1. How to deal with the situation that the machine is silent and the screen has no display?
答：Check the battery for power. Please charge the machine.
2. How to deal with button failure?
答：Check whether the button is stuck and release the button.
3. How to deal with the distortion of sound?
答：The battery is low, please charge the machine in time.
4. How to deal with the situation of machine MP3 playing without sound?
答：① check whether the volume adjustment knob is turned on, and readjust the volume knob.
② check whether there is no MP3 file on the machine, and connect the computer to copy the MP3 file again.
③ check whether other non play keys are pressed by mistake, refer to the operation instructions and try again.
5. How to deal with the situation that the machine cannot download normally?
答：① check whether the USB connection cable is damaged and whether the connection method is correct. Replace the USB cable and correct the connection method
② check whether the disk capacity is insufficient. Delete redundant or useless files
