Opening/closing the case

To open the case first make sure, that no heavy load is on the modules. Because this can lead to overheating when the top cover is removed.

First unscrew the M3 knurled screw (A) at the top back of the Antares. It may be necessary to pull the Antares out of the rack further than the rails allow. To to this pull the Antares out until the rails lock in place, and then use the levers to the left and right (as described in Rack mounting) to slide the Antares over the locking point. But don't pull to far, as the Antares could slip out of the rails!
Then slide the cover back (B) and carefully lift the cover so that the hooks don't get stuck and bend.

Place the cover onto the Antares so that the hooks fit into the holes in the chassis.
Then slide the cover to the front (B) while pushing the hooks downwards into the holes if they are stuck.
At last tighten the M3 knurled screw (A) at the top back of the Antares.

Fig. 1

Unscrew the 14 (six on top, eight on the sides; marked red below) M3 screws using a T8 Torx screwdriver and lift the cover.

Place the cover on top of the Arneb and check if the screwholes of the cover align with the ones in the chassis.
If this is not the case the cover is placed in the wrong direction. Tighten all 14 screws (marked red below) using a T8 Torx screwdriver.

Fig. 2: Cover screws (red circle); the four screws on the right side are not shown