Why does the printer keep beeping?

Please ensure that you are using the original power adapter/brick that came with the printer.

This normally happens if the printer is not connected to the original power adapter/brick that came with it. 

Please check if your power adapter is the one included in the package, as shown in the picture below.

The power adapter specification:

Input: 100-240V ≈ 50/60Hz 1.5A

Output: 24V ⎓ 2A 48W