How remove Sakura R-727II range hood to clean inside?
The installation manual appears to have all the information you will need to uninstall the hood for cleaning. Although I'm not sure why you would need to completely uninstall this hood in order to clean it.
However, if that's necessary just follow the installation instructions in reverse starting with removing the bottom panel to access the four mounting screws at the inside top of the hood. These screws have keyhole openings and only need to be loosened to slide the unit forward. Be sure to turn off the power before attempting to remove any electrical connections.