Universal Robots UR3 Service Manual page 80

5. Service and Replacement of Parts
1. Remove teach pendent cable – see previous section
2. Disconnect all the marked wires from the SCB.
3. Remove the 4 nuts (M6) in the top and bottom of controller module.
4. Gently take out the controller module from the controller box.
5. Turn the module 90° counterclockwise and place it on the controller edge.
UR3 74 Service Manual