Ultimaker UM2 Assembly Manual page 65

3.
Attach the Hot-end Fan to the connector
in the middle of the electronics.
4. Check if the jumpers are attached
at the SAFETY1 en SAFETY2. if not,
attach them.
5. Now from the inside put the
4xM3x30mm screws through the
bottom plate. these will be used to
secure the electronics.
65