How to judge and analyze when the public address system were in trouble ?
1.There is no electricity: check the power cord to check if the insurance tube is connected, or whether
the power line fault or insurance tube bad contact, insurance tube is burnt out, namely, check the
amplifier rectifier bridge rectifier or electrolysis components are bad, such as rectifier diode or bridge
rectifiers bad put on a good element to check other lines, such as power amplifier tube;
2.The signal level indicator is flashing normal, but no sound output: First of all,check the horn unit is
normal, if it is normal, then check horn lead normal, then check a good contact to the terminal, if it is
normal, open chassis visual or see output relay if it is attracted;
3.The power light indicates normal no sound output,but hear output relay voice, use universal meter
measuring to check if the power supply of power amplifier is normal,if it is normal ,that is the signal
input end of the signal terminals with thread and hand pass like hear loud current namely preliminary
discriminant power amplification of some of the basic normal.That is, the light signal of the signal can
not be or contact with the poor, such as poor contact, that is, the use of universal table measurement is the root of the line is normal;
4.Power amplifier output no sound output, to check if the speaker unit is normal ,if the terminal is not in contact with the poor and cause burning, if it is the terminal burning black, that is to clean up and
ensure normal contact, tighten the screws;
5.The protection lights on when open the equipment: first using the multimeter measurement to check whether the horn group is a short circuit or not, the resistance is reduced (normal is not less than 30
ohms) such as machine line resistance normal, namely discriminant power amplifier machine fault,
that is to start checking.
Kerry
Luo
Dongchuang
International Industrial Limited
Add:
No1 Gonghe Road,Shaxi Huangqi,Nanhai,Foshan,Guangdong,CHINA
Tel:
86-757-88773347
Email: dongchuangyp001@126.com
Skype:dongchuangyp001
Wechat:
LYY112126
QQ: 2850632517
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