◪ 1. Loading too large,the amplifier is hot for a long time.
◪2. The power supply voltage is too high, capacitor was burned, amplifier tube was burned, or transformer and other components.
◪3. Lightning, the current is too large, it can also lead to damage to the PA equipment, such as 8200 it will be better to work with lightning arrester.
◪4. Wrong operation.
◪5. Logistics transport or man-made fall.
◪6. The 100V output directly to the audio input port.
