Complaint
| Fault phenomenon | Simple fault analysis | Troubleshooting |
| Failing to electrify | The power switch is not opened The electricity quantity of built-in battery is totally consumed | Open power switch Use power adaptor to charge the battery |
| No sound | Failing to input sound source Failing to establish signal line Main volume is switched to minimum U disk playing has no sound Faults with external signal source Poor contact or damage of external signal line | Change signal source Reconnect signal line Properly adjust the volume knob Inspect U disk or audio switch Change signal source Readjust or change signal line |
| External microphone has no sound | External microphone is not fully inserted in the jack The external microphone switch is not opened The volume knob of microphone is off | Totally insert the microphone to the jack Open the switch of wireless microphone Properly adjust the volume knob of microphone |
| Problems with wireless microphone | The switch of wireless microphone is not opened The wireless microphone is not inserted in the battery The sound of wireless microphone is in distortion | Open the switch of wireless microphone Insert electrical apparatus to the battery box of wireless microphone Change the battery of wireless microphone |
