Remove the top screw and the one on the side which holds the cable
The press the notches on the connector and remove the cable
From the bottom remove the left screw and the screws for the fan duct.
THe fan duct can be then slided out - then remove the right screw.
Now the extruder can be remove from the top. To reach the belt holder.
It should look like this
The "good" version with a removable belt holder and the
BAD version where the belts are glued onto the carriage.
In case of the bad version you can remove the belts only destroying them Heat it up a bit and use force
The good version can be loosend reving the screws from the bottom:
Done ready to mount another carriage like the Ikarus.