broadcasting system suggests you choose knayd brand, which is guaranteed.
⑷如功率放大器输出时无声音输出:即检查喇叭单元是正常,如接线端子有无接触不良而造成烧焦,如果是接线端子烧黑,即清理而保证接触正常,拧紧固螺丝.
(4) if there is no sound output when the power amplifier outputs: check whether the horn unit is normal. If the wiring terminal is burnt due to poor contact, if the wiring terminal is burnt black, clean it to ensure normal contact, and screw down the fastening screw
⑸公共广播设备功放机器开机保护灯亮:用表测量喇叭群是否有短路,电阻是否降低(一般正常为不小于30&翱尘别驳补;)如机外线路阻值正常,即判别为功放机有故障,即要开机检查。
(5) power on protection light of public address equipment power amplifier is on: first, use a universal meter to measure whether there is a short circuit in the horn group and whether the resistance decreases (generally not less than 30 Ω). If the resistance value of the external line is normal, it is judged that the power amplifier is faulty, and the power amplifier should be started for inspection.
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