The PDC2 deconstruction device in The Lumina, Crown Mines, is a huge ship, which you can find to the east of the map. To reach it you will have to climb on the back of the ship. To get to the top, you can fly and then climb the walls.
Head to the top floor of the ship and you can find the device in front of the red metal frame. Diamond shaped with an orange glow on top and a reddish orange underside.
To find the password you will have to find abandoned servers all over the ship. 7268 is the password, so you will have to interact with the device and press the buttons on the right of the panel to add it.
Opening it will allow you to claim the Golden Nucleus, with which you can purchase special orders to mine random characters.
This is all you need to know about where to find the PDC2 password in Tower of Fantasy, so we hope we have been very helpful in getting this password quickly.