Hey Felipe Olivares!
I was looking at the guide for the [guide|3217|A1302 Airport Time Capsule|new_window=true] to see how they removed the power supply. After looking around for specific model information and checking the A1302 guide, I saw that Delta made the power supply. Not only did they make it, but they provided the model information on the power supply. I would suggest opening your A1409 Airport Time Capsule (if you haven't already) and seeing if the information you seek is available on the power supply.
Let us know if you are successful!