1. Unplug the device from the USB port and manually push the discharge tube to the bottom
Then plug the device into the USB port of the machine. Will the discharge pipe return to the top?
https://drive.google.com/file/d/1UGREehW52LDf7L5Jtp54a8rkOQ6gS4Wn/view?usp=sharing
2. Remove the cover on the device and check whether the motor gear inside is stuck by wires or other foreign objects.