The work will take place between this Thursday (July 26) from 4pm BST (8am PT) through to Friday (July 27) at 8am BST (12am PT).
As with previous periods of downtime, the PlayStation Store, customer account management and user registration will be unavailable on PS3, PSP and Vita.
Users wishing to play online during the period must sign into PlayStation Network before maintenance begins.
Images of a new Super Slim PS3 were recently leaked online, which is now said to be missing its rumoured reveal at gamescom next month.
> Limbo was almost a PSN exclusive, says Sony
Photo gallery - alleged images of the PS3 Super Slim:
Copyright: Sony tecnoblog.net